JAMB UTME - Physics - 1981
Vraag 1 Verslag
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?
Antwoorddetails
Vraag 2 Verslag
Which of the following does NOT describe the image formed by a plane mirror?
Antwoorddetails
Vraag 3 Verslag
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
Antwoorddetails
Vraag 5 Verslag
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?
Vraag 7 Verslag
Which of the following is NOT directly associated with direct current (DC)?
Antwoorddetails
Vraag 8 Verslag
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?
Antwoorddetails
Vraag 9 Verslag
An inclined plane of angle \(\theta\), acting as a simple machine, has a velocity ratio
Antwoorddetails
Vraag 12 Verslag
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?
Antwoorddetails
Vraag 13 Verslag
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
Antwoorddetails
Vraag 15 Verslag
Which of the following statements is CORRECT?
Vraag 16 Verslag
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
Antwoorddetails
Vraag 18 Verslag
The effect of closing the key K in the circuit shown above would be to
Antwoorddetails
Vraag 20 Verslag
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
Antwoorddetails
Vraag 21 Verslag
All of the following frequencies are overtones of 320 Hz EXCEPT
Vraag 22 Verslag
The principle of transmissibility of pressure in a fluid at rest in all directions is known as
Antwoorddetails
Vraag 23 Verslag
a balloon inflated with helium gas at ground level is released. As it rises through a constant temperature atmosphere.
Vraag 25 Verslag
If a source of sound is moving, a stationary listener will hear a sound of different frequency. This is called
Antwoorddetails
Vraag 26 Verslag
When fixed mass of an ideal gas expands at constant temperature, which property of the gas molecule increases?
Antwoorddetails
Vraag 28 Verslag
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
Vraag 29 Verslag
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
Antwoorddetails
Vraag 31 Verslag
A liquid-in-glass thermometer should quickly register temperature changes. This is achieved by choosing a liquid that
Antwoorddetails
Vraag 32 Verslag
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
Antwoorddetails
Vraag 33 Verslag
Which of the following is NOT an effect that can be produced by an electric current?
Antwoorddetails
Vraag 34 Verslag
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
Antwoorddetails
Vraag 36 Verslag
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
Antwoorddetails
Vraag 37 Verslag
Heat may be transferred by conduction, convection and radiation. By which of these methods does heat travel through vacuum?
Antwoorddetails
Vraag 38 Verslag
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
Antwoorddetails
Vraag 40 Verslag
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
Antwoorddetails
Vraag 43 Verslag
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?
Antwoorddetails
Vraag 44 Verslag
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?
Antwoorddetails
Vraag 45 Verslag
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
Antwoorddetails
Vraag 46 Verslag
Heat was supplied to a block of ice at 0oC until half of it melted. Which of the following statements is true?
Antwoorddetails
