Tag: physics

Questions Related to physics

To avoid electric shock:

physics when current flows precaution with the electrical circuit precautions to be taken while dealing with current electrical safety devices used to protect from shock of electric current

  1. The insulation of wires must be of good quality

  2. Insulation should be checked from time to time

  3. The appliances must have its metallic case earthed

  4. All

Show answer
Correct Option: D
Explanation:

To avoid electric shock 

$\rightarrow$ The insulation of wires must be of good quality 
$\rightarrow$ Insulation should be checked from time to time 
$\rightarrow$ The appliances must have its metallic case earthed 

Franklin showed that _______ and the spark from our clothes during winters are the same phenomena. Fill in the blanks.
physics some natural phenomena introduction to lightning lightning analysis of natural phenomena

  1. thunder-storm

  2. earthquake

  3. lightning

  4. rain

Show answer
Correct Option: C
Explanation:

Benjamin Franklin, an American scientist, discovered that lightning and spark from your clothes during winters are same phenomena. Electric spark on large scale is known as lightning.

_______ is nature's most powerful display of static electricity.

physics some natural phenomena introduction to lightning lightning analysis of natural phenomena

  1. Current electricity

  2. Lightning

  3. Conduction

  4. Induction

Show answer
Correct Option: B
Explanation:

Lightning is a natural phenomenon, which occurs when two clouds strike with each other and produce huge amount of electricity.

The sparks caused due to friction between two machine parts are:

physics some natural phenomena introduction to lightning lightning analysis of natural phenomena

  1. similar to lighting

  2. not similar to lightning

  3. lightning on a very small scale

  4. none of the above

Show answer
Correct Option: B
Explanation:

Lightning is electrical discharge. The sparks caused in machines due to friction are out of local heating and not connected to electrical discharge.

State whether the given statement is True or False :
To process nitrogen, lightning and other processes help in life existence. 

physics some natural phenomena introduction to lightning lightning analysis of natural phenomena

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Nitrogen is helpful, as all life is dependent on it. Protein in body is made up of nitrogen. To break nitrogen, huge amount of energy is required. This energy is only provided by natural lightning.

When we can observe sparks on an electric post?

physics some natural phenomena introduction to lightning lightning analysis of natural phenomena

  1. When there is huge rain

  2. When there is thunderstorm

  3. When wind blows and shakes the wire

  4. All of the above

Show answer
Correct Option: D
Explanation:

During huge rain, thunderstorm and strong wind, sparks are observed on an electric post.

The fact that lightning and spark are essentially the same phenomena, was discovered in:

physics some natural phenomena introduction to lightning lightning analysis of natural phenomena

  1. 1882

  2. 1752

  3. 1770

  4. 1802

Show answer
Correct Option: B
Explanation:

The fact that lightning and spark are essentially the same phenomena, was discovered in 1752.

Electric spark is the electrical discharge when a ________ electric field creates an ionised channel. Fill in the blank.
physics some natural phenomena introduction to lightning lightning analysis of natural phenomena

  1. sufficiently strong

  2. moderate

  3. weak

  4. very weak

Show answer
Correct Option: A
Explanation:

Electric spark is the electrical discharge that occurs when sufficiently high electric field creates an ionised channel.

Which of the following is not a type of lightning?

physics some natural phenomena introduction to lightning lightning analysis of natural phenomena

  1. Intracloud (IC)

  2. Cloud to Cloud (CC)

  3. Cloud to Ground (CG)

  4. Ground to Cloud (GC)

Show answer
Correct Option: D
Explanation:

There are only 3 types of lightning:

  • Intra-cloud (IC)
  • Cloud to Cloud (CC)
  • Cloud to Ground (CG)
Ground to Cloud lightning does not exist.

Which of the following causes electric sparks?

physics some natural phenomena introduction to lightning lightning analysis of natural phenomena

  1. Wind blowing and shaking electric poles.

  2. When amber rubbed with fur.

  3. When we take off woollen and polyester clothes.

  4. All of the above.

Show answer
Correct Option: D
Explanation:

Electric sparks, small or large, are caused when electric poles are shaken by wind, amber is rubbed with fur and woollen, polyester clothes are taken off.