Identify the function which represents a non-periodic motion.
1. \(e^{-\omega t}\)
2. \(sin\omega t\)
3. \(sin\omega t+cos\omega t\)
4. \(sin(\omega t+\pi/4)\)
1. \(e^{-\omega t}\)
2. \(sin\omega t\)
3. \(sin\omega t+cos\omega t\)
4. \(sin(\omega t+\pi/4)\)
Subtopic: Types of Motion |
77%
From NCERT
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The magnetic field of a plane electromagnetic wave
is given by,
\(\vec B=3\times10^{-8}cos(1.6\times10^3x+48\times10^{10}t)\hat j~T.\)
The associated electric field will be:
is given by,
\(\vec B=3\times10^{-8}cos(1.6\times10^3x+48\times10^{10}t)\hat j~T.\)
The associated electric field will be:
| 1. | \(3 \times 10^{-8} \cos \left(1.6 \times 10^3 x+48 \times 10^{10} t\right) \hat{i}~\text{ V/m}\) |
| 2. | \(3 \times 10^{-8} \sin \left(1.6 \times 10^3 \mathrm{x}+48 \times 10^{10} \mathrm{t}\right) \hat{\mathrm{i}}~ \mathrm{V} / \mathrm{m}\) |
| 3. | \(9 \sin \left(1.6 \times 10^3 \mathrm{x}-48 \times 10^{10} \mathrm{t}\right) \hat{\mathrm{k}} ~~\mathrm{V} / \mathrm{m}\) |
| 4. | \(9 \cos \left(1.6 \times 10^3 \mathrm{x}+48 \times 10^{10} \mathrm{t}\right) \hat{\mathrm{k}}~~\mathrm{V} / \mathrm{m}\) |
Subtopic: Properties of EM Waves |
From NCERT
NEET - 2022
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The incorrect statement about the property of a zener diode is:
| 1. | zener voltage remains constant at breakdown |
| 2. | it is designed to operate under reverse bias |
| 3. | depletion region formed is very wide |
| 4. | p and n regions of zener diode are heavily doped |
Subtopic: Applications of PN junction |
From NCERT
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A cell of emf \(4\) V and internal resistance \(0.5~\Omega\) is connected to a \(7.5~\Omega\) external resistance. The terminal potential difference of the cell is:
1. \(3.75\) V
2. \(4.25\) V
3. \(4\) V
4. \(0.375\) V
1. \(3.75\) V
2. \(4.25\) V
3. \(4\) V
4. \(0.375\) V
Subtopic: EMF & Terminal Voltage |
68%
From NCERT
NEET - 2022
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Given below are two statements:
In light of the above statements, choose the most appropriate answer from the options given below:
| Statement-I: | In an ac circuit, the current through a capacitor leads the voltage across it. |
| Statement-II: | In ac circuits containing pure capacitance only, the phase difference between the current and the voltage is \(\pi.\) |
In light of the above statements, choose the most appropriate answer from the options given below:
| 1. | Both Statement-I and Statement-II are correct. |
| 2. | Both Statement-I and Statement-II are incorrect. |
| 3. | Statement-I is correct but Statement-II is incorrect. |
| 4. | Statement-I is incorrect but Statement-II is correct. |
Subtopic: Different Types of AC Circuits |
63%
From NCERT
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The equivalent resistance of the infinite network given below is:
1. \(2~\Omega\)
2. \((1+\sqrt2)~\Omega\)
3. \((1+\sqrt3)~\Omega\)
4. \((1+\sqrt5)~\Omega\)
1. \(2~\Omega\)
2. \((1+\sqrt2)~\Omega\)
3. \((1+\sqrt3)~\Omega\)
4. \((1+\sqrt5)~\Omega\)
Subtopic: Combination of Resistors |
From NCERT
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A cricket ball is thrown by a player at a speed of \(20\) m/s in a direction \(30^\circ\) above the horizontal. The maximum height attained by the ball during its motion is: (Take \(g=10\) m/s2)
1. \(5\) m
2. \(10\) m
3. \(20\) m
4. \(25\) m
1. \(5\) m
2. \(10\) m
3. \(20\) m
4. \(25\) m
Subtopic: Projectile Motion |
69%
From NCERT
NEET - 2022
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A closely packed coil having 1000 turns has an average radius of \(62.8 ~\mathrm{cm}\). If current carried by the wire of the coil is \(1~ A,\) the value of magnetic field produced at the centre of the coil will be:
(permeability of free space = \(4 \pi \times 10^{-7}~ \mathrm{H/m}\) ) nearly:
(permeability of free space = \(4 \pi \times 10^{-7}~ \mathrm{H/m}\) ) nearly:
| 1. | \(10^{-1}~\mathrm T\) | 2. | \(10^{-2}~\mathrm T\) |
| 3. | \(10^{2}~\mathrm T\) | 4. | \(10^{-3}~\mathrm T\) |
Subtopic: Magnetic Field due to various cases |
58%
From NCERT
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An inductor of inductance 2 mH is connected to a 220 V, 50 Hz ac source. Let the inductive reactance in the circuit is X1. If a 220 V dc source replaces the ac source in the circuit, then the inductive reactance in the circuit is X2. X1 and X2 , respectively, are:
1. 6.28 \(\Omega\), zero
2. 6.28 \(\Omega\), infinity
3. 0.628 \(\Omega\), zero
4. 0.628 \(\Omega\), infinity
1. 6.28 \(\Omega\), zero
2. 6.28 \(\Omega\), infinity
3. 0.628 \(\Omega\), zero
4. 0.628 \(\Omega\), infinity
Subtopic: Different Types of AC Circuits |
62%
From NCERT
NEET - 2022
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During a cloudy day, a primary and a secondary rainbow may be created. Which of the following statement is correct?
| 1. | primary rainbow is due to double internal reflection and is formed above the secondary one. |
| 2. | primary rainbow is due to double internal reflection and is formed below the secondary one. |
| 3. | secondary rainbow is due to double internal reflection and is formed above the primary one. |
| 4. | secondary rainbow is due to a single internal reflection and is formed above the primary one. |
Subtopic: Total Internal Reflection |
65%
From NCERT
NEET - 2022
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