Physics Mock 2023

WASSCE style · Exam mode

Physics Mock 2023

Question 1 of 50

A gold-leaf electroscope is used to

A. store electricity B. measure current C. detect electric charge D. measure temperature

Question 2 of 50

Which of these materials is strongly attracted by a magnet?

A. copper B. aluminium C. iron D. brass

Question 3 of 50

A microphone is a transducer that changes

A. heat into sound B. electrical energy into sound C. light into heat D. sound energy into electrical energy

Question 4 of 50

Which device changes electrical energy into sound?

A. microphone B. loudspeaker C. solar cell D. thermistor

Question 5 of 50

The nucleus of an atom contains

A. protons and electrons B. electrons only C. protons and neutrons D. neutrons and electrons

Question 6 of 50

A lightning conductor protects a building by

A. making the building positive B. storing the lightning C. repelling clouds D. safely conducting charge to the earth

Question 7 of 50

Which radiation is the most penetrating?

A. alpha B. beta C. gamma D. visible light

Question 8 of 50

An electric bell works because it contains

A. a diode B. a permanent magnet only C. a capacitor D. an electromagnet

Question 9 of 50

The strength of an electromagnet can be increased by

A. reducing the current B. using a copper core C. increasing the current and the number of turns D. removing the core

Question 10 of 50

A wave has a frequency of 50 Hz and a wavelength of 4 m. What is its speed?

A. 12.5 m/s B. 200 m/s C. 54 m/s D. 0.08 m/s

Question 11 of 50

Which of these is a longitudinal wave?

A. light B. sound C. radio D. X-rays

Question 12 of 50

Sound cannot travel through

A. water B. steel C. a vacuum D. air

Question 13 of 50

A magnet can be demagnetised by

A. painting it B. keeping it with keepers C. storing it in pairs D. heating it strongly or hammering it

Question 14 of 50

Isotopes of an element have the same number of

A. neutrons but different numbers of protons B. protons but different numbers of neutrons C. nucleons D. electrons and neutrons

Question 15 of 50

An alpha particle is the same as

A. a neutron B. an electron C. a photon D. a helium nucleus

Question 16 of 50

A radioactive sample of 80 g has a half-life of 5 days. How much is left after 15 days?

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

Question 17 of 50

What are the dimensions of force?

A. ML²T⁻² B. MLT⁻¹ C. MLT⁻² D. MT⁻²

Question 18 of 50

Forces of 3 N and 4 N act at right angles on a body. What is the size of their resultant?

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

Question 19 of 50

A spring with a force constant of 200 N/m is stretched by 5 cm. What force is needed?

A. 4 N B. 1,000 N C. 40 N D. 10 N

Question 20 of 50

The law of flotation states that a floating object

A. displaces its own volume of fluid B. has no weight C. displaces its own weight of the fluid in which it floats D. is always denser than the fluid

Question 21 of 50

How much heat is needed to raise the temperature of 2 kg of water by 10 °C? (c = 4,200 J/kg K)

A. 8,400 J B. 84,000 J C. 840 J D. 42,000 J

Question 22 of 50

The heat needed to change 1 kg of a solid to liquid at its melting point, without a change in temperature, is its

A. specific heat capacity B. specific latent heat of fusion C. heat capacity D. thermal conductivity

Question 23 of 50

Steam at 100 °C causes worse burns than boiling water at 100 °C because steam

A. contains less energy B. is hotter C. gives out extra latent heat when it condenses on the skin D. is a better conductor

Question 24 of 50

A capacitor stores 6 μC of charge when the voltage across it is 3 V. What is its capacitance?

A. 18 μF B. 2 μF C. 0.5 μF D. 9 μF

Question 25 of 50

Capacitors of 2 μF and 3 μF are connected in parallel. What is the total capacitance?

A. 1.2 μF B. 5 μF C. 6 μF D. 1 μF

Question 26 of 50

The energy of a photon is given by

A. E = IVt B. E = mgh C. E = ½mv² D. E = hf

Question 27 of 50

A beta particle is

A. a neutron B. a helium nucleus C. a fast-moving electron D. a photon

Question 28 of 50

A projectile reaches its greatest range on level ground when launched at

A. 30° B. 45° C. 60° D. 90°

Question 29 of 50

A body moving in a circle at constant speed has an acceleration directed

A. upwards B. away from the centre C. along the tangent D. towards the centre

Question 30 of 50

A force of 20 N is needed to slide a box whose weight is 100 N at steady speed. What is the coefficient of friction?

