CBSE Questions for Class 10 Physics Magnetic Effects Of Electric Current Quiz 6 - MCQExams.com

Magnetic field lines
  • Cannot interest at all
  • Intersect at infinity
  • Intersect within the magnet
  • Intersect at the neutral points
Magnetic lines of force inside a bar magnet
  • Are from north pole to south pole of the magnet
  • Do not exist
  • Depend upon the area of cross section of the bar magnet
  • Are from south pole to north pole of the magnet
A wire is placed between the poles of two fixed bar magnets as shown. A small current in the wire is into the plane of the paper. The direction of the magnetic force on the wire is
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  • $$\uparrow$$
  • $$\downarrow$$
  • $$\rightarrow$$
  • $$\leftarrow$$
  • $$\odot$$ out of the plane of the paper.
Which of the following figures represents the magnetic lines of force due to an isolated south pole?
Which of the following statements is INCORRECT?
  • Electric current is a scalar quantity.
  • Electric lines of force are closed curves.
  • Magnetic lines of induction are closed curves.
  • Changing magnetic field induces an electric current in a coil.
Which one of the following statements is true?
  • A motor works on the principle of electromagnetic induction
  • An electric motor converts mechanical energy into electrical energy
  • AC generator has slip rings while DC generator has a commutator
  • An electric generator converts electrical energy into mechanical energy
The direction of magnetic field line in case of a bar magnet at point A & B are
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  • $$\leftarrow$$ at A and $$\rightarrow$$ at B
  • $$\leftarrow$$ at A and $$\leftarrow$$ at B
  • $$\rightarrow$$ at A and $$\rightarrow$$ at B
  • $$\rightarrow$$ at A and $$\leftarrow$$ at B
The magnetic field lines in the middle of the current-carrying solenoid are.
  • spirals
  • circles
  • perpendicular to the axis of the tube
  • parallel to the axis of the tube
In a current-carrying solenoid, the magnetic field direction is given by the right hand rule such that the
  • Encircling fingers indicate the direction of electric current
  • Encircling fingers indicate the direction of magnetic field
  • Extended right thumb will point in the direction of the axial magnetic field
  • Both $$(B)$$ and $$(C)$$
Which of the following figures represents the magnetic lines of force due to an isolated north pole?
In a circular current-carrying conductor, if the current flows in the clockwise direction, the magnetic field direction is __________.
  • Parallel to the coil towards the observer
  • Perpendicular to the plane of the coil away from the observer
  • Perpendicular to the plane of the coil towards the observer
  • Parallel to the plane of the coil away from the observer
The unit in which we pay the cost of electricity is _____.
  • kilowatt hour
  • watt hour
  • joules
  • ergs
A solenoid is_____
  • an electromagnet
  • a temporary magnet
  • a permanent magnet
  • Both 1 and 2
Consider an experiment where Electric current is flowing in a wire. It is observed that clockwise magnetic field is produced around the wire. A teacher decides to reverse the direction of source battery which results in reversal of electrical current. What will be the effect on magnetic field?
  • Magnetic field disappears
  • Direction of field lines reverse
  • Field lines changes direction to parallel to wire
  • None of the above
The basic principle of working of motors is
  • Electromagnetic Induction
  • Force on current carrying conductor.
  • Electrostatic Force
  • Heating effect of electric current
Consider a current carrying coil placed in a magnetic field. What are the requirements for induced current to flow as per electromagnetic induction.
  • Coil of wire carrying current
  • Change in magnetic field associated with the coil
  • Both A and B
  • None
Why are multiple fuses used in domestic electric circuit
  • Failure of one of the fuses allow system to continue working in applications where fault has not ocured
  • It increases efficiency of system
  • It guarantees system will always work perfectly
  • All of the above
All power entering a house enters via
  • Electricity Meter
  • Various loads in house
  • Electricity board motor
  • Potential Barrier
What is a commutator?
  • A device that reverses the direction of flow of current through a circuit is called a commutator.
  • A device that flows in the direction of flow of current through a circuit is called a commutator.
  • A device that reverses the direction of flow of voltage through a circuit is called a commutator.
  • All
Which one of the following statement is not correct about the magnetic field?
  • Inside the magnet the linesgo from north pole to south pole of the magnet
  • Tangents, to the magnetic lines give the direction of the magnetic field
  • The magnetic lines form a closed loop
  • Magnetic lines of force do not cut each other
The simplest type of AC voltage or current is the one which
  • Varies exponentially
  • Varies sinusoidally
  • Varies linearly
  • Does not vary uniformly
The magnetic field lines inside a long, current carrying solenoid are nearly:
  • straight
  • circular
  • parabolic
  • elliptical
The current produced in a closed coil, where magnetic lines of force rapidly change within it is called:
  • direct current
  • alternating current
  • induced current
  • none of these
An electron enters a magnetic field at right angles to it. The direction of force acting on the electron will be
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  • To the right.
  • To the left.
  • Out of the page.
  • Into the page.
The law of electromagnetic induction has been used in the construction of
  • Generator
  • Electric motor
  • Galvanometer
  • None of these
Why the current produced by the generator is  called an alternating current?
  • continuous decrease and increase of current occurs.
  • after every half cycle direction of flow of current is reversed.
  • both
  • none
When the coil and the magnet are both stationary
  • there is no deflection in the galvanometer.
  • galvanometer deflects.
  • galvanometer bursts.
  • none
The essential difference between an AC generator and a DC generator is that:
  • AC generator has an electromagnet while a DC generator has permanent magnet.
  • DC generator will generate a higher voltage.
  • AC generator will generate a higher voltage.
  • AC generator has slip rings while DC generator has a commutator.
The magnetic field inside a current carrying solenoid is:
  • uniform
  • none uniform
  • anticlockwise
  • none
Inside the magnet, the direction of field lines is from
  • north to south pole
  • south to north pole
  • depends on position on the earth
  • none
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