O Level And IGCSE Physics MCQ Bank

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1. Which of the following is not a base quantity in the SI system?
A. Mass
B. Length
C. Temperature
D. Force

2. A quantity has units kg·m²/s². This is the unit of:
A. Momentum
B. Force
C. Energy
D. Power

3. Which physical quantity is dimensionless?
A. Refractive index
B. Pressure
C. Charge
D. Acceleration

4. Which is the correct unit for pressure in SI?
A. N·m
B. N/m
C. N/m²
D. kg/m²

5. Which prefix represents the largest quantity?
A. Mega
B. Giga
C. Kilo
D. Centi

6. The SI unit of electric charge is:
A. Ampere
B. Volt
C. Coulomb
D. Ohm

7. Which set consists entirely of derived units?
A. kg, m, s
B. m/s², N, Pa
C. A, K, mol
D. cd, m, s

8. Which physical quantity has the unit kg·m/s²?
A. Power
B. Work
C. Force
D. Energy

9. A student writes: “Joules = kg·m²/s²”. This is equivalent to:
A. Energy
B. Pressure
C. Speed
D. Acceleration

10. The unit of luminous intensity in SI is:
A. Watt
B. Candela
C. Lux
D. Lumen

11. The prefix “nano” corresponds to:
A. 10⁻⁶
B. 10⁻⁹
C. 10⁻³
D. 10⁻¹²

12. The dimension of pressure is:
A. MLT⁻²
B. ML⁻¹T⁻²
C. ML²T⁻³
D. MLT⁻³

13. The SI unit of power is:
A. Newton
B. Pascal
C. Watt
D. Joule

14. 1 atmosphere is approximately:
A. 10⁵ Pa
B. 100 Pa
C. 10⁶ Pa
D. 1 Pa

15. The quantity with units m³/s is:
A. Acceleration
B. Flow rate
C. Volume
D. Density

16. The base SI unit for amount of substance is:
A. Gram
B. Mole
C. Kilogram
D. Atom

17. A Newton can be expressed as:
A. kg·m/s²
B. kg·m²/s²
C. kg/s²
D. m/s²

18. Which of the following is a scalar quantity?
A. Force
B. Displacement
C. Energy
D. Acceleration

19. Which of the following is a correct combination of units for power?
A. N·m
B. J/s
C. kg·m/s
D. W/s

20. A derived SI unit for energy per unit mass is:
A. m²/s²
B. m/s²
C. m³/s
D. kg·m/s²

21. The dimension of kinetic energy is:
A. ML²T⁻²
B. MLT⁻¹
C. MLT⁻²
D. M⁻¹L⁻²T²

22. Which pair has the same dimensions?
A. Momentum and energy
B. Energy and torque
C. Velocity and acceleration
D. Power and energy

23. If velocity = distance/time, what are the units of velocity?
A. m
B. m²/s
C. m/s
D. s/m

24. If a quantity has dimensions ML²T⁻², what is it?
A. Force
B. Energy
C. Pressure
D. Momentum

25. Which of the following conversions is correct?
A. 1 m = 10⁴ mm
B. 1 mm = 10⁻² m
C. 1 km = 10⁵ cm
D. 1 cm = 10⁻² m

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26. Which of these quantities is not a vector?
A. Displacement
B. Velocity
C. Energy
D. Force

27. Which is equivalent to 1 kWh?
A. 3600 J
B. 36,000 J
C. 3.6 × 10⁶ J
D. 3.6 × 10³ J

28. Which of the following physical quantities has SI units of N·m?
A. Power
B. Torque
C. Pressure
D. Energy per unit mass

29. A derived unit for pressure can be written as:
A. N·m²
B. N/m²
C. kg·m²/s
D. m/s²

30. Which prefix means 10⁻³?
A. Milli
B. Micro
C. Nano
D. Centi

31. The base unit of temperature in SI is:
A. Celsius
B. Kelvin
C. Fahrenheit
D. Degree

32. Which of these is a dimensionally correct equation?
A. Force = mass × velocity
B. Energy = force × time
C. Power = work / time
D. Acceleration = velocity × time

33. The unit of electric potential is:
A. Ampere
B. Coulomb
C. Volt
D. Watt

34. If acceleration is in m/s² and mass is in kg, force will be in:
A. kg/s
B. N
C. J
D. kg·m

35. A student records time as 100 ms. This is equal to:
A. 1 s
B. 0.1 s
C. 0.01 s
D. 10 s

36. The unit “pascal” is derived from:
A. kg·m/s²
B. N/m²
C. N·m²
D. m²/s

37. The correct conversion of 5 cm² to m² is:
A. 5 × 10⁻²
B. 5 × 10⁻⁴
C. 5 × 10⁻⁶
D. 5 × 10⁻³

38. The dimensional formula for work done is:
A. ML²T⁻²
B. MLT
C. MT⁻²
D. L²T⁻²

39. Which of the following correctly relates to energy per unit mass?
A. m²/s²
B. m/s²
C. N/m
D. kg·m/s

40. What is the unit for density?
A. kg/m
B. kg/m³
C. kg·m²
D. m²/s

41. Which of the following are all scalar quantities?
A. Speed, temperature, energy
B. Velocity, energy, acceleration
C. Displacement, pressure, force
D. Force, momentum, mass

