Tag: physics

Questions Related to physics

According to law of conservation of energy, heat energy is transformed into which two types of energy?

physics heat energy transfers heat energy heat, internal energy and work internal energy

  1. Kinetic and potential energy

  2. Mechanical and potential energy

  3. Kinetic and thermal energy

  4. Nuclear and potential energy

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Correct Option: A
Explanation:

According to law of conservation of energy, heat energy is transformed into Kinetic and potential energy

The nature of charge on the object can be detected by:

physics some natural phenomena transfer of charge types of charges and their interaction transfer of charges

  1. microscope

  2. electroscope

  3. electrometer

  4. telescope

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Correct Option: B
Explanation:

A pre-charged electroscope detects the nature of charge on a charged body.

When a charge passes from a charged object to an uncharged one, the process is called:

physics some natural phenomena transfer of charge types of charges and their interaction transfer of charges

  1. conduction

  2. induction

  3. discharging

  4. none of the above

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Correct Option: A
Explanation:

Conduction is the process in which uncharged object acquires charge when it it brought in contact with the charged object.

What happens when the end of the paper clip of electroscope is touched by hands?

physics some natural phenomena transfer of charge types of charges and their interaction transfer of charges

  1. Electric current is produced 

  2. Foil strips remain as it is

  3. Foil strips collapse

  4. None of the above

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Correct Option: C
Explanation:

Because the charges on foil strips gets discharge through air body as soon as paper clip of electroscope is touched by hand, the foil strips collapse.

Opening up of strips of an electroscope is an indication of:

physics some natural phenomena transfer of charge types of charges and their interaction transfer of charges

  1. proximity of a conductor.

  2. proximity of a charged body.

  3. proximity of an uncharged body.

  4. earth connection.

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Correct Option: B
Explanation:

When a charged body comes close to an electroscope, charges are induced to the electroscope. These charges flow down to the metal strips which open up due to repulsion for having similar charges.

When a charged body is brought near an electroscope:

physics some natural phenomena transfer of charge types of charges and their interaction transfer of charges

  1. the strips of foils opens up.

  2. the strips of foils close.

  3. the strips open and close simultaneously.

  4. the strips neither open nor close.

Show answer
Correct Option: A
Explanation:

When a charged body is brought near the top conducting disc of an electroscope, the disc gets induced with charges. These charges run down to the metal strips hanging from the paper clip. Now as both the strips get similar charge, those repel each other and thus open up.

In the process of earthing, how does charges get discharged to Earth?

physics some natural phenomena transfer of charge types of charges and their interaction transfer of charges

  1. Through some conductor

  2. Directly to the Earth

  3. Through transformer

  4. None of the above

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Correct Option: A
Explanation:

Earthing is important for the protection of human life as well as property. For discharging of charges to the Earth some conductor is required, so that electric charges gets conducted into the Earth.

What will be the nature of charge on the metal paper clip of electroscope when a negatively charged body is brought in contact with it?

physics some natural phenomena transfer of charge types of charges and their interaction transfer of charges

  1. Positive

  2. Negative

  3. Partially positive

  4. None of the above

Show answer
Correct Option: B
Explanation:

The nature of charge will be negative. Here charging is taking place due to contact and metal paper clip will bear the same charge as the charged body. This is charging by conduction.

If a object is charged by contact, it will acquire:

physics some natural phenomena transfer of charge types of charges and their interaction transfer of charges

  1. opposite charge.

  2. negative charge always.

  3. same charge as the charged body.

  4. positive charge always.

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Correct Option: C
Explanation:

If an object is charged by contact or conduction, it acquires the same charge as the charged object.

When a foil strips get touched by your hand, it loses charge to the Earth through your body. This process is also referred to as ________.
physics some natural phenomena transfer of charge types of charges and their interaction transfer of charges

  1. earthing

  2. discharging

  3. both A and B

  4. none of the above

Show answer
Correct Option: A
Explanation:

When we touch the strips, the charges get discharged through our body to the Earth and this process is known as earthing.