magnetic effects of electric current

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MCQ Science Class 10
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Science Class 10

Magnetic Effects of Electric Current

CBSE Board

Teacher Name : Rakesh
Total Questions : 25
Time Allowed : 60
Total Marks : 25

Q 1 :The magnetic lines of force
- always intersect each other
- never intersect each other
- sometimes intersect and sometimes do not intersect
- are always parallel to each other
Q 2 :A charged body at rest produces
- electric field only
- magnetic filed only
- neither electric field nor magnetic field
- both electric and magnetic fields
Q 3 :The magnetic effect of current was discovered by
- Faraday
- Henry
- Oersted
- Maxwell
Q 4 :The magnetic lines of force of a straight conductor carrying current are
- Parallel to conductor
- concentric circles
- perpendicular to conductor
- both ( b) and ( c)
Q 5 :Electromagnetic induction is involved in
- charging a body with positive charge
- producation of current by relative motion between magnet and the coil
- rotation of the coil of an electric motor
- generation of magnetic fielddue to a current - carrying solenoid
Q 6 :The direction of induced current in a circuit is given by
- Fleming's left-hand rule
- Fleming's right-hand rule
- Right-hand grip rule
- Ampere's swimming rule
Q 7 :An electric motor
- generates electric energy
- generates magnetic energy
- converts mechanical energy into electrical energy
- converts electrical energy into mechanical energy
Q 8 :Current-carrying conductor placed in a magnetic field experiences a force. The device based on this principle is
- electrical generator
- electric motor
- electric bell
- none of these
Q 9 :Which of the following is most suitable for the core of the electromagnets?
- Air
- Soft iron
- Steel
- Cu-Ni alloy
Q 10 :A current is flowing ina acircular loop of wire kept in the plane of paper in clockwise direction.The magnetic field at the centre of the loop is
- Directed downward
- zero
- inversely proportional to the radius of the loop
- both (a) and ( c)
Q 11 :Magnetic fields do not interact with
- electric charges at rest
- electric charges at motion
- permanent magnets at rest
- permanent magnets in motion
Q 12 :A positive charge projected towards East is deflected towards north by a magnetic field. The magnetic field is directed.
- towards west
- towards south
- upward
- downward
Q 13 :The force on a charged particle moving in a magnetic fileld is maximum when the angle between direction of motion and field is
- zero
- 90⁰
- 108⁰
- 45⁰
Q 14 :The magnetic field lines outside a bar magnet
- originate from the south pole and end at its north pole
- originate from the North pole and end at its East pole
- originate from the North pole and end at its South pole
- originate from the south pole and end at its West pole
Q 15 :The North pole of the earth as a magnet lies in the
- geographical south
- geographical East
- geographical West
- geographical North
Q 16 :A soft iron bar is inserted inside a current-carrying solenoid. The magnetic field inside the solenoid will
- decrease
- increase
- become zero
- remain the same
Q 17 :A current-carrying conductor is held in exaxtly vertical direction. In order to produce a clockwise magnetic field around the conductor, the current should be passed in the conductor.
- from top to bottom
- from left to right
- from bottom to top
- from right to left
Q 18 :The force exerted on a current- carrying wire placed in a magnetic field is zero when the angle between wire and the direction of magnetic field is
- 45⁰
- 60⁰
- 90⁰
- 180⁰
Q 19 :An induced emf is produced when a magnet is moved into a coil. The magnitude of induced emf does not depend on
- the speed with which the magnet is moved
- the number of turns of the coil
- the resistivity of the wire of the coil
- the strength of the magnet
Q 20 :A positive charge is moving towards a person from the front. The direction of magnetic field lines as viewed by the person will be in
- clockwise direction
- anticlockwise direction
- vertically upward direction
- vertically downward direction
Q 21 :Which of the following is the instrument that can detect the presence of electric current in a circuit?
- Galvanometer
- motor
- Ammeter
- none of these
Q 22 :The is electromagnetic induction?
- The process of charging a body
- The process of rotating a coil of an electric motor.
- Producing induced current in a coil due to relative motion between a magnet and the coil.
- The process of generating magnetic field due to a current passing through a coil.
Q 23 :Inside the magnet, the field lines moves
- form north to south
- form south to north
- away from the south pole
- away from the north pole
Q 24 :Relative strength of magnetic field at a point
- length of magnet
- thickness of magnet
- degree of closeness of the field lines
- resistance offered by the surroundings
Q 25 :The nature of magnetic filed line passing through the centre of current carrying circular loop is
- circular
- ellipse
- parabolic
- straight line

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