1
CBSE 12th Physics (Term 1) Paper 2021-22
+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 -
A
$${{15} \over {\sqrt 2 }}A$$
B
$$15\sqrt 2 A$$
C
$${{\sqrt 2 } \over {15}}A$$
D
$$8A$$
2
CBSE 12th Physics (Term 1) Paper 2021-22
+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?
A
only C
B
only L
C
L and R
D
L or C
3
CBSE 12th Physics (Term 1) Paper 2021-22
+0.77
-0
The impedance of a series LCR circuit is -
A
$$R + {X_L} + {X_C}$$
B
$$\sqrt {{1 \over {X_C^2}} + {1 \over {X_L^2}} + {R^2}}$$
C
$$\sqrt {X_L^2 - X_C^2 + {R^2}}$$
D
$$\sqrt {{R^2} + {{({X_L} - {X_C})}^2}}$$
4
CBSE 12th Physics (Term 1) Paper 2021-22
+0.77
-0
When an alternating voltage E = Eo 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
A
$${E_{rms}}\,.\,{I_{rms}}$$
B
$${E_o}{I_o}$$
C
$${{{E_o}{I_0}} \over {\sqrt 2 }}$$
D
Zero
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