JAMB UTME - Physics - 1981
Pregunta 1 Informe
The resistance of a 240V, 60 watt electric filament bulb is
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Pregunta 2 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
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Pregunta 3 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
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Pregunta 4 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
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Pregunta 5 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?
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Pregunta 8 Informe
All of the following frequencies are overtones of 320 Hz EXCEPT
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Pregunta 9 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
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Pregunta 10 Informe
Which of the following does NOT describe the image formed by a plane mirror?
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Pregunta 12 Informe
The principle of transmissibility of pressure in a fluid at rest in all directions is known as
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Pregunta 13 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?
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Pregunta 15 Informe
The latent heat of fusion of a substance is the heat required to
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Pregunta 17 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
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Pregunta 18 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?
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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?
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Pregunta 20 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
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Pregunta 22 Informe
When fixed mass of an ideal gas expands at constant temperature, which property of the gas molecule increases?
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Pregunta 23 Informe
Which of the following is NOT an effect that can be produced by an electric current?
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Pregunta 24 Informe
Which type of radiation does not NOT originate within the nucleus?
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Pregunta 25 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
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Pregunta 26 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
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Pregunta 27 Informe
The effect of closing the key K in the circuit shown above would be to
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Pregunta 29 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
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Pregunta 30 Informe
If a source of sound is moving, a stationary listener will hear a sound of different frequency. This is called
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Pregunta 31 Informe
Which of the following is NOT directly associated with direct current (DC)?
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Pregunta 32 Informe
Alternating current can induce voltage because it has a
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Pregunta 33 Informe
a balloon inflated with helium gas at ground level is released. As it rises through a constant temperature atmosphere.
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Pregunta 34 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
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Pregunta 35 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
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Pregunta 36 Informe
Heat may be transferred by conduction, convection and radiation. By which of these methods does heat travel through vacuum?
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Pregunta 37 Informe
Which of the following elements are real magnetic materials?
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Pregunta 39 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?
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Pregunta 40 Informe
A liquid-in-glass thermometer should quickly register temperature changes. This is achieved by choosing a liquid that
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Pregunta 42 Informe
Heat was supplied to a block of ice at 0oC until half of it melted. Which of the following statements is true?
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Pregunta 43 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
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Pregunta 45 Informe
Which type of radiation does not NOT originate within the nucleus?
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Pregunta 46 Informe
An inclined plane of angle \(\theta\), acting as a simple machine, has a velocity ratio
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Pregunta 47 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?
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