Identify the function which represents a non-periodic motion?
1. \(e^{-\omega t}\) 2. \(\text{sin}\omega t\)
3. \(\text{sin}\omega t+\text{cos}\omega t\) 4. \(\text{sin}(\omega t+\pi/4)\)
Subtopic:  Types of Motion |
 80%
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NEET - 2022
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The magnetic field of a plane electromagnetic wave
is given by, 
\(\vec B=3\times10^{-8}\text{cos}(1.6\times10^3x+48\times10^{10}t)\hat j~\text{T}.\)
The associated electric field will be:
1. \(3 \times 10^{-8} \text{cos}\left(1.6 \times 10^3 x+48 \times 10^{10} t\right) \hat{i}~\text{ V/m}\)
2. \(3 \times 10^{-8} \text{sin} \left(1.6 \times 10^3 {x}+48 \times 10^{10} {t}\right) \hat{{i}}~ \text{V} / \text{m}\)
3. \(9 \text{sin} \left(1.6 \times 10^3 {x}-48 \times 10^{10} {t}\right) \hat{{k}} ~~\text{V} / \text{m}\)
4. \(9 \text{cos} \left(1.6 \times 10^3 {x}+48 \times 10^{10} {t}\right) \hat{{k}}~~\text{V} / \text{m}\)
Subtopic:  Properties of EM Waves |
 56%
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NEET - 2022
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The incorrect statement about the property of a Zener diode is:
1. Zener voltage remains constant at the breakdown.
2. It is designed to operate under reverse bias.
3. The depletion region formed is very wide.
4. \(\mathrm{p}\) and \(\mathrm{n}\) regions of the Zener diode are heavily doped.
Subtopic:  Applications of PN junction |
 53%
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NEET - 2022
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A cell of emf  \(4~\text{V}\) and internal resistance \(0.5~\Omega\) is connected to a \(7.5~\Omega\) external resistance. The terminal potential difference of the cell is:
1. \(3.75~\text{V}\) 2. \(4.25~\text{V}\)
3. \(4~\text{V}\) 4. \(0.375~\text{V}\)
Subtopic:  EMF & Terminal Voltage |
 70%
From NCERT
NEET - 2022
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Given below are two statements:
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 \(\pi.\)
 
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 |
 68%
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. \((1+\sqrt5)~\Omega\)
Subtopic:  Combination of Resistors |
 52%
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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
Subtopic:  Projectile Motion |
 73%
From NCERT
NEET - 2022
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A closely packed coil having \(1000\) turns has an average radius of \(62.8 ~\text{cm}\). If the current carried by the wire of the coil is \(1~ \text{A},\) the value of the magnetic field produced at the centre of the coil will be nearly:
(permeability of free space = \(4 \pi \times 10^{-7}~ \text{H/m}\))
1. \(10^{-1}~\text{T}\) 2. \(10^{-2}~\text T\)
3. \(10^{2}~\text T\) 4. \(10^{-3}~\text{T}\)
Subtopic:  Magnetic Field due to various cases |
 62%
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An inductor of inductance \(2~\text{mH}\) is connected to a \(220~\text{V}\), \(50~\text{Hz}\) ac source. Let the inductive reactance in the circuit is \(X_1\). If a \(220~\text{V}\) DC source replaces the AC source in the circuit, then the inductive reactance in the circuit is \(X_2\). \(X_1\) and \(X_2\), respectively, are:
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 |
 67%
From NCERT
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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 |
 66%
From NCERT
NEET - 2022
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