Light Test

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Light Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

When an ultraviolet radiation is incident on a surface, no photoelectrons are emitted. If a second beam causes photo-electrons to be ejected, it may consist of

A
radiowaves

B
infrared rays

C
visible light

D
X-rays

Solution

When an ultraviolet radiation is incident on a surface, no photoelectrons are emitted. If a second beam causes photoelectrons to be ejected, it may consist of X-rays.
Question 2
1 / -0

A red cross on a white background, when seen through a red filter,

A
will appear as red cross on a white background

B
will appear as red cross on a black background

C
will appear as black cross on a red background

D
will become invisible

Solution

A red cross on a white background, when seen through a red filter, will become invisible.
Question 3
1 / -0

A bird flying high up in air does not cast shadow on the ground because

A
the size of bird is smaller than sun

B
the size of bird is smaller than earth

C
light rays fall almost normally on the bird

D
birds reflect light

Solution

A bird flying high up in air does not cast shadow on the ground because the size of bird is smaller than sun.
Question 4
1 / -0

A man is 170 cm tall. He wants to see his full length image in a plane mirror. If his eyes are at a height of 164 cm from the ground, minimum length of the plane mirror should be

A
85 cm

B
82 cm

C
170 cm

D
164 cm

Solution

To see full length image in a plane mirror, the minimum length of the mirror should be half the length of the object.
Question 5
1 / -0

Which of the following capital English letters does not show lateral inversion?

A
N

B
O

C
P

D
Q

Solution

O does not show lateral inversion.
Question 6
1 / -0

In a looking mirror or a window pane, you find that your face appears larger than normal. The mirror or window pane is

A
plane mirror

B
concave mirror

C
convex mirror

D
none of the above

Solution

In a looking mirror or a window pane, you find that your face appears larger than normal. The mirror or window pane is concave mirror.
Question 7
1 / -0

If the angle of incidence is equal to the critical angle, the angle of refraction will be

A
0^o

B
45^o

C
90^o

D
180^o

Solution

If the angle of incidence is equal to the critical angle, the angle of refraction will be 90^o.
Question 8
1 / -0

A convex lens of focal length 1 metre is placed in contact with another concave lens of equal focal length. What is the focal length of the new lens formed?

A
0

B
+ 2 m

C
+ 1 m

D
∞

Solution

Focal length foe convex lens = 1 m
Focal length for concave lens = - 1 m

Total focal length = 0 m
Power = 1/0 = ∞

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Re-Attempt Weekly Quiz Competition

Light Test - 3

Result

Light Test - 3

Score

-

Rank

-

SHARING IS CARING

Question 1

radiowaves

infrared rays

visible light

X-rays

Solution

Question 2

will appear as red cross on a white background

will appear as red cross on a black background

will appear as black cross on a red background

will become invisible

Solution

Question 3

the size of bird is smaller than sun

the size of bird is smaller than earth

light rays fall almost normally on the bird

birds reflect light

Solution

Question 4

85 cm

82 cm

170 cm

164 cm

Solution

Question 5

N

O

P

Q

Solution

Question 6

plane mirror

concave mirror

convex mirror

none of the above

Solution

Question 7

0o

45o

90o

180o

Solution

Question 8

0

+ 2 m

+ 1 m

∞

Solution

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Question Analysis

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0^o

45^o

90^o

180^o