Physics MCQs Chapter 15+16

1.     The value of the steady current, when flowing through the same resistor produces heat at the rate as the mean rate of heat produced by the alternating current , is

a)     Average current

b)    Sinusoidal current

c)     r.m.s current

d)    net current

2.     To find the r.m.s value of an alternating current mathematically, we need to have

a)     Mean value of I²

b)    Square root of mean value of I²

c)     Square root of I²

d)    Square of I/2

3.     An alternating current of r.m.s value of 2A and a steady direct current I following through identical resistors dissipate heat at the same rate. What is the current?

a)     2A

b)     (2) ^½ A

c)     1A

d)    2 (2) ^½ A

1.c

2.b

3.a