Light Energy Test

Result

Light Energy Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

the color of light is obtained when we mix beams of light of all color is-

A
White

B
Blue

C
Green

D
Black

Solution

According to the question the correct option will be ‘A’ because When white light is passed through a prism, it splits into seven different colors namely, red, orange, yellow, green, blue, indigo and violet. If we do the reverse, that is mix the beams of light of all color, white light is obtained.
Question 2
1 / -0

the spherical mirror that does the inner surface and the outer surface of a polished spoon act as is-

A
Inner - concave; Outer - convex

B
Inner - concave; Outer - concave

C
Inner - convex; Outer - concave

D
Inner - convex; Outer - convex

Solution

According to the question the correct option will be ‘A’ because a spherical mirror is a mirror with a curved reflecting surface. The surface may be either convex (bulging outward) or concave (bulging inward). The inner surface of a spoon acts as a concave mirror and the outer surface of the spoon acts as a convex mirror.
Question 3
1 / -0

The color is represented by the letter "I” in "VIBGYOR” is called-

A
Ivory

B
Ink

C
Indigo

D
Indica

Solution

According to the question the correct option will be ‘C’ because The letter "I” in "VIBGYOR” represents the color "indigo”. VIBGYOR stand for violet, indigo, blue, green, yellow, orange and red.
Question 4
1 / -0

A magnified virtual image can be produced by a ______

A
plane mirror

B
concave mirror

C
convex mirror

D
prism

Solution

According to the question the correct option will be ‘B’ because When the object is kept in between focus and the pole, a concave mirror forms an enlarged, virtual and erect image. A convex mirror always forms diminished virtual image. A plane mirror always forms a virtual and erect image without any magnification.
Question 5
1 / -0

the speed at which the light travels in vacuum is.

A
3×10⁶m/s

B
3×10⁸m/s

C
3×10¹⁰m/s

D
3×10¹²m/s

Solution

According to the question the correct option will be ‘B’ because the speed at which the light travels in vacuum is 3×10⁸m/s.
Question 6
1 / -0

Light is a form of _______ that we detect with our _______.

A
energy, ears

B
corpuscles, eyes

C
energy, eyes

D
sensation, skin

Solution

Visible light is a range of wavelengths in the electromagnetic spectrum between infrared and ultraviolet for which we have the capability to visually detect. So, light is a form of energy that we detect with our eyes.
Question 7
1 / -0

In a room lighted by an electric bulb, it is found that the shadow of the ceiling fan hung in the centre is falling on a wall opposite to the door. What can you say about the position of the bulb?

A
On the wall having the door

B
On the wall facing the door

C
On the wall on your right as you enter the room

D
On the wall on your left as you enter the room

Solution

According to the question the correct option will be ‘A’ because When we put any object in between the light source it forms a shadow of that object. The closer the object is to the source of the light, the more light it blocks out, so its shadow is bigger. But if the object is further away, it does not block out much light, and so the shadow is smaller.

Therefore, for the shadow of the ceiling fan to be formed on a wall opposite to the door, the electric bulb must be positioned on the wall having the door.
Question 8
1 / -0

A point object is settled in front of a plane mirror. If the object and the mirror start moving away from each other with speed v along a straight line, then speed of the image with respect to mirror is-

A
2v

B
v

C
5v

D
6v

Solution

According to the question the correct option will be ‘A’ because

Imagine you are standing in front of a mirror and moves x units away from the mirror, so you can see that your image also moves away from the mirror by x units. i.e. 2x units away from you.

So both move in equal time duration, same can be said for velocities.

Therefore image velocity with respect to object will be 2v.

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Re-Attempt Weekly Quiz Competition

Light Energy Test - 2

Result

Light Energy Test - 2

Score

-

Rank

-

SHARING IS CARING

Question 1

White

Blue

Green

Black

Solution

Question 2

Inner - concave; Outer - convex

Inner - concave; Outer - concave

Inner - convex; Outer - concave

Inner - convex; Outer - convex

Solution

Question 3

Ivory

Ink

Indigo

Indica

Solution

Question 4

plane mirror

concave mirror

convex mirror

prism

Solution

Question 5

3×106m/s

3×108m/s

3×1010m/s

3×1012m/s

Solution

Question 6

energy, ears

corpuscles, eyes

energy, eyes

sensation, skin

Solution

Question 7

On the wall having the door

On the wall facing the door

On the wall on your right as you enter the room

On the wall on your left as you enter the room

Solution

Question 8

2v

v

5v

6v

Solution

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3×10⁶m/s

3×10⁸m/s

3×10¹⁰m/s

3×10¹²m/s