1.
The visible spectrum lies between:
A
Infrared and ultraviolet
B
X-rays and gamma rays
C
Microwaves and radio waves
D
Ultraviolet and X-rays
2.
SI unit of electric field is:
A
Volt
B
Newton
C
Newton per coulomb
D
Coulomb
3.
Hypermetropia is corrected using:
A
Concave lens
B
Convex lens
C
Plane mirror
D
Prism
4.
Which law of reflection states that the angle of incidence is equal to the angle of reflection?
A
First law of reflection
B
Second law of reflection
C
Law of refraction
D
Snell’s law
5.
Which condition favors electrical breakdown?
A
Low electric field
B
High electric field
C
Low temperature
D
Low charge
6.
Which statement is correct?
A
Charge can be created
B
Charge can be destroyed
C
Charge is conserved
D
Charge depends on mass
7.
Which gas is commonly used in fluorescent tubes?
A
Oxygen
B
Nitrogen
C
Neon
D
Carbon dioxide
8.
Which mirror is used as a rear-view mirror in vehicles?
A
Concave mirror
B
Plane mirror
C
Convex mirror
D
Parabolic mirror
9.
Charging a body without touching it is called:
A
Charging by friction
B
Charging by conduction
C
Charging by induction
D
Charging by earthing
10.
Electric field lines start from:
A
Negative charges
B
Positive charges
C
Neutral bodies
D
Earth
11.
Lightning is an example of:
A
Magnetic force
B
Electrical breakdown
C
Current electricity
D
Chemical reaction
12.
Which color has the shortest wavelength in the visible spectrum?
A
Red
B
Green
C
Blue
D
Violet
13.
Electrical breakdown of air occurs when:
A
Air becomes cold
B
Electric field exceeds a critical value
C
Humidity increases
D
Pressure decreases
14.
Static charges are produced mainly by:
A
Chemical reactions
B
Friction
C
Heating
D
Radiation
15.
The angle between the incident ray and the normal is called:
A
Angle of reflection
B
Angle of deviation
C
Angle of incidence
D
Critical angle
16.
Which object cannot be charged easily?
A
Metal rod
B
Plastic rod
C
Glass rod
D
Rubber rod
17.
Which application uses electrostatics?
A
Electric motor
B
Photocopier
C
Transformer
D
Generator
18.
Divergence of gold leaves indicates:
A
No charge
B
Presence of charge
C
Loss of charge
D
Magnetic effect
19.
A lens with focal length 0.5 m has power:
A
0.5 D
B
2 D
C
–2 D
D
–0.5 D
20.
Which instrument uses lenses to view very small objects?
A
Telescope
B
Periscope
C
Microscope
D
Camera obscura