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Electric Current and Its Effects

Description: Electric current heating effect magnetic effect
Number of Questions: 15
Created by:
Tags: Electric current heating effect magnetic effect Median of Data Interpreting Bar Graphs Arithmetic Mean of Data Symbols for Electric Circuit Components Making of an Electric Circuit Diagram Heating Effects of Electric Current Working and Usage of Electric Fuses Electromagnets and their Working Magnetic Behavior of Current Carrying Wire Electric Current and its Effects
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Which of the following electric components is represented by two parallel lines, one longer than the other?

  1. Two ends of a wire

  2. Open switch

  3. Cell

  4. Bulb

  5. None of these

Show answer
Correct Option: C
Explanation:

Yes, it is correct. Cell is represented by two parallel lines, one longer than other. The longer one represents positive terminal and shorter one represents the negative terminal.

Which of the following statements regarding the heating effects of current is/are true?

  1. A wire shows heating effect when current is allowed to flow for a long time.

  2. Nichrome shows less heating effect than aluminium.

  3. Wires of less resistance show more heating effect.

  4. The amount of heat produced is inversely proportional to square of current flowing through the resistors.

  5. All of the above

Show answer
Correct Option: A
Explanation:

Yes, it is correct. A wire becomes hot when it is heated for a long time and hence shows heating effect.

In a series of small bulbs, one of the bulb fuses. Will the series of bulbs glow when the switch is on?

  1. The series of bulbs up till the fuse bulb will glow.

  2. The series of bulbs will glow as it is, except the fused bulb.

  3. The series of bulbs will not glow.

  4. The series of bulb just after the fused bulb, will glow.

  5. None of these

Show answer
Correct Option: C
Explanation:

Yes, it is correct. Current passes through each bulb and because of the fused bulb, the circuit will be broken. Hence, the series of bulbs will not glow.

Which of the following properties should the filament of an incandescent bulb have?

a. High melting point b. High thermal resistance c. Reactive towards other gases d. Corrosion free

  1. Only a and c

  2. Only b and d

  3. Only a, b and d

  4. Only a, b and c

  5. All of the above

Show answer
Correct Option: C
Explanation:

Yes, it is correct. All the given properties should be there in the filament of an incandescent bulb, so that the tungsten filament can be used for a long time.

Which of the following has a very low melting point?

  1. Filament of a bulb

  2. Fuse element

  3. Metal plate of an electric iron

  4. Coil of heater

  5. None of these

Show answer
Correct Option: B
Explanation:

Yes, it is correct. The melting point of a fuse element is very low. 

When current is switched on through a wire, why does a magnetic compass needle kept nearby get deflected?

  1. Because of the movement of electric current

  2. Because of the electric field created around the wire

  3. Because of the magnetic field around the wire

  4. Because of the heating effect of the electric current

  5. None of these

Show answer
Correct Option: C
Explanation:

When electric current passes through a conducting wire, a magnetic field is created around the wire. The magnetic field causes deflection in the magnetic compass needle.

If in a circuit, electric current flows in a clockwise direction, will the compass needle deflect? If yes, then in which direction?

  1. No, the needle will not deflect.

  2. Yes, the needle will deflect in clockwise direction.

  3. Yes, the needle will deflect in anticlockwise direction.

  4. Yes, the needle will deflect in clockwise direction and then, come back to its original position.

  5. Yes, the needle will deflect in anticlockwise direction and then, come back to its original position.

Show answer
Correct Option: B
Explanation:

Yes, it is correct. The deflection of the needle depends upon the flow of current. When the current flows clockwise, the compass needle deflects clockwise.

Which of the following effects of current did H. C. Oersted demonstrate for the first time?

  1. Heating effect of current

  2. Chemical effect of current

  3. Magnetic effect of current

  4. Photoelectric effect of current

  5. None of these

Show answer
Correct Option: C
Explanation:

Yes, it is correct. Oersted demonstrated the magnetic effect of current. 

In an electric heater, current is allowed to flow through the coil. It turns red and is ready to use. Which of the following energy conversions takes place here?

  1. Electric energy - Chemical energy

  2. Electric energy - Gravitational energy

  3. Electric energy - Heat energy

  4. Electric energy - Potential energy

  5. None of these

Show answer
Correct Option: C
Explanation:

Yes, it is correct. The electric energy of the current is converted into heat energy by passing current through the coil for long.

Which of the following forms an electromagnet?

  1. Iron nail coiled with insulated copper wire

  2. Iron nail kept near a copper coiled wire

  3. Iron nail coiled with insulated copper wire, through which current is flowing

  4. Iron nail kept near a copper coiled wire, through which current is flowing

  5. Iron nail kept near a natural magnet

Show answer
Correct Option: C
Explanation:

Yes, it is correct. A magnetic material when placed between a current carrying coil, behaves like a magnet. 

Many of our electrical home appliances use electromagnetism as a basic principle of working. Choose the odd one out.

  1. Electric door bell

  2. Electric fan

  3. Loudspeakers

  4. Electric geyser

  5. None of these

Show answer
Correct Option: D
Explanation:

 It shows the heating effect of electric current.

The magnetic material between a current-carrying coil

  1. becomes a permanent magnet

  2. is a magnet till the time current passes through it

  3. loses its magnetic property to some extent and gets weak

  4. changes its shape and acquires magnetic properties

  5. None of these

Show answer
Correct Option: B
Explanation:

Yes, it is correct. The iron nail between the current-carrying coil is a magnet till it is in the magnetic field of electric current. This shows the magnetic effect of current.

The positive terminal of a cell is represented by

  1. long horizontal line

  2. long vertical line

  3. short horizontal line

  4. short vertical line

  5. two parallel lines

Show answer
Correct Option: B
Explanation:

Yes, it is correct. The two parallel lines represent the cell from which the long vertical line shows the positive terminal.

If A is a stronger electromagnet than B, then

  1. number of turns in the current-carrying coil around A > B

  2. strength of current in the coil around A > B

  3. the metal inside has more magnetic property in A

  4. Both 1 and 2

  5. 1, 2 and 3

Show answer
Correct Option: E
Explanation:

All the three options are correct.

Match the following:

     
a. Torch 1. Wet battery
b. Electric bell 2. Metal plate
c. Car 3. Dry cell
d. Electric iron 4. Hammer

  1. a - 1, b - 4, c - 3, d - 2

  2. a - 3, b - 4, c - 1, d - 2

  3. a - 3, b - 2, c - 4, d - 1

  4. a - 3, b - 1, c - 4, d - 2

  5. None of these

Show answer
Correct Option: B
Explanation:

Yes, it is correct as all are matched correctly. 

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