Heat

Which of the following produces heat which is not useful to us?

• 1

• 2

• 3

• 4

Which of the following shows a wrong effect of heat on matter?

• 1

• 2

• 3

• 4

Study the instrument as shown.

This instrument is usually used to measure the temperature of ___________________.

• ice

• soil

• volcanic lava

• the human body

Which of the following beakers contains water with the greatest amount of heat?

• Beaker P

• Beaker Q

• Beaker R

• Beaker S

Which of the following is the correct reading shown in the thermometer?

• 47 ^oC

• 53 ^oC

• 55 ^oC

• 67 ^oC

Sam attached three thumbtacks to a metal rod using wax as shown in the diagram. He then heated the rod at point X.

Sam observed that the thumbtacks fell from the rod following a certain order. Which of the following shows the correct order in which the thumbtacks fell from the rod?

• P, Q, R

• R, Q, P

• Q, R, P

• Q, P, R

Bob placed a packet of cold orange juice in a basin of hot water.

Which of the following would take place?

A - The water would decrease in temperature.

B - The orange juice would lose heat to the water.

C - The water would lose heat to the orange juice.

D - The orange juice would increase in temperature.

• C only

• A & B only

• B & D only

• A, C & D only

The diagram show the same part of a train track on two different days.

Which of the following conclusions can be drawn?

• Soil has filled up the gap partially.

• The train track has become worn out.

• The train track has been disfigured by a heavy train.

• The train track has expanded due to an increase in temperature.

100ml of water at 90^oC was poured into each two similar steel containers. Each container was wrapped with a different material ---- a blistered plastic sheet and an aluminium foil. The containers were then left on the table to cool for one hour.

The initial & final temperatures were measured and recorded in a table.

Container P Initial temperature = 90^oC, Final temperature = 70^oC.

Container Q Initial temperature = 90^oC, Final temperature = 49^oC.

The water in container P cooled down more slowly because _______________________.

A there was no wind

B the water was too hot

C plastic is a poor conductor of heat

D the air in the blistered plastic sheet is a good insulator of heat

• A only

• B & D only

• C & D only

• A, B & C only

Which of the labelled parts are made of heat conductors and heat insulators?

• Heat conductors - B & C, Heat insulators - A & D

• Heat conductors - C & D, Heat insulators - A & B

• Heat conductors - A, C & D, Heat insulators - B

• Heat conductors - B, C & D, Heat insulators - A