10th Standard CBSE - Science - Magnetic Effects of Electric Current

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Question - 1

The magnetic field inside a long straight solenoid-carrying current

  • A is zero
  • B decrease as we move towards its end
  • C increases a swe move towards its end
  • D is the same at all points.

Question - 2

Which of the following property of a proton can change while it moves freely in a magnetic field ?

  • A mass
  • B speed
  • C velocity
  • D momentum

Question - 3

A positively-charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is 

  • A towards south
  • B towards east
  • C downward
  • D upward

Question - 4

A rectangular coil of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each

  • A Two revolutions
  • B One revolution
  • C Half revolution
  • D One-fourth revolution

Question - 5

Which of the following correctly describes the magnetic field near a long straight wire ?

  • A The field consists of straight lines perpendicular to the wire.
  • B The field consists of straight lines Parallel to the wire.
  • C The field consists of radial lines originating from the wire.
  • D The field consists of concentric circles centred on the wire.

Question - 6

The phenomenon of electromagnetic induction is 

  • A the process of charging a body.
  • B the process of generating magnetic field due to a current passing through a coil.
  • C producing induced current in a coil due to relative motion between a magnet and the coil.
  • D the process of rotating a coil of an electric motor.

Question - 7

The device used for producing electric current is called a 

  • A generator 
  • B galvanometer
  • C ammeter
  • D motor

Question - 8

The essential difference between an AC generator and a DC generator is that

  • A AC generator has an electromagnet while a DC generator has permanent magnet.
  • B DC generator will generate a higher voltage.
  • C AC generator will generate a higher voltage
  • D AC generator has slip rings while the DC generator has a commutator.

Question - 9

At the time of short circuit, the current in the circuit

  • A reduces substantially
  • B does not change
  • C increases heavily
  • D vary continuously

Question - 10

Choose the incorrect statement from the following regarding magnetic lines of field.

  • A The direction of magnetic field at a point is taken to be the direction in which the north pole of a magnetic compass needle points.
  • B Magnetic field lines are closed curves
  • C if magnetic field lines are parallel and equidistant, they represent zero field strength
  • D Relative strength of magnetic field is shown by the degree of closeness of the field lines.
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