CBSE Questions for Class 10 Physics Magnetic Effects Of Electric Current Quiz 4 - MCQExams.com

If the key in the arrangement is taken out (the circuit is made open) and magnetic field lines are drawn over the horizontal plane ABCD, the lines are:


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  • Concentric circles
  • Elliptical in shape
  • Straight lines parallel to each other
  • Concentric circles near the point O but of elliptical shapes as we go away from it
Particles having positive charge occasionally come with high velocity from the sky towards the earth on account of magnetic field of earth, they would be deflected towards:
  • North
  • South
  • East
  • West

The lines of force of a bar magnet are:
  • Parallel and straight
  • Concentric circles
  • Curved lines
  • Curved closed loops
The incorrect statement regarding the lines of force of the magnetic field B is:
  • magnetic intensity is a measure of lines of force passing through unit area held normal to it.
  • magnetic lines of force form a closed curve.
  • inside a magnet, its magnetic lines of force move from the north pole of a magnet towards its south pole.
  • magnetic lines of force never cut each other.
A proton is projected horizontally eastward in a uniform magnetic field, which is horizontal and southward in direction. The proton will be deflected
  • upward
  • downward
  • northward
  • southward
For a current in a long straight solenoid N- and S-poles are created at the two ends. Among the following statements, the incorrect statement is:
  • 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
State whether true or false :
Outside the magnet, the magnetic lines of forces pass from north pole to the south pole and inside the magnet, they pass from south to the north pole. 
  • True
  • False
In the arrangement shown in the figure, there are two coils wound on a non-conducting cylindrical rod. Initially, the key is not inserted. Then the key is inserted and later removed. Then :

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  • the deflection in the galvanometer remains zero throughout
  • there is a momentary deflection in the galvanometer but it dies out shortly and there is no effect when the key is removed
  • there are momentary galvanometer deflections that die out shortly, the deflections are in the same direction
  • there are momentary galvanometer deflections that die out shortly, the deflections are in opposite directions
If the forefinger shows the direction of the magnetic field and the thumb indicates the motion of the conductor, then, according to Flemings left-hand rule, what does the middle finger point at?
  • The direction of e.m.f.
  • The direction of current
  • The direction of flux
  • The direction of lines of force
Why is parallel arrangement used in domestic wiring?
  • For getting same potential difference across each electrical appliance.
  • For getting different potential difference across each electrical appliance.
  • For getting high potential difference across each electrical appliance.
  • For getting low potential difference across each electrical appliance.
A magnetic field is produced by the current passing through a long straight wire. When will the strength of the magnetic field increase?
  • When the magnitude of the current increases
  • When the distance from the wire increases
  • Both $$A$$ and$$B$$
  • None of these
Analyze the given statements and choose the correct option.

Statement 1 : When the current is represented by a straight line, the magnetic field lines will be circular.

Statement 2 : According to Fleming's left-hand rule, the direction of the force is parallel to the magnetic field.
  • Both statement 1 and statement 2 are CORRECT and statement 2 is the CORRECTexplanation of the statement 1.
  • Both statement 1 and statement 2 are CORRECT, but statement 2 is NOT THE CORRECT explanation of the statement 1.
  • Statement 1 is CORRECT, but statement 2 is INCORRECT.
  • Statement 1 is INCORRECT, but statement 2 is CORRECT.
How will crowding the wires of a solenoid, more closely together, will affect the strength of the field inside it?
  • Field strength increases
  • Field strength decreases
  • Can't be said
  • Field strength will remain unchanged 
Complete the following statements with an appropriate word / term to be filled in the blank space(s).
You are looking into a solenoid, at its S-pole, along its axis. From your view point, the direction of the current in the solenoid is _______:
  • clockwise
  • anti-clockwise
  • parallel to axis
  • perpendicular to axis
Two compass needles are placed near a current carrying wire at points P and Q as shown in the figure. What can be concluded?

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  • Their needles will not deflect.
  • Needle at P only will deflect
  • Both the needles will deflect in the same direction.
  • The needles will deflect in opposite directions
Complete the following statements with an appropriate word / term to be filled in the blank space(s).

You are looking along the axis of a solenoid, and the current from your position is clockwise. The end of the solenoid facing you is a _____ pole.
  • South
  • North
  • North and south both
  • None of these
If the index finger points towards the north and the middle finger towards the east, when using Flemings left-hand rule, what will be the direction of motion or that of the force acting on the conductor?
  • South
  • West
  • Top
  • Bottom
The frequency of A.C mains in India is
  • $$30 Hz$$
  • $$50Hz$$
  • $$60Hz$$
  • $$120Hz$$
Which arrangement is used for domestic circuits ?
  • Series
  • Parallel
  • Series and parallel both
  • None
A wire is carrying current vertically downwards. To the east of the wire, the magnetic field would be directed to
  • East
  • West
  • Into the plane of the paper
  • Out of the plane of paper
In alternating current
  • The direction of current is always positive
  • The direction of current is always negative
  • The direction of current changes constantly
  • The direction of current is either positive or negative
The wire having a green plastic covering is a:
  • Live wire
  • Neutral wire
  • Earth wire
  • None of these
State whether true or false.
Magnetic lines of force emanate from the south pole and enter into the north pole.
  • True
  • False
Magnetic lines of force can never intersect.
  • True
  • False
The magnetic lines of force due to a bar magnet are :
  • Curved lines
  • Curved closed loops
  • Concentric circles
  • Parallel and straight
Fleming's left-hand rule is used to find the direction of _______ acting on the current carrying conductor placed in a/an ________ field.
  • Force, Magnetic
  • Force , Electric
  • Torque, Magnetic
  • Torque, Electric
State whether true or false.
A magnetic field is a region around a magnet where magnetic lines of force act.
  • True
  • False
Magnetic lines of force: 
  • Always intersect.
  • Are closed curves.
  • Intersect far away from the poles
  • Do not pass through vacuum.
Various distribution circuits are connected in
  • series
  • parallel
  • series or parallel
  • nothing can be decided
A motor converts:
  • mechanical energy into electrical energy
  • mechanical energy into sound energy
  • electrical energy into mechanical energy
  • electrical energy into sound energy
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