Tag: some natural phenomena

Questions Related to some natural phenomena

State whether the given statement is True or False :

Depending on which material it is rubbed with, most of the objects can acquire both positive and negative charges in different occasions.

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

  1. True

  2. False

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Correct Option: B
Explanation:

For most of the materials, if those are rubbed with materials occurring higher in electrostatic series, will acquire negative charge. And if those materials are rubbed with materials occurring lower in electrostatic series, will acquire positive charge. Dry human skin, occurring at top of the electrostatic series will always acquire positive charge. Teflon, occurring at the bottom of the electrostatic series will always acquire negative charge.

If we rub our dry forearm with a silk cloth, the hairs on the forearm will stand straight. This is because:

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

  1. of the attraction force between the hairs and the cloth.

  2. of the charge acquired to the forearm due to rubbing.

  3. of the magnetic field created due to rubbing.

  4. none of the above.

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Correct Option: B
Explanation:

When the forearm is rubbed with a cloth of silk, the dry forearm acquires positive charge. So, all the hairs there acquire same positive charge and repel each other. Thus the hairs stand straight after rubbing.

The electrical charges generated by rubbing are:

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

  1. dynamic

  2. static

  3. neutral

  4. none of the above

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Correct Option: B
Explanation:

Static charges are generated by rubbing or friction.

What happens when charged glass rod is brought near a charged plastic straw when rubbed with silk?

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

  1. Repulsion is observed.

  2. Attraction is observed.

  3. No reaction is observed.

  4. None of the above is observed.

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Correct Option: B
Explanation:

When rubbed with silk, glass and plastic acquire opposite charges. So, the glass rod and the plastic straw, after being rubbed by silk, will attract each other.

Inflate two balloons. Hang them in such a way that they do not touch each other. Rub both balloons with woollen cloth and release them. Then:

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

  1. both balloons attract each other.

  2. both balloons repel each other.

  3. both balloons remain at same position.

  4. none of the above happens.

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Correct Option: B
Explanation:

The balloons will be seen to repel each other as both are charged with same polarity.

What happens when a used plastic refill is rubbed with polythene?

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

  1. Only refill gets charged.

  2. Refill and polythene gets charged.

  3. Only polythene gets charged.

  4. Both gets discharged.

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Correct Option: B
Explanation:

Both of them, refill as well as polythene, gets charged by friction.

When a person combs his hair static electricity is sometimes generated by:

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

  1. friction between comb and hair resulting in flow of electrons.

  2. induction between comb and hair.

  3. conducting property of hair.

  4. contact between comb and hair resulting in a charge.

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Correct Option: A
Explanation:

Static electricity, while combing dry hair, is generated by friction between comb and dry hair.

When charges move, they constitute:

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

  1. energy

  2. light

  3. power

  4. electric current

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Correct Option: D
Explanation:

Moving charges constitute electric current.

Rub a glass tumbler with wool. Bring an inflated charged balloon, rubbed with wool, near refill. Then

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

  1. both balloon and tumbler will repel each other.

  2. both balloon and tumbler attract each other.

  3. no reaction will be observed.

  4. the balloon will burst.

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Correct Option: B
Explanation:

When rubbed by wool, glass becomes positive and rubber becomes negative. Opposite charges attract. So, the balloon and the glass tumbler will attract each other.

The atmosphere is held to the earth by _______

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

  1. gravity

  2. clouds

  3. electric force

  4. friction

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Correct Option: A