Class 10 Practice Level 2 – Magnetic Effects of Electric Current – Set – 1

Total questions: 25

Which of the following statements about magnetic field lines is correct?

Topic: Magnetic Field

They start from the south pole and end at the north pole of a magnet.

They never intersect each other.

They form open loops.

Their density decreases with the increase in the strength of the magnetic field.

None

The magnetic field inside a toroid is:

Topic: Magnetic Field

Zero

Uniform

Non-uniform

Infinite

None

The strength of the magnetic field around a straight current-carrying conductor is:

Topic: Electromagnetism

Inversely proportional to the current

Directly proportional to the square of the distance from the conductor

Inversely proportional to the distance from the conductor

Independent of the distance from the conductor

None

What happens to the magnetic field if the direction of the current in the conductor is reversed?

Topic: Electromagnetism

The magnetic field direction remains the same

The magnetic field direction reverses

The magnetic field strength decreases

The magnetic field disappears

None

The force experienced by a current-carrying conductor in a magnetic field depends on:

Topic: Force on a Current-Carrying Conductor

The length of the conductor

The strength of the magnetic field

The amount of current passing through the conductor

All of the above

None

Which rule is used to determine the direction of force on a current-carrying conductor in a magnetic field?

Topic: Force on a Current-Carrying Conductor

Right Hand Thumb Rule

Fleming's Left Hand Rule

Fleming's Right Hand Rule

Ampere's Circuital Law

None

The induced emf in a coil depends on:

Topic: Electromagnetic Induction

The number of turns in the coil

The rate of change of magnetic flux

The cross-sectional area of the coil

All of the above

None

If a coil with a certain number of turns is uniformly compressed to half its original length, what happens to the induced emf when the same magnetic field is applied?

Topic: Electromagnetic Induction

The induced emf doubles

The induced emf halves

The induced emf remains the same

The induced emf becomes zero

None

Why are household appliances connected in parallel in domestic circuits?

Topic: Domestic Electric Circuits

To ensure equal voltage across all appliances

To increase the total resistance in the circuit

To make the circuit safer

To ensure that all appliances operate at different voltages

None

10.

Which type of current is typically used in domestic circuits?

Topic: Domestic Electric Circuits

Direct current (DC)

Alternating current (AC)

Pulsating DC

Steady DC

None

11.

In an electric motor, the role of the brushes is to:

Topic: Electric Motor

Provide a path for current to the armature

Reverse the direction of current in the coil

Reduce the friction in the motor

Maintain the mechanical balance

None

12.

What happens to the speed of an electric motor if the current in the coil is increased?

Topic: Electric Motor

The speed decreases

The speed increases

The speed remains the same

The motor stops

None

13.

In which of the following appliances is the principle of electromagnetic induction NOT used?

Topic: Magnetic Effects in Electric Appliances

Electric bell

Transformer

Induction cooktop

Electric generator

None

14.

How does a transformer change the voltage level in an electric circuit?

Topic: Magnetic Effects in Electric Appliances

By using resistors to drop the voltage

By changing the magnetic flux linkage between two coils

By converting AC to DC

By increasing the current flow

None

15.

The magnetic lines of force outside a bar magnet:

Topic: Magnetic Lines of Force

Are parallel to each other

Form open loops

Travel from the south pole to the north pole

Travel from the north pole to the south pole

None

16.

Which of the following correctly describes the density of magnetic field lines?

Topic: Magnetic Lines of Force

It is higher at the poles of a magnet

It is uniform throughout the magnet

It is higher in the middle of the magnet

It decreases from the center towards the poles

None

17.

The strength of the magnetic field at the center of a current-carrying circular loop is:

Topic: Current and Magnetic Field

Directly proportional to the radius of the loop

Inversely proportional to the radius of the loop

Independent of the radius of the loop

Zero

None

18.

What is the shape of the magnetic field lines around a straight current-carrying conductor?

Topic: Current and Magnetic Field

Circular

Elliptical

Straight

Square

None

19.

Which of the following is NOT an electromagnetic wave?

Topic: Electromagnetic Waves

Radio waves

Sound waves

Infrared waves

X-rays

None

20.

The frequency of an electromagnetic wave is inversely proportional to its:

Topic: Electromagnetic Waves

Speed

Wavelength

Amplitude

Intensity

None

21.

In which of the following devices is an electromagnet used to convert electrical energy into mechanical energy?

Topic: Applications of Electromagnets

Electric generator

Electric motor

Transformer

Rectifier

None

22.

What happens to the magnetic field of an electromagnet if the current through the coil is increased?

Topic: Applications of Electromagnets

It becomes weaker

It becomes stronger

It remains the same

It disappears

None

23.

Which of the following materials can be used to shield sensitive electronic equipment from external magnetic fields?

Topic: Magnetic Properties of Materials

Iron

Aluminium

Copper

Plastic

None

24.

Which of the following is a ferromagnetic material?

Topic: Magnetic Properties of Materials

Glass

Rubber

Iron

Wood

None

25.

The Earth's magnetic field resembles that of:

Topic: Earth's Magnetism

A bar magnet

A solenoid

A toroid

A circular loop

None

1 out of 25

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Class 10 Practice Level 2 – Magnetic Effects of Electric Current – Set – 1

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