Physics Mock 2018

WASSCE style · Study mode

Physics Mock 2018

Question 1 of 50

The distance light travels in one year is a

A. light-year B. parsec C. astronomical unit D. kilometre

Question 2 of 50

The galaxy in which our solar system is found is the

A. Milky Way B. Andromeda C. Magellanic Cloud D. Sombrero

Question 3 of 50

The theory that the universe began from a single hot, dense point is the

A. Big Bang theory B. steady state theory C. plate tectonics D. cell theory

Question 4 of 50

The largest planet in the solar system is

A. Jupiter B. Saturn C. Earth D. Neptune

Question 5 of 50

A generator converts

A. mechanical energy to electrical energy B. electrical to mechanical energy C. light to electrical energy D. heat to light

Question 6 of 50

Converting a.c. to d.c. is called

A. rectification B. amplification C. modulation D. induction

Question 7 of 50

Half-wave rectification uses

A. one diode B. four diodes C. no diodes D. two capacitors only

Question 8 of 50

A car moving at 30 m/s is brought to rest in 6 s. Its deceleration is

A. 36 m/s² B. 180 m/s² C. 0.2 m/s² D. 5 m/s²

Question 9 of 50

The velocity of a body falling freely from rest after 3 s (g = 10 m/s²) is

A. 15 m/s B. 30 m/s C. 45 m/s D. 3 m/s

Question 10 of 50

Which instrument is most suitable for measuring the diameter of a thin wire?

A. vernier caliper B. metre rule C. micrometer screw gauge D. measuring tape

Question 11 of 50

The slope of a distance–time graph gives the

A. force B. acceleration C. distance D. speed

Question 12 of 50

A body of mass 2 kg moving at 10 m/s has momentum

A. 5 kg m/s B. 100 kg m/s C. 20 kg m/s D. 12 kg m/s

Question 13 of 50

The efficiency of a machine that does 300 J of useful work for 400 J input is

A. 133% B. 75% C. 25% D. 70%

Question 14 of 50

The loudness of a sound depends on its

A. frequency B. amplitude C. wavelength D. speed

Question 15 of 50

The reactance of an inductor increases when the frequency

A. increases B. decreases C. is zero D. is constant

Question 16 of 50

Faraday's law states that the induced e.m.f. is proportional to the

A. rate of change of magnetic flux B. resistance C. current only D. mass of the coil

Question 17 of 50

Lenz's law states that the induced current

A. opposes the change producing it B. aids the change C. is always zero D. flows clockwise only

Question 18 of 50

The period of a simple pendulum depends on its

A. length B. mass C. amplitude (for small swings) D. colour

Question 19 of 50

In SHM, acceleration is always directed

A. towards the equilibrium position B. away from equilibrium C. along the velocity D. upward

Question 20 of 50

A capacitor connected across a rectifier output is used to

A. smooth the d.c. output B. increase ripple C. reverse current D. step up voltage

Question 21 of 50

A Zener diode in a power supply is used for

A. voltage regulation B. rectification only C. amplification D. oscillation

Question 22 of 50

A body starts from rest and accelerates at 2 m/s² for 5 s. The distance covered is

A. 10 m B. 25 m C. 50 m D. 5 m

Question 23 of 50

A stone dropped from a height takes 2 s to reach the ground (g = 10 m/s²). The height is

A. 5 m B. 10 m C. 40 m D. 20 m

Question 24 of 50

A 50 kg boy climbs stairs 4 m high in 10 s (g = 10 m/s²). His power is

A. 2,000 W B. 200 W C. 20 W D. 500 W

Question 25 of 50

A uniform metre rule is balanced at its 50 cm mark. A 2 N weight hung at 20 cm is balanced by a weight at 80 cm of

A. 3 N B. 4 N C. 1 N D. 2 N

Question 26 of 50

A pulley system with 4 supporting strands has a velocity ratio of

A. 8 B. 2 C. 4 D. 1

Question 27 of 50

The coefficient of static friction is the ratio of

A. velocity to time B. weight to mass C. force to area D. limiting friction to normal reaction

Question 28 of 50

A body of mass 5 kg falls from a height of 20 m. Its kinetic energy just before hitting the ground is (g = 10 m/s²)

