class 11 heat and thermodynamics

For the formula:
 Q= m c ∆T
The  units for specific heat are:

• g /J C
• °C/g J
• kJ/g
• J/g°C

What would be the effect on the particles if more heat is supplied to the system?

• They would slow down
• They would stop moving
• They would speed up
• There would be no effect

If the specific heat of water is 4,186 J/kg∙°C, how much heat is required to increase the temperature of 1.2 kg of water from 23 °C to 39 °C? 

• -80,371.2
• 44,938.6
• 80,371.2
• 112,575.9

Steam at temperature of 100°C is piped to 3 kg of water at the temperature of 5°C until the water reaches the boiling point. The mass of the steam required is
[Specific latent heat of vaporization of water = 2.26 × 10⁶ J kg⁻¹, specific heat capacity of water = 4.2 × 10³ J kg⁻¹°C⁻¹]

• 0.26 kg
• 0.53 kg
• 0.94 kg
• 1.89 kg

What is the definition of CONDUCTION?

• When heat is transferred from objects like rays of light or electromagnetically.
• a  hot liquid or air that  expands, becomes less dense, and rises or becomes more dense, and sinks.
• When heat transfers from objects that are touching.
• When heat transfers through the heater or AC in your house.

What is the definition of CONVECTION

• When heat transfers through the heater or AC in your house.
• When heat transfers from objects that are touching.
• a  hot liquid or air that  expands, becomes less dense, and rises or becomes more dense, and sinks.
•  hot liquid or air that  expands, becomes less dense, and rises or becomes more dense, and sinks.

What is the definition of RADIATION

•  hot liquid or air that  expands, becomes less dense, and rises or becomes more dense, and sinks.
• When heat is transferred from objects like rays of light or electromagnetically.
• When heat transfers from objects that are touching.
• When heat transfers through the heater or AC in your house.

The Gulf Stream is a current that brings warm ocean water from the south to the north. What type of heat transfer is this?

• conduction
• convection
• radiation
• Insolation 

Select the correct formula to calculate linear change in length...

• ΔL = LαΔT
• ΔT = ΔL/Lα
• σ = F/A
• ε = ΔL/L

Calculate the change in length of a 100mm aluminium bar that has increased in temperature by 55⁰C.  
Take the coefficient of expansion to be 25 x 10^-6

• 0.258mm
• 0.1375mm
• 1.23mm
• 1.37mm