JAMB Physics 1981 Past Questions

The ice and steam points of mercury-in-glass thermometer of centigrade scale and of uniform bore correspond respectively to 3cm and 19cm lengths of the mercury thread when the length is 12cm, the temperature is

A vapour is said to be saturated when

The latent heat of fusion of a substance is the heat required to

The following types of waves are transverse EXCEPT

The principle of transmissibility of pressure in a fluid at rest in all directions is known as

When fixed mass of an ideal gas expands at constant temperature, which property of the gas molecule increases?

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

If a source of sound is moving, a stationary listener will hear a sound of different frequency. This is called

Which of the following elements are real magnetic materials?

An inclined plane of angle \(\theta\), acting as a simple machine, has a velocity ratio

Heat may be transferred by conduction, convection and radiation. By which of these methods does heat travel through vacuum?

Which of the following statements is applicable to a real image formed by a concave mirror? i. it can be observed on a screen ii. it is always inverted and in front of the mirror iii. it only seams to exist IV. it is formed by the actual converging of rays of light

Which of the following is NOT an effect that can be produced by an electric current?

A cell of e.m.f 2V and internal resistance 1\(\Omega\) supplies a current of 0.5 amps to a resistance whose value is

An example of a scalar quantity is

Heat was supplied to a block of ice at 0^oC until half of it melted. Which of the following statements is true?

When a ray of light passes from water to glass, it is

The resistance of a 240V, 60 watt electric filament bulb is

An aircraft travelled from calabar to kano as follows: it flew first to ilorin convering a distance of 300km, 30^o west of North, and then flew 400km, 60^o East of North to kano. What is the resultant displacement?

All of the following frequencies are overtones of 320 Hz EXCEPT

The driver in a motor car, of which the total mass is 800kg and which is traveling at 20ms^-1, suddenly observes a stationary dog in his path 50m ahead. If the car brakes can exert a force of 2000N, what will most likely happen?

The absolute refractive indices of glass and water are \(\frac{3}{2}\) and \(\frac{4}{3}\) respectively. The refractive index at the interface when a ray travels from water to glass is

Which of the following statements is CORRECT?

Which type of radiation does not NOT originate within the nucleus?

Which type of radiation does not NOT originate within the nucleus?

The resistance of an open series circuit is

The lack of power of accommodation which is mainly due to the hardening of the eye lens and is usual with onset of old age is called?

A body falls freely under gravity (g = 9.8ms^-2) from a height of 40m on to the top of a platform 0.8m above the ground. Its velocity on reaching the platform is

Two particles X and Y starting from rest cover the same distance. The acceleration of X is twice that of Y. the ratio of the time taken by X to that taken by Y is

a balloon inflated with helium gas at ground level is released. As it rises through a constant temperature atmosphere.

Change of state is accompanied by change of

The quantity (timbre) of sound depends on

The mass of a proton is approximately equal to that of

An object placed on the principle axis of a convex lens of focal length 10m produces a real image of double magnification. The image distance from the lens is

A liquid-in-glass thermometer should quickly register temperature changes. This is achieved by choosing a liquid that

The extension in a spring when 5g wt was hung from it was 0.56cm. If Hooke's law is obeyed, What is the extension caused by a load of 20g wt?

Which of the following is NOT directly associated with direct current (DC)?

The relationship between the period T and the length T of a smile pendulum is T = 2\( \pi \) \( ( \frac{I}{g}) ^{ \frac{1}{2} } \). From experiment data of T and I, one can obtain the following graphs, i. T vs.I ii. T vs I² iii. T² vs. I iv. T vs \( \sqrt{I} \) v. logT vs logI. Which of the following graphs, are linear?

A transformer has 300 turns of wire in the primary coil and 30 turns in the secondary coil.If the input voltage is 100 volts, the output voltage is

A closed coil of wire is placed near a magnet. The magnet lies along the axis of the coil. Under which of the following conditions would there be no current in the coil?

If I is the current passing through a metallic resistor and H is the rate of Heat generated in the resistor at a constant temperature, then

A solid weighs 4.8g in air, 2.8g in water and 3.2g in kerosine. The ratio of density of the solid to that of the kerosine is

A body of mass 6kg rests on an inclined plane. The normal reaction is R and the limiting frictional force is F as shown in the image above. if F = 30N, and g = 10ms² then the angle of inclination \( \theta \) is

The effect of closing the key K in the circuit shown above would be to

The wave motion above has a frequency

in a light experiment with a convex lens a student plotted a graph as shown above of the reciprocal of object distance (1)/u against the reciprocal of image distance (1)/v . the focal length of the lens is given as