ENTRANCE TEST â€“ 2012 | Multiple Questions and Answers

1.	What happens to the magnet as the iron core is inserted into the solenoid?

	A.	It moves towards solenoid and rotates through
	B.	It moves towards the solenoid
	C.	It moves away from solenoid 180o
	D.	It moves away from solenoid and rotates through 180o

2.	A 10 cm long solenoid has 100 turns. What will be the magnetic field inside it along its axis if one micro ampere current is passed through it?

	A.	4Ï€ x 10-13 tesla
	B.	4Ï€ x 10-7 tesla
	C.	4Ï€ x 10-10 tesla
	D.	4Ï€ x 10-16 tesla

3.	The kinetic energy K.E. with which the electron strikes the target is given by:

	A.	K.E. = e2V
	B.	K.E. = hc/Î»
	C.	K.E. = hf2
	D.	K.E. = eV

4.	LASER is an acronym for:

	A.	Light amplification by stimulated emission of radiation
	B.	Light annihilation by stimulated emission of radiation
	C.	Light amplitude of stimulated emission of radiation
	D.	Light amplification by stimulated emission of radio