2013 JAMB Physics Past Questions

When a brick is taken from the earth’s surface to the moon, its mass

The resultant of two forces is 50 N. If the forces are perpendicular to each other and one of them makes an angle of 30° with the resultant, find its magnitude.

The pair of physical quantities that are scalar only are

A simple pendulum of length of 0.4 m has a period of 2 s. What is the period of a similar pendulum of length 0.8 m at the same place?

A train with an initial velocity of 20 ms^-1 is subjected to a uniform deceleration of 2 ms^-2. The time required to bring the train to a complete halt is _____.

Calculate the apparent weight loss of a man weighing 70 kg in an elevator moving downwards with an acceleration of 1.5 ms^-2.

[g = 10 ms^-2]

A piece of cork floats in a liquid. What fraction of its volume will be immersed in the liquid?

[Density of the cork = 0.25 × 10³ kgm^-3, Density of the liquid = 1.25 × 10³ kgm^-3]

An object is moving with a velocity of 5 ms^-1. At what height must a similar body be situated to have a potential energy equal in value with kinetic energy of the moving body?

If a pump is capable of lifting 5000 kg of water through a vertical height of 60 m in 15 min. The power of the pump is  ___?

The coefficient of friction between smooth surfaces is

What effort will a machine of efficiency 90% apply to lift a load of 180 N, if its efforts arm is twice as long as its load arm?

Calculate the work done when a force of 20 N stretches a spring by 50 mm?

At what depth below the sea level would one experience a change in pressure equal to one atmosphere?

[density of sea water 1013 kgm^-3, one atmosphere = 1.01 × 10⁵ N m⁻², g = 10 ms^-2]

What volume of alcohol will have same mass as 4.2 m³ of petrol?

[Density of alcohol = 8.4 × 10² kgm^-3, density of petrol = 7.2 × 10² kgm^-3]

Calculate the length which corresponds to a temperature of 20°C if the ice and steam points an ungraduated thermometer are 400 mm apart.

A wire of length 100.0 m at 30°C has linear expansivity of 2 × 10^-5 K^-1. Calculate the length of the wire at a temperature of -10°C.

A gas at a pressure of 10⁵ Nm^-2 expands from 0.6 m³ to 1.2 m³ at constant temperature, the work done is

Two liquids, X and Y, having the same mass, are supplied with the same quantity of heat. If the temperature rise in X is twice that of Y, the ratio of specific heat capacity of X to that of Y is

Foods cook quicker in salt water than in pure water because of the effect of

Steam from boiling water causes more damage on the skin than does boiling water because

What will happen to the boiling point of pure water when it is heated in a place 30m below sea level?

The rise or fall of a liquid in a narrow tube is because of the

The mechanism of heat transfer from one point to another through the vibration of the molecules of the medium is

A wave that travels through stretched strings is known as

A transverse wave and a longitudinal wave travelling in the same direction in a medium differ essentially in their

What is the velocity of sound at 100°C if the velocity of sound at 0°C is 340 ms^-1?

If a sonometer has a fundamental frequency of 450 Hz, what is the frequency of the fifth overtone?

A man 1.5 m tall is standing 3m in front of a pinhole camera whose distance between the hole and tile screen is 0.1 m. What is the height of the image of tile man on the screen?

A ray of light passing through the centre of curvature of a concave mirror is reflected by the mirror at

From the diagram above, calculate the incident angle

Total internal reflection will not occur when light travels from

What does the diagram above represent?

If the linear magnification of the objective and eyepiece convex lenses of a compound microscope are 4 and 7 respectively, calculate the angular magnification of the microscope.

The angle of deviation of light of various colours passing through a triangular prism increases in the order

Calculate the force acting on an electron of charge 1.5 × 10^-19 C placed in an electric field of intensity 10⁵ Vm^-1.

Capacitors are used in the induction coil to

A cell of emf 1.5 V is connected in series with a 1 Ω resistor and a current of 0.3 A flows through the resistor. Find the internal resistance of the cell.

Which of the following obeys ohms laws?

A house has ten 40 W and five 100 W bulbs. How much will it cost the owner of the house to keep them lit for 10 hours if the cost of a unit is ₦5?

An electric device is rated 2000 W, 250 V. Calculate the maximum current it can take.

When a charge moves through an electric circuit in the direction of an electric force, it

To convert a galvanometer to a voltmeter, a

Induced emfs are best explained using _______?

If a current of 2.5 A flows through an electrolyte for 3 hours and 1.8 g of a substance is deposited, what is the mass of the substance that will be deposited if a current of 4 A flows through it for 4.8 hours?

Calculate the energy of the third level of an atom if the ground state energy is -24.8 eV

In photo-emission, the number of photo-electrons ejected per second depends on the

The particle nature of light is demonstrated by the

The energy of a photon having a wavelength of 10^-10 m is

(h = 6.63 × 10 ^-34 Js, c = 3.0 × 10 ⁸ ms^-1)

The bond between silicon and germanium is ______.