Physics: Hardest Exam! Trivia Quiz

1. The speed of sound travelling in various media increases in the following correct order:

Air, water, iron

Iron, water, air

Water, iron, air

Iron, water, air

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

2. The following objects used in sports and warfare are considered as projectiles except:

Bicycle

Javelin

Bullet

Golf ball

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

3. An object of mass of 2kg moving with a velocity of 3ms^-1 collides head-on with another object of mass 1kg moving in the opposite direction with a velocity of 4ms^-1. If the objects stick together after collision, calculate their common speed.

0.60 ms-1

0.67 ms-1

2.00 ms-1

3.33 ms-1

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

4. The range of a projectile at Ө to the horizontal with a velocity U is given by:

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

5. An object 1cm high is placed in front of a converging lens at a distance of 7.5cm from the lens. If the focal length of the lens is 15cm, find the magnification.

1

2

4

5

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

6. Dispersion of white light by a glass is due to the

Defects in the glass

Different speeds of various colours of light in the glass

Density of the glass

Colour of the glass

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

7. A constant force acts on a body of mass 50kg and reduces the speed from 90ms^-1 to 20ms^-1 in 20s. Calculate the magnitude of the force.

3500N

175N

875N

350N

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

8. Which of the following instruments produces sound by the vibration of air column?

Piano

Guitar

Flute

Talking Drum

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

9. A simple harmonic oscillator has a period of 0.02s and amplitude of 0.25m. Calculate the speed in ms^-1 at the centre of the oscillation.

1.25π

25.00π

100.00π

400.00π

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

10. Sound wave cannot pass through

Solids

Liquids

Vacuum

Gases

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

11. If f represents the principal focus of the objective lens of a compound microscope, the object to be viewed should be placed

At f

Between f and 2f

At 2f

Between f and the objective lens

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

12. A uniform metre rule of mass 0.42kg is balanced at the 60cm mark when a mass m is placed at 90cm mark. Calculate the value of m.

0.14kg

0.42kg

0.82kg

0.84kg

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

13. Primary colours of light are:

Red, Yellow, Green

Red, White, Orange

Red, Blue, Indigo

Red, Blue, Green.

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

14. A simple pendulum with a period of 2.0s has its length doubled. Its new period is

0.35s

1.00s

1.41s

2.83s

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

15. Which of the following will reduce the frequency of oscillation of a simple pendulum?

Decreasing the length of the string.

Increasing the amplitude of oscillation.

Increasing the length of the string.

Increasing the mass of the bob.

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

16. In which of the following is the speed of sound greatest?

Air

Water

Wood

Steel

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

17. Loudness increases as a vibrating tuning fork is brought nearer the end of a pipe containing air column due to

Resonance

Echo

Reverberation

Diffraction

*##*Correct*##*Correct

Explanation

*##*Correct*##*Correct

18. Which of the following is a stringed instruments?

Flute

Trumplet

Piano

Saxophone

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

19. At the beginning of a race, a tyre of volume 8.0 x 10^-4 m³ at 20⁰C has a gas pressure of 4.5 x 10⁵Pa. Calculate the temperature of the gas in the tyre at the end of the race if the pressure has risen to 4.6 x 10⁵Pa.

200C

32.50C

26.50C

50.00C

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

20.

A pipe open at both ends, produces a fundamental note. If the velocity of sound in air is V and Ɩ, the length of the pipe. Which of the following expresses the frequency of the note? (Neglect end – correction).

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

21. Which of the following is/are characteristics of sound? I. Pitch II. Loudness III. Quality IV. Noise

I only

II only

I and II only

I,II and III only

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

22. A tuning fork of frequency 600HZ is sounded over a closed resonance tube. If the first and second resonant positions are 0.130m and 0.413m respectively. Calculate the speed of sound in air.

