Saturday, 27 November 2021

MCQ ON CURRENT ELECTRICTY WITH ANSWERS



CURRENT ELECTRICITY: 10+2 PHYSICS MCQ ON CURRENT ELECTRICTY 

Q1. Which has greater resistance ?

  • (a) Voltmeter has more resistance
  • (b) Millivoltmeter has more resistance
  • (c) Both have same resistance
  • (d) Depends on size of meter coil.

  • (b) Millivoltmeter has more resistance


Q2. To reduce the range of voltmeter, its resistance is to be reduced. A voltmeter has a resistance G and range V. What resistance connected in parallel will convert it into a voltmeter of range V/n

  • a)  nG
  • (b) (n + 1) G
  • (c)(n-1) G
  • (d) none of the above

  • (d) none of the above

Q3. The sensitivity of a galvanometer does not depend upon

  • (a) a very strong magnetic field in the permanent magnet
  • (b) the current it measures
  • (c) a very thin, weak suspension
  • (d) a large number of turns in the coil

  • (b) the current it measures

Q4. Out of  the following an ideal voltmeter is

  • (a) moving coil voltmeter
  • (b) voltameter
  • (c) an electrometer
  • (d) hot wire voltmeter

  • (c) an electrometer

Q5. The electric cell is a device to obtain

  • (a) electric charge
  • (b) electric force
  • (c) electrons
  • (d) electric energy from chemical energy


  • (d) electric energy from chemical energy


Q6. Constantan wire is used for making standard resistance, because it has

  • (a) high melting point
  • (b) low specific resistance
  • (c) high specific resistance
  • (d) negligible temperature coefficient of resistance.


  • (d) negligible temperature coefficient of resistance.


Q7. At temperature 0 K, the germanium behaves as

  • (a) conductor
  • (b) insulator
  • (c) super-conductor
  • (d) ferromagnetic


  • (b) insulator


Q8. If temperature is decreased, then relaxation time of electrons in metals will

  • (a) increase
  • (b) decrease
  • (c) fluctuate
  • (d) remains constant.


  • (a) increase

Q9. Consider the following two statements.

(A) Kirchoff's junction law follows from conservation of charge.
(B) Kirchoff's loop law follows from conservative nature of electric field.

  • (a) Both A and B are correct
  • (b) A is correct but B is wrong
  • (c) B is correct but A is wrong 
  • (d) Both A and B are wrong.

  • (b) A is correct but B is wrong


Q10. Wheatstone bridge is used to measure

  • (a) potential
  • (b) e.m.f.
  • (c) current
  • (d) resistance

  • (d) resistance

Q11. Why is the Wheatstone bridge better than the other methods of measuring

resistances ?

  • (a) It does not involve Ohm's law 
  • (b) It is based on Kirchoff's law
  • (C) It has four resistor arms
  • (d) It is a null method


  • (d) It is a null method

Q12. Suppose in an  experiment of Wheatstone's bridge, the positions of cells and galvanometer are interchanged, then balance point will

  • (a) change
  • (b) remain unchanged
  • (c) depend on the internal resistance of cell and resistance of cell and resistance of galvanometer.
  • (d) none of these.


  • (b) remain unchanged


Q13. Drift velocity is due to :

  • (a) Applied electric field over a given distance
  • (b) Random motion of electrons
  • (c) Random motion of holes
  • (d) Rcombination of holes and electrons


  • (a) Applied electric field over a given distance


Q14. Mobility is always............

  • (a) positive
  • (b) negative
  • (c) both 
  • (d) none

  • (a) positive

Q15. More is drift velocity   ......will be the current

  • (a) Less
  • (b) More
  • (c) Equal
  • (d) None.
  • (b) More


Q16. Resistance of a conductor depends directly upon :

  • (a) Pressure
  • (b) Area
  • (c) length
  • (d) None.

  • (c) length


Q17. With the increase in area of cross-section, the resistance of the conductor

  • (a) increase
  • (b) decrease
  • (c) remains same
  • (d) increase 5 times of original value.

  • (b) decrease


Q18. Resistivity of a conductor varies with temperature and

  • (a) Nature of material
  • (b) area
  • (c) length
  • (d) None

  • (a) Nature of material

Q19. Resistivity for semiconductor

  • (a) Decrease with rise in temperature 
  • (b) increase with temperature rise
  • (c) no change
  • (d) None

  • (a) Decrease with rise in temperature 


Q20. Resistance has SI unit as

  • (a) ohm meter
  • (b) ohm
  • (c) mho
  • (d) all of these

  • (b) ohm


Q21. Which of the following have +ve temperature coefficient of resistivity.

  • (a) Semiconductor
  • (b) Metals
  • (c) Alloys  
  • (d) Insulators

  • (b) Metals


Q22. What is the nature of temperature coefficient of resistivity for conductors.

