# Class 12th Physics Chapter 3 Current Electricity Imoprtant Objective Question

Current Electricity

1. Which one of the following is the best material for making connecting wires?

(A) Nichrome

(B) Tungsten

(C) Copper

(D) Manganese

 Answer:- C

2. Fuse-wire is made of which material ?

(A) Copper

(B) Tungsten

(C) Lead-Tin Alloy

(P) Nichrome

 Answer:- A

3. Three resistors of resistance Reach are combined in various ways. Which of the following cannot be obtained ?

(A) 3R

(B) 2R/4

(C) R/3

(D) 2R/3

 Answer:- B

4. A 220 V, 1000 W Bulb is connected to a 110V supply. The power consumed by bulb will be :

(A) 750 W

(B) 500 W

(C) 250 W

(D) 1000 W

 Answer:- C

5. If on increasing the temperature, resistance decreases then it is :

(A) Superconductor

(B) Semiconductor

(C) Insulator

(D) None of these

 Answer:- B

6. The wire of an electric heater (100W,200V) is cut from middle into two equal parts. These parts are connected together in parallel and then connected to the same 200V source. The power liberated is now :

(A) 40 W

(B) 50 W

(C) 25 W

(D) 200 W

 Answer:- A

7. You are given three resistances each of one ohm. The maximum resistance that can be obtained by their combination is

(A) 1 ohm

(B) 1 / 2 ohm

(C) 2 ohm

(D) 3 Ω

 Answer:- D

8. In the figure, the equivalent resistance between ‘a’ and ‘b’ is

(A) 1 Ω

(B) 3 Ω

(C) 6 Ω

(D) None of these

 Answer:- A

9. The resistance of an ideal voltmeter is

(A) infinite

(B) zero

(C) 50000 Ω

(D)None of these

 Answer:- A

10. The resistance of an ideal ammeter is

(A) zero

(B) very small

(C) very large

(D) infinite

 Answer:- A

11. The resistance of a resistor is R. It is in series with a variable resistance. Initially both the resistance are equal. The total initial resistance is

(A) R

(B) 2R

(C) R / 2

(D) zero

 Answer:- B

12. The equivalent resistance between points A and B of the given circuit is,

(A) R

(B) R / 2

(C) 2R

(D) None of these

 Answer:- A

13. The SI unit of temperature co-efficient of resistivity is

(A) Ω mK-1

(B) K-1

(C) Ω-1

(D) Sm-1

 Answer:- B

14. If the temperature is increased by 3°C, the value of temperature co-efficient of resistivity.

(A) increases

(B) decreases

(C) remains almost the same

(D) None of these

 Answer:- C

15. The temperature of electric bulb just after it is switched on

(A) goes on increasing

(B) first decreases then decreases

(C) first decreases then increases

(D) first increases and then becomes constant

 Answer:- D

16. The heat generated by a 100W heater in 2 minutes is equal to which of the following?

(A) 4 x 103

(B) 6 x 103 J

(C) 10 x 103J

(D) 12 x 103J

 Answer:- D

17. A heater is rated as 1000W, 230V. Its resistance is

(A) 22.9 Ω

(B) 32.9 Ω

(C) 42.9 Ω

(D) 52.9 Ω

 Answer:- D

18. The resistance of a metal, when heated, goes on

(A) decreasing this

(B) increasing

(C) remaining the same

(D) becoming zero

 Answer:- B

19. The Kirchhoff’s point rule obeys the principle of conservation of

(A) energy

(B) charge

(C) momentum

(D) mass

 Answer:- B

20. The property of a circuit that converts electrical energy into thermal energy is called,

(A) resistance

(B) current

(C) voltage

(D) electromotive force

 Answer:- A

21. The cause of flow of current in a conductor is different in

(A) resistance

(B) temperature

(C) electric potential

(D) None of these

 Answer:- C

22. When a cell of emf 2V is connected in circuit, a maximum of 5A current is obtained. Its internal resistance in ohm is

(A) 0.4

(B) 10

(C) 2.5

(D) 7

 Answer:- A

23. If the resistance in a circuit at constant potential difference is halved, the heat generated will became

(A) half

(B) double

(C) four times

(D) unchanged

 Answer:- B

24. The electrical appliances in our houses are connected across supply switch in

(A) series

(B) parallel

(C) mixed grouping

(D) None of these

 Answer:- B

25. Negative charges flow from

(A) low to high potential

(B) high to low potential

(C) independent of potential where

(D) None of these

 Answer:- A

26. The current passing through a thermocouple is called

(A) Seebeck current

(B) Joule current

(C) Peltier current

(D) None of these

 Answer:- A

27. Wheatstone bridge is used to measure

(A) electromotive force

(B) current

(C) resistance

(D) charge

 Answer:- C

28. Thermo-couple is a device that converts

(A) electrical energy into thermal energy

(B) mechanical energy into thermal energy

(C) thermal energy into electrical energy

(D) None of these

 Answer:- C

29. The specific resistance of conductor increase with:

(A) increase of temperature

(B) increase of cross-sectional area

(C) decrease of the cross-sectional area

(D) decrease in length

 Answer:- A

Physics ka objective question, 12th physics objective questions and answers pdf 2021, 12th physics objective questions and answers in Hindi 2021, physics objective questions for 12th Bihar board, 12th physics objective questions and answers in Hindi 2021 pdf, physics 12th objective 2020 pdf, physics 12th objective 2021, physics important questions class 12 state board 2021, 12th Board Exam Physics Chapter 2 Electric Potential And Capacitance Objective Question, Class 12th Physics Chapter 3 Current Electricity Important Objective Question

 10TH 12TH MOBILE APP Class 10th CLICK Class 12th CLICK 10th Mobile App CLICK 12th Mobile App CLICK
 12TH BOARD SCIENCE STREAM Physics CLICK Chemistry CLICK Biology CLICK Mathematics Hindi 100 English 100 Hindi 50 English 50 CLICK

Class 12th Physics Chapter 1 Electric Charges & Fields VVI Objective Question, 12th physics mcq with answers 2021, 12th ka physics objective,12 class objective question answer, class 12  Hindi objective question, physics objective book in Hindi pdf, class 11 physics objective questions in Hindi, physics 12th objective answer 2021, physics objective questions for 12th pdf, Class 12th Physics Chapter 3 Current Electricity Imoprtant Objective Question, 12th physics objective question test, physics 12th objective optics, VVI question physics class 12 VVI objective, Cl;ass 10th Objective