509.4m/s

480.0m/s

339.6m/s

169.8m/s

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

23. An astronomical telescope with focal length of objective lens, f_o and eye piece lens, f_e is in normal adjustment when the final image is formed at infinity. This because

F0 > fe

F0 < fe

F0 - fe = distance between the two lenses

F0 + fe = distance of the lenses

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

24. When white light is passed through a glass prism, it is broken up into its component colours. This phenomenon is known as:

Reflection

Diffraction

Dispersion

Deviation

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

25. The factor which enables the ear to distinguish between a note played on different instruments is the

Pitch

Speed

Harmonics

Loudness

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

26. At which of the following distances from the lens should a slide be placed in a slide projector if f is the focal length of the projection lens:

Less than f

Greater than 2f

Equal to f

Greater than f but less than 2f

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

27. A lens that is thinner at the middle and thicker at the edges is

Diverging

Converging

Plano-convex

Converging meniscus

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

28. The radius of a wheel is 30.0cm and that of its axle is 6.0cm. Calculate the effort required to lift a load of 120.0N using this machine, assuming 100% efficiency.

600.00N

40.0N

24.0N

20.0N

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

29. Which of the following statements about the 3^rd overtones of a vibrating air column of an open pipe is correct? It has

4 nodes

5 nodes

3 antinodes

4 antinodes

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

30. What part of the camera corresponds to the iris of the eye?

The shutter

The film

The diaphragm

The lens

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

31. A metre rule is found to balance horizontally at the 48cm mark. When a body of mass 60g is suspended at the 6cm mark, the balance point is found to be at the 30cm mark. Calculate the mass of the metre rule.

50g

20g

80g

30g

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

32. A fixed mass of an ideal gas occupies 1000cm³ at 280mmHg and -73⁰C. Determine its volume at 760mmHg and 127⁰C.

1500cm3

1000cm3

870cm3

578cm3

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

33. For correcting long sight defects in the human eye, we require a

Converging lens

Diverging lens

Periscope

Microscope

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

34.

The air column in a resonance tube is set into resonance by a vibrating tuning fork. The resultant waves in the air column will be

Mechanical and transverse

Stationary and longitudinal

Progressive and longitudinal

Stationary and transverse

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

35. For a projectile, the maximum range is obtained when the angle of projectile is:

60°

30°

45°

90°

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

36. An air bubble of volume 4cm³ is formed 20cm under water. What will be its volume when it rises to just below the surface of the water if the atmospheric pressure is equivalent to height of 10cm of water.

2cm3

4cm3

6cm3

12cm3

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

37. A block and tackle system has 6 pulleys. If the efficiency of the machine is 60%, determine its mechanical advantage.

20.0

10.0

3.6

1.8

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

38. Image of a distant object is focused before the retina. What defect is this and with what type of lens can it be corrected?

Short sight, converging lens

Short sight diverging lens

Long sight, converging lens

Long sight, diverging lens

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

39. The ability of the eye to focus object at different distances is called:

Power

Accommodation

Normal vision

Persistence of vision

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

40. Which of the following statements about the frequency of a note is correct? As the frequency decreases,

The velocity increases

The pitch decreases

The strength increases

The loudness decreases.

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

41.

Two simple pendula A and B of equal lengths and masses 5g and 20g are located in the same environment. The periods T_A and T_Bof their respective oscillations are related by the equations

TA= 4TB

TA =1/4TB

TA = TB

TA =5TB

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

42. A block an tackle system has six pulleys. A force of 50N applied to it lifts a load of weight W. If the efficiency of the system is 40%, calculate W.

300N

200N

140N

120N

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

43. If the fundamental frequency of a closed pipe is f_c and that of an open is f₀ then

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

44. Images formed by diverging lenses are always:

Virtual, enlarged & inverted

Virtual, diminished and inverted

Virtual, diminished and erect

Real, diminished and inverted.

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

45. The volume of a given mass of an ideal gas at 327K and 9.52 x 10⁴ Pa is 40cm³. Calculate the volume of the gas at 273K and 034 x 10⁵Pa.

68.23cm3

47.91cm3

44.60cm3

30.75cm3

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

46. Find the focal length of the lens required to correct the defect of vision of a man whose near point is 50cm. Assume the least distance of vision of the normal eye to be 25cm.

50cm

60cm

70cm

80cm

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

47. A metre rule AB is pivoted at mid-point C. If a load of mass 2kg is hung at a point 20cm away from C, the point at which a load of mass 5kg will be hung to balance the rule horizontally is ___.

10.3cm away from C

15.5cm away from A

20.0cm away from B

26.7cm away from C

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

48. A man standing 99m from the foot of a tall cliff claps his hands and hears an echo 0.6s later. Calculate the velocity of sound in air in m/s.

