Question Library — KalmiPrep by Kalmitech

Physics WAEC / WASSCE 2008 Current Electricity & Electric Circuits

Which of the following sets of quantities is fundamental?

A

length, mass and time

B

speed, length and time

C

speed, mass and distance

D

distance, speed and time

medium Difficulty

Physics WAEC / WASSCE 2008 Equilibrium of Forces, Moments & Flotation

which of the following statements about Archimedes' principle is correct? The upthrust on a body is a measure of the

A

mass of fluid displaced

B

weight of the body

C

volume of the body

D

weight of the fluid displaced

medium Difficulty

Physics WAEC / WASSCE 2008 Current Electricity & Electric Circuits

Which of the following is/are in random motion? i. Pollen grains in water ii. The molecules of hydrogen gas ii. Fine chalk particles floating in air

A

i and ii only

B

i and iii only

C

ii and iii only

D

i, ii and iii

medium Difficulty

Physics WAEC / WASSCE 2008 Newton's Laws, Momentum & Collisions

A car travelling with a uniform velocity of 30ms-1 along a horizontal road overcomes a constant frictional force of 600N. Calculate the power of the engine of the car

A

18kW

B

20kW

C

180kW

D

200kW

medium Difficulty

Physics WAEC / WASSCE 2008 Magnetism, Electromagnetism & AC Circuits

Which of the following devices convert heat energy to electrical energy?

A

transformer

B

dynamo

C

thermocouple

D

thermostat

medium Difficulty

Physics WAEC / WASSCE 2008 Current Electricity & Electric Circuits

An object of mass 0.25kg moves at a height h above the ground with a speed of 4ms-1, if its mechanical energy at this height is 12 J, determine the value of h. [g = 10ms-1]

A

0.8m

B

4.0m

C

4.8m

D

5.6m

medium Difficulty

Physics WAEC / WASSCE 2008 Work, Energy, Power & Simple Machines

Which of the following equations for the efficiency of a machine is correct?

A

Efficiency = \(\frac{\text{Velocity Ratio}}{\text{Mechanical Advantage}}\) x 100%

B

Efficiency = \(\frac{input}{output}\) x 100%

C

Efficiency = \(\frac{\text{load distance}}{\text{effort distance}}\) x 100%

D

Efficiency = \(\frac{\text{Mechanical Advantage}}{\text{Velocity Ratio}}\) x 100%

medium Difficulty

Physics WAEC / WASSCE 2008 Current Electricity & Electric Circuits

The design of the thermostat of an electric iron is based on the

A

emmision of electrons from metals when heated

B

increase in size of metals when heated

C

increase in the density of metals when heated

D

change in the mass of metals when heated

medium Difficulty

Physics WAEC / WASSCE 2008 Atomic, Quantum, Nuclear Physics & Electronics

A metal rod of length 50cm is heated from 40oC to 80oC. If the linear expansivity of the material is \(\alpha\), calculate the increase in length of the rod (in metres) in terms of \(\alpha\)

A

20\(\alpha\)

B

200\(\alpha\)

C

2000\(\alpha\)

D

20000\(\alpha\)

medium Difficulty

Physics WAEC / WASSCE 2008 Linear Motion, Projectiles & Kinematics

The diagram above represents the displacement-time graph of the motion of an object thrown upwards. The velocity of the object at the point P is

Attached Figure / Diagram

A

maximum

B

uniform

C

zero

D

terminal

medium Difficulty

Physics WAEC / WASSCE 2008 Current Electricity & Electric Circuits

The diagram above illustrates a bar magnet near a coil connected to a galvanometer, When the magnet is rapidly moves towards the coil i. e.m.f. is induced in the coil ii. the galvanometer needle deflects iii. the magnet is attracted by the coil. Which of the statements above is/are correct?

Attached Figure / Diagram

A

i only

B

ii only

C

iii only

D

i and iii only

medium Difficulty

Physics WAEC / WASSCE 2008 Current Electricity & Electric Circuits

The mass attached to a string is moving in a circular path. If the speed is doubled, the tension in the string will be

A

doubled

B

halved

C

four times as great

D

one-fourth as much

medium Difficulty

Physics WAEC / WASSCE 2008 Current Electricity & Electric Circuits

An object of mass 2kg moving with a velocity 3ms-11 collides head-on with another object of mass 1kg moving in the opposite direction with a velocity of 4ms-1. If the objects stick together after collision, calculate their common speed.

A

0.60ms-1

B

0.67ms-1

C

2.00ms-1

D

3.33-1

medium Difficulty

Physics WAEC / WASSCE 2008 Current Electricity & Electric Circuits

A rectangular block of dimensions 2.0m x 1.0m x 0.5m weighs 200N. calculate the maximum pressure exerted by the block on a horizontal floor.

A

100Nm-2

B

200Nm-2

C

300Nm-2

D

400Nm-2

medium Difficulty

Physics WAEC / WASSCE 2008 Units, Measurements & Dimensional Analysis

A very sensitive spring balance was used to determine the weight of an object at the north pole. When the same spring balance was used to measure the weight of the same object at the equator, it was found to reduce. The explanation for this observation is that

A

it is very hot at the equator

B

the spring balance has expanded

C

the acceleration of free fall due to gravity varies with location

D

the mass of the body is reduced

medium Difficulty