10.Optics

10 Light

Which one of the following types of waves are used in a night vision apparatus?

which-one-of-the-following-types-of-waves-are-used-in-a-night-vision-apparatus
Question: The nature of radiation of light is- ( 42nd BPSC (pre) 1997-98 )

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Question: Which of the following statements is true ? ( UP Lower Sub. (pre) 2002 )

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Question: The visible range of solar radiation is- ( 53rd to 55th BPSC (pre) 2011 )

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Question: Which of the following radiation has the highest energy per quantum ? ( Utt PCS (pre)2012 )

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Light can not pass through:

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Question: The wave length extension of visible light is- ( UP PCS (mains) 2005 )

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What do you mean by word "Rectilinear propagation of Light".

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Which among the following is luminous body?

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Question

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When shadow is formed by a light source smaller than the object by an opaque object two patches of shadow is seen. The inner patch is completely dark. This completely dark portion is of a shadow is called:

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Question: Which of the following statement is not correct ? ( UP RO/ARO. (pre) 2021 )

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Question:

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Question: Among the colours mentioned below, the eye is most sensitive to colours between : ( UP PCS (mains) 2008 )

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Question

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Question: Light appears to travel in a straight line because- ( UP PSC (R.I) 2014 )

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Question: The speed of light in air depends on: ( Jharkhand PCS (pre) 2021 )

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Question: The speed of light will be minimum while passing through- ( IAS (pre) 1994 ), 67th BPSC (pre) (Re. Exam) 2022 )

question-the-speed-of-light-will-be-minimum-while-passing-through-ias-pre-1994-67th-bpsc-pre-re-exam-2022
Question: Light travels at a maximum speed in : ( Utt. PCS (pre) 2021 )

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Question: The time taken to reach the Sunlight up to the surface of earth is approximately - ( 42nd BPSC (pre) 1997 )

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Question: Velocity of light is maximum in - ( UP PSC (RI) 2014 )

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Question: What is he reason behind the extra ordinary shining of the diamond cuts in a proper way ? ( IAS (pre) 1994 )

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Question: The diamond appears lustrous because of : ( UP PCS. (Mains) 2012 ), UP PCS (pre) 1996 )

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Question: The formation of glittering colours in thin foam of soap is the result of which of the following phenomenon- ( IAS (pre) 1993 )

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Question: A cut diamond shines brilliantly due to ( UP PCS (pre) 2017 ), UP PCS (mains) 2015 )

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Question: When a ray of light travels from a denser medium to a rarer medium then ( Chhattisgarh PCS (pre) 2018 )

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Why we can not see shadow of bird flying in the air?

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Question: When light passes from one medium to another medium, which one of the followings does not change : ( UP PCS (mains) 2003 )

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Question: Which of the following does not change when light travels from one medium to another ? ( 66th BPSC (pre) 2020 )

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The image formed by the pin hole camera is always

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Question: Which of the following has the highest velocity ? ( UP PCS (pre) 2018 )

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Question: Total internal reflection can take place when light travels from : ( IAS (pre) 1996 )

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Question: When light waves pass from air to glass the variable affected are- ( IAS (pre) 2001 )

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Question: The sunlight from the sun to the earth reaches in : ( 65th BPSC (pre) 2019 )

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Question: Light from the sun reaches Earth in about : ( UP PCS (mains) 2006 )

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Question: Which of the following is used to take 3-dimensional pictures - ( UP PCS (mains) 2008 ), UP PCS. (pre) 1990 )

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Question: Which one of the following reflects back more sunlight as compared to other three ? ( UP PCS (pre) 2021 )

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Question: Optical fibre works on the principle of : ( UP UDA/LDA (pre) 2010, UP PCS (spl.) (pre) 2008, IAS (pre) 1995 )

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Question: Consider the following statements : 1. Fibre optics is based on the principle of total internal reflection. 2. In an optical fibre communication system, power consumption is extremely low. 3. Optical fibre communications are free from radio frequency interference. 4. In India, Reliance Group of Industries is engaged in the manufacture of the optical fibre. Which of these statements are correct : ( UP UDA/LDA. (pre) 2002, UP PCS (pre) 2003, UP PCS (pre) 2001 )

question-consider-the-following-statements-1-fibre-optics-is-based-on-the-principle-of-total-internal-reflection-2-in-an-optical-fibre-communication-system-power-consumption-is-extremely-low-3-optical-fibre-communications-are-free-from-radio-frequency-interference-4-in-india-reliance-group-of-industries-is-engaged-in-the-manufacture-of-the-optical-fibre-which-of-these-statements-are-correct-up-uda-lda-pre-2002-up-pcs-pre-2003-up-pcs-pre-2001
Question: The phenomenon used in optical fiber for transmission of light energy is ( UP PCS (pre) 2019 )

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Which one of the Statement is not wrong?

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Question: Given below are two statements, one labelled as Assertion (A) and other labelled as Reason (R) : Assertion (A) : A diamond sparkles more than a glass imitation cut to the same shape. Reason (R) : The refractive index of diamond is less than that of glass. In the context of the above two statements, which one of the following is correct ? ( IAS (pre)1995 )

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Which of the statement regarding ZERO SHADOW DAY is correct?

