Conductor and Insulators

Q.

Is boiling water conduction or convection?

Q.

Is the ice melting an example of convection?

Q.

What are the differences between conductors and insulators? [3 MARKS]

Q.

Question 10
A wooden spoon is dipped in a cup of ice cream. Its other end

(a) becomes cold by the process of conduction.
(b) becomes cold by the process of convection.
(c) becomes cold by the process of radiation.
(d) does not become cold.

Q. Why is air a bad conductor

Q.

Is pure water an insulator?

Q.

In a semiconductor, current conduction is due to_________.

Q.

Define conduction of electricity?

Q.

In a steady-state, what happens to the temperature of each part of the rod?

Q.

How does heat transfer takes place by convection? Can heat transfer by convection takes place in solids?

Q.

Question 14

For setting curd, a small amount of curd is added to warm milk. The microbes present in the curd help in setting if the temperature of the mixture remains approximately between ${35}^{\circ }C$ to ${40}^{\circ }C$. At places, where room temperature remains much below the range, setting of curd becomes difficult. Suggest a way to set curd in such a situation.

Q.

Wood, paper, and glass are __________ conductors of heat

Q.

What Is conduction in simple words?

Q.

In solids heat is transferred by _______.

Q.

Is Boiling An Egg Conduction Or Convection?

Q.

What happens when an insulator is placed in an electric field?

Q.

Discuss why wearing more layers of clothing during winter keeps us warmer than wearing just one thick piece of clothing.

Q.

Question 10

To keep her soup warm, Paheli wrapped the container, in which it was kept with a woollen cloth. Can she apply the same method to keep a glass of cold drink cool? Give reason for your answer.

Q.

Differentiate between convection and conduction? How is food cooked? [3 MARKS]

Q.

The property of a conductor due to which it opposes the flow of current is known as:

1. Conductance.

2. None of these.

3. Convection.

4. Resistance.

Q.

What is an ideal inductor?

Q.

Which of the following is the incorrect order of dipole moment?

1. $\mathrm{HF}>\mathrm{HCl}>\mathrm{HBr}$

2. ${\mathrm{NH}}_3>{\mathrm{NCl}}_3>{\mathrm{NF}}_3$

3. ${\mathrm{NH}}_3>{\mathrm{NF}}_3>{\mathrm{NCl}}_3$

4. ${\mathrm{CH}}_3\mathrm{Cl}>{\mathrm{CH}}_3\mathrm{F}>{\mathrm{CH}}_3\mathrm{Br}$

Q. Distilled water is a poor conductor of electricity. On the other hand, tap water when brought into contact with an electrical conductor can cause fatal electrocution. What makes the difference?

1. Tap water has extra electrons.
2. Impurities in tap water has ions.
3. Tap water has static electricity.
4. Tap water has a conductor in it.

Q.

Conduction is the process of heat transfer from the hotter to the colder end of a body.

1. True
2. False

Q.

When a metal conductor connected to the left gap of a meter bridge is heated, the balancing point.

1. Shifts towards right

2. Shifts towards left

3. Remains unchanged

4. Remains at zero

Q.

21. ____ metal is used in storage batteries.

Q.

Which one of the following is a poor conductor of heat?

1. Silver

2. Copper

3. Mercury

4. Aluminium

Q. Why do cooking vessels usually have copper bottoms?

1. Copper is an insulator of heat.
2. Copper is cheap.
3. Copper has low melting point.
4. Copper is a good conductor of heat

Q.

How does the hair of certain animals help in keeping their bodies warm?

Q.

Why does an igloo, made of snow, keep warm?