Question 816:

• JAMB 1995

A rectangular metal block of volume 10^-6m³ at 273k is heated to 573k. If its coefficient of linear expansion is 1.2 x 10^-5k^-1, the percentage change of it volume is

A. 1.5%
B. 1.1%
C. 0.4%
D. 0.1%

Question 817:

• JAMB 1995

A piece of wood floats inside water at room temperature with a fraction of it above the liquid surface. As the temperature of the water is raised, the part of the wood above the liquid will

A. Decrease because the density of water decreases with temperature
B. Increase because the density of water decreases with temperature
C. Decreases because the density of water increases with water temperature
D. Increase because the density of water increases with temperature

Question 818:

• JAMB 1995

The equation P^xV^yT^z = constant in charles' law when

A. X = 1, y = -1, z = 1
B. X = 0, y = 1, z = -1
C. X = 1, y = 0, z = -1
D. X = 0, y = 1, z = 1

Question 819:

• JAMB 1995

An electric kettle with negligible heat capacity is rated at 2000W. If 2.0kg of water is put in it, how long will it take the temperature of water to rise from 20^OC to 100^OC? [specific heat capacity of water = 4200Jkg^-1k^-1]

A. 420S
B. 336S
C. 168S
D. 48S

Question 820:

• JAMB 1995

A temperature scale has a lower fixed point of 40mm and a upper fixed point of 200mm. What is the reading on this scale when a thermometer reads 60^oC?

A. 33.3mm
B. 36.0mm
C. 96.0mm
D. 136.0mm