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Have you ever seen glow worm shining in night? Glow worm produces light through

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Question: The generating images on a screen by focusing an electronic beam on phosphorus coated screen is called - ( RAS/RTS (pre) 1994-95 )

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Question: The technique to integrate and mark the image of a three-dimensional object is ( RAS/RTS (pre) 1999 ), RAS/RTS (pre) 1996 )

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Question: Consider the following natural phenomena : 1. Terrestrial heating 2. Reflection of light 3. Refraction of light 4. Diffraction of light Due to which of these phenomena is mirage formed ? ( IAS (pre) 2002 )

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Question: The reason of mirage is - ( UP PCS (pre) 2012 )

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If the angle of incidence is 30 degree, then what is the angle between the incident ray and reflected ray?

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Question: Mirage formation is an example of - ( UP PCS (mains) 2014 ), UP UDA/LDA (pre) 2013 )

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Question: An endoscope is used by a physician to view the internal parts of a body organ. It is based on the principle of- ( UP PCS (pre) 2010, UP PCS (mains) 2009, UP PCS (Spl) (mains) 2008, IAS (pre) 1999 )

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Question: Which one of the following phenomenon is used in optical fibres ? ( UP PCS (mains) 2015 )

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Question: In fibre-optic communication, the signal travels in the form of- ( RAS/RTS (pre) 2012 )

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Question: 'Endoscope' used by the doctors for examining the inside of patient's stomach, works on the principle of- (UP Lower Sub (pre) 2009 )

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Question: for reproducing sound, a CD (Compact Disc) audio player uses a : ( IAS (pre) 2000)

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Question: Direct viewing of Sun during total solar eclipse causes irreversible damage to eyes. The retinal burn is caused by which one of the following components of the sun rays ? ( UP PCS (mains) 2003 )

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Question: The colour of the star is an indication of its : ( UP PCS (mains) 2008 ), UP PCS (pre) 2005 ), UP PCS (mains) 2003 )

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Question: The principle reason why it is better to have two eyes than one is that : ( RAS/RTS (pre) 1994-95 )

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Question: Assertion (A) : In a motion picture, usually 24 frames are projected every second over the whole length of the film. Reason (R) : An image formed on the retina of eye persists for about 0.1s after the removal of the stimulus. (IAS (pre) 2000)

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Question: Which type of image of an object is formed by eye lens of the retina ? ( Chhattisgarh PCS (pre) 2015 )

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Question: In human eye, light rays get transformed into neural impulses at : ( UP PCS (pre) 1997 )

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Question: The image formed on Retina is: ( UP PCS (spl) (mains) 2004 ), (UP PCS (pre) 1995 )

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Question: Diffusion of light in the atmosphere takes place due to: ( IAS (pre) 2003 ), (UP PCS (pre) 2021 )

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Question: Television signals cannot be received beyond a certain distance because : ( UP PSC (GIC) 2010 ), (UP PCS (pre) 1994 )

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Question: The technique used to transmit audio signals in television broadcasts is : ( UP PCS (mains) 2007 ), ( IAS (pre) 1995 )

question-the-technique-used-to-transmit-audio-signals-in-television-broadcasts-is-up-pcs-mains-2007-ias-pre-1995
In day, Sun light falls an ground, even though you experience light in your room too. This light is due to

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Question: Consider the following statements : ( IAS (pre) 2002 ) 1. Light of longer wavelength is scattered much more than the light of shorter wavelength. 2. The speed of visible light in water is 0.95 times the speed in vacuum. 3. Radio waves are produced by rapidly oscillating electrical currents. 4. To detect the over speeding vehicles, police use the Doppler effect of reflected short radio waves. Which of these statements are correct ? ( IAS (pre) 2002 )

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Question: When a CD (compact disc used in audio and video system ) is seen in sunlight, rainbow-like colours is seen. This can be explained on the basis of the phenomenon of : ( IAS (pre) 2000 )

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Question: 'Raman effect' deals with the light rays passing through (RAS/RTS (pre) 1992)

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A class teacher teaches students, explaining the difference between Real Image and virtual image in three points: Point X = A real image is formed due to actual intersection of the reflected rays while a virtual image is formed when there reflected ray meat it they are porduced back wards. Point Y = A real image can be obtained on a screen while a virtual image can not be obtained on a screen. Point Z = A real image is inverted with respect to the object while virtual image is erect with respect to the object. Among above 3, which point is not 100% correct in all conditions

a-class-teracher-teaches-students-explaining-the-difference-between-real-image-and-virtual-image-in-three-points-ponit-x-a-real-image-is-formed-due-to-actual-intersection-of-the-reflceted-rays-while-a-virtual-image-is-formed-when-there-reflected-ray-meat-it-they-are-porduced-back-wards-point-y-a-real-image-can-be-obtained-on-a-sereen-while-a-virtual-image-can-not-be-obtained-on-a-screen-point-z-a-real-image-is-inverted-with-respect-to-the-object-while-virtual-image-is-erect-with-respect-to-the-object-among-above-3-which-point-is-not-100-correct-in-all-conditions
An object X is kept 100 cm in front of plane mirror M, it the mirror is now moved 25 cm towards the mirror, What is now distance between image and object X?

