Tag: transfer of charge

Quizzes (0) Questions (111)

Questions Related to transfer of charge

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

When a charged body is brought near an electroscope:

  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.
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  1. Through some conductor

  2. Directly to the Earth

  3. Through transformer

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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?

  1. Positive

  2. Negative

  3. Partially positive

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

Multiple choice physics some natural phenomena transfer of charge types of charges and their interaction transfer of charges
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 ________.

  1. earthing

  2. discharging

  3. both A and B

  4. none of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

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

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

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.

  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.
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

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

  1. $192 km$

  2. $384 km$

  3. $1920 km$

  4. $3840 km$
Reveal answer Fill a bubble to check yourself
C Correct answer
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, $d = (4 km \,\,s^{-1}) (480 s) = 1920 km$
Multiple choice physics structure of earth seismic waves and tsunami causes of earthquakes origin of earth and its internal energy transfer of charge lightning safety

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

  1. Fault zone

  2. Eruption zone

  3. Explosive zone

  4. Sliding zone
Reveal answer Fill a bubble to check yourself
A Correct answer
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.