42. A Joule can also be written as:
A. kg·m/s
B. kg·m²/s²
C. m²/s²
D. N·m/s

43. The base quantity corresponding to the unit mole is:
A. Number of atoms
B. Quantity of matter
C. Relative mass
D. Avogadro constant

44. The ratio of two forces has what unit?
A. N
B. N/N
C. kg·m/s²
D. No unit

45. What is the SI unit for luminous flux?
A. Lux
B. Lumen
C. Watt
D. Candela

46. What is the dimension of power?
A. ML²T⁻²
B. ML²T⁻³
C. MLT⁻³
D. MT⁻²

47. Which of the following equations is dimensionally incorrect?
A. v = u + at
B. s = ut + ½at²
C. F = ma²
D. p = mv

48. A velocity of 72 km/h is equal to:
A. 10 m/s
B. 20 m/s
C. 15 m/s
D. 25 m/s

49. The dimensional formula of impulse is the same as:
A. Force
B. Power
C. Momentum
D. Energy

50. Which one is correctly paired with its base SI unit?
A. Current – Volt
B. Time – Second
C. Luminous Intensity – Lux
D. Pressure – Pascal

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51. Which is the correct relationship between force and momentum?
A. F = p / t
B. F = dp/dt
C. F = p × t
D. F = p² / m

52. Which set of quantities are all measured in joules?
A. Force, Work, Energy
B. Work, Energy, Heat
C. Mass, Energy, Work
D. Power, Work, Heat

53. A quantity expressed in m²·kg/s³ is the unit of:
A. Voltage
B. Force
C. Power
D. Pressure

54. Which derived unit is equivalent to kg·m/s?
A. Power
B. Momentum
C. Force
D. Energy

55. The derived SI unit for electric potential difference is:
A. J/C
B. W·s
C. A·s
D. C/V

56. Which physical quantity corresponds to unit N·m/s?
A. Energy
B. Power
C. Impulse
D. Momentum

57. The SI base unit for frequency is:
A. Second
B. Hertz
C. Cycle
D. Radian

58. One micron is equivalent to:
A. 10⁻⁶ m
B. 10⁻⁹ m
C. 10⁻³ m
D. 10⁻¹² m

59. Which of the following has the dimensional formula MLT⁻³?
A. Force
B. Energy
C. Power
D. Acceleration

60. Which of the following is not a unit of energy?
A. Watt
B. Joule
C. kWh
D. Calorie

61. Which unit is used to measure work done per unit time?
A. Newton
B. Joule
C. Watt
D. Ampere

62. In the SI system, which of the following prefixes represents the smallest value?
A. Milli
B. Micro
C. Nano
D. Pico

63. If F = ma, and m is in grams, what conversion must be done for F to be in Newtons?
A. Divide m by 10
B. Multiply m by 10
C. Convert grams to kg
D. Convert grams to mg

64. 1 m³ equals how many liters?
A. 1000
B. 100
C. 10
D. 1

65. Which of the following physical quantities has the same dimensions as energy?
A. Work
B. Momentum
C. Pressure
D. Power

66. What is the dimensional formula of impulse?
A. MLT
B. MLT⁻²
C. ML²T⁻²
D. MLT⁻¹

67. Which unit is equivalent to volt?
A. J/A
B. J/C
C. A·s
D. W·s

68. Which physical quantity is described by the unit kg·m²/s³·A?
A. Magnetic field strength
B. Electrical power
C. Electric potential
D. Electromotive force

69. What is the SI base unit of length?
A. Metre
B. Millimetre
C. Micron
D. Centimetre

70. Which of the following is not a correct dimensional representation?
A. Acceleration = LT⁻²
B. Energy = ML²T⁻²
C. Pressure = ML⁻¹T⁻²
D. Force = MLT⁻³

71. The physical quantity represented by ML⁻³ is:
A. Density
B. Force
C. Pressure
D. Acceleration

72. Which of the following is equal to one Newton-meter?
A. Watt
B. Joule
C. Pascal
D. Coulomb

73. Which one of the following units is used to express angular frequency?
A. s⁻¹
B. Hz
C. rad/s
D. rev/min

74. The term ‘physical quantity’ refers to:
A. Measurable property
B. Derived units
C. Base units
D. Prefixes

75. What is the correct SI unit for strain (change in length / original length)?
A. N/m
B. No unit
C. m/s
D. m

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76. Which of the following quantities has the unit C·V⁻¹?
A. Resistance
B. Capacitance
C. Current
D. Power

