The ratio of frequencies of fundamental harmonic produced by an open pipe to that of closed pipe having the same length is:
1.
\(3:1\)
2.
\(1:2\)
3.
\(2:1\)
4.
\(1:3\)
Subtopic: Standing Waves |
62%
From NCERT
NEET - 2023
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The ratio of the radius of gyration of a solid sphere of mass \(M\) and radius \(R\) about its own axis to the radius of gyration of the thin hollow sphere of the same mass and radius about its axis is:
1. \(5:2\)
2. \(3:5\)
3. \(5:3\)
4. \(2:5\)
1. \(5:2\)
2. \(3:5\)
3. \(5:3\)
4. \(2:5\)
Subtopic: Moment of Inertia |
68%
From NCERT
NEET - 2023
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An AC source is connected to a capacitor \(C\). Due to decrease in its operating frequency:
| 1. | capacitive reactance remains constant |
| 2. | capacitive reactance decreases. |
| 3. | displacement current increases. |
| 4. | displacement current decreases. |
Subtopic: Different Types of AC Circuits |
50%
From NCERT
NEET - 2023
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In hydrogen spectrum, the shortest wavelength in the Balmer series is \(\lambda\). The shortest wavelength in the Bracket series is:
1. \(16\lambda\)
2. \(2\lambda\)
3. \(4\lambda\)
4. \(9\lambda\)
1. \(16\lambda\)
2. \(2\lambda\)
3. \(4\lambda\)
4. \(9\lambda\)
Subtopic: Spectral Series |
64%
From NCERT
NEET - 2023
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Resistance of a carbon resistor determined from colour codes is \((22000 \pm 5 \%) ~\Omega\). The colour of third band must be:
1. Yellow
2. Red
3. Green
4. Orange
1. Yellow
2. Red
3. Green
4. Orange
From NCERT
NEET - 2023
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A vehicle travels half the distance with speed \(v\) and the remaining distance with speed \(2v.\) Its average speed is:
| 1. | \(\dfrac{3v}{4}\) | 2. | \(\dfrac{v}{3}\) |
| 3. | \(\dfrac{2v}{3}\) | 4. | \(\dfrac{4v}{3}\) |
Subtopic: Average Speed & Average Velocity |
70%
From NCERT
NEET - 2023
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The potential energy of a long spring when stretched by \(2~\text{cm}\) is \(U.\) If the spring is stretched by \(8~\text{cm},\) the potential energy stored in it will be:
| 1. | \(16U\) | 2. | \(2U\) |
| 3. | \(4U\) | 4. | \(8U\) |
Subtopic: Elastic Potential Energy |
75%
From NCERT
NEET - 2023
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A bullet is fired from a gun at the speed of \(280~\text{ms}^{-1}\) in the direction \(30^\circ\) above the horizontal. The maximum height attained by the bullet is:\(\left(g=9.8~\text{m/s}^{2}, \sin30^{\circ}=0.5\right)\)
| 1. | \(3000~\text{m}\) | 2. | \(2800~\text{m}\) |
| 3. | \(2000~\text{m}\) | 4. | \(1000~\text{m}\) |
Subtopic: Projectile Motion |
66%
From NCERT
NEET - 2023
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The half-life of a radioactive substance is \(20\) minutes. In how much time, the activity of substance drops to \((\frac{1}{16})^{\mathrm{th}}\) of its initial value?
1. \(80\) minutes
2. \(20\) minutes
3. \(40\) minutes
4. \(60\) minutes
1. \(80\) minutes
2. \(20\) minutes
3. \(40\) minutes
4. \(60\) minutes
55%
From NCERT
NEET - 2023
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The net magnetic flux through any closed surface is:
1. negative
2. zero
3. positive
4. infinity
1. negative
2. zero
3. positive
4. infinity
Subtopic: Analogy between Electrostatics & Magnetostatics |
86%
From NCERT
NEET - 2023
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