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gce2025physics
Q1. The dispersion of light would result in which of the following phenomena?
AEclipse
BShadow
CRainbow
DMirage
Correct Answer: C
Dispersion of light occurs when white light separates into its component colors due to different wavelengths refracting at different angles, forming a rainbow.
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Q2. The best color of shirt to be worn on a bright noon day is
ARed
BBlack
CGreen
DWhite
Correct Answer: D
White color reflects most sunlight, keeping the wearer cooler compared to darker colors that absorb more heat.
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Q3. The image formed when an object is placed between the focus and centre of a converging lens is
AReal, inverted and magnified
BReal, inverted and diminished
CErect, virtual and magnified
DErect, virtual and diminished
Correct Answer: A
For a converging lens, an object between F and 2F produces a real, inverted, and magnified image beyond 2F.
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Q4. For a charged body moving in an electric and magnetic crossed field, the ratio of the electric field intensity, E to the magnetic flux density, B is known as
ALorentz ratio
BCharge ratio
CVelocity selector
DElectrochemical equivalence
Correct Answer: C
The ratio E/B gives the velocity at which the electric force balances the magnetic force, selecting particles of that speed in a velocity selector.
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Q5. A note, K from a keyboard has an amplitude of 0.5cm and frequency 2000Hz. Another note, M from a guitar has an amplitude of 1.5cm and frequency 2000Hz. Which of the following statements is true if the two notes are compared?
AK is louder than M
BM is louder than K
CM has a higher pitch than K
DK and M have the same timbre
Correct Answer: B
Loudness depends on amplitude; higher amplitude (1.5cm for M) means M is louder. Same frequency means same pitch, and timbre differs due to different instruments.
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Q6. A simple pendulum of length 0.8m is set oscillating on a planet. If the pendulum completes 20 oscillations in 60s, calculate the acceleration due to gravity on this planet. [π = 3.14]
A2.5ms⁻²
B3.0ms⁻²
C3.5ms⁻²
D3.8ms⁻²
Correct Answer: B
Time period T = 60s / 20 = 3s. T = 2π√(L/g), so g = 4π²L / T² = 4*(3.14)²*0.8 / 9 ≈ 3.0 ms⁻².
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Q7. A liquid of mass 2kg at 61°C is kept in a lagged vessel. If another 2kg of the same liquid at 21°C is added to the liquid in the vessel, calculate the final temperature of the mixture
A50°C
B41°C
C30°C
D15°C
Correct Answer: B
Assuming no heat loss, heat lost = heat gained: 2m c (61 - θ) = 2m c (θ - 21), so θ = (61 + 21)/2 = 41°C.
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Q8. If two bodies, A and B are each in thermal equilibrium with another body C, then the three bodies are in thermal equilibrium with each other. This is the statement of
AZeroth law of thermodynamics
BFirst law of thermodynamics
CSecond law of thermodynamics
DThird law of thermodynamics
Correct Answer: A
The zeroth law defines temperature and thermal equilibrium transitively, allowing thermometers to work.
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Q9. What is the S.I unit of electric charge?
AAmpere
BCoulomb
CVolt
DOhm
Correct Answer: B
The S.I unit of electric charge is the coulomb (C), defined as the charge transported by 1 ampere in 1 second.
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Q10. A body of mass 5kg falls freely from rest. Calculate the kinetic energy after 2 seconds [g = 10ms⁻²]
A50J
B100J
C150J
D200J
Correct Answer: B
Velocity after 2s, v = gt = 10*2 = 20 ms⁻¹. KE = (1/2)mv² = 0.5*5*400 = 100 J.
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Q11. The speed of light in medium A of refractive index 1.5 is 2.0 × 10⁸ms⁻¹. Determine the speed of light in medium B of refractive index 1.2
A1.8 × 10⁸ms⁻¹
B2.5 × 10⁸ms⁻¹
C2.7 × 10⁸ms⁻¹
D3.0 × 10⁸ms⁻¹
Correct Answer: B
Speed in vacuum c = n_A * v_A = 1.5 * 2.0e8 = 3.0e8 ms⁻¹. Then v_B = c / n_B = 3.0e8 / 1.2 = 2.5e8 ms⁻¹.
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Q12. The wavelength of a sound note travelling with a speed of 360ms⁻¹ is 600m. Determine the period of the note
A60,000s
B6,000s
C1.667s
D0.167s
Correct Answer: C
Period T = λ / v = 600 / 360 ≈ 1.667 s.