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When there is great hot in summer in desert, a water image is formed due to

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Question: Which one of the colours has the longest wavelength ? ( MP PCS (pre) 1997 )

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The image formed by a plane mirror is

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Question: The light with the shortest wavelength is (Utt PCS (pre) 2005 )

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Question: Red light signal is used as a danger signal because- ( UP PCS (mains) 2008 ), UP PCS (pre) 1995, UP PCS (mains) 2011, UP PCS (mains) 2005 )

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Question: Red light is used in traffic signals because : ( UP PCS (mains) 2013 )

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Question: Choose the correct statements. ( 64th BPSC (pre) 2018 )

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Question: The colour of light is determined by its ( UP PCS (mains) 2014 )

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Question: Twinkling of stars in clear sky during night time can be explained with : ( 67th BPSC (pre) 2022 )

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An object is in between two parallel plane mirror. Though indefinite image is formed but intensity of image decreases. This is due to

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Question: Assertion (A) : In the visible spectrum of light, red light is more energetic than green light. Reason (R) : The wavelength of red light is more than that of green light. ( IAS (pre) 2008 )

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Question: Which one among the following has the highest energy ? ( IAS (pre) 2009 )

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Question: In the visible spectrum, the colour having the shortest wavelength is : ( UP RO/ARO (mains) 2014 )

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Question: Assertion (A) : The danger signal is made up of red colour. Reason (R) : Red colour is scattered the least. Select the correct answer using the codes given below : ( UP PCS (pre) 2007 )

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Question: The Sun and Moon appear elliptical near the horizon because of : ( UP PCS (Spl.) (pre) 2008 )

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Question: Which one of the following colours of white light is least deviated by the glass prism ? ( UP RO/ARO (pre) (Re. Exam ) 2016 )

question-which-one-of-the-following-colours-of-white-light-is-least-deviated-by-the-glass-prism-up-ro-aro-pre-re-exam-2016
Question: Diffusion of light in the atmosphere takes place due to ( Jharkhand PCS (pre) 2013 )

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Question: The Sun is visible to us a few minutes before the actual sunrise because of : ( RAS / RTS (pre) 2007 )

question-the-sun-is-visible-to-us-a-few-minutes-before-the-actual-sunrise-because-of-ras-rts-pre-2007
Question: The sky appears blue due to - ( UP UDA /LDA (pre) 2013 )

question-the-sky-appears-blue-due-to-up-uda-lda-pre-2013
Question: What will be the nature of image formed by a convex mirror when the position of object is between infinity and pole P of the mirror ? ( Chhattisgarh PCS (pre) 2020 )

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In periscope the angle between two plane mirror is

in-periscope-the-angle-between-two-plane-mirror-is
Question: Suppose a rocket ship is proceeding from the earth at a speed of 2/10th the velocity of light. A light in the rocket ship appears blue to the passengers on the ship. What colour would it appear to an observer on the Earth ? ( IAS (pre) 1995 )

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Question: When we see the sky from a plane in high altitude, then it seems- ( UP PSC. (RI) 2014 )

question-when-we-see-the-sky-from-a-plane-in-high-altitude-then-it-seems-up-psc-ri-2014
Question: The red colour of the Sun at sunset and sunrise is due to- (UP PCS (mains) 2013 ), ( UP PCS (pre) 1992 )

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Question: Sea seems blue due to- ( 40th BPSC (pre) 1995 )

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Look at the following concave mirror: An object is placed at focus. The image formation will be

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Question: Blue colour of the sky is due to- ( UP PCS (pre) (Re. Exam) 2015 )

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An object is beyond the curvature c. It is concave mirror. The image so formed is

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In case of a concave mirror, a virtual image is formed only when an object is placed at

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Look at the following figure: Image by con cave mirror The below image is formed is at focus and nature of image is real, inverted and highly diminished. The said image is formed when object is at

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Look at the following convex mirror : The image, by object at any position in front of mirror is always behind the mirror, between P and F and smaller. Nature of image formed by convex mirror is always.

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Look at the following image formation by concave mirror: The image formed is real, inverted and of same size as of the object. Then the object is at X is at

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A car driver uses this mirror for the rear view

a-car-driver-uses-this-mirror-for-the-rear-view
A coin in water, seems to be at raised position than the actual.

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Which colour shows maximum deviation when light is dispersed through prism ?

which-colour-shows-maximum-deviation-when-light-is-dispersed-through-prism
Look at the following statement "Twinkling of stars at night:- The refractive index of air layers keeps on changing due to wind and convection currents there by changing the apparent position of the stars and hence they appear to be twinkling ". The statement regarding twinkling of star is

look-at-the-following-statement-twinkling-of-stars-at-night-the-refractive-index-of-air-layers-keeps-on-changing-due-to-wind-and-convertion-currents-there-by-changing-the-apparent-position-of-the-stars-and-hence-they-appear-to-be-twinkling-the-statement-regarding-twinkling-of-star-is
Look at the following statement: "Red colour has longest wave length hence red colour is scattered least in atmosphere hence in signals Red colour is used". This statement is

look-at-the-following-statement-red-colour-has-longest-wave-length-hence-red-colour-is-scattered-least-in-atmosphere-hence-in-signals-rad-colour-is-used-this-statment-is
Why the colour of sky is blue?

why-the-colour-of-sky-is-blue
Why sun is red at the time of sunrise and sun set?

