The magnetic potential energy, when a magnetic bar of magnetic moment \(\overrightarrow{M}\) is placed perpendicular to the magnetic field \(\overrightarrow{B}\) is:
1. \(\frac{-mB}{2}\)
2. zero
3. \(-mB\)
4. \(mB\)
1. \(\frac{-mB}{2}\)
2. zero
3. \(-mB\)
4. \(mB\)
Subtopic: Magnetic Field & Field Lines |
72%
From NCERT
NEET - 2024
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A bob is whirled in a horizontal circle by means of a string at an initial speed of \(10\) rpm. If the tension in the string is quadrupled while keeping the radius constant, the new speed is:
| 1. | \(20\) rpm | 2. | \(40\) rpm |
| 3. | \(5\) rpm | 4. | \(10\) rpm |
Subtopic: Uniform Circular Motion |
63%
From NCERT
NEET - 2024
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A metal cube of a side \(5~\text{cm}\) is charged with \(6~\text{μC.}\) The surface charge density on the cube is:
1. \(0.125\times10^{-3}~\text{C m}^{-2}\)
2. \(0.25\times10^{-3}~\text{C m}^{-2}\)
3. \(4\times10^{-3}~\text{C m}^{-2}\)
4. \(0.4\times10^{-3}~\text{C m}^{-2}\)
1. \(0.125\times10^{-3}~\text{C m}^{-2}\)
2. \(0.25\times10^{-3}~\text{C m}^{-2}\)
3. \(4\times10^{-3}~\text{C m}^{-2}\)
4. \(0.4\times10^{-3}~\text{C m}^{-2}\)
Subtopic: Electric Charge |
From NCERT
NEET - 2024
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The incorrect relation for a diamagnetic material (all the symbols carry their usual meaning and \(\varepsilon\) is a small positive number) is:
| 1. | \(\mu<\mu_{0}\) | 2. | \(0\leqslant\mu_{\mathrm{r}}<1\) |
| 3. | \(-1\leqslant\chi<0\) | 4. | \(1<\mu_r<1+\varepsilon\) |
Subtopic: Magnetic Materials |
54%
From NCERT
NEET - 2024
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An ideal fluid is flowing in a non-uniform cross-sectional tube \(XY\) (as shown in the figure) from end \(X\) to end \(Y.\) If \(K_1\) and \(K_2\) are the kinetic energy per unit volume of the fluid at \(X\) and \(Y\) respectively, then the correct option is:
1. \(K_1\text=K_2\)
2. \({2K}_1\text={K}_2\)
3. \({K}_1>{K}_2\)
4. \({K}_1<{K}_2\)
1. \(K_1\text=K_2\)
2. \({2K}_1\text={K}_2\)
3. \({K}_1>{K}_2\)
4. \({K}_1<{K}_2\)
Subtopic: Bernoulli's Theorem |
59%
From NCERT
NEET - 2024
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The escape velocity for Earth is \(v.\) A planet having \(9\) times the mass of Earth and a radius, \(16\) times that of Earth, has the escape velocity of:
| 1. | \(\dfrac{v}{3}\) | 2. | \(\dfrac{2v}{3}\) |
| 3. | \(\dfrac{3v}{4}\) | 4. | \(\dfrac{9v}{4}\) |
Subtopic: Escape velocity |
77%
From NCERT
NEET - 2024
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An electron and an alpha particle are accelerated by the same potential difference. Let \(\lambda_\mathrm{e}\) and \(\lambda_\mathrm{\alpha}\) denote the de-Broglie wavelengths of the electron and the alpha particle, respectively, then:
1. \(\lambda_{\mathrm{e}}>\lambda_{\alpha}\)
2. \(\lambda_{\mathrm{e}}=4\lambda_{\alpha}\)
3. \(\lambda_{\mathrm{e}}=\lambda_{\alpha}\)
4. \(\lambda_{\mathrm{e}}<\lambda_{\alpha}\)
1. \(\lambda_{\mathrm{e}}>\lambda_{\alpha}\)
2. \(\lambda_{\mathrm{e}}=4\lambda_{\alpha}\)
3. \(\lambda_{\mathrm{e}}=\lambda_{\alpha}\)
4. \(\lambda_{\mathrm{e}}<\lambda_{\alpha}\)
Subtopic: De-broglie Wavelength |
66%
From NCERT
NEET - 2024
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An object moving along a horizontal \(x\text-\)direction with kinetic energy \(10~\text J\) is displaced through \(x=\left(3\hat{i}\right)\text{m}\) by the force \(\vec{{{F}}}=\left(-2\hat{i}+3\hat{j}\right)~\text N.\) The kinetic energy of the object at the end of the displacement \(x\) is:
| 1. | \(10~\text J\) | 2. | \(16~\text J\) |
| 3. | \(4~\text J\) | 4. | \(6~\text J\) |
Subtopic: Work Energy Theorem |
62%
From NCERT
NEET - 2024
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An object falls from a height of \(10~\text m\) above the ground. After striking the ground it loses \(50\%\) of its kinetic energy. The height up to which the object can re-bounce from the ground is:
| 1. | \(7.5~\text m\) | 2. | \(10~\text m\) |
| 3. | \(2.5~\text m\) | 4. | \(5~\text m\) |
Subtopic: Gravitational Potential Energy |
65%
From NCERT
NEET - 2024
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In the circuit shown below, the inductance \(L\) is connected to a source. The current flowing in the circuit is \({I=I_{0}\sin\omega t.}\) The voltage drop \((V_L)\) across \(L\) is:
1. \(\omega L~I_0\sin\omega t\)
2. \(\frac{{I}_0}{\omega{L}}\sin\omega t\)
3. \(\frac{{I}_0}{\omega{L}}\cos\omega t\)
4. \(\omega L~I_0\cos\omega t\)
1. \(\omega L~I_0\sin\omega t\)
2. \(\frac{{I}_0}{\omega{L}}\sin\omega t\)
3. \(\frac{{I}_0}{\omega{L}}\cos\omega t\)
4. \(\omega L~I_0\cos\omega t\)
Subtopic: Different Types of AC Circuits |
From NCERT
NEET - 2024
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