Grade 10 : Science - 12. Magnetic Effects (Set 1)

Question 1

What is defined as the region around a magnet or a current-carrying conductor where its magnetic influence can be detected?

Accepted Answer

B) Magnetic field

Answer

A) Electric field

Answer

C) Gravitational field

Answer

D) Electromagnetic spectrum

Question 2

Which instrument is commonly used to detect the presence and direction of a magnetic field?

Accepted Answer

C) Compass needle

Answer

A) Ammeter

Answer

B) Voltmeter

Answer

D) Galvanometer

Question 3

What is the conventional direction of magnetic field lines outside a bar magnet?

Accepted Answer

B) From North pole to South pole

Answer

A) From South pole to North pole

Answer

C) Parallel to each other

Answer

D) From East to West

Question 4

In which region are the magnetic field lines most concentrated (crowded) around a bar magnet?

Accepted Answer

B) Near the poles of the magnet

Answer

A) At the center of the magnet

Answer

C) Equidistant from both poles

Answer

D) Far away from the magnet

Question 5

Which rule helps to determine the direction of the magnetic field produced by a current-carrying straight conductor?

Accepted Answer

C) Right-Hand Thumb Rule

Answer

A) Fleming's Left-Hand Rule

Answer

B) Fleming's Right-Hand Rule

Answer

D) Lenz's Law

Question 6

What is the SI unit of magnetic field strength (or magnetic flux density)?

Accepted Answer

C) Tesla (T)

Answer

A) Ampere (A)

Answer

B) Volt (V)

Answer

D) Ohm (Ω)

Question 7

A coil of many circular turns of insulated copper wire wound closely in the shape of a cylinder is known as a:

Accepted Answer

B) Solenoid

Answer

A) Capacitor

Answer

C) Resistor

Answer

D) Diode

Question 8

To increase the strength of an electromagnet, which of the following actions would be most effective?

Accepted Answer

B) Increase the number of turns in the coil.

Answer

A) Decrease the current flowing through the coil.

Answer

C) Use a core made of wood.

Answer

D) Increase the resistance of the coil.

Question 9

The working principle of an electric motor is based on:

Accepted Answer

B) The force experienced by a current-carrying conductor in a magnetic field.

Answer

A) The heating effect of electric current.

Answer

C) Electromagnetic induction.

Answer

D) The chemical effect of electric current.

Question 10

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

Accepted Answer

C) Fleming's Left-Hand Rule

Answer

A) Right-Hand Thumb Rule

Answer

B) Fleming's Right-Hand Rule

Answer

D) Ohm's Law

Question 11

The phenomenon of inducing an electric current in a coil due to relative motion between a magnet and the coil is known as:

Accepted Answer

B) Electromagnetic induction

Answer

A) Magnetic resonance

Answer

C) Electrostatic induction

Answer

D) Magnetic hysteresis

Question 12

Which of the following devices works on the principle of electromagnetic induction?

Accepted Answer

C) Electric generator

Answer

A) Electric heater

Answer

B) Electric bell

Answer

D) Electric fuse

Question 13

What is the standard frequency of Alternating Current (AC) supply used for domestic purposes in India?

Accepted Answer

C) 50 Hz

Answer

A) 220 Hz

Answer

B) 110 Hz

Answer

D) 60 Hz

Question 14

What is the primary function of an electric fuse in a household electrical circuit?

Accepted Answer

C) To protect appliances and wiring from excessive current (overloading or short-circuiting).

Answer

A) To increase the voltage of the supply.

Answer

B) To decrease the current flow for aesthetic purposes.

Answer

D) To convert AC into DC.

Question 15

In typical household electrical wiring, which color is used for the live wire?

Accepted Answer

C) Red

Answer

A) Green

Answer

B) Black

Answer

D) Blue

Question 16

In typical household electrical wiring, which color is used for the neutral wire?

Accepted Answer

B) Black

Answer

A) Red

Answer

C) Green and yellow

Answer

D) Blue

Question 17

In typical household electrical wiring, which color is used for the earth wire?

Accepted Answer

C) Green and yellow

Answer

A) Blue

Answer

B) Red

Answer

D) Black

Question 18

What is the main purpose of earthing electrical appliances?

Accepted Answer

B) To provide a safe path for fault current to flow to the ground, preventing electric shock.

Answer

A) To make them more aesthetically pleasing.

Answer

C) To reduce the power consumption of the appliance.

Answer

D) To increase the voltage supplied to the appliance.

Question 19

What electrical phenomenon occurs when the insulation of live and neutral wires wears off, causing them to directly touch each other?

Accepted Answer

B) Short-circuiting

Answer

A) Overloading

Answer

C) Induction

Answer

D) Earthing

Question 20

Which of the following is a common cause of overloading in a household electrical circuit?

Accepted Answer

A) Connecting too many high-power appliances to a single socket.

Answer

B) Using appliances with low power consumption.

Answer

C) Proper earthing of appliances.

Answer

D) Using a fuse of appropriate rating.