A metallic bar of Young's modulus \(0.5 \times 10^{11}~\text{Nm}^{-2},\) coefficient of linear thermal expansion \(10^{-5} ~^{\circ}\text{C}^{-1},\) length \(1~\text m\) and cross-sectional area \(10^{-3} ~\text{m}^2\) is heated from \(0^\circ \text{C}\) to \(100^\circ \text C\) without expansion or bending. The compressive force developed in the metallic bar is:
1. \(50 \times 10^3~ \text N\)
2. \(100 \times 10^3 ~\text N\)
3. \(2 \times 10^3~\text N\)
4. \(5 \times 10^3 ~\text N\)
Subtopic: Thermal Stress |
71%
From NCERT
NEET - 2024
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A parallel plate capacitor is charged by connecting it to a battery through a resistor. If \(i\) is the current in the circuit, then in the gap between the plates:
| 1. | displacement current of magnitude equal to \(i\) flows in the same direction as \(i\). |
| 2. | displacement current of magnitude equal to \(i\) flows in a direction opposite to that of \(i\). |
| 3. | displacement current of magnitude greater than \(i\) flows but can be in any direction. |
| 4. | there is no current. |
Subtopic: Displacement Current |
53%
From NCERT
NEET - 2024
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Subtopic: PN junction |
From NCERT
NEET - 2024
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A sheet is placed on a horizontal surface in front of a strong magnetic pole. A force is needed to:
Choose the correct statement\((\mathrm s )\) from the options given below:
1. \(\mathrm A\) and \(\mathrm C\) only
2. \(\mathrm A\), \(\mathrm C\) and \(\mathrm D\) only
3. \(\mathrm C\) only
4. \(\mathrm B\) and \(\mathrm D\) only
| \(\mathrm A.\) | hold the sheet there if it is magnetic. |
| \(\mathrm B.\) | hold the sheet there if it is non-magnetic. |
| \(\mathrm C.\) | move the sheet away from the pole with uniform velocity if it is conducting. |
| \(\mathrm D.\) | move the sheet away from the pole with uniform velocity if it is both, non-conducting and non-polar. |
1. \(\mathrm A\) and \(\mathrm C\) only
2. \(\mathrm A\), \(\mathrm C\) and \(\mathrm D\) only
3. \(\mathrm C\) only
4. \(\mathrm B\) and \(\mathrm D\) only
Subtopic: Faraday's Law & Lenz Law |
From NCERT
NEET - 2024
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If the plates of a parallel plate capacitor connected to a battery are moved close to each other, then:
Choose the most appropriate answer from the options given below:
1. \(\mathrm {A,C}\) and \(\mathrm E\) only
2. \(\mathrm {B,D }\) and \(\mathrm E\) only
3. \(\mathrm{A,B}\) and \(\mathrm C\) only
4. \(\mathrm{A,B}\) and \(\mathrm E\) only
| \(\mathrm A.\) | the charge stored in it, increases. |
| \(\mathrm B.\) | the energy stored in it, decreases. |
| \(\mathrm C.\) | its capacitance increases. |
| \(\mathrm D.\) | the ratio of charge to its potential remains the same. |
| \(\mathrm E.\) | the product of charge and voltage increases. |
Choose the most appropriate answer from the options given below:
1. \(\mathrm {A,C}\) and \(\mathrm E\) only
2. \(\mathrm {B,D }\) and \(\mathrm E\) only
3. \(\mathrm{A,B}\) and \(\mathrm C\) only
4. \(\mathrm{A,B}\) and \(\mathrm E\) only
Subtopic: Energy stored in Capacitor |
55%
From NCERT
NEET - 2024
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The following graph represents the \(T\text -V\) curves of an ideal gas (where \(T\) is the temperature and \(V\) the volume) at three pressures \(P_1, P_2\) and \(P_3\) compared with those of Charles's law represented as dotted lines.
Then the correct relation is :
Then the correct relation is :
| 1. | \(P_1>P_3>P_2 \) | 2. | \(P_2>P_1>P_3 \) |
| 3. | \( P_1>P_2>P_3\) | 4. | \(P_3 > P_2>P_1\) |
Subtopic: Ideal Gas Equation |
62%
From NCERT
NEET - 2024
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The property which is not of an electromagnetic wave travelling in free space is that:
| 1. | the energy density in electric field is equal to energy density in magnetic field. |
| 2. | they travel with a speed equal to \(\dfrac{1}{\sqrt{\mu_0~ \varepsilon_0}} .\) |
| 3. | they originate from charges moving with uniform speed. |
| 4. | they are transverse in nature. |
Subtopic: Properties of EM Waves |
62%
From NCERT
NEET - 2024
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An iron bar of length \(\mathrm L\) has magnetic moment \(\mathrm M.\) It is bent at the middle of its length such that the two arms make an angle \(60^\circ\) with each other. The magnetic moment of this new magnet is:
1. \( \mathrm M \over 2\)
2. \( \mathrm {2 M}\)
3. \(\)\(\frac{\mathrm{M}}{\sqrt{3}}\)
4. \(\mathrm M\)
1. \( \mathrm M \over 2\)
2. \( \mathrm {2 M}\)
3. \(\)\(\frac{\mathrm{M}}{\sqrt{3}}\)
4. \(\mathrm M\)
Subtopic: Bar Magnet |
From NCERT
NEET - 2024
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If the mass of the bob in a simple pendulum is increased to thrice its original mass and its length is made half its original length, then the new time period of oscillation is \( \dfrac{x}{2}\) times its original time period. Then the value of \(x\) is:
1. \(\sqrt2\)
2. \(2\sqrt3\)
3. \(4\)
4. \(\sqrt3\)
1. \(\sqrt2\)
2. \(2\sqrt3\)
3. \(4\)
4. \(\sqrt3\)
Subtopic: Angular SHM |
62%
From NCERT
NEET - 2024
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The reagents with which glucose does not reason to give the corresponding test/products are:
A. Tollen's reagent
B. Schiff's reagent
C. \(\text{HCN}\)
D. \(\text{NH}_2\text{OH}\)
E. \(\text{NaHSO}_3\)
Choose the correct options from the given below:-
A. Tollen's reagent
B. Schiff's reagent
C. \(\text{HCN}\)
D. \(\text{NH}_2\text{OH}\)
E. \(\text{NaHSO}_3\)
Choose the correct options from the given below:-
| 1. | \(\text{A}\) and \(\text{D}\) | 2. | \(\text{B}\) and \(\text{E}\) |
| 3. | \(\text{E}\) and \(\text{D}\) | 4. | \(\text{B}\) and \(\text{C}\) |
Subtopic: Carbohydrates - Classification & D-L configuration |
63%
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NEET - 2024
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