A metal wire has mass \((0.4\pm 0.002)~\mathrm{g}\), radius \((0.3\pm 0.001)~\mathrm{mm}\) and length \((5\pm 0.02)~\mathrm{cm}\). The maximum possible percentage error in the measurement of density will nearly be:
1. \(1.4 \%\)
2. \(1.2 \%\)
3. \(1.3 \%\)
4. \(1.6 \%\)

Subtopic:  Errors |
From NCERT
NEET - 2023
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The angular acceleration of a body, moving along the circumference of a circle, is:
1. along the axis of rotation
2. along the radius, away from centre
3. along the radius towards the centre
4. along the tangent to its position
Subtopic:  Rotational Motion: Kinematics |
From NCERT
NEET - 2023
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The magnetic energy stored in an inductor of inductance \(4~\mu\text{H}\) carrying a current of \(2~\text{A}\) is:
1. \(8~\mu \text{J}\)
2. \(4~\mu \text{J}\)
3. \(4~\text{mJ}\)
4. \(8~\text{mJ}\)
Subtopic:  Self - Inductance |
 73%
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NEET - 2023
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A full wave rectifier circuit consists of two \(\mathrm{p\text-n}\) junction diodes, a centre-tapped transformer, capacitor and a load resistance. Which of these components remove the ac ripple from the rectified output?
1. load resistance 2. a centre-tapped transformer
3. \(\mathrm{p\text-n}\) junction diodes 4. capacitor
Subtopic:  Rectifier |
 52%
From NCERT
NEET - 2023
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A football player is moving southward and suddenly turns eastward with the same speed to avoid an opponent. The force that acts on the player while turning is:
1. along south-west 2. along eastward
3. along northward 4. along north-east
Subtopic:  Newton's Laws |
 52%
From NCERT
NEET - 2023
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The work functions of Caesium \((\mathrm{Cs})\), Potassium \((\mathrm{K})\) and Sodium \((\mathrm{Na})\) are \(2.14~\text{eV}\), \(2.30~\text{eV}\) and \(2.75~\text{eV}\) respectively. If incident electromagnetic radiation has an incident energy of \(2.20~\text{eV}\). which of these photosensitive surfaces may emit photoelectrons?
1. \(\mathrm{Na}\) only 2. \(\mathrm{Cs}\) only
3. Both \(\mathrm{Na}\) and \(\mathrm{K}\) 4. \(\mathrm{K}\) only
Subtopic:  Photoelectric Effect: Experiment |
 65%
From NCERT
NEET - 2023
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If \(\oint_s \vec{E} \cdot \overrightarrow{d S}=0\) over a surface, then:
 
1. the electric field inside the surface is necessarily uniform.
2. the number of flux lines entering the surface must be equal to the number of flux lines leaving it.
3. the magnitude of electric field on the surface is constant.
4. all the charges must necessarily be inside the surface.
Subtopic:  Gauss's Law |
 78%
From NCERT
NEET - 2023
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Given below are two statements:
Statement I: Photovoltaic devices can convert optical radiation into electricity.
Statement II: Zener diode is designed to operate under reverse bias in the breakdown.
1. Statement I is incorrect but Statement II is correct.
2. Both Statement I and Statement II are correct.
3. Both Statement I and Statement II are incorrect.
4. Statement I is correct but Statement II is incorrect.
Subtopic:  Applications of PN junction |
 74%
From NCERT
NEET - 2023
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In a plane electromagnetic wave travelling in free space, the electric field component oscillates sinusoidally at a frequency of \(2.0\times 10^{10}~ \text{Hz}\) and amplitude \(48~\text{Vm}^{-1}\). Then the amplitude of the oscillating magnetic field is: (Speed of light in free space \(3\times 10^{8}~ \text{ms}^{-1}\))
1. \(1.6 \times 10^{-6} ~\text{T}\)
2. \(1.6 \times 10^{-9} ~\text{T}\)
3. \(1.6 \times 10^{-8} ~\text{T}\)
4. \(1.6 \times 10^{-7} ~\text{T}\)
Subtopic:  Properties of EM Waves |
 58%
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NEET - 2023
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The temperature of a gas is \(-50^\circ \mathrm{C}\). To what temperature the gas should be heated so that the rms speed is increased by \(3\) times?
1. \(223\) \(\text{K}\) 2. \(669^\circ \mathrm{C}\)
3. \(3295^\circ \mathrm{C}\) 4. \(3097\) \(\text{K}\)
Subtopic:  Types of Velocities |
 51%
From NCERT
NEET - 2023
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