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. \(9\lambda\)
Subtopic: Spectral Series |
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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
Subtopic: Colour Coding of Resistors (OLD NCERT) |
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. \(\frac{3v}{4}\)
2. \(\frac{v}{3}\)
3. \(\frac{2v}{3}\)
4. \(\frac{4v}{3}\)
1. \(\frac{3v}{4}\)
2. \(\frac{v}{3}\)
3. \(\frac{2v}{3}\)
4. \(\frac{4v}{3}\)
Subtopic: Average Speed & Average Velocity |
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The potential energy of a long spring when stretched by \(2\) cm is \(U\). If the spring is stretched by \(8\) cm, potential energy stored in it will be:
| 1. | \(16U\) | 2. | \(2U\) |
| 3. | \(4U\) | 4. | \(8U\) |
Subtopic: Elastic Potential Energy |
72%
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A bullet is fired from a gun at the speed of \(280\) ms–1 in the direction \(30^\circ\) above the horizontal. The maximum height attained by the bullet is: (\(g=9.8\) ms–2, \(\mathrm{sin}30^{0}=0.5\) )
| 1. | \(3000\) m | 2. | \(2800\) m |
| 3. | \(2000\) m | 4. | \(1000\) m |
Subtopic: Projectile Motion |
63%
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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
Subtopic: Radioactivity (OLD NCERT) |
55%
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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 |
84%
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A metal wire has mass \((0.4\pm 0.002)~\mathrm{g}\), radius \((0.3\pm 0.001)~\mathrm{mm}\) and length \((5\pm 0.02)~\mathrm{cm}\). The maximum possible percentage error in the measurement of density will nearly be:
1. \(1.4 \%\)
2. \(1.2 \%\)
3. \(1.3 \%\)
4. \(1.6 \%\)
1. \(1.4 \%\)
2. \(1.2 \%\)
3. \(1.3 \%\)
4. \(1.6 \%\)
Subtopic: Errors |
From NCERT
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The angular acceleration of a body, moving along the circumference of a circle, is:
| 1. | along the axis of rotation |
| 2. | along the radius, away from centre |
| 3. | along the radius towards the centre |
| 4. | along the tangent to its position |
Subtopic: Rotational Motion: Kinematics |
From NCERT
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The magnetic energy stored in an inductor of inductance \(4~\mathrm{\mu H}\) carrying a current of \(2~\text{A}\) is:
1. \(8~\mathrm{\mu J}\)
2. \(4~\mathrm{\mu J}\)
3. \(4~\mathrm{mJ}\)
4. \(8~\mathrm{mJ}\)
1. \(8~\mathrm{\mu J}\)
2. \(4~\mathrm{\mu J}\)
3. \(4~\mathrm{mJ}\)
4. \(8~\mathrm{mJ}\)
Subtopic: Self - Inductance |
74%
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