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Electricity - 1

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The potential at a point A is - 9 V, while at another point B, it is 9 V. What is the potential difference between these points?

  1. 0 V

  2. 4.5 V

  3. 9 V

  4. 18 V


Correct Option: D
Explanation:

Potential difference = VB - VA  = 9 - (- 9) = 18 V

A 0.6 C charge passes through a cross-section of a conductor in 3 s. How much current is flowing through the conductor?

  1. 1.8 A

  2. 0.2 A

  3. 5.0 A

  4. 3.6 A


Correct Option: B
Explanation:

I = q/t I = 0.6/3 = 0.2 A

Which of the following units is used for measuring electric current?

  1. Hertz

  2. Volt

  3. Metre

  4. Ampere


Correct Option: D
Explanation:

The unit used for measuring electric current is ampere (A).

A current of 0.3 A is drawn by the filament of an electric bulb for 10 minutes. How much electric charge flows through the bulb?

  1. 180 C

  2. 3 C

  3. 200 C

  4. 1.8 C


Correct Option: A
Explanation:

I = q/t 0.3 = q/(10 x 60) q = 180 C

What will happen if you join the two terminals of a 1.5 V pencil cell without connecting them through a switch or a bulb?

  1. The electric cell will catch fire and explode due to large flow of current.

  2. The cell gets drained very fast.

  3. The terminals of the cell get corroded due to large flow of electric current.

  4. All of the above


Correct Option: B
Explanation:

If you join the two terminals of a cell without connecting them through a switch or a bulb, the chemicals in the electric cell will get used up very fast.

Which of the following represents the correct relationship between volt (V), joule (J) and coulomb (C)?

  1. 1 V = 1 CJ–1

  2. 1 V = 1 JC

  3. 1 V = 1 JC–1

  4. 1 V = 1 J–1C–1


Correct Option: C
Explanation:

V = W/Q V = JC-1 So, 1 V = 1 JC-1

If X amperes of current flows for Y seconds through a conductor, how much charge (in coulombs) passes through that conductor?

  1. X/Y

  2. Y/X

  3. XY

  4. 1/XY


Correct Option: C
Explanation:

I = q/t X = q/Y q = XY coulombs

The current across a cross-section of a wire said to be 1 A when

  1. 1 J of work is done in moving a unit charge from one position to another

  2. 1 C of charge flows across the cross-section of the wire per minute

  3. 1 C of charge flows across the cross-section of the wire having a potential difference of 1 volt across it

  4. 1 C of charge flows across the cross-section of the wire per second


Correct Option: D
Explanation:

Option (4) is correct.

Two bulbs are connected in series to a constant voltage supply. If more bulbs are connected in series, then the total brightness

  1. increases

  2. first increases then decreases

  3. remains the same

  4. decreases


Correct Option: D
Explanation:

When more and more bulbs are added in series, the total brightness decreases.

Which of the following statements is/are correct for the movement of electrons between two points?

  1. There should be a temperature difference between the two points.

  2. There should be a potential difference between the two points.

  3. Both the points must be at the same potential.

  4. Both (1) and (2)


Correct Option: B
Explanation:

There should be a potential difference between the two points.

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