2013 WAEC (WASSCE) Physics Past Questions & Answers

Question 1

The volume of a given mass of gas at 27oC and 800 mmHg is 76cm2. Calculate its volume at s.t.p

Accepted Answer

B. 72.8 cm3

Answer

A. 100.0 cm3

Answer

C. 60.0 cm3

Answer

D. 36.4 cm3

Question 2

Images formed by a convex mirror are always

Accepted Answer

B. behind the mirror

Answer

A. magnified

Answer

C. real

Answer

D. inverted

Question 3

The maximum displacement on either side of the equilibrium position of an object in simple harmonic motion represents

Accepted Answer

B. amplitude

Answer

A. period

Answer

C. wavelength

Answer

D. frequency

Question 4

Solid friction, like viscosity is

Accepted Answer

D. in opposition to motion

Answer

A. independent of the surface area in contact

Answer

B. independent of the relative motion between layers

Answer

C. dependent on normal reaction

Question 5

The velocity ratio of an inclined plane

Accepted Answer

B. increases with decrease in the angle of inclination

Answer

A. increases with increase in the angle of inclination

Answer

C. decreases with decrease in the angle of inclination

Answer

D. is independent of the angle of inclination

Question 6

The rising of a liquid in an open and ended glass tube of narrow bore is

Accepted Answer

C. capillarity

Answer

A. osmosis

Answer

B. adhesion

Answer

D. surface tension

Question 7

Which of the following statements about waves in pipes is correct?

Accepted Answer

C. only odd harmonics are possible in closed pipes

Answer

A. for open pipes, there is only one end correction to be accounted for

Answer

B. for closed pipes, there are two end corrections to be accounted for

Answer

D. all harmonics are possible in closed pipes

Question 8

When a person holds a negatively charges metal rod and stands bare-footed on the ground, how will the charges leak?

Accepted Answer

A. negative charges flows to the ground through the person's body

Answer

B. positive charges flow from the ground through his body to neutralize the negative charges

Answer

C. positive charges in the air neutralizes the negative charges the person is holding

Answer

D. negative charges will leak through the air

Question 9

Which of the following units is equivalent to the watt?

Accepted Answer

B. kgm2s-3

Answer

A. kg$ms^{-2}$

Answer

C. kgm2s-2

Answer

D. kgm2s-1

Question 10

Which of the following instruments is used to determine the accurate value of the electromotive force of a cell?

Accepted Answer

D. potentiometer

Answer

A. voltmeter

Answer

B. meterbridge

Answer

C. voltameter

Question 11

Highly polished silvery surfaces are

Accepted Answer

A. poor absorbers and poor emitters of radiation

Answer

B. poor absorbers and good emitters of radiation

Answer

C. good absorbers and poor emitters of radiation

Answer

D. good absorbers and good emitters of radiation

Question 12

Which of the following statements about the use of radioisotopes is not correct? They are used to

Accepted Answer

D. locate broken bones

Answer

A. induce mutations in plants and animals to obtain new and improved varieties

Answer

B. trace the paths of metabolic processes in plants and animals

Answer

C. estmate the age of rocks

Question 13

The refractive index of a material is 1.5. Calculate the critical angle at the glass-air interface

Accepted Answer

D. 42o

Answer

A. 19o

Answer

B. 21o

Answer

C. 39o

Question 14

A string under tension produces a note of frequency 14Hz. Determine the frequency when the tension is quadrupled.

Accepted Answer

C. 28Hz

Answer

A. 14Hz

Answer

B. 18Hz

Answer

D. 56Hz

Question 15

At which position should an object be placed in front of a concave mirror in order to obtain an image which is of the same size as the object?

Accepted Answer

A. at the centre of curvature

Answer

B. at the principal focus

Answer

C. between the pole and principal focus

Answer

D. between the centre of curvature and principal focus

Question 16

A body of mass 20g projected vertically upwards in vacuum returns to the point of projection after 1.2s. [g = 10ms$^{-2}$]. Calculate the speed of projection

Accepted Answer

B. 6.0$ms^{-1}$

Answer

A. 1.2$ms^{-1}$

Answer

C. 12.0$ms^{-1}$

Answer

D. 0.6$ms^{-1}$

Question 17

An electric heater has a resistance of 50 $\Omega$ . When it is immersed in water and connected to mains source, it draws a current of 4.0A. Calculate the heat gained by the water if the heater is switched on for 2 minutes, assuming no heat losses to the surroundings

A.4200J
B.1600J
C.24000J
D.96000J

Show answer

Answer: D. 96000J

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Accepted Answer

D. 96000J

Answer

A. 4200J

Answer

B. 1600J

Answer

C. 24000J

Question 18

A potential difference of 12V is applied across the ends of a 6$\Omega$ resistor for 10 minutes. Determine the quantity of heat generated

Accepted Answer

C. 14400J

Answer

A. 720J

Answer

B. 1200J

Answer

D. 43200J

Question 19

Which of the following statements about pressure in a liquid is correct?

Accepted Answer

A. the pressure in a liquid increases with depth

Answer

B. the higher the density of a liquid, the lower the pressure it exerts

Answer

C. pressure in liquid act only in a direction perpendicular to the sides of the containing vessel

Answer

D. pressure is independent of the acceleration due to gravity

Question 20

A coil of inductance 0.12 H and resistance 4$\Omega$, is connected across a 240V, 50Hz supply. Calculate the current through it. [$\pi$ = 3.142]

Accepted Answer

A. 6.3A

Answer

B. 33.3A

Answer

C. 37.2A

Answer

D. 40.0A

Question 21

A charge of 2.0 x 10$^{-5}$ C experiences a force of 80N in a uniform electric field. Calculate the magnitude of the electric field intensity

Accepted Answer

B. 4.0 x 106 NC-1

Answer

A. 8.0 x 106 NC-1

Answer

C. 4.0 x 104 NC-1

Answer

D. 2.0 x 104 NC-1

Question 22

Which of the following phenomena supports the theory that waves have a particle nature?

