🧪 IIT JEE MCQ Quiz Hub

1. The ratio of the lengths densities masses and resistivities of two wires A and B are 1: 2 1: 2 1:1 1: 4 respectively. The ratio of their resistance are:
1:32
1:16
8:01
4:01

2. he length of a conductor is halved. Its conductance will be:
halved
unchanged
doubled
quadrupled

3. The resistances in left and right gaps of a metre bridge are 4 and 6 ohm. The balance point is obtained at
20 CM
40 cm
30 cm
25 cm

4. When cells are connected in series:
the emf increases
the PD decreases
the current capacity increases
the current capacity decreases

5. Two cells of 1.25 V and 0.75 V are connected in parallel. The effective voltage is:
0.75 V
2 V
2 V
2 V

6. Which of the following has the maximum resistance?
Voltmeter
Milivoltmeter
Ammeter
Miliammeter

7. An electric current is passed through a circuit containing two wires of the same material connected in parallel. If the lengths and radii of the wires are in the ratio of 4/3 and 2/3 then the ratio of the currents passing through the wire will be:
3
1upon 3
8 upon 9
2

8. The length of a given cylindrical wire is increased by 100%. Due to the consequent decrease in diameter the change in the resistance of the wire will be:
200%
100%
50%
300%

9. A voltmeter can be constructed from a moving coil galvanometer by:
shunting it with a high resistance
shunting it with a low resistance
connecting a high resistance in series with it
connecting a low resistance in series with it

10. Mark correct option or options.
In the absence of an electric field electrons move in straight lines between collisions
Relaxation time is of order 10-14 second
Resistivity is inversely proportional to relaxation time when number of electrons per unit volume of material remains constant
All of the above

11. To convert a galvanometer into voltmeter one should connect:
a low resistance in series with it
a high resistance in series with it
a low resistance in parallel with it
a high resistance in parallel with it

12. The resistance of the series combination of two resistances is S. When they are joined in parallel the total resistance is P. If S = nP then the minimum possible value of n is:
4
3
2
1

13. The sensitivity of a potentiometer can be increased by:
decreasing the length of potentiometer wire
increasing the length of potentiometer wire
increasing the emf of the cell used in primary circuit
all the above methods

14. For accurate measurements the resistance of a voltmeter should be:
as large as possible
equal to the resistance across which the potential difference is to be measured
as small as possible
infinity

15. A big dry cell A and a small dry cell B have the same emf. The internal resistance of A:
is greater than that of B
is equal to that of B
is less than that of B
may have any value independent of its size

16. A wire of resistance R is stretched so that its length increases by 10%. The resistance of the wire increases by:
11%
15%
21%
28%

17. Steady current flows in a metallic conductor of non-uniform cross-section. The quantity constant along the length of the conductor is:
current electric field and drift speed
drift speed only
current and drift speed
current only

18. When battery and galvanometer are interchanged in the case of Wheatstone bridge then:
if the bridge was in adjustment before interchange it will not be in adjustment after interchange
if the bridge was in adjustment before interchange it will be in adjustment after interchange
if the bridge was in adjustment before interchange it may or may not be in adjustment after interchange
all of the above

19. Two identical resistors are connected in parallel then connected in series The effective resistance are in the ratio:
1:02
2:01
1:04
4:01

20. To use a moving coil galvanometer as an ammeter one must connect:
low resistance in series with the coil
low resistance in parallel with the coil
high resistance in series with the coil
high resistance in parallel with the coil

21. Which of the following is likely to have the largest resistance?
Moving coil galvanometer
An ammeter of range 1A
A voltmeter of range 10V
A copper wire of length 1 m and diameter 3 cm

22. o convert a galvanometer into an ammeter we should connect:
a low resistance in series with it
a high resistance in series with it
a low resistance in parallel with it
a high resistance in parallel with it

23. Overloading of an electric circuit implies:
drawing of large current
connecting high resistance device
connecting a large number of electric devices in series with the power supply
none of the above

24. Two resistances are connected in parallel and a current is sent through the combination. The current divides itself:
in the inverse ratio of resistances
in the direct ratio of resistances
equally in both the resistances
in none of the above manner

25. By increasing the temperature the specific resistance of a conductor and a semiconductor:
increases for both
decreases for both
decreases for both
increases decreases respectively

26. If an ammeter is to be used in place of a voltmeter then we must connect with the ammeter a:
low resistance in parallel
high resistance in parallel
high resistance in series
low resistance in series

27. The thermistors are usually made of:
metals with low temperature coefficient of resistivity
metals with high temperature coefficient of resistivity
metal oxides with high temperature coefficient of resistivity
semiconducting materials having low temperature coefficient of resistivit

28. When cells are arranged in parallel
the current capacity decreases
the current capacity increases
the e. m. f. increases
the e. m .f. decreases