A. 100 J B. 1,000 J C. 500 J D. 2,000 J

Question 29 of 50

The temperature of a body is a measure of the

A. its mass B. total heat it contains C. average kinetic energy of its molecules D. its volume

Question 30 of 50

Land breezes blow at night from land to sea because

A. the land is warmer B. the sea is warmer than the land at night C. there is no air D. the moon pulls the air

Question 31 of 50

The boiling point of water decreases at high altitude because

A. the air is colder B. gravity is stronger C. atmospheric pressure is lower D. water is denser

Question 32 of 50

An echo is heard 2 s after a sound is made in front of a cliff. If the speed of sound is 340 m/s, the cliff is

A. 1,360 m away B. 680 m away C. 170 m away D. 340 m away

Question 33 of 50

A ray of light passes through the optical centre of a lens

A. by total reflection B. parallel to the axis C. through the focus D. without deviation

Question 34 of 50

The image formed on the retina of the eye is

A. virtual and upright B. real and inverted C. virtual and inverted D. real and upright

Question 35 of 50

Two 4 Ω resistors in series are connected to a 12 V battery. The current is

A. 6 A B. 3 A C. 1.5 A D. 0.67 A

Question 36 of 50

A car accelerates uniformly from rest to 20 m/s in 5 s. The distance travelled is

A. 100 m B. 50 m C. 4 m D. 25 m

Question 37 of 50

A stone dropped from rest falls for 3 s (g = 10 m/s²). Its final velocity is

A. 15 m/s B. 45 m/s C. 30 m/s D. 3.3 m/s

Question 38 of 50

The resultant of forces 3 N and 4 N acting at right angles is

A. 7 N B. 5 N C. 1 N D. 12 N

Question 39 of 50

A car travelling at 72 km/h has a speed of

A. 200 m/s B. 72 m/s C. 7.2 m/s D. 20 m/s

Question 40 of 50

A body decelerates uniformly from 30 m/s to rest in 6 s. The deceleration is

A. 180 m/s² B. 5 m/s² C. 0.2 m/s² D. 36 m/s²

Question 41 of 50

The area under a velocity–time graph gives

A. momentum B. acceleration C. force D. displacement

Question 42 of 50

A 100 Ω resistor, 0.5 H inductor and 20 μF capacitor are in series at 50 Hz. The inductive reactance is about

A. 157 Ω B. 50 Ω C. 314 Ω D. 15.7 Ω

Question 43 of 50

Two thin lenses of focal lengths 20 cm and 30 cm in contact have a combined focal length of

A. 12 cm B. 50 cm C. 25 cm D. 10 cm

Question 44 of 50

A straight conductor 0.5 m long moves at 4 m/s perpendicular to a 0.2 T field. The induced e.m.f. is

A. 0.4 V B. 4 V C. 1.6 V D. 0.04 V

Question 45 of 50

The acceleration of a body in SHM at displacement 0.05 m with ω = 4 rad/s is

A. 0.8 m/s² towards equilibrium B. 0.2 m/s² C. 16 m/s² D. 0

Question 46 of 50

A ball rolls off a table 1.25 m high with speed 2 m/s (g = 10 m/s²). It lands at a horizontal distance of

A. 2.5 m B. 2 m C. 0.5 m D. 1 m

Question 47 of 50

The relative velocity of car A (30 m/s east) with respect to car B (20 m/s west) is

A. 10 m/s east B. 50 m/s east C. 50 m/s west D. 10 m/s west

Question 48 of 50

The dimension of momentum is

A. MT⁻¹ B. MLT⁻² C. ML²T⁻² D. MLT⁻¹

Question 49 of 50

A body moves in a circle of radius 2 m at 4 m/s. Its centripetal acceleration is

A. 16 m/s² B. 2 m/s² C. 8 m/s² D. 32 m/s²

Question 50 of 50

A stone is thrown horizontally at 10 m/s from a cliff 45 m high. It lands from the base at (g = 10 m/s²)

A. 45 m B. 30 m C. 10 m D. 90 m

Questions written by OtisamLMS in the style of the WASSCE. They are not WAEC past questions.