physics MCQs - 10th class Chapter 02 Mcqs

1

Sound is a form of which type of energy that travels as waves?

A

Electrical

B

Mechanical

C

Thermal

D

Chemical

2

What is the characteristic of sound that distinguishes between loud and faint sounds?

A

Pitch

B

Quality

C

Loudness

D

Intensity

3

The loudness of a sound is directly proportional to the logarithm of what quantity?

A

Frequency

B

Wavelength

C

Intensity

D

Period

4

What is the unit of sound intensity level that is equal to 10 decibels?

A

Hertz

B

Watt

C

Bel

D

Pascal

5

The sensation of sound persists in the human brain for about how long?

A

1.0 s

B

0.5 s

C

0.1 s

D

0.01 s

6

What is the speed of sound in air at 0°C as mentioned in the text?

A

343 ms⁻¹

B

331 ms⁻¹

C

386 ms⁻¹

D

1290 ms⁻¹

7

Sounds of frequency higher than 20,000 Hz are called what?

A

Infrasound

B

Audible sound

C

Musical sound

D

Ultrasound

8

The technique used to locate underwater objects using sound waves is known as?

A

Radar

B

Laser

C

SONAR

D

Endoscopy

9

Reflection from a smooth surface, where light rays travel in a single direction, is called?

A

Irregular reflection

B

Diffuse reflection

C

Regular reflection

D

Total internal reflection

10

A spherical mirror whose inner curved surface is reflecting is called a?

A

Convex mirror

B

Plane mirror

C

Concave mirror

D

Parabolic mirror

11

The focal length of a spherical mirror is related to its radius of curvature (R) by which formula?

A

f = 2R

B

f = R/2

C

f = R

D

f = R²

12

What is the bending of light as it passes from one transparent medium to another called?

A

Reflection

B

Diffraction

C

Refraction

D

Dispersion

13

The ratio of the speed of light in air to the speed of light in a medium is called?

A

Focal length

B

Refractive index

C

Power

D

Magnification

14

What is the SI unit for the power of a lens?

A

Metre

B

Watt

C

Joule

D

Dioptre

15

A simple microscope is essentially a single?

A

Concave lens

B

Convex lens

C

Plane mirror

D

Concave mirror

16

In a compound microscope, the objective lens has a _______ focal length compared to the eyepiece.

A

longer

B

equal

C

shorter

D

variable

17

Which optical instrument is used to observe distant objects like planets and stars?

A

Microscope

B

Periscope

C

Telescope

D

Kaleidoscope

18

What type of lens is used to correct nearsightedness (myopia)?

A

Converging lens

B

Biconvex lens

C

Plano-convex lens

D

Diverging lens

19

What part of the human eye controls the amount of light reaching the retina?

A

Cornea

B

Lens

C

Iris

D

Pupil

20

The ability of an instrument to distinguish between two closely placed objects is called?

A

Magnifying power

B

Resolving power

C

Focal power

D

Accommodation

21

Sound waves are what type of waves?

A

Transverse

B

Electromagnetic

C

Longitudinal

D

Surface

22

When a tuning fork vibrates, it creates a series of compressions and what in the air?

A

Troughs

B

Crests

C

Rarefactions

D

Amplitudes

23

Which characteristic of sound depends on the frequency?

A

Loudness

B

Intensity

C

Quality

D

Pitch

24

What is the Sl unit of sound intensity?

A

dB

B

Hz

C

Wm⁻²

D

ms⁻¹

25

To hear a distinct echo, the minimum distance from a reflecting surface should be?

A

10 m

B

17 m

C

34 m

D

100 m

26

Noise is a type of sound that has what effect on our ears?

A

Pleasant

B

Musical

C

Jarring and unpleasant

D

Soothing

27

The technique used to absorb undesirable sounds by using soft and porous surfaces is called?

A

Acoustic protection

B

Soundproofing

C

Reverberation

D

Echo cancellation

28

The normal human audible frequency range is between 20 Hz and?

A

2,000 Hz

B

15,000 Hz

C

20,000 Hz

D

35,000 Hz

29

Which part of an optical fibre has a higher refractive index?

A

Cladding

B

Core

C

Sheath

D

Jacket

30

A mirror with its reflecting surface bulging outwards is a?

A

Concave mirror

B

Plane mirror

C

Convex mirror

D

Parabolic mirror

31

According to the mirror formula, 1/f is equal to?

A

1/p - 1/q

B

p + q

C

1/p + 1/q

D

q/p

32

For a convex mirror, the focal length is considered?

A

Positive

B

Negative

C

Zero

D

Infinite

33

Snell's law is represented by which equation?

A

n = c/v

B

v = fλ

C

sin i / sin r = n

D

P = 1/f

34

The critical angle is the angle of incidence in the denser medium for which the angle of refraction is?

A

0°

B

45°

C

90°

D

180°

35

Which of the following instruments uses a right-angled prism to reflect light by 90°?

A

Microscope

B

Telescope

C

Periscope

D

Spectrometer

36

A lens that is thicker at the center and thinner at the edges is a?

A

Concave lens

B

Diverging lens

C

Convex lens

D

Plano-concave lens

37

What is the power of a lens with a focal length of 1 meter?

A

0.5 D

B

1 D

C

2 D

D

10 D

38

In a camera, the image formed on the film is typically?

A

Virtual, erect, and magnified

B

Real, inverted, and diminished

C

Real, erect, and same size

D

Virtual, inverted, and diminished

39

A magnifying glass forms a magnified, virtual, and upright image when the object is placed?

A

At F

B

At 2F

C

Beyond 2F

D

Within F

40

In a refracting telescope, the objective lens has a _______ focal length than the eyepiece.

A

shorter

B

equal

C

longer

D

negative

41

The part of the eye that acts as a light-sensitive layer is the?

A

Cornea

B

Pupil

C

Lens

D

Retina

42

Farsightedness (hypermetropia) is corrected using a?

A

Concave lens

B

Diverging lens

C

Convex lens

D

Cylindrical lens

43

When sound travels from one medium to another, which property remains unchanged?

A

Speed

B

Wavelength

C

Frequency

D

Amplitude

44

A stethoscope works based on the principle of?

A

Reflection of sound

B

Refraction of sound

C

Diffraction of sound

D

Transmission of sound

45

The unit 'decibel' is used to measure?

A

Frequency of sound

B

Speed of sound

C

Intensity level of sound

D

Wavelength of sound

46

Multiple reflections of sound in a large hall that become garbled are called?

A

Echoes

B

Reverberations

C

Acoustics

D

Noise

47

An endoscope uses which principle to transmit light through fibre-optic tubes?

A

Refraction

B

Diffraction

C

Total internal reflection

D

Dispersion

48

The line passing through the two centers of curvature of a lens is called the?

A

Focal length

B

Optical axis

C

Principal axis

D

Aperture

49

When an object is placed at 2F of a convex lens, the image formed is?

A

Real, inverted, and diminished

B

Real, inverted, and same size

C

Real, inverted, and magnified

D

Virtual, upright, and magnified

50

The far point of a normal human eye is at?

A

25 cm

B

50 cm

C

100 cm

D

Infinity