2017 WAEC (WASSCE) Physics Past Questions & Answers

Question 1

Which of the following statements is/ are correct? I. Gravitational potential due to a mass at a point a distance r away is proportional to $r^{2}$ II. Gravitational field strength is a vector quantity III. Gravitational intensity is proportional to the weight of a unit mass.

Accepted Answer

C. II only

Answer

A. I, II and III

Answer

B. III only

Answer

D. I only

Question 2

A ball is projected horizontally from the top of a tower. Neglecting air resistance, which of the following statements about its motion is/are correct? I. Vertical acceleration on the ball decreases as it falls II. The vertical force on the ball remains constant III. The vertical speed of the ball increases as it falls

A.I only
B.II only
C.I and II only
D.II and III only

Show answer

Answer: D. II and III only

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Accepted Answer

D. II and III only

Answer

A. I only

Answer

B. II only

Answer

C. I and II only

Question 3

A vapour whose molecules are in dynamic equilibrium with those of its own liquid is said to be

Accepted Answer

C. saturated

Answer

A. unsaturated

Answer

B. gaseous

Answer

D. diffused

Question 4

A body weighing 14N in air is partially immersed in water. If the mass of water displaced in the process is 200g, calculate the upthrust on the body. [g=10$m/s^{2}$]

Accepted Answer

A. 2.0N

Answer

B. 3.0N

Answer

C. 3.5N

Answer

D. 7.0N

Question 5

Which of the following processes is not a surface phenomenon?

Accepted Answer

A. Condensation

Answer

B. Evaporation

Answer

C. Photo Emission

Answer

D. Thermionic Emission

Question 6

Which of the following devices converts light energy to electrical energy?

Accepted Answer

C. Solar cell

Answer

A. Bulb

Answer

B. Television

Answer

D. Light emitting diode (LED)

Question 7

The force per unit charge experienced at a point in a field is the

Accepted Answer

C. electric field intensity

Answer

A. gravitational field strength

Answer

B. electric potential

Answer

D. magnetic field strength

Question 8

A motor of a corn mill machine operates on electrical energy of $1.44 	imes 10^{5}$J. If one-quarter of the energy is wasted on sound and heat, determine the efficiency of the machine.

Accepted Answer

D. 75%

Answer

A. 25%

Answer

B. 36%

Answer

C. 64%

Question 9

Which of the following pairs of concepts constitutes complementary variables as expressess by the Heinsberg uncertainty principle?

Accepted Answer

C. Position and momentum

Answer

A. Momentum and time

Answer

B. Energy and acceleration

Answer

D. Velocity and Momentum

Question 10

A transformer connected to a 240$V_{r.m.s}$ has 3000 turns in its primary coil and 500 turns in its secondary coil. Calculate the output voltage.

Accepted Answer

C. 40V

Answer

A. 4000V

Answer

B. 400V

Answer

D. 4V

Question 11

A body can undergo the following types of motion except

Accepted Answer

D. relative

Answer

A. random

Answer

B. rotational

Answer

C. translational

Question 12

A plane is inclined at an angle $	heta$ to the horizontal. Its velocity ratio is

Accepted Answer

C. $\frac{1}{sin	heta}$

Answer

A. $sin	heta$

Answer

B. $tan	heta$

Answer

D. $\frac{1}{tan	heta}$

Question 13

A motorist travelling at 72$kmh^{-1}$ had his eyes shut for 0.4s during a hard sneeze. Calculate the distance covered by him during this time interval.

Accepted Answer

D. 8.0m

Answer

A. 50.0m

Answer

B. 28.8m

Answer

C. 18.0m

Question 14

Which of the following statements about the 3rd overtone of a vibrating air column of an open pipe is correct? It has

Accepted Answer

A. 4 nodes

Answer

B. 5 nodes

Answer

C. 3 antinodes

Answer

D. 4 antinodes

Question 15

A rainbow is formed when sunlight is incident on water droplets suspended in the air due to

Accepted Answer

C. dispersion

Answer

A. interference

Answer

B. refraction

Answer

D. diffraction

Question 16

A body accelerates uniformly from rest at 2$ms^{-2}$. Calculate its velocity when it has travelled a distance of 9m.

Accepted Answer

C. 6.0$ms^{-1}$

Answer

A. 3.0$ms^{-1}$

Answer

B. 4.5$ms^{-1}$

Answer

D. 18.0$ms^{-1}$

Question 17

The energy stored in a spring of stiffness constant k = 2000$Nm^{-1}$ when extended 4cm is

Accepted Answer

B. 1.60J

Answer

A. 0.16J

Answer

C. 16.00J

Answer

D. 160.00J

Question 18

Two plane mirrors are inclined at an angle 20° to each other. Determine the number of images formed when an object is placed between them.

Accepted Answer

A. 17

Answer

B. 18

Answer

C. 19

Answer

D. 20

Question 19

The diagrams above illustrate electrical connections to the element of an electric pressing iron.In which of the connections is the fuse correctly fixed?

