The current in an inductor of self-inductance \(4~\mathrm{H}\) changes from \(4~ \mathrm{A}\) to \(2~\mathrm{A}\) in \(1~ \mathrm s\) . The emf induced in the coil is:
1. \(-2~\mathrm V\)
2. \(2~\mathrm V\)
3. \(-4~\mathrm V\)
4. \(8~\mathrm V\)

Subtopic:  Self - Inductance |
 81%
From NCERT
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The correct statement about the variation of viscosity of fluids with an increase in temperature is:

1. viscosity of gases decreases.
2. viscosity of both liquids and gases increases.
3. viscosity of liquids increases.
4. viscosity of liquids decreases.
Subtopic:  Viscosity |
 73%
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The de-Broglie wavelength of the thermal electron at \(27^\circ \text{C}\) is \(\lambda.\) When the temperature is increased to \(927^\circ \text{C},\) its de-Broglie wavelength will become:
1. \(2\lambda\)
2. \(4\lambda\)
3. \(\frac\lambda2\)
4. \(\frac\lambda4\)

Subtopic:  De-broglie Wavelength |
 60%
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Assuming the earth to be a sphere of uniform density, its acceleration due to gravity acting on a body:

1. increases with increasing altitude.
2. increases with increasing depth.
3. is independent of the mass of the earth.
4. is independent of the mass of the body.
Subtopic:  Acceleration due to Gravity |
 68%
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A particle of mass \(4M\) kg at rest splits into two particles of mass \(M\) and \(3M.\) The ratio of the kinetic energies of mass \(M\) and \(3M\) would be:

1. \(3:1\) 2. \(1:4\)
3. \(1:1\) 4. \(1:3\)
Subtopic:  Collisions |
 62%
From NCERT
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During simple harmonic motion of a body, the energy at the extreme position is:

1.  both kinetic and potential
2. is always zero
3. purely kinetic
4. purely potential
Subtopic:  Energy of SHM |
 77%
From NCERT
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A fluid of density \(\rho~\)is flowing in a pipe of varying cross-sectional area as shown in the figure. Bernoulli's equation for the motion becomes:
              
1.  \(p+\frac12\rho v^2+\rho gh\text{=constant}\)
2. \(p+\frac12\rho v^2\text{=constant}\)
3. \(\frac12\rho v^2+\rho gh\text{=constant}\)
4. \(p+\rho gh\text{=constant}\)

Subtopic:  Bernoulli's Theorem |
 88%
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The ratio of the moments of inertia of two spheres about their diameter and having same mass and their radii in the ratio of \(1:2\) is:
1. \(2:1\)
2. \(4:1\)
3. \(1:2\)
4. \(1:4\)

Subtopic:  Moment of Inertia |
 80%
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Assertion (A): A standing bus suddenly accelerates. If there was no friction between the feet of a passenger and the floor of the bus, the passenger would move back.
Reason (R): In the absence of friction, the floor of the bus would slip forward under the feet of the passenger.
 
1. (A) is true but (R) is false.
2. (A) is false but (R) is true.
3. Both (A) and (R) are true and (R) is the correct explanation of (A).
4. Both (A) and (R) are true but (R) is not the correct explanation of (A).
Subtopic:  Newton's Laws |
 61%
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A linearly polarized monochromatic light of intensity \(10\) lumen is incident on a polarizer. The angle between the direction of polarization of the light and that of the polarizer such that the intensity of output light is \(2.5\) lumen is:

1. \(60^\circ\) 2. \(75^\circ\)
3. \(30^\circ\) 4. \(45^\circ\)
Subtopic:  Polarization of Light |
 65%
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