2016 Physics WAEC Objective Past Questions

The dimensions of momentum are

The diagram given represents the graph of stress against strain for an elastic wire. The point Q on the graph is the

A ball is dropped from the top of a tower. Due to air resistance, it reaches terminal velocity.

Which of the following statement(s) about its motion is/are correct?

i. The acceleration of the ball is zero.

ii. The net force on the ball is zero.

iii. The velocity of the ball increases.

Which of the following substances lowers the surface tension of water?

An object of volume 400cm³ and 2.5gcm^-3 is suspended from a spring balance with half its volume immersed in water. Determine the reading on the spring balance. (Density of water = 1gcm^-3)

The diagram given illustrates a force-distance graph for the motion of a wooden block. Determine the work done on the block when moved through a distance of 5m.

The two positions of a body undergoing a uniformly accelerated motion are (10s, 10ms^-1) and (30s, 50ms^-1) on the velocity-time graph of the body. Calculate the magnitude of the acceleration of the body.

A uniform metre rule is balanced on a fulcrum placed at the 35cm mark by suspending a mass of 120g at the 10cm mark. Calculate the mass of the metre rule.

A plank is placed along the path on which a wheelbarrow containing sand is pushed at a construction site to prevent it from sticking as illustrated in the diagram given. The large area of the plank prevents the wheelbarrow from getting stuck by

When a body is thrown vertically upwards, its velocity at the maximum height is

Resonance occurs when one vibrating object causes a second object to vibrate at its own natural amplitude

The mouth piece of a telephone handset converts

In the clinical thermometer, the function of the kink is to

i. Prevent the back flow of mercury after use.

ii. Ensure the back flow of mercury after use.

iii. Maintain the thermometric property of mercury.

iv. Allow the temperature attained to be read.

Which of the following statements correctly defines the boiling point of a liquid? The temperature at which the

The diagram given is used to determine the

An aluminium rod of length 1.8m at 10°C is heated to proceed to produce a difference in length of 0.007m. Calculate the temperature to which it is heated. (Linear expansivity of aluminium = 2.3 x 10\(^{-5}\)K\(^{-1}\)

A mercury-in-glass thermometer reads 4cm at ice point and 29cm at steam point. Calculate the temperature when the mercury level is at 9cm

The continuous stirring in the method of mixtures to determine the specific thermal capacity of a substance ensures

Which of the following statements is correct about the effect of dissolved salt on the freezing point of water?

A pressurized perfume bottle is left on the window pane of a room. What happens to the gas molecules of the perfume on a sunny day? They

Given that v, f and \(\lambda\) are the velocity, frequency and wavelength of a wave respectively. Which of the following equations is correct?

The distance between two successive troughs of a wave is 0.4m. If the frequency of the source is 825Hz, Calculate the speed of the wave.

X-rays and infrared rays are both electromagnetic. Which common property do the waves have? Both waves

The image formed by a concave mirror is real, inverted and magnified, when object is placed

Total internal reflection

i. is a phenomenon of refraction of light.

ii. occurs when light rays travel into a denser medium.

iii. occurs when the critical angle is just exceeded.

iv. is a phenomenon of reflection of light.

Which of the statements above are correct?

Complementary colours are those which

The diagram given illustrates the waveform of a note produced by vibrations in an air column of length L. If the speed of sound in air is V, derive an expression for the frequency of the notes

The pair of musical instruments that works on the vibration of air in pipes is

An astronomical telescope has objectives and eye-piece lenses of focal length 3.5m and 5cm respectively. Determine the magnifying power of the telescope when in normal adjustment

An aluminum cable of diameter 4 x 10^-3m and resistivity 3.0 x 10^-8 Ωm has a resistance of 21Ω Calculate the length of the cable.

\(\scriptsize\pi = 3.14\)

The electricity meters in houses measure energy units consumed in

A man and his friend have masses 70kg and 60kg respectively. If they are seated 1.0m apart, calculate the gravitational force of attraction between them.

(G = 6.67 x 10^-11 Nm² kg^-2)

The p.d across a parallel-plate capacitor is 10³V. If the distance between the two plates is 10cm. Calculate the magnitude of the electric field strength between the plates.

Two different materials, rubbed against each other acquired opposite charges when separated. This is an example of charging by

Which of the following factors does not affect the e.m.f of a primary cell? Its

Two magnets are used to magnetize a soft iron bar PQ as illustrated in the diagram given. The correct polarity at P and Q respectively are

In strong magnets, keepers are used to

A 10\(\mu\)C charge moves with a velocity of 1.0 x 10⁵ ms^-1 at right angle to a uniform magnetic field of flux density 5.0 x 10^-4T. Calculate the force on the charge

Which of the following statements is not correct about steel and soft iron?

What determines the polarity at the ends of an electromagnet? The

How many beta particle(s) are emitted in the radioactive decay of  \(\scriptsize ^{198}_{79}Au \: \rightarrow \:  ^{198}_{80}Hg \)

The phenomenon by which two light atomic nuclei combine to form a heavy nuclide with the release of energy is known as

In a p-type semiconductor, the

Let \(\scriptsize \Delta x\) be the uncertainty in the measurements of position and \(\scriptsize \Delta p \)  the uncertainty in measurement of momentum. The uncertainty principle relation is given as

Which of the following graphs is correct for the decay of a radioactive substance with a half-life of 2 years?

The ammeter A2 shown in the circuit diagram above reads 3.0 A. Determine the reading of the ammeter A1.

Three letters are placed in front of a plane mirror as illustrated in the diagram above. The image formed is illustrated by

Four identical trolleys are loaded with different masses and move along a straight road at the same speed. Which of the trolleys has the greatest inertia?