Current Electricity Mock Test

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Quiz: Current Electricity – Progressive Test
Total questions: 400
Questions in this round: 50
Time allotted: 70 minutes
Pass score: 60%
Total rounds: 8
Current round: 1^st
Rounds passed: 0 / 8
Weakest rounds: None
Rounds attempted: 0

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Quiz: Current Electricity – Certificate Challenge
Total questions: 400
Questions to attempt: 100 random
Time allotted: 100 minutes
Certificate pass score: 70%
Random questions: Yes
Certificate: Yes
Retake: Until certificate earned
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Progressive Test — Guest First Round

Current Electricity – Progressive Test

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1 / 50

1. Two wires are made of the same material and have the same length. Wire has twice the cross-sectional area of wire . The resistance comparison is

2 / 50

2. The potential gradient of a potentiometer is . A cell balances at . The emf of the cell is

3 / 50

3. Two identical lamps are connected one after another in a single path with a cell and a switch. This arrangement is best described as a series path because

a) the potential difference across every lamp must be zero

b) the current has only one route through both lamps

c) the circuit can work even if the path is broken between the lamps

d) each lamp is connected directly across the cell separately

4 / 50

4. The meter bridge balances at from the left end with in the left gap and in the right gap. The value of is

5 / 50

5. The table below lists four microscopic quantities related to metallic conduction.

Row	Quantity	Meaning
P		Average time between successive collisions
Q		Acceleration magnitude of an electron between collisions
R		Drift speed magnitude
S		Direction of electron drift in a metal

The row that contains the unsuitable meaning is

a) Row R

b) Row Q

c) Row S

d) Row P

6 / 50

6. A resistor reads with tolerance. The most suitable four-band code is

a) yellow, violet, orange, gold

b) yellow, grey, red, gold

c) green, violet, red, silver

d) yellow, violet, red, gold

7 / 50

7. In a metal with no applied electric field, free electrons are best described as having

a) no motion at all

b) random thermal motion with no net drift current

c) conventional current in the direction of positive charge flow

d) only a steady drift in one direction

8 / 50

8. A series combination contains resistors , , and . Its equivalent resistance is larger than each individual resistance because

a) the reciprocal of resistance is added in series

b) the potential difference across every resistor is zero

c) the same current passes through each resistor in turn

d) the current divides equally among the resistors

9 / 50

9. A metallic wire carries conventional current along the positive -direction. For electron drift, the suitable sign-aware statement is

a) electron drift velocity is perpendicular to

b) electron drift velocity is along and is along

c) both electron drift velocity and are along

d) electron drift velocity is along and is along

10 / 50

10. A resistor is marked with the bands red, violet, yellow, and gold. The marked resistance is

11 / 50

11. A straight - graph for a conductor does not pass through the origin. The most careful conclusion is that

a) the ratio is automatically constant for all readings

b) it always represents an ideal ohmic resistor

c) its slope must be zero

d) it is not the standard ohmic-resistor graph through the origin

12 / 50

12. The potentiometer method can measure the emf of a cell more accurately than a voltmeter because the balance condition avoids

a) potential drop along the potentiometer wire

b) resistance in the primary circuit

c) use of a galvanometer

d) current through the cell being measured

13 / 50

13. Read the situation below and answer the question.

A steady stream of charge crosses a section of a wire. During every interval, exactly of charge crosses the section. The temperature and circuit conditions are unchanged during this observation.

What is the current through the wire?

14 / 50

14. Use the loop equation below for a single closed circuit:

The physical circuit represented by this equation is most directly

a) two opposing cells of and in one loop

b) an current source with two resistors in parallel

c) a junction where of charge is stored

d) an source with and in series

15 / 50

15. Compare the two resistor graphs described below.

Two ohmic resistors and have straight -versus- graphs through the origin. The line for is steeper than the line for .

The comparison of their resistances is

16 / 50

16. A Wheatstone bridge has , , and . For balance, the resistance should be

17 / 50

17. Consider the following statements about ohmic graph slopes.
I. Slope of a -versus- graph gives .
II. Slope of an -versus- graph gives .
III. A steeper -versus- line represents larger .

a) II and III only

b) I and II only

c) I and III only

d) I, II, and III

18 / 50

18. A cell has emf balance length and loaded terminal-voltage balance length . If the external resistance used is , the current drawn from the cell during the loaded measurement is

19 / 50

19. A uniform wire has , , and . If the current is , the potential difference across the wire is

20 / 50

20. For three resistors , , and connected in parallel, the equivalent resistance satisfies

21 / 50

21. Match the circuit part with its usual role in a simple closed circuit.

Part	Role
P. Cell	1. Opens or closes the conducting path
Q. Switch	2. Provides energy and maintains potential difference
R. Connecting wire	3. Offers a path for charge flow
S. Lamp	4. Converts electrical energy into light and heat

a) P-3, Q-1, R-2, S-4

b) P-2, Q-3, R-1, S-4

c) P-2, Q-1, R-3, S-4

d) P-1, Q-2, R-3, S-4

22 / 50

22. When the meter bridge reading gives , a value of very close to , the calculated becomes very large mainly because

a) the bridge wire resistance becomes zero

b) the denominator becomes very small

c) the galvanometer current must be maximum

d) the known resistance becomes infinite

23 / 50

23. Assertion: For a uniform current density normal to a cross-section, .
Reason: The dot product then becomes at every point of the section.

