JAMB Physics 2003 past questions

What does not drop through an open umbrella of silk material unless the inside of the umbrella is touched

The stylus of a phonograph record exerts a force of 77. x 10-2 N on a groove of radius 10-5 m. Compute the pressure exerted by the stylus on the groove.

The length of a piece of glass block was measured of a vernier caliper as shown above. The length of the glass block is

A 90cm uniform lever has a load of 30N suspended at 15cm from one of its ends. 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 x 10-3kg. If the spring is compressed downwards by a length of 0.02m and then released, calculate the height to which the mass is projected

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

Given that Young’s modulus for aluminium is 7.0 x 1010Nm-2 and density is 2.7 x 103kgm-3. Find the speed of the sound produced if a solid bar is struck at one end with a hammer?

Thermal equilibrium between two objects exists when

If the distance from a point source of sound is doubled, by what factor does the density decrease?

If an object is placed between two parallel plane mirrors with their reflecting surfaces facing each other, how many images of the object will be formed?

A 2 000W electric heater is used to heat a metal object of mass 5kg initially at 100C. If a temperature rise of 300C is obtained after 10 min, the heat capacity of the material is

By what factor will the size of an object placed 10cm from a convex lens be increased if the image is seen on a screen placed 25cm from the lens?

On a fairly cool rainy day when the temperature is 200C, the length of a steel railroad track is 20m. What will be its length on a hot dry day when the temperature is 400C?

If 1.2 x 106J of heat energy is given off in 1 sec. From a vessel maintained at a temperature gradient of 30km-1, the surface area of the vessel is

T0C 20 40 60 S.V.P(mmHg) 4.58 6.51 8.94 12.67 17.50 55.10 149.00 The table above shows the saturation vaour pressure against temperature in a certain town. If the vapour pressure in this town at 200C is 10mmHg, what is the relative humidity?

At what position will an object be placed in front of a concave mirror in order to obtain an image at infinity?

An open pipe closed at one end produces its first fundamental note. If the velocity of sound in air is v and l the length of the pipe, the frequency of the note is

In the diagram above, if each of the resistors can dissipate a maximum of 18W without becoming excessively heated, what is the maximum power the circuit can dissipate?

I. It retains its magnetism much longer than steel II it is more easily magnetized tah steel III It is more easily demagnetized than steel IV It produces a stronger magnet than steel. Which combination of the above makes iron preferable to steel in the making of electromagnets?

Which of the following pairs of light rays shows the widest separation in the spectrum of white light?

In the diagram above, what would happen to the current, I, if another resistor, R2, is connected in parallel to R1?

The most suitable cell used for short interval switches in electric bells is a

An electron of charge 1.6 x 10-19C is accelerated between two metal plates. If the kinetic energy of the electron is 4.8 x 10-17J, the potential difference between the plates is

The operation of an optical fibre is based on the principal of

In a semiconductor junction diode, as the depletion or barrier layer is forward-based, the layer

When a nucleus is formed by bringing protons and neutrons together, the actual mass of the formed nucleus is less than the sum of the masses of the constituent protons and neutrons. The energy equivalent of this mass difference is the

An electron makes a transition from a certain energy level Ek to the ground sate E0. If the frequency of emission is 8.0 x 1014Hz, the energy emitted is

In a fission process, the decrease in mass is 0.01%. How much energy could be obtained from the fission of 1.0g of the materials?

When an alternating current given by 1 = 10sin (120w) passes through a 12 ohms resistor, the power dissipated in the resistor is

The major difference between a pure semiconductor and a pure metal is that

If the uncertainty in the measurement of the position of a particle is 5 x 10-10m, the uncertainty in the momentum of the particle is

In the calibration of an ammeter using Faraday’s laws of electrolysis, the ammeter reading is kept constant at 1.20A. If 0.990g of copper is deposited in 40 minutes, the correction to be applied to the ammeter is

The maximum kinetic energy of the photoelectrons emitted from a metal surface is 0.34cV. If the work function of the metal surface is 1.83cV, find the stopping potential

The force on a charge moving with velocity v in a magnetic field B is half of the maximum force when the angle between v and B is

The count rate of a radioactive material is 800 count/min. If the half-life of the material is 4 days, what would the count rate be 16 days later?