2014 WAEC (WASSCE) Physics Past Questions & Answers

Question 1

A ball falling through a viscous liquid is acted upon by

Accepted Answer

D. upthrust, the ball's weight and viscous force

Answer

A. upthrust only

Answer

B. upthrust and the ball's weight

Answer

C. the ball's weight and viscous force

Question 2

The energy stored in a simple cell is

Accepted Answer

D. chemical

Answer

A. electrical

Answer

B. nuclear

Answer

C. thermal

Question 3

Refraction of lights differs from reflection in that, in refraction i. at least two media are involved ii. there is a change in the direction of the ray iii. the speed of the ray changes. Which of the statements above is/are correct?

Accepted Answer

D. i and iii only

Answer

A. i only

Answer

B. i ad ii only

Answer

C. ii and iii only

Question 4

In an ac circuit when the supply voltage frequency is equal to the resonant frequency, the current

Accepted Answer

D. is in phase with the supply voltage

Answer

A. leads the supply voltge by 90o

Answer

B. lags behind the supply voltage by 90o

Answer

C. leads the supply voltage by 45o

Question 5

The period of a simple pendulum X is 5s. What is the period of a simple pendulum Y which makes 50 vibrations in the same time it takes X to make 20 vibrations?

Accepted Answer

C. 2.0s

Answer

A. 12.5s

Answer

B. 2.5s

Answer

D. 1.2s

Question 6

Which of the following conditions occur at resonance in a series RLC circuit? i. Impedance equals resistance ii. Current is maximum iii. Reactance is maximum iv. Current and voltage are 90° out of phase

Accepted Answer

A. i and ii only

Answer

B. i and iii only

Answer

C. i, ii and iii only

Answer

D. i, ii, iii and iv

Question 7

The temperature at which the water vapor in the air saturates the air and begins to condense is known as

Accepted Answer

A. dew point

Answer

B. critical point

Answer

C. boiling point

Answer

D. triple point

Question 8

an observer hears an echo 1.26 seconds after blowing a whistle near a cliff. calculate the distance of the observer from the cliff. [speed of sound in air = 330$ms^{-1}$]

Accepted Answer

B. 207.9m

Answer

A. 104.4m

Answer

C. 415.8m

Answer

D. 523.8m

Question 9

When the linear momentum of a body is constant, the net force acting on it

Accepted Answer

A. is zero

Answer

B. increases

Answer

C. decreases

Answer

D. remains constant

Question 10

A car starts from rest and covers a distance of 40m in 10s. Calculate the magnitude of its acceleration

Accepted Answer

B. 0.80$ms^{-2}$

Answer

A. 0.25$ms^{-2}$

Answer

C. 3.20$ms^{-2}$

Answer

D. 4.00$ms^{-2}$

Question 11

The knowledge of surface tension is applied in the following areas except in

Accepted Answer

B. production of palm oil

Answer

A. manufacturing of rain coats

Answer

C. floating of a needle on water

Answer

D. washing of plates with soapy water

Question 12

Heat transfer by conduction is similar to wave motion because

Accepted Answer

D. no transfer of materials is involved

Answer

A. there is increase in temperature

Answer

B. transfer of materials is involved

Answer

C. charged particles vibrates at right angles

Question 13

A fish inside a pond appears to be at a depth of 1.5m when viewed vertically from above. The refractive index of the water in the pound is 1.3. Calculate the apparent displacement of the fish

Accepted Answer

D. 0.45m

Answer

A. 2.50m

Answer

B. 1.95m

Answer

C. 1.50m

Question 14

An electric motor converts

Accepted Answer

A. electrical energy to mechanical energy

Answer

B. mechanical energy to electrical energy

Answer

C. mechanical energy to chemical energy

Answer

D. electrical energy to thermal energy

Question 15

A 15 $\mu F$ capacitor is connected to a 240V, 50Hz ac. source. Calculate the reactance of the capacitance [$\pi = 3.142$]