why-sun-is-red-at-the-time-of-sunrise-and-sun-set
The band of seven colours of light is called spectrum. The seven colours of spectrum in order are

band-of-seven-colours-of-light-is-called-spectrum-the-seven-colours-of-spectrum-in-order-are
In a prism, the deviation of incident ray remain unaffected by

in-a-prism-the-deviation-of-incident-ray-remain-unaffected-by
In the given figure ox is : In the given figure ox is

look-at-the-following-figurein-the-given-figure-ox-is
Question: When a soap film on the water is seen in the daytime, it shows beautiful colours. This phenomenon is due to : ( 67th BPSC (pre) 2022 )

question-when-a-soap-film-on-the-water-is-seen-in-the-daytime-it-shows-beautiful-colours-this-phenomenon-is-due-to-67th-bpsc-pre-2022
Question: The (Green) Grass appears green to us because : ( UP PCS (mains) 2017)

question-the-green-grass-appears-green-to-us-because-up-pcs-mains-2017
Look at the following figure: "The image is real, diminished, inverted, formed between F and 2F on the other side of lens." Said image is formed when object is at

look-at-the-following-figure
Question: Sky is blue because - ( Utt PCS (pre) 2005 ), UP Lower Sub (pre) 1998 ), 39th BPSC (pre) 1994 )

question-sky-is-blue-because-utt-pcs-pre-2005-up-lower-sub-pre-1998-39th-bpsc-pre-1994
Question: Th sky appears blue due to - ( UP PCS (Mains) 2011)

question-th-sky-appears-blue-due-to-up-pcs-mains-2011
Question: An astronaut sees the colours of the sky as- ( UP PCS (mains) 2005 )

question-an-astronaut-sees-the-colours-of-the-sky-as-up-pcs-mains-2005
Question : ( Consider the following statements : 1. The sky appears blue because of scattering. 2. The main cause of seven colours of the rainbow is scattering of light. 3. At the time of sunrise, the sun appears red, due to scattering of light. Choose the correct statement/s from the given options : ( Utt UDA/LDA (pre) 2003 )

question-consider-the-following-statements-1-the-sky-appears-blue-because-of-scattering-2-the-main-cause-of-seven-colours-of-the-rainbow-is-scattering-of-light-3-at-the-time-of-sunrise-the-sun-appears-red-due-to-scattering-of-light-choose-the-correct-statement-s-from-the-given-options-utt-uda-lda-pre-2003
Question: In driving a car which type of mirror would you like to use for observing traffic at your back ? ( Utt PCS (pre) 2005 ), (UP PCS (pre) 1991 )

question-in-driving-a-car-which-type-of-mirror-would-you-like-to-use-for-observing-traffic-at-your-back-utt-pcs-pre-2005-up-pcs-pre-1991
Question: Light is made of seven colours. What is the method of separating the colours ? ( 47th BPSC (pre) 2005 )

question-light-is-made-of-seven-colours-what-is-the-method-of-separating-the-colours-47th-bpsc-pre-2005
Question

question
Question: For shaving, one uses- ( 43rd BPSC. (pre) 1999 )

question-for-shaving-one-uses-43rd-bpsc-pre-1999
Look at the following figure:"The image is real, Same size as object, inverted, formed at 2f on the other side. Such image is formed when object is at

look-at-the-following-figurethe-image-is-real-same-size-as-object-inverted-formed-at-2f-on-the-other-side-such-image-is-formed-when-object-is-at
Question: Assertion (A) : Small glass beads fixed on traffic signals glow brightly when light falls upon them. Reason (R) : Light is totally reflected when the angle of incidence exceeds a certain critical value and light travelling in a denser medium is reflected from a rarer medium. ( IAS (pre) 2000 )

question-assertion-a-small-glass-beads-fixed-on-traffic-signals-glow-brightly-when-light-falls-upon-them-reason-r-light-is-totally-reflected-when-the-angle-of-incidence-exceeds-a-certain-critical-value-and-light-travelling-in-a-denser-medium-is-reflected-from-a-rarer-medium-ias-pre-2000
Question: Which one of the following types of the mirror is used to see the traffic behind the car ? ( UP PCS (pre) 2015 )

question-which-one-of-the-following-types-of-the-mirror-is-used-to-see-the-traffic-behind-the-car-up-pcs-pre-2015
Question: A dentist mirror is a - ( UP PCS (mains) 2009 )

question-a-dentist-mirror-is-a-up-pcs-mains-2009
Look at the following figure: "The image formed is real, magnified, inverted and has formed beyond 2F on the other side of lens"Such image is formed when an object is at:

look-at-the-following-figure-the-image-formed-is-real-maginified-inverted-and-has-formed-beyond-2f-on-the-other-side-of-lens
Question: The image formed by astronomical telescope is ( UP PCS (mains) 2013 )

question-the-image-formed-by-astronomical-telescope-is-up-pcs-mains-2013
Hypermetropia (or long-sightedness) is that defect of vision due to which a person cannot see the nearby objects clearly (though he can see the distant object clearly). This eye defect can be corrected by

hypermetropia-or-long-sightedness-is-that-defect-of-vision-due-to-which-a-person-cannot-see-the-nearby-objects-clearly-though-he-can-see-the-distant-object-clearly-this-eye-defect-can-be-corrected-by
Question: Which of the following is used by the dentist to see the image of teeth of a patient ? ( Chhattisgarh PCS (pre) 2015 )

question-which-of-the-following-is-used-by-the-dentist-to-see-the-image-of-teeth-of-a-patient-chhattisgarh-pcs-pre-2015
Question : The mirror used by a dentist to examine the teeth of patients is ( UP PCS (pre) (Re. Exam ) 2015 )

question-the-mirror-used-by-a-dentist-to-examine-the-teeth-of-patients-is-up-pcs-pre-re-exam-2015
Question: The number of images of an object placed between two parallel mirrors is: ( UP PCS (mains) 2013 ), (UP PCS. (pre) 1994 )

question-the-number-of-images-of-an-object-placed-between-two-parallel-mirrors-is-up-pcs-mains-2013-up-pcs-pre-1994
Question : In order to avoid sunlight, which of the following colour combination for an umbrella is most appropriate ? ( UP PCS (pre) 1993 )

