JAMB Physics 2000 past questions

I. The frictional force is independent of the area of the surfaces in contact, II The frictional force depends on the nature of the surfaces in contact III The frictional force depends on the speed sliding IV The frictional force is directly proportional to the normal reaction Which combination of the above is true of sliding friction?

When a ship sails from salt water into fresh water, the friction of its volume above the water surface will

At a fixed point below a liquid surface, the pressure downward is P1 and the pressure upward is P2. It can be deduced that

I. Its velocity is constant II No work is done on the body III It has constant acceleration away from the center IV The centripetal force is directed towards the center. Which combination of the above is true of a body moving with constant speed in a circular track?

The velocity v of a particle in a time t is given by the equation v = 10+2t2. Find the instantaneous acceleration after 5 seconds.

If the force and the velocity on a system are each reduced simultaneously by half, the power of the system is

The velocity ratio of a machine is 5 its efficiency is 75%. What effort would be needed to lift a load of 150N with the machine?

I. Coherence II Same frequency III Same wavelength IV Same intensity. Which of the conditions above are necessary to produce interference fringes?

Days 1 Day 2 Day 3 Dry 300C 290C 250C Wet 220C 220C 210C The readings above are for three consecutive days from a wet and dry bulb hygrometer. It can be concluded that the relative humidity for the three days

One end of a long wire is fixed while vibrator is attached to the other end. When the vibrator is energized, the types of waves generated in the wire are

The diagram above shows a maximum and minimum thermometer divided into three portions P, Q and R. Which of the following is true about the respective contents of P, Q and R?

The main reason for making the cover of a vacuum flask airtight is to prevent heat loss by

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

In the diagram above, a beam of white light travels from a rare to dense medium. What colours of light do the rays a, b, c respectively represent.

The diagram above shows two capacitors P and Q of capacitances 5uF and 10 uF. Find the charges stores in P and Q respectively.

What optical instrument can best be constructed with converging lenses of focal lengths 500cm and 5cm?

In the diagram above, the values of V1 and V2 are respectively

A 2H inductor has negligible resistance and is connected to a 50/ Hz a.c. supply. The reactance of the inductor is

If the fraction of the atoms of a radioactive material left after 120 years is 1/64 What is the half-life of the material?

In a pure semicondctor, the number of electron in the conduction band is

Light energy 5eV falls on a metal of work function 3 ev and electrons are liberated. The stopping potential is

In the thermonuclear reaction, the total initial mass is 5.02 x 10-27kg. The energy released in the process is

The magnetic flux in a coil having 200 turns changes at the time rate of 0.08 Ws-1. The induced e.m.f. in the coil is

If the frequency of an emitted x-rays is 1.6 x 1016 Hz, the accelerating potential is

The correct position for a fuse in the diagram above is

In the a.c. circuit above, the current value is

If current flows in the direction of the arrows in the solenoid above, the North pole is at

An electric generator with a power output of 3.0kW at a voltage of 1.5kV distributes power along cables of total resistance 20.0 ohms. the power loss in the cable is