100 Most Repeated A/L Physics MCQ Questions With Answers (2026 Edition)

Physics is one of the most challenging subjects in the Sri Lankan G.C.E Advanced Level examination. However, a careful analysis of past papers shows that certain concepts and question patterns appear repeatedly.

In this guide, we have compiled 100 of the most important and frequently repeated Physics MCQ concepts to help students prepare effectively for the examination.

Section 1: Mechanics (MCQ 1-20)

MCQ 1

A body moves with constant acceleration. Which graph represents uniform acceleration?

A) Curved v-t graph
B) Straight-line v-t graph
C) Horizontal d-t graph
D) Random graph

Answer: B

Straight-line v-t graph = constant acceleration.

MCQ 2

The SI unit of force is:

A) Joule
B) Newton
C) Pascal
D) Watt

Answer: B

MCQ 3

Newton's First Law states:

A) Force causes motion
B) a ∝ F
C) Body at rest/uniform motion stays unless acted upon
D) Momentum conserved

Answer: C

MCQ 4

Momentum =

A) mv
B) ma
C) Fd
D) mgh

Answer: A

MCQ 5

Impulse equals:

A) Change in momentum
B) Work done
C) Power
D) Force

Answer: A

MCQ 6

Kinetic energy formula:

A) ½mv²
B) mv
C) mgh
D) Fd

Answer: A

MCQ 7

Potential energy near Earth:

A) ½mv²
B) mgh
C) mv
D) Fd

Answer: B

MCQ 8

Work done formula:

A) Fd cosθ
B) mv
C) mgh
D) ½mv²

Answer: A

MCQ 9

The SI unit of power is:

A) Joule
B) Newton
C) Watt
D) Pascal

Answer: C

MCQ 10

Conservation of momentum applies when:

A) No external force
B) No friction
C) Elastic collision only
D) Always

Answer: A

MCQ 11

A ball thrown upward at 20 m/s. Maximum height? (g=10m/s²)

A) 10m
B) 20m
C) 30m
D) 40m

Answer: B (h = v²/2g = 400/20 = 20m)

MCQ 12

Friction force direction is always:

A) Same as motion
B) Opposite to motion
C) Perpendicular
D) Upward

Answer: B

MCQ 13

Newton's Second Law formula:

A) F=ma
B) F=mv
C) F=md
D) F=mt

Answer: A

MCQ 14

Inelastic collision: kinetic energy is:

A) Conserved
B) Not conserved
C) Zero
D) Doubled

Answer: B

MCQ 15

Acceleration due to gravity is maximum at:

A) Equator
B) Poles
C) Mountain top
D) Centre of Earth

Answer: B

MCQ 16

If mass doubles, kinetic energy at same velocity:

A) Doubles
B) Halves
C) Quadruples
D) Same

Answer: A

MCQ 17

Tension in a string is a type of:

A) Contact force
B) Field force
C) Fictional force
D) Nuclear force

Answer: A

MCQ 18

A couple produces:

A) Translation only
B) Rotation only
C) Both
D) Neither

Answer: B

MCQ 19

Torque =

A) F × d
B) F × v
C) m × a
D) F × t

Answer: A

MCQ 20

Equilibrium requires net force and net torque to be:

A) Maximum
B) Zero
C) Equal
D) Opposite

Answer: B

Section 2: Circular Motion (MCQ 21-28)

MCQ 21

Centripetal force acts:

A) Outward
B) Tangentially
C) Towards center
D) Upward

Answer: C

MCQ 22

Centripetal acceleration formula:

A) v²/r
B) v/r
C) vr
D) r/v²

Answer: A

MCQ 23

Angular velocity unit:

A) m/s
B) rad/s
C) Hz
D) N

Answer: B

MCQ 24

Period T and frequency f relation:

A) T = 1/f
B) T = f
C) T = 2f
D) T = f²

Answer: A

MCQ 25

In vertical circular motion, tension is maximum at:

A) Top
B) Bottom
C) Side
D) Same everywhere

Answer: B

MCQ 26

Banking of roads reduces dependence on:

A) Friction
B) Gravity
C) Air resistance
D) Normal force

Answer: A

MCQ 27

v = rω relates:

A) Linear and angular velocity
B) Force and acceleration
C) Energy and power
D) Work and time

Answer: A

MCQ 28

Centripetal force is provided by friction when:

A) Car turns on flat road
B) Car accelerates
C) Car brakes
D) Car reverses

Answer: A

Section 3: Gravitation (MCQ 29-35)

MCQ 29

Acceleration due to gravity near Earth's surface:

A) 5 m/s²
B) 9.8 m/s²
C) 12 m/s²
D) 15 m/s²

Answer: B

MCQ 30

Escape velocity from Earth:

A) 7.9 km/s
B) 9 km/s
C) 11.2 km/s
D) 15 km/s

Answer: C

MCQ 31

Newton's Law of Gravitation: F ∝

A) 1/r²
B) r²
C) 1/r
D) r

Answer: A

MCQ 32

Gravitational potential energy is:

A) Always positive
B) Always negative
C) Always zero
D) Can be positive or negative

Answer: B

MCQ 33

Kepler's Third Law: T² ∝

A) r³
B) r²
C) r
D) 1/r

Answer: A

MCQ 34

Value of G (gravitational constant):

A) 6.67 × 10⁻¹¹
B) 9.8
C) 3 × 10⁸
D) 1.6 × 10⁻¹⁹

Answer: A

MCQ 35

Weightlessness in orbit occurs because:

A) No gravity
B) Free fall
C) No air
D) High speed

Answer: B

Section 4: Thermal Physics (MCQ 36-43)

MCQ 36

Heat transfer through solids:

A) Radiation
B) Conduction
C) Convection
D) Reflection

Answer: B

MCQ 37

Absolute zero temperature:

A) -100°C
B) -273°C
C) 0°C
D) 273°C

Answer: B

MCQ 38

Specific heat capacity unit:

A) J/kgK
B) J/K
C) J/kg
D) W/mK

Answer: A

MCQ 39

Ideal gas equation:

A) PV = nRT
B) P = nRT
C) PV = nR
D) PT = nRV

Answer: A

MCQ 40

First law of thermodynamics:

A) ΔU = Q - W
B) ΔU = Q + W
C) ΔU = W - Q
D) ΔU = QW

Answer: A

MCQ 41

Latent heat of fusion is for:

A) Solid to liquid
B) Liquid to gas
C) Solid to gas
D) Gas to liquid

Answer: A

MCQ 42

Temperature measured in Kelvin is called:

A) Absolute temperature
B) Relative temperature
C) Celsius temperature
D) Critical temperature

Answer: A

MCQ 43

Heat engine efficiency formula:

A) 1 - Tᵣ/Tᴹ
B) Tᴹ/Tᵣ
C) 1 - Tᴹ/Tᵣ
D) Tᵣ - Tᴹ

Answer: A

Section 5: Oscillations & Waves (MCQ 44-55)

MCQ 44

SI unit of frequency:

A) Watt
B) Newton
C) Hertz
D) Joule

Answer: C

MCQ 45

Wave speed formula:

A) v = fλ
B) v = f/λ
C) v = λ/f
D) v = f + λ

Answer: A

MCQ 46

Simple harmonic motion acceleration formula:

A) a = -ω²x
B) a = ω²x
C) a = -ωx
D) a = ωx

Answer: A

MCQ 47

In SHM, velocity is maximum at:

A) Amplitude
B) Mean position
C) Extreme position
D) Half amplitude

Answer: B

MCQ 48

Transverse waves require:

A) Rigid medium
B) No medium
C) Elastic medium
D) Liquid medium

Answer: A

MCQ 49

Stationary waves form due to:

A) Interference
B) Diffraction
C) Refraction
D) Reflection

Answer: A

MCQ 50

Doppler effect for sound involves change in:

A) Frequency
B) Speed
C) Wavelength
D) Amplitude

Answer: A

MCQ 51

Time period of a simple pendulum:

A) T = 2π√(l/g)

B) T = 2π√(g/l)

C) T = √(l/g)

D) T = 2πl/g

Answer: A

MCQ 52

Speed of sound in air is approximately:

A) 340 m/s
B) 500 m/s
C) 200 m/s
D) 1000 m/s

Answer: A

MCQ 53

Beats are produced due to:

A) Superposition of waves of nearly equal frequencies
B) Reflection
C) Diffraction
D) Refraction

Answer: A

MCQ 54

Nodes in stationary waves are points of:

A) Zero displacement
B) Maximum displacement
C) Maximum velocity
D) Maximum energy

Answer: A

MCQ 55

Phase difference of π radians corresponds to path difference of:

