When light propagates through a material medium of relative permittivity, \(\epsilon_{r}\) and relative permeability, \(\mu_{r}\) the velocity of light, \(v\) is given by:
(\(c\) = velocity of light in vacuum)
1. \(v=\frac{{c}}{\sqrt{\epsilon_{r} \mu_{{r}}}}\)
2. \(v={c}\)
3. \(v=\sqrt{\frac{\mu_{{r}}}{\epsilon_{{r}}}}\)
4. \(v=\sqrt{\frac{\epsilon_{{r}}}{\mu_{{r}}}}\)

Subtopic:  Properties of EM Waves |
 85%
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NEET - 2022
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A long solenoid of radius \(1~\text{mm}\) has \(100\) turns per mm. If \(1~\text{A}\) current flows in the solenoid, the magnetic field strength at the centre of the solenoid is:
1. \(6.28 \times 10^{-4} ~\text{T} \) 2. \(6.28 \times 10^{-2}~\text{T}\)
3. \(12.56 \times 10^{-2}~\text{T}\) 4. \(12.56 \times 10^{-4} ~\text{T}\)
Subtopic:  Magnetic Field due to various cases |
 63%
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NEET - 2022
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A shell of mass m is at rest initially. It explodes into three fragments having masses in the ratio \(2:2:1\). If the fragments having equal masses fly off along mutually perpendicular directions with speed \(v,\) the speed of the third (lighter) fragment is:
1. \(3 \sqrt{2} v\) 2. \(v\)
3. \(\sqrt{2} v\) 4. \(2 \sqrt{2} v\)
Subtopic:  Linear Momentum |
 69%
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NEET - 2022
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As the temperature increases, the electrical resistance:
1. decreases for conductors but increases for semiconductors
2. increases for both conductors and semiconductors
3. decreases for both conductors and semiconductors
4. increases for conductors but decreases for semiconductors
Subtopic:  Energy Band theory |
 73%
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NEET - 2022
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A biconvex lens has radii of curvature, \(20\) cm each. If the refractive index of the material of the lens is \(1.5,\) the power of the lens is:
1. infinity 2. \(+2\) D
3. \(+20\) D 4. \(+5\) D
Subtopic:  Lenses |
 71%
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NEET - 2022
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Given below are two statements:
Statement I: Biot-Savart's law gives us the expression for the magnetic field strength of an infinitesimal current element \(I(dl)\) of a current-carrying conductor only.
Statement II: Biot-Savart's law is analogous to Coulomb's inverse square law of charge \(q,\) with the former being related to the field produced by a scalar source, \(Idl\) while the latter being produced by a vector source, \(q.\)
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:  Biot-Savart Law |
 52%
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NEET - 2022
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A square loop of side \(1\) m and resistance \(1\) \(\Omega\) is placed in a magnetic field of \(0.5\) T. If the plane of the loop is perpendicular to the direction of the magnetic field, the magnetic flux through the loop is:
1. \(0\) 2. \(2\) weber
3. \(0.5\) weber 4. \(1\) weber
Subtopic:  Magnetic Flux |
 66%
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NEET - 2022
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An electric lift with a maximum load of \(2000\) kg (lift+passengers) is moving up with a constant speed of \(1.5\) ms–1. The frictional force opposing the motion is \(3000\) N. The minimum power delivered by the motor to the lift in watts is: (Take \(g=10\) ms–2)
1. \(23500\) 2. \(23000\)
3. \(20000\) 4. \(34500\)
Subtopic:  Power |
 63%
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NEET - 2022
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A light ray falls on a glass surface of refractive index \(\sqrt{3}\), at an angle of \(60^\circ.\) The angle between the refracted and reflected rays would be:
1. \(120^\circ\) 2. \(30^\circ\)
3. \(60^\circ\) 4. \(90^\circ\)
Subtopic:  Refraction at Plane Surface |
 60%
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NEET - 2022
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A copper wire of length \(10\) m and radius \(\left({10^{-2}/\sqrt{\pi}}\right)\) m has an electrical resistance of \(10~\Omega.\) The current density in the wire for an electric field strength of \(10\) (V/m) is: 
1. \(10^{5}\) A/m2
2. \(10^{4}\) A/m2
3. \(10^{6}\) A/m2
4. \(10^{-5}\) A/m2
Subtopic:  Current & Current Density |
 66%
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NEET - 2022
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