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Q13. In which of the following levers is the effort applied between the load and the fulcrum?
APliers
BWheelbarrow
CSugar tongs
DTable knife
Correct Answer: C
Sugar tongs are a class 3 lever where the effort is applied between the fulcrum and the load.
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Q14. A current of 2A flows through a resistor of 5Ω. Calculate the power dissipated in the resistor
A10W
B20W
C30W
D40W
Correct Answer: B
Power P = I²R = 2² * 5 = 20 W.
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Q15. Calculate the potential difference across a 10Ω resistor when a current of 0.5A flows through it
A2V
B5V
C10V
D15V
Correct Answer: B
V = IR = 0.5 * 10 = 5 V.
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Q16. Which of the statements is correct about the nucleus of an atom? I. is centrally located in the atom. II. contains the nucleons and electrons. III. is positively charged due to the protons. IV. decays when there is instability inside.
AI, II and IV only
BI, III, and IV only
CI, II and III only
DI and II only
Correct Answer: B
The nucleus is central (I), positively charged due to protons (III), and decays if unstable (IV). It contains nucleons (protons and neutrons), not electrons (II wrong).
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Q17. A radioactive element of mass 16g was isolated and stored. It was discovered that after 40 days only 1g of the element remained undecayed. Calculate the half-life of the element
A2.5days
B5.0days
C10.0days
D15.0days
Correct Answer: C
From 16g to 1g is 4 half-lives (16→8→4→2→1). Time = 40 days, so half-life = 40/4 = 10 days.
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Q18. Which of the following reasons explains why the walls and ceilings of a standard concert hall are usually covered with perforated pads? To
Aincrease the intensity of sound waves
Bincrease the loudness of sound waves
Creduce the effect of reverberation of sound waves
Ddecrease the frequency of sound waves
Correct Answer: C
Perforated pads absorb sound waves, reducing echoes and reverberation for clearer acoustics.
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Q19. A bucket of water of mass 10kg is swung in a vertical circle of radius 1.2m. While at the lowest position of the swing, its speed is 5ms⁻¹. Determine the tension in the string (g = 10ms⁻²)
A41.7N
B141.7N
C208.3N
D308.3N
Correct Answer: D
At lowest point, T - mg = mv²/r, T = mg + mv²/r = 10*10 + 10*25/1.2 = 100 + 208.3 ≈ 308.3 N.
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Q20. A man's near point is 30cm. Which of the following eye defects is the man likely to suffer from?
AHypermetropia
BMyopia
CPresbyopia
DAstigmatism
Correct Answer: A
Hypermetropia (farsightedness) has a near point farther than normal (25 cm), so 30 cm indicates hypermetropia.
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Q21. White light can be produced by a combination of I. magenta, yellow and cyan. II. red, blue and green. III. magenta and green. IV. yellow, red and green.
AII only
BI, II and III only
CI and IV
DII and III only
Correct Answer: A
White light is produced by additive primary colors: red, green, and blue (II). The others do not combine to white.
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Q22. What is the S.I unit of power?
AWatt
BJoule
CNewton
DPascal
Correct Answer: A
The S.I unit of power is the watt (W), which is joule per second.
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Q23. Which of the following statements about stationary wave is not true?
AParticles between adjacent nodes vibrate out of phase with each other
BSuccessive nodes or antinodes occur at intervals of half a wavelength
CParticles between adjacent nodes vibrate in phase with each other
DParticles between adjacent nodes have different amplitudes
Correct Answer: C
In a stationary wave, particles between adjacent nodes are out of phase (180°), not in phase.
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Q24. In a pipe closed at one end and open at the other end, the overtones that accompany the fundamental frequency are
Aodd integer multiples of the fundamental frequency
Beven integer multiples of the fundamental frequency
Call integer multiples of the fundamental frequency
Dprime integer multiples of the fundamental frequency
Correct Answer: A
A closed pipe produces only odd harmonics (overtones) due to the boundary conditions.
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Q25. A radioactive substance of mass 512.0g decays to 64.0g. Determine the number of half-life involved in the decay
A8
B6
C4
D3
Correct Answer: D
512 / 64 = 8, and 2³ = 8, so 3 half-lives.
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Q26. Two waves will interfere destructively if the path difference between the waves is
Aone wavelength
Bone-half wavelength
Ctwo wavelengths
Dzero
Correct Answer: B
Destructive interference occurs when path difference is an odd multiple of λ/2, such as λ/2.
