Practice Test

Q1) The red colour of the sun at the time of sunrise and sunset is because : Show Answer

Q2) Which of the following phenomena of light are involved in formation of a rainbow? Show Answer

Q3) Twinkling of stars is due to atmospheric Show Answer

Q4) The bluish colour of water in deep sea is due to : Show Answer

Q5) At noon, the sun appears white as : Show Answer

Q6) Which of the statement is correct regarding the propagation of light of different colours of white light in air ? Show Answer

Q7) Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset ? Show Answer

Q8) A clear sky appears blue, because : Show Answer

Q9) The danger signals installed at the top of fall buildings are red in colour. These can be easily seen from a distance because : Show Answer

Q10) The sun appear red at sunrise or sunset. Choose the incorrect statements from the following : Show Answer

Q11) In an experiment to trace the path of a ray of light through a triangular glass prism, a student would observe that the emergent ray : Show Answer

Q12) The sky appears dark to the passengers flying at very high altitudes mainly because : Show Answer

Q13) In which of the following diagrams is the path of a ray of light passing through a glass prism shown correctly ? Show Answer

Q14) The phenomena of light responsible for the working of the human eye is : Show Answer

Q15) When white light passes through the achromatic combination of prism, then what is observed ? Show Answer

Q16) Who discovered the experiments with glass prism that white light consists of seven colours ? Show Answer

Q17) The light that refracts most while passing through a prism : Show Answer

Q18) The splitting of white light into different colours on passing through a prism is called : Show Answer

Q19) Twinkling of stars is due to : Show Answer

Q20) The dispersive power will be maximum for : Show Answer

Q21) Which ray is least deviated by a prism ? Show Answer

Q22) The dispersive power of prism depends upon : Show Answer

Q23) Assertion :
There exist two angles of incidence for the same magnitude of deviation (except minimum deviation) by a prism kept in the air.
Reason :
In a prism kept in air, a ray is incident on first surface and emerges out of second surface. Now, if another ray is incident on second surface (or prism) along the previous emergent ray, then this ray emerges out of first surface along the previous incident ray. This phenomenon is called the principle of reversibility of light. Show Answer

Q24) Assertion :
The sequence of rainbow colour is represented as VIBGYOR.
Reason :
Formation of VIBGYOR sequence colour is due to the dispersion of white light. Show Answer

Q25) Assertion :
The Sun appears red during sunrise or sunset.
Reason :
The scattering of light is inversely proportional to its wavelength. Show Answer

Q26) Assertion :
A beam of white light gives a spectrum on passing through a hollow prism.
Reason :
Speed of light outside the prism is different from the speed of light inside the glass prism. Show Answer

Q27) The angle between the two refracting surfaces of a prism is called: Show Answer

Q28) The angle between the incident ray and the emergent ray is called : Show Answer

Q29) When a ray is refracted through a prism, then Show Answer

Q30) The angle of deviation depends upon : Show Answer

Q31) The rectangular surfaces of a prism are known as : Show Answer

Q32) Which of the following statements is correct regarding the propagation of light of different colours of white light in the air ? Show Answer

Q33) Which of the following is the correct order of wavelength ? Show Answer

Q34) Which of the following is the correct order of speed of light in glass ? Show Answer

Q35) Which colour has the maximum frequency? Show Answer

Q36) Which of the following is the correct order of : Show Answer

Q37) To an astronaut in a spaceship, the colour of the earth appears : Show Answer

Q38) At the time of sunrise and sunset, the light from the sun has to travel : Show Answer

Q39) The colour of the sky appears blue due to : Show Answer

Q40) At the time of sunset : Show Answer

Q41) Danger signals are always painted in red. Choose the incorrect statement : Show Answer

Q42) Due to atmospheric refraction, the apparent length of the day. Show Answer

Q43) Apparent position of the stars appears raised due to : Show Answer

Q44) The sun appears oval-shaped or flattened due to : Show Answer

Q45) Which of the following given statement is incorrect ? Show Answer

Q46) In absence of atmosphere, the colour of the sky appears : Show Answer

Q47) Which of the following statements is incorrect ? Show Answer

Q48) Red colour is selected for danger signals because : Show Answer

Q49) Choose the correct option : Show Answer

Q50) The speed of light depends upon : Show Answer

Q51) The clear sky appears blue because Show Answer

Q52) Which of the following statements is correct regarding the propagation of light of different colours of white light in air? Show Answer

Q53) In experiment to trace the path of a ray pf light through a triangular glass prism, a student would observe that the emergent ray Show Answer

Q54) Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): A white light on passing through prism splits into its component colours as such that the red light emerges nearest to the base of the prism.
Reason (R): Wavelength of red light is more than other component colour and hence, red light deviates least. Show Answer

