Physics F4 4.2

Water is used as coolant in car engine because

• water has a low viscosity.
• water helps to clean the engine.
• water has a high specific heat capacity
• water has a high specific latent heat of fusion.

“Water takes a shorter time to boil when heated at high lands than at low lands, although the same amount of energy is used.”

• The temperature is lower at high lands
• The atmospheric pressure is lower at high lands
• The air is less damp at high lands
• The rate fo heat loss is faster at high lands

Which of the following material is most suitable in making the handle of a pot?

• P
• Q
• R
• S

A 800 g block of metal is heated from 28°C to 80°C. What is the total thermal energy is absorbed by the metal block if its specific heat capacity is 600 J kg–1 °C–1?

• 1.3 × 10^4 J
• 2.5× 10^4 J
• 1.6× 10^4 J
• 1.3× 10^4 J

Which of the following affects the heat capacity of an object?

• Mass of the object
• Shape of the object
• Amount of heat absorbed
• Amount of heat loss to the surroundings

More heat energy is required to raise the temperature by 1°C for 1 kg of lead than for 1 kg of aluminium. This observation is due to the difference in

• density
• melting point
• specific latent heat
• specific heat capacity

If heat energy is supplied at the same rate to each solid, which solid will be the first to melt?

• W
• X
• Y
• Z

100 g of water at 20°C is poured into a beaker containing 200 g of water at 80°C. What is the final temperature of the mixture?

• 30°C
• 50°C
• 60°C
• 70°C

The phenomena of sea breeze and land breeze is due to

• the specific heat capacity of the sea is higher than the land.
• specific latent heat of vaporisation absorbed by the sea.
• the heat capacity of the air is higher than the land.
• the heat capacity of the air is higher than the sea.

The heat is supplied at the same rate. After 5 minutes the temperature of liquid in beakers P, Q, and R are recorded.

• θP > θQ > θR
• θQ > θP > θR
• θR > θP > θQ
• θR > θP > θQ