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
