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%
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 |
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. \(10,~2\)
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 |
80%
From NCERT
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The restoring force of a spring, with a block attached to the free end of the spring, is represented by:
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Spring mass system |
65%
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If the screen is moved away from the plane of the slits in Young's double slit experiment, then the:
| 1. | angular separation of the fringes increases. |
| 2. | angular separation of the fringes decreases. |
| 3. | linear separation of the fringes increases. |
| 4. | linear separation of the fringes decreases. |
Subtopic: Young's Double Slit Experiment |
63%
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The effective capacitances of two capacitors are \(3~\mu \text{F}\) and \(16~\mu \text{F}\), when they are connected in series and parallel respectively. The capacitance of two capacitors are:
| 1. | \(10 ~\mu \text{F}, ~6~\mu \text{F}\) | 2. | \(8 ~\mu \text{F}, ~8~\mu \text{F}\) |
| 3. | \(12~\mu \text{F},~ 4~\mu \text{F}\) | 4. | \(1.2~\mu \text{F},~1.8~\mu \text{F}\) |
Subtopic: Combination of Capacitors |
77%
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The distance covered by a body of mass \(5\) g having linear momentum \(0.3\) kg-m/s in \(5\) s is:
1. \(300\) m
2. \(30\) m
3. \(3\) m
4. \(0.3\) m
1. \(300\) m
2. \(30\) m
3. \(3\) m
4. \(0.3\) m
Subtopic: Newton's Laws |
68%
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NEET - 2022
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A gravitational field is present in a region and a mass is shifted from \(A\) to \(B\) through different paths as shown. If \(\mathrm{W_1}\), \(\mathrm{W_2}\) and \(\mathrm{W_3}\) represent the work done by the gravitational force along their respective paths, then:
| 1. | \(\mathrm{W}_1=\mathrm{W}_2=\mathrm{W}_3\) | 2. | \(\mathrm{W}_1>\mathrm{W}_2>\mathrm{W}_3\) |
| 3. | \(\mathrm{W}_1>\mathrm{W}_3>\mathrm{W}_2\) | 4. | \(\mathrm{W}_1<\mathrm{W}_2<\mathrm{W}_3\) |
Subtopic: Gravitational Potential Energy |
85%
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Subtopic: Derivation of Ohm's Law |
79%
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