XII Physics Current Electricity Online Test Mdcat-2024

Instructions for Current Electricity Online Test Mdcat-2024:

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NameEmailPhone Number

1 / 50

1. What is equivalent resistance between A and B?

a) R/3

b) 3R

c) 2/3 R

d) 3/2 R

2 / 50

2. The total equivalent resistance between these two points in the shown circuit:

a) 1 Ω

b) 3 Ω

c) 6 Ω

d) 9 Ω

3 / 50

3. What is effective resistance of this whole circuit:

a) 4 r

b) 6 r

c) 1.5 r

d) 2.5 r

4 / 50

4. Conduction electrons move to the right in a certain wire. This indicates that:

a) the current density and electric field both point right

b) the current density and electric field both point left

c) the current density points right and the electric field points left

d) the current density points left and the electric field points right

5 / 50

5. When a wire is stretched double of is length, then its resistance will be:

a) 16 R

b) 4 R

c) 2R

d) 8 R

6 / 50

6. The following four wires are made of the. same material and are at the same temperature. Which one of them has highest electrical resistance

a) length = 100 cm, diameter = l mm

b) length= 200 cm, diameter =2 mm 0.10

c) length = 50 cm, diameter = 0.5 mm

d) length=300 cm, diameter=3 mm

7 / 50

7. Fractional change in resistance per Kelvin is known as:

a) Temperature coefficient of resistance

b) Linear coefficient of expansion

c) Thermal coefficientThermal coefficient

d) Volumetric coefficient of expansion

8 / 50

8. Electrical energy is converted to heat at the rate of :

a) IRt

b) I²Rt

c) IR

d) VIt

9 / 50

9. A car battery has EMF of 12 Volts and internal resistance 5x 10^-2 ohm. If it draws 60 ampere current, then terminal voltage of the battery will be:

a) 5 volts

b) 3 volts

c) 15 volts

d) 9 volts

10 / 50

10. When the current is neither drawn from a source nor given to it:

a) E > V

b) E < V

c) E = V

d) Both A and B

11 / 50

11. ohm's law Is true:

a) For metallic conductors at low temperature

b) For metallic conductors at high temperature

c) For electrolytes when current passes through them

d) For diode when current flows

12 / 50

12. For a metallic wire, the ratio of V/I (V = the applied potential difference , I = current)

a) Independent of temperature

b) Increases as the temperature rises

c) Decreases as the temperature rises

d) Increases or decreases as temperature rises, depending upon the metal

13 / 50

13. Resistivity of a conductor depends upon:

a) Temperature

b) Nature of the material

c) Both temperature and nature of the material

d) Temperature, length and nature of the material

14 / 50

14. To increase current, batteries of different EMF are connected in:

a) Series combination

b) Parallel combination

c) Both combinations

d) Can’t be increased

15 / 50

15. The length of the wire is doubled, its conductance will

a) Remain unchanged

b) Doubled

c) Halved

d) Quadrupled

16 / 50

16. The resistance of a material increases with temperature. It is a:

a) Conductor

b) Semiconductor

c) Insulator

d) Inductor

17 / 50

17. Length of two wires of same material have ratio 2:3 and their radii have the ratio 1:2 Then the ratio of their resistances is:

a) 1:3

b) 4:3

c) 1:6

d) 8:3

18 / 50

18. Two bulbs are working in parallel order. Bulb A is brighter than bulb B. If RA and RB are their resistance respectively then:

a) RA > RB

b) RA < RB

c) RA = RB

d) Can't be defined

19 / 50

19. A 60-watt light bulb carries a current of 0.5 A. The total charge passing through it in one hour is:

a) 120 C

b) 1800 C

c) 2.4 C

d) 3600 C

20 / 50

20. When a bulb is connected with a battery it gives certain brightness after increasing potential of battery by 20% then its power dissipation will increase by:

a) 10 %

b) 21 %

c) 44 %

d) 69 %

21 / 50

21. Which of the following is the unit for the electric power delivered by the source:

a) kVA

b) kWA

c) kW

d) kVI²

22 / 50

22. A 100 W electric bulb is lighted for 2 hrs daily and four 40-watt bulbs are lighted for 4 hrs every day. Calculate the energy consumed in kWh in 30 days

