Test: Human Eye And Colourful World - 4


25 Questions MCQ Test NCERT Textbooks (Class 6 to Class 12) | Test: Human Eye And Colourful World - 4


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QUESTION: 1

Which is the correct condition for the total internal reflection to occur ?

Solution:

The conditions for total internal reflection are the the light is travelling from an optically denser medium (higher refractive index) to an optically less dense medium (lower refractive index) and that the angle of incidence is greater than the critical angle.

QUESTION: 2

If the angle of incidence is increased for a pair of air – glass interface, then the angle of refraction will

Solution:

As the angle of incidence increases the angle of refraction decreases.

QUESTION: 3

The lateral displacement of an incident ray passing out of a rectangular glass slab

Solution:
QUESTION: 4

Find the incorrect statement

Solution:
QUESTION: 5

A person developing near sightedness due to-

Solution:
QUESTION: 6

Which of the following phenomena is not the result of total internal reflection ?

Solution:

Twinkling of stars is caused by the passing of light through different layers of a turbulent atmosphere. Looming is the most noticeable and most often observed of these refraction phenomena

QUESTION: 7

Danger signals are red in colour because

Solution:
QUESTION: 8

Optical fibre is used for

Solution:
QUESTION: 9

A person cannot see distinctly any object placed beyond 40cm from his eyes. Calculate the power of the lens which will help him to see distant objects clearly.

Solution:

Power = 100 /  f in cm = 100/(-40) = -2.5 dioptre

QUESTION: 10

Bees are sensitive to

Solution:
QUESTION: 11

Statement A : Improper functioning of rod shaped cells causes colour blindness 
Statement B : The focal length of the human eye can be increased or decreased

Solution:
QUESTION: 12

A boy uses spectacles of focal length – 50cm. Hence the defect of vision, he is suffering from-

Solution:
QUESTION: 13

What happens to the image distance in the eye when we increase the distance of an object from the eye ?

Solution:
QUESTION: 14

The near point of a hypermetropic person is 75 cm if the person uses eye glasses having power +1.0D, Calculate the distance of distinct vision for him ?

Solution:

As we know that P=1/f
p=100/f
f=100/p
f=100cm
From lens formula :
1/f=1/v-1/u
1/u=1/v-1/f
1/u=1/-75 +1/00 [ by sign conventions]
1/u=-4+3/300
1/u=-1/300
u= - 300cm
∴ the distance of distinct vision for him is -300cm

QUESTION: 15

What is the value of refractive index of the medium if the critical angle of incidence in a denser – rarer inter face is equal to 45° ?

Solution:

Sine(Critical angle) = 1/refractive index so sin 45 = 1/1.41/1.4 = 1/ refractive index hence refractive index = 1.44

QUESTION: 16

Match the following with correct response. 

Solution:
QUESTION: 17

Match the following with correct response.

 

Solution:
QUESTION: 18

Match the following with correct response. 

Solution:
QUESTION: 19

Match the following with correct response. 

Solution:
QUESTION: 20

Match the following with correct response. 

Solution:
QUESTION: 21

Match the following with correct response. 

Solution:
QUESTION: 22

Match the following with correct response. 

Solution:
QUESTION: 23

Match the following with correct response. 

Solution:
QUESTION: 24

Match the following with correct response. 

Solution:
QUESTION: 25

Which of following phenomena based on atmospheric refraction and total internal reflection 
A. Sun appears to rise 2 minutes before and 2 minutes later 
B. Stars seen higher than they actually are 
C. Rainbow
D. Blue colour of clear sky

Solution:

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