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. A conductor has a straight-line - graph passing through the origin while its temperature is kept fixed. This graph indicates that

a) the conductor must be a perfect insulator

b) resistance is constant over the plotted range

c) current is independent of potential difference

d) resistance becomes zero at high current

2 / 50

2. A battery is formed by rows in parallel, each row containing identical cells in series. Each cell has emf and internal resistance . The equivalent emf and internal resistance of the battery are

a) and

b) and

c) and

d) and

3 / 50

3. A material is ohmic under fixed conditions. If the electric field inside it is doubled, the current density becomes

a) half as large

b) four times as large

c) twice as large

d) unchanged

4 / 50

4. Match the measuring instrument arrangement with its purpose.

Arrangement	Purpose
P. Low-resistance ammeter in series	1. Measures branch current with little current disturbance
Q. High-resistance voltmeter in parallel	2. Measures potential difference with little loading
R. Small shunt across galvanometer	3. Extends current range
S. Large resistance in series with galvanometer	4. Extends voltage range

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

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

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

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

5 / 50

5. Two resistors and are connected in parallel across a fixed voltage . The current division relation gives the current through as

6 / 50

6. The resistance-length graph described below is for wires of the same material and area.

For wires of the same material and same cross-sectional area, a graph is plotted with resistance on the vertical axis and length on the horizontal axis. The graph is a straight line through the origin.

The slope of this graph represents

7 / 50

7. A battery is made of identical parallel rows, each row containing identical cells in series. If each cell has emf and internal resistance , the current through an external resistance is

8 / 50

8. The graph described below gives voltage and current data for a device.

For a device, a point on the -versus- graph is . The graph is straight through the origin near this point.

At this operating point, the resistance and power are

a) and

b) and

c) and

d) and

9 / 50

9. For an ohmic material, the slope of an -versus- graph is . The conductivity of the material is

10 / 50

10. A thermistor made from a semiconductor is used in a temperature-sensing circuit. Its resistance falls when temperature rises. This behavior is best described as

a) constant resistivity behavior

b) negative temperature coefficient behavior

c) positive temperature coefficient behavior

d) zero conductivity behavior

11 / 50

11. Two cells of emfs and , each with internal resistance , are connected in series opposing and joined to an external resistance . The current in the circuit is

12 / 50

12. Consider the following statements about practical current-electricity applications.
I. A fuse is connected in series with the circuit it protects.
II. A heater works mainly due to Joule heating in a resistive element.
III. A voltmeter should have low resistance so that it can draw large current.

a) I and III only

b) I, II, and III

c) I and II only

d) II and III only

13 / 50

13. The efficiency of a cell delivering current to an external resistance is the ratio of useful power in to total power supplied by the cell. For internal resistance , this efficiency is

14 / 50

14. A cell with internal resistance supplies a current of . Its terminal potential difference is

15 / 50

15. In a parallel circuit, the equivalent resistance is smaller than the smallest branch resistance because

a) every branch carries the same current

b) adding branches gives extra paths for current

c) resistance values are added directly

d) voltage is divided in the inverse ratio of resistance

16 / 50

16. A resistor and a resistor are connected in series to a source. The potential difference across the resistor is

17 / 50

17. A metal has , , and . If the electron drift is opposite to , the magnitude of drift velocity is

18 / 50

18. A colour-coded resistor is held so that the gold band is at the right end. This positioning is useful because the gold band usually indicates

a) the multiplier

b) the tolerance band

c) the second significant digit

d) the first significant digit

19 / 50

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

20 / 50

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

a) electron drift velocity is along and is along

b) electron drift velocity is perpendicular to

c) both electron drift velocity and are along

d) electron drift velocity is along and is along

21 / 50

21. Read the following current-time graph description.

From to , the current through a wire increases uniformly from to . The - graph is a straight line segment.

How much charge crosses a cross-section during these ?

22 / 50

22. Kirchhoff's loop rule states that the algebraic sum of potential changes around any closed loop is zero. This rule is based on conservation of

a) charge

b) resistivity

c) current density

d) energy

23 / 50

23. A filament lamp glows brighter as the applied voltage is increased. Its - graph is not a straight line through the origin mainly because

a) filament temperature and resistance change

b) the current in the filament is not a flow of charge

c) the unit of resistance changes at high brightness

d) the lamp has no conducting path when glowing

24 / 50

24. A Wheatstone bridge is balanced. If the galvanometer is replaced by another galvanometer of different resistance, the balance condition

a) requires the battery emf to become zero

b) becomes

c) changes because the galvanometer resistance controls the arm ratio

d) unchanged, since galvanometer current is zero at balance

25 / 50

25. For a meter bridge wire of resistance and length , at balance, the jockey is at from the left end. The resistance of the left segment of the wire is

26 / 50

26. In a loop calculation, a cell of emf is crossed from its negative terminal to its positive terminal. The potential change is

27 / 50

27. The potentiometer graphs described below compare two settings.

A potentiometer is adjusted twice. In setting P, the graph of balanced potential difference versus balance length is less steep. In setting Q, the same graph is steeper. Both graphs pass through the origin.

