MDCAT XI Physics Current ELectricity Online Test-2

225

Created on July 08, 2025 By

📚 Test Details

Subject: Physics
Class: 1st year / XI
Chapter:Current Electricity
Test: 2
Book: Sindh Textbook
Total No. Of MCQs: 50 MCQs
Time Allowed: 50 Minutes

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Price: Free

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1 / 50

1. If the current through a resistor connected to voltage v is doubled,resistance

a) Will be doubled

b) Will be halved

c) Will become 4times

d) Will remain same

2 / 50

2. If a metallic wire of resistance R is stretched such that its length become double ,what will its resistance after stretching

a) R

b) 2R

c) R/2

d) 4R

3 / 50

3. A wire of resistance R is cut into 4equal parts,then these parts are joined in parallel ,what is equivalent resistance of this combination

a) R

b) R/2

c) R/4

d) R/16

e) None of these

4 / 50

4. In following I-V graph,which line shoes maximum resistance

a) Line A

b) Line B

c) Line C

d) All shows equal resistivity

5 / 50

5. Resistivity depends on

a) Size

b) Shape of material

c) Temperature

d) All of these

6 / 50

6. A girl has a wire of resistance R,if she cuts wire in 3 equal parts and then join then to form a triangle,what is equivalent resistance of this combination

a) R

b) 2R/3

c) R/6

d) 2R/9

7 / 50

7. There are n number of resistors,each of resistance R ,connected in different combinations,what is ratio of maximum resistance to minimum resistance obtained from these resistors

a) nR

b) R/n

c) n²

d) 1/n

8 / 50

8. Find equivalent resistance between A and B points

a) R

b) 3R

c) 6R

d) 12R

9 / 50

9. 2 wires ,each of resistance 10ohm ,connected in parallel ,supplied by 20V source for 3 sec,how much energy is dissipated by circuit

a) 80j

b) 160j

c) 240j

d) 480j

10 / 50

10. If a wire of length l is stretched such that its area become double,if its volume remain same,what will happen to resistance

a) It will increase 2 times

b) It will increase 4 times

c) It will decrease 2 times

d) It will decrease 4 times

11 / 50

11. Which material has the large conductivity

a) Insulators

b) Conductors

c) Pure Semiconductors

d) Doped semiconductors

12 / 50

12. A wire of length l resistance of 5ohm is further drawn such that its length become 3l,what will happen to resistance

a) 15ohm

b) 25ohm

c) 35ohm

d) 45ohm

13 / 50

13. FIND equivalent resistance between A and B points

a) 1 ohm

b) 2ohm

c) 4ohm

d) 10ohm

14 / 50

14. Ohm’s law is valid at

a) Constant current

b) Constant voltage

c) Constant temperature

d) All of these

15 / 50

15. A wire which has resistance R ,When bend to form a circle,what is equalvalent resistance between A and B points as shown in fIgure

a) 1/R

b) 2R

c) R/2

d) R/4

16 / 50

16. There are three equal resistors ,when connected in series,give equivalent resistsnce 9ohm , Suppose one of these is removed and connected in parallel with same series of others two ,what is equivalent resistance of this combination

a) 2ohm

b) 3ohm

c) 6ohm

d) 9ohm

17 / 50

17. Choose correct statements regarding series combination:

total current is equal to sum of individual current of each resistor
total voltage is equal to sum of individual voltage of each resistor
Equivalent resistance is greater than individual resistance of each resistor
Power loss decrease with increase in number of resistors

a) 1 and 3

b) 2 and 3

c) 1,3 and 4

d) 2,3 and 4

18 / 50

18. If area and cross sectional both are halved,what will happen to resistance

a) it will increase 4 times

b) it will decrease 4 times

c) it will decrease 2 times

d) it will remain same

19 / 50

19. When a resistor in connected to 10V battery and 2A current passes through it,what is power dissipation of resistor

a) 2w

b) 4w

c) 10w

d) 20w

20 / 50

20. If each half of circle shown in diagram has resistance of 20 ohm,what isequivalent resistance between A and B

a) 1 ohm

b) 5ohm

c) 10ohm

d) 20ohm

21 / 50

21. Conditions of validity of ohm’s law is/are

1.resistance should be inversly propotional to current

2.resistance should be directly propotional to voltage

3.current should be directly propotional to voltage

a) Only 1

b) Only 2

c) Only 3

d) 1, 2 and 3

22 / 50

22. What is power dissipation of a 25 Ω resistor when when connected to 30v battery

a) 8w

b) 18w

c) 36w

d) Incomplete data

23 / 50

23. what is formula of conductivity

a) conductivity =RL/A

b) conductivity =RA/L

c) conductivity =L/RA

d) conductivity =R/LA

24 / 50

24. a wire which has resistance R, it it is cut into two equal part ,and then these two parts connected in Series ,what will be equivalent resistance.