A. 2 B. 5 C. 0.2 D. 0.02

Question 31 of 50

Fleming's left-hand rule gives the direction of the

A. magnetic field around a wire B. induced current in a generator C. force on a current-carrying conductor in a magnetic field D. electric field

Question 32 of 50

The bending of waves around obstacles or through gaps is

A. reflection B. diffraction C. refraction D. interference

Question 33 of 50

Electric field lines point

A. in no particular direction B. from negative to positive charges C. in circles around charges D. from positive to negative charges

Question 34 of 50

A transistor has three terminals called the

A. live, neutral and earth B. anode, cathode and grid C. emitter, base and collector D. source, drain and fuse

Question 35 of 50

The magnetic field lines around a straight wire carrying current are

A. straight lines away from the wire B. straight lines parallel to the wire C. absent D. concentric circles around the wire

Question 36 of 50

A body floats with 3/4 of its volume submerged in water. Its density is

A. 250 kg/m³ B. 1,333 kg/m³ C. 750 kg/m³ D. 1,000 kg/m³

Question 37 of 50

The specific heat capacity of a 2 kg metal block that needs 18,000 J to rise by 20 K is

A. 180 J/kg K B. 900 J/kg K C. 450 J/kg K D. 9,000 J/kg K

Question 38 of 50

Two capacitors of 3 μF and 6 μF are in series. Their combined capacitance is

A. 18 μF B. 9 μF C. 4.5 μF D. 2 μF

Question 39 of 50

The force between two charges 0.1 m apart is 9 N. If the separation becomes 0.3 m, the force becomes

A. 27 N B. 3 N C. 1 N D. 0.33 N

Question 40 of 50

After 3 half-lives, a sample has 25 g left. Its initial mass was

A. 100 g B. 75 g C. 200 g D. 150 g

Question 41 of 50

A 0.5 kg stone is whirled in a horizontal circle of radius 2 m at 4 m/s. The centripetal force is

A. 16 N B. 1 N C. 8 N D. 4 N

Question 42 of 50

A projectile launched at 40 m/s at 30° has a time of flight of (g = 10 m/s²)

A. 2 s B. 4 s C. 8 s D. 6.9 s

Question 43 of 50

A wire 0.5 m long carries 4 A at right angles to a field of 0.2 T. The force on it is

A. 0.4 N B. 4 N C. 1.6 N D. 0.1 N

Question 44 of 50

Two parallel wires carrying currents in the same direction

A. attract each other B. repel each other C. have no effect D. rotate

Question 45 of 50

In a stationary wave, the distance between adjacent nodes is

A. half a wavelength B. one wavelength C. a quarter wavelength D. two wavelengths

Question 46 of 50

A wire of length 2 m and area 1 × 10⁻⁶ m² stretches 1 mm under 100 N. Young's modulus is

A. 2 × 10⁸ Pa B. 2 × 10¹¹ Pa C. 5 × 10¹⁰ Pa D. 1 × 10¹¹ Pa

Question 47 of 50

How much heat is needed to change 0.5 kg of ice at 0 °C to water at 20 °C? (L = 3.36 × 10⁵ J/kg; c = 4,200 J/kg K)

A. 3.78 × 10⁵ J B. 1.68 × 10⁵ J C. 4.2 × 10⁴ J D. 2.10 × 10⁵ J

Question 48 of 50

The energy stored in a 10 μF capacitor charged to 100 V is

A. 0.5 J B. 0.05 J C. 1 J D. 0.1 J

Question 49 of 50

The threshold wavelength of a metal with work function 3.0 × 10⁻¹⁹ J is about (h = 6.6 × 10⁻³⁴ J s, c = 3 × 10⁸ m/s)

A. 2.2 × 10⁻⁷ m B. 6.6 × 10⁻⁷ m C. 1.0 × 10⁻⁶ m D. 4.5 × 10⁻⁷ m

Question 50 of 50

A projectile is launched at 40 m/s at 30° to the horizontal (g = 10 m/s²). Its horizontal range is about

A. 80 m B. 160 m C. 138.6 m D. 69.3 m

Time left

60:00

Answered0 / 50

Unanswered questions count as wrong.

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