Magnetic Effect Of Electric Current - Practice Test, Class 10 Science - Class 10 MCQ

Speed

Energy

Direction of motion

None of these

To accelerate neutrons

Accelerate electrons

Both (a) and (b)

None of these

Form closed curves

Cannot intersect

Are crowded near poles

All of these

Reduces substantially

Does not change

Increases heavily

Vary continuously

Current carrying wire

Current carrying ring

Current carrying solenoid

Current carrying rectangular loop

Equal pole strength

unequal pole strength

Can be same or different

None of these

The field lines inside the solenoid are in the form of straight lines which indicates that the magnetic field is the same at all points inside the solenoid

The strong magnetic field produced inside the solenoid can be used to magnetise a piece of magnetic material like soft iron, when placed inside the coil

The pattern of the magnetic field associated with the solenoid is different from the pattern of the magnetic field around a bar magnet

The N- and S-poles exchange position when the direction of current through the solenoid is reversed

An electromagnet to rotate the armature

Effectively large number of turns of conducting wire in the current carrying coil

A permanent magnet to rotate the armature

A soft iron core on which the coil is wound

More at the ends than at the centre

Minimum in the middle

Same at all points

Found to increase from one end to the other

Split-ring type commutator must be used

Slip rings and brushes must be used

A stronger magnetic field has to be used

A rectangular wire loop has to be used

220V,100Hz

110V,100Hz

220V,50Hz

110V,50Hz

when the motor is switched on

when the motor is speeding up

when the motor is at maximum speed

when the motor is slowing down

Non-uniform

Circular

Uniform

None

Generator

Galvanometer

Ammeter

Motor

Mass

Speed

Velocity

Momentum

Decreases

Increases

Remain at equal distances

None of these

Soft iron

Nickel

Steel

Copper

Earthing

Use of fuse

Use of stabilizers

Use of electric meter

Fleming's right-hand rule is a simple rule to know the direction of induced current

The right-hand thumb rule is used to find the direction of magnetic fields due to current carrying conductors

The difference between the direct and alternating currents is that the direct current always flows in one direction, whereas the alternating current reverses its direction periodically

In India,the ac changes direction after every 1/50 second

From south to north

Away from north pole

From north to south

Away from the south pole