Electrical Conductivity

Q. Is vegetable oil is good conductor of electricity? Why?

Q.

How electricity passes through human body ?

Q. An electric current through a metallic wire is basically the flow of:

1. electrons
2. protons
3. neutrons
4. nucleons

Q. Citrus fruits can conduct electricity because they contain .

1. salts
2. acids
3. bases

Q.

Do liquids conduct electricity? How can we check for the conductivity of liquids using a tester?

Q.

Many liquids that conduct electricity are solutions of _________.

1. acids

2. bases

3. salts

4. acids, bases or salts

Q. Which of the following can be used as a switch in an electric circuit?

1. A strip of paper
2. A wooden piece
3. A piece of chalk
4. An iron piece

Q. Which of the following materials has the highest electrical conductivity?

1. Plastic
2. Copper
3. Wood
4. Glass

Q.

What precaution do you take while handling a switch?

Q. Explain series and parallel circuit.[4 marks]

Q.

Question 5
Which one of the following solutions will not conduct electricity?
(a) Lemon juice
(b) Vinegar
(c) Tap water
(d) Vegetable oil

Q. On adding the salt , what will be the effect on the conductance of solution?

Q.

How is Mercury Heated?

Q. In the circuit shown below, the bulb is not glowing because filled in the jar is not conducting electricity.

Q.

Give one word for the following statement.

The process of coating of iron with zinc to prevent corrosion.

Q. Citrus fruits can conduct electricity because they contain___________.

1. bases
2. distilled water
3. salts
4. acids

Q. Substances which allow electric current to pass through them easily are called .

1. good conductors
2. poor conductors
3. insulators

Q. Which of the following solutions will not make the bulb glow ?

1. Sodium chloride
2. Copper sulphate
3. Silver nitrate
4. Sugar solution in diluted water

Q. Which of the following does not conduct electricity?

1. Sugar solution
2. Vinegar solution
3. Caustic soda solution
4. Lemon juice

Q. Which of these does not conduct electricity?
(a) pure water
(b) salt solution
(c) lime juice
(d) lead of pencil

Q.

Most of the liquids that conducts electricity are solutions of_________.

1. sugar

2. sand or soil

3. acids, bases or salts

4. sugar or alcohol

Q. Statement 1: The flow of current in a poor conductor is impossible.
Statement 2: Under certain conditions, current can flow through a poor conductor.

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

Q. A substance that that has the ability to conduct electricity by dissociating into ions is called an electrolyte.

1. False
2. True

Q.

Question 2

Electric current is to be passed from one body to another. For this purpose, the two bodies must be joined by
(a) cotton thread
(b) plastic string
(c) copper wire
(d) rubber band

Q. Poor conductors of electricity can allow electricity to pass through them under certain conditions.

1. True

2. False

Q. The objects which allow electric current to flow through them easily are known as:

1. Radiators
2. Good conductors
3. Resistors
4. Insulators

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. An electrode is a solid electrical conductor used during electrolysis to connect cell with electrolyte.

1. True
2. False

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

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

Q.

Question 1 (b)
Fill in the blank.
The passage of an electric current through a solution causes _______effects.