Accepted Answer

B. photoelectric effect

Answer

A. electron diffraction

Answer

C. diffraction of light

Answer

D. x-ray interference

Question 23

The minimum energy required to cause photoelectric emission when the surface of a metal is irradiated with electromagnetic radiation of suitable frequency is called

Accepted Answer

C. work function

Answer

A. critical energy

Answer

B. ionization energy

Answer

D. planck's constant

Question 24

The work function of a metal is 2.56 x 10-19J. Calculate the frequency of a photon whose energy is required to eject from the metal an electron with kinetic energy of 3.0ev. [1 eV = 1.6 x 10-19J, h = 6.6 x 10-34Js]

Accepted Answer

C. 1.12 x 1015Hz

Answer

A. 5.56 x 1019Hz

Answer

B. 1.66 x 1019Hz

Answer

D. 8.42 x 1014Hz

Question 25

Which of the following devices does not makes use of eddy current for its action? A/An

Accepted Answer

D. induction coil.

Answer

A. galvanometer

Answer

B. speedometer

Answer

C. induction furnace

Question 26

The slope of a linear distance-times graph represents

Accepted Answer

C. speed

Answer

A. acceleration

Answer

B. displacement

Answer

D. velocity

Question 27

The total area under a force-velocity graph represents

Accepted Answer

C. power

Answer

A. energy

Answer

B. momentum

Answer

D. pressure

Question 28

When salt is dissolved in water, the freezing point of the water

Accepted Answer

B. decreases

Answer

A. increases

Answer

C. remains the same

Answer

D. increases and later decrease

Question 29

A body of mass 2kg is released from rest on a plane inclined at an angle of 60° to the horizontal. Calculate the acceleration of the body down the plane.[g = 10ms$^{-2}$]

Accepted Answer

D. 8.7$ms^{-2}$

Answer

A. 3.1$ms^{-2}$

Answer

B. 5.2$ms^{-2}$

Answer

C. 6.0$ms^{-2}$

Question 30

Which of the following types of thermometer is used for the calibration of other thermometers?

Accepted Answer

B. constant volume gas thermometer

Answer

A. liqud-in-glass thermometer

Answer

C. optical pyrometer

Answer

D. thermocouple

Question 31

The equation of a certain progressive transverse wave is y = 2 sin 2 $\pi ( \frac{t}{0.01} - \frac{x}{30})$, where x and y are in cm and t in seconds. Calculate the period of the wave.

Accepted Answer

B. 0.010s

Answer

A. 0.001s

Answer

C. 10.000s

Answer

D. 100.000s

Question 32

The magnitude of the expansion or contraction of a substance depends on the i. temperature change ii. nature of the substance iii. size of the substance. Which of the statements above are correct?

Accepted Answer

D. i, ii and iii

Answer

A. i and ii only

Answer

B. ii and iii only

Answer

C. i and iii only

Question 33

A body of mass 11kg is suspended from a ceiling fan by an aluminum wire of length 2m and diameter 2mm. Calculate the elastic energy stored in the wire [Young's modulus of aluminum is 7.0 x $10^10Nm^{-2}$, g = 10m$s^{-2}$, $\pi$ = 3.142]`

Accepted Answer

B. 5.5 x 10-2J

Answer

A. 1.1 x 10-1J

Answer

C. 1.1 x 10-4J

Answer

D. 5.5 x 10-8J

Question 34

A body of mass 20g projected vertically upwards in vacuum returns to the point of projection after 1.2s. [g = 10$ms^{-2}$]. Determine the potential energy of the body at the maximum height of its motion

Accepted Answer

A. 0.36J

Answer

B. 0.72J

Answer

C. 360.00J

Answer

D. 720.00J

Question 35

Which of the following radiations has it's frequency lower than that of infrared radiation?

Accepted Answer

D. radio waves

Answer

A. Utra-violet rays

Answer

B. gamma rays

Answer

C. x-rays

Question 36

A diverging lens of focal length 30cm produces an image 20cm from the lens. Determine the object distance

Accepted Answer

D. 60cm

Answer

A. 10cm

Answer

B. 12cm

Answer

C. 50cm

Question 37

Which of the following statements about the Galilean telescope is not correct?

Accepted Answer

A. the final image is inverted

Answer

B. it is shorter than terrestial telescope

Answer

C. the final image is erect

Answer

D. it has a small field of view

Question 38

The capacitance of parallel plates capacitors varies

Accepted Answer

C. inversely as the distance between the plates

Answer

A. inversely as the square of the distance between the plates

Answer

B. directly as the square of the distance between the plates

Answer

D. directly as the distance between the plate

Question 39

Ice of mass 10g at 5°C was completely converted to water at 0°C, calculate the quantity of heat used. [specific heat capacity of ice = 2.1 Jg$^{-1}$K$^{-1}$, specific latent heat of fusion of ice = 336 Jg$^{-1}$]

Accepted Answer

C. 3465J

Answer

A. 105J

Answer

B. 3255J

Answer

D. 16821J

Question 40

Which of the following particles are termed nucleons in a neutral atom?

Accepted Answer

A. protons and neutrons

Answer

B. neutrons and electrons

Answer

C. protons and electrons

Answer

D. protons, electrons and neutrons

Question 41

From Newton's first law of motion,

Accepted Answer

C. the net force acting in uniform linear motion is zero

Answer

A. a body can only undergo translational motion

Answer

B. once a body remains at rest no force acts on it

Answer

D. a body's inertia is its weight

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