Polar molecules are the molecules:

1. that acquires a dipole moment only when the magnetic field is absent.
2. has a permanent electric dipole moment.
3. has zero dipole moment.
4. that acquire a dipole moment only in the presence of an electric field due to displacement of charges.
Subtopic:  Electric Dipole |
 64%
From NCERT
NEET - 2021
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A particle is released from a height of \(S\) above the surface of the earth. At a certain height, its kinetic energy is three times its potential energy. The distance from the earth's surface and the speed of the particle at that instant are respectively: 
1. \({S \over 2},{ \sqrt{3gS} \over 2}\) 2. \({S \over 4}, \sqrt{3gS \over 2}\)
3. \({S \over 4},{ {3gS} \over 2}\) 4. \({S \over 4},{ \sqrt{3gS} \over 3}\)
Subtopic:  Gravitational Potential Energy |
 69%
From NCERT
NEET - 2021
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Match Column I and Column II with appropriate relations.

Column I Column II
(A) Drift Velocity (P) \(\frac{ \mathrm{m}}{\mathrm{ne}^2 \rho}\)
(B) Electrical Resistivity (Q) \(nev_d\)
(C) Relaxation Period (R) \(\frac{ \mathrm{eE}}{\mathrm{m}} \tau\)
(D) Current Density (S) \(\frac{E}{J}\)
 
(A) (B) (C) (D)
1. (R) (P) (S) (Q)
2. (R) (Q) (S) (P)
3. (R) (S) (P) (Q)
4. (R) (S) (Q) (P)
Subtopic:  Current & Current Density |
 54%
From NCERT
NEET - 2021
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If force \([F]\), acceleration \([A]\) and time \([T]\) are chosen as the fundamental physical quantities, then find the dimensions of energy:
1. \(\left[FAT^{-1}\right]\)
2. \(\left[FA^{-1}T\right]\)
3. \(\left[FAT\right]\)
4. \(\left[FAT^{2}\right]\)

Subtopic:  Dimensions |
 64%
From NCERT
NEET - 2021
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The escape velocity from the Earth's surface is \(v\). The escape velocity from the surface of another planet having a radius, four times that of Earth and the same mass density is: 

1. \(3v\) 2. \(4v\)
3. \(v\) 4. \(2v\)
Subtopic:  Escape velocity |
 59%
From NCERT
NEET - 2021
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A small block slides down on a smooth inclined plane starting from rest at time \(t=0.\) Let \(S_n\) be the distance traveled by the block in the interval \(t=n-1\) to \(t=n.\) Then the ratio \(\dfrac{S_n}{S_{n +1}}\) is:

1. \(\dfrac{2n+1}{2n-1}\) 2. \(\dfrac{2n}{2n-1}\)
3. \(\dfrac{2n-1}{2n}\) 4. \(\dfrac{2n-1}{2n+1}\)
Subtopic:  Uniformly Accelerated Motion |
 57%
From NCERT
NEET - 2021
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The velocity of a small ball of mass \(M\) and density \(d\), when dropped in a container filled with glycerine becomes constant after some time. If the density of glycerine is \(d\over 2\) then the viscous force acting on the ball will be:

1. \(\frac{3Mg}{2}\) 2. \(2Mg\)
3. \(\frac{Mg}{2}\) 4. \(Mg\)
Subtopic:  Viscosity |
 60%
From NCERT
NEET - 2021
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A thick current-carrying cable of radius '\(R\)' carries current \('I'\) uniformly distributed across its cross-section. The variation of magnetic field \(B(r)\) due to the cable with the distance '\(r\)' from the axis of the cable is represented by:

1.   2.
3. 4.
Subtopic:  Ampere Circuital Law |
 80%
From NCERT
NEET - 2021
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Find the value of the angle of emergence from the prism given below for the incidence ray shown. The refractive index of the glass is \(\sqrt{3}\).

       

1. \(45^{\circ}\)
2. \(90^{\circ}\)
3. \(60^{\circ}\)
4. \(30^{\circ}\)

Subtopic:  Prisms |
 56%
From NCERT
NEET - 2021
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A screw gauge gives the following readings when used to measure the diameter of a wire:
Main scale reading: \(0\) mm
Circular scale reading: \(52\) divisions 
Given that \(1\) mm on the main scale corresponds to \(100\) divisions on the circular scale, the diameter of the wire that can be inferred from the given data is:
1. \(0.26\) cm 
2. \(0.052\) cm 
3. \(0.52\) cm 
4. \(0.026\) cm 

Subtopic:  Measurement & Measuring Devices |
 67%
From NCERT
NEET - 2021
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