# The net magnetic flux through any closed surface is: 1. negative 2. zero 3. positive 4. infinity

Subtopic:  Analogy between Electrostatics & Magnetostatics |
82%
From NCERT
NEET - 2023
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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%
From NCERT
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%
From NCERT
NEET - 2023