question-in-order-to-avoid-sunlight-which-of-the-following-colour-combination-for-an-umbrella-is-most-appropriate-up-pcs-pre-1993
Question: The mirror, which is used is searchlights, is- ( UP PCS (mains) 2009 )

question-the-mirror-which-is-used-is-searchlights-is-up-pcs-mains-2009
Question: A person standing in front of a mirror finds his image larger than himself. This implies that the mirror is : (67th BPSC. (pre) 2022 )

question-a-person-standing-in-front-of-a-mirror-finds-his-image-larger-than-himself-this-implies-that-the-mirror-is-67th-bpsc-pre-2022
Question: Which mirror is used as a rear view mirror in vehicles ? ( UP PCS (pre) 2011), UP PCS (mains) 2010 )

question-which-mirror-is-used-as-a-rear-view-mirror-in-vehicles-up-pcs-pre-2011-up-pcs-mains-2010
Question: the radius of curvature of the plane mirror is : ( UP Lower Sub. (pre) 2015 )

question-the-radius-of-curvature-of-the-plane-mirror-is-up-lower-sub-pre-2015
Question: The minimum height of mirror required to see whole stand up image of a man of height 1.50 metre shall be ( UP PCS (RI) 2014 )

question-the-minimum-height-of-mirror-required-to-see-whole-stand-up-image-of-a-man-of-height-1-50-metre-shall-be-up-pcs-ri-2014
Question: The minimum height of a plane mirror to see the full size image of a person is equal to - ( UP PCS (pre) 2014 ), UP PCS (pre) 2011), UP PCS (mains) 2011 )

question-the-minimum-height-of-a-plane-mirror-to-see-the-full-size-image-of-a-person-is-equal-to-up-pcs-pre-2014-up-pcs-pre-2011-up-pcs-mains-2011
Question: Dispersion of light is possible by : ( 66th BPSC (pre) (Re. Exam ) 2020 )

question-dispersion-of-light-is-possible-by-66th-bpsc-pre-re-exam-2020
Question: which one of the following colours is seen in the middle of a Rainbow ? ( UP PCS (mains) 2012 )

question-which-one-of-the-following-colours-is-seen-in-the-middle-of-a-rainbow-up-pcs-mains-2012
Question: Assertion (A) : A stick is dipped in water in a slanting position. If observed sideways, the stick appears short and bent at the surface of the water. Reason (R) : A light coming from the stick undergoes scattering from water molecules giving the stick a short and bent appearance. ( IAS (pre) 2001 )

question-assertion-a-a-stick-is-dipped-in-water-in-a-slanting-position-if-observed-sideways-the-stick-appears-short-and-bent-at-the-surface-of-the-water-reason-r-a-light-coming-from-the-stick-undergoes-scattering-from-water-molecules-giving-the-stick-a-short-and-bent-appearance-ias-pre-2001
A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power:

a-person-cannot-see-distinctly-objects-kept-beyond-2-m-this-defect-can-be-corrected-by-using-a-lens-of-power
Question: Consider the following statements : 1. If a person looks at a coin which is in a bucket of water, the coin will appear to be closer than it really is. 2. If a person under water looks at a coin above the water surface, the coin will appear to be at a higher level than it really is. Which of the above statements is/are correct ? ( IAS (pre) 1999 )

question-consider-the-following-statements-1-if-a-person-looks-at-a-coin-which-is-in-a-bucket-of-water-the-coin-will-appear-to-be-closer-than-it-really-is-2-if-a-person-under-water-looks-at-a-coin-above-the-water-surface-the-coin-will-appear-to-be-at-a-higher-level-than-it-really-is-which-of-the-above-statements-is-are-correct-ias-pre-1999
Question: An air bubble inside water behaves as a : ( UP PCS (pre) 2002 )

question-an-air-bubble-inside-water-behaves-as-a-up-pcs-pre-2002
What is the normal range of vision of human eye?

what-is-the-normal-range-of-vision-of-human-eye
Question: An air bubble in water will act like a : ( UP Lower Sub (pre) 2013 ), UP UDA/ LDA (Spl) (pre) 2010 ), UP PCS (Spl) (pre) 2008, IAS (pre) 1995 )

question-an-air-bubble-in-water-will-act-like-a-up-lower-sub-pre-2013-up-uda-lda-spl-pre-2010-up-pcs-spl-pre-2008-ias-pre-1995
Question: In which direction the rainbow is seen at 12 noon ? ( 43rd BPSC. (pre) 1999 )

question-in-which-direction-the-rainbow-is-seen-at-12-noon-43rd-bpsc-pre-1999
Persistence of eye is a phenomenon where the brain continues to send the image even after the object has been removed. This persistence time for human eye is

persistence-of-eye-is-a-phenomenon-where-the-brain-continues-to-send-the-image-even-after-the-object-has-been-removed-this-persistence-time-for-human-eye-is
Question: The correct order of colours in a rainbow is : ( RAS / RTS (pre) 1999 )

question-the-correct-order-of-colours-in-a-rainbow-is-ras-rts-pre-1999
Blind people use Braille code for their reading. How many kind of dot patterns are used for this reading:

blind-people-use-braille-code-for-their-reading-how-many-kind-of-dot-patterns-are-used-for-this-reading
Question: The terminal colour bands of the rainbow are : ( UP lower sub. (mains) 2015 )

question-the-terminal-colour-bands-of-the-rainbow-are-up-lower-sub-mains-2015
Rekha eye is blue coloured, scientifically this portion of eye determine the colour of eye:

