| Question (1):
Light is a form of energy produced by a ______.
|
| 1. |
luminous object
|
| 2. |
transparent object
|
| 3. |
non-luminous object
|
| 4. |
opaque object
|
|
| Ans: 1 |
|
| Question (2):
An example for non-luminous object is ___________.
|
| 1. |
a candle
|
| 2. |
the sun
|
| 3. |
an electric bulb
|
| 4. |
the moon
|
|
| Ans: 4 |
|
| Question (3):
The phenomenon by which the incident light falling on a surface is sent back into the same medium is known as ________.
|
| 1. |
polarization
|
| 2. |
reflection
|
| 3. |
refraction
|
| 4. |
absorption
|
|
| Ans: 2 |
|
| Question (4):
When light is incident on a polished surface ___________ reflection takes place.
|
| 1. |
regular
|
| 2. |
irregular
|
| 3. |
diffused
|
| 4. |
normal
|
|
| Ans: 1 |
|
| Question (5):
An object becomes invisible when it undergoes ______ reflection.
|
| 1. |
regular
|
| 2. |
irregular
|
| 3. |
diffused
|
| 4. |
normal
|
|
| Ans: 1 |
|
| Question (6):
According to the laws of reflection, |
| 1. |
 i =  r
|
| 2. |
 i >  r
|
| 3. |
 r >  i
|
| 4. |
 |
|
| Ans: 1 |
|
| Question (7):
The image formed by a plane mirror is always _______.
|
| 1. |
real and erect
|
| 2. |
virtual and erect
|
| 3. |
real and inverted
|
| 4. |
virtual and inverted
|
|
| Ans: 2 |
|
| Question (8):
The centre of the sphere of which the spherical mirror forms a part is called ____________.
|
| 1. |
centre of curvature
|
| 2. |
focus
|
| 3. |
pole
|
| 4. |
vertex |
|
| Ans: 1 |
|
| Question (9):
The focus of a concave mirror is ________.
|
| 1. |
real
|
| 2. |
virtual
|
| 3. |
undefined
|
| 4. |
at the pole
|
|
| Ans: 2 |
|
| Question (10):
A converging mirror is known as ________.
|
| 1. |
convex mirror
|
| 2. |
plane mirror
|
| 3. |
concave mirror
|
| 4. |
cylindrical mirror
|
|
| Ans: 3 |
|
| Question (11):
The relation between the focal length and radius of curvature of a mirror is _______.
|
| 1. |
|
| 2. |
R + 2 = f
|
| 3. |
f = R/2
|
| 4. |
f = 2 R
|
|
| Ans: 3 |
|
| Question (12):
Radius of curvature of a concave mirror is always _____ to the mirror.
|
| 1. |
parallel
|
| 2. |
perpendicular
|
| 3. |
inclined at 60o |
| 4. |
inclined at 45o |
|
| Ans: 2 |
|
| Question (13):
An image formed by a convex mirror is always ________.
|
| 1. |
virtual, erect and diminished
|
| 2. |
virtual, real and magnified
|
| 3. |
real, inverted and diminished
|
| 4. |
real, erect and magnified
|
|
| Ans: 1 |
|
| Question (14):
If the image formed by a concave mirror is virtual, erect and magnified, then the object is placed __________.
|
| 1. |
between the pole of the mirror and the focus
|
| 2. |
beyond the centre of curvature
|
| 3. |
at the centre of curvature
|
| 4. |
at the focus
|
|
| Ans: 1 |
|
| Question (15):
Dentists use a _____________ to focus light on the tooth of a patient.
|
| 1. |
concave mirror
|
| 2. |
convex mirror
|
| 3. |
plane mirror
|
| 4. |
cylindrical mirror
|
|
| Ans: 1 |
|
| Question (16):
An object is placed 1.5 m from a plane mirror. How far is the image from the person?
