Ampere MCQ

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Ampere is the unit of electric current named after the French Physicist and Mathematician Andre-Marie Ampere. We would come across this unit of measurement in the concept of Current Electricity from the latest CBSE Class 12 Physics Syllabus.

Ampere is the unit used to quantify the flowing current in a system. One Ampere is hence defined as the flow of one Coulomb of charge in one second. It is denoted by the letter ‘A’. Thus,

1A = 1C/s = 1 Cs^-1

An Ampere can also be expressed as the amount of current produced by the force of one volt which acts through a resistance of one Ohms. In the area through which current flows at any given point if the charge in the moving particles increases, the Ampere value also proportionately increases.

Let us look at some multiple choice questions based on Ampere.

Class 12 Ampere MCQs

Ques. The SI Unit of current is _________.

Coulomb
Ampere
Coulomb Second
None of the above

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Ans. The correct option is B. Ampere

Explanation: Ampere is the SI Unit of electric current. One Ampere is the flow of one coulomb of charge in one second.

Ques. Electric current flow is from __________.

Positive to negative terminal
Negative to positive terminal
Both ways
None of the above

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Ans.The correct option is A. Positive to negative terminal

Explanation: Conventionally the direction of current is taken as opposite to the direction of the flow of electrons. Since electron flow from the negative terminal to the positive terminal of a battery. Therefore, The direction of the current is taken as the positive terminal to the negative terminal.

Ques. One ampere is defined as ___________

Charge passing per minute
1 coulomb of charge flowing per minute
1 coulomb of charge flowing per second
Charge per second

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Ans. The correct option is C. 1 coulomb of charge flowing per second

Explanation: One ampere is defined as the flow of one coulomb of charge in one second.

1A= 1Cs^-1

Ques. Current flowing through a circuit is 0.6 A. If the current flow for 6 minutes, what is the amount of electric charge?

216 C
360 C
60 C
36 C

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Ans. The correct option is A. 216 C

Explanation: I = 0.6 A

T = 6 min

= 6x60= 360sec

Q = Ixt

= 0.6 x 360

=216 C

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Ques. What is the charge across the cross-section of semiconductor if 2A of electric current flows for 5 minutes?

205 C
150 C
600 C
10 C

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Ans. The correct option is C. 600C

Explanation: I = 2A

t = 5 min

=5 x60

=300 s

Q = Ixt

= 2 x 300

600 C

Ques. What is number of electrons passing per second through a conductor with electric current of 1 mA flowing through it?

1.6 x 10^-16
1.6 x 10¹⁶
6.25 x 10¹⁵
6.25 x 10¹⁷

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Ans. The correct option is C. 6.25 x 10¹⁵

Explanation: I = Q/t — (1)

Here,

I = 1 mA

= 1x 10^-3 A

t = 1 sec

Total charge passing per second = Q = ne

We know from (1) that Q= I x t

ne = It

e= It/n

= 10^-3 x 1/ 1.6 x 10^-19

= 6.25 x 10¹⁵

Ques. Electric current is measured using ________.

Ammeter
Galvanometer
Potentiometer
Pressure Gauge

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Ans. The correct option is A. Ammeter

Explanation: The ammeter is the electric device used to measure the electric current flowing through a circuit.

Ques. Property of a conductor that allows current to pass through it is called ___________.

Resistance
Inductance
Conductance
Reluctance

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Ans. The correct option is C. Conductance

Explanation: Conductance is the property of a material that allows electric current to pass through it.

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Ques. Instrument that detects electric current in a circuit is called ______.

Rheostat
Wattmeter
Ammeter
Galvanometer

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Ans. The correct option is D. Galvanometer

Explanation: A galvanometer is used to detect the presence of electric current in a circuit. The ammeter measures the electric current value in a circuit.

Ques. Ohm’s Law is not applicable for ___________.

High voltage Circuits
Carbon Resistors
Circuits with low current densities
Vacuum tubes

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Ans. The correct option is D. Vacuum tubes

Explanation: A vacuum tube is a non-linear circuit whose conductivity keeps altering with temperature, current, and voltage graph. Thus the plot is not a straight line and hence it does not obey Ohm’s Law.

Ques. When electric current passes through a circuit, it produces a ___________ effect.

Luminous
Thermal
Magnetic
Chemical
All of the above

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Ans. The correct option is E. All of the above

Explanation: Electric current causes a chemical reaction when it passes through a conducting solution. This is a chemical effect of electric current. When an electric current passes through the bulb. Its filament gets heated and the bulb starts glowing. This is the heating effect and luminous effect of electric current. When electric current is passed through a circuit it produces a magnetic field around it. This is the magnetic effect of electric current.