77. The SI derived unit for viscosity (dynamic) is:
A. N·s/m²
B. N/m²
C. kg/s
D. kg·m/s

78. The unit of intensity of sound is:
A. Decibel
B. Watt
C. Watt/m²
D. Pascal

79. The dimensional formula of surface tension is:
A. MT⁻²
B. ML²T⁻³
C. MT⁻³
D. MT⁻²L⁻¹

80. Which set includes only SI base units?
A. kg, m, s, A
B. N, m, s, kg
C. kg, m/s, A, mol
D. J, m, A, cd

81. Which of the following best defines “dimensionally homogeneous equation”?
A. All terms have equal values
B. All terms have same units
C. All terms have same dimensions
D. Units are interchangeable

82. Which of the following is the most accurate expression of energy?
A. N
B. kg·m/s
C. kg·m²/s²
D. m/s²

83. If s = ut + ½at², what is the unit of each term?
A. m/s
B. m
C. m²/s
D. m/s²

84. The unit of gravitational potential is:
A. J
B. N/kg
C. J/kg
D. m²/s²

85. The SI unit of angular momentum is:
A. kg·m²/s
B. kg·m/s
C. m²/s
D. kg/s²

86. What is the SI unit for Young’s Modulus?
A. Pascal
B. Newton
C. m²/s²
D. N·m

87. Which of these represents a unit of energy per unit volume?
A. N/m
B. J/m³
C. W/m²
D. Pa·s

88. Which of the following is a unit of luminous flux?
A. Candela
B. Lumen
C. Lux
D. Watt

89. What is the derived unit of angular acceleration?
A. rad/s
B. rad/s²
C. deg/s
D. Hz

90. Which of the following is not a correct derived unit?
A. Force = N = kg·m/s²
B. Pressure = Pa = N/m²
C. Power = W = J/s
D. Density = kg/m

91. The ratio of power to force is:
A. Time
B. Acceleration
C. Velocity
D. Work

92. Which of the following equations is dimensionally correct?
A. E = qV
B. V = IR²
C. F = ma²
D. p = mv²

93. The SI base unit of electric current is:
A. Coulomb
B. Ampere
C. Volt
D. Watt

94. The dimension of the universal gravitational constant G is:
A. M⁻¹L³T⁻²
B. M⁻²L²T⁻³
C. MLT⁻²
D. MLT

95. What is the unit of electric field strength?
A. V
B. V/m
C. N/C
D. Both B and C

96. If a physical quantity is represented by Q = A²B³/C, and A has units m, B has units s⁻¹ and C has units kg, what are the units of Q?
A. m²·s³/kg
B. m²·s⁻³/kg
C. m²·s⁻³·kg
D. m³·s/kg

97. One electron volt (eV) equals:
A. 1.6 × 10⁻¹⁹ J
B. 1.6 × 10⁻¹⁶ J
C. 1.6 × 10⁻¹⁷ J
D. 1.6 × 10⁻¹⁸ J

98. A dimensional equation that results in ML⁻¹T⁻² represents:
A. Acceleration
B. Force
C. Pressure
D. Energy

99. Which of the following conversions is incorrect?
A. 1 m² = 10⁴ cm²
B. 1 m³ = 1000 liters
C. 1 liter = 1000 cm³
D. 1 cm³ = 0.1 mL

100. What is the unit of resistivity?
A. Ohm·m
B. Ohm/m
C. Ohm·m²
D. Ohm·m⁻¹

Q	Answer	Explanation
1	D	Force is a derived quantity (N = kg·m/s²), not a base quantity.
2	C	kg·m²/s² is the SI unit of energy or work, i.e., Joules.
3	A	Refractive index has no units or dimensions; it’s a ratio.
4	C	Pressure = Force/Area = N/m².
5	B	Giga (10⁹) > Mega (10⁶) > Kilo (10³) > Centi (10⁻²).
6	C	Coulomb (C) is the SI unit of charge.
7	B	All are derived units (acceleration, force, pressure).
8	C	Force = mass × acceleration = kg·m/s².
9	A	Joules (J) are units of energy: kg·m²/s².
10	B	Candela is the base SI unit of luminous intensity.
11	B	Nano = 10⁻⁹.
12	B	Pressure = Force/Area → kg·m/s² ÷ m² = kg/m·s².
13	C	Watt = J/s = power.
14	A	1 atm ≈ 101325 Pa ≈ 10⁵ Pa.
15	B	m³/s is the unit for flow rate (volume/time).
16	B	The base unit of amount of substance is mole.
17	A	N = kg·m/s².
18	C	Energy is scalar, others are vectors.
19	B	Power = energy/time = J/s.
20	A	Energy per unit mass = J/kg = (kg·m²/s²)/kg = m²/s².
21	A	KE = ½mv² → ML²T⁻².
22	B	Energy and torque both = N·m = ML²T⁻².
23	C	Distance/time = m/s = velocity.
24	B	Energy = ML²T⁻².
25	D	1 cm = 0.01 m = 10⁻² m.

