3. CURRENT ELECTRICITY ( Objective Question Answer 2022 )

 


1. The speed at which the current travels in a conductor is nearly :

(A) 3 x 104 ms-1
(B) 3 x 106 ms-1
(C) 3 x 108 ms-1
(D) 3 x 1010 ms-1

Answer тЗТ A

2. The resistance of a human body is about :

(A) 12 ╬й
(B) 120 ╬й
(C) 12 K╬й
(D) 120 M╬й

Answer тЗТ C

3. The number of electrons that constitute 1 A of current is :

(A) 6.25 x 1016
(B) 6.25 x 1017
(C) 6.25 x 1018
(D) 6.25 x 1019

Answer тЗТ C

4. How many different resistances are possible with two equal resistors ?

(A) 2
(B) 3
(C) 4
(D) 5

Answer тЗТ B

5. Given three equal resistors, how many different combinations (taken all of them together) can be made ?

(A) 3
(B) 4
(C) 5
(D) 6

Answer тЗТ B

6. Specific resistance of all metals is mostly affected by :

(A) temperature
(B) pressure
(C) magnetic field
(D) volume

Answer тЗТ A

7. The example of a non-ohmic resistance is :

(A) copper wire
(B) filament lamp
(C) carbon resistor
(D) diode

Answer тЗТ D

8. The length of a conductor is halved. Its resistance will be :

(A) halved
(B) doubled
(C) unchanged
(D) quadrupled

Answer тЗТ A

9. In the above question, the conductance :

(A) halved
(B) doubled
(C) unchanged
(D) quadrupled

Answer тЗТ B

10. Siemen is the unit of :

(A) resistance
(B) conductance
(C) specific conductance
(D) None of these

Answer тЗТ B

11. Two wires of copper are of the same length but have different diameters. When they are connected in series across a battery, the heat generated is H1 When connected in parallel across the same battery, the heat generated during the same time is H2 Then :

(A) H1 = H2
(B) H1 < H2
(C) H1 > H2
(D) H1 > H2

Answer тЗТ B

12. In questions 135, when the wires are connected in series, the heat produced in the thinner wire is H1 and that in the thicker wire is H2 Then :

(A) H1 = H2
(B) H1 < H2
(C) H1 > H2
(D) H1 тЙе H2

Answer тЗТ C

13. Kirchhoff’s first and second laws for electrical circuits are consequences of :

(A) conservation of energy
(B) conservation of electrical charge and energy respectively
(C) conservation of electric charge
(D) neither conservation of energy nor electric charge

Answer тЗТ B

14. A potential difference of 10 V is applied across a conductance of 2 S. The current in the conductor will be ;

(A) 20 A
(B) 5 A
(C) 0.2 A
(D) None of these

Answer тЗТ A

15. Ohm’s law is valid when the temperature of conductor is :

(A) very low
(B) very high
(C) varying
(D) constant

Answer тЗТ D

16. The emf of a car battery is about :

(A) 2.5 V
(B) 4.5 V
(C) 8.6 V
(D) 12 V

Answer тЗТ D

17. Emf is measured in :

(A) joule
(B) joule/coulomb
(C) joule-coulombs
(D) joule/coulomb/metre

Answer тЗТ B

18. 1 kilowatt hour is commonly known as:

(A) unit
(B) 1 faraday
(C) 1 curie
(D) None of these

Answer тЗТ A

19. How many joules are equal to 1 kWh ?

(A) 3.6.x 104
(B) 3.6 x 105
(C) 3.6 x 106
(D) None of these

Answer тЗТ C

20. Two bulbs 25 W, 220 V and 100 W, 220 V are given. Which has higher resistance ?

(A) 25 W
(B) 100 W
(C) both bulbs have equal resistance
(D) resistance of bulbs can not be compared

Answer тЗТ A

21. In the following figure represents a balanced Wheatstone bridge circuit. What is the value of X ?

represents a balanced Wheatstone bridge circuit

(A) 15 ╬й
(B) 20 ╬й
(C) 25 ╬й
(D) 30 ╬й

Answer тЗТ C

22. Potentiometer measures the potential difference more accurately than a voltmeter because :

(A) It has a wire of high resistance
(B) It has a wire of low resistance
(C) It does not draw current from external circuit
(D) It draws heavy current from external circuit

Answer тЗТ C

23. The sequence of colour bands of a carbon resistance of 47 k╬й will be :

(A) yellow, violet, red
(B) yellow, violet, orange
(C) violet, yellow, orange
(D) red, red, violet

Answer тЗТ B

24. The colour code for a resistance of 35 k╬й with 5% tolerance is :

(A) Orange, green, orange and gold
(B) Red, yellow, black and gold
(C) Orange, green, orange and silver
(D) Orange, green, red and gold

Answer тЗТ D

25. In the figure, shows a wheatstone bridge circuit. Its 2 Acurrent enters A, then what is the current in the arm BC ?

current in the arm BC

(A) 3/2 A
(B) 1/2 A
(C) 2/3 A
(D) None of these

Answer тЗТ A

26. The resistivity of a conductor depends upon its :

(A) length
(B) area of cross-section
(C) resistance
(D) None of these

Answer тЗТ D

27. Internal resistance of a cell does not depend upon :

(A) electrode separation
(B) electrode material
(C) electrolyte
(D) electrolyte area

Answer тЗТ D

28. For which of the following dependence of drit velocity Vd on electric field E is ohm’s law obeyed ?

(A) vd = тИЪE
(B) vd тИЭ E
(C) vd = E2
(D) vd = constant

Answer тЗТ B

29. The voltage (V) and current (I) graph for a conductor at three different temperature T1, T2 and T3 are shown in the following figure. It follows:

graph for a conductor at three different temperature

(A) T1 > T2 > T3
(B) T1 = T2 = T3
(C) T1 < T2 < T3
(D) T1 = T2 тЙИ T3

Answer тЗТ A

30. If eight identical cells, each having an e.m.f. of 6V are connected in parallel, then the e.m.f. of the combination is :

(A) 1 V
(B) 1/8 V
(C) 48 V
(D) 6 V

Answer тЗТ D

31. Which part of the curve shown in the fig. represents the negative resistance ?

represents the negative resistance

(A) AB
(C) CD
(B) BC
(D) DE

Answer тЗТ C

Class 12th physics objective question in English

S.N Physics Objective English Medium
1. ┬аELECTRIC CHARGES AND FIELDS
2. LECTROSTATIC POTENTIAL AND CAPACITANCE
3. CURRENT ELECTRICITY
4. MOVING CHARGES AND MAGNETISM
5. MAGNETISM AND MATTER
6. ELECTROMAGNETIC INDUCTION
7. ALTERNATING CURRENT
8. ELECTROMAGNETIC WAVES
9. RAY OPTICS AND OPTICAL INSTRUMENTS
10. WAVE OPTICS
11. DUAL NATURE OF MATTER AND RADIATION
12. ATOMS
13. NUCLEI
14. SEMI CONDUCTOR ELECTRONICS┬а
15. COMMUNICATION SYSTEMS

 

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