ainfoera.com – MCQs, Mock Tests | MCAT MCAT Physics Mcq Questions Electromagnetic Induction

1 Potential difference is the work done in moving unit positive charge form one point to another

A in the direction of electric intensity B against electric intensity C in any direction D in the direction of electric flux

✅ Correct Answer: 2

2 Equipotential planes are

A parallel to one another B non parallel to one another C intersecting D circular

✅ Correct Answer: 1

3 The value of the capacitance depends upon the

A voltage applied B thickness of the capacitor plates C geometry of the capacitor D dinsity of the capacitor plates

✅ Correct Answer: 3

4 A 25eV electron has a speed of

A 2 x 106m/sec B 3 x 106m/sec C 5 x 106m/sec D 4 x 106m/sec

✅ Correct Answer: 2

5 A 5 ?F capacitor has a potential difference across its plates of 200 volts. The charge on the capacitor is

A 2.5 x 10-8 C B 10-5 C C 103 C D 4 x 103 C

✅ Correct Answer: 2

6 capacitor is to have an energy content of 20J it must be placed across a potential difference of

A 4 volts B 9 volts C 2 volts D 1 vol

✅ Correct Answer: 3

7 Equivalent capacitance is greater than individual capacitances in

A series combination B parallel combination C both series and parallel combinations D none of above

✅ Correct Answer: 2

8 Two oppositely charged balls A and B attract third conducting ball C when placed near them turn by turn. Then ball C must be

A positively charged B electrically neutral C negatively charged D positively and negatively charged

✅ Correct Answer: 2

9 The number of electrons in one coulomb charge is equal to

A 6.2 x 1018 B 1.6 x 1019 C 6.2 x 1021 D 1.6 x 10-27

✅ Correct Answer: 1

10 In a non-uniform electric field a polar molecule will experience

A Net torque B Net force C both series and parallel combinations D zero

✅ Correct Answer: 3

11 SI unit of permitivity of free space is

A Nm2C2 B N-1mC-2 C NmC-1 D N-1m-2C2

✅ Correct Answer: 4

12 Value of ?r for various dielectrics is always

A less than unity B equal to unit C larger than unit D no hard and fast rule

✅ Correct Answer: 3

13 Electric intensity at infinite distance from the point charge is

A zero B infinite C positive D negative

✅ Correct Answer: 1

14 Which one of the following can be taken as the measure of electric intensity ?

A F/A B ?/A C ???/A D q/??A

✅ Correct Answer: 2

15 Electric flux due to a point charge +q is

A 1/4II?? . q/r B q/?? C 1/4II?? . q/r2 D 4II??

✅ Correct Answer: 2

16 N/C =

A V/A B J/V C V/m D A/m

✅ Correct Answer: 3

17 A charge of 0.10C accelerated through a potential difference of 1000V acquires kinetic energy

A 200J B 100J C 1000J D 100 eV

✅ Correct Answer: 2

18 A capacitor is a perfect insulator for

A direct current B alternating current C both for the direct and alternating current D none of above

✅ Correct Answer: 1

19 Three capacitors C1 C2 and C3 are connected in parallel as in the Fig. The equivalent capacitance will be

A 8?F B 0.8?F C 1?F D 16?F

✅ Correct Answer: 1

20 In a charged capacitor the energy resides in

A magnetic hield B electric field C nuclear field D gravitational field

✅ Correct Answer: 2

21 For what value of ? the electric flux has average value of those of extreme values ?

A 60? B 45? C 90? D 0?

✅ Correct Answer: 1

22 Electric field due to positive charged plate is E = ?/2??. If oppositely charged plate of same amount is placed parallel to it, then resultant field contains amount of energy

A Q/?oA B Q/e C QV2 D Q2/C

✅ Correct Answer: 4

23 Work done in moving a point charge from one point to another point of equipotential surface is

A ?W = 1?V B ?W = F?r C zero D W = 1/4????V

✅ Correct Answer: 3

24 Selenium becomes a conductor in light so it behaves like

A Semiconductor B Photodiode C Light emitting diode D Capacitor

✅ Correct Answer: 2

25 Photocopier and inject printer are dealt in

A Electrostatics B Charges in motion C Capacitors D Electric fields

✅ Correct Answer: 1

26 If a charged rod is brought closer to a gas filled balloon then

A Radius decreases B Balloon bursts C Radius increase D Balloon squeezes

✅ Correct Answer: 3

27 If metallic conductor is charged negatively then its weight

A Remains same B First increases then decreases C Decreases then increases D Increases for a while

