Light Test

Result

Light Test - 32

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Weekly Quiz Competition

Question 1
1 / -0

We can see the objects only when:

A
reflected light from the objects reaches our eyes

B
the objects absorb all the light

C
when the objects allow all the light to pass through them

D
none of the above

Solution

Objects can only be seen when light falls onto the object and is reflected back to our eyes to form an image on the retina.
Question 2
1 / -0

Light shows:

A
Curvilinear propagation

B
Rectilinear propagation

C
Random propagation

D
None of the above

Solution

Light shows Rectilinear propagation.
Rectilinear Propagation of Light is the tendency of light to travel in a straight line.
Question 3
1 / -0

A narrow stream of light is called as :

A
Ray

B
Beam

C
Sunlight

D
None of these

Solution

Ray of light is defined as each of the lines in which light may seem to stream from the sun or any luminous body or pass through a small opening. A narrow beam of light is made up of several rays.
Question 4
1 / -0

A point source of light is placed in front of a plane mirror, then :

A
all the reflected rays will meet at a point when produced backward

B
only the reflected rays close to the normal will meet at a point when produced backward

C
only the reflected rays making a small angle with the mirror will meet at a point when produced backward

D
light of different colours will make different images

Solution

The image of a point source in plane mirror will be a virtual point image, behind the mirror. So the reflected rays should meet at this point when produced backwards.
Question 5
1 / -0

We cannot see anything in a dark room because:

A
everything is black in colour

B
our eyes do not work in darkness

C
light from the room does not reach our eyes

D
all the light gets scattered

Solution

We can only see objects when light falls into are eyes after being reflected from the objects.
Question 6
1 / -0

Which of the following is an example of a self-luminous body?

A
Sun

B
Moon

C
Electric bulb

D
Earth

Solution

Self-luminous bodies are those bodies that produce light of their own.
Sun has its own light.
Question 7
1 / -0

We are able to see objects because

A
they absorb light

B
they reflect light

C
total internal reflection takes place in them

D
all the light is refracted through them

Solution

We can only see objects when light reflected from the objects falls on our eyes.
Question 8
1 / -0

Two mirrors M1 and M2 are placed at right angle to each others as shown. The total number of images of an object 'O' that can be seen are

A
Two

B
Three

C
Four

D
Infinite

Solution

When two plane mirrors are inclined to each other at an angle $$\theta $$ then no. of images formed,

is given by, $$ n = \left ( \dfrac{360^{\circ}}{\theta } -1 \right )$$

now, if $$\dfrac{360^{\circ}}{\theta }$$ is an even integer,

Number of image $$ = \dfrac{360^{\circ}}{90^{\circ} } - 1 = 4 - 1= 3$$
Question 9
1 / -0

Which of the following statements is true?

A
The angle of incidence is twice the angle of reflection

B
The incident ray, the reflected ray and the normal drawn at the point of incidence lie in the same plane

C
Some types of virtual images can be caught on the screens

D
A convex mirror forms real image

Solution

A) The angle of incidence is equal to the angle of reflection.

B) The incident ray, the reflected ray, and the normal drawn at the point of incidence lie in the same plane.

C) Virtual images cannot be caught on the screens.

D) Convex mirrors always form virtual images.
Question 10
1 / -0

If the angle of incidence is $$80^{\circ}$$, what will be the angle of reflection with respect to the normal drawn perpendicular at the point of reflection?

A
$$80^{\circ}$$

B
$$100^{\circ}$$

C
$$160^{\circ}$$

D
$$20^{\circ}$$

Solution

The angle off incidence and the angle of reflection are measured with respect to the normal drawn at the point of reflection.
And, as per laws of reflection, the angle of incidence is equal to the angle of reflection.
So, angle of reflection, with respect to the normal drawn at the point of incidence is $$80^0$$.

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Re-Attempt Weekly Quiz Competition

Light Test - 32

Result

Light Test - 32

Score

-

Rank

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SHARING IS CARING

Question 1

reflected light from the objects reaches our eyes

the objects absorb all the light

when the objects allow all the light to pass through them

none of the above

Solution

Question 2

Curvilinear propagation

Rectilinear propagation

Random propagation

None of the above

Solution

Question 3

Ray

Beam

Sunlight

None of these

Solution

Question 4

all the reflected rays will meet at a point when produced backward

only the reflected rays close to the normal will meet at a point when produced backward

only the reflected rays making a small angle with the mirror will meet at a point when produced backward

light of different colours will make different images

Solution

Question 5

everything is black in colour

our eyes do not work in darkness

light from the room does not reach our eyes

all the light gets scattered

Solution

Question 6

Sun

Moon

Electric bulb

Earth

Solution

Question 7

they absorb light

they reflect light

total internal reflection takes place in them

all the light is refracted through them

Solution

Question 8

Two

Three

Four

Infinite

Solution

Question 9

The angle of incidence is twice the angle of reflection

The incident ray, the reflected ray and the normal drawn at the point of incidence lie in the same plane

Some types of virtual images can be caught on the screens

A convex mirror forms real image

Solution

Question 10

$$80^{\circ}$$

$$100^{\circ}$$

$$160^{\circ}$$

$$20^{\circ}$$

Solution

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