CBSE 12th Physics Delhi Set 1 - 2023 | Class 12 Year Wise Previous Years Questions

CBSE 12th Physics Delhi Set 1 - 2023

MCQ (Single Correct Answer)

-0

Which of the following statements about a series LCR circuit connected to an ac source is correct?

If the frequency of the source is increased, the impedance of the circuit first decreases and then increases.

If the net reactance $$\left(X_L-X_C\right)$$ of circuit becomes equal to its resistance, then the current leads the voltage by $$45^{\circ}$$.

At resonance, the voltage drop across the inductor is more than that across the capacitor.

At resonance, the voltage drop across the capacitor is more than that across the inductor.

CBSE 12th Physics Delhi Set 1 - 2023

MCQ (Single Correct Answer)

-0

According to Huygens principle, the amplitude of secondary wavelets is

equal in both the forward and the backward directions.

maximum in the forward direction and zero in the backward direction.

large in the forward direction and small in the backward direction.

small in the forward direction and large in the backward direction.

CBSE 12th Physics Delhi Set 1 - 2023

MCQ (Single Correct Answer)

-0

The radius of the $$\mathrm{n}^{\text {th }}$$ orbit in Bohr model of hydrogen atom is proportional

$$n^2$$

$$\frac{1}{n^2}$$

$$n$$

$$\frac{1}{n}$$

CBSE 12th Physics Delhi Set 1 - 2023

MCQ (Single Correct Answer)

-0

Assertion (A) : The resistance of an intrinsic semiconductor decreases with increase in its temperature.

Reason (R) : The number of conduction electrons as well as hole increase in an intrinsic semiconductor with rise in its temperature.

Both Assertion (A) and Reason (R) are true and (R) is the correct explanation of (A).

Both Assertion (A) and Reason (R) are true and (R) is NOT the correct explanation of (A).

Assertion (A) is true and Reason (R) is false.

Assertion (A) is false and Reason (R) is also false.

Class 12 Papers

2023

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