Detection of Charge

Q.

Identify the name of the device that can be used to test whether an object is carrying a charge or not. When a charged body is brought near the object the two thin leaves attached to the rod move away from each other indicating a presence of charge.

1. Electrolarynx

2. Electrode

3. Electric motor

4. Electroscope

Q. State the sign of the charge acquired by an object when it is charged by positively charged rod through. A)conduction B)induction.Give the reasons for your statement

Q. The medium used in the jar of electroscope is:

1. Vacuum
2. Moist Air
3. Water
4. Any fluid

Q.

Which device can be used to test whether an object is carrying charge or not?

1. Electroscope

2. Electrode

3. Electrolarynx

4. Electric motor

Q. What is the name of the device shown in figure?

1. Needle electroscope
2. Pith ball electroscope
3. Gold leaf electroscope
4. Charge meter

Q. In an electroscope, the foil strips that move apart on detecting a charged body would come back to their initial position after some time. Identify the reason.

1. Electrostatic attraction

2. Bending of foil strips

3. Electric discharge

4. Electrostatic repulsion

Q. Assertion (A): An electroscope can be used to find the presence of charge on a body.
Reason (R): It is based on the principle: Like charges repel each other.

1. Both A and R are true and R is the correct explanation of A
2. Both A and R are true but R is not the correct explanation of A
3. A is true but R is false
4. A is false but R is true

Q. In an atom, positively charged particles called are present at the centre and revolve around it.

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

Q. Which of the following is used to check whether a body is charged or not?

1. Seismograph
2. Seismogram
3. Electroscope
4. Richter scale

Q. A device that can be used to test whether an object is carrying a charge or not, is known as an .

1. electrometer
2. electroscope
3. electroplate
4. electrolyte

Q. Label the parts of an atom:

1. Electron
2. Proton
3. Neutron

Q. The net electric charge on an atom is .

1. infinite
2. zero
3. unity

Q. What is the name of the device shown in figure?

1. Needle electroscope
2. Pith ball electroscope
3. Gold leaf electroscope
4. Charge meter

Q. There are three types of electric charges - positive, negative and neutral.

1. False
2. True

Q.

In an electroscope, how do the charge from the charged object transfers to the foil strips? [1 MARK]