Accepted Answer

C. III

Answer

A. I

Answer

B. II

Answer

D. IV

Question 20

The main reason why a.c. is transmitted at very high voltage and low current is that

Accepted Answer

D. reduces heat loss

Answer

A. flows faster through the conductor

Answer

B. can be stepped down

Answer

C. is cheaper to generate

Question 21

A lamp rated 100W, 240V is lit for 5hours. Calculate the cost of lighting the lamp if 1kWh of electrical energy cost N5.

Accepted Answer

A. N2.50

Answer

B. N3.20

Answer

C. N6.50

Answer

D. N9.60

Question 22

Plane waves through a narrow gap emerge as circular waves. This phenomenon is known as

Accepted Answer

D. diffraction

Answer

A. interference

Answer

B. dispersion

Answer

C. refraction

Question 23

Ice of mass 50g at 0°C was completely melted by 70% of the total heat energy supplied. Calculate the total heat energy supplied  [Specific latent heat of fusion of ice = 336$Jg^{-1}$]

Accepted Answer

D. 24000J

Answer

A. 2400J

Answer

B. 6800J

Answer

C. 7251J

Question 24

Thermal energy added or removed from a substance that changes the state of the substance is called

Accepted Answer

A. latent heat

Answer

B. heat of reaction

Answer

C. calorimetry

Answer

D. specific heat

Question 25

Consider the wave equation:  $y =  10sin(x - 50t)$, What does the number 10 represent?

Accepted Answer

C. Amplitude

Answer

A. Acceleration

Answer

B. Speed

Answer

D. Wavelength

Question 26

Which of the following objects is not a conductor of electricity?

Accepted Answer

D. Dry wood

Answer

A. The Earth

Answer

B. Human body

Answer

C. Iron rod

Question 27

The inverse of the time required for a wave to complete one full cycle is called

Accepted Answer

C. frequency

Answer

A. wavelength

Answer

B. period

Answer

D. amplitude

Question 28

Two bar magnets are placed near each other. Which of the following diagrams correctly illustrates the magnetic field pattern formed by the pair?

Accepted Answer

C. III

Answer

A. I

Answer

B. II

Answer

D. IV

Question 29

A ray of light incident at an angle $	heta$ in a rectangular prism grazes the surface of the prism on emerging from the prism. Determine the value of the angle. [Absolute refractive index of the material of the prism is 1.5]

Accepted Answer

A. 41.8°

Answer

B. 48.2°

Answer

C. 60.8°

Answer

D. 90.0°

Question 30

Which of the following is the dimension for impulse?

Accepted Answer

A. MLT$^{-1}$

Answer

B. MLT$^{-2}$

Answer

C. MLT

Answer

D. ML

Question 31

The angle at which a projectile must be fired to cover maximum range is

Accepted Answer

B. 45°

Answer

A. 30°

Answer

C. 60°

Answer

D. 90°

Question 32

The nucleon number of an atom is the total number of

Accepted Answer

D. protons and neutrons

Answer

A. electrons and protons

Answer

B. electrons and neutrons

Answer

C. neutrons minus electrons

Question 33

A body is whirled round a circular path at constant speed. Which of the following diagrams correctly indicates the direction of the body's velocity (v) and its acceleration (a)?

Answer

A. I

Answer

B. II

Answer

C. III

Answer

D. IV

Question 34

The maximum density of water occurs at a temperature of

Accepted Answer

B. 4°C

Answer

A. 0°C

Answer

C. 37°C

Answer

D. 273°C

Question 35

Which of the following statements about Gamma radiation is correct? Gamma radiation can

Accepted Answer

C. be present naturally in our surroundings

Answer

A. be seen by the naked eye

Answer

B. not pass through an aluminium foil

Answer

D. be used as a tracer

Question 36

Which of the following statements about matter is not correct?

Accepted Answer

A. Molecules of solids move more freely than molecules of liquids and gases

Answer

B. Molecules of solids are more closely packed than those of liquids

Answer

C. Energy is required to break the intermolecular forces of attraction between molecules

Answer

D. Molecules of liquids move about within the liquid and they are in constant motion

Question 37

A chemical balance is used for measuring

Accepted Answer

B. mass

Answer

A. volume

Answer

C. thickness

Answer

D. density

Question 38

A converging lens of focal length 10cm forms an erect image three times the size of the real object. Calculate the distance between the image and the object.

Accepted Answer

C. 13.3cm

Answer

A. 6.6cm

Answer

B. 11.1cm

Answer

D. 20.0cm

Question 39

The opposition offered to an alternating current in a C-R series circuit is known as

Accepted Answer

A. impedance

Answer

B. resistance

Answer

C. reactance

Answer

D. friction

Question 40

Which of the following graphs correctly represents the relationship between the kinetic energy (K.E) and the displacement (d) from point of release of a swinging pendulum bob?

Accepted Answer

A. I

Answer

B. II

Answer

C. III

Answer

D. IV

2017 WAEC (WASSCE) Physics Past Questions

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