Question 861:

• 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

Question 862:

• JAMB 1997

A piece of wire gauze can be made to lie on water because

A. The wire guaze is less dense than water
B. The water molecules repels the wire guaze upwards
C. The water surface has the effect of an elastic thin skin
D. Of the cohensive forces between the water and the wire guaze molecules

Question 863:

• JAMB 1997

A liquid of mass 1.0 x 10³kg fills a rectangular tank of length 2.5m and width 2.0m. If the tank is 4m high, what is the pressure at the middle of the tank?[g = 10ms^-2]

A. 1.0 x 10⁴Nm^-2
B. 2.0 x 10³Nm^-2
C. 1.5 x 10³Nm^-2
D. 1.0 x 10³Nm^-2

Question 864:

• JAMB 1997

An empty 60 litre petrol tank has a mass of 10kg. Its mass when full of fuel of relative density 0.72 is

A. 7.2kg
B. 33.2kg
C. 43.2kg
D. 53.2kg

Question 865:

• JAMB 1997

The length of mercury thread when it is at 0°C, 100°C and at an unknown temperature \(\theta\) is 25mm, 225mm and 175mm respectively. The value of \(\theta\) is

A. 85.0^oC
B. 80.0^oC
C. 75.0^oC
D. 70.0^oC