For measuring a small emf accurately, setting P is generally more suitable because

a) it makes the bridge wire non-uniform

b) it has a smaller potential gradient and gives a longer balance length

c) it makes the test cell supply maximum current

d) it has a larger potential gradient and gives a shorter balance length

28 / 50

28. Study the table and identify the device most likely to be non-ohmic.

Row	Device or material	Expected - behavior
P	Metal resistor at constant temperature	Linear
Q	Semiconductor diode	Non-linear and direction-dependent
R	Uniform metallic wire with fixed temperature	Linear
S	Ohmic resistor used within rating	Linear

a) Row Q

b) Row S

c) Row P

d) Row R

29 / 50

29. 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

30 / 50

30. During a potentiometer setup, the test cell is accidentally connected with its polarity reversed relative to the potentiometer wire. The likely observation is

a) zero potential gradient along the wire

b) no balance point; the drops aid each other

c) a sharper null point at the midpoint

d) balance length becomes independent of source emf

31 / 50

31. 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) R and S only

b) Q and S only

c) Q, R, and S

d) Q and R only

32 / 50

32. At the potentiometer balance point, there is no deflection at the balance point even though the test cell is connected in the secondary circuit. The test cell does not get discharged at this instant because

a) the primary circuit current is zero

b) the potentiometer wire has infinite resistance

c) the secondary circuit current is zero

d) the test cell has no emf at balance

33 / 50

33. The same resistor is represented on two different graphs. One graph plots against , and the other plots against . If the resistor has resistance , the slopes of the two graphs respectively are

a) and

b) and

c) and

d) and

34 / 50

34. At a null point in a potentiometer, the jockey touches the wire at . If the jockey is moved slightly beyond this point, the galvanometer deflection reverses because

a) the primary circuit current becomes zero

b) the wire resistance becomes negative

c) the test cell emf changes sign

d) balancing drop now exceeds cell emf

35 / 50

35. In the relation , a metal is kept unchanged but the applied electric field is made three times larger. The drift speed magnitude becomes

36 / 50

36. 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

37 / 50

37. A metal wire is connected to a cell so that electrons drift from right to left through the wire. The conventional current in the same wire is directed

a) from right to left

b) from left to right

c) perpendicular to the length of the wire

d) randomly along both directions

38 / 50

38. The bridge wire in a meter bridge is usually uniform so that

a) its resistivity becomes zero at the balance point

b) resistance is proportional to length

c) the galvanometer current is always maximum

d) its resistance is independent of length

39 / 50

39. A closed loop is traversed clockwise. The chosen current in a resistor is anticlockwise and has magnitude . The potential change across the resistor during the clockwise traversal is

40 / 50

40. Assertion: For a uniform ohmic wire, the microscopic relation leads to the macroscopic relation .
Reason: In a uniform wire, , , and .

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

b) Assertion is true, but Reason is false

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

d) Assertion is false, but Reason is true

41 / 50

41. Study the table for a series circuit.

Row	Quantity	Series-circuit behavior
P	Current	Same through all resistors
Q	Potential difference	Adds across resistors
R	Equivalent resistance	Smaller than the smallest resistor
S	Voltage division	Larger resistor gets larger voltage drop

The unsuitable row is

a) Row P

b) Row S

c) Row R

d) Row Q

42 / 50

42. In solving a circuit with Kirchhoff's rules, an assumed current comes out negative after calculation. This means

a) the resistance of that branch must be negative

b) actual current is opposite to the assumed direction

c) the actual current is zero in that branch

d) Kirchhoff's loop and junction rules have become invalid

43 / 50

43. A cell is connected to a variable external resistance . The power delivered to is maximum when

44 / 50

44. A potentiometer wire of length and resistance is connected in series with a resistor and a driving cell of negligible internal resistance. A test cell balances at . The emf of the test cell is

45 / 50

45. identical cells, each of emf and internal resistance , are connected in series aiding across an external resistance . The current is

46 / 50

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

The physical circuit represented by this equation is most directly

a) an source with and in series

b) an current source with two resistors in parallel

c) a junction where of charge is stored

d) two opposing cells of and in one loop

47 / 50

47. A sample has , , and . Its conductivity is

48 / 50

48. A resistor is connected in parallel with a series combination of and . The whole network is connected across . The current through the branch is

49 / 50

49. A current of passes through a heating coil for . The heat produced is

50 / 50

50. Study the table and choose the row that matches the graph type with the slope meaning.

Row	Graph	Slope meaning for ohmic resistor
P	versus
Q	versus
R	versus
S	versus

a) P and S only

b) Q and R only

c) P and Q only

d) R and S only

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Current Electricity Mock Test – Class 12 Physics

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