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
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Progressive Test — Guest First Round

Current Electricity – Progressive Test

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1 / 50

1. Current electricity mainly studies what kind of electrical situation?

a) Light rays bending through transparent materials

b) Charges permanently at rest on isolated bodies

c) Magnetic poles arranged around a current-carrying wire

d) Charges moving steadily through conductors

2 / 50

2. Three identical cells, each of emf and internal resistance , are connected in series aiding to a resistor of . The current is

3 / 50

3. A rechargeable cell has emf and internal resistance . It is being charged with a current of . The terminal voltage required across it is

4 / 50

4. A metal resistor has and . The temperature rise needed to increase its resistance by is

5 / 50

5. A resistor and a resistor are connected in parallel across a source. The current through the branch is

6 / 50

6. At a junction, currents and enter, while currents and leave. The value of is

7 / 50

7. A claim says, “If , then resistance must increase whenever current increases.” The best response is that

a) current cannot increase through any resistor

b) at constant temperature, stays constant as changes

c) resistance is always current divided by potential difference

d) the claim is valid for every conductor under all operating conditions

8 / 50

8. 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) a sharper null point at the midpoint

c) no balance point; the drops aid each other

d) balance length becomes independent of source emf

9 / 50

9. 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 and II only

b) I and III only

c) I, II, and III

d) II and III only

10 / 50

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

a) changes because the galvanometer resistance controls the arm ratio

b) unchanged, since galvanometer current is zero at balance

c) requires the battery emf to become zero

d) becomes

11 / 50

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

12 / 50

12. Two resistors and are connected in series across a source. If the current is , the total power dissipated in the two resistors is

13 / 50

13. A carbon resistor has colour bands brown, black, red, and gold. Its resistance value is

a) with tolerance

b) with tolerance

c) with tolerance

d) with tolerance

14 / 50

14. Consider the following statements about limitations of Ohm's law.
I. Ohm's law applies only under constant physical conditions.
II. A diode is an example of a device with non-linear - behavior.
III. Any curved - graph through the origin still represents constant resistance.

a) I, II, and III

b) I and III only

c) II and III only

d) I and II only

15 / 50

15. Two cells have balance lengths and on the same potentiometer wire without changing the primary circuit current. The ratio of their emfs is

16 / 50

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

17 / 50

17. Use the arrangement described below.

A cell of emf and internal resistance is connected to an external resistor of . The circuit is left closed for .

The energy dissipated in the external resistor is

18 / 50

18. A wire has , , and . Its resistance is

19 / 50

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

20 / 50

20. 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) Q and R are correct

b) P and Q are correct

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

d) P, R, and S are correct

21 / 50

21. A small lamp is marked and . In this marking, refers to

a) the potential difference across each wire

b) the charge stored in the lamp

c) the resistance of the lamp in ohm

d) the energy used per unit time

22 / 50

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

23 / 50

23. In a series circuit, the voltage division relation for two resistors and connected across total voltage gives the voltage across as

24 / 50

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

a) of resistance per second

b) of charge flowing in

c) of potential difference per coulomb

d) of energy used in

25 / 50

25. 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

26 / 50

26. Two resistors and are connected in parallel across the same source. The current through compared with the current through is

a) half as large

b) four times as large

c) twice as large

d) the same

27 / 50

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

28 / 50

28. The potentiometer setup contains a wire that has resistance . It is connected in series with a resistance and a driving cell of negligible internal resistance. The potential gradient of the potentiometer wire is

29 / 50

29. A fixed number of identical cells is arranged as rows in parallel, each row containing cells in series. For maximum current through an external resistance , the battery is best arranged so that its equivalent internal resistance is approximately

a) exactly zero in all cases

b) much greater than

c) independent of and

d) equal to

30 / 50

30. The unit of mobility is

31 / 50

31. Study the table for a Wheatstone bridge.

Row	Condition	Meaning
P		Bridge is balanced
Q	Galvanometer current	Null deflection
R	All four resistances must be equal	Necessary for balance
S	Galvanometer junction potentials are equal	No potential difference across galvanometer

The unsuitable row is

a) Row Q

b) Row R

c) Row P

d) Row S

32 / 50

32. Three resistors , , and are connected in parallel across a source. The total current drawn from the source is

33 / 50

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

34 / 50

34. A cylindrical wire is replaced by another wire of the same material and same length, but with twice the radius. The resistance of the new wire is

35 / 50

35. Consider the following statements about potentiometer sensitivity.
I. A smaller potential gradient generally gives greater sensitivity.
II. A longer potentiometer wire can help obtain a smaller potential gradient for the same total voltage.
III. Greater sensitivity means the test cell must supply more current at balance.

a) I and II only

b) I and III only

c) II and III only

d) I, II, and III

36 / 50

36. A Wheatstone bridge is not balanced. The most reliable next step to find currents in its arms is to

a) ignore the galvanometer branch

b) apply Kirchhoff's rules to the actual network

c) assume the galvanometer current is zero

d) apply the balanced condition anyway

37 / 50

37. Two resistors and are connected in parallel. Their equivalent resistance is

38 / 50

38. A loop equation written for a closed path is . The negative value of obtained from this equation means

a) the resistor has become an energy source

b) the cell must be omitted from the loop equation

c) current has no assigned direction in circuit equations

d) assumed current direction is opposite to actual current

39 / 50

39. A metal wire has resistance at . If , its resistance at , using as the reference temperature, is

40 / 50

40. A metal sample has its relaxation time reduced to one-half because of increased scattering, while the applied electric field remains the same. According to , the drift speed becomes

41 / 50

41. Two identical cells are first connected in series aiding and then in parallel with the same polarity. The external resistance is very small compared with the internal resistance of each cell. The parallel connection can give a larger current mainly because

a) it makes the cells oppose each other

b) it lowers internal resistance

c) it halves the equivalent emf

d) it makes the external resistance larger

42 / 50

42. A student uses the meter bridge formula but writes while is actually in the left gap and is in the right gap. This mistake would

a) reverse the resistance ratio

b) remove the need for balance

c) make the bridge wire non-uniform

d) make always equal to

43 / 50

43. Study the table and identify the row in which the physical quantity and unit are mismatched.

Row	Quantity	SI unit
P	Resistance
Q	Resistivity
R	Conductivity
S	Current density

a) Row R

b) Row P

c) Row Q

d) Row S

44 / 50

44. For a metallic wire of number density , cross-sectional area , electron charge magnitude , and drift speed , the current is

45 / 50

45. In a loop containing two opposing cells of emfs and and a total resistance of , the current magnitude is

46 / 50

46. During a potentiometer experiment, a cell balances at when no current is drawn from it. When it is connected to an external resistance , the balance length becomes . The internal resistance of the cell is

47 / 50

47. Assertion: In a balanced Wheatstone bridge, the resistance of the galvanometer does not affect the balance condition.
Reason: At balance, the potential difference across the galvanometer is zero.

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

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

c) Assertion is false, but Reason is true

d) Assertion is true, but Reason is false

48 / 50

48. A wire of cross-sectional area has conductivity . If the electric field inside it is , the current through the wire is

49 / 50

49. Two identical cells, each of emf and internal resistance , are connected in series aiding across an external resistance . The terminal voltage across the external resistor is

50 / 50

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

a) the lamp has no conducting path when glowing

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

c) filament temperature and resistance change

d) the unit of resistance changes at high brightness

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Current Electricity Mock Test – Class 12 Physics

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