Light Test

Result

Light Test - 6

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Weekly Quiz Competition

Question 1
1 / -0

In order to increase the magnifying power of a telescope,

A
the focal powers of the objective and the eye piece should be large

B
the objective should have small focal length, and the eye piece should be large

C
both should have large focal lengths

D
the objective should have large focal length and the eye- piece should have small

Solution

In order to increase the magnifying power of a telescope, the objective should have large focal length and the eye-piece should have small.
Question 2
1 / -0

In a compound microscope, the intermediate image is

A
virtual, erect and magnified

B
real, erect and magnified

C
real, inverted and magnified

D
virtual, erect and reduced

Solution

In a compound microscope, the intermediate image is real, inverted and magnified.
Question 3
1 / -0

In dispersion by a prism, we can see the colours in the decreasing order of deviation as :

A
blue, violet, yellow, red

B
red, yellow, violet, indigo

C
red, yellow, green, orange

D
orange, yellow, green, blue

Solution

In dispersion by a prism, we can see the colours in the order: orange, yellow, green, blue.
Question 4
1 / -0

'Dispersion' is the term used to describe

A
propagation of light in straight lines

B
splitting of a beam of light into component colours

C
bending of a beam of light when it strikes a mirror

D
change that takes place in white light after passage through red glass

Solution

'Dispersion' is the term used to describe splitting of a beam of light into component colours.
Question 5
1 / -0

To astronauts in a space ship, the sky appears dark because

A
light from the sky is absorbed by the medium

B
the fact that human eye becomes blind to the blue colour

C
there is no atmosphere

D
of cosmic rays

Solution

To astronauts in a space ship, the sky appears dark because there is no atmosphere.
Question 6
1 / -0

Mirages are observed in deserts due to the phenomenon of

A
double reflection of light

B
total internal reflection

C
refraction

D
scattering of light

Solution

Mirages are observed in deserts due to the phenomenon of total internal reflection of light.
Question 7
1 / -0

In cold countries, the phenomenon of looming (i.e. ship appears in the sky) takes place, because refractive index of air

A
decreases with height

B
increases with height

C
does not change with height

D
becomes infinity at the surface

Solution

In cold countries, the phenomenon of looming (i.e. ship appears in the sky) takes place, because refractive index of air decreases with height.
Question 8
1 / -0

The power of the eye lens to adjust its focal length according to the distance so that image is formed on the retina, is called

A
astigmatism

B
accommodation

C
magnification

D
none of the above

Solution

The power of the eye lens to adjust its focal length according to the distance so that image is formed on the retina, is called accommodation.
Question 9
1 / -0

A person can see clearly up to 3 metres. If he wants to see up to 12 metres, he should use a

A
convex lens

B
concave lens

C
concavo–convex lens

D
cylindrical lens.

Solution

A person can see clearly up to 3 metres. If he wants to see up to 12 metres, he should use a concave lens.

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Re-Attempt Weekly Quiz Competition

Light Test - 6

Result

Light Test - 6

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SHARING IS CARING

Question 1

the focal powers of the objective and the eye piece should be large

the objective should have small focal length, and the eye piece should be large

both should have large focal lengths

the objective should have large focal length and the eye- piece should have small

Solution

Question 2

virtual, erect and magnified

real, erect and magnified

real, inverted and magnified

virtual, erect and reduced

Solution

Question 3

blue, violet, yellow, red

red, yellow, violet, indigo

red, yellow, green, orange

orange, yellow, green, blue

Solution

Question 4

propagation of light in straight lines

splitting of a beam of light into component colours

bending of a beam of light when it strikes a mirror

change that takes place in white light after passage through red glass

Solution

Question 5

light from the sky is absorbed by the medium

the fact that human eye becomes blind to the blue colour

there is no atmosphere

of cosmic rays

Solution

Question 6

double reflection of light

total internal reflection

refraction

scattering of light

Solution

Question 7

decreases with height

increases with height

does not change with height

becomes infinity at the surface

Solution

Question 8

astigmatism

accommodation

magnification

none of the above

Solution

Question 9

convex lens

concave lens

concavo–convex lens

cylindrical lens.

Solution

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