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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


A) 10s

B) 40s

C) 5s

D) 20s

Comments (4)

Question 22

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


Comments (9)

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]


A) 0.2

B) 0.1

C) 0.8

D) 0.5

Comments (6)

Question 24


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


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

Comments (1)

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


A) 30

B) 240

C) 248

D) 450

E) 1248

Comments (2)

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]


A) 1.3m

B) 25.0m

C) 1.0m

D) 20.0m

Comments (3)

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


A) 3.3 × 103 Js-1

B) 2.5 × 104 Js-1

C) 2.5 × 105 Js-1

D) 2.3 × 103 Js-1

Comments (5)

Question 28

The coefficient of friction between two perfectly smooth surface is


A) Infinity

B) One

C) Half

D) Zero

Comments (1)

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


A) 40 seconds

B) 20 seconds

C) 60 seconds

D) 80 seconds

Comments (2)

Question 30

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


A) 0.5 J

B) 2.5 J

C) 1.5 J

D) 2.0 J

Comments (3)