1.
An electron beam can be deflected by:
A
Electric field only
B
Magnetic field only
C
Both electric and magnetic fields
D
Gravitational field
2.
Which wave property determines the color of light?
A
Amplitude
B
Frequency
C
Speed
D
Intensity
3.
Which radiation is most dangerous inside the human body?
A
Alpha
B
Beta
C
Gamma
D
X-rays
4.
Which scattering is responsible for the blue color of the sky?
A
Mie scattering
B
Rayleigh scattering
C
Compton scattering
D
Photoelectric scattering
5.
Which phenomenon proves the particle nature of light?
A
Diffraction
B
Interference
C
Photoelectric effect
D
Refraction
6.
Why clouds appear white?
A
Due to absorption
B
Due to reflection of blue light
C
Due to scattering of all wavelengths
D
Due to refraction
7.
The rule used to find direction of force on a conductor is:
A
Right hand thumb rule
B
Fleming’s left hand rule
C
Fleming’s right hand rule
D
Maxwell’s rule
8.
Electromagnetic induction was discovered by:
A
Oersted
B
Faraday
C
Ampere
D
Tesla
9.
In an ideal transformer, power input is:
A
Less than output
B
Greater than output
C
Equal to output
D
Zero
10.
Mass number of an atom is equal to:
A
Protons only
B
Neutrons only
C
Protons + electrons
D
Protons + neutrons
11.
The SI unit of radioactivity is:
A
Gray
B
Sievert
C
Becquerel
D
Curie
12.
Which decay results in the emission of an electron?
A
Alpha decay
B
Beta decay
C
Gamma decay
D
Fusion
13.
An electromagnet becomes stronger when:
A
Current is reduced
B
Number of turns is increased
C
Wire is made thinner
D
Battery is removed
14.
Which electromagnetic waves are used in satellite communication?
A
Ultraviolet rays
B
Microwaves
C
X-rays
D
Gamma rays
15.
Dark matter is believed to:
A
Emit light
B
Absorb light
C
Have gravitational effects
D
Be visible
16.
Which is NOT a source of background radiation?
A
Cosmic rays
B
Rocks
C
Soil
D
Radio waves
17.
Microwaves are commonly used for
A
Cooking food
B
Medical imaging
C
Sterilization
D
Photography
18.
The strength of magnetic field around a current carrying wire depends on:
A
Length of wire
B
Material of wire
C
Current through the wire
D
Color of wire
19.
The magnetic field around a straight current carrying conductor consists of:
A
Straight lines
B
Circular lines
C
Elliptical lines
D
Random lines
20.
Background radiation mainly comes from:
A
Television
B
Natural sources
C
Mobile phones
D
Electric wires