2019 WAEC (WASSCE) Physics Past Questions & Answers

Question 1

The nucleon and proton numbers of a neutral atom of an element are 238 and 92 respectively. Determine the number of neutrons in the atom.

Accepted Answer

D. 146

Answer

A. 119

Answer

B. 330

Answer

C. 165

Question 2

The anomalous expansion of water occurs in the range

Accepted Answer

B. 0 °C to 4 °C

Answer

A. 0 °C to 100 °C

Answer

C. 4 °C to 100 C

Answer

D. -4 °C to 0 °C

Question 3

The vacuum in a thermoflask reduces heat loss resulting from

Accepted Answer

B. conduction and convection only

Answer

A. radiation only

Answer

C. radiation and convection only

Answer

D. conduction only

Question 4

Which of the following properties is not exhibited by sound waves?

Accepted Answer

B. Polarization

Answer

A. Diffraction

Answer

C. Interference

Answer

D. Reflection

Question 5

A rectangular piece of iron measuring 4 cm by 3 cm at 20$^o$C is heated until its temperature increases by 100 C. Calculate the new area of the metal. [Linear expansivity of iron is 1.2x 10$^{-5}$ K$^{-1}$]

Accepted Answer

C. 12.0288 cm$^3$

Answer

A. 12.0144 cm$^3$

Answer

B. 12.0346 cm$^3$

Answer

D. 12.0173 cm$^3$

Question 6

The wire of a platinum resistance thermometer has d resistance of 3.5$\Omega$ at 0 °C and 10.52$\Omega$ at 100°C. Calculate the temperature of the wire when its resistance is 7.5$\Omega$.

Accepted Answer

D. 57 $^o$C

Answer

A. 78 °C

Answer

B. 25 $^o$C

Answer

C. 30$^o$C

Question 7

Which of the following statements about a neutral atom is correct? The

Accepted Answer

D. number of protons is equal to that of electrons.

Answer

A. core is composed of electrons and protons

Answer

B. number of electrons is equal to that of neutron

Answer

C. number of neutrons is equal to that of protons

Question 8

If the efficiency of a transformer is 100%, which of the following equations would be correct?

Accepted Answer

C. N$_s$I$_s$ = N$_p$I$_p$

Answer

A. N$_p$E$_p$ = N$_s$E$_s$

Answer

B. N$_s$I$_p$= N$_p$I$_s$

Answer

D. I$_p$E$_s$ = I$_s$E$_p$

Question 9

The diagram above illustrates an object moving in a circular path at a constant speed. Which of the arrows indicates the direction of linear velocity?

Accepted Answer

C. Y

Answer

A. z

Answer

B. X

Answer

D. W

Question 10

Which of the following devices is used for storing electric charges?

Accepted Answer

D. Capacitor

Answer

A. Transformer

Answer

B. Ammeter

Answer

C. Potentiometer

Question 11

The graph above illustrates the variation of temperature $	heta$ with time (t) for a solid that is being heated. Which processes take place at segments P and Q respectively?

Accepted Answer

B. Evaporation and solidification

Answer

A. Freezing and vaporization

Answer

C. Melting and boiling

Answer

D. Condensation and evaporation

Question 12

The time rate of increase in velocity is called

Accepted Answer

C. acceleration

Answer

A. force

Answer

B. momentum

Answer

D. speed

Question 13

When ultraviolet light is incident on certain metallic p articles are emitted. These particles are called

Accepted Answer

C. photoelectrons

Answer

A. positrons

Answer

B. protons

Answer

D. photons

Question 14

Which of the following statements is the correct reason for using soft iron in making the armature or an electric bell?

Accepted Answer

B. It loses its magnetism readily

Answer

A. It is a diamagnetic material

Answer

C. It is not easily magnetized

Answer

D. It retains its magnetism for a long time

Question 15

A ray of light traveling from a rectangular glass block of refractive index 1.5 into air strikes the block at an angle of incidence of 30. Calculate its angle of refraction.

Accepted Answer

A. 48.6°

Answer

B. 19.5°

Answer

C. 20.0

Answer

D. 45.0

Question 16

Which of the following graphs gives the correct relationship between energy and mass when mass is converted to energy.

