2014 Physics WAEC (WASSCE) Objective Past Questions (Paper 1)

A ball falling through a viscous liquid is acted upon by

An object of mass m moves with a uniform speed v round a circular path of radius r. If its angular speed is ω, the magnitude of the centripetal force acting on it is

When an elastic material is stretched by a force, the energy stored in it is

If no net force acts on an object, the object maintains a state of rest or constant speed in a straight line. The above is a statement of Newton’s

Which of the velocity-time graphs below correctly describes the motion of a body by a force that is equal to the frictional force acting on it?

When the linear momentum of a body is constant, the net force acting on it

Which of the following pairs of physical quantities is made up of vectors?

The knowledge of surface tension is applied in the following areas except in

A body is projected vertically upwards with a speed of 10 ms^-1 from a point 2m above the ground. Calculate the total time taken for the body to reach the ground.

[g = 10 ms^-2]

A car starts from rest and covers a distance of 40 m in 10 s. Calculate the magnitude of its acceleration.

The diagram above illustrates a uniform metre rule which is balanced on a pivot by some masses. Calculate the value of M

The period of a simple pendulum X is 5 s. What is the period of a simple pendulum Y which makes 50 vibrations in the same time it takes X to make 20 vibrations?

Alcohol of mass 21 g and density 0.7 gcm^-3 is mixed with 10 g of water. Determine the density of the mixture.

[density of water = 1.0 gcm^-3]

A device that converts mechanical energy into electrical energy is

The S.I unit of power is

A screw-jack has the distance between its successive threads as P and the length of its tommy bar as r. Its velocity ratio is given by the expression

Heat transfer by conduction is similar to wave motion because

The temperature at which the water vapour in the air saturates the air and begins to condense is known as

The change of state from solid to liquid occurs

Which of the following types of thermometers can be used to measure a range of temperatures from -50°C to 50°C?

I. Clinical

II. Mercury

III. Alcohol-in-glass

A body of mass M kg rests on a plane inclined at an angle θ to the horizontal. The component of the weight of the body parallel to the plane is

A quantity of water at 20^oC is mixed with another quantity of water at 70^oC. The final steady temperature of the mixture is 40^oC. Determine the ratio of the mass of the cold water to that of the hot water.

The mass of an empty density bottle is 30 g. When filled with a liquid, the mass of the bottle and the liquid is 40 g. On heating the filled bottle through 40°C, the mass reduces to 38 g. Calculate the apparent cubic expansivity of the liquid.

A car travelling at 30 ms^-1 overcomes a frictional resistance of 100 N while moving. Calculate the power developed by the engine.

[1 hp = 0.75 kW]

The quality of a note depends on its

A transverse wave can be distinguished from a longitudinal wave by

The superposition of waves to produce maximum or zero effect at a point is known as

Refraction of light differs from reflection in that, in refraction:

I. at least two media are involved.

II. there is a change in the direction of the ray.

III. the speed of the ray changes.

Which of the statements above is/are correct?

Which of the following relations about the focal length f_o of the objective and focal length f_e of the eye piece of a compound is correct?

The functional difference between a lens and a mirror is that a lens

The diagram above illustrates an electromagnetic wave travelling with speed 3.0 × 10⁸ ms^-1. Calculate the wavelength of the wave

An observer hears an echo 1.26 seconds after blowing a whistle near a cliff. Calculate the distance of the observer from the cliff.

[speed of sound in air = 330 ms^-1]

A fish inside a pond appears to be at a depth of 1.5 m when viewed vertically from above. The refractive index of the water in the pound is 1.3. Calculate the apparent displacement of the fish

An object is placed in front of two plane mirrors inclined at 60º to each other. Determine the number of the images formed.

An ammeter can be adapted to measure potential difference by using a

The region around a magnet in which magnetic force can be expressed is known as

In an a.c circuit when the supply voltage frequency is equal to the resonant frequency, the current

The energy stored in a simple cell is

Which of the following conditions occur at resonance in a series RLC circuit?

I. Impedance equalS resistance

II. Current is maximum

III. Reactance is maximum

IV. Current and voltage are 90^o out of phase

An electric motor converts

A  15 μF capacitor is connected to a 240 V, 50 Hz a.c. source. Calculate the reactance of the capacitance

\(\scriptsize \pi = 3.142\)

Two identical charges situated 20 cm apart in a vacuum repel each other with a force of 1.0 N. Calculate the value of each charge.

\(\left[\scriptsize (4\pi \varepsilon_o)^{-1} = 9 \: \times \: 10^9 \: Nm^2C^{-2}\right]\)

In the circuit diagram above, E is a battery of negligible internal resistance. If its e.m.f is 9.0V. Calculate the current in the circuit

A wire of length 100 cm has a resistance of 10 Ω. If its cross-sectional area is 0.005 cm², determine its resistivity.

A transformer has 400 turns of wire in the primary coil and 40 turns in the secondary coil. If the input voltage is 150 Volts. Calculate the magnitude of the output voltage

The circuit above illustrates a standard resistor R, voltage source E and a lamp L connected in series. If the temperature of R is increased, the brightness of the lamp will

The energy required to separate the nucleus in an atom completely is known as

Which of the following statements is the major advantage of nuclear fusion over nuclear fission?

An aluminum foil is placed across a beam of radiation from a radioactive source. Which of the following types of radiation will be stopped by it?

An element of nucleon number P and atomic number Q emits an alpha particle from its nucleus. The resultant numbers of the new element formed are respectively