Question Library — KalmiPrep by Kalmitech

Physics WAEC / WASSCE 1996 Mechanics and Properties of Matter

A body of mass 2kg is suspended from the ceiling of a lift with a light inextensible string. lf the lift moves upwards with acceleration of 2ms-2, calculate the magnitude of the tension in the string (g = 1Oms-2)

A

24N

B

20N

C

16N

D

4N

E

0N

medium Difficulty

Physics WAEC / WASSCE 1996 Mechanics and Properties of Matter

A stationary object of mass 4kg is set in motion by a net force of 5ON. If the object attains is speed of 5ms-1 in time. Calculate the value of t.

A

0.20s

B

0.40s

C

0.63s

D

0.80s

E

1.30s

medium Difficulty

Physics WAEC / WASSCE 1996 Mechanics and Properties of Matter

The diagram above illustrates the velocity-time graph of the motion of a body. Calculate the total distance covered by the body

Attached Figure / Diagram

A

50m

B

65m

C

175m

D

225m

E

300m

medium Difficulty

Physics WAEC / WASSCE 1996 Mechanics and Properties of Matter

A rocket is launched from the surface of the earth. If the radius of the earth is 6.4 x 106m and the acceleration of free fall due to gravity is 1Oms-1 calculate the escape velocity of the rocket.

A

2.53 x 104ms-1

B

1.13 x 104ms

C

8.00 x 103ms-1

D

4.23 x 103ms-1

E

6.41 x 104ms-1

medium Difficulty

Physics WAEC / WASSCE 1996 Mechanics and Properties of Matter

The velocity ratio and efficiency of a system of pulleys are 6 and 80% respectively. How much effort is required to lift a load of mass 120kg with this system? (g=10ms-2)

A

25N

B

90N

C

96N

D

250N

E

960N

medium Difficulty

Physics WAEC / WASSCE 1996 Mechanics and Properties of Matter

Two spanners X and Y of lengths 15cm and 20cm respectively are used in turn to give a screw of pitch 2mm one complete rotation. If Rx and Ry are the respective velocity ratios of the spanners then the ratio Rx : Ry is

A

1 : 50

B

3 : 20

C

3:4

D

4:3

E

20:3

medium Difficulty

Physics WAEC / WASSCE 1996 Mechanics and Properties of Matter

The pressure of a fixed mass of gas is 2.0 x 105Nm-2 at a known temperature. Assuming that the temperature remains constant, what will be the pressure of the gas if its volume is halved?

A

1.0x105Nm-2

B

2.0X105Nm-2

C

3.0x105Nm-2

D

4.0 x105Nm-2

E

5.0 x105Nm-2

medium Difficulty

Physics WAEC / WASSCE 1996 Mechanics and Properties of Matter

Which of the following statements is not correct?

A

Heat energy can be transformed into mechanical energy

B

That total heat content of a body is the sum of the kinetic energies of its molecules

C

lf a body is heated, its molecules move faster.

D

lf a body is cooled, molecular movement remains constant.

medium Difficulty

Physics WAEC / WASSCE 1996 Mechanics and Properties of Matter

The saturated vapour pressure of a liquid increases as the

A

volume of the liquid increases

B

volume of the liquid decreases

C

temperature of the liquid increases

D

temperature of the liquid decreases

E

mass of the liquid decreases

medium Difficulty

Physics WAEC / WASSCE 1996 Mechanics and Properties of Matter

The main reason why rice cooks faster in a pressure cooker than in cooking pot is that

A

less heat escapes from the cooker

B

the vapour pressure in the cooker is constant

C

the rice is not affected by the draught over the cooker

D

the vapour pressure in the cooker decreases

E

the boiling point of water in the cooker is raised.

medium Difficulty

Physics WAEC / WASSCE 1996 Mechanics and Properties of Matter

A boy walks away from a plane mirror at a speed of 3 ms-1 in a direction normal to the surface of the mirror. At what speed is his image approaching him?

A

8 9.0ms-1

B

6.0ms-1

C

4.5ms-1

D

1.5ms-1

E

0.0ms-1

medium Difficulty

Physics WAEC / WASSCE 1996 Mechanics and Properties of Matter

The main function of the mouth of a telephone is to convert sound energy into

A

heat energy

B

light energy

C

chemical energy

D

electrical energy

E

mechanical energy

medium Difficulty

Physics WAEC / WASSCE 1996 Mechanics and Properties of Matter

A sound wave of velocity 350 ms-1 is directed towards the surface of water. lf the ratio of the wavelength of sound in water to that in air is 425:100, calculate the velocity on the wave in water

A

82.4ms-1

B

148.8ms-1

C

350.0ms-1

D

1487.5ms-1

E

3500.5ms-1.

medium Difficulty

Physics WAEC / WASSCE 1996 Mechanics and Properties of Matter

The diagram above illustrates a variation of the displacement y of a wave particle with time t. lf the velocity of wave is 250ms-1, calculate the distance between two successive particles which are in phase

Attached Figure / Diagram

A

20m

B

2.5m

C

3.0m

D

5.0m

E

50.0m

medium Difficulty

Physics WAEC / WASSCE 1996 Mechanics and Properties of Matter

CalcuIate the power delivered by a 3-phase line if its voltage and current at 132KV and 60A respectively.

A

2.38 x 107W

B

7.92 x 106W

C

3.96 x 106W

D

2.64 x 106W

E

7.92 x 104W

medium Difficulty