Wire

Q.

Which of the following is a good conductor of electricity?

1. Conductor

2. Insulator

3. Electric switch

4. All of these

Q.

Conductors and insulators both are equally important. Explain why?

Q.

The thin wire that gives off the light in a bulb is known as a filament .

1. None of these

2. Filament of the bulb

Q. Conductors and insulators are equally important. Explain why? [5 MARKS]

Q.

Which of the following is not an electrical component ?

1. Cell

2. pen

3. copper

4. all of these

Q. Wires used in a circuit should always be conductors.

1. True
2. False

Q. Filament is made of

Q.

Can electric bulb with broken filament glow?

Q. Preeti is running short of connecting wires. To complete an electric circuit, she may use:

1. Thick thread

2. Rubber pipe

3. Steel spoon

4. Glass bangles

Q. The thin wire that emits light inside a bulb when is passed through it is known as a .

1. current
2. filament
3. light
4. conductor

Q.

Give one relevant example for each of the following transformations of energy:

(i) mechanical energy to electrical energy.

(ii) electrical energy to heat energy.

Q. Will the bulb glow in the circuit shown in figure? Explain.

Q.

Write the differences between conductors and insulators?

Q. To replace a steel safety pin connected in a circuit as shown, which among the following should be used to complete the circuit?

Q. A battery lights a bulb. The electric energy on flowing through the filament of the bulb, first changes into ______ energy and then into the _______ energy.

1. heat; light
2. mechanical; heat
3. mechanical; light
4. light; heat

Q. A student, while making a circuit to make a bulb glow using a dry cell, conected the plastic covering of the wire to the cell, instead of the metal wire inside it. Will current flow in the circuit? Why?

Q. Wires used in a circuit should always be conductors.

1. True
2. False

Q. A battery lights a bulb . Describe energy change involved in this process .

Q. A battery made up of two cells has ________ terminals.

1. one
2. two
3. three
4. four

Q. The thin wire that emits light inside a bulb when is passed through it is known as a .

1. current
2. filament
3. light
4. conductor

Q. It is not wise to connect the two terminals of a battery directly without connecting it through a bulb or switch.

1. True
2. False

Q. When electricity is passed through an electric bulb it gives out heat and sound.

1. False
2. True

Q. The thin wire that emits light inside a bulb when is passed through it is known as a .

1. current
2. filament
3. water
4. conductor

Q. Which of the following is the part of an electric bulb that emits light?

1. Filament
2. Metal base
3. Glass bulb
4. Core

Q. The thin wire that emits light inside a bulb when is passed through it is known as a .

1. current
2. filament
3. light
4. conductor

Q. If a bulb is designed for an oxygen-free chamber, we would not require any glass cover around the bulb.

1. True
2. False

Q.

A thin wire that emits light in a bulb is known as _____.

1. refractor

2. insulator

3. filament

4. reflector