Woolen Clothes

Q. Which among the following is not an insulator?

1. Glass
2. Silver
3. Wood
4. Cotton

Q.

What are bad conductors? Give four examples of bad conductors.

Q.

Woolen clothes are poor conductor of heat but they keeps us warm. Give reason.

Q. Why don't we drink hot tea in steel cups instead of ceramic cups?

Q. Shopkeepers selling ice blocks usually cover them with jute sacks. Explain why.

Q. Why are water and air called poor conductors of heat?

Q.

Describe three important applications of thermal insulators from your daily life.

Q.

Describe an experiment to prove that water is a bad conductor of heat energy.

Q.

Why does an iron chair feel colder than a wooden chair in winter?

Q. What are the good and bad conductors of heat? Give two examples of each.

Q. Cooking utensils are made of metals due to their property of ___________.

1. radiation
2. conduction
3. insulation
4. reflection

Q. Pins A, B, and C are attached to the iron rod with the help of wax as shown below. In which order are the pins likely to fall?​

1. A, C, B​
2. C, B, A​
3. All pins will fall at the same time​
4. A, B, C​

Q. Write true or false for given statement :
Black surfaces are poor absorbers of heat radiations.

Q.

What are good conductors? Give four examples for good conductors

Q. Write true or false for given statement :
Water is a bad conductor of heat.

Q.

A thermos flask minimises the flow of heat due to ?

1. Convection

2. Radiation

3. Conduction

4. All of these

Q.

Black object are good _________ of heat.

Q. Seema is in hurry and wants her noodles to cool down faster. She should put it on a plate made of _____.

1. plastic
2. paper
3. steel
4. wood

Q.

Statement 1: Wool is a good conductor of heat.​
Statement 2: Air trapped in between the woollen fabric acts as an insulator for heat. ​

1. Both statements are incorrect ​
2. Statement 1 is correct but statement 2 is incorrect​
3. Statement 2 is correct but statement 1 is incorrect​
4. Both statements are correct​

Q. What is the idea of making double glazed glass windows in cold areas with air trapped in between the 2 glasses?

Q. What are insulators? Give one use of insulators in kitchen.

Q. Why are cooking utensils made up of metals?

Q.

Explain why do we wear woolen clothes in winter?

Q. Fill in the blank :​

Black and dull surface are ________ of heat.

Q.

Why do people wear white clothes in summer and dark clothes in winter?

Q. Woollen clothes save us from cold weather because____. Choose correct statement.
1. Wool is a poor conductor of heat ​
2. Wool has air trapped in between the fibres.​

1. 2 only​
2. Neither 1 nor 2​
3. 1 and 2 both ​
4. 1 only​

Q.

We get heat from the sun by

1. conduction

2. convection

3. radiation

4. insulation

Q.

We wear woolen clothes to protect ourselves from external winds.

1. True
2. False

Q.

What adaptations are seen in polar bear?

Q. A material that allows the flow of heat through it easily is called:

1. Insulator
2. Conductor
3. Capacitor
4. Semiconductor