1.
Echo is an example of:
A
Refraction
B
Reflection
C
Diffraction
D
Interference
2.
Which mirror is used as a rear-view mirror in vehicles?
A
Concave mirror
B
Plane mirror
C
Convex mirror
D
Parabolic mirror
3.
Auditory nerve carries signals to:
A
Heart
B
Lungs
C
Brain
D
Eye
4.
Which formula relates focal length, image distance, and object distance of a lens?
A
Magnification formula
B
Lens maker’s formula
C
Lens formula
D
Mirror formula
5.
Unit of electric charge is:
A
Ampere
B
Volt
C
Coulomb
D
Ohm
6.
Eardrum is also known as:
A
Cochlea
B
Tympanic membrane
C
Oval window
D
Semicircular canal
7.
Which device protects buildings from lightning?
A
Transformer
B
Lightning rod
C
Fuse
D
Circuit breaker
8.
Hypermetropia is corrected using:
A
Concave lens
B
Convex lens
C
Plane mirror
D
Prism
9.
The image formed on the retina of the human eye is:
A
Virtual and erect
B
Real and inverted
C
Virtual and inverted
D
Real and erect
10.
The part of ear that collects sound waves is:
A
Cochlea
B
Auditory nerve
C
Ear canal
D
Pinna
11.
In a convex lens, parallel rays of light after refraction meet at:
A
Center of curvature
B
Optical center
C
Principal focus
D
Pole
12.
Which factor does electric field strength depend on?
A
Charge only
B
Distance only
C
Charge and distance
D
Mass
13.
Minimum distance for hearing echo in air is about:
A
5 m
B
10 m
C
17 m
D
50 m
14.
Sound cannot travel through:
A
Air
B
Water
C
Steel
D
Vacuum
15.
Which lens is used to correct myopia (short-sightedness)?
A
Convex lens
B
Concave lens
C
Bifocal lens
D
Cylindrical lens
16.
The distance between two consecutive compressions is called:
A
Amplitude
B
Frequency
C
Wavelength
D
Pitch
17.
Reflection of sound follows the law of:
A
Refraction
B
Diffraction
C
Reflection
D
Interference
18.
Which type of mirror always forms a virtual, erect, and diminished image?
A
Concave mirror
B
Convex mirror
C
Plane mirror
D
Parabolic mirror
19.
The unit of focal length is:
A
Dioptre
B
Meter
C
Watt
D
Second
20.
The power of a lens is measured in:
A
Watt
B
Dioptre
C
Meter
D
Candela