29. An ammeter of resistance 0.16 ohm is shunted with a resistance of 0.04 ohm which gives a reading of 8 A. The current in the main circuits is
40 A
20 A
16 A
24 A

30. he sequence of bands on carbon resistor is brown black brown and gold the value of resistance is either
40 or 50
105 or 95
75 or 85
145 or 155

31. A voltmeter 100 V range is of 9000 ohm resistance and another voltmeter of range 80 V has a resistance of 11000 ohms. This combination is connected across 120 V. The reading of voltmeter of 100 V range will be
54 V
44 V
66 V
56 V

32. The e.m.f. of a cell is E when connected across a resistor R the P.D. between the terminals is V. The internal resistance of the cell is given by
E - V / E
(E - V / E)R
E / E - V
(E / E - V)R

33. With a cell of e. m. f. 1.5 V the balancing point is obtained at a distance of 60 cm from one end of a potentiometer wire. Find the p.d. between the two ends of the wire if its total length is 1 m.
0.5 V
1.5 V
2.5 V
1.75 V

34. When cells are connected in series
the e.m.f. increases
the p.d. decreases
current capacity increases
the current capacity decreases

35. A cell of e. m. f. E is connected across resistance R. The potential difference between the terminals of a cell is found to be V. The internal resistance of the cell must be
(E - V) / R
(E - V) R
2(E - V) / R
2 (E - V) / R V

36. Mixed groups of cells will send the maximum current in the external circuit when total internal resistance is
less than external resistance
less than external resistance
more than external resistance
equal to external resistancezero

37. A battery of e. m. f. E and internal resistance r is being charged with current i. The terminal potential will be
E
E + ir
E - ir
id - E

38. In a closed circuit the e.m.f. and internal resistance of a battery are E and R respectively. If an external resistance R is connected to the battery the current flowing through the circuit shall be
Er / R
E / R + r
E / rR
ER / r

39. A voltmeter reading up to 1000 m V is calibrated with a potentiometer. An e. m. f. of 1.08 V is balanced across 5.4 m of the wire. The balanceing length is 4.55 m when the voltmeter reads 0.9 V. The error in the voltmeter reading is
- 0.01 V
zero
- 0.04 V
- 0.06 V

40. A voltmeter 100 V range is of 9000 ohm resistance and another voltmeter of range 80 V has a resistance of 11000 ohms. This combination is connected across 120 V.The reading of voltmeter having resistance 11000 ohm is
54 V
44 V
66 V
56 V

41. The current from the battery in the above circuit is
3.7 A
5.7 A
1.7 A
6.7 A

42. A 20 ohm resistance with an unknown resistance R in series is connected to the potentiometer arrangement having a constant current in its main circuit. If p. d. across 2 ohm resistance is balanced at 300 cm length and p. d. across R at 360 cm length then R is
6.6 ohm
3.6 ohm
3.1 ohm
3.0 ohm

43. Two identical resistors are connected in parallel then in series. The effective resistances are in the ratio
1:02
2:01
1:04
4:01

44. A bettery of e.m. f. E and in internal resistance r is being used and is supplying current i in the circuit. The terminal potential will be
E
E + ir
E - ir
ir - E

45. A voltmeter reading up to 1000 m V is calibrated with a potentiometer. An e. m. f. of 2.08 V is balanced across 8.4 m of the wire. The balancing length is 3.68 m when the voltmeter reads 0.9 V. The error in the voltmeter reading is
- 0.01 V
zero
- 0.04 V
- 0.06 V

46. A wire of resistance R is stretched so that its length increases by 10%. The resistance of the wire increases by
11%
15%
21%
28%

47. The plates of a capacitor are charged to a potential difference of V volts and then connected across a resistor. After one second the potential difference between the plates is V/3 then after 2 sec. from the start the potential difference between the plates is
2V / 3
V / 6
V / 9
V / 3

48. When the cells of different e. m. fs. and internal resistances are connected in parallels
the e. m. f. increases in comparison with that for single cell
the e. m. f. decreases in comparison with that for single cell
the current capacity increases in comparison with that for single cell
the current capacity decreases in comparison with that for single cell

49. If internal resistance of cells is large as compared to the external resistance then the cells should be connected in
series
parallel
partly in series and party in parallel
partly in series and remaining with reversed terminals.

50. The potential gradient along the length of a uniform wire is 5 V per metre. There at two points A and B on the wire which are 20 cm and 80 cm on the metre scale fitted along the wire. The p. d. between them will be
2 V
3 V
4 V
1 V

51. A circuit whose resistance is R is connected to n similar cells. If the current in the circuit is the same whether the cells are connected in series or in parallel then the internal resistance r of each cell is given by
r = (R / n)
r = nR
r = R
r = (1 / R)

52. An ammeter of resistance 0.16 ohm shunted with a resistance of 0.04 ohm gives a reading of 8 A. The current in the main circuit is
40 A
20 A
16 A
24 A