rakha-eye-is-blue-coloured-scientifically-this-portion-of-eye-determine-the-colour-of-eye
Question: Rainbow is produced when sunlight falls on drops of rain. Which of the following physical phenomena are responsible for this ? ( IAS (pre) 2013 ) 1. Dispersion 2. Refraction 3. Internal reflection Select the correct answer using the code given below :

question-rainbow-is-produced-when-sunlight-falls-on-drops-of-rain-which-of-the-following-physical-phenomena-are-responsible-for-this-ias-pre-2013-1-dispersion-2-refraction-3-internal-reflection-select-the-correct-answer-using-the-code-given-below
Question: Two glass lenses of same focal length, one being convex and the other concave, are kept in contact, the combination will act as : ( UP PSC (GIC) 2017 )

question-two-glass-lenses-of-same-focal-length-one-being-convex-and-the-other-concave-are-kept-in-contact-the-combination-will-act-as-up-psc-gic-2017
Question: What type of lens is used in magnifying glass ? ( 67th BPSC (pre) (Re. Exam) 2022 )

question-what-type-of-lens-is-used-in-magnifying-glass-67th-bpsc-pre-re-exam-2022
Eyes of some animals shine in the dark because of

why-eyes-of-some-animals-shine-in-the-dark
Question: The least distance of distinct vision is (cm. ) : (UP PCS (mains) 2008 )

question-the-least-distance-of-distinct-vision-is-cm-up-pcs-mains-2008
Question: Which one of the following statement is not correct ? ( UP PCS (mains) 2010 )

question-which-one-of-the-following-statement-is-not-correct-up-pcs-mains-2010
Question: When a person enters into a dark room from the strong light area, he is not able to see clearly for some time. Later he gradually begins to see things, This is because- ( RAS / RTS (pre) 2008 )

question-when-a-person-enters-into-a-dark-room-from-the-strong-light-area-he-is-not-able-to-see-clearly-for-some-time-later-he-gradually-begins-to-see-things-this-is-because-ras-rts-pre-2008
Question: To remove the defect of long sightedness one uses : (43rd BPSC (pre) 1999), (Chhattisgarh PCS (pre) 2016 )

question-to-remove-the-defect-of-long-sightedness-one-uses-43rd-bpsc-pre-1999-chhattisgarh-pcs-pre-2016
Question: A myopic eye can be corrected by using a : ( UP PCS (mains) 2008 ), UP Lower Sub. (pre) 2002 )

question-a-myopic-eye-can-be-corrected-by-using-a-up-pcs-mains-2008-up-lower-sub-pre-2002
Question: which of the following lens is used to minimize Myopia ? ( UP PCS (mains) 2011), ( MP PCS (pre) 2008 )

question-which-of-the-following-lens-is-used-to-minimize-myopia-up-pcs-mains-2011-mp-pcs-pre-2008
Question: The focusing in the eye is done by : ( UP PSC (RI) 2014 )

question-the-focusing-in-the-eye-is-done-by-up-psc-ri-2014
Question: Which one of the following statement is NOT true for a person suffering from hypermetropia ? ( UP PCS (pre) 2010 )

question-which-one-of-the-following-statement-is-not-true-for-a-person-suffering-from-hypermetropia-up-pcs-pre-2010
Question: The change of focal length of an eye lens is caused by action of the : ( Chhattisgarh PCS (pre) 2014 )

question-the-change-of-focal-length-of-an-eye-lens-is-caused-by-action-of-the-chhattisgarh-pcs-pre-2014
Question: Reading glasses are made from which type of lenses ? ( 44th BPSC (pre) 2000 )

question-reading-glasses-are-made-from-which-type-of-lenses-44th-bpsc-pre-2000
Question: Myopia is corrected by using : ( Chhattisgarh PCS (pre) 2016 )

question-myopia-is-corrected-by-using-chhattisgarh-pcs-pre-2016
Question: For the myopic eye, the defect is cured by : ( UP PCS (mains) 2013 )

question-for-the-myopic-eye-the-defect-is-cured-by-up-pcs-mains-2013
Question: Consider the following statement : 1. If magenta and yellow coloured circles intersect, the intersected area will have a red colour. 2. If cyan and magenta coloured circles intersect, the intersected area will have a blue colour. Which of the statements given above is/are correct ? ( IAS (pre) 2007 )

question-consider-the-following-statement-1-if-magenta-and-yellow-coloured-circles-intersect-the-intersected-area-will-have-a-red-colour-2-if-cyan-and-magenta-coloured-circles-intersect-the-intersected-area-will-have-a-blue-colour-which-of-the-statements-given-above-is-are-correct-ias-pre-2007
Question: The power of lens is measured in : ( 66th BPSC. (pre) (Re. Exam 2020 )

question-the-power-of-lens-is-measured-in-66th-bpsc-pre-re-exam-2020
Question: If the lens power of glass is +2 dioptre, is focal length will be- ( 41st BPSC (pre) 1996 )

question-if-the-lens-power-of-glass-is-2-dioptre-is-focal-length-will-be-41st-bpsc-pre-1996
Question: Three colours are the primary colours. These are- ( MP PCS. (pre) 2005 )

question-three-colours-are-the-primary-colours-these-are-mp-pcs-pre-2005
Question: In human eye, image of object forms at ( MP PCS (pre) 2017, 2014, Utt Lower Sub. (pre) 2010 )

question-in-human-eye-image-of-object-forms-at-mp-pcs-pre-2017-2014-utt-lower-sub-pre-2010
Question: The power of a lens is measured in ( MP PCS (pre) 2017 )