Q55) Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A):Sunlight reaches us without dispersion in the form of white light and not as its components.
Reason (R):Dispersion takes place due to variation of refractive index for different wavelength but in vacuum the speed of light is independent of wavelength and hence vacuum is a non-dispersive medium. Show Answer

Q56) Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): In case of rainbow, light at the inner surface of the water drop gets internally reflected.
Reason (R): The angle between the refracted ray and normal to the drop surface is greater than the critical angle. Show Answer

Q57) Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): Scattering of light is the reflection of light from an object in all directions.
Reason (R): The colour of scattered light depends on the size of scattering particles and wavelength of light. Show Answer

Q58) The phenomenon observed in above set-up is Show Answer

Q59) In nature, this phenomenon is observed in Show Answer

Q60) Which of the following statement is correct about constituents of white light based on above observations? Show Answer

Q61) The cause of dispersion of light is Show Answer

Q62) Read the following statements carefully
i) The prism behaves same as that of the rectangular glass slab.
ii) All the colours have different angles of deviation in case of dispersion through prism.
iii) All the colours travel with the same speed of light in glass.
iv) Dispersion of light is observed in case of rectangular glass slab.
Which of the above statement/s is true? Show Answer

Q63) The muscular diaphragm that controls the size of the pupil is Show Answer

Q64) Having two eyes facilitates in
A: Increasing the field of view
B: Bringing three dimensional view
C: Developing the concept of distance /size
Then the correct option is/are Show Answer

Q65) The black opening between the aqueous humour and the lens is called Show Answer

Q66) Near and far points of young person normal eye respectively are: Show Answer

Q67) The defect of vision in which the person is able to see distant object distantly but cannot see nearby objects clearly is called Show Answer

Q68) The ability of eye lens to adjust its focal length to form a sharp image of the object at varying distances on the retina is called Show Answer

Q69) Myopia and hypermatropia can be corrected by Show Answer

Q70) Bi-focal lens are required to correct Show Answer

Q71) The defective eye of a person has near point 0.5 m and point 3 m. The power far corrective lens required for (i) reading purpose and (ii) seeing distant objects, respectively are: Show Answer

Q72) The image formed on the retina of the human eye is Show Answer

Q73) When white light enters a prism, it gets split into its constituents colours. This is due to Show Answer

Q74) The air layer of atmosphere whose temperature is less then the hot layer behave as optically Show Answer

Q75) Refraction of light by the earth's atmosphere due to variation in air density is called Show Answer

Q76) The deflection of light by minute particles and molecules of the atmosphere in all direction is called _____of light Show Answer

Q77) one cannot see through the fog, because Show Answer

Q78) A person cannot see distinctly objects kept beyond 2 m. This defect can be corrected by using a lens of power Show Answer

Q79) A prism ABC (with BC as base) is placed in different orientation. A narrow beam of white light is incident on the prism as shown in figure. In which of the following cases, after dispersion, the third colour from the top corresponds to the colour of the sky? Show Answer

Q80) At noon the sun appear white as Show Answer

Q81) When light rays enter the eye, most of the refraction occurs at the Show Answer

Q82) The focal length of the eye lens increases whrn eye muscles Show Answer

Q83) Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): Blind spot is a small area of the retina which is insensitive to light where the optic nerve leaves the eye.
Reason (R): There are no rods or cones present at the junction of optic nerve and retina in the eye. Show Answer

Q84) Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): The near-point of a hyper - metropic eye is more than 25 cm away.
Reason (R): Hypermetropia is corrected using spectacles containing concave lenses. Show Answer

Q85) Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): Myopia is the defect of vision in which a person cannot see the distant objects clearly.
Reason (R): This due to eye-ball being too short. Show Answer

Q86) Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): Concave mirrors are used as reflectors in torches, vehicle head-lights and in search lights.
Reason (R): When an object is placed beyong the centre of curvature of a concave mirror, the image formed is real and inverted. Show Answer

Q87) Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): The light emerges from a parallel sided glass slab in a direction perpendicular with that in which enters the glass slab.
Reason (R): The perpendicular distance between the original path of incident ray. Show Answer

Q88) 28 frames are projected per second in motion picture. Show Answer

Q89) Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): When a pencil is partly immersed in water and held obliquely to the surface, the pencil appears to bend at the water surface.
Reason (R): The apparent bending of the pencil is due to the refraction of light when it passes from water to air. Show Answer

Q90) Myopia is caused due to excessive curvature in cornea. Show Answer

Q91) A lens of higher focal length has less power. Show Answer

Q92) Power of accommodation for a normal eye is 4 dioptre. Show Answer

Q93) The optical nerves carry signals to the brain. Show Answer