A charged particle having drift velocity of 7.5× 10^-4 m/s in an electric field of 3×10^-10V/m, has mobility in m^2 V^-1 s^-1

 [NEET-2020 ] a. 2.25×10^15      b. 25×10^6      c. 2.5×19^-6        d. 2.25 ×10^-15

Two bodies of mass 4 kg and 6 kg are tied to the ends of a massless string. The string passes over a pulley which is frictionless. The acceleration of the system in terms of acceleration due to gravity (g) is :

  (a) g           (b) g/2           (c) g/5           (d) g/10

Dimensions of stress are

 [ NEET 2020 ]                                     

In Young’s double slit experiment, if the separation between coherent sources is halved and the distance of the screen from the coherent sources is doubled, then the fringe width becomes :

 [NEET 2020] (a) double (b) half (c) four times (d) one-fourth

A Wire Of Length L, Area Of Cross Section A Is Hanging From A Fixed Support. The Length Of The Wire Changes To L1 When Mass M Is Suspended From Its Free End. The Expression For Young’s Modulus Is :

 (a) MgL1  / AL (b) Mg(L1 -L)/ AL (c) MgL / AL1 (d) MgL / A(L1 -L)

In A Guitar, Two Strings A And B Made Of Same Material Are Slightly Out Of Tune And Produce Beats Of Frequency 6 Hz. When Tension In B Is Slightly Decreased, The Beat Frequency Increases To 7 Hz. If The Frequency Of A Is 530 Hz, The Original Frequency Of B Will Be

 [NEET-2020] (a) 523 Hz      (b) 524 Hz      (c) 536 Hz     (d) 537 Hz

A 40 Micro Farad Capacitor Is Connected To A 200 V, 50 Hz Ac Supply. The Rms Value Of The Current In The Circuit Is, Nearly

 [ NEET 2020] (a) 1.7 A                               (b) 2.05 A (c) 2.5 A                               (d) 25.1 A

A Spherical Conductor Of Radius 10 Cm Has A Charge Of 3.2 × 10–7 C Distributed Uniformly. What Is The Magnitude Of Electric Field At A Point 15 Cm From The Centre Of The Sphere?