JAMB UTME - Physics - 1978

Two lamps are rated 40W and 220V each are connected in series. The total power dissipated in both lamps is

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

The latent heat of fusion of ice is 80cal g^-1. How much heat is required to change 10g of ice at Q^oC into water at the same temperature?

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

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

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?

The internationally agreed system of units(SI) for physical measurements are

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

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

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

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

A temperature 20^oC is the same as

A gas at pressure PN-m^-2 and temperature 27^oC is heated to 77^oC at constant volume. The new pressure is

The factional force between two bodies

The following are some units i. Ns ii. Mm iii. Nm^-2 iv. J^oK^-1. What are the units of latent heat?

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

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

To determine the weight of an object you could

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?

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

In The Diagram, what is the value of W?

A string is sustaining a stationary wave when

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

A piece of rubber 10cm long stretches 6mm when a load of 100N is hung from it. What is the strain?

The angular dispersion of a prism depends on

An electric charge could be transmitted through

For the correction of myopic defects in the human eye we require

Two resistors R1 and R2 are connected in parallel, R2 being greater than R1. The combined resistance is

The visible part of light consists of the following colours

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

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

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?

The net charge on the atom is zero because

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)

Of the following which is different from the other?

An ice cube floats in a glass of water filled to the brim. What happens when the ice melts?

A man walks 1km due east and then 1km due north. His displacement is

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

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

The heat from the sun reaches the earth by the process

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?

The density of a solid is defined as the

The amount of heat required to raise the temperature of a body is

The force required to make an object of mass m, travelling with velocity v, turn in a circle of radius r is

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

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

The angular dispersion of a prism depends on

In order to convert a galvanometer into an ammeter

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

The equivalent capacitance for the circuit drawn above is