question-the-power-of-a-lens-is-measured-in-mp-pcs-pre-2017
Question: When beams of red, blue and green lights fall on the same spot, the colour of the light becomes : ( RAS / RTS (pre) 2003 )

question-when-beams-of-red-blue-and-green-lights-fall-on-the-same-spot-the-colour-of-the-light-becomes-ras-rts-pre-2003
Question: Retina of the eye is comparable to which of the following parts of a traditional camera ? ( UP PCS (pre) 2011 )

question-retina-of-the-eye-is-comparable-to-which-of-the-following-parts-of-a-traditional-camera-up-pcs-pre-2011
Question: For normal eyes what is the minimum distance for clear vision ? ( Chhattisgarh PCS (pre) 2013 )

question-for-normal-eyes-what-is-the-minimum-distance-for-clear-vision-chhattisgarh-pcs-pre-2013
Question: Which one of the following combinations of aperture and shutter speed of a camera will allow the maximum exposure ? ( IAS (pre) 1994 )

question-which-one-of-the-following-combinations-of-aperture-and-shutter-speed-of-a-camera-will-allow-the-maximum-exposure-ias-pre-1994
Question: The colour of an opaque object is due to the colour it- ( IAS (pre) 1994 )

question-the-colour-of-an-opaque-object-is-due-to-the-colour-it-ias-pre-1994
Question: which is not a primary colour ? ( MP PCS (pre) 2015 )

question-which-is-not-a-primary-colour-mp-pcs-pre-2015
Question: Colour in a colour television is produced by a combination of three basic colours, they are : ( RAS/RTS (pre) 1992 )

question-colour-in-a-colour-television-is-produced-by-a-combination-of-three-basic-colours-they-are-ras-rts-pre-1992
Question: Power of the sunglass is- ( UP PCS (pre) 1995 )

question-power-of-the-sunglass-is-up-pcs-pre-1995
Question: The minimum distance of clear vision for a normal healthy eye of human being is supposed to be : ( MP PCS (pre) 2016 )

question-the-minimum-distance-of-clear-vision-for-a-normal-healthy-eye-of-human-being-is-supposed-to-be-mp-pcs-pre-2016
Question: In long-sightedness, images are formed at following : ( UP RO/ARO (mains) 2017 )

question-in-long-sightedness-images-are-formed-at-following-up-ro-aro-mains-2017
Question: Which primary colours produce different shades on TV screen ? ( Utt Lower Sub. (pre) 2010 )

question-which-primary-colours-produce-different-shades-on-tv-screen-utt-lower-sub-pre-2010
Question: The human eye forms the image of an object at its - ( Chhattisgarh PCS (pre) 2014 )

question-the-human-eye-forms-the-image-of-an-object-at-its-chhattisgarh-pcs-pre-2014
Question: Consider the following phenomena : 1. Size of the Sun at dusk 2. Colour of the Sun at dawn 3. Moon being visible at dawn 4. Twinkle of stars in the sky 5. Polestar being visible in the sky Which of the above are optical illusions ? ( IAS (pre) 2013 )

question-consider-the-following-phenomena-1-size-of-the-sun-at-dusk-2-colour-of-the-sun-at-dawn-3-moon-being-visible-at-dawn-4-twinkle-of-stars-in-the-sky-5-polestar-being-visible-in-the-sky-which-of-the-above-are-optical-illusions-ias-pre-2013
Question: The number of colours contained in the sunlight is- ( UP PCS (mains) 2015 )

question-the-number-of-colours-contained-in-the-sunlight-is-up-pcs-mains-2015
Question: Find out the odd colour from the following options- ( RAS/RTS (pre) 1999 )

question-find-out-the-odd-colour-from-the-following-options-ras-rts-pre-1999

10.Optics

Which one of the following types of waves are used in a night vision apparatus?

which-one-of-the-following-types-of-waves-are-used-in-a-night-vision-apparatus

Question: The nature of radiation of light is- ( 42nd BPSC (pre) 1997-98 )

question-the-nature-of-radiation-of-light-is-42nd-bpsc-pre-1997-98

Question: Which of the following statements is true ? ( UP Lower Sub. (pre) 2002 )

question-which-of-the-following-statements-is-true-up-lower-sub-pre-2002

Question: The visible range of solar radiation is- ( 53rd to 55th BPSC (pre) 2011 )

question-the-visible-range-of-solar-radiation-is-53rd-to-55th-bpsc-pre-2011

Question: Which of the following radiation has the highest energy per quantum ? ( Utt PCS (pre)2012 )

question-which-of-the-following-radiation-has-the-highest-energy-per-quantum-utt-pcs-pre-2012

Light can not pass through:

light-can-not-pass-through

Question: The wave length extension of visible light is- ( UP PCS (mains) 2005 )

question-the-wave-length-extension-of-visible-light-is-up-pcs-mains-2005

What do you mean by word "Rectilinear propagation of Light".

what-do-you-mean-by-word-rectilinear-propagation-of-light

Which among the following is luminous body?

which-among-the-following-is-luminous-body

Question

question

When shadow is formed by a light source smaller than the object by an opaque object two patches of shadow is seen. The inner patch is completely dark. This completely dark portion is of a shadow is called:

when-shadow-is-formed-by-a-light-source-smaller-than-the-object-by-an-opaque-object-two-patches-of-shadow-is-seen-the-inner-patch-is-completly-dark-this-completly-dark-portion-is-of-a-shadow-is-called