a) 30 kWH

b) 28 kWH

c) 25.2 kWH

d) 32 kWH

23 / 50

23. When a wire is stretched and its radius becomes r/2, then its resistance will be

a) 0 R

b) 4 R

c) 16 R

d) 2 R

24 / 50

24. When a battery is charged then its EMF and V are related as:

a) EMF > V

b) EMF < V

c) EMF = V

d) EMF ≈ V

25 / 50

25. Which of the following substance work as internal resistor in any battery:

a) Electrolytes in battery

b) Electrodes used in battery

c) Outer covering of battery

d) Central rod in battery

26 / 50

26. When a ordinary battery is delivering current to any resistor at terminal end then its EMF and V are related as:

a) EMF > V

b) EMF < V

c) EMF = V

d) EMF ≈ V

27 / 50

27. Thermocouple converts which form of energy into electric energy:

a) Light energy

b) Heat energy

c) Wind energy

d) Mechanical energy

28 / 50

28. Which of the following is the negative temperature coefficient material:

a) Aluminium

b) Cupper

c) Silicon

d) Aluminium

29 / 50

29. In Ohm's law, which factor remains constant:

a) Volume

b) Length

c) Pressure

d) Temperature

30 / 50

30. Ohm.meter and Volt/meter respectively are the units of:

a) Resistance, Conductance

b) Resistivity, Conductivity

c) Conductivity, Electric power

d) Resistivity, Electric field

31 / 50

31. Total number of electrons present in 4-amp current flowing for 1 sec is:

a) 2.5 x 10^19

b) 1.25 x 10^13

c) 2.5 x 10^20

d) 6 x 10^8

32 / 50

32. When the internal resistance 'r of a source is equal to the load resistance, 'R the maximum power output is given by:

a) E/r

b) E²/r

c) E²/4r

d) E/2r

33 / 50

33. The current which is assumed to be flowing in a circuit from positive terminal to negative, is called:

a) Direct current

b) Pulsating current

c) Conventional current

d) Alternating current

34 / 50

34. Drift is the random motion of the electrons within a conductor:

a) With a very slow net velocity in the opposite direction of the field

b) With accelerated motion in the direction of the field

c) With a very high net velocity in the opposite direction of the field

d) With zero motion in the direction of the field

35 / 50

35. The temperature coefficient of resistivity is independent of:

a) Change in resistance

b) Change in temperature

c) Change in length

d) None of these

36 / 50

36. The ratio of electric current to potential difference is known as

a) Conductance

b) Resistance

c) specific resistance

d) Conductivity

37 / 50

37. With the increase of temperature, the conductance of wire

a) Increases

b) Decreases

c) Remains same

d) No effect

38 / 50

38. The S.I Unit of conductivity is:

a) Ω. m

b) Ω/m

c) m.Ω^-1

d) Ω^-1.m^-1

39 / 50

39. The current which flows from higher potential to the lower potential is known as

a) Electronic current

b) Conventional current

c) Normal Current

d) All of them

40 / 50

40. Two wires A and B are made of copper both wires are 1m long but wire A is 1 mm thick and wire B is 2mm Thick. The specific resistance:

a) More in A

b) More in B

c) Same for both

d) Can't be defined

41 / 50

41. Equivalent resistance of the combination of different resistance in parallel combinations will:

a) Increase

b) Decrease

c) Remain same

d) Double of the addition of all

42 / 50

42. When a wires of any resistance is bended and curved then its resistance would be:

a) Increase

b) Decrease

c) Remain same

d) Become infinite

43 / 50

43. Area under curve for the ohmic graph represent:

a) Electric charge

b) Electric power

c) Electric energy

d) Electric resistance

44 / 50

44. All those devices obeying ohm's law are:

a) Linear device

b) Non linear

c) Critical device

d) Co-linear device

45 / 50

45. Direction of current in a circuit is same as that of:

a) Electrons

b) Protons

c) Either of electron or proton

d) Photons

46 / 50

46. Moving charge in space can produce:

a) Electric field

b) Magnetic field

c) Both

d) None

47 / 50

47. Direction of electron moving in a circuit is:

a) Same as current

b) Opposite to current

c) Electrons are stationary

d) None

48 / 50

48. Resistances of 2.0 Ohm, 4.0 Ohm, and 6.0 Ohm and a 24-V EMF device are all in series.
Current in all resistors is:

a) Same

b) Different

c) Zero

d) Can't be defined

49 / 50

49. Resistances of 2.0 Ohm, 4.0 Ohm, and 6.0 Ohm and a 24-V EMF device are all in parallel. The current in the 2.0 Ohm resistor is:

a) 4

b) 12

c) 24

d) 4.4

50 / 50

50. A battery with an EMF of 12 V and an internal resistance of 1 Ohm is used to charge a battery with an EMF of 10 V and an internal resistance of 1 Ohm. The current in the circuit is:

a) 1 A

b) 2 A

c) 4 A

d) 12 A

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Instructions for Current Electricity Online Test Mdcat-2024:

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