  • (a) Always positive
  • (b) Always negative
  • (C) Can have positive value or negative value
  • (d) Always zero.
  • (a) Always positive


Q23. How to read colour bands on Resistors ?

  • (a) Right to left
  • (c) from both sides
  • (b) Left to Right
  • (d) All are correct.

  • (b) Left to Right


Q24.The first two bands on the resistors are ..............

  • (a) Two digits
  • (b) Decimal Multiplier
  • (c) Tolerance
  • (d) All are incorrect.

  • (a) Two digits


Q25. What colour is a 340 kΩ resistor with 5% tolerance resistive

  • (a) Orange, Yellow and Yellow with Gold
  • (b) Orange, Green and Yellow with Gold
  • (c) Orange, Blue and Orange with Gold
  • (d) Orange, Yellow and Green with Gold.

  • (a) Orange, Yellow and Yellow with Gold

Q26.It is preferable to connect bulbs in series or in parallel ?

  • (a) Series
  • (b) Parallel
  • (c) both
  • (d) None

  • (b) Parallel


Q27. Batteries are generally connected in

  • (a) Series
  • (b) Parallel
  • (c) both
  • (d) None.

  • (a) Series


Q28. The combined resistance of  12Ω   and 20Ω connected in series is

  • (a) 61Ω
  • (b) 32Ω
  • (c) 18Ω
  • (d) 41Ω

  • (b) 32Ω


Q29. S.I. unit of electro motive force (emf)  is

  • (a) Coulomb
  • (b) Ampere
  • (c) Volt
  • (d) Coulomb

  • (c) Volt


Q30. Electromotive force.........potential difference

  • (a) may be equal to
  • (b) may be greater than
  • (c) both (a) and (b)
  • (d) None of these

  • (c) both (a) and (b)


Q31. The potential difference depends on the..................flowing through conductor

  • (a) Current
  • (b) Voltage
  • (c) both
  • (d) None

  • (a) Current


Q31. Electric current is a..... ..quantity

  • (a) Scaler
  • (b) Vector
  • (C) Tensor
  • (d) None of above

  • (a) Scaler


Q32. S.I. unit of Electric current is

  • (a) Coulomb
  • (b) Ampere
  •  (c) Coulomb
  • (d) Tesla

  • (b) Ampere


Q33. Through a conductor electric current is thought to be a movement of

  • (a) ions
  • (b) orbits
  • (c) Electrons
  • (d) Protons

  • (c) Electrons


Q34. Fill in the blank : 1 Ampere =

  • (a) 3 x 10⁹ stat ampere
  • (b) 3 x 10¹⁰ stat ampere
  • (c) 3 x 10¹¹stat ampere
  • (d) 3 x 10 stat ampere

  • (a) 3 x 10⁹ stat ampere


Q35. Number of  electrons passes in one second when current is 1 Ampere

  • (a) 5.26 x 10¹⁸
  • (b) 6.25 10²⁸
  • (c) 2.96 x 10¹⁶
  • (d) 8.65 x 10⁹

  • (b) 6.25 10²⁸


Q36. If potential difference 'V' applied across conductor is increased to 3V, how will the drift velocity of electron change ?

  • (a) Drift velocity becomes tripled  
  • (b) Drift velocity becomes doubled
  • (c) Remains same
  • (d) Drift velocity becomes four times


  • (a) Drift velocity becomes tripled  ; because drift velocity is proportional to potential difference


Q37. What is mobility ?

  • (a) Ease of carrier drift
  • (b) Ease of current flow
  • (c) Ease of access to junction
  • (d) Ease of movement

  • (a) Ease of carrier drift


Q38. The relaxation time in conductors:

  • (a) Increases with increase in temperature
  • (b) Decreases with increase in temperature
  • (c) It does not depend on temperature
  • (d) may increase or decrease depends on nature of conductors

  • (b) Decreases with increase in temperature

Q39. Internal resistance depends on

  • (a) Nature of electrolyte
  • (b) Nature of electrodes
  • (c) Both (a) and (b) 
  • (d) Pressure 

  • (c) Both (a) and (b) 


Q40. To draw maximum current from a combination of cells how should the cells be grouped ?

  • (a) Series
  • (b) Parallel
  • (c) Mixed
  • (d) Depends upon the relative value of external and internal resistance.

  • (d) Depends upon the relative value of external and internal resistance


Q41. Two cells of e.m.f. 1.25 V and 0.75 V and internal resistance of 2Ω  and 12Ω  respectively are connected in series, Find the effective E.M.F.

  • (a) 2V
  • (b) 3V
  • (c) 5V
  • (d) 10V


  • (b) 3V as effective emf is = E₁ + E₂


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