JAMB UTME - Physics - 1978
Question 1 Report
A machine gun with a mass of 5kg fires a 50g bullet at speed of 100ms-1. The recoil speed of the machine gun is
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Question 2 Report
A herdsman yelling out to fellow herdsman heard his voice reflected by cliff 4s later. What is the velocity of sound in air if the cliff is 680m away?
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Question 3 Report
Why is it impossible for the lines of force of an electric field to cross one another?
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Question 4 Report
Three 5 ohms resistors connected in parallel have a potential difference of 60v. applied across the combination. The current in each resistor is
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Question 5 Report
A piece of rubber 10cm long stretches 6mm when a load of 100N is hung from it. What is the strain?
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Question 6 Report
The latent heat of fusion of ice is 80cal g-1. How much heat is required to change 10g of ice at QoC into water at the same temperature?
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Question 7 Report
A palm fruit dropped to the ground from the top of a tree 45m tall. How long does it take to reach the ground? (g = 10ms-2)
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Question 9 Report
To determine the weight of an object you could
Question 11 Report
Two lamps are rated 40W and 220V each are connected in series. The total power dissipated in both lamps is
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Question 12 Report
If NEPA charges 5k per kWhr, what is the cost of operating for 24 hours a lamp required 1A on a 200v line?
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Question 14 Report
The force required to make an object of mass m, travelling with velocity v, turn in a circle of radius r is
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Question 16 Report
Every house supplied with electricity is provided with a box of fuses so that
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Question 19 Report
In a D.C. circuit, a 10 microfarad (mf) capacitor is placed in series with a 10 0hm resistor. The total resistance of the combination is
Question 20 Report
A potential difference of 6v is used to produce a current of 5A for 200s through a heating coil. The heat produced is
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Question 21 Report
The electric supply from Kainji Dam is transmitted at high voltages of the order hundreds of kilovolts but is converted to domestic use of about 220 volts by
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Question 22 Report
mercury is a better barometric fluid than water because i. it needs no colouring ii. its density is many times greater than that of water iii. it does not wet glass iv. it has a high vapour pressure v. it has a high boiling point. which of the above statements are true?
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Question 23 Report
An object is positioned between two plane mirrors inclined at right angles to each other. The object is 1 unit from each mirror. The number of images formed is
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Question 25 Report
A magnet is moved through a coil of wire. The e.m.f. produced in the wire depends on
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Question 26 Report
A gas at pressure PN-m-2 and temperature 27oC is heated to 77oC at constant volume. The new pressure is
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Question 29 Report
a guitar string is 75cm long. the wavelength of its fundamental note is
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Question 30 Report
The net charge on the atom is zero because
Question 31 Report
An object is positioned between two plane mirrors inclined at right angles to each other. The object is 1 unit distance from each mirror, the number of images formed is
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Question 32 Report
The internationally agreed system of units(SI) for physical measurements are
Question 33 Report
Which of the following is true for the image formed by a convex mirror? i. the image is always virtual ii. the image is always erect iii. the image lies between pole and focus iv. the image is never magnified v. the focus length is negative
Question 34 Report
A man walks 1km due east and then 1km due north. His displacement is
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Question 35 Report
For the correction of myopic defects in the human eye we require
Question 36 Report
The following are some units i. Ns ii. Mm iii. Nm-2 iv. JoK-1. What are the units of latent heat?
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Question 37 Report
The boys are communicating with each other by stretching a string passing through a hole punched in the bottom of each of two tin cans. The physical principle employed is that sound travels
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Question 38 Report
A few grains of table salt were put in a cup of water, kept at constant temperature and left undisturbed. Eventually all the water tasted salty. The action is due to
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Question 39 Report
An air force jet flying with a speed of 335ms-1 went past an anti-aircraft gun. How far is the aircraft 5s later when the gun was fired?
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Question 42 Report
An ice cube floats in a glass of water filled to the brim. What happens when the ice melts?
Question 43 Report
an object 1cm high placed on the axis 15cm from a converging lens forms an image 30cm from the lens. The size of the image is
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Question 46 Report
A solid suspended by a piece of string is completely immersed in water. On attempting to lift the solid out of the water, the string breaks when the solid is partly out of the water. This is because
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Question 48 Report
Two resistors R1 and R2 are connected in parallel, R2 being greater than R1. The combined resistance is
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Question 49 Report
The factional force between two bodies
Question 50 Report
The statements below were made by some students describing what happened during the determination of the melting point of solids.
i. the temperature of the solid was solid until melting started
ii. the temperature of the solid rose until melting started
iii. during melting, the temperature was rising
iv. during melting, the temperature was constant
v. the temperature continued to rise after all the solid had melted
vi. the temperature stopped rising after all the solid had melted. Which of the following gives correct statements in the right order?
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