A) λ/2
B) λ
C) 2λ
D) λ/4

Answer: A

Section 6: Electricity (MCQ 56-70)

MCQ 56

Ohm's Law:

A) V = IR
B) V = I/R
C) V = R/I
D) I = VR

Answer: A

MCQ 57

Unit of resistance:

A) Volt
B) Ampere
C) Ohm
D) Watt

Answer: C

MCQ 58

Resistors in series formula:

A) R = R₁ + R₂
B) 1/R = 1/R₁ + 1/R₂
C) R = R₁R₂
D) R = R₁ - R₂

Answer: A

MCQ 59

Kirchhoff's Current Law states:

A) Sum of currents at junction = 0
B) Sum of voltages in loop = 0
C) I = V/R
D) P = VI

Answer: A

MCQ 60

Power dissipated in resistor:

A) P = I²R
B) P = IR
C) P = V/R
D) P = I/R

Answer: A

MCQ 61

Internal resistance causes:

A) Voltage drop
B) Current increase
C) Power gain
D) Resistance decrease

Answer: A

MCQ 62

EMF is measured in:

A) Volts
B) Amperes
C) Ohms
D) Watts

Answer: A

MCQ 63

Capacitance unit:

A) Farad
B) Ohm
C) Henry
D) Tesla

Answer: A

MCQ 64

Capacitors in parallel: total capacitance:

A) C = C₁ + C₂
B) 1/C = 1/C₁ + 1/C₂
C) C = C₁C₂
D) C = C₁ - C₂

Answer: A

MCQ 65

Energy stored in capacitor:

A) ½CV²
B) CV
C) ½QV
D) QV

Answer: A

MCQ 66

Electric field intensity unit:

A) V/m
B) N/C
C) J/C
D) Both A and B

Answer: D

MCQ 67

Coulomb's law force between two charges:

A) Proportional to 1/r²
B) Proportional to r²
C) Proportional to r
D) Independent of r

Answer: A

MCQ 68

Wheatstone bridge is balanced when:

A) R₁/R₂ = R₃/R₄
B) R₁ + R₂ = R₃ + R₄
C) R₁R₂ = R₃R₄
D) R₁ = R₂ = R₃ = R₄

Answer: A

MCQ 69

Charge of electron:

A) +1.6 × 10⁻¹⁹ C
B) -1.6 × 10⁻¹⁹ C
C) 0
D) 1 C

Answer: B

MCQ 70

Potentiometer measures:

A) Potential difference
B) Current
C) Resistance
D) Power

Answer: A

Section 7: Magnetism & Electromagnetic Induction (MCQ 71-80)

MCQ 71

Unit of magnetic flux density:

A) Tesla
B) Newton
C) Weber
D) Joule

Answer: A

MCQ 72

Force on a current-carrying conductor in magnetic field:

A) F = BIL
B) F = BL/I
C) F = B/IL
D) F = IL/B

Answer: A

MCQ 73

Fleming's Left Hand Rule gives:

A) Direction of force
B) Direction of current
C) Direction of field
D) Magnitude of force

Answer: A

MCQ 74

Faraday's Law states induced EMF is proportional to:

A) Rate of change of flux
B) Flux
C) Current
D) Resistance

Answer: A

MCQ 75

Lenz's Law relates to:

A) Conservation of energy
B) Conservation of charge
C) Conservation of momentum
D) Conservation of mass

Answer: A

MCQ 76

Transformer works on:

A) Mutual induction
B) Self induction
C) Electromagnetic waves
D) Static electricity

Answer: A

MCQ 77

Transformer equation:

A) Vₛ/Nₛ = Vₛ/Nₛ
B) VₛNₛ = VₛNₛ
C) Vₛ/Nₛ = VₛNₛ
D) VₛVₛ = NₛNₛ

Answer: A

MCQ 78

Magnetic flux unit:

A) Weber
B) Tesla
C) Gauss
D) Henry

Answer: A

MCQ 79

Step-up transformer increases:

A) Voltage
B) Current
C) Power
D) Resistance

Answer: A

MCQ 80

AC generator works on:

A) Electromagnetic induction
B) Electrostatic induction
C) Thermal effect
D) Chemical effect

Answer: A

Section 8: Modern Physics (MCQ 81-90)

MCQ 81

Photoelectric effect supports:

