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Physics Past Questions | JAMB, WAEC, NECO and Post UTME Past Questions

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Question 21

A train with an initial velocity of 20ms-1 is subjected to a uniform deceleration of 2ms-2. The time required to bring the train to a complete halt is

Options

A) 10s

B) 40s

C) 5s

D) 20s

Suggested Lesson: More Examples on Subway Train Motion | One-Dimensional Kinematics

Comments (3)

Question 22

Calculate the apparent weight loss of a man weighing 70kg in an elevator moving downwards with an acceleration of 1.5ms-2.

Options

A) 105N

B) 686N

C) 595N

D) 581N

Suggested Lesson: Weight and the Gravitational Force | Force and Newton's Laws of Motion

Comments (1)

Question 23

A piece of cork floats in a liquid. What fraction its volume will be immersed in the liquid? [density of the cork = 0.25 × 103kgm-3, Density of the liquid = 1.25 × 103kgm-3]

Options

A) 0.2

B) 0.1

C) 0.8

D) 0.5

Suggested Lesson: Density and Archimedes’ Principle | Fluid Statics

Comments (1)

Question 24

physics-4

In the circuit above R is a resistor whose resistance increases with increases with increase in temperature L1 and L2 are identical lamps. If the temperature of R increases

Options

A) L1 becomes brighter and L2 becomes dimmer

B) L1 becomes brighter and L2 does not change

C) L2 becomes dimmer and L1 does not change

D) L1 becomes dimmer and L2 does not change

E) L1 and L2 becomes brighter

Suggested Lesson: Temperature Variation of Resistance | Electric Current, Resistance, and Ohm's Law

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Question 25

A house is supplied with a 240V a.c mains. To operate a door bell rated at 8V, a transformer is used if the number of turns in the primary coil of the transformer is 900. Calculate the number of turns in the secondary coil of the transformer

Options

A) 30

B) 240

C) 248

D) 450

E) 1248

Suggested Lesson: Transformers | Electromagnetic Induction and AC Circuits

Comments (1)

Question 26

An object is moving with a velocity of 5ms-1. At what height must a similar body be situated to have a potential energy equal in value with the kinetic energy of the moving body? [g ≈ 10ms-2]

Options

A) 1.3m

B) 25.0m

C) 1.0m

D) 20.0m

Suggested Lesson: Converting Between Potential Energy and Kinetic Energy | Work, Energy and Energy Resources

Comments (1)

Question 27

If a pump is capable of lifting 5000 kg of water through a vertical height of 60 m in 15 min, the power of the pump is

Options

A) 3.3 × 103 Js-1

B) 2.5 × 104 Js-1

C) 2.5 × 105 Js-1

D) 2.3 × 103 Js-1

Suggested Lesson: Power in Fluid Flow | Fluid Dynamics and Applications

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Question 28

The coefficient of friction between two perfectly smooth surface is

Options

A) Infinity

B) One

C) Half

D) Zero

Suggested Lesson: Friction | Friction, Drag and Elasticity

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Question 29

A piece of radioactive material contains 1000 atoms. If its half-life is 20 seconds, the time taken for 125 atoms to remain is

Options

A) 40 seconds

B) 20 seconds

C) 60 seconds

D) 80 seconds

Suggested Lesson: Summarizing Half-Life and Activity | Radioactivity and Nuclear Physics

Comments (1)

Question 30

Calculate the work done, when a force of 20N stretches a spring by 50mm.

Options

A) 0.5 J

B) 2.5 J

C) 1.5 J

D) 2.0 J

Suggested Lesson: Potential Energy of a Spring | Work, Energy and Energy Resources

Comments (1)
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