Light Shadows And Reflection Test

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Light Shadows And Reflection Test - 10

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Question 1
1 / -0

Which of the following statements is true?

A
The colour of an object determines the colour of the shadow.

B
The shape of an object determines the size of the shadow.

C
The distance of an object from the light source determines the size of the shadow.

D
The density of an object determines the size of the shadow.

Solution

The distance of an object from the light source determines the size of the shadow.
Question 2
1 / -0

In which type of reflection do all the incident rays travel in the same direction parallel to one another, and consequently the corresponding reflective angles are also the same?

A
Specular reflection

B
Diffused reflection

C
Mirror reflection

D
Lake reflection

Solution

Specular reflection is the type of reflection in which all the incident rays travel in the same direction parallel to one another, and consequently corresponding reflective angles are also the same. This is the kind of reflection that takes place on a plane surface.
Question 3
1 / -0

Which of the following statements is/are false?

a. A pinhole camera can take pictures of fast moving objects.
b. Image in the pinhole camera is always inverted.

A
Both the statements are true.

B
Both the statements are false.

C
Statement 'a' is false and 'b' is true.

D
Statement 'b' is false and 'a' is true.

Solution

This is the correct option as only statement 'a' is false. A pinhole camera can only take pictures of stationary objects.
Question 4
1 / -0

Which among the following is true for a pinhole camera?

A
Has an aperture, but no lens

B
Has a lens, but no aperture

C
Has no lens and no aperture

D
Has a self-timer

E
Has a flash

Solution

A pinhole camera is a camera with a pinhole aperture and no lens.
Question 5
1 / -0

Into which category can a piece of red hot iron be placed?

A
Opaque Object

B
Transparent Object

C
Luminous Object

D
Non-luminous Object

E
Translucent Object

Solution

Any object is considered luminous if it emits its own light, either through stored energy or energy supplied to the object. A piece of red hot iron is an example of a luminous object.
Question 6
1 / -0

Which of the following statements is not true?

A
A cylindrical object can cast a rectangular as well as a circular shadow.

B
Polished surface produces a clear image.

C
The umbra is the region of a shadow which is grey in colour.

D
Light travels in a straight line.

E
Opaque objects cast a shadow.

Solution

The umbra is the dark region of a shadow which is black in colour, while penumbra, which is grey in colour, is the light region of shadow formed around the umbra.
Question 7
1 / -0

In a plane mirror, if an object moves by a distance 'x', then what is the distance moved by the image with respect to the object?

A
2x

B
x

C
x/2

D
x²

Solution

In case of a plane mirror, the distance of the image is always equal to the distance of the object from the mirror.If an object moves a distance 'x' towards the mirror, then the distance moved by the image towards the mirror is 'x'. Hence, the relative separation of the image and the object decreases by 2x or it can be said that the distance moved by the image with respect to the object is 2x.If an object moves a distance 'x' away the mirror, then the distance moved by the image away from the mirror is 'x'. Hence, the relative separation of the image and the object increases by 2x or it can be said that the distance moved by the image with respect to the object is 2x.
Question 8
1 / -0

Which of the following statements is/are false?

a. Planets reflect the light of the Sun falling on them.
b. A non-luminous body can be made a luminous body by cooling it.
c. Anything through which light energy can pass partially or wholly is called an optical medium.

A
Only a

B
Only a and b

C
Only b

D
Only b and c

E
Only c

Solution

A non-luminous body can be made a luminous body by heating it. A non-luminous appears to be luminous when the light is radiates from the luminous body and falls on the non-luminous body.

Question 9

1 / -0

Match the following:

Objects	Property	Examples
(a) Translucent	(i) Allows all light to pass through it	(x) Frosted glass
(b) Opaque	(ii) Allows some light to pass through it	(y) Glass
(c) Transparent	(iii) Allows no light to pass through it	(z) Steel glass

(a) - (iii) - (z); (b) - (ii) - (y); (c) - (i) - (x)

(a) - (i) - (y); (b) - (iii) - (z); (c) - (ii) - (x)

(a) - (ii) - (x); (b) - (i) - (y); (c) - (iii) - (z)

(a) - (ii) - (x); (b) - (iii) - (z); (c) - (i) - (y)

Solution

Translucent objects are the objects that allow some light to pass through them. For example - Frosted glass
Opaque objects are the objects which do not allow the light to through them at all. For example - Steel
Transparent objects are the objects which allow all light to pass through them. For example - Glass

Question 10
1 / -0

A person moves by 1 m towards a plane mirror. By how much distance does his image move towards him?