A) Wave theory
B) Particle nature of light
C) Sound theory
D) Relativity

Answer: B

MCQ 82

Threshold frequency means:

A) Minimum frequency to emit electrons
B) Maximum frequency
C) Average frequency
D) Zero frequency

Answer: A

MCQ 83

Einstein's photoelectric equation:

A) hf = Φ + KE
B) hf = Φ - KE
C) hf = KE - Φ
D) hf = Φ

Answer: A

MCQ 84

Planck's constant value:

A) 6.63 × 10⁻³⁴ Js
B) 3 × 10⁸ Js
C) 9.11 × 10⁻³¹ Js
D) 1.6 × 10⁻¹⁹ Js

Answer: A

MCQ 85

Radioactive decay law:

A) N = N₀e⁻λᵣ
B) N = N₀eλᵣ
C) N = N₀t⁻½
D) N = N₀/t

Answer: A

MCQ 86

Half-life definition:

A) Time for half the atoms to decay
B) Time for all atoms to decay
C) Half of decay constant
D) Double decay time

Answer: A

MCQ 87

Bohr model assumes electrons in:

A) Fixed orbits
B) Random paths
C) Continuous paths
D) Spiral paths

Answer: A

MCQ 88

Speed of light in vacuum:

A) 3 × 10⁸ m/s
B) 340 m/s
C) 10⁸ m/s
D) 3 × 10⁶ m/s

Answer: A

MCQ 89

Mass-energy equivalence:

A) E = mc²
B) E = mv²
C) E = mgh
D) E = ½mv²

Answer: A

MCQ 90

X-rays are produced by:

A) Accelerating electrons striking a metal target
B) Radioactive decay
C) Nuclear fission
D) Chemical reaction

Answer: A

Section 9: Electronics & Communication (MCQ 91-95)

MCQ 91

A diode allows current to flow:

A) One direction only
B) Both directions
C) No direction
D) Alternating

Answer: A

MCQ 92

Transistor is used as:

A) Amplifier and switch
B) Only amplifier
C) Only switch
D) Rectifier

Answer: A

MCQ 93

Logic gate AND outputs 1 when:

A) All inputs are 1
B) Any input is 1
C) No input is 1
D) Inputs differ

Answer: A

MCQ 94

Modulation is used for:

A) Efficient transmission
B) Amplification
C) Rectification
D) Filtering

Answer: A

MCQ 95

Rectifier converts:

A) AC to DC
B) DC to AC
C) High to low voltage
D) Low to high voltage

Answer: A

Section 10: General & Mixed Concepts (MCQ 96-100)

MCQ 96

Significant figures: 0.00560 has how many?

A) 3
B) 5
C) 4
D) 6

Answer: A

MCQ 97

Vector quantity example:

A) Velocity
B) Speed
C) Mass
D) Temperature

Answer: A

MCQ 98

Scalar quantity example:

A) Energy
B) Force
C) Acceleration
D) Momentum

Answer: A

MCQ 99

Prefix "nano" means:

A) 10⁻⁹
B) 10⁻³
C) 10⁶
D) 10³

Answer: A

MCQ 100

Young's modulus measures:

A) Stiffness
B) Toughness
C) Hardness
D) Ductility

Answer: A

Most Important Repeated Physics Areas

Students should focus heavily on: Newton's Laws, Momentum, Circular Motion, Gravitation, Thermal Physics, Simple Harmonic Motion, Waves, Current Electricity, Magnetism, Electromagnetic Induction, Atomic Physics, and Nuclear Physics. These areas consistently contribute a significant portion of A/L Physics MCQs.

How to Score Higher in Physics MCQs

Practice Past Papers: Complete at least the last 10 years of MCQs.
Create Formula Sheets: Keep a separate notebook for formulas.
Focus on Repeated Concepts: Do not study randomly.
Use Timed Practice: Train under examination conditions.
Review Mistakes: Analyze every incorrect answer.

How ZisuGen Helps Physics Students

ZisuGen provides: AI Physics Tutor, Physics Past Papers, Smart Notes, Formula Libraries, MCQ Practice, and Progress Analytics. Helping students prepare smarter and improve examination performance.

100 Most Repeated A/L Physics MCQ Questions With Answers (2026 Edition)

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100 Most Repeated A/L Physics MCQ Questions With Answers (2026 Edition)

Spread the Knowledge

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How to Read Vernier Caliper?