Accepted Answer

D. D

Answer

A. A

Answer

B. B

Answer

C. C

Question 17

Calculate the quantity of heat needed to change the temperature of 60g of ice at 0 °C to 80 °C. [specific latent heat of fusion of ice= 3.36 x 10$^5$ Jkg$^{-1}$ specific heat capacity of water 4.2 x 10$^3$ J kg$^{-1}$ K$^{-1}$]

Accepted Answer

C. 40.32 kJ

Answer

A. 4.80 kJ

Answer

B. 20.16 kJ

Answer

D. 22.17 kJ

Question 18

The maximum and minimum thermometer reads the

Accepted Answer

D. the maximum temperature during the day and minimum temperature at night from the last reset

Answer

A. the maximum temperature during the day and the minimum temperature at night at all times.

Answer

B. the maximum temperature at night and minimum temperature during the day from the last reset

Answer

C. the maximum temperature at night and minimum temperature during the day at all times

Question 19

A device consumes 100 W of power when connected to a 120 V source. Calculate its resistance.

Accepted Answer

D. 144$\Omega$

Answer

A. 1.2$\Omega$

Answer

B. 12,000 $\Omega$

Answer

C. 20.0$\Omega$

Question 20

An electron of mass 9.1 x 10$^{-31}$ kg moves with a speed of 2.0 x 10$^6$ ms$^{-1}$ round the nucleus of an atom in a Circular path of radius 6.1 x 10(^{11}$ m. Determine the angular speed of the electron.

Accepted Answer

A. 3.28 x 10$^{16}$ rad s$^{-1}$

Answer

B. 8.55 x 10$^{3}$ rad s$^{-1}$

Answer

C. 9.11 x 10$^{13}$ rad s$^{-1}$

Answer

D. 5.22 x 10$^{15}$ rad s$^{-1}$

Question 21

An electron of mass 9.1 x 10$^{-31}$ kg moves with a speed of 2.0 x 10$^6$ ms$^{-1}$ round the nucleus of an atom in a Circular path of radius 6.1 x 10$^{11}$ m. Calculate the centripetal force acting on the electron.

Accepted Answer

B. 6.0 x 10$^{-8}$N

Answer

A. 7.7 x 10$^{47}$ N

Answer

C. 3.0 x 10$^{-14}$N

Answer

D. 1.3 x 10$^{-26}$N

Question 22

Which of the following characteristics of waves can a ripple tank be used to demonstrate? I. Reflection II. Refraction III. Diffraction

Accepted Answer

A. I, II and Ill

Answer

B. ll and ll only

Answer

C. l and lII only

Answer

D. I and II only

Question 23

Which of the following graphs above of a charge Q against potential difference V across the capacitor is correct?

Accepted Answer

C. C

Answer

A. A

Answer

B. B

Answer

D. D

Question 24

Which of the following materials does not serve as a safety device in electrical circuits?

Accepted Answer

A. Connecting wires

Answer

B. Earth wire

Answer

C. Fuse

Answer

D. Switch

Question 25

A loaded spring is set in simple harmonic motion. The force that tends to restore the load to its equilibrium position is

Accepted Answer

B. elastic

Answer

A. adhesive

Answer

C. frictional

Answer

D. gravitational

Question 26

The mass of a load is doubled while the force acting on it is halved. The resulting acceleration of the load is

Accepted Answer

B. quartered

Answer

A. quadrupled

Answer

C. halved

Answer

D. doubled

Question 27

Which of the following cases cannot produce total internal reflection? A light ray travelling from

Accepted Answer

C. air to water

Answer

A. glass to water

Answer

B. kerosene to air

Answer

D. water to ice

Question 28

An instrument used to measure relative humidity is the?

Accepted Answer

A. hygrometer

Answer

B. hydrometer

Answer

C. pyrometer

Answer

D. manometer

Question 29

Which of the following liquids has the highest surface tension?

Accepted Answer

B. Cold water

Answer

A. Soapy water

Answer

C. Hot water

Answer

D. oily water

Question 30

An a.c. the generator can be converted to a d.c. generator by replacing the

Accepted Answer

D. slip rings with a commutator

Answer

A. commutator with an armature

Answer

B. armature with a commutator

Answer

C. commutator with slip rings

Question 31

Which of the following instruments can be used to compare the magnitudes of charges on two given bodies?

