1978 JAMB UTME Physics Past Questions

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1978

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?

1978

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

1978

In order to convert a galvanometer into an ammeter

1978

A magnet is moved through a coil of wire. The e.m.f. produced in the wire depends on

1978

If NEPA charges 5k per kWhr, what is the cost of operating for 24 hours a lamp required 1A on a 200v line?

1978

Three 5 ohms resistors connected in parallel have a potential difference of 60v. applied across the combination. The current in each resistor is

1978

Every house supplied with electricity is provided with a box of fuses so that

1978

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

1978

A potential difference of 6v is used to produce a current of 5A for 200s through a heating coil. The heat produced is

1978

Why is it impossible for the lines of force of an electric field to cross one another?

1978

On an a.c generator, which of the following does not apply?

1978

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

1978

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?

1978

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

1978

a guitar string is 75cm long. the wavelength of its fundamental note is

1978

An electric charge could be transmitted through

1978

The angular dispersion of a prism depends on

1978

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 focu…

1978

The angular dispersion of a prism depends on

1978

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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