✅ Correct Answer: 4

28 If mica sheet is placed between the plates of a capacitor the capacity

A increases B decreases C increases then decreases D decreases then increases

✅ Correct Answer: 1

29 If two charges are increased by two times then force

A Decreases 9 times B Increases 9 times C Increases 4 times D Decreases 4 times

✅ Correct Answer: 3

30 If an electrons is allowed to move along the field in a non uniform electric field then it will follow

A Spiral path B Straight line C Curved path D Circular path

✅ Correct Answer: 2

31 The practical illustration of the phenomenon of mutual induction is

A A.C generator B D.C dynamo C induction coil D transformer

✅ Correct Answer: 4

32 Weber is the unit of

A Magnetic field intensity B magnetic induction C magnetic flux D self-inductance

✅ Correct Answer: 3

33 Current produced by moving the loop of wire across a magnetic field is called

A A.C current B D.C current C induced current D mean square current

✅ Correct Answer: 3

34 emf induced in a circuit according to Faradays law depends on the

A maximum magnetic flux B rate of change of magnetic flux C change in magnetic flux D initial magnetic flux

✅ Correct Answer: 2

35 cmf generated by A.C dynamo depends upon

A number of turns in the coil B magnetic field strength C frequency of rotation D all of above

✅ Correct Answer: 4

36 An alternating current or voltage

A fluctuates off and on B varies in magnitude alone C changes its direction again and again D changes its magnitude continuously and reverses its direction of flow after regularly recurring intervals.

✅ Correct Answer: 4

37 A dynamo converts

A mechanical energy into electrical energy B electrical energy into mechanical energy C magnetic energy into mechanical energy D magnetic energy into electrical energy

✅ Correct Answer: 1

38 Which one of the following functions like a motor?

A galvanometer B ammeter C voltmeter D all of above

✅ Correct Answer: 4

39 A.C cannot be used for

A producing heat B producing light C magnetizing and electroplating D all the above

✅ Correct Answer: 3

40 Which of the following works on torque on the current carrying conductor placed in magnetic field.

A galvanometer B ammeter C voltmeter D all of the above

✅ Correct Answer: 4

41 Self inductance of a coil depends upon

A current flowing B number of turns per unit length C voltage produce D all

✅ Correct Answer: 4

42 If the coil is wound on an iron core the flux through it will

A decrease B become zero C remain the same D increase

✅ Correct Answer: 4

43 Energy stored in a magnetic field is given by

A LI2 B L2I/2 C LI2/2 D IL2

✅ Correct Answer: 3

44 Inductors acts as a short circuit for

A AC B DC C Both (a) and (b) D none of these

✅ Correct Answer: 2

45 For electroplating we use

A A D.C source B an A.C source C any source D all of the above

✅ Correct Answer: 1

46 Which of the following uses electric energy and does not convert it into any other form?

A transformer B motor C D.C generator D A.C generator

✅ Correct Answer: 1

47 The only difference between construction of D.C generator and A.C generator is that of

A carbon brushes B coil C commutator D magnetic field

✅ Correct Answer: 3

48 A.C and D.C have the same

A effect in charging a capacitor B effect in charging a battery C effect while passing through an inductance D heating effect through a resistance

✅ Correct Answer: 4

49 If the secondary coil has Ns turns and the primary Np turns the relation between secondary and primary voltages is given by

A Vs/Vp = Np/Ns B Vs/Vp = Ns/Np C Vp/Vs = Ns/Np D Vp/Vs = Np/Ns

✅ Correct Answer: 2

50 Power loss in actual transformer is due to

A Small output B Eddy currents and magnetic hysterias C Soft iron core D Back emf

✅ Correct Answer: 2

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MCAT Physics Mcq Questions Electromagnetic Induction