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%
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Certificate: Yes
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Progressive Test — Guest First Round

Current Electricity – Progressive Test

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Click Start Test to begin the loaded practice round.

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1 / 50

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

2 / 50

2. 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 ?

3 / 50

3. Two readings for a conductor are shown below while the conductor is kept at constant temperature.

Reading	Current	Potential difference
P
Q

The data suggest that the conductor has resistance

a) and has changing resistance

b) and is ohmic

c) and is ohmic

d) and is non-ohmic

4 / 50

4. Assertion: In a metallic conductor, electron drift velocity is opposite to the applied electric field.
Reason: The charge of an electron is negative, so the electric force on it is opposite to .

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

b) Assertion is false, but Reason is true

c) Assertion is true, but Reason is false

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

5 / 50

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

a) yellow, violet, red, gold

b) yellow, violet, orange, gold

c) green, violet, red, silver

d) yellow, grey, red, gold

6 / 50

6. 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

7 / 50

7. Study the table and identify the row with the unsuitable unit.

Row	Quantity	Unit
P	Mobility
Q	Electric field
R	Drift speed
S	Mobility

a) Row S

b) Row R

c) Row P

d) Row Q

8 / 50

8. While applying Kirchhoff's loop rule, moving through a resistor in the direction of current gives a potential change of

9 / 50

9. A cell of emf and internal resistance is connected to an external resistance . The current supplied by the cell is

10 / 50

10. 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) the whole outer surface of the wire at once

d) a cross-section normal to average flow

11 / 50

11. A current is steady when

a) current changes sign repeatedly with time

b) equal charge flows in equal times

c) charge carriers stop moving inside the wire

d) zero resistance throughout the wire

12 / 50

12. Two resistors and are connected separately across the same ideal voltage source . The power dissipated in compared with that in is

a) half as large

b) four times as large

c) the same

d) twice as large

13 / 50

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

a) infinite and zero

b) zero and zero

c) zero and infinite

d) infinite and infinite

14 / 50

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

a) of charge flowing in

b) of energy used in

c) of potential difference per coulomb

d) of resistance per second

15 / 50

15. A network has two branches in parallel. Branch P contains and in series. Branch Q contains and in series. The equivalent resistance of the whole network is

16 / 50

16. Ohm's law is not a universal law for all devices because

a) all circuit elements must pass through the origin on a graph

b) some devices have non-linear - characteristics

c) every material has exactly constant resistance at all temperatures

d) current and potential difference have the same unit

17 / 50

17. The colour bands brown, green, black, and gold correspond to a resistor value of

a) with tolerance

b) with tolerance

c) with tolerance

d) with tolerance

18 / 50

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

a) its resistivity becomes zero at the balance point

b) the galvanometer current is always maximum

c) resistance is proportional to length

d) its resistance is independent of length

19 / 50

19. During a potentiometer experiment, no balance point is obtained on the wire for a given test cell. A likely reason is that

a) full-wire drop is less than test-cell emf

b) the galvanometer resistance has become exactly zero

c) the jockey is first placed at the midpoint as a rule

d) the test cell has no positive terminal

20 / 50

20. A drift-speed graph is described below for a material kept under constant physical conditions.

For a material kept at constant physical conditions, a graph is plotted with drift speed magnitude on the vertical axis and electric field magnitude on the horizontal axis. The graph is a straight line through the origin.

The slope of the graph gives

a) carrier mobility

b) resistivity

c) carrier number density

d) current density

21 / 50

21. Kirchhoff's rules are especially useful when a circuit

a) has non-reducible multiple loops

b) contains no source of emf in any loop

c) has only one resistor connected to one ideal cell

d) has no closed conducting path through any branch

22 / 50

22. A network has a resistor in series with a parallel combination of and . If enters the whole network, the current through the branch is

23 / 50

23. A lamp is used for . The electrical energy consumed is

24 / 50

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

25 / 50

25. A charge carrier in a material has drift speed magnitude when the electric field magnitude is . If the same material remains under the same physical conditions and is doubled, the drift speed magnitude becomes

26 / 50

26. 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

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 has a larger potential gradient and gives a shorter balance length

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

c) it makes the bridge wire non-uniform

d) it makes the test cell supply maximum current

28 / 50

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

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

b) Assertion is true, but Reason is false

c) Assertion is false, but Reason is true

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

29 / 50

29. Conductivity is related to resistivity by

30 / 50

30. A galvanometer of resistance gives full-scale deflection at . It is first converted into a voltmeter of range , and then the same galvanometer is converted into an ammeter of range . The required series resistance and shunt resistance are respectively closest to

a) and

b) and

c) and

d) and

31 / 50

31. 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

32 / 50

32. 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

33 / 50

33. 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 resistance, for power, for energy

c) for energy, for resistance, for power

d) for power, for energy, for resistance

34 / 50

34. 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

35 / 50

35. Study the digit assignments in the table.

Row	Colour	Digit
P	Black
Q	Brown
R	Red
S	Yellow

The row with the unsuitable digit assignment is

a) Row P

b) Row Q

c) Row R

d) Row S

36 / 50

36. A graph of on the vertical axis and on the horizontal axis passes through the origin and the point . The resistance of the conductor is

37 / 50

37. A statement says, “Resistance and resistivity are the same because both oppose current.” The best correction is that

a) resistance is a material property, while resistivity depends only on current

b) resistivity is always equal to current divided by voltage

c) resistivity is a material property; resistance also depends on and

d) resistance has unit , while resistivity has unit

38 / 50

38. The following potentiometer record is shown below.

Reading	Condition	Balance length
P	Cell open
Q	Cell connected to
R	Cell connected to

The internal resistance values inferred from Q and R are respectively

a) and

b) and

c) and

d) and

39 / 50

39. 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 current has only one route through both lamps

b) the potential difference across every lamp must be zero

c) each lamp is connected directly across the cell separately

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

40 / 50

40. The expression is needed instead of simply when

a) current is zero at only one point of the conductor

b) the conductor lacks mobile charge carriers everywhere

c) current is measured in ampere but area is unknown

d) non-uniform current density or tilted surface area

41 / 50

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

42 / 50

42. A metal wire obeys Ohm's law only while its physical conditions remain unchanged. A strong heating of the wire during measurement can make the - graph deviate from a straight line because

a) electrons become positive charge carriers

b) resistance may change with temperature

c) potential difference loses its SI unit

d) current stops being charge flow

43 / 50

43. The following drift-speed graph is described for a metal at constant temperature.

For a metal at constant temperature, a graph is plotted between drift speed magnitude on the vertical axis and electric field magnitude on the horizontal axis. The graph is a straight line through the origin.

The slope of this graph represents

44 / 50

44. 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) II and III only

b) I, II, and III

c) I and III only

d) I and II only

45 / 50

45. Use the experimental record below.

Condition	Balance length
Cell open
Cell connected across

The internal resistance of the cell is

46 / 50

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

47 / 50

47. 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 R

b) Row Q

c) Row S

d) Row P

48 / 50

48. A cylindrical wire carries a steady current . If its cross-sectional area is doubled while the same current is maintained uniformly, the magnitude of current density becomes

a) doubled

b) halved

c) four times larger

d) unchanged

49 / 50

49. 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) energy

d) current density

50 / 50

50. In the carbon resistor colour code, the first two colour bands usually represent

a) resistivity and temperature coefficient

b) the first two significant digits of resistance

c) current and potential difference in the circuit

d) tolerance and maximum power rating

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Current Electricity Mock Test – Class 12 Physics

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