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 |
72%
From NCERT
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 |
68%
From NCERT
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. \(6.4~\text{V}\)
1. \(2~\text{eV}\)
2. \(2~\text{V}\)
3. \(1.1~\text{V}\)
4. \(6.4~\text{V}\)
Subtopic: Einstein's Photoelectric Equation |
67%
From NCERT
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
(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 |
54%
From NCERT
NEET - 2022
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Identify the equivalent logic gate represented by the circuit given below:
1. \(\text{OR}\)
2. \(\text{NOR}\)
3. \(\text{AND}\)
4. \(\text{NAND}\)
1. \(\text{OR}\)
2. \(\text{NOR}\)
3. \(\text{AND}\)
4. \(\text{NAND}\)
Subtopic: Logic gates |
63%
From NCERT
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 the same. |
| 2. | pressure on the base area of vessels \(A\) and \(B\) is not the same. |
| 3. | both vessels \(A\) and \(B\) weigh the same. |
| 4. | vessel \(B\) weighs twice that of \(A\). |
Subtopic: Pressure |
72%
From NCERT
NEET - 2022
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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. | \(\dfrac{C}{2}\) |
| 3. | \(4C\) | 4. | \(\dfrac{C}{4}\) |
Subtopic: Capacitance |
81%
From NCERT
NEET - 2022
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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
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 |
68%
From NCERT
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. \(10,~2\)
1. \(5, ~\sqrt3\)
2. \(4,~ \sqrt5\)
3. \(10, ~\sqrt2\)
4. \(10,~2\)
Subtopic: Vector Product |
75%
From NCERT
NEET - 2022
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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. \(\dfrac{I}{2}\)
2. \(\dfrac{I}{3}\)
3. \(\dfrac{3I}{4}\)
4. \(\dfrac{2I}{3}\)
1. \(\dfrac{I}{2}\)
2. \(\dfrac{I}{3}\)
3. \(\dfrac{3I}{4}\)
4. \(\dfrac{2I}{3}\)
Subtopic: Polarization of Light |
83%
From NCERT
NEET - 2022
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