JAMB Physics 2004 Past Questions

A generator manufacturing company was contracted to produce an a.c dynamo but inadvertently produced a d.c dynamo. To correct this error, the

A radioisotope has a decay constant of 10^-7s^-1. The average life of the radioisotope is

An a.c circuit of e.m.f 12V has a resistor of resistance 8Ω connected in series to an inductor of inductive reactance 16Ω and a capacitor capacitive reactance 10Ω. The current flow in the circuit is

For semi conductor to have negative temperature coefficient of resistance implies that

X rays can be used in the study of crystal structure because they

A moving coil galvanometer has a full-scale deflection of 3A equivalent to 30^o deflection. The sensitivity of the instrument is

The particle and wave nature of matter are demonstrated in the equation

In a reverse biased junction diode, current flows in by

In a tuned radio receiver R, L, C series circuit for resonance, the inductive and capacitive reactance X_L and X_C respectively are related as

The binding energy of helium	4	He is
	2

[atomic mass of proton = 1.00783U,
atomic mass of neutron = 1.00867U]

Flourescent tubes produces light by the

The energy stored in an inductor of inductance 5mH when a current of 6A flows through it is

A steady current of 2A flows in a coil of emf 12V for 0.4s. A back emf of 3V was induced during this period. The stored energy in the loop that can be utilized is

The instrument used for securing a large number of similar charges by induction is called

If 16mA of current flows through a conductor in one second, the number of electron transported per seconds is
[1 electronic charge = 1.6 x 10^-19C]

Electrical appliances at home are normally earthed so that

Given three capacitors 0.3μF, 0.5μF and 0.2μF, the joint capacitance when arranged to give minimum capacitance is

The difference between X-rays and gamma rays is that

To protect a material from the influnce of an external magnetic field, the materials should be kept

In the diagram above, the ratio of he electric power dissipated in the 6Ω and the 3Ω resistor respectively is

If the angle between two vector P and Q is O^o, the vectors are said to

A body of mass 4kg is acted on by a constant force of 12N for 3 seconds. The kinetic energy gained by the body at the end of the time is

A machine whose efficiency is 60% has a velocity ratio of 5. If a force of 500N is applied to lift a load P, what is the magnitude of P?

I. Jet propelled aircraft
II. Rocket propulsion
III. The recoil of a gun
IV. A person walking
Which of the above is based on Newton's third law of motion

In a hydraulic press , a force of 40N is applied on the effort piston of area 0.4m². If the force exerted on the load piston is 400N, the area of the large piston is

A 100kg box is pushed along a road with force of 500N. If the box moves with a uniform velocity, the coefficient of friction between the box and the road is

As the pressure of a fluid increases, its viscosity

the diagram above shows forces 4N, 6N, 10N and 8N which act at a point O in the directions indicated. the net horizontal force is

The earth is four times the size of the moon and the acceleration due to gravity on the earth is 80 times that on the moon. The ratio of the mass of the moon to that of the earth is

In which of the following material media will sound travel fastest?

What types of mirror are capable of producing parallel beams of light such as those arising from the headlamps of a car?

What happens to the rays in a parallel beam of light?

A ray of light makes an angle of 35^o with a plane mirror. What is the angle of reflection?

A person can focus an object only when it lies within 200cm from him. Which spectacles should be used to increase his maximum distance of distinct vision infinity

The pitch of a sound note depends on

If u is the object distance and v the image distance, which of the following expressions gives the linear magnification produced by a convex lens of focal length f?

The refractive index of the medium M in the diagram above is

When left in a freezer, a bottle full of water cracks on freezing into ice because of the

The phase difference between waves P and q in the diagram above is

The change in volume when 450kg of ice is completely melted is
[density of ice = 900 kgm^-3, density of water = 100 kgm^-3]

Tea pots are often silver-coated to prevent heat loss by

I. Wavelength
II. Medium of propagation
III. Wave velocity
IV. Frequency
V. Energy
Which of the above are used for characterizing waves?

A 50W electric heater is used to heat a metal block of mass 5kg. If in 10 minutes a temperature rise of 12^oC is achieved, the specific heat capacity of the metal is

Metal rods of length 20m each are laid end to end to form a bridge at 25^oC. What gap will be provided between consecutive rails for the bridge to withstand 75^oC?
[Linear expansivity of the material = 2.0 x 10^-5K^-1

Transverse waves can be distinguished from longitudinal waves using the characteristic of

A man exerts a pressure of 2.8 x 10³Nm^-2 on the ground and has 4 x 10^-2m² of his feet in contact with the ground. The weight of the man is

Calculate the angle of minimum deviation for a ray which is refracted through an equiangular prism of refractive index 1.4

A cell whose internal resistance is 0.5Ω delivers a current of 4A to an external resistor,The loss voltage of the cell is

If a force of 50N stretches a wire from 20m to 20.01m, what is the amount of force required to stretch the same material from 20m to 20.05m?