CBSE Class 10 Science The Human Eye and the Colourful World MCQs Set 05

Question. The phenomenon of light responsible for the working of the human eye is         
(a) reflection
(b) refraction
(c) power of accommodation
(d) persistence of vision.

Answer: B

Question. The image formed on the retina of human eye is       
(a) virtual and erect
(b) real and erect
(c) virtual an inverted
(d) real and inverted

Answer: D

Question. The change in the focal length of human eye is caused due to         
(a) ciliary muscles
(b) pupil
(c) cornea
(d) iris

Answer: A

Question. The human eye forms the image of an object at its           
(a) cornea.
(b) iris.
(c) pupil.
(d) retina.

Answer: D

Question. The least distance of distinct vision for a young adult with normal vision is about           
(a) 25 m.
(b) 2.5 cm.
(c) 25 cm.
(d) 2.5 m.

Answer: A

Question. The light sensitive cell present on retina and is sensitive to the intensity of light is:       
(a) cones
(b) rods
(c) both rods and cones
(d) none of these

Answer: B

Question. Which of the following colours is least scattered by fog, dust of smoke?         
(a) Violet
(b) Blue
(c) Red
(d) Yellow

Answer: C

Question. The coloured light that refracts most while passing through a prism is         
(a) Yellow
(b) Violet
(c) Blue
(d) Red

Answer: B

Question. The change in focal length of an eye lens is caused by the action of the       
(a) pupil.
(b) retina.
(c) ciliary muscles.
(d) iris.

Answer: C

Question. The amount of light entering the human eye is controlled by           
(a) Ciliary muscles
(b) Pupil
(c) Cornea
(d) Iris

Answer: B

Question. The least distance of distinct vision for a young adult with normal vision is   
(a) 25 m
(b) 20 m
(c) 25 cm
(d) 20 cm

Answer: C

Question. The persistence of vision for normal eye is       
(a) (1/10) th of a second
(b) (1/16) th of a second
(c) (1/6) th of a second
(d) (1/18) th of a second 

Answer: B

Question. The eye defect represented by the figure is 

(a) Myopia
(b) Hypermetropia
(c) Cataract
(d) Presbyopia

Answer: A

Question. The following illustration represents the   

(a) Correction of eye defect
(b) working of a simple microscope
(c) both (a) and
(b) (d) none of the above

Answer: B

Question. Colour blindness is caused due to         
(a) lack of rod cells
(b) absence of optic nerve
(c) lack or cone cells
(d) none of these

Answer: C

Question. The human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to
(a) presbyopia
(b) far-sightedness
(c) near-sightedness
(d) accommodation

Answer: D

Question. Long-sightedness or hypermetropia can be corrected by         
(a) Contact lens
(b) Concave lens
(c) Convex lens
(d) Bifocal lens

Answer: C

Question. The focal length of human eye lens can be changed due to     
(a) Iris
(b) Ciliary muscles
(c) Contact lens
(d) Spectacles

Answer: B

Question. The part of eye that determines the colour of the eye of a person is         
(a) Pupil
(b) Cornea
(c) Retina
(d) Iris

Answer: D

Question. The glass has greater refractive index for           
(a) Violet light
(b) Green light
(c) Blue light
(d) Red light

Answer: A

Question. The colour of sky is blue during day time, red during sunset and black at night. This is due to         
(a) Scattering of light
(b) Small particles present in atmosphere
(c) Atmospheric refraction
(d) All of the above.

Answer: D

Question. Which part of the eye refracts light entering the eye from external objects?         
(a) Lens
(b) Cornea
(c) Iris
(d) Pupil

Answer: B

Question. A student of class 10, is not able to see clearly the black board Question when seated at a distance of 5 m from the board, the defect he is suffering from is         
(a) Myopia
(b) Hypermetropia
(c) Presbyopia
(d) Astigmatism

Answer: A

Question. The component of white light with greatest wavelength is                
(a) Violet
(b) Red
(c) Green
(d) Blue

Answer: B

Following questions consists of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:
A. Both assertion and reason are true, and reason is the correct explanation of assertion.
B. Both assertion and reason are true, but reason is not the correct explanation of assertion.
C. Assertion is true but reason is false.
D. Assertion is false and reason is true.

Question. Assertion(A): The red light bends the least while the violet bends the most.
Reason(R): Red light has short wavelength whereas violet has long wavelength.

Answer: C

Question. Assertion(A): The Sun appears flattened at sunrise and sunset.
Reason (R): The apparent flattering of the Sun’s disc at sunrise and sunset is due to atmospheric refraction.

Answer: A

Question. Assertion (A): The twinkling of stars is due to the fact that refractive index of the earth’s atmosphere fluctuates.
Reason (R): In cold countries, the phenomenon of looming (i.e ship appears in the sky) takes place, because refractive index of air decreases with height

Answer: B

Question. Assertion(A) : Just before sunset ,the sun appears to be elliptical. this may happen due to refraction
Reason (R) : Refraction of light rays through atmosphere may cause different magnification in mutually perpendicular directions.

Answer: A