Accepted Answer

D. 212$\Omega$

Answer

A. 16$\Omega$

Answer

B. 68$\Omega$

Answer

C. 106$\Omega$

Question 16

An object is placed in front of two plane mirrors inclined at 60o to each other. Determine the number of the images formed

Accepted Answer

C. 5

Answer

A. 2

Answer

B. 3

Answer

D. 7

Question 17

The S.I unit of power is

Accepted Answer

C. W

Answer

A. N

Answer

B. Pa

Answer

D. J

Question 18

The energy required to separate the nucleus in an atom completely is known as

Accepted Answer

D. nuclear binding energy

Answer

A. mass defect of the atom

Answer

B. electron binding energy

Answer

C. excitation energy

Question 19

A quantity of water at 20oC is mixed with another quantity of water at 70oC. The final steady temperature of the mixture is 40oC. Determine the ratio of the mass of the cold water to that of the hot water

Accepted Answer

B. 3:2

Answer

A. 7:2

Answer

C. 2:5

Answer

D. 1:2

Question 20

A transverse wave can be distinguished from a longitudinal wave by

Accepted Answer

D. polarization

Answer

A. diffraction

Answer

B. relection

Answer

C. refraction

Question 21

When an elastic material is stretched by a force, the energy stored in it is

Accepted Answer

B. potential

Answer

A. kinetic

Answer

C. thermal

Answer

D. electrical

Question 22

An aluminum foil is placed across a beam of radiation from a radioactive source. Which of the following types of radiation will be stopped by it?

Accepted Answer

A. alpha and beta particles

Answer

B. alpha and gamma particles

Answer

C. beta and gamma particles

Answer

D. gamma particles only

Question 23

A wire of length 100 cm has a resistance of 10$\Omega$. If its cross-sectional area is 0.005cm2, determine its resistivity

Accepted Answer

A. 0.0005$\Omega$cm

Answer

B. 0.0015$\Omega$cm

Answer

C. 0.0016$\Omega$cm

Answer

D. 0.0700$\Omega$cm

Question 24

If no net force acts on an object, the object maintains a state of rest or constant speed in a straight line. The above is a statement of Newton's

Accepted Answer

A. first law of motion

Answer

B. second law of motion

Answer

C. third law of motion

Answer

D. law of universal gravitation

Question 25

The change of state from solid to liquid occurs

Accepted Answer

A. at constant temperature

Answer

B. when temperature is lower than the boiling point

Answer

C. when temperature is just near freezing point

Answer

D. when temperature is equal to the boiling point

Question 26

Alcohol of mass 21g and density 0.7g cm-3 is mixed with 10g of water. Determine the density of the mixture [density of water = 1.0gcm-3]

Accepted Answer

A. 0.775gcm-3

Answer

B. 0.875gcm-3

Answer

C. 0.780gcm-3

Answer

D. 0.880gcm-3

Question 27

The region around a magnet in which magnetic force can be expressed is known as

Accepted Answer

C. field

Answer

A. declination

Answer

B. flux density

Answer

D. flux

Question 28

An element of nucleon number P and atomic number Q emits an alpha particle from its nucleus. The resultant numbers of the new element formed are respectively

Accepted Answer

B. P - 4 and Q - 2

Answer

A. P - 4 and Q + 2

Answer

C. P + 2 and Q + 2

Answer

D. P + 2 and Q - 2

Question 29

An ammeter can be adapted to measure potential difference by using a

Accepted Answer

B. multiplier

Answer

A. shunt

Answer

C. rheostat

Answer

D. resistance box

Question 30

A transformer has 400 turns of wire in the primary coil and 40 turns in the secondary col. If the input voltage is 150 volts. Calculate the magnitude of the output voltage

Accepted Answer

D. 15V

Answer

A. 150V

Answer

B. 55V

Answer

C. 36V

Question 31

A car traveling at 30ms$^{-1}$ overcomes a frictional resistance of 100N while moving. Calculate the power developed by the engine. [1 hp = 0.75 kW]

Accepted Answer

C. 4.00hp

Answer

A. 0.23hp

Answer

B. 0.40hp

Answer

D. 4.40hp

Question 32

A body of mass M kg rests on a plane inclined at an angle $	heta$ to the horizontal. The component of the weight of the body parallel to the plane is