59.4

82.5

270.0

330.0

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

49. A body of mass 80kg moving with a velocity of 6ms^-1hits a stationary body of mass 40kg. If the two bodies stick together after the collision, calculate the magnitude of the velocity with which they move.

4 ms-1

9 ms-1

12 ms-1

16 ms-1

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

50. A plane inclined at an angle of 30⁰ to the horizontal has an efficiency of 60%. A force of magnitude F is used to push a load of 150N up the plane. Calculate F.

45N

75N

125N

360N

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

51. A book which looks red in white light is viewed in magenta light. What colour does it appear?

Red

Blue

Black

White

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

52. A converging lens has a focal length of 5cm. Determine its power.

+20.0D

0.20D

-0.20D

-0.2D

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

53. An effort P applied at one of a crowbar just overcomes the resistance W at the lid of a tin. The mechanical advantage of the crowbar is expressed as

W + P

P – W

W/P

P/W

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

54. The pressure of a certain mass of gas at constant volume increases from 250mmHg at 20⁰C to 400mmHg at 50⁰C. Calculate the pressure expansivity the gas.

0.02C-1

0.05C-1

0.07C-1

0.5C-1

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

55. In a stringed instrument like a guitar or violin, high pitched notes are produced by strings that are:

Thin and short

Thick and short

Thin and long

Thick and long

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

56. When two notes of nearly equal frequencies are sounded together, a periodic rise and fall in sound intensity can be heard. This phenomenon is called

Beats

Diffraction

Overtones

Resonance

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

57. A simple microscope forms an image three times the size of the object. If the focal length of the lens of the microscope is 10cm, how far is the object from the lens?

10cm

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

58. A source of sound produces waves in air of wave length 65m. if the speed of sound in air is 330m/s, the period of vibration in second is

0.005

0.02

0.5

2.

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

59. A body loses X two-fifth of its velocity when it makes a head-on collision with an identical body Y at rest. After the collision Y moves on with a speed of 4ms^-1 in the original direction of X. What is the magnitude of the velocity of X before the collision?

12.5 ms-1

10.0 ms-1

7.5 ms-1

2.0 ms-1

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

60. A uniform metre rule of mass 130g is pivoted at the 55cm mark. An object of mass 20g is used to balance the rule horizontally. Calculate the distance of the object from the pivot.

32.5cm

25.0cm

35.5cm

28.0cm

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

61. A body executing simple harmonic motion has an angular velocity of 40 radians per second. If it has a maximum displacement of 6cm, calculate its linear speed.

666.67ms-1

240.00 ms-1

22.00 ms-1

2.40 ms-1

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

62. An object is projected with a velocity of 100m/s at an angle of 60° to the vertical. Calculate the time taken by the object to reach the highest point. (Take gas 10m/s²)

5.0s

8.7s

10.0s

17.3s

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

63. Which of the following optical instruments does not make use of a lens?

Projector

Periscope

Microscope

Telephone

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

64. A string is stretched tightly between two points 50cm apart. It is plucked at its centre and the velocity of the wave produced is 300m/s. Calculate the number of vibrations made by the string in one second.

3

6

150

300

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

65. A ball is projected horizontally from the top of a hill with a velocity of 20m/s. If it reaches the ground 4seconds later, what is the height of the hill?

20m

40m

80m

160m

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

66. Fuel was consumed at a steady rate of 5.0 x 10^-2kg per second in a rocket engine and ejected as a gas with a speed of 4 x 10³ms^-1. Determine the thrust on the rocket.

20N

80N

200N

800N

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

67. The distance between a node and an antinode for a transverse wave produced by a string is:

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

68. A converging lens of focal length 10cm forms an erect image three times the size of a real object. Calculate the distance between the object and the image.

6.6cm

11.1cm

13.3cm

26.6cm

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

69. The effect produced in the eye by a mixture of purple and green lights is

Green

Bluish green

Yellow

White

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect

70. Masses m₁and m₂at 20cm and 65cm marks respectively of a uniform metre rule freely suspended at its centre of gravity. If the metre rule balances horizontally, determine the ratio m₂: m_1.

2:1

3:3

2:3

1:2

*##*Correct*##*Incorrect

Explanation

*##*Correct*##*Incorrect