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. A cell of emf and internal resistance is short-circuited.

2 / 50

2. Electric current through a wire is defined as the

a) total charge present inside the wire at one instant

b) force experienced by each free electron in the wire

c) energy supplied by the cell per unit charge

d) rate at which charge flows through a cross-section

3 / 50

3. Use the arrangement described below.

Three resistors , , and are connected in series across a battery of voltage . The battery has negligible internal resistance.

The potential differences across , , and are in the ratio

4 / 50

4. 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

5 / 50

5. 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

6 / 50

6. Two cells balance at and on the same potentiometer wire. If the emf of the first cell is , the emf of the second cell is

7 / 50

7. The ideal resistance of an ammeter and an ideal voltmeter should respectively be

a) zero and zero

b) infinite and zero

c) zero and infinite

d) infinite and infinite

8 / 50

8. A cell has emf and internal resistance . When it supplies current to an external circuit, its terminal potential difference is

9 / 50

9. In applying Kirchhoff's loop rule to a circuit containing several resistors and cells, the algebraic signs of the terms are decided by

a) the physical size of the circuit elements

b) the colour of connecting wires

c) the order in which resistances are written in the textbook

d) the chosen loop direction and assumed current directions

10 / 50

10. The pair that best represents one current-electricity example and one electrostatics example, respectively, is

a) open switch in a dead circuit; isolated neutral rod

b) isolated charged sphere; charged comb attracting paper bits

c) charged comb attracting paper bits; torch bulb glowing

d) torch bulb glowing; charged comb attracting paper bits

11 / 50

11. Study the table for wires made of the same material.

Case	Length	Area
P
Q
R
S

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

a) Q and S only

b) R and S only

c) Q and R only

d) Q, R, and S

12 / 50

12. The unit of mobility is

13 / 50

13. 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

14 / 50

14. 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

15 / 50

15. 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

16 / 50

16. Compare the two current-voltage 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

17 / 50

17. In choosing a material for a standard resistance coil, an alloy is often preferred because it usually has

a) very low resistivity and very large temperature coefficient

b) zero resistivity at room temperature

c) negative resistance at all ordinary temperatures

d) high resistivity with a small temperature coefficient

18 / 50

18. In reducing a mixed resistor network, the first safe step is usually to

a) assume every resistor carries the same current

b) assume every resistor has the same voltage

c) add all resistances directly

d) identify true series and parallel groups

19 / 50

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

a) half as large

b) twice as large

c) unchanged

d) four times as large

20 / 50

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

21 / 50

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

The physical circuit represented by this equation is most directly

a) an current source with two resistors in parallel

b) two opposing cells of and in one loop

c) an source with and in series

d) a junction where of charge is stored

22 / 50

22. A metallic conductor is carrying a steady current. Its macroscopic neutrality means that

a) only positive ions carry the current through the metal

b) electrons stop drifting once current begins

c) the conductor has no mobile conduction electrons

d) lattice and electron charges balance overall

23 / 50

23. The SI unit of current density is

24 / 50

24. When a potentiometer and a voltmeter are used to measure the same cell, the potentiometer reading corresponds to a larger value because

a) voltmeter makes the cell's emf become zero

b) potentiometer has null current; voltmeter draws current

c) potentiometer always adds its own emf to the measured cell

d) voltmeter measures resistance instead of potential difference

25 / 50

25. Study the table and identify the row that gives an unsuitable potentiometer conclusion.

Row	Observation	Conclusion
P	Longer balance length on the same wire	Larger balanced potential difference
Q	No current through galvanometer at balance	Null condition is reached
R	Smaller potential gradient	Greater sensitivity, if balance remains on the wire
S	Loaded balance length greater than open-circuit balance length for a real discharging cell	Normal effect of internal resistance

a) Row R

b) Row S

c) Row P

d) Row Q

26 / 50

26. A cell of internal resistance is connected to a parallel combination of and . The power dissipated in the branch is

27 / 50

27. When a real cell is delivering current to a load, the terminal voltage is less than its emf because

a) the external resistance becomes zero

b) current flows only inside the cell and not in the external circuit

c) some emf is lost across internal resistance

d) the cell stops supplying energy to charge

28 / 50

28. 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) the unit of resistance changes at high brightness

