Question

1. What is the rate of flow of electric charges called?
(a) Electric potential
(b) electric conductance
(c) Electric current
(d) none of these
2. Which of the following is the SI Unit of Electric Current?
(a) ohm
(b) ampere
(c) volt
(d) faraday
3. Which instrument is used for measuring electric potential?
(a) Ammeter
(b) galvanometer
(c) voltmeter
(d) potentiometer
4. When one unit electric charge moves from one point to another point in an electric circuit, then the amount of work done in joules is known as?
(a) Electric current
(b) electric resistance
(c) electric conductance
(d) potential difference
5. The hindrance presented by material of conductor to the smooth passing of electric current is known as:
(a) Resistance
(b) Conductance
(c) Inductance
(d) None of these
6. The resistance of a conductor is directly proportional to:
(a) Its area of cross-section
(b) density
(c) melting point
(d) length
7. The purpose of a rheostat is:
(a) Increase the magnitude of current only
(b) Decrease the magnitude of current only
(c) Increase or decrease the magnitude of current
(d) None of these
8. Point to be kept in mind for verification of Ohm’s Law is:
(a) Ammeter and voltmeter should be connected in series
(b) Ammeter should be connected in series and voltmeter in parallel
(c) Ammeter should be connected in parallel and voltmeter in series
(d) Ammeter and voltmeter should be connected in parallel
9. When a 40V battery is connected across an unknown resistor there is a current of 100 mA in the circuit. Find the value of the resistance of the resister:
(a) 5000 Ω
(b) 800 Ω
(c) 0.8 Ω
(d) none of these
10. A battery of 6V is connected in series with resisters of 0.1 ohm , 0.15 ohm,0.2 ohm,0.25 ohm and 6 ohm. How much current would flow through the 0.3 ohm resistor?
(a) 0.895A
(b) 2.22A
(c) 1A
(d) none of these
11. A fuse wire is inserted in a?
(a) . Live wire
(b) . In the neutral wire
(c) . In the earth wire
(d) . May be connected in any line.
Do it quickly

Answer 1

1 C ) electric current
2. b) ampere
3 C) voltmeter
4 A) electirc current
5 A) resistance
6 D) length

Answer 2

Given that,

Some MCQ question,

(1). We need to find the name of the rate of flow of electric charges

We know that,

The rate of flow of electric charges is called electric current.

(c) is correct option.

(2). We need to find the SI Unit of Electric Current

We know that,

The unit of electric current is Ampere.

(b) is correct option.

(3). We need to find the instrument is used for measuring electric potential

We know that,

We use to voltmeter for measuring electric potential.

(c) is correct option.

(4). If one unit electric charge moves from one point to another point in an electric circuit

We need to find the name of the work done

We know that,

If one electric charge moves from one point to another point in an electric circuit then the work done is called the potential difference.

(d) is correct option.

(5). We need to find the name of the hindrance

When the hindrance presented by material of conductor to the smooth passing of electric current

We know that,

The hindrance is shows the resistance.

If the hindrance presented by material of conductor to the smooth passing of electric current then we can say that the resistance is present in the circuit.

(a) is correct option.

(6). We need to find the resistance of a conductor is directly proportional to

We know that,

The resistance of a conductor is directly proportional to the length and inversely proportional to the area of cross section.

Resistance depends on the material of the conductor.

(d) is correct option.

(7). We need to find the purpose of a rheostat

We know that,

The rheostat is used for adjust of the flowing current.

So, we can say that the purpose of a rheostat is Increase or decrease the magnitude of current.

(c) is correct option.

(8). We need to find the verification of ohm's law

We know that,

When ammeter is connected in series and voltmeter is connected in parallel in the circuit then the verify of ohm's law.

(b) is correct option.

(9). Given that,

Voltage = 40 V

Current = 100 mA

We need to calculate the resistance

Using ohm's law

$V=IR$

$R=\dfrac{V}{I}$

Put the value into the formula

$R=\dfrac{40}{100\times10^{-3}}$

$R=400\ \Omega$

The resistance is 400 ohm.

(d) is correct option

(10). Given that,

Voltage = 6V

Resistance 0.1 ohm, 0.15 ohm, 0.2 ohm, 0.25 ohm and 6 ohm is connected in series.

The equivalent resistance is

$R=R_{1}+R_{2}+R_{3}+R_{4}+R_{5}$

Put the value into the formula

$R=0.1+0.15+0.2+0.25+6$

$R=6.7\ \Omega$

We need to calculate the current flow through the 0.3 ohm

Using ohm's law

$I=\dfrac{V}{R}$

Put the value into the formula

$I=\dfrac{6}{0.3}$

$I=20\ A$

The current is 20 A.

(d) is correct option.

(11). We need to find a fuse wire is inserted in

We know that,

A fuse wire is inserted in live wire because it is used to safe electrical device from  short circuit.

(a) is correct option.

Hence, This is required answer.