Electric Current and Ohm's law Test

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Electric Current and Ohm's law Test - 4

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Weekly Quiz Competition

Question 1
1 / -0.25

The unit of current is

A
newton

B
joule

C
Ampere

D
coulomb

Solution

1. Newton is SI Unit of Force
2. Joule is SI Unit of Work Done
3. Coulomb is SI Unit of Charge
Hence, the unit of current is Ampere.
Question 2
1 / -0.25

A Wheatstone bridge ABCD is balanced with a galvanometer between the points B and D. At balance the resistance between the points B and D is :

A
Between zero and infinite

B
Infinite

C
Zero

D
None of the above

Solution

No current passes through the Galvanometer in the bridge balance condition.Therefore, the resistance between B and D is infinite.
Question 3
1 / -0.25

The instrument for the accurate measurement of the e.m.f of a cell is

A
an ammeter

B
a voltmeter

C
a slide wire bridge

D
a potentiometer
Solution
Both potentiometer and voltmeter are devices to measure potential difference.

EMF is the terminal p.d between the electrodes of a cell in open circuit, i.e., when no current is drawn from it.

Potentiometer measures the potential difference using null deflection method, where no current is drawn from the cell; whereas voltmeter needs a small current to show deflection.

So, accurate measurement of p.d is done using a potentiometer.
Question 4
1 / -0.25

Electromotive force is

A
The work done by the source in taking the charge from lower to higher potential energy

B
The work done per unit charge by the source in taking the charge from higher to lower potential energy

C
The number of charges pumped by the source from lower to higher potential energy

D
The work done per unit charge by the source in taking the charge from lower to higher potential energy
Solution
An electric field exists in the electrolyte between the positive and negative terminals of the battery.

In the external circuit, the current flows from the positive electrode to the negative electrode.

To maintain continuity, in the electrolyte, the current (positive charges) flow from the negative electrode (lower potential) to the positive electrode (higher potential).

Work done by the source in taking unit positive charge from lower to higher potential is called electromotive force.
Question 5
1 / -0.25

Drift is the random motion of the charged particles within a conductor,

A
along with a very slow net motion in the opposite direction of the field

B
along with zero motion in the direction of the field

C
along with a decelerated motion in the direction of the field

D
along with accelerated motion in the direction of the field

Solution

The electrons in a conductor have random velocities and when an electric field is applied, they suffer repeated collisions and in the process move with a small average velocity, opposite to the direction of the field. This is equivalent to positive charge flowing in the direction of the field.
Question 6
1 / -0.25

Unit of Resistivity is

A
meter ×Ampere/Volt

B
Volt ×Ampere/meter

C
Volt ×Ampere

D
Volt meter/Ampere

Solution
Question 7
1 / -0.25

Potentiometer measures the potential difference more accurately than a voltmeter, because

A
It draws a heavy current from external circuit.

B
It does not draw current from external circuit.

C
it has a wire of low resistance.

D
it has a wire of high resistance

Solution

Potentiometer measures the potential difference using null deflection method, where no current is drawn from the cell; whereas voltmeter needs a small current to show deflection. So, accurate measurement of p.d is done using a potentiometer.
Question 8
1 / -0.25

Meter Bridge is based on the principle of

A
Kirchhoff 's loop Rule

B
potentiometer

C
Wheatstone bridge

D
Kirchhoff 's node Rule

Solution

Meter bridge is the application of wheatstone ’s bridge. A Wheatstone bridge is an electrical network which is used to calculate the value of unknown resistance.
Question 9
1 / -0.25

A piece of copper and another of germanium are cooled from room temperature to 80K. The resistance

A
of each of them decreases

B
of each of them increases

C
copper increases and that of germanium decreases

D
copper decreases and that of germanium increases
Solution
Copper is a conductor and we know that for conductors, resistance is directly proprtional to temperature. Therefore on decreasing temperature resistance also decreases.

Whereas, germanium is a semiconductor and for semiconductors, resistance is inversely proportional to temperature.

So on decreasing temperature resistance increases.
Question 10
1 / -0.25

Unit of power is

A
newton

B
joule

C
watt

D
newton sec

Solution

Power is rate of doing work.P=W/t.The unit of power is J/s which is also called watt.

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Electric Current and Ohm's law Test - 4

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Electric Current and Ohm's law Test - 4

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Question 1

newton

joule

Ampere

coulomb

Solution

Question 2

Between zero and infinite

Infinite

Zero

None of the above

Solution

Question 3

an ammeter

a voltmeter

a slide wire bridge

a potentiometer

Solution

Question 4

The work done by the source in taking the charge from lower to higher potential energy

The work done per unit charge by the source in taking the charge from higher to lower potential energy

The number of charges pumped by the source from lower to higher potential energy

The work done per unit charge by the source in taking the charge from lower to higher potential energy

Solution

Question 5

along with a very slow net motion in the opposite direction of the field

along with zero motion in the direction of the field

along with a decelerated motion in the direction of the field

along with accelerated motion in the direction of the field

Solution

Question 6

meter ×Ampere/Volt

Volt ×Ampere/meter

Volt ×Ampere

Volt meter/Ampere

Solution

Question 7

It draws a heavy current from external circuit.

It does not draw current from external circuit.

it has a wire of low resistance.

it has a wire of high resistance

Solution

Question 8

Kirchhoff 's loop Rule

potentiometer

Wheatstone bridge

Kirchhoff 's node Rule

Solution

Question 9

of each of them decreases

of each of them increases

copper increases and that of germanium decreases

copper decreases and that of germanium increases

Solution

Question 10

newton

joule

watt

newton sec

Solution

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