Insulator (Bad Conductors)

Q. Why is electrical wiring usually made of copper, but not silver?

1. Copper is a better conductor than silver.
2. Copper is less magnetic compared to silver.
3. Copper is less expensive than silver.
4. Silver is an insulator.

Q.

Which of the following is bad conductor of electricity?

1. Alcohol

2. Salt water

3. Tap water

4. Distilled Water

Q. Which of the following is a bad conductor of electricity?

1. ORS drink
2. Distilled water
3. Tap water
4. Salt water

Q. When electric current passes through a wire, it behave like a ______.

1. battery
2. fuse
3. magnet
4. compass

Q.

Electric current is to be passed from one body to another. For this purpose, the two bodies must be joined.

1. Cotton thread

2. Plastic string

3. Copper wire

4. Rubber band

Q.

1. Name two materials which do not conduct electricity.

Q.

The substances having very low electrical resistance are called ___________ .

Q.

Good conductors of electricity allow an electric current to pass through them.

1. True
2. False

Q. Which of the following substances offers high resistance to flow of electric charges?

1. Aluminium
2. Silver
3. Nichrome
4. Copper

Q.

State three characteristics of the material which make it useful for making heating elements of electric devices.

Name two such materials used industrially.

Q. Which of the following substances offers high resistance to flow of electric charges?

1. Aluminium
2. Silver
3. Nichrome
4. Copper

Q. Which of the following things is having the least resistance?

1. Bulb
2. Buzzer
3. Fan
4. Fuse wire

Q.

A puppy, trapped by a current carrying wire, was barking for help. A man passing by used a wooden stick to save it. Why did he prefer wooden stick and not his hands?

1. Because wood is a poor conductor of electricity

2. Because wood is a good conductor of electricity

3. None of above

4. Wood cannot act as insulator

Q. Adding common salt to distilled water makes it a bad conductor of electricity.

1. False
2. True

Q. Identify the material which does not allow electricity to pass through easily.​

1. Iron rod
2. Clay pot
3. Copper sheet
4. Silver spoon

Q.

Materials that have electrons that are free to move around in them are called bad conductors of electricity.

1. True
2. False

Q. Adding common salt to distilled water makes it a bad conductor of electricity.

1. False
2. True

Q. Which of the following is a bad conductor of electricity?

1. Salt water
2. Tap water
3. ORS drink
4. Distilled water

Q.

The objects which do not allow electric current to flow through them easily are known as:

1. Insulators

2. Conductors

3. Resistors

4. None of these

Q.

Mercury is a/an__________ of electricity but oil is a/an__________ of electricity.

Q.

1. Carbon
2. Copper
3. Sodium
4. None of the above

Q. Which of the following is a bad conductor of electricity?

1. Salt water
2. Distilled water
3. Tap water
4. ORS drink

Q.

A long wire will have__________ for the same cross-sectional area.

1. more resistance than short wire

2. less resistance than short wire

3. same resistance as short wire

4. more tensile strength

Q. Which of the following things is having the least resistance?

1. LED Bulb
2. Fan
3. Fuse wire
4. Room heater

Q. Which of the following substances offers high resistance to flow of electric charges?

1. Nichrome
2. Copper
3. Aluminium
4. Silver

Q. The power circuit in the house uses ______ ampere fuse.

1. 15
2. 220
3. 50
4. 5

Q.

Statement 1: Poor conductors do not allow electric current to flow through them.

Statement 2: Poor conductors do not allow electric current to flow through them easily.

1. Both the statements are true and statement 2 is the correct explanation of statement 1.

2. Statement 1 is true and statement 2 is false.

3. Statement 1 is false and statement 2 is true.

4. Both the statements are true and statement 2 is not the correct explanation of statement 1.

Q.

The objects which do not allow electric current to flow through them easily are known as:

1. Poor conductors of electricity

2. Resistors

3. None of these

4. Good conductors of electricity

Q. Identify the examples of the bad conductors of electricity from the following options.

1. Sulphuric acid
2. Air
3. Rubber
4. $H_{2}O$

Q. Bad conductor of electricity is

1. $H_2{F}_2$
2. $HCl$
3. $HBr$
4. $HI$