Tag: physics

Quizzes (598) Questions (13441)

Questions Related to physics

Multiple choice physics effects of electric current precaution with the electrical circuit precautions to be taken while dealing with current devices used to protect from shock of electric current

Wires used in homes are usually covered with materials like plastic or rubber. The primary reason for doing this is to :

  1. prevent rusting

  2. make handling easier

  3. prevent shocks & short circuits

  4. make them look beautiful
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Wires used in homes are usually covered with materials like plastic or rubber, because plastic and rubber are bad conductors of electricity and do not allow current to flow. This prevents us from getting a shock due to a  short circuit.
Multiple choice physics electric circuits precaution with the electrical circuit precautions to be taken while dealing with current devices used to protect from shock of electric current

Electricians use rubber gloves while working because

  1. rubber is an insulator

  2. rubber is a good conductor

  3. it is easy to work while wearing gloves

  4. none ofthese
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Electricians use rubber gloves while working because rubber is an insulator and hence prevents them from getting an electric shock.

Multiple choice physics household circuits precaution with the electrical circuit precautions to be taken while dealing with current devices used to protect from shock of electric current

Wires used for electric supply go are generally made up of:

  1. silver

  2. aluminium

  3. copper

  4. both b and c
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Electric is generated at power station. It is brought to one house by two thick copper wires or aluminium wires fixed once fall electric poles

Multiple choice physics electric circuits precaution with the electrical circuit precautions to be taken while dealing with current devices used to protect from shock of electric current

Which of the following is not a safety measure commonly used in electric circuits.

  1. An electric fuse is connected in parallel

  2. Proper earthing of all electric circuit is done

  3. Fuse protects the circuit from overloading

  4. All
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

An electric fuse is connected in parallel. This is not a safety measure. Fuse is always connected in series.

Multiple choice physics household circuits precaution with the electrical circuit precautions to be taken while dealing with current devices used to protect from shock of electric current

High tension wires has

  1. high resistance.

  2. low resistance.

  3. high young's modulus.

  4. low young's modulus.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

High tension wire is made by twisting together a number of thin wires insulated from each other so as to provide large surface area. It helps to radiate more heat and prevents burning of wire.

Multiple choice physics electric circuits precaution with the electrical circuit precautions to be taken while dealing with current devices used to protect from shock of electric current

In domestic electrical circuit, switches are used in

  1. Neutral wire

  2. Earth wire

  3. Live wire

  4. All of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Switches are connected in live wire so that when the switch is in off position, no current flows through circuit. As a result there will not be any danger of electrical shock.

Multiple choice physics household circuits precaution with the electrical circuit precautions to be taken while dealing with current devices used to protect from shock of electric current

A high tension wire has a _____ resistance. Fill in the blank.

  1. Low

  2. High

  3. Equal

  4. None
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A high tension wire has a low resistance and large surface area. Instead of taking a single thick wire of low resistance, it is made by twisted together a number of thin wires insulated from each other so as tat it can radiate the head provided.