|
| 1. |
3 m
|
| 2. |
1.5 m
|
| 3. |
2 m
|
| 4. |
1 m
|
|
| Ans: 1 |
|
| Question (17):
An object placed 2m from a plane mirror is shifted by 0.5 m away from the mirror. What is the distance between the object and its image?
|
| 1. |
2 m
|
| 2. |
1.5 m
|
| 3. |
5 m
|
| 4. |
3 m
|
|
| Ans: 3 |
|
Question (18):
What is the value of q in the following diagram?
 |
| 1. |
30o
|
| 2. |
45o
|
| 3. |
90o |
| 4. |
60o |
|
| Ans: 4 |
|
| Question (19):
What is the angle between the incident and reflected rays when a ray of light is incident normally on a plane mirror?
|
| 1. |
90o
|
| 2. |
45o
|
| 3. |
180o |
| 4. |
0
|
|
| Ans: 4 |
|
| Question (20):
Name the type of image that can be obtained on a screen.
|
| 1. |
Virtual
|
| 2. |
Real
|
| 3. |
Diverging
|
| 4. |
Converging
|
|
| Ans: 2 |
|
| Question (21):
A ray of light is incident on a plane mirror and the angle of incidence is 25o. What is the angle of reflection?
|
| 1. |
0
|
| 2. |
50o
|
| 3. |
90o |
| 4. |
25o |
|
| Ans: 4 |
|
| Question (22):
A ray of light is incident on a plane mirror and the angle of reflection is 50o. Calculate the angle between the incident ray and the reflected ray.
|
| 1. |
50o
|
| 2. |
25o
|
| 3. |
90o |
| 4. |
100o |
|
| Ans: 4 |
|
| Question (23):
Which of the following is used to make a periscope?
|
| 1. |
Concave mirror
|
| 2. |
Convex mirror
|
| 3. |
Plane mirror
|
| 4. |
Lens
|
|
| Ans: 3 |
|
| Question (24):
Which mirror has a wider field of view?
|
| 1. |
Convex mirror
|
| 2. |
Concave mirror
|
| 3. |
Plane mirror
|
| 4. |
Cylindrical mirror
|
|
| Ans: 1 |
|
| Question (25):
The focal length of a concave mirror is 15 cm. What is its radius of curvature?
|
| 1. |
15 cm
|
| 2. |
30 cm
|
| 3. |
7.5 cm
|
| 4. |
45 cm
|
|
| Ans: 2 |
|
| Question (26):
The focal length of a mirror is 15 cm. Identify the type of mirror.
|
| 1. |
Concave mirror
|
| 2. |
Plane mirror
|
| 3. |
Convex mirror
|
| 4. |
Cylindrical mirror
|
|
| Ans: 3 |
|
| Question (27):
A ray of light passing through the _______ retraces its path.
|
| 1. |
focus
|
| 2. |
centre of curvature
|
| 3. |
pole
|
| 4. |
vertex
|
|
| Ans: 2 |
|
| Question (28):
When an object is placed at the focus of a concave mirror, the image will be formed at ________.
|
| 1. |
infinity
|
| 2. |
focus
|
| 3. |
centre of curvature
|
| 4. |
pole
|
|
| Ans: 1 |
|
| Question (29):
Butter paper is an example for _______ object.
|
| 1. |
a transparent
|
| 2. |
a translucent
|
| 3. |
an opaque
|
| 4. |
a luminous
|
|
| Ans: 2 |
|
| Question (30):
An object of size 2.0 cm is placed perpendicular to the principal axis of a concave mirror. The distance of the object from the mirror equals to the radius of curvature. The size of the image will be ______________. |
| 1. |
0.5 cm
|
| 2. |
1.5 cm
|
| 3. |
1.0 cm |
| 4. |
2.0 cm |
|
| Ans: 4 |
|
| Question (31):
If an incident ray passes through the centre of curvature of a spherical mirror, the reflected ray will __________________. |
| 1. |
pass through the focus
|
| 2. |
pass through the centre of curvature
|
| 3. |
pass through the pole |
| 4. |
retrace its path |
|
| Ans: 4 |
|
