JAMB UTME - Physics - 1981
Frage 1 Bericht
a balloon inflated with helium gas at ground level is released. As it rises through a constant temperature atmosphere.
Frage 4 Bericht
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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Frage 5 Bericht
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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Frage 6 Bericht
Heat may be transferred by conduction, convection and radiation. By which of these methods does heat travel through vacuum?
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Frage 8 Bericht
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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Frage 9 Bericht
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?
Frage 10 Bericht
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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Frage 12 Bericht
The principle of transmissibility of pressure in a fluid at rest in all directions is known as
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Frage 13 Bericht
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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Frage 15 Bericht
Which of the following is NOT directly associated with direct current (DC)?
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Frage 16 Bericht
Which of the following statements is CORRECT?
Frage 17 Bericht
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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Frage 18 Bericht
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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Frage 20 Bericht
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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Frage 22 Bericht
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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Frage 24 Bericht
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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Frage 25 Bericht
A liquid-in-glass thermometer should quickly register temperature changes. This is achieved by choosing a liquid that
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Frage 26 Bericht
Which of the following is NOT an effect that can be produced by an electric current?
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Frage 29 Bericht
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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Frage 30 Bericht
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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Frage 32 Bericht
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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Frage 34 Bericht
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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Frage 35 Bericht
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
Frage 38 Bericht
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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Frage 39 Bericht
An inclined plane of angle \(\theta\), acting as a simple machine, has a velocity ratio
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Frage 40 Bericht
If a source of sound is moving, a stationary listener will hear a sound of different frequency. This is called
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Frage 41 Bericht
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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Frage 42 Bericht
Which of the following does NOT describe the image formed by a plane mirror?
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Frage 43 Bericht
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?
Frage 44 Bericht
All of the following frequencies are overtones of 320 Hz EXCEPT
Frage 45 Bericht
When fixed mass of an ideal gas expands at constant temperature, which property of the gas molecule increases?
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Frage 46 Bericht
The effect of closing the key K in the circuit shown above would be to
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