Light Shadows And Reflection Test

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Light Shadows And Reflection Test - 7

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Question 1
1 / -0

Rectilinear propagation of light means that

A
light travels in a straight line

B
light travels in an optical medium

C
light travels in a straight line in a homogeneous medium

D
light travels in a straight line in a heterogeneous medium

Solution

Rectilinear propagation of light means that light travels in a straight line in a homogeneous medium.
Question 2
1 / -0

A tube light is a/an

A
hot source of light

B
cold source of light

C
incandescent source of light

D
None of these

Solution

A tube light is a cold source of light. In a cold source of light, first electricity initiates a chemical reaction and then chemical energy is converted into light energy. In a hot source of light, electrical energy is converted into heat energy and then heat energy is converted into light energy.
Question 3
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Directions: In this question, two statements A and B are given. Read the two statements carefully and choose the correct option accordingly.

Statement A: We cannot see our image in the mirror in a completely dark room because there is no light to reflect.
Statement B: We cannot see objects through a T-shaped pipe because light travels in a straight line.

A
Only statement A is correct.

B
Only statement B is correct.

C
Both statements A and B are incorrect.

D
Both statements A and B are correct.

Solution

Both statements A and B are correct.
We can see an object if it reflects the light and hence, we can say that if there is no light, we cannot see the object.
Light always travels in a straight line, that is why we cannot see the objects through a T-shaped pipe.
Question 4
1 / -0

What is/are the essential condition(s) to form a shadow?

(a) The object should be in a dark room.
(b) The object must be placed in the path of light.
(c) There should be a source of light and a screen.
(d) The object must be a luminous object.

A
Only (b) and (a)

B
Only (b) and (c)

C
Only (a) and (c)

D
Only (a) and (d)

Solution

For the formation of a shadow, there should be a source and a screen, and also the object must be placed in between the source and the screen.
Question 5
1 / -0

A shadow moves on the screen when

A. the source moves parallel to the screen
B. the object moves parallel to the screen
C. the source moves away from the screen
D. colour of the source light changes

A
A and B

B
B and C

C
C and D

D
A, B and C

Solution

A shadow moves on the screen whenever the source or the object moves parallel to the screen. When the source moves away from the screen, the size of the shadow changes but position of the shadow remains unchanged. Colour of the light does not affect the size and movement of the shadow.
Question 6
1 / -0

Which of the following statements is/are false?

(a) Pinhole camera produces an erect image.
(b) Pinhole camera produces a shadow.
(c) Pinhole camera produces an image.
(d) Pinhole camera produces an inverted image.

A
(a) and (b)

B
(a) and (c)

C
(b) and (c)

D
(c) and (d)

Solution

Pinhole camera produces real, inverted and diminished image; so statements (a) and (b) are incorrect.
Question 7
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Directions: Study the given text and answer the following question.

When we pass under a tree covered with large number of leaves, we notice small patches of sunlight under it. These circular images are, in fact, pinhole images of the Sun. The gaps between the leaves act as the pinholes. These gaps are all kinds of irregular shapes, but we can see circular images of the Sun. This is called a natural pinhole camera.

Which of the following is/are true about a natural pinhole camera?

A
The circular patches of light formed on the ground are kind of images.

B
The circular patches are pinhole images of the Sun.

C
We see circular images of the Sun irrespective of the irregular shapes of the gaps between the leaves.

D
All of the above

Solution

All the given statements are correct about a pinhole camera.

1.The circular patches of light formed on the ground are kind of images.
2.The circular patches are pinhole images of the Sun.
3.We see circular images of the Sun irrespective of the irregular shapes of the gaps between the leaves.
Question 8
1 / -0

If a ray of light is incident on a plane mirror at an angle of 20°with the mirror, then what will be the angle of reflection?

A
0°

B
70°

C
20°

D
90°

Solution

Angle of incidence, i = 90° - 20° = 70°
Now, we know:
Angle of incidence = Angle of reflection
Hence, angle of reflection = 70°
Question 9
1 / -0

John is 130 cm tall and standing at a distance of 3 m from a plane mirror. What is the distance between John and his image?

A
3 m

B
6 m

C
1.5 m

D
9 m

Solution

As the object distance and the image distance are the same, therefore the distance between John and his image is 6 m.
Question 10
1 / -0

A plane mirror is cut horizontally to half its height. The image of an object formed in the plane mirror will be

(a) upright
(b) real
(c) as far behind as the object is in front of it

A
Only a

B
Only b

C
Only a and b

D
Only a and c

Solution

A plane mirror always forms an imaginary and erect image, and the distance of the image from the mirror is always equal to the distance of the object from the mirror.
Question 11
1 / -0

Observe the picture given below:

A patch of light is obtained at B, when the torch is shown as above. Which of the following is kept at A to get this patch of light?

A
A wooden board

B
A glass sheet

C
A mirror

D
A sheet of white paper

Solution

A mirror can be used as a good reflecting surface.
Question 12
1 / -0

What is the value of θ in the following figure?

A
30°

B
50°

C
60°

D
75°

Solution

We know:
Angle of incidence = Angle of reflection
So, ∠ABD = 30°
Hence, ∠CBD = (90° - 30°) = 60°
For the triangle BCD:
∠BDC = 180° - (90° + 60°) = 30°
Hence, ∠BDE = 60°, so θ = 60°.
Question 13
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 14
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 15
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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 16
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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

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 17
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 18

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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 19
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 20
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.

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Light Shadows And Reflection Test - 7

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Light Shadows And Reflection Test - 7

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Question 1

light travels in a straight line

light travels in an optical medium

light travels in a straight line in a homogeneous medium

light travels in a straight line in a heterogeneous medium

Solution

Question 2

hot source of light

cold source of light

incandescent source of light

None of these

Solution

Question 3

Only statement A is correct.

Only statement B is correct.

Both statements A and B are incorrect.

Both statements A and B are correct.

Solution

Question 4

Only (b) and (a)

Only (b) and (c)

Only (a) and (c)

Only (a) and (d)

Solution

Question 5

A and B

B and C

C and D

A, B and C

Solution

Question 6

(a) and (b)

(a) and (c)

(b) and (c)

(c) and (d)

Solution

Question 7

The circular patches of light formed on the ground are kind of images.

The circular patches are pinhole images of the Sun.

We see circular images of the Sun irrespective of the irregular shapes of the gaps between the leaves.

All of the above

Solution

Question 8

0°

70°

20°

90°

Solution

Question 9

3 m

6 m

1.5 m

9 m

Solution

Question 10

Only a

Only b

Only a and b

Only a and c

Solution

Question 11

A wooden board

A glass sheet

A mirror

A sheet of white paper

Solution

Question 12

30°

50°

60°

75°

Solution

x²