Liquids At Rest - Jamb Physics Past Questions and Answers

Question 1:

• JAMB 1980

An object of mass m and volume v, is totally immersed in a liquid of density p. The tension of a string holding it is

A. Mg
B. (m + pv)g
C. (m - pv)g
D. Pvg
E. [M/m-pv]g

Question 2:

• JAMB 1981

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

A. 12
B. 3
C. 2
D. \(\frac{3}{2}\)
E. \(\frac{5}{4}\)

Question 3:

• JAMB 1982

Why does a piece of cork float on water?

A. There is no upthrust on it when completely immersed in water
B. The upthrust on it when completely immersed in water is greater than its weight in air
C. The upthrust on it when completely immersed in water is less than its weight in air
D. Its specific gravity is greater than that of water
E. Its specific gravity is the same as that of water

Question 4:

• JAMB 1983

If relative density of a metal is 19, what will be the mass of 20cm³ of the metal when immersed in water?

A. 380g
B. 400g
C. 360g
D. 39g
E. 180g

Question 5:

• JAMB 1983

A piece of wood is floating on water. The forces acting on the wood are

A. Upthrust and reaction
B. Weight and reaction
C. Weight and upthrust
D. Upthrust and viscousity
E. Weight and viscousity