Quiz  /  Moving Coil Galvanometer Class 12 MCQ Questions With Answers

  • 1. 
    The ratio of voltage sensitivity ( V_sVs​ ) and current sensitivity ( IsI_sIs​ ) of a moving coil galvanometer is (G =conductance)

  • 1G\frac{1}{G}G1​
  • 1G2\frac{1}{G^2}G21​
  • GGG
  • G2G^2G2

  • 2. 
    In a moving coil galvanometer, the deflection of the coil θ is related to the electric current i by the relation

  • i α tanθ
  • i α θ
  • i α θ2
  • i α θ3

  • 3. 
    Galvanometer constant G

  • c/BAn
  • BAn/c

  • 4. 
    What is meant by the figure of merit of a galvanometer?

  • Maximum deflection on the galvanometer
  • Current required to produce unit deflection on the galvanometer
  • Voltage required to produce unit deflection on the galvanometer

  • 5. 
    A wire in the form of a circular loop, of one turn carrying a current, produces magnetic induction B at the centre. If the same wire is looped into a coil of two turns and carries the same current, the new value of magnetic induction at the centre is

  • B
  • 2B
  • 4B
  • 8B

  • 6. 
    In a moving coil galvanometer, the deflection of the coil Φ is related to the electric current i by the relation

  • I ∝ tanΦ
  • I ∝ Φ
  • I ∝ Φ2
  • I ∝ tan2Φ

  • 7. 
    The direction of the force on a current-carrying wire placed in a magnetic field depends on

  • the direction of the current
  • the direction of the field
  • the direction of current as well as field
  • neither the direction of current nor the direction of field

  • 8. 
    In a certain region of space, electric field E and magnetic field B are perpendicular to each other. An electron enters perpendicularly to both the fields and moves undeflected. The velocity of electron is

  • E/B
  • B/E
  • E x B
  • E.B

  • 9. 
    Currents of 10 A and 2 A are flowing in opposite directions through two parallel wires A and B respectively. If the wire A is infinitely long and wire B is 2 m long, then force on wire B which is situated at 10 cm from A, is

  • 8 x 10 ^ -5 N
  • 6 x 10 ^-5 N
  • 4 x 10 ^ -5 N
  • 2 X 10 ^ -5 N

  • 10. 
    What is the principle of Moving Coil Galvanometer.

  • Current carrying coil in an electric field experiences a force
  • Current carrying coil in magnetic field experiences no force
  • Current carrying conductor in magnetic field experiences a force
  • Current carrying conductor in an electric field produces no force

  • 11. 
    The sensitivity of a moving coil galvanometer can be increased by decreasing

  • the number of turns in the coil
  • the area of the coil
  • the magnetic field
  • the restoring torque per unit twist of the suspension

  • 12. 
    A 100 turns coil shown in the figure carries a current of 2 A in a magnetic field of .2Wbm2 The torque acting on the coil is

  • 0.32 N-m tending to rotate the side AC into the page
  • 0.32 N-m tending to rotate the side AC out of the page
  • 0.64 N-m tending to rotate the side AC into the page
  • 0.64 N-m tending to rotate the side AC out of the page

  • 13. 
    A galvanometer of 50 Ω gives full scale deflection with 2mA current. To convert it into ammeter, the range of 10 A is connected with it. What is the required value of shunt?

  • 0.1 Ω
  • 0.2 Ω
  • 0.01 Ω
  • 0.02 Ω

  • 14. 
    Current sensitivity of a galvanometer can be increased by decreasing :

  • Magnetic field B
  • number of turns N
  • torsional constant K
  • Area A
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