Accepted Answer

C. Gold-leaf electroscope

Answer

A. Electrophorus

Answer

B. Ebonite rod

Answer

D. Proof planes

Question 32

Which of the following waves is not mechanical?

Accepted Answer

C. Radio waves

Answer

A. Waves in pipes

Answer

B. Water waves

Answer

D. Sound waves

Question 33

A freshly demagnetized bar magnet is placed in the East-West direction to ensure that

Accepted Answer

A. the molecular magnets remain randomly arranged.

Answer

B. the molecular magnets are properly aligned

Answer

C. it is affected by the earth's magnetic field

Answer

D. the magnetic domains are within the earth's field

Question 34

A small amount of air is introduced into the vacuum above the mercury in a mercury barometer tube. The mercury level goes down because the air molecules

Accepted Answer

B. increase the pressure above the mercury.

Answer

A. heat the mercury and make it expand

Answer

C. cool the mercury and make it contract.

Answer

D. decrease the pressure above the mercury

Question 35

In which of the following media is the speed of sound the least?

Accepted Answer

A. Air

Answer

B. Brass

Answer

C. Water

Answer

D. Wood

Question 36

A body of mass 2 kg is released from a point 100 m above the ground. Calculate its kinetic energy 80m  from the point of release.

Accepted Answer

A. 1600 J

Answer

B. 900 J

Answer

C. 600 J

Answer

D. 200 J

Question 37

A transverse pulse of frequency 9 Hz traves 4.5m in 0.6 s. Calculate the wavelength of the pulse.

Accepted Answer

C. 0.83 m

Answer

A. 3.33 m

Answer

B. 0.30 m

Answer

D. 1.20 m

Question 38

Two bodies of masses 3.0 kg and 2.0 kg are separated by a distance of 50 cm. Calculate the force of attraction between them. [G = 6.67 x 10$^{-11}$ Nm$^2$ kg$^2$]

Accepted Answer

A. 1.6 x 10$^{-9}$N

Answer

B. 1.3 x 10$^{3}$N

Answer

C. 2.3 x 10$^{3}$N

Answer

D. 5.0x 10$^{3}$N

Question 39

The induced current in a coil always flows in a direction so as to oppose the change that causes it. This statement is known as

Accepted Answer

B. Lenz's law

Answer

A. Coulomb's law

Answer

C. Faraday's law

Answer

D. Ampere's law

Question 40

In an elastic collision, momentum is conserved as well as well as?

Accepted Answer

B. kinetic energy

Answer

A. velocity

Answer

C. potential energy

Answer

D. speed

Question 41

Which of the following quantities is a vector?

Accepted Answer

B. Momentum

Answer

A. Volume

Answer

C. Energy

Answer

D. Speed

Question 42

An 800 kg car moving at 80 km hr$^{-1}$ collides with a 1200 kg car moving at 40 km hr$^{-1}$ in the same direction. If the cars stick together, calculate their common velocity.

Accepted Answer

D. 56 km hr$^{-1}$

Answer

A. 60 km hr$^{-1}$

Answer

B. 8 km hr$^{-1}$

Answer

C. 40 km hr$^{-1}$

Question 43

The area under a velocity-time graph represents

Accepted Answer

D. distance

Answer

A. speed

Answer

B. acceleration

Answer

C. moment

Question 44

Which of the following statements about a moving object is correct?

Accepted Answer

C. At a steady velocity, the resultant force acting on it must be equal to zero

Answer

A. When accelerating, the resultant force acting on it must be equal to zero.

Answer

B. There must always be a non-zero resultant force acting on it.

Answer

D. At a steady velocity, the air resistance must be equal to zero.

Question 45

Which of the following thermometers is used to measure the temperature of the human body?

Accepted Answer

B. Alcohol-in-glass thermometer

Answer

A. Thermocouple

Answer

C. Gas thermometer

Answer

D. Platinum resistance thermometer

Question 46

Which property of a wave remains constant when the wave travels from one medium into another?

Accepted Answer

D. Frequency

Answer

A. Amplitude

Answer

B. Wavelength

Answer

C. Velocity

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