2025 JAMB Physics Past Questions CBT

From the diagram above, a weight W = 60 N is suspended horizontally by a string attached to a wall. Find the tension T on the string?

Evaluate the frequency of the third harmonics of a closed pipe of length 0.3 m.

[speed of sound in air = 340 m s^-1]

An electrical appliance is rated 240 V and 45 W. Calculate the current drawn from the appliance.

I. Engine oil
II. Water
III. Glycerin

In which of the following fluids will a ball experience the greatest speed?

In extrinsic semiconductors, dopants are:

I. Gas supply to all terminal stations
II. Water level in dams
III. Vandalization of electric cables.

Which of these can affect electricity supply in Nigerian homes and industries?

Which of the following is true about a machine?

In changing a d.c. motor to a.c. motor, what adjustment will be done?

The dielectric of a capacitor is used to:

The speed of sound in air is independent of:

The dimensions of power are:

A man moves 20 m North, then 12 m East and finally 15 m South. His displacement from the starting point is now:

In the a.c. circuit above, what is the capacitive reactance?

The angle between the geographic north and the magnetic north is angle of:

In photoelectric effect, the kinetic energy of photo electrons depends on:

An object moves in a circular path of radius 0.5 m with a speed of 1 m s^-1. What is its angular velocity?

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

A man walks 1 km due east and then 1 km due north. His displacement is:

The density of 400 cm³ of palm oil was 0.9 g cm^-3 before frying. If the density of the oil was 0.6 g cm⁻³ after frying, assuming no loss of oil due to spilling, its new volume was:

Which of the following is true of an electrical charge?

Natural radioactivity consists of the emission of:

Which of the following does not describe the image formed by a plane mirror?

Which of the following best describes the energy changes which take place when a steam engine drives a generator which lights a lamp?

Cathode rays are:

A narrow beam of white light can be split up into different colours by a glass prism. The correct explanation is that:

The ray which causes gas molecules to glow is known as:

Which of the following materials is a conductor?

A silicon material is doped with an element of a certain group and an n-type semiconductor is formed. The most likely group of the element is:

When impurities are added to semiconductors, the conductivity of the semiconductor:

The current in a reverse-biased junction is due to:

The stylus of a phonograph record exerts a force of 7.7 × 10^-2 N on a groove of radius 10^-5 m. Compute the pressure exerted by the stylus on the groove.

A piece of stone attached to one end of a string is whirled round in a horizontal circle and the string suddenly cuts. The stone will fly off in a direction:

The phenomenon whereby the water droplets in the atmosphere combine with dust particles in the air to reduce visibility

A quantity of water at 0 °C is heated to about 30 °C. At each degree rise in temperature its density will:

A thin wire with heavy weights attached to both ends is hung over a block of ice resting on two supports. If the wire cuts through the ice block while the block remains solid behind the wire, the process is called:

A cell of internal resistance 0.01 Ω can be measured accurately using the:

An electron of charge 1.6 × 10^-19 C  and mass 9.1 × 10^-31 kg is accelerated between two metal plates with a velocity of 4 × 10⁷ ms^-1, the potential difference between the plates is:

A 90 cm uniform lever has a load of 30 N suspended at 15 cm from one of its end. If the fulcrum is at the centre of gravity, the force that must be applied at its other end to keep it in horizontal equilibrium is:

On top of a spiral spring of force constant 500 Nm^-1 is placed a mass of 5 × 10^-3 kg. If the spring is compressed downwards by a length of 0.02 m and then released, calculate the height to which the mass is projected.

[g = 10 ms^-2]

A hose of cross-sectional area 0.5 m² is used to discharge water from a water tanker at a velocity of 60 ms^-1 in 20 s into a container. If the container is filled completely, the volume of the container is: