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

Class 12 Subjects

Physics

Electromagnetism

Electrostatics Current Electricity Capacitor Magnetic Effect of Current Magnetic Properties of Matter Electromagnetic Induction Alternating Current Electromagnetic Waves

Optics

Geometrical Optics Wave Optics

Modern Physics

Atoms and Nuclei Dual Nature of Radiation Semiconductor