Accepted Answer

A. Mg sin $	heta$

Answer

B. Mg cos $	heta$

Answer

C. Mg tan $	heta$

Answer

D. Mg sec $	heta$

Question 33

Two identical charges situated 20cm apart in vacuum repel each other with a force of 1.0N.Calculate the value of each other with a force of 1.0N. Calculate the value of each charge. [(14 $\pi \varepsilon_o)^{-1}$ = 9 x 109Nm2C-2]

Accepted Answer

A. 21$\mu C$

Answer

B. 3.6$\mu C$

Answer

C. 4.0$\mu C$

Answer

D. 4.4$\mu C$

Question 34

A screw-jack has the distance between its successive threads as P and the length of its tommy bar as r. Its velocity ratio is given by the expression

Accepted Answer

B. $\frac{2 \pi r}{P}$

Answer

A. $\frac{2 \pi r^2}{P}$

Answer

C. $\frac{2 \pi}{rp}$

Answer

D. $\frac{P}{2 \pi r}$

Question 35

Which of the following types of thermometers can be used to measure a range of temperature from -50°C to 50°? i. Clinical ii. Mercury iii. Alcohol-in-glass

Accepted Answer

C. iii only

Answer

A. i only

Answer

B. ii only

Answer

D. i and ii only

Question 36

The functional difference between a lens and a mirror is that a lens

Accepted Answer

B. refracts a beam of light while a mirror reflects it

Answer

A. reflects a beam of light while a mirror refracts it

Answer

C. absorbs incident rays while a mirror transmit them

Answer

D. transmits incidents ray whle a mirror absorbs them

Question 37

Which of the following pairs of physical quantities is made up of vectors?

Accepted Answer

C. dislacement and acceleration

Answer

A. speed and displacement

Answer

B. mass and force

Answer

D. momentum and length

Question 38

A device that converts mechanical energy into electrical energy is

Accepted Answer

A. a dynamo

Answer

B. an electric motor

Answer

C. an induction coil

Answer

D. a transformer

Question 39

Which of the following statements is the major advantage of nuclear fusion over nuclear fission?

Accepted Answer

C. fussion does not release as much dangerous radiation as fission

Answer

A. nuclear fusion releases more energy

Answer

B. more neutrons are released in fusion than in fission

Answer

D. fusion reactions occur more readily than fission

Question 40

A body is projected vertically upwards with a speed of 10 $ms^{-1}$ from a point 2m above the ground. Calculate the total time taken for the body to reach the ground. [g = 10$ms^{-2}$]

Accepted Answer

C. 2.18s

Answer

A. 1.00s

Answer

B. 2.00s

Answer

D. 3.00s

Question 41

An object of mass m moves with a uniform speed v round a circular path of radius r. If its angular speed is $\omega$, the magnitude of the centripetal force acting on it is

Accepted Answer

A. $m \omega^2 r$

Answer

B. $\frac{mv^2}{r}$

Answer

C. $m \omega r$

Answer

D. $\frac{mv^2}{r^2}$

Question 42

The quality of a note depends on its

Accepted Answer

C. overtones

Answer

A. frequency

Answer

B. pitch

Answer

D. amplitude

Question 43

The mass of an empty density bottle is 30g. When filled with a liquid, the mass of the bottle and the liquid is 40g. On heating the filled bottle through 40ºc, the mass reduces to 38g. Calculate the apparent cubic expansivity of the liquid

Accepted Answer

B. 6.25 x 10-3K-1

Answer

A. 6.25 x 10K-1

Answer

C. 2.50 x 10-3K-1

Answer

D. 2.50 x 10-4K-1

Question 44

Which of the following relations about the focal length fo of the objective and focal length fe of the eye piece of a compound is correct?

Accepted Answer

B. fo < fe

Answer

A. fo = fe

Answer

C. fo > fe

Answer

D. fe = 2fo

2014 WAEC (WASSCE) Physics Past Questions

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