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Electric Current and its Effects

All about electric current and its effect.

15 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

It is always said that before buying any electric device, one should look for the ISI mark on it. What does this mark ensure?

  1. The product conforms the Bureau of Indian Standards.
  2. The device is safe to use.
  3. The device results in less wastage of electricty.
  4. The device is original.
  5. All of the above
Question 2 Multiple Choice (Single Answer)

Certain symbols in electric circuit diagrams are used to

  1. represent different components
  2. understand the circuit
  3. make the diagram more attractive
  4. Only 1 and 2
  5. 1, 2 and 3
Question 3 Multiple Choice (Single Answer)

A closed loop giving a return path to the electric current is

  1. electric path
  2. electric circuit
  3. electric network
  4. electric current
  5. None of these
Question 4 Multiple Choice (Single Answer)

Which of the following devices can be used to reduce the maximum wastage of electricity and still glow bright?

  1. Compact fluorescent lamp
  2. A blue coloured bulb
  3. Halogen lamp
  4. LED bulb
  5. None of these
Question 5 Multiple Choice (Single Answer)

Which of the following reasons is/are correct behind the using of tungsten in an incandescent bulb?

  1. It is lustrous and shining.
  2. It has very high melting point.
  3. It has a low melting point.
  4. It is a bad conductor of heat.
  5. All of the above
Question 6 Multiple Choice (Single Answer)

The heating of a heater does not depend upon the

  1. material of the wire used
  2. length of the wire used
  3. colour of the wire used
  4. thickness of the wire used
  5. None of these
Question 7 Multiple Choice (Single Answer)

The minimum number of cells required to make a battery is

  1. 1
  2. 2
  3. 4
  4. 6
  5. 10
Question 8 Multiple Choice (Single Answer)

Which of the following problems will arise when the insulation of the wires has come off resulting in the direct touching of wires in a circuit?

  1. Short circuit
  2. Overloading
  3. Fluctuation
  4. Circuit will not be complete.
  5. None of these
Question 9 Multiple Choice (Single Answer)

After overloading of current in a wire, the circuit breaks by MCBs. How can the electric supply be resumed?

  1. One has to replace the melted fuse wire with a new one.
  2. One has to replace the MCB with a new one.
  3. One has to switch it on.
  4. One has to lessen the load.
  5. None of these
Question 10 Multiple Choice (Single Answer)

A magnetic compass kept near a current conducting wire shows deflection because of the magnetic field produced by the current. It is oriented ______ of the current flow.

  1. parallel and in the same direction
  2. parallel, but in the opposite direction
  3. perpendicular to the direction
  4. at 45o to the direction
  5. None of these
Question 11 Multiple Choice (Single Answer)

What will happen to a metal wire through which current is flowing?

  1. It will increase in length.
  2. It will get hot.
  3. It will glow.
  4. It will vibrate.
  5. All of the above
Question 12 Multiple Choice (Single Answer)

Which of the following is the use of argon filled in the bulb?

  1. To prevent the filament from catching fire
  2. To give strength to the inner wall of the bulb
  3. To help it light
  4. To prevent tungsten from melting fast
  5. All of the above
Question 13 Multiple Choice (Single Answer)

What is the full form of MCB?

  1. Major circuit breaker
  2. Micro circuit breaker
  3. Miniature circuit breaker
  4. Major circuit board
  5. Miniature circuit board
Question 14 Multiple Choice (Single Answer)

Why do heating appliances have a highly coiled element?

  1. To increase the surface area
  2. To increase the strength
  3. To provide more heat
  4. Only (1) and (3)
  5. All of these
Question 15 Multiple Choice (Single Answer)

Which of the following is the odd one out?

  1. Electric iron
  2. Water heater
  3. Geyser
  4. Juicer
  5. Toaster
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