HEAT

A blister on the skin caused by steam is more painful than blister caused by boiling water because 

• steam has a higher temperature
• steam has high specific latent heat of vaporisation
• steam takes longer time to lose heat
• steam has high specific heat capacity

Calculate the amount of heat required to convert 1g of water at 30^oC to steam at 100^oC.

[Specific heat capacity of water = 4200 Jkg^-1oC^-1
Specific latent heat of vaporization of water = 2.26 X 10⁶ J kg^-1] 

• 294 J 
• 1441 J
• 2260 J
• 2554 J

Two objects A and B are in contact as shown below. 
When thermal equilibrium is reached, 

• the specific heat capacity of A and B are equal 
• the latent heat of A and B are equal 
• the temperatures of A and B are equal 

Which graph does not illustrate Boyle’s Law ? 

• A
• B
• C
• D

Which of the following is the fixed variable in a Charles’ Law experiment? 

• Temperature 
• Volume 
• Pressure 

Diagram shows a  gas molecules inside a cylinder. The piston is moved slowly downwards and the temperature of the gas stays the same.
Why does the pressure of the gas increase?

• The molecules collide harder with the walls
• The molecules collide more often with the walls
• The molecules move more quickly 
• The number of molecules increases 

Why the bubbles become larger as the bubbles rise to the surface of water ?.

• Atmospheric pressure on the bubbles decreases
• Atmospheric pressure on the bubbles increases
• Water pressure on the bubbles decreases
• Water pressure on the bubbles increases

Which of the following liquids A, B, C or D, can be used to make a liquid-in-glass thermometer to measure temperatures from -50 °C to 50 °C

• A
• B
• C
• D

Diagram 12 shows two copper blocks L and M, in contact with each other. The initial   temperatures of L and M are 50 °C and 30 °C respectively. 
Which statement is correct when L and M are at thermal equilibrium?   

• Temperature of L is higher than M
• The quantity of heat in L is the same as in M
• Rate of change in temperature of L is bigger than that of M
• Net rate of heat flow between L and M is zero

The specific heat capacity of aluminium is higher than copper. When heat is supplied at the same rate to two identical blocks same mass, which of the following happens?

• the copper block will get heated up faster 
• the copper block will expand faster than aluminium 
• the aluminium block will expand faster than copper block
  
• the rate of temperature rise in the aluminium block is higher