a) R

b) 2R

c) R/2

d) R/4

25 / 50

25. if a boy has 3 resistors of resistance R1=2Ω , R2=2Ω and R3=4Ω,if he wants to get equivalent resistance of 2Ω,he should connect

a) R1 and R2 in series,and then connect this combination in parallel with R3

b) R1 and R2 in parallel ,and then connect this combination in series with R3

c) R1 and R3 in parallel and then connect this combination in series with R2

d) R1 and R3 in series,and then connect this combination in parallel with R2

26 / 50

26. When a wire of resistance 5ohm is supplied by 1000V battery,how much current passes through it

a) 2000A

b) 4000A

c) 8000A

d) None of these

27 / 50

27. In parallel combination,total voltage is

a) Sum of all individual voltage of each resistor

b) Lesser than smaller voltage of resistor

c) Equal to voltage of individual resistor

d) Cant be determined

28 / 50

28. Maximum power transfer occur when

a) Rₛ > Rₗ

b) Rₗ > Rₛ

c) Rₛ = Rₗ

d) None of these

29 / 50

29. 4 resistors of resistance 2 Ω 3 Ω 4 Ω and 6 Ω are connected in series,if voltage across 2 Ω resistor is is 2v,calculate total power through circuit

a) 4w

b) 8w

c) 15w

d) 16w

30 / 50

30. Power of resistors increase with increases in no. of resistors if resistors are

a) Connected in parallel

b) Connected in series

c) Whether in series or parallel

d) Cant be determined

31 / 50

31. If ten resistors ,each of resistance n,are connected in parallel,then equivalent resistance will be

a) 10n

b) 10/n

c) n/10

d) 1/10n

32 / 50

32. When a 10A current passes through a resistance of 20ohm,how much voltage is supplied by source to resistor

a) 100V

b) 200V

c) 4000V

d) Can't be determined

33 / 50

33. Find equivalent resistsance is each resistor has resistance R=1ohm

a) 1.3

b) 2.7

c) 4.2

d) 8.3

34 / 50

34. If wire of length L and diameter d and cross sectional are A,if it is cut into four equal parts,then two of them are connected in series,what will happen to resistivity of wire

a) It will decrease 4 times

b) It will decrease 2 times

c) First it will decrease 4 times,then increase to 2 times

d) It will remain same

35 / 50

35. If four resistors ,each of resistance 4 Ω are connected in parallel,if current passing through one resistor is 2A, Calculate total power dissipation through circuit is

a) 4w

b) 16w

c) 32w

d) 64w

36 / 50

36. What is the SI unit of conductivity

a) V/A

b) A/V

c) Vm/A

d) A/Vm

37 / 50

37. We have four resistors of 1ohm,3ohm,7ohm,and 10ohm resistance, respectively are connected in parallel , when connected to a source of 10V ,when current through 1ohm resistors is 10A ,what voltage is across 7ohm resistor

a) 1V

b) 10V

c) 7V

d) 70V

38 / 50

38. With increase of temperature,conductivity of

a) Conductors will decrease and of semiconductors increase

b) Conductors will increase and of semiconductors decrease

c) Conductors and semiconductors will increase

d) Conductors and semiconductors will decrease

39 / 50

39. What is power dissipation of a 25 Ω resistor when 2A current passes through it

a) 25w

b) 50w

c) 100w

d) Incomplete data

40 / 50

40. What is resistance of bulb filament operating at 900v source and 0.5A current passes through it

a) 450ohm

b) 900ohm

c) 1800ohm

d) None of these

41 / 50

41. If area of a conductor is increased,then resistivity will

a) Increase

b) Decrease

c) Remain same

d) Cant be determined

42 / 50

42. There are 10 resistors ,first five of them each have 2ohm resistance ,are connected in series other five ,each having 5ohm resistance are connected parallel, when these two combination are connected in series,what is equivalent resistance of this combination

a) 1ohm

b) 10ohm

c) 11ohm

d) 22ohm

43 / 50

43. Cells connected in parallel

a) Increase current rating

b) Increases voltage rating

c) Increase current and voltage rating

d) Cant be determined

44 / 50

44. Three resistor R1=2ohm R2 =3ohm R3=6ohm ,are connected in parallel, when 2A current passes through 6ohm resistors,how much current passes through R2

a) 2A

b) 4A

c) 6A

d) Can't be determined

45 / 50

45. As the temperature of mercury decreased,its conductivity is

a) Increased

b) Decreased

c) Either decrease or increase depending on quantity of mercury

d) Remain same

46 / 50

46. A Wire is joined to form a closed square loop,if each part of square has resistance R/4, then what is equivalent resistance between two opposite corners of square loop

a) R

b) R/4

c) R/32

d) R/16

47 / 50

47. When 10A current for 2secs passes through a circuit which has resistance of 5ohm, how much power is supplied by source

a) 10w

b) 50w

c) 500w

d) 1000w

48 / 50

48. A uniform straight wire has resistance 36 ohm, if it is bend to form a circle ,then what is resistance R1 between C and D portion of circle made by angle of 30 degree as shown in fugure

a) 3ohm

b) 9ohm

c) 18ohm

d) 36ohm

49 / 50

49. 4 resistors,each of 4ohm resistance are initially connected is series,then connected in parallel,what is ratio of equivalent resistance of series combination to equivalent resistance of parallel combination

a) 2

b) 4

c) 8

d) 16

50 / 50

50. What happens to mercury when mercury reaches at 4.15k temperature

a) its resistivity become zero

b) its conductivity become infinite

c) its conductivity become zero

d) both a and b

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MDCAT XI Physics Current ELectricity Online Test-2

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