Physics test chapter 15+16 (2)

1.     Which of the following is produced first

a)     Induced emf

b)    Induced current

c)     Motional emf

d)    None of above

2.     If a closed metallic loop is moved across a magnetic field then

a)     Induced current is produced in it

b)    No induced current is produced

c)     Magnetic will attract the loop

d)    None of these

3.     The phenomenon by which an induced emf is produced in the conductor due to magnetic flux in it is called

a)     Electromagnetism

b)    Electromagnetic induction

c)     Electric polarization

d)    All of the above

4.     The circuit in which current and voltage are in phase, the power factor is

a)     Doubled

b)    Negative

c)     One

d)    Zero

5.     The phase angle between the voltage and the current in an AC circuit consisting of a resistance is

a)     Zero

b)    45⁰

c)     90⁰

d)    180⁰

6.     Pure coke consumes

a)     Minimum power

b)    Maximum power

c)     No power

d)    Average power

7.     Who derived the velocity of Electromagnetic waves

a)     Faraday

b)    Maxwell

c)     Lenz

d)    Einstein

8.     Electromagnetic waves travel in free space with the speed of

a)     gamma-rays

b)    Positive rays

c)     Cathode rays

d)    Β-rays

9.     25 watt and 100 watt bulbs are joined in series and connected to the mains. Which bulb will glow brighter?

a)     100W

b)    25W

c)     First 25W and then 100W

d)    None of these

10.                        For ideal transformer, V_s is _______ proportional to I_s.

a)     Directly

b)    Inversely

c)     Both a and b

d)    None of these