A
1.5 m

B
1.75 m

C
2 m

D
2.5 m

E
3 m

Solution

In a plane mirror, when an object moves towards the mirror at x meter, the image moves double the distance because the distance between image and object in a plane mirror is equal from the mirror.
Question 11
1 / -0

Which of the following is not a characteristic of a plane mirror?

A
The image and the object are of the same size.

B
The image formed is inverted.

C
The image and the object are at the same distance from the mirror.

D
The image formed is virtual.

E
The image formed is behind the mirror.

Solution

This is the correct option as the image formed by the plane mirror is not inverted but erect.
Question 12
1 / -0

A solar eclipse occurs when the Moon passes between the ________________.

A
Sun and Earth

B
Earth and Mars

C
Sun and Venus

D
Earth and Venus

E
Sun and Mars

Solution

A solar eclipse occurs when the Moon passes between the Sun and Earth, and the Moon fully or partially blocks the sun. Thus, this is the correct answer.
Question 13
1 / -0

A lady is standing in front of a plane mirror at a distance of 1 m from it. She walks 60 cm towards the mirror. The distance of her image now from herself (ignoring the thickness of the mirror) is

A
40 cm

B
60 cm

C
80 cm

D
120 cm

Solution

The image is the same distance behind the mirror as the object is in front of the mirror.
The lady is standing at a distance of 1 m from the mirror, which means 100 cm, and her image also forms at an equal distance behind the mirror.
When she moves 60 cm towards the mirror, the distance between the lady and the mirror is 40 cm, and distance between the lady and her image is 40 + 40 = 80 cm.
Question 14
1 / -0

A pencil of light is incident on a plane mirror and when reflected back, it forms a real image. The pencil of light incident on the plane mirror is

A
parallel

B
converging

C
diverging

D
Data insufficient

Solution

If the image formed by a plane mirror is real, it means that the reflected beam actually converges to form a real image. So, the incident beam should be converging.
Question 15
1 / -0

Two plane mirrors are inclined to each other such that a ray of light incident on the first mirror and parallel to the second is reflected from the second mirror parallel to the first mirror. The angle between the two mirrors is

A
30°

B
45°

C
60°

D
75°

Solution

Let the angle between the two mirrors be θ. The ray of light striking the first mirror is parallel to second mirror, hence, ∠BAC = θ.
The ray after reflection from second mirror becomes parallel to the first mirror, hence it will make angle θ with the mirror, so, ∠BCA = θ.
Hence, in triangle ABC, all the angles are same and equal to θ.
Hence 3θ = 180°
Or θ = 60°

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Re-Attempt Weekly Quiz Competition

Light Shadows And Reflection Test - 10

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Light Shadows And Reflection Test - 10

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SHARING IS CARING

Question 1

The colour of an object determines the colour of the shadow.

The shape of an object determines the size of the shadow.

The distance of an object from the light source determines the size of the shadow.

The density of an object determines the size of the shadow.

Solution

Question 2

Specular reflection

Diffused reflection

Mirror reflection

Lake reflection

Solution

Question 3

Both the statements are true.

Both the statements are false.

Statement 'a' is false and 'b' is true.

Statement 'b' is false and 'a' is true.

Solution

Question 4

Has an aperture, but no lens

Has a lens, but no aperture

Has no lens and no aperture

Has a self-timer

Has a flash

Solution

Question 5

Opaque Object

Transparent Object

Luminous Object

Non-luminous Object

Translucent Object

Solution

Question 6

A cylindrical object can cast a rectangular as well as a circular shadow.

Polished surface produces a clear image.

The umbra is the region of a shadow which is grey in colour.

Light travels in a straight line.

Opaque objects cast a shadow.

Solution

Question 7

2x

x

x/2

x2

Solution

Question 8

Only a

Only a and b

Only b

Only b and c

Only c

Solution

Question 9

(a) - (iii) - (z); (b) - (ii) - (y); (c) - (i) - (x)

(a) - (i) - (y); (b) - (iii) - (z); (c) - (ii) - (x)

(a) - (ii) - (x); (b) - (i) - (y); (c) - (iii) - (z)

(a) - (ii) - (x); (b) - (iii) - (z); (c) - (i) - (y)

Solution

Question 10

1.5 m

1.75 m

2 m

2.5 m

3 m

Solution

Question 11

The image and the object are of the same size.

The image formed is inverted.

The image and the object are at the same distance from the mirror.

The image formed is virtual.

The image formed is behind the mirror.

Solution

x²