Electromagnetic Induction Quiz-6

As per analysis for previous years, it has been observed that students preparing for NEET find Physics out of all the sections to be complex to handle and the majority of them are not able to comprehend the reason behind it. This problem arises especially because these aspirants appearing for the examination are more inclined to have a keen interest in Biology due to their medical background.

Furthermore, sections such as Physics are dominantly based on theories, laws, numerical in comparison to a section of Biology which is more of fact-based, life sciences, and includes substantial explanations. By using the table given below, you easily and directly access to the topics and respective links of MCQs. Moreover, to make learning smooth and efficient, all the questions come with their supportive solutions to make utilization of time even more productive. Students will be covered for all their studies as the topics are available from basics to even the most advanced.

Q51. A wheel with ten metallic spokes each 0.50 m long is rotated with a speed of 120 rev/min in a plane normal to the earth’s magnetic field at the place. If the magnitude of the field is 0.4 gauss, the induced e.m.f. between the axle and the rim of the wheel is equal to
•  1.256×10-3 V
•  6.28×10-4 V
•  1.256×10-4 V
•  6.28×10-5 V
Solution

Q52.Which type of losses donot occur in the transformer?
•  Iron losses
•  Copper losses
•  Mechanical losses
•  Flux leakage
Solution

Q53.  An transformer is employed to reduce 220 V to 11 V. The primary draws a current of 5 A and the secondary 90 A. The efficiency of the transformer is
•   20%
•  40%
•  70%
•  90%
Solution

Q54. The momentum in mechanics is expressed as m×V. The analogous expression in electricity is
•  i ×Q
•  i ×V
•  L ×i
•  L ×Q
Solution

Q55.The equivalent inductance of two inductance is 2.4 henry when connected in parallel and 10 henry when connected in series. The difference between the two inductances is
•  2 henry
•  3 henry
•  4 henry
•  5 henry
Solution

Q56. There is a uniform magnetic field directed perpendicular and into the plane of the paper. An irregular shaped conducting loop is slowly changing into a circular loop in the plane of the paper. Then
•  Current is induced in the loop in the anticlockwise direction
•  Current is induced in the loop in the clockwise direction
• AC is induced in the loop
•  No current is induced in the loop
Solution
As the shape of the loop is changing and hence, the flux linked with the loop changes. There will an induced emf hence, induced current in the coil. Applying right hand screw rule we get induced current in anticlockwise direction.

Q57.Lenz’s law applies to
•  Electrostatics
•  Lenses
•  Electro-magnetic induction
•  Cinema slides
Solution
Electro-magnetic induction

Q58.A coil of resistance 10 Î© and an inductance 5H is connected to a 100 volt battery. Then energy stored in the coil is
•  125 erg
•  125 J
•  250 erg
•  250 J
Solution

Q59.When the current changes from +2 A to -2 A in 0.05 s, an emf of 8 V is induced in a coil. The coefficient of self-induction of the coil is
•  0.2 H
•  0.4 H
•  0.8 H
•  0.1 H
Solution

Q60. Magnetic flux linked with a coil is Ï•=5t2+2t+3, where t is second and Ï• is in weber. At time t =1 s, the value of induced emf in volt
•  14
•  1.2
•  12
•  6
Solution

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