# An inductor of inductance $$2~\text{mH}$$ is connected to a $$220~\text{V}$$, $$50~\text{Hz}$$ ac source. Let the inductive reactance in the circuit is $$X_1$$. If a $$220~\text{V}$$ DC source replaces the AC source in the circuit, then the inductive reactance in the circuit is $$X_2$$. $$X_1$$ and $$X_2$$, respectively, are: 1. $$6.28~\Omega$$, zero 2. $$6.28~\Omega$$, infinity 3. $$0.628~\Omega$$, zero 4. $$0.628~\Omega$$, infinity

Subtopic:  Different Types of AC Circuits |
67%
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NEET - 2022
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During a cloudy day, a primary and a secondary rainbow may be created. Which of the following statement is correct?
 1 primary rainbow is due to double internal reflection and is formed above the secondary one. 2 primary rainbow is due to double internal reflection and is formed below the secondary one. 3 secondary rainbow is due to double internal reflection and is formed above the primary one. 4 secondary rainbow is due to a single internal reflection and is formed above the primary one.
Subtopic:  Total Internal Reflection |
66%
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NEET - 2022
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The light rays having photons of energy $$4.2~\text{eV}$$ are falling on a metal surface having a work function of $$2.2~\text{eV}.$$ The stopping potential of the surface is:
 1 $$2~\text{eV}$$ 2 $$2~\text{V}$$ 3 $$1.1~\text{V}$$ 4 $$6.4~\text{V}$$
Subtopic:  Einstein's Photoelectric Equation |
64%
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NEET - 2022
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In the diagram shown, the normal reaction force between $$2$$ kg and $$1$$ kg blocks is:
(Consider the surface to be smooth and $$g=10$$ ms–2 )

1. $$25$$ N
2. $$39$$ N
3. $$6$$ N
4. $$10$$ N
Subtopic:  Tension & Normal Reaction |
50%
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NEET - 2022
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Identify the equivalent logic gate represented by the circuit given below:

1. $$\mathrm{OR}$$
2. $$\mathrm{NOR}$$
3. $$\mathrm{AND}$$
4. $$\mathrm{NAND}$$
Subtopic:  Logic gates |
60%
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NEET - 2022
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Two copper vessels $$A$$ and $$B$$ have the same base area but are of different shapes. $$A$$ takes twice the volume of water that $$B$$ requires to fill up to a particular common height. Then the correct statement among the following is:
1. pressure on the base area of vessels $$A$$ and $$B$$ is same.
2. pressure on the base area of vessels $$A$$ and $$B$$ is not same.
3. both vessels $$A$$ and $$B$$ weigh the same.
4. vessel $$B$$ weighs twice that of $$A$$.
Subtopic:  Pressure |
68%
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The distance between the two plates of a parallel plate capacitor is doubled, and the area of each plate is halved. If $$C$$ is its initial capacitance, its final capacitance is equal to:
 1 $$2C$$ 2 $$\frac{C}{2}$$ 3 $$4C$$ 4 $$\frac{C}{4}$$
Subtopic:  Capacitance |
78%
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The terminal velocity of a copper ball of radius $$5~\text{mm}$$ falling through a tank of oil at room temperature is $$10~\text{cm}~\text{s}^{-1}$$ . If the viscosity of oil at room temperature is $$0.9~\text{kg}~\text{m}^{-1}~\text{s}^{-1}$$, the viscous drag force is:
1. $$8.48 \times10^{-3}$$ N
2. $$8.48 \times10^{-5}$$ N
3. $$4.23 \times10^{-3}$$ N
4. $$4.23 \times10^{-6}$$ N
Subtopic:  Stokes' Law |
64%
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NEET - 2022
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If $$\vec F=2\hat i+\hat j-\hat k$$ and $$\vec r=3\hat i+2\hat j-2\hat k,$$ then the scalar and vector products of $$\vec F$$ and $$\vec r$$ have the magnitudes, respectively, as:
1.  $$5, ~\sqrt3$$
2.  $$4,~ \sqrt5$$
3.  $$10, ~\sqrt2$$
4.  $$10,~2$$
Subtopic:  Vector Product |
75%
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After passing through a polarizer, a linearly polarized light of intensity $$I$$ is incident on an analyser making an angle of $$30^\circ$$ with the axes of the polariser. The intensity of light emitted from the analyser will be:
 1 $$\frac{I}{2}$$ 2 $$\frac{I}{3}$$ 3 $$\frac{3I}{4}$$ 4 $$\frac{2I}{3}$$
Subtopic:  Polarization of Light |
79%
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