JAMB UTME - Physics - 1981
Pregunta 1 Informe
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
Detalles de la respuesta
Pregunta 3 Informe
An aircraft travelled from calabar to kano as follows: it flew first to ilorin convering a distance of 300km, 30o west of North, and then flew 400km, 60o East of North to kano. What is the resultant displacement?
Detalles de la respuesta
Pregunta 4 Informe
A liquid-in-glass thermometer should quickly register temperature changes. This is achieved by choosing a liquid that
Detalles de la respuesta
Pregunta 5 Informe
Heat may be transferred by conduction, convection and radiation. By which of these methods does heat travel through vacuum?
Detalles de la respuesta
Pregunta 6 Informe
An inclined plane of angle \(\theta\), acting as a simple machine, has a velocity ratio
Detalles de la respuesta
Pregunta 7 Informe
The principle of transmissibility of pressure in a fluid at rest in all directions is known as
Detalles de la respuesta
Pregunta 10 Informe
The resistance of a 240V, 60 watt electric filament bulb is
Detalles de la respuesta
Pregunta 11 Informe
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?
Detalles de la respuesta
Pregunta 12 Informe
All of the following frequencies are overtones of 320 Hz EXCEPT
Detalles de la respuesta
Pregunta 13 Informe
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
Detalles de la respuesta
Pregunta 14 Informe
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
Detalles de la respuesta
Pregunta 16 Informe
a balloon inflated with helium gas at ground level is released. As it rises through a constant temperature atmosphere.
Detalles de la respuesta
Pregunta 18 Informe
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
Detalles de la respuesta
Pregunta 19 Informe
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?
Detalles de la respuesta
Pregunta 20 Informe
Which type of radiation does not NOT originate within the nucleus?
Detalles de la respuesta
Pregunta 22 Informe
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?
Detalles de la respuesta
Pregunta 23 Informe
Which of the following elements are real magnetic materials?
Detalles de la respuesta
Pregunta 24 Informe
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
Detalles de la respuesta
Pregunta 25 Informe
If a source of sound is moving, a stationary listener will hear a sound of different frequency. This is called
Detalles de la respuesta
Pregunta 28 Informe
The effect of closing the key K in the circuit shown above would be to
Detalles de la respuesta
Pregunta 30 Informe
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
Detalles de la respuesta
Pregunta 31 Informe
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
Detalles de la respuesta
Pregunta 32 Informe
Which of the following does NOT describe the image formed by a plane mirror?
Detalles de la respuesta
Pregunta 33 Informe
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
Detalles de la respuesta
Pregunta 34 Informe
Alternating current can induce voltage because it has a
Detalles de la respuesta
Pregunta 35 Informe
Heat was supplied to a block of ice at 0oC until half of it melted. Which of the following statements is true?
Detalles de la respuesta
Pregunta 36 Informe
When fixed mass of an ideal gas expands at constant temperature, which property of the gas molecule increases?
Detalles de la respuesta
Pregunta 37 Informe
The latent heat of fusion of a substance is the heat required to
Detalles de la respuesta
Pregunta 39 Informe
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
Detalles de la respuesta
Pregunta 40 Informe
Which of the following is NOT directly associated with direct current (DC)?
Detalles de la respuesta
Pregunta 41 Informe
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
Detalles de la respuesta
Pregunta 42 Informe
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
Detalles de la respuesta
Pregunta 43 Informe
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
Detalles de la respuesta
Pregunta 44 Informe
Which type of radiation does not NOT originate within the nucleus?
Detalles de la respuesta
Pregunta 45 Informe
Which of the following is NOT an effect that can be produced by an electric current?
Detalles de la respuesta
Pregunta 46 Informe
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?
Detalles de la respuesta
Pregunta 47 Informe
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?
Detalles de la respuesta