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Q27. A radioactive substance of mass 16g at GMT: 13:00 hour was received at a hospital. The half-life of the substance is 2 hours. Determine the fraction of the substance left after 4 hours
A½
B¼
C1/8
D1/16
Correct Answer: B
After 4 hours = 2 half-lives, fraction left = (1/2)² = 1/4.
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Q28. The mechanical advantage of a hospital bed is 1.71. Which of the following statements is correct? The effort applied
Ais less than the weight of the bed
Bis greater than the weight of the bed
Cequals the weight of the bed
Dcannot be determined
Correct Answer: A
MA = load/effort = 1.71 > 1, so effort < load (weight).
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Q29. A sound from a microphone is transformed to electrical energy. The type of energy stored is
Anuclear chemical energy
Belectrical energy
Csound energy
Dthermal energy
Correct Answer: B
The microphone converts sound energy into electrical energy, which is then stored or transmitted.
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Q30. Calculate the velocity ratio of an inclined plane inclined at 45° to the horizontal
A0.71
B1.0
C1.41
D2.0
Correct Answer: C
VR = 1 / sinθ = 1 / sin45° = 1 / (√2/2) ≈ 1.41.
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Q31. The angle between the velocity vector and the acceleration vector for a body in uniform circular motion is
A45°
B60°
C90°
D120°
Correct Answer: C
In uniform circular motion, acceleration is centripetal, perpendicular to velocity, so 90°.
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Q32. The S.I unit of the power consumed by a system is
ANewton
BCoulomb
CWatt
DTesla
Correct Answer: C
Power is measured in watts (W), the S.I unit for rate of energy transfer.
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Q33. The secondary coil of a transformer has more turns than the primary coil. If the number of turns in the secondary coil is 500 and the primary coil is 250, the step-up transformer is
A2:1
B1:2
C1:4
D4:1
Correct Answer: A
Turns ratio N_s : N_p = 500 : 250 = 2:1, step-up since N_s > N_p.
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Q34. Which of the following statements is correct about the nucleus of an atom? It
Acontains electrons
Bis negatively charged
Cis positively charged
Ddecays when there is stability
Correct Answer: C
The nucleus contains protons (positive charge) and neutrons, making it positively charged.
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Q35. A radium nuclide decays by emitting alpha particle as shown below: ²²⁶₈₈Ra → X + ⁴₂He. Determine the daughter nuclide
Q36. A bullet of mass 0.025kg moves at 250ms⁻¹. Calculate its deBroglie wavelength [h = 6.63 × 10⁻³⁴ Js]
A6.67 × 10⁻³⁸m
B5.34 × 10⁻³⁵m
C1.07 × 10⁻³⁴m
D2.13 × 10⁻³⁴m
Correct Answer: C
λ = h / (mv) = 6.63e-34 / (0.025 * 250) = 6.63e-34 / 6.25 ≈ 1.06 × 10⁻³⁴ m.
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Q37. An electron moving with a speed of 5.0 × 10⁵ms⁻¹ enters a uniform magnetic field at 90°. Calculate the magnitude of the magnetic force on the electron if the magnetic field intensity is 0.25T [e = 1.6 × 10⁻¹⁹C]
A1.5 × 10⁻¹⁴N
B2.0 × 10⁻¹⁴N
C2.5 × 10⁻¹⁴N
D3.5 × 10⁻¹⁴N
Correct Answer: B
F = q v B sin90° = 1.6e-19 * 5.0e5 * 0.25 = 2.0 × 10⁻¹⁴ N.
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Q38. A beam of light which appears to come from a point in space is said to be
Aconvergent
Bdivergent
Cparallel
Dcircular
Correct Answer: B
A divergent beam appears to originate from a virtual point source behind the observer.
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Q39. A sound wave made up of large number of unrelated frequencies superimposed on each other is called
Aharmonies
Bnote
Cnoise
Dpitch
Correct Answer: C
Noise consists of a random superposition of many unrelated frequencies, unlike musical notes with harmonics.
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Q40. A boy pushes a box of mass 80kg along a horizontal floor with a force of 200N. If the box is pushed with a uniform velocity, what is the coefficient of friction between the box and the floor? [g = 10ms⁻²]
A0.25
B0.40
C0.50
D0.65
Correct Answer: A
For uniform velocity, F = frictional force = μ mg, so μ = F / (mg) = 200 / (80 * 10) = 0.25.