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 False but Statement II is True.
2.
Both Statement I and Statement II are True.
3.
Both Statement I and Statement II are False.
4.
Statement I is True but Statement II is False.
Subtopic: Applications of PN junction |
74%
From NCERT
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. \(1.6 \times 10^{-7} ~\text{T}\)
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 |
59%
From NCERT
NEET - 2023
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The temperature of a gas is \(-50^\circ \mathrm{C}\). To what temperature the gas should be heated so that the rms speed is increased by \(3\) times?
| 1. | \(223\) \(\text{K}\) | 2. | \(669^\circ \mathrm{C}\) |
| 3. | \(3295^\circ \mathrm{C}\) | 4. | \(3097\) \(\text{K}\) |
Subtopic: Types of Velocities |
51%
From NCERT
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. | \(\frac{5}{9}~\text{A}\) from \(\mathrm{A}\) to \(\mathrm{B}\) through \(E\) |
Subtopic: Kirchoff's Voltage Law |
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From NCERT
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 |
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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. \(\frac{2W}{A}\)
3. \(\frac{W}{A}\)
4. \(\frac{W}{2A}\)
1. zero
2. \(\frac{2W}{A}\)
3. \(\frac{W}{A}\)
4. \(\frac{W}{2A}\)
Subtopic: Stress - Strain |
66%
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%
From NCERT
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 |
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NEET - 2023
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A \(12~\text{V},60~\text{W}\) 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. \(0.37 ~\mathrm{A}\)
2. \(0.27 ~\mathrm{A}\)
3. \(2.7 ~\mathrm{A}\)
4. \(3.7 ~\mathrm{A}\)
1. \(0.37 ~\mathrm{A}\)
2. \(0.27 ~\mathrm{A}\)
3. \(2.7 ~\mathrm{A}\)
4. \(3.7 ~\mathrm{A}\)
Subtopic: Transformer |
68%
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NEET - 2023
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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. | \(1.59~\text{rad/s}\) |
Subtopic: Different Types of AC Circuits |
62%
From NCERT
NEET - 2023
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