The maximum elongation of a steel wire of \(1~\text m\) length if the elastic limit of steel and its Young's modulus, respectively, are \(8 × 10^8 ~\text{N m}^{-2 }\) and \(2 × 10^{11} ~\text{N m}^{-2},\) is:
1. \(0.4~\text{mm}\)
2. \(40~\text{mm}\)
3. \(8~\text{mm}\)
4. \(4~\text{mm}\)
Subtopic: Young's modulus |
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From NCERT
NEET - 2024
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Consider the following Statements A and B and identify the correct answer:
| A. | For a solar-cell, the \(I\text-V\) characteristics lies in the IV quadrant of the given graph. |
| B. | In a reverse-biased pn junction diode, the current measured in (\(\mu \text{A}\)), is due to majority charge carriers. |
| 1. | A is incorrect but B is correct. |
| 2. | Both A and B are correct. |
| 3. | Both A and B are incorrect. |
| 4. | A is correct but B is incorrect. |
Subtopic: Applications of PN junction |
From NCERT
NEET - 2024
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A particle moving with uniform speed in a circular path maintains:
| 1. | constant acceleration. |
| 2. | constant velocity but varying acceleration. |
| 3. | varying velocity and varying acceleration. |
| 4. | constant velocity. |
Subtopic: Circular Motion |
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From NCERT
NEET - 2024
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If \(c\) is the velocity of light in free space, the correct statements about photon among the following are:
Choose the correct answer from the options given below:
1. \(\text {A, B, C}\) and \(\text {D}\) only
2. \(\text {A, C}\) and \(\text {D}\) only
3. \(\text {A, B, D}\) and \(\text {E}\) only
4. \(\text {A}\) and \(\text {B}\) only
| A. | The energy of a photon is \(E=h\nu.\) |
| B. | The velocity of a photon is \(c.\) |
| C. | The momentum of a photon, \(p={\dfrac{h\nu}{c}}.\) |
| D. | In a photon-electron collision, both total energy and total momentum are conserved. |
| E. | Photon possesses positive charge. |
1. \(\text {A, B, C}\) and \(\text {D}\) only
2. \(\text {A, C}\) and \(\text {D}\) only
3. \(\text {A, B, D}\) and \(\text {E}\) only
4. \(\text {A}\) and \(\text {B}\) only
Subtopic: Particle Nature of Light |
56%
From NCERT
NEET - 2024
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Two bodies \(A\) and \(B\) of same mass undergo completely inelastic one dimensional collision. The body \(A\) moves with velocity \(v_1\) while body \(B\) is at rest before collision. The velocity of the system after collision is \(v_2\). The ratio \(v_1:v_2\) is:
1. \(2:1\)
2. \(4:1\)
3. \(1:4\)
4. \(1:2\)
1. \(2:1\)
2. \(4:1\)
3. \(1:4\)
4. \(1:2\)
Subtopic: Collisions |
62%
From NCERT
NEET - 2024
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The graph which shows the variation of \(\bigg({\dfrac{1}{\lambda^2}}\bigg)\) and its kinetic energy, \(E\) is (where \(\lambda\) is de-Broglie wavelength of a free particle):
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: De-broglie Wavelength |
52%
From NCERT
NEET - 2024
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An unpolarised light beam strikes a glass surface at Brewster's angle. Then:
| 1. | the refracted light will be completely polarised. |
| 2. | both the reflected and refracted light will be completely polarised. |
| 3. | the reflected light will be completely polarised but the refracted light will be partially polarised. |
| 4. | the reflected light will be partially polarised. |
Subtopic: Polarization of Light |
59%
From NCERT
NEET - 2024
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At any instant of time \(t\), the displacement of any particle is given by \(2t-1\) (SI unit) under the influence of force of \(5~\text N\). The value of instantaneous power is (in SI unit):
1. \(5\)
2. \(7\)
3. \(6\)
4. \(10\)
1. \(5\)
2. \(7\)
3. \(6\)
4. \(10\)
Subtopic: Power |
72%
From NCERT
NEET - 2024
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A tightly wound \(100\) turns coil of radius \(10~\text{cm}\) carries a current of \(7~\text A\). The magnitude of the magnetic field at the centre of the coil is: (Take permeability of free space as \(4 \pi \times 10^{-7}\)SI units):
1. \(4.4~\text T\)
2. \(4.4~\text {mT}\)
3. \(44~\text T\)
4. \(44~\text {mT}\)
1. \(4.4~\text T\)
2. \(4.4~\text {mT}\)
3. \(44~\text T\)
4. \(44~\text {mT}\)
Subtopic: Magnetic Field due to various cases |
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From NCERT
NEET - 2024
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The moment of inertia of a thin rod about an axis passing through its mid point and perpendicular to the rod is \(2400 ~\text{g cm}^2.\) The length of the \(400~\text{g}\) rod is nearly:
| 1. | \(17.5~\text{cm}\) | 2. | \(20.7~\text{cm}\) |
| 3. | \(72.0~\text{cm}\) | 4. | \(8.5~\text{cm}\) |
Subtopic: Moment of Inertia |
57%
From NCERT
NEET - 2024
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