# Given below are two statements: Statement I: Photovoltaic devices can convert optical radiation into electricity. Statement II: Zener diode is designed to operate under reverse bias in the breakdown. 1. Statement I is incorrect but Statement II is correct. 2. Both Statement I and Statement II are correct. 3. Both Statement I and Statement II are incorrect. 4. Statement I is correct but Statement II is incorrect.

Subtopic:  Applications of PN junction |
74%
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NEET - 2023
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In a plane electromagnetic wave travelling in free space, the electric field component oscillates sinusoidally at a frequency of $$2.0\times 10^{10}~ \text{Hz}$$ and amplitude $$48~\text{Vm}^{-1}$$. Then the amplitude of the oscillating magnetic field is: (Speed of light in free space $$3\times 10^{8}~ \text{ms}^{-1}$$)
1. $$1.6 \times 10^{-6} ~\text{T}$$
2. $$1.6 \times 10^{-9} ~\text{T}$$
3. $$1.6 \times 10^{-8} ~\text{T}$$
4. $$1.6 \times 10^{-7} ~\text{T}$$
Subtopic:  Properties of EM Waves |
58%
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NEET - 2023
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The temperature of a gas is $$-50^\circ \text{C}$$. To what temperature the gas should be heated so that the rms speed is increased by $$3$$ times?
 1 $$223~\text{K}$$ 2 $$669^\circ \text{C}$$ 3 $$3295^\circ \text{C}$$ 4 $$3097~\text{K}$$
Subtopic:  Types of Velocities |
51%
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NEET - 2023
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The magnitude and direction of the current in the following circuit is:
 1 $$1.5~\text{A}$$ from $$\mathrm{B}$$ to $$\mathrm{A}$$ through $$E$$ 2 $$0.2~\text{A}$$ from $$\mathrm{B}$$ to $$\mathrm{A}$$ through $$E$$ 3 $$0.5~\text{A}$$  from $$\mathrm{A}$$ to $$\mathrm{B}$$ through $$E$$ 4 $$\dfrac{5}{9}~\text{A}$$ from $$\mathrm{A}$$ to $$\mathrm{B}$$ through $$E$$
Subtopic:  Kirchoff's Voltage Law |
70%
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NEET - 2023
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An electric dipole is placed at an angle of $$30^\circ$$ with an electric field of intensity $$2\times 10^5 ~\text{NC}^{-1}$$. It experiences a torque equal to $$4~\text{N-m}$$. Calculate the magnitude of charge on the dipole if the dipole length is $$2~\text{cm}$$.
1. $$2~\text{mC}$$
2. $$8~\text{mC}$$
3. $$6~\text{mC}$$
4. $$4~\text{mC}$$
Subtopic:  Electric Dipole |
71%
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NEET - 2023
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Let a wire be suspended from the ceiling (rigid support) and stretched by a weight $$W$$ attached at its free end. The longitudinal stress at any point of cross-sectional area $$A$$ of the wire is:
1. zero
2. $$\dfrac{2W}{A}$$
3. $$\dfrac{W}{A}$$
4. $$\dfrac{W}{2A}$$
Subtopic:  Stress - Strain |
65%
From NCERT
NEET - 2023
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The equivalent capacitance of the system shown in the following circuit is:

1. $$9~{\mu \text{F}}$$
2. $$2~{\mu \text{F}}$$
3. $$3~{\mu \text{F}}$$
4. $$6~{\mu \text{F}}$$
Subtopic:  Combination of Capacitors |
78%
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NEET - 2023
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The venturi-meter works on:
 1 The principle of perpendicular axes 2 Huygen's principle 3 Bernoulli's principle 4 The principle of parallel axes
Subtopic:  Bernoulli's Theorem |
81%
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NEET - 2023
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$$12~\text{V},60~\text{W}$$ lamp is connected to the secondary of a step down transformer, whose primary is connected to ac mains of $$220~\text{V}$$. Assuming the transformer to be ideal, what is the current in the primary winding?
1. $$0.37~\text{A}$$
2. $$0.27~\text{A}$$
3. $$2.7~\text{A}$$
4. $$3.7~\text{A}$$
Subtopic:  Transformer |
68%
From NCERT
NEET - 2023
In a series $${LCR}$$ circuit, the inductance $${L}$$ is $$10~\text{mH}$$, capacitance $${C}$$ is $$1~\mu\text{F}$$ and resistance $${R}$$ is $$100~\Omega$$. The frequency at which resonance occurs is:
 1 $$1.59~\text{kHz}$$ 2 $$15.9~\text{rad/s}$$ 3 $$15.9~\text{kHz}$$ 4 $$1.59~\text{rad/s}$$