ECAT Pre Engineering Physics Chapter 15 MCQ Test With Answer

Top Scorers Of Physics ECAT Pre Engineering Chapter 15 Electromagnetic Induction MCQ`s Test

Sr.#	Question	Answer
1	Back emf is produced due to	A. Self induction B. Mutual induction C. A.C D. Lenz's law
2	The induced current in the loop can be increased by:	A. Using a stronger magnetic field B. Moving the loop faster C. Replacing the loop by a coil of many turns D. All above
3	The induced current in the loop can be increased by:	A. Using a strong magnetic field B. Moving the loop faster C. Replacing the loop by a coil of many turns D. All of above
4	In the equilibrium state, the potential difference between two ends of the conductor moving across a magnetic field is called:	A. Both A and C B. Induced emf C. Both A and B D. Motion emf
5	Step up transformer has a transformation ratio of 3:2. What is the voltage in secondary, if voltage in primary is 30V:	A. 45 V B. 15 V C. 90 V D. 300 V
6	Plan of a coil makes an angle of 20º with the lines of magnetic field. The angle between B and vector area of plane of coil is:	A. Also 20º B. 70º C. 90º D. 180º
7	The rate change of area expressed is expressed in:	A. None of these B. ms^-1 C. m²s^-2 D. ms^-2
8	The unit of induced emf is:	A. Volt B. Nm/As C. Joule coul^-1 D. Both A and C
9	What is the coefficient of mutual inductance, when the magnetic flux changes by 2 X 10^-2Wb, and change in current is 0.01 A?	A. 2 H B. 3 H C. 1/2 H D. Zero
10	The induced current is a conductor depends upon:	A. Resistance of the loop B. Speed with which the conductor moves C. Any of these D. Both (A) and (B)