JAMB UTME 2018
JAMB Physics 2018 past questions
7 objective questions from the 2018 JAMB Physics paper. Answer each one, then reveal the answer and explanation.
Question 1
Work and energyA body of mass 2 kg is lifted through 5 m. Calculate the potential energy gained. (g = 10 m/s²)
- Option A: 10 J
- Option B: 50 J
- Option C: 100 J
- Option D: 20 J
Show the answerHide the answer to question 1
Answer: C, 100 J
PE = mgh = 2 × 10 × 5 = 100 J.
Question 2
Work and energyCalculate the kinetic energy of a 4 kg body moving at 8 m/s.
- Option A: 256 J
- Option B: 128 J
- Option C: 16 J
- Option D: 32 J
Show the answerHide the answer to question 2
Answer: B, 128 J
KE = ½mv² = ½ × 4 × 8² = 128 J.
Question 3
HeatHow much heat is needed to raise the temperature of 1 kg of copper by 15 °C? (Specific heat capacity of copper = 400 J/kg K.)
- Option A: 6,000 J
- Option B: 3,000 J
- Option C: 400 J
- Option D: 12,000 J
Show the answerHide the answer to question 3
Answer: A, 6,000 J
Q = mcΔθ = 1 × 400 × 15 = 6,000 J.
Question 4
PressureA force of 700 N acts on an area of 10 m². Find the pressure exerted.
- Option A: 7,000 Pa
- Option B: 70 Pa
- Option C: 35 Pa
- Option D: 140 Pa
Show the answerHide the answer to question 4
Answer: B, 70 Pa
Pressure = force ÷ area = 700 ÷ 10 = 70 Pa.
Question 5
Units and measurementWhat is the SI unit of capacitance?
- Option A: Henry
- Option B: Coulomb
- Option C: Farad
- Option D: Ohm
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Answer: C, Farad
Capacitance is measured in farads (F).
Question 6
Current electricityA potential difference of 37.5 V is applied across a 15 Ω resistor. Find the current that flows.
- Option A: 2.5 A
- Option B: 562.5 A
- Option C: 0.4 A
- Option D: 5 A
Show the answerHide the answer to question 6
Answer: A, 2.5 A
By Ohm's law, I = V ÷ R = 37.5 ÷ 15 = 2.5 A.
Question 7
MotionA car moving at 6 m/s accelerates uniformly at 2 m/s² for 6 s. Find its final velocity.
- Option A: 14 m/s
- Option B: 18 m/s
- Option C: 8 m/s
- Option D: 36 m/s
Show the answerHide the answer to question 7
Answer: B, 18 m/s
Use v = u + at = 6 + 2 × 6 = 18 m/s.
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