Tag: transfer of charge

Questions Related to transfer of charge

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

Show answer
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.

Show answer
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.

The process of transferring of charge from a charged object to the Earth is called:

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

  1. lightning

  2. thundering

  3. earthing

  4. all of the above

Show answer
Correct Option: C
Explanation:

When a charged object comes in contact with the Earth, the charges flow into the Earth and the body gets discharged. This process is called earthing.

Spark produced in sky during a thunderstorm are called

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

  1. Lightning

  2. Electric current

  3. Both A and B

  4. None of these

Show answer
Correct Option: A

Assertion : An earthquake will not cause uniform damage to all building in an affected area, even if they are built with the same strength and materials.
Reason : The one with its natural frequency close to the frequency of seismic wave is likely to be damaged less.

physics structure of earth seismic waves and tsunami causes of earthquakes origin of earth and its internal energy transfer of charge lightning safety

  1. If both assertion and reason are true and reason is the correct explanation of assertion.

  2. If both assertion and reason are true and reason is not the correct explanation of assertion.

  3. If assertion is true but reason is false.

  4. If both assertion and reason are false.

Show answer
Correct Option: C
Explanation:

An earth quake will not cause uniform damage to all building in an affected area because the natural frequencies of a building depend on its height and other size parameters and the nature of building materials.
The one with its natural frequency close to the frequency of seismic wave is likely to be damaged more.

An earthquake generates both transverse $(S)$ and longitudinal $(P)$ sound waves in the earth. The speed of $S$ waves is about $4 \,\,km \,\,s^{-1}$ and that of $P$ waves is about $8 \,\,km \,\,s^{-1}$. A seismograph records $P$ and $S$ waves from an earthquake.The first $P$ wave arrives $4$ min before the first $S$ wave. The epicentre of the earthquake is located at a distance of about

physics structure of earth seismic waves and tsunami causes of earthquakes origin of earth and its internal energy transfer of charge lightning safety

  1. $192 km$

  2. $384 km$

  3. $1920 km$

  4. $3840 km$

Show answer
Correct Option: C
Explanation:
Let $\nu _1, \nu _2$ be speed $S$ of $S$ and $P$ waves and $t _1,t _2$ be the time taken by these waves to travel to reach the seismograph. Let the epicenter of the earthquake is located at a distance $d$ from the seismograph. Then,
$d = V _1 t _1 = V _2 t _2$          ................ .....(i)
Here, $V _1 = 4 km \,\,s^{-1}$ and $V _2 = 8 km \,\,s^{-1}$
$\therefore 4t _1 = 8t _2 \Longrightarrow t _1 = 2t _2$           ....(ii)
and  $t _1 - t _2 = 4 min = 240 s$
$\therefore 2t _2 - t _2 = 240$      ....................  [using (ii)]
or $t _2 = 240 s$
put in Eq. (ii), we get,
$t _1 = 2 \times 240 s = 480 s$
From Eq. (i), we get, $d = (4 km \,\,s^{-1}) (480 s) = 1920 km$

The weak zone around the boundaries of plates underneath the Earth, which is prone to slide and cause an earthquake is commonly known as :

physics structure of earth seismic waves and tsunami causes of earthquakes origin of earth and its internal energy transfer of charge lightning safety

  1. Fault zone

  2. Eruption zone

  3. Explosive zone

  4. Sliding zone

Show answer
Correct Option: A
Explanation:

The weak zone around the boundaries of plates underneath the Earth, which  is prone to slide and cause an earthquake is known as Seismic or Fault Zones.

The correct option is A.