a) Assertion is true, but Reason is false

b) Assertion is false, but Reason is true

c) Both Assertion and Reason are true, but Reason does not explain Assertion

d) Both Assertion and Reason are true, and Reason explains Assertion

24 / 50

24. Consider the following statements about resistivity and conductivity.
I. has unit .
II. .
III. Resistivity of a material changes automatically when the wire is cut into two equal halves, even if temperature is unchanged.

a) II and III only

b) I and II only

c) I, II, and III

d) I and III only

25 / 50

25. The unit of mobility is

26 / 50

26. The meter-bridge balance point is at from the left end with unknown in the left gap and in the right gap. The value of is

27 / 50

27. A source of emf and internal resistance is connected to an external resistance . The power delivered to the external resistor is

28 / 50

28. A graph of versus for an ohmic resistor is a straight line through the origin. If the slope of the line is , the resistance is

29 / 50

29. Consider the following statements about temperature dependence of resistance.
I. For metals, is generally positive.
II. If , resistance increases when temperature rises above .
III. The relation is exact for every material at all temperatures.

a) I, II, and III

b) I and III only

c) I and II only

d) II and III only

30 / 50

30. In a balanced Wheatstone bridge with arms , , , and , the balance condition is

31 / 50

31. The unit statement means that a current of corresponds to

a) of potential difference per coulomb

b) of resistance per second

c) of charge flowing in

d) of energy used in

32 / 50

32. In a conductor carrying current, the phrase “current through a cross-section” means the charge flow counted through

a) only one free electron moving inside the metal

b) the empty space outside the conducting wire

c) a cross-section normal to average flow

d) the whole outer surface of the wire at once

33 / 50

33. A wire of resistance is cut into two equal halves. The resistance of each half is

34 / 50

34. A variable current is given in the table below.

Time interval	Current
to
to

What is the average current from to ?

35 / 50

35. A wire has resistance , length , and cross-sectional area . The resistivity of the material is

36 / 50

36. A string of decorative lamps is connected in series. If one lamp filament breaks, all lamps in that string go off because

a) the current gets divided equally among the remaining lamps

b) the circuit path becomes open

c) the source voltage becomes zero instantly

d) the resistance of every other lamp becomes zero

37 / 50

37. A m long potentiometer wire is used, and a cell balances at . If the potential difference across the full wire is uniform, the total potential drop across the wire is

38 / 50

38. A conductor has carrier mobility . The electric field is increased from to . The change in drift speed magnitude is

39 / 50

39. The table below compares four cases for a metallic wire. In every case, is unchanged.

Case	Carrier density	Area	Drift speed
P
Q
R
S

Compared with case P, the cases having the same current are

a) Q and S only

b) Q and R only

c) R and S only

d) Q, R, and S

40 / 50

40. Study the table and identify the most suitable material behavior.

Material type	Typical resistivity	Temperature coefficient behavior
P. Metal	Low	Usually positive
Q. Insulator	Very high	Behaves like an ideal metal
R. Alloy	Often higher than pure metal	Often small temperature coefficient
S. Semiconductor	Intermediate	Usually negative temperature coefficient

The fully suitable rows are

a) P, R, and S are correct

b) Q and R are correct

c) P and Q are correct

d) P, Q, R, and S are correct

41 / 50

41. Two wires and are made of the same material at the same temperature. Wire is longer and thicker than wire . The quantity that must be the same for both wires is

a) resistance

b) potential difference across them

c) current density

d) resistivity

42 / 50

42. For the graph described below, answer the question that follows.

A graph of potential difference on the vertical axis against current on the horizontal axis is a straight line through the origin. The line passes through the point .

The resistance represented by the graph is

43 / 50

43. To measure terminal potential difference while a cell supplies current to a resistor, a potentiometer is used. The null reading allows it to measure the terminal voltage without

a) allowing current through the load resistor during measurement

b) requiring a potential gradient along the wire

c) using a primary circuit with steady potential gradient

d) drawing current through the galvanometer at balance

44 / 50

44. In a straight metallic wire carrying conventional current from left to right, the vector points

a) radially outward from the wire surface

b) from left to right, along conventional current

c) perpendicular to the electric field inside the wire

d) from right to left, because electrons drift that way

45 / 50

45. A device is rated at . If it is connected to and its resistance is assumed unchanged, the power consumed is

46 / 50

46. A wire of resistance is stretched uniformly until its length becomes three times the original length. Assuming its volume remains unchanged, its new resistance is

47 / 50

47. A wire carries a current of . How much charge crosses any cross-section of the wire in ?

48 / 50

48. A has internal resistance . The maximum power it can deliver to an external resistor is

49 / 50

49. For a potentiometer internal-resistance experiment, the external resistance is increased while the cell and potentiometer setting are unchanged. The loaded balance length generally

a) becomes independent of terminal voltage

b) increases as terminal voltage approaches emf

c) becomes zero for all large

d) decreases because terminal voltage decreases

50 / 50

50. A graph is plotted for several wires of the same material with on the vertical axis and on the horizontal axis. The graph is a straight line through the origin. The slope represents

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Current Electricity Mock Test – Class 12 Physics

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Current Electricity – Progressive Test

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