d) filament temperature and resistance change

29 / 50

29. A potentiometer wire of length has a potential gradient of . A cell balances at . If the potential gradient is reduced to , the new balance condition for the same cell is

c) no balance on the wire

30 / 50

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

31 / 50

31. A wire of cross-sectional area carries a uniform current of . The magnitude of current density is

32 / 50

32. Consider the following statements about a real cell.
I. When no current is drawn, terminal voltage equals emf.
II. During discharge, terminal voltage is less than emf by .
III. During charging, terminal voltage is less than emf by .

a) I and III only

b) I and II only

c) I, II, and III

d) II and III only

33 / 50

33. For a potentiometer circuit, the driving cell in the primary circuit must have emf greater than the emf of the test cell mainly to ensure that

a) the balance point always lies exactly at

b) the galvanometer resistance becomes zero

c) full wire can provide the balancing potential drop

d) the test cell is short-circuited

34 / 50

34. 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-2, Q-1, R-3, S-4

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

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

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

35 / 50

35. 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) Q and R only

b) P and Q only

c) R and S only

d) P and S only

36 / 50

36. A cell gives terminal potential difference when no current is drawn. When a current of is drawn, the terminal potential difference becomes . The internal resistance of the cell is

37 / 50

37. For a metallic conductor, resistance generally increases when temperature rises because

a) the number of positive ions moving through the wire increases greatly

b) resistivity becomes independent of material at high temperature

c) increased lattice vibrations produce stronger electron scattering

d) electrons lose their negative charge at high temperature

38 / 50

38. A resistor obeys Ohm's law and has . When the current through it is increased from to at constant temperature, the increase in potential difference is

39 / 50

39. A beginner writes , , and beside three circuit quantities: power, energy, and resistance. The most suitable matching is

a) for resistance, for energy, for power

b) for power, for energy, for resistance

c) for energy, for resistance, for power

d) for resistance, for power, for energy

40 / 50

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

a) the energy used per unit time

b) the potential difference across each wire

c) the resistance of the lamp in ohm

d) the charge stored in the lamp

41 / 50

41. The working principle of a potentiometer is that, for a uniform wire carrying steady current, the potential drop along the wire is

a) directly proportional to its length

b) inversely proportional to its length

c) proportional to the square of the length

d) independent of length

42 / 50

42. A student assumes a branch current from left to right and obtains after solving Kirchhoff equations. The correct interpretation is

a) the branch current is exactly zero

b) the resistance in that branch must be negative

c) , right to left

d) the loop rule cannot be applied to the circuit after solving

43 / 50

43. 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) zero conductivity behavior

c) positive temperature coefficient behavior

d) negative temperature coefficient behavior

44 / 50

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

45 / 50

45. A cell is balanced at on a potentiometer wire. The balance length for a cell on the same wire is

46 / 50

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

a) of energy used in

b) of resistance per second

c) of charge flowing in

d) of potential difference per coulomb

47 / 50

47. Study the table and identify the suitable formula choice.

Situation	Most direct power formula
P. Same current through two series resistors
Q. Same voltage across two parallel resistors
R. Rated voltage and rated current are known
S. Same voltage across two resistors	without finding

The unsuitable row is

a) Row S

b) Row P

c) Row Q

d) Row R

48 / 50

48. A current of flows in a wire of cross-sectional area . If and , the drift speed is closest to

49 / 50

49. A resistance is found using a balanced Wheatstone bridge. If , , and , with in the fourth arm corresponding to , the value of is

50 / 50

50. A current is steady when

a) equal charge flows in equal times

b) zero resistance throughout the wire

c) current changes sign repeatedly with time

d) charge carriers stop moving inside the wire

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Current Electricity Mock Test – Class 12 Physics

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Current Electricity – Progressive Test

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