Ques. When electric current passes through a conductor, the rise in temperature is due to ________

Release of electrons from parent atoms
Mutual collision between parent atoms
Mutual collision between conducting electrons
Collision between electrons and atoms

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Ans. The correct option is D. Collision between electrons and atoms

Explanation: The ions in the conductors vibrate when the temperature rises. When the temperature is further increased the vibrations become more vigorous in nature. This increases the number of collisions between the free electrons and the ions (atoms).

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Ampere MCQ

Class 12 Ampere MCQs

CBSE CLASS XII Related Questions

1.
A current carrying circular loop of area A produces a magnetic field \( B \) at its centre. Show that the magnetic moment of the loop is \( \frac{2BA}{\mu_0} \sqrt{\frac{A}{\pi}} \).

3.
Two point charges \( q_1 = 16 \, \mu C \) and \( q_2 = 1 \, \mu C \) are placed at points \( \vec{r}_1 = (3 \, \text{m}) \hat{i}\) and \( \vec{r}_2 = (4 \, \text{m}) \hat{j} \). Find the net electric field \( \vec{E} \) at point \( \vec{r} = (3 \, \text{m}) \hat{i} + (4 \, \text{m}) \hat{j} \).

4.
The ends of six wires, each of resistance R (= 10 \(\Omega\)) are joined as shown in the figure. The points A and B of the arrangement are connected in a circuit. Find the value of the effective resistance offered by it to the circuit.

5.
Three batteries E1, E2, and E3 of emfs and internal resistances (4 V, 2 \(\Omega\)), (2 V, 4 \(\Omega\)) and (6 V, 2 \(\Omega\)) respectively are connected as shown in the figure. Find the values of the currents passing through batteries E1, E2, and E3.

Similar Physics Concepts

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Ampere MCQ

Class 12 Ampere MCQs

CBSE CLASS XII Related Questions

1.A current carrying circular loop of area A produces a magnetic field \( B \) at its centre. Show that the magnetic moment of the loop is \( \frac{2BA}{\mu_0} \sqrt{\frac{A}{\pi}} \).

2.A rectangular glass slab ABCD (refractive index 1.5) is surrounded by a transparent liquid (refractive index 1.25) as shown in the figure. A ray of light is incident on face AB at an angle \(i\) such that it is refracted out grazing the face AD. Find the value of angle \(i\).

3.Two point charges \( q_1 = 16 \, \mu C \) and \( q_2 = 1 \, \mu C \) are placed at points \( \vec{r}_1 = (3 \, \text{m}) \hat{i}\) and \( \vec{r}_2 = (4 \, \text{m}) \hat{j} \). Find the net electric field \( \vec{E} \) at point \( \vec{r} = (3 \, \text{m}) \hat{i} + (4 \, \text{m}) \hat{j} \).

4.The ends of six wires, each of resistance R (= 10 \(\Omega\)) are joined as shown in the figure. The points A and B of the arrangement are connected in a circuit. Find the value of the effective resistance offered by it to the circuit.

5.Three batteries E1, E2, and E3 of emfs and internal resistances (4 V, 2 \(\Omega\)), (2 V, 4 \(\Omega\)) and (6 V, 2 \(\Omega\)) respectively are connected as shown in the figure. Find the values of the currents passing through batteries E1, E2, and E3.

Similar Physics Concepts

Comments

SUBSCRIBE TO OUR NEWS LETTER

1.
A current carrying circular loop of area A produces a magnetic field \( B \) at its centre. Show that the magnetic moment of the loop is \( \frac{2BA}{\mu_0} \sqrt{\frac{A}{\pi}} \).

3.
Two point charges \( q_1 = 16 \, \mu C \) and \( q_2 = 1 \, \mu C \) are placed at points \( \vec{r}_1 = (3 \, \text{m}) \hat{i}\) and \( \vec{r}_2 = (4 \, \text{m}) \hat{j} \). Find the net electric field \( \vec{E} \) at point \( \vec{r} = (3 \, \text{m}) \hat{i} + (4 \, \text{m}) \hat{j} \).

4.
The ends of six wires, each of resistance R (= 10 \(\Omega\)) are joined as shown in the figure. The points A and B of the arrangement are connected in a circuit. Find the value of the effective resistance offered by it to the circuit.

5.
Three batteries E1, E2, and E3 of emfs and internal resistances (4 V, 2 \(\Omega\)), (2 V, 4 \(\Omega\)) and (6 V, 2 \(\Omega\)) respectively are connected as shown in the figure. Find the values of the currents passing through batteries E1, E2, and E3.