Question: Which of the following statement is not correct ? ( UP RO/ARO. (pre) 2021 )

question-which-of-the-following-statement-is-not-correct-up-ro-aro-pre-2021

Question:

question

Question: Among the colours mentioned below, the eye is most sensitive to colours between : ( UP PCS (mains) 2008 )

question-among-the-colours-mentioned-below-the-eye-is-most-sensitive-to-colours-between-up-pcs-mains-2008

Question

question

Question: Light appears to travel in a straight line because- ( UP PSC (R.I) 2014 )

question-light-appears-to-travel-in-a-straight-line-because-up-psc-r-i-2014

Question: The speed of light in air depends on: ( Jharkhand PCS (pre) 2021 )

question-the-speed-of-light-in-air-depends-on-jharkhand-pcs-pre-2021

Question: The speed of light will be minimum while passing through- ( IAS (pre) 1994 ), 67th BPSC (pre) (Re. Exam) 2022 )

question-the-speed-of-light-will-be-minimum-while-passing-through-ias-pre-1994-67th-bpsc-pre-re-exam-2022

Question: Light travels at a maximum speed in : ( Utt. PCS (pre) 2021 )

question-light-travels-at-a-maximum-speed-in-utt-pcs-pre-2021

Question: The time taken to reach the Sunlight up to the surface of earth is approximately - ( 42nd BPSC (pre) 1997 )

question-the-time-taken-to-reach-the-sunlight-up-to-the-surface-of-earth-is-approximately-42nd-bpsc-pre-1997

Question: Velocity of light is maximum in - ( UP PSC (RI) 2014 )

question-velocity-of-light-is-maximum-in-up-psc-ri-2014

Question: What is he reason behind the extra ordinary shining of the diamond cuts in a proper way ? ( IAS (pre) 1994 )

question-what-is-he-reason-behind-the-extra-ordinary-shining-of-the-diamond-cuts-in-a-proper-way-ias-pre-1994

Question: The diamond appears lustrous because of : ( UP PCS. (Mains) 2012 ), UP PCS (pre) 1996 )

question-the-diamond-appears-lustrous-because-of-up-pcs-mains-2012-up-pcs-pre-1996

Question: The formation of glittering colours in thin foam of soap is the result of which of the following phenomenon- ( IAS (pre) 1993 )

question-the-formation-of-glittering-colours-in-thin-foam-of-soap-is-the-result-of-which-of-the-following-phenomenon-ias-pre-1993

Question: A cut diamond shines brilliantly due to ( UP PCS (pre) 2017 ), UP PCS (mains) 2015 )

question-a-cut-diamond-shines-brilliantly-due-to-up-pcs-pre-2017-up-pcs-mains-2015

Question: When a ray of light travels from a denser medium to a rarer medium then ( Chhattisgarh PCS (pre) 2018 )

question-when-a-ray-of-light-travels-from-a-denser-medium-to-a-rarer-medium-then-chhattisgarh-pcs-pre-2018

Why we can not see shadow of bird flying in the air?

why-we-can-not-see-shadow-of-bird-flying-in-the-air

Question: When light passes from one medium to another medium, which one of the followings does not change : ( UP PCS (mains) 2003 )

question-when-light-passes-from-one-medium-to-another-medium-which-one-of-the-followings-does-not-change-up-pcs-mains-2003

Question: Which of the following does not change when light travels from one medium to another ? ( 66th BPSC (pre) 2020 )

question-which-of-the-following-does-not-change-when-light-travels-from-one-medium-to-another-66th-bpsc-pre-2020

The image formed by the pin hole camera is always

the-image-formed-by-the-pin-hole-camera-is-always

Question: Which of the following has the highest velocity ? ( UP PCS (pre) 2018 )

question-which-of-the-following-has-the-highest-velocity-up-pcs-pre-2018

Question: Total internal reflection can take place when light travels from : ( IAS (pre) 1996 )

question-total-internal-reflection-can-take-place-when-light-travels-from-ias-pre-1996

Question: When light waves pass from air to glass the variable affected are- ( IAS (pre) 2001 )

question-when-light-waves-pass-from-air-to-glass-the-variable-affected-are-ias-pre-2001

Question: The sunlight from the sun to the earth reaches in : ( 65th BPSC (pre) 2019 )

question-the-sunlight-from-the-sun-to-the-earth-reaches-in-65th-bpsc-pre-2019

Question: Light from the sun reaches Earth in about : ( UP PCS (mains) 2006 )

question-light-from-the-sun-reaches-earth-in-about-up-pcs-mains-2006

Question: Which of the following is used to take 3-dimensional pictures - ( UP PCS (mains) 2008 ), UP PCS. (pre) 1990 )

question-which-of-the-following-is-used-to-take-3-dimensional-pictures-up-pcs-mains-2008-up-pcs-pre-1990

Question: Which one of the following reflects back more sunlight as compared to other three ? ( UP PCS (pre) 2021 )

question-which-one-of-the-following-reflects-back-more-sunlight-as-compared-to-other-three-up-pcs-pre-2021

Question: Optical fibre works on the principle of : ( UP UDA/LDA (pre) 2010, UP PCS (spl.) (pre) 2008, IAS (pre) 1995 )

question-optical-fibre-works-on-the-principle-of-up-uda-lda-pre-2010-up-pcs-spl-pre-2008-ias-pre-1995

Question: The phenomenon used in optical fiber for transmission of light energy is ( UP PCS (pre) 2019 )

question-the-phenomenon-used-in-optical-fiber-for-transmission-of-light-energy-is-up-pcs-pre-2019

Which one of the Statement is not wrong?