Jamb Physics 1978 Past Questions and Answers

Question 11:

• JAMB 1978

To determine the weight of an object you could

A. Use a beam balance
B. Use a spring balance
C. Find the force necessary
D. Use none of these methods
E. Use any of these methods

Question 12:

• JAMB 1978

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

A. \(\frac{mv^2}{r}\)
B. \(\frac{mr^2}{v}\)
C. \(\frac{mr}{v}\)
D. \(\frac{mv}{r^2}\)
E. \(\frac{mv}{r}\)

Question 13:

• JAMB 1978

The density of a solid is defined as the

A. Mass of the solid compared to the mass of an equal volume of water
B. Amount of water displaced when a unit mass of thesolid is immersed in it
C. Weight per unit volume of the solid
D. Volume per unit mass of the solid
E. Mass per unit volume of the solid

Question 14:

• JAMB 1978

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

A. The tension in the string decreases as the solid is lifted
B. The mass of the solid has increased
C. The solid apparently weighs less when completely immersed in water than when partially immersed
D. Part of the solid still in water is exerting more force on the string
E. The solid is no longer in equilibrium with water

Question 15:

• JAMB 1978

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?

A. Ii, iv, and v
B. Ii, iii and vi
C. I, iii and vi
D. I, iii and v
E. I, iv and v