Light Shadows and Reflection Test

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Light Shadows and Reflection Test - 2

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Weekly Quiz Competition

Question 1
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 2
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

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 3
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.

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 4
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

Solution

Option 3 is correct as statement 'b' is false. A non-luminous body can be made a luminous body by heating it.
Question 5
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 6

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 7
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.

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Re-Attempt Weekly Quiz Competition

Light Shadows and Reflection Test - 2

Result

Light Shadows and Reflection Test - 2

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SHARING IS CARING

Question 1

Specular reflection

Diffused reflection

Mirror reflection

Lake reflection

Solution

Question 2

Opaque Object

Transparent Object

Luminous Object

Non-luminous Object

Solution

Question 3

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.

Solution

Question 4

Only a

Only a and b

Only b

Only b and c

Solution

Question 5

2x

x

x/2

x2

Solution

Question 6

(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 7

40 cm

60 cm

80 cm

120 cm

Solution

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