Olympiad Science - Light
Exam Duration: 45 Mins Total Questions : 30
Which of the following is used for splitting sunlight into seven colours?
- (a)
A prism
- (b)
A plane mirror
- (c)
A concave mirror
- (d)
A convex lens
Which of the following is a natural source of light?
- (a)
Electric lamp
- (b)
Tube light
- (c)
Torch
- (d)
The sun
What is the nature of the propagation of light?
- (a)
Curvilinear
- (b)
Rectilinear
- (c)
Random
- (d)
Circular
What is rectilinear propagation of light?
- (a)
Travelling in curved lines
- (b)
Travelling in straight lines
- (c)
The ability to bend around obstacles
- (d)
The display of the phenomenon of diffraction
What is called a source of light?
- (a)
An object that can absorb light
- (b)
An object that can reflect light
- (c)
An object that can refract light
- (d)
An object that can emit light
What causes the formation of shadows?
- (a)
Rectilinear propagation of light
- (b)
Curvilinear propagation of light
- (c)
Total internal reflection
- (d)
Refraction
Identify the nature of light emitted from a torchlight.
- (a)
Convergent
- (b)
Divergent
- (c)
Parallel
- (d)
irregular
What is a stream of light called?
- (a)
Ray
- (b)
Beam
- (c)
Twilight
- (d)
Sunlight
A ray of light is incident on a plane mirror at an angle of incidence of 30°. What is the angle of reflection?
- (a)
30°
- (b)
60°
- (c)
90°
- (d)
120°
How many colours is white light made up of?
- (a)
A single colour
- (b)
Primary colours
- (c)
Five colours
- (d)
Seven Colours
Why can't we see anything in a dark room?
- (a)
Everything is black in colour.
- (b)
Our eyes do not work in darkness.
- (c)
No light reaches our eyes.
- (d)
All the light gets scattered.
Which of these surfaces cannot produce clear images?
- (a)
Rough surface
- (b)
Ideal surface
- (c)
Smooth surface
- (d)
Curved- surface
What enables us to see objects?
- (a)
Light absorbed by an object
- (b)
Light that enters our eyes after it is reflected by an object
- (c)
Light dispersed by an object
- (d)
Light refracted through the object
Which of the following is used by an E.N.T. doctor?
- (a)
Convex mirror
- (b)
Convex lens
- (c)
Plane mirror
- (d)
Concave mirror
If the angle of incidence is 50°/what is the angle between the incident ray and the reflected ray?
- (a)
50°
- (b)
100°
- (c)
130°
- (d)
80°
Which of the following are used in projectors?
- (a)
Concave lens
- (b)
Convex mirrors
- (c)
Plane mirrors
- (d)
Convex lenses
Which of the following are used as reflectors in torchlights?
- (a)
Concave mirrors
- (b)
Plane mirrors
- (c)
Convex mirrors
- (d)
Concave lens
To prevent the mirror from getting scratched/ which colour is painted at the back of the mirror?
- (a)
Red
- (b)
Yellow
- (c)
Blue
- (d)
Green
Which of the following can form enlarged, virtual images?
- (a)
Convex mirrors
- (b)
Concave mirrors
- (c)
Plane mirrors
- (d)
Concave lens
What is a spherical mirror?
- (a)
A reflecting, elliptical surface
- (b)
A reflecting, spherical surface
- (c)
A reflecting, parabolic surface
- (d)
A flat, reflecting surface
A reflecting surface is curved outwards. Which of the following mirrors is it likely to be?
- (a)
Concave
- (b)
Plane
- (c)
Convex
- (d)
All of the above
Why are convex mirrors used by drivers as rear view mirrors in vehicles?
- (a)
They reflect light better than other mirrors.
- (b)
They produce images which are clearer than those produced by others.
- (c)
They produce magnified images.
- (d)
They give a wide field of view
Why are images inverted in a pinhole camera?
- (a)
Light travels in straight lines.
- (b)
Images are always inverted.
- (c)
mage gets inverted when the light travels through a hole.
- (d)
There is 110 specific reason
An object placed 3 m from a plane mirror is shifted by 0.4 m away from the mirror. What is the new distance between the object and its image?
- (a)
6.4 m
- (b)
6.8 m
- (c)
6 m
- (d)
5.2 m
Which of the following is NOT a characteristic feature of a convex mirror
- (a)
The image lies between the pole and focus.
- (b)
The image is diminished in size.
- (c)
The image is erect.
- (d)
The image is real.
The figure given below shows an image produced by an object placed in front of a plane mirror.
Which is the object from among the following?
- (a)
- (b)
- (c)
- (d)
The image produced by Q is real. Identify Q from the following.
- (a)
Plane mirror
- (b)
Convex lens
- (c)
Concave lens
- (d)
Convex mirror
How many letters in the English alphabets have the image formed in a plane mirror appear exactly like the letter itself?
- (a)
4
- (b)
8
- (c)
9
- (d)
11
Match the entries given in Column-I with those in Column-II.
Column I | Column II |
a. Plane mirror | 1.Used as a magnifying glass |
b. Convex mirror | 2.Can form images of objects spread over a large area |
c. Convex lens | 3.Used by dentists to see enlarged images of teeth |
d. Concave mirror | 4.Image is erect and of the same size as the object |
e. Concave lens | 5.The image is erect and smaller than the object |
- (a)
a - 4, b - 5, c - 3, d - 1, e - 2
- (b)
a - 4, b - 5, c - l d - 3, e - 2
- (c)
a - 4, b - 3, c - 2, d - 5, e - l
- (d)
a - 4, b - 1, c - 3, d - 2, e - 5
Which of the following letters will be seen without any change in a plane mirror?
- (a)
S
- (b)
T
- (c)
L
- (d)
P