Upthrust on a body immersed in a liquid - Jamb Physics Past Questions and Answers

Question 1:

• JAMB 2019

If the time of flight is 96seconds, calculate the horizontal range through the point of projection.

A. 84400m
B. 69000m
C. 61440m
D. 24000m

Question 2:

• JAMB 1986

A heavy object is suspended from a string and lowered into water so that it is completely submerged. The object appears lighter because

A. The density of water is less than that of the object
B. The pressure is low just below the water surface
C. It experiences an upthrust
D. The tension in the string neutralizes part of the weight

Question 3:

• JAMB 1988

A body whose mass is 2kg and has a volume of 500cm3 just floats when completely immersed in a liquid. Calculate the density of the liquid

A. 4.0 x 10²kgm^-3
B. 4.0 x 10³kgm^-3
C. 1.0 x 10³kgm^-3
D. 1.0 x 10⁶kgm^-3

Question 4:

• JAMB 1992

If a plastic sphere floats in water (density = 1000kgm³) with 0.5 of its volume submerged, and floats in oil with 0.4 of its volume submerged the density of the oil is

A. 800kgm³
B. 1200kgm³
C. 1250kgm³
D. 2000kgm³

Question 5:

• JAMB 1997

A cube of sides 0.1m hangs freely from a string. What is the upthrust on the cube when totally immersed in water? [density of water is 1000kgm^-2, g = 10ms^-2]

A. 1000 N
B. 700 N
C. 110 N
D. 10 N