Effect of heat on Solids

Q.

on which factors does linear expansion depend ?

Q.

State the relationship between the three expansion coefficients of a solid.

Q.

Land cools down faster than water.

1. True

2. False

Q.

What causes convection current in air?

Q.

Match the following:

Column 1	Column 2
Land breeze blows during	Summer
Sea breeze blows during	Winter
Dark colored clothes are preferred during	Day
Light colored clothes are preferred during	Night

Q.

The coefficient of superficial expansion of a solid is twice the linear expansion coefficient of the same solid.

1. True
2. False

Q. In the below experiment, wax is used to attach the drawing pins to the rods of different materials. All the rods are in contact with boiling water. Which of the following pins is going to fall first?

1. Pin A
2. Pin B
3. Pin C
4. Pin D

Q. (a) Why are the windows of the houses in coastal areas made to face the sea?

(b) What is a land breeze?
[3 MARKS]

Q. Normally, engineers keep a small gap at the joint between two rail tracks, because:

1. To change tracks
2. To counter thermal expansion
3. To reduce the train speed
4. To reduce noise

Q. The thermometer shown in the image is called a thermometer.

1. laboratory
2. digital
3. clinical

Q.

Four identical metal cans are coloured with green, yellow, black and white colours. They are placed under the Sun for one hour. Which of the following coloured metal can shows the greatest rise in temperature?

1. Green
2. Yellow
3. Black
4. White

Q. If the concrete roof of a house is replaced by a polished metallic surface, the temperature inside the house will ___________.

1. increase
2. decrease
3. None of the above
4. remain unchanged.

Q. On heating a rod, its length increases. On what factors does the increase in the length depend on?

1. The material of the rod
2. The initial length of the rod
3. The rise in the rod's temperature
4. The cross sectional area of the rod

Q. On heating the rod, the length of the rod increases. On what factors does the increase in length depend on?

1. The material of the rod

2. The length of the original rod

3. The increase in its temperature

4. None of the above.

Q.

What are sea breeze and land breeze?

Q.

List the factors on which linear expansion depends upon.

Q. Wind currents are caused due to
(a) convection currents across land and sea.
(b) a combination of convection currents and rotation of the earth.
(c) the earth's rotation.
(d) convection currents only.

Q. The normal temperature of human body is _________.

1. 37 degree celsius
2. 41 degree celsius
3. 52 degree celsius
4. 47 degree celsius

Q. Heating of iron is a reversible change.

1. True
2. False

Q. The range of clinical thermometers is:

1. 50 to 100 degree celcius
2. -10 to 110 degree celcius
3. 35 to 42 degree celcius
4. -20 to 50 degree celcius

Q. Three paper clips A, B, C are fixed to a metal rod using wax. One side of the rod is being heated as shown in figure. Which of the clip will fall first?

1. Clip B
2. Clip A
3. Clip C
4. All clips will fall down at the same time.

Q. A thermometer is used to measure the temperature of a body.

1. False
2. True

Q. In solid state atoms are closer to each other when compared to gaseous and liquid state.

1. True
2. False

Q.

Which of the following cools down faster?

1. Water

2. Both cool down at the same rate

3. Sometimes land and sometimes water.

4. Land

Q. A piece of charcoal and a piece of shining steel of the same surface area are kept for a long time in an open lawn in bright sun.

(a) The steel will absorb more heat than the charcoal
(b) The temperature of the steel will be higher than that of the charcoal
(c) If both are picked up by bare hand, the steel will be felt hotter than the charcoal
(d) If the two are picked up from the lawn and kept in a cold chamber, the charcoal will lose heat at a faster rate than the steel.

Q. White washed buildings will be _______ in hot weather than the darker buildings.

1. hotter
2. colder
3. wetter
4. drier