- This Mock test contains 30 MCQ questions.
- Choice and sequence for attempting questions will be as per the convenience of the candidate.
- Read each question carefully.
- Determine the one correct answer out of the four available options given for each question.
- Each question awards you 1 point.
- You can end the test any time by clicking “quiz summary>finish quiz”.
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Question 1 of 30
1. Question1 point(s)
Magnetic flux passing through a coil is initially. It reduces to of its original value in ‘ ’ second. If the e.m.f. induced is then ‘ ’ in second isCorrectIncorrect
Question 2 of 30
2. Question1 point(s)
A coil having n turns and resistance R is connected with a galvanometer of resistance 4R. This combination is moved in time t seconds from a magnetic fieldweber to weber. The induced current in the circuit isCorrectIncorrect
Question 3 of 30
3. Question1 point(s)
A rod of 10 cm length is moving perpendicular to uniform magnetic field of intensity 5×10^(-4)”Wbm”^(-2). If the acceleration of the rod is 5ms^(-1), then the rate of increase of induced emf isCorrectIncorrect
Question 4 of 30
4. Question1 point(s)
A boat is moving due east in a region where the earth’s magnetic field is 5.0×10^(-5) NA^(-1)m^(-1) due north and horizontal. The boat carries a vertical aerial 2 m long. If the speed of the boat is 1.50 ms^(-1), the magnitude of the induced emf in the wire of aerial isCorrectIncorrect
Question 5 of 30
5. Question1 point(s)In which of the following devices, the eddy current effect is not used ?CorrectIncorrect
Question 6 of 30
6. Question1 point(s)
A long solenoid hasturns. When a current of flows through it, the magnetic flux linked with each turn of the solenoid is . The self-inductance of the solenoid isCorrectIncorrect
Question 7 of 30
7. Question1 point(s)
The magnetic potential energy stored in a certain inductor iswhen the current in the inductor is This inductor is of inductanceCorrectIncorrect
Question 8 of 30
8. Question1 point(s)
Two coils A and B have mutual inductance 2×10^(-2) Henry if the current in he primary coil is i=5 sin (10πt) then the maximum value of emf induced in coil B isCorrectIncorrect
Question 9 of 30
9. Question1 point(s)
Two coils have a mutual inductance 0.005 H. The current changes in the first coil according to equationwhere and rad/sec. The maximum value of e.m.f. in the second coil isCorrectIncorrect
Question 10 of 30
10. Question1 point(s)
An ideal transformer convertsa.c. to a.c. to transmit a power of . If primary coil has turns, then alternating current in secondary coil isCorrectIncorrect
Question 11 of 30
11. Question1 point(s)
A step up transformer operates on aline and a load current of The ratio of the primary and secondary windings is The current in the primary isCorrectIncorrect
Question 12 of 30
12. Question1 point(s)
A 800 turn coil of effective area 0.05is kept perpendicular to a magnetic field T. When the plane of the coil is rotated by around any of its coplanar axis in 0.1 s, the emf induced in the coil will beCorrectIncorrect
Question 13 of 30
13. Question1 point(s)
Alternating current of peak valueampere flows through the primary coil of the transformer. The coefficient of mutual inductance between primary and secondary coil is 1 henry. The peak e.m.f. induced in secondary coil is
(Frequency of )CorrectIncorrect
Question 14 of 30
14. Question1 point(s)
A metallic rod of lengthis tied to a string of length and made to rotate with angular speed ( on a horizontal table with one end of the string fixed. If there is a vertical magnetic field in the region, the emf induced across the ends of the rod isCorrectIncorrect
Question 15 of 30
15. Question1 point(s)
A wire loop is rotated in magnetic field. The frequency of change of direction of the induced e.m.f. is :CorrectIncorrect
Question 16 of 30
16. Question1 point(s)
A square coil of sidehaving turns is rotated with a uniform speed in a magnetic field about an axis perpendicular to the direction of the field. At an instant , the emf induced in the coil is . The magnetic induction isCorrectIncorrect
Question 17 of 30
17. Question1 point(s)
A six pole generator with fixed field excitation develops an emf of, when operating at . At what speed must it rotate to developCorrectIncorrect
Question 18 of 30
18. Question1 point(s)
Ainput is supplied to a transformer. The output circuit draws a current of ampere at . If the efficiency of the transformer is , the current drawn by the primary windings of the transformer isCorrectIncorrect
Question 19 of 30
19. Question1 point(s)
The ratio of secondary to the primary turns in a transformer is 3 : 2 and the output power is P.
Neglecting all power losses, the input power must beCorrectIncorrect
Question 20 of 30
20. Question1 point(s)
If the current is halved in a coil, then the energy stored is how much times the previous valueCorrectIncorrect
Question 21 of 30
21. Question1 point(s)
When the current changes from +2A to -2A in 0.5 second an emf of 8V is induced in a coil. The coefficient of self induction of the coil isCorrectIncorrect
Question 22 of 30
22. Question1 point(s)
If in a coil rate of change of area is (5meter^(2))/(milli second)and current become 1 amp from 2 amp in 2×10^(-3) sec. if magnetic field is 1 Tesla then self-inductance of the coil isCorrectIncorrect
Question 23 of 30
23. Question1 point(s)
A circular coil of radiusand turns carries a current . What is the magnetic moment of the coil ?CorrectIncorrect
Question 24 of 30
24. Question1 point(s)
A square coil of 10^(-2) m^(2) area is placed perpendicular to a uniform magnetic field of 10^(3) Wb//m^(2). What is magnetic flux through the coil?CorrectIncorrect
Question 25 of 30
25. Question1 point(s)
The dimensional formula of magnetic flux isCorrectIncorrect
Question 26 of 30
26. Question1 point(s)
If the current in the primary coil is reduced from 3A to zero in 10 second, then the induced e.m.f. in the secondary is 15×10^(-3) volt. The mutual inductance of the coil will beCorrectIncorrect
Question 27 of 30
27. Question1 point(s)
A 50 mH coil carries a current of 2 ampere. The energy stored in joules isCorrectIncorrect
Question 28 of 30
28. Question1 point(s)
In a coil of self-inductancehenry, the rate of change of current is ampere per second. The e.m.f. induced in the coil, isCorrectIncorrect
Question 29 of 30
29. Question1 point(s)
A long solenoid has 500 turns. When a current of 2 ampere is passed through it, the resulting magnetic flux linked with each turn of the solenoid isWb. The self-inductance of the solenoid isCorrectIncorrect
Question 30 of 30
30. Question1 point(s)
Eddy currents do not cause :CorrectIncorrect