CBSE 12th Physics (Term 1) Paper 2021-22

MCQ (Single Correct Answer)

+0.77

-0

The rms current in a circuit connected to a 50 Hz ac source is 15 A. The value of the current in the circuit $$\left( {{1 \over {600}}} \right)$$s after the instant the current is zero, is -

$${{15} \over {\sqrt 2 }}A$$

$$15\sqrt 2 A$$

$${{\sqrt 2 } \over {15}}A$$

$$8A$$

CBSE 12th Physics (Term 1) Paper 2021-22

MCQ (Single Correct Answer)

+0.77

-0

In a circuit the phase difference between the alternating current and the source voltage is $${\pi \over 2}$$. Which of the following cannot be the elements of the circuit?

only C

only L

L and R

L or C

CBSE 12th Physics (Term 1) Paper 2021-22

MCQ (Single Correct Answer)

+0.77

-0

The impedance of a series LCR circuit is -

$$R + {X_L} + {X_C}$$

$$\sqrt {{1 \over {X_C^2}} + {1 \over {X_L^2}} + {R^2}} $$

$$\sqrt {X_L^2 - X_C^2 + {R^2}} $$

$$\sqrt {{R^2} + {{({X_L} - {X_C})}^2}} $$

CBSE 12th Physics (Term 1) Paper 2021-22

MCQ (Single Correct Answer)

+0.77

-0

When an alternating voltage E = E_o sin $$\omega$$t is applied to a circuit, a current $$I = {I_o}\sin \left( {\omega t + {\pi \over 2}} \right)$$ flows through it. The average power dissipated in the circuit is

$${E_{rms}}\,.\,{I_{rms}}$$

$${E_o}{I_o}$$

$${{{E_o}{I_0}} \over {\sqrt 2 }}$$

Zero