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Q	Answer	Explanation
26	C	Energy is scalar; others are vectors.
27	C	1 kWh = 1000 W × 3600 s = 3.6 × 10⁶ J.
28	B	Torque = Force × perpendicular distance = N·m.
29	B	Pressure = Force/Area = N/m².
30	A	Milli = 10⁻³.
31	B	Kelvin (K) is the SI base unit of temperature.
32	C	Power = Work/time is dimensionally correct.
33	C	Volt = J/C.
34	B	kg × m/s² = N.
35	B	100 ms = 100 × 10⁻³ s = 0.1 s.
36	B	Pascal = N/m².
37	C	5 cm² = 5 × (10⁻² m)² = 5 × 10⁻⁴ m².
38	A	Work = Force × distance = ML²T⁻².
39	A	Energy/mass = J/kg = m²/s².
40	B	Density = mass/volume = kg/m³.
41	A	All are scalars.
42	B	Joule = kg·m²/s².
43	B	Mole is the unit for amount of substance.
44	D	Ratio of same units (N/N) has no units.
45	B	Lumen is the unit of luminous flux.
46	B	Power = Energy/time = ML²T⁻³.
47	C	F = ma² is incorrect dimensionally.
48	A	72 km/h = 72,000/3600 = 20 m/s. But trick: Option A is close but answer is 20 m/s (B).
49	C	Impulse = Force × time = same as momentum (MLT⁻¹).
50	B	Time → second (s) is correctly paired.

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Q	Answer	Explanation
51	B	Impulse = dp/dt → F = dp/dt.
52	B	Work, Energy, Heat all measured in joules.
53	A	J/C = V → Power = W = J/s = kg·m²/s³ = m²·kg/s³.
54	B	Momentum = mass × velocity = kg·m/s.
55	A	Volt = J/C.
56	B	Power = Energy/time = N·m/s.
57	B	Hertz = 1/s is derived, base is second, SI is Hz.
58	A	Micron = 1 μm = 10⁻⁶ m.
59	C	Power = Energy/time = ML²T⁻³.
60	A	Watt is unit of power, not energy.
61	C	Power = work/time = Watt.
62	D	Pico = 10⁻¹² < nano < micro < milli.
63	C	Convert grams to kilograms (÷1000) to use SI.
64	A	1 m³ = 1000 liters.
65	A	Energy and work are same dimensionally.
66	D	Impulse = Force × time = MLT⁻¹.
67	B	Volt = J/C.
68	D	EMF = kg·m²/s³·A (derived from P = IV = EMF × I).
69	A	Base unit of length is metre (m).
70	D	Force = MLT⁻², not MLT⁻³.
71	A	Density = mass/volume = M/L³ = ML⁻³.
72	B	Work = N·m = Joule.
73	C	Angular frequency = rad/s.
74	A	Physical quantity = measurable property.
75	B	Strain = change in length/original length = unitless.

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Q	Answer	Explanation
76	B	Capacitance = Q/V = C/V = Farad.
77	A	Viscosity = N·s/m².
78	C	Intensity of sound = W/m².
79	D	Surface tension = Force/length = MT⁻²L⁻¹.
80	A	All are SI base units.
81	C	Dimensions must match on both sides of an equation.
82	C	Energy = kg·m²/s².
83	B	All terms are displacements → units = m.
84	C	Potential = Energy per mass = J/kg.
85	A	Angular momentum = Iω = kg·m²/s.
86	A	Young’s Modulus = stress/strain = Pa.
87	B	Energy/volume = J/m³.
88	B	Lumen = luminous flux unit.
89	B	Angular acceleration = rad/s².
90	D	Density = kg/m³ (not kg/m).
91	C	Power/Force = Energy/time / Force = distance/time = velocity.
92	A	E = qV is dimensionally correct.
93	B	Base SI unit of current is Ampere.
94	A	From F = Gm₁m₂/r² → G = F·r² / m² = M⁻¹L³T⁻².
95	D	Electric field = V/m = N/C = both are correct.
96	B	m² × s⁻³ / kg = m²·s⁻³/kg.
97	A	By definition, 1 eV = 1.6 × 10⁻¹⁹ J.
98	C	Pressure = Force/Area = ML⁻¹T⁻².
99	D	1 cm³ = 1 mL (not 0.1 mL).
100	A	Resistivity = Ohm·meter.