IIT JEE Questions And Answers :: Electromagnetic Induction Electromagnetic Waves: part1



IIT JEE : Electromagnetic Induction Electromagnetic Waves QUESTIONS AND ANSWERS :: part1 : 1 to 5

Following IIT JEE Entrance Multiple choice objective type questions and answers will help you in Maths, Physics and Chemistry 2014 examinations :

1.The electromagnetic waves of much short wavelength (25 mm to 5 mm) were produced and observed by:

Maxwell
Hertz
Marconi
J.C. Bose

2.A transformer has an efficiency of 80% and works at 100 V and 4 kW. If the secondary voltage is 240 V, then the value of primary current is:

28.5 A
40 A
20 A
80 A

3.Electromagnetic waves are transverse in nature is evident by:

polarization
interference
reflection
diffraction

4.A cylindrical bar magnet is kept along the axis of a circular coil. If the magnet is rotated about its axis, then:

a current will be induced in the coil
no current will be induced in the coil
an emf and a current both will be induced in the coil
none of the above

5.An inductance has a high resistance to AC and low to DC. When a DC voltage source having same AC component superimposed on it sends current through an inductance to a load resistance:

the DC voltage falls appreciably across the AC component falls only a small amount
the AC and DC voltages fall by the same small percentage
the AC voltage falls appreciably across the load and DC voltage falls by only a small amount
both AC and DC voltage fall to nearly zero

More Electromagnetic Induction Electromagnetic Waves QUESTIONS AND ANSWERS available in next pages

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