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?

   

LIGHT WITH AN AVERAGE FLUX OF 20 W/m^2 FALLS ON A NON-REFLECTING SURFACE AT NORMAL INCIDENCE HAVING SURFACE AREA 20 m^2. THE ENERGY RECEIVED BY THE SURFACE DURING TIME SPAN OF 1 MINUTE IS :

                             

FIND THE TORQUE ABOUT THE ORIGIN WHEN A FORCE OF 3j ̂ N ACTS ON A PARTICLE WHOSE POSITION VECTOR IS 2k ̂ M .

[NEET - 2020]  \[(a) 6\widehat{i} Nm\] \[(b) 6\widehat{j} Nm\] \[(c) -6\widehat{i} Nm\] \[(d) 6\widehat{k} Nm\] Solution:

THE PHASE DIFFERENCE BETWEEN DISPLACEMENT AND ACCELERATION OF A PARTICLE IN A SIMPLE HARMONIC MOTION IS

 [NEET - 2020] \[(a)\pi rad\] \[(b)\frac{3\pi}{2} rad\] \[(c)\frac{\pi}{2} rad\] \[(d)zero\] Solution: Equation for SHM is

A BODY WEIGHS 72 N ON THE SURFACE OF THE EARTH. WHAT IS THE GRAVITATIONAL FORCE ON IT, AT A HEIGHT EQUAL TO HALF THE RADIUS OF THE EARTH?

 [NEET - 2020] (a) 48 N (b) 32 N (c) 30 N 4) 24 N

THE ENERGY EQUIVALENT OF 0.5g OF A SUBSTANCE IS ?

[NEET 2020]  (a) 4.5 × 10 16 J (b) 4.5 × 10 13 J (c) 1.5 × 10 13 J (d) 0.5 × 10 13 J

A RAY IS INCIDENT AT AN ANGLE OF INCIDENCE I ON ONE SURFACE OF A SMALL ANGLE PRISM (WITH ANGLE OF PRISM A) AND EMERGES NORMALLY FROM THE OPPOSITE SURFACE. IF THE REFRACTIVE INDEX OF THE MATERIAL OF THE PRISM IS μ, THEN THE ANGLE OF INCIDENCE IS NEARLY EQUAL TO

NEET 2020 a) \[\frac{A}{2\mu}\] b) \[\frac{2A}{\mu}\] c)\[{\mu A}\] d)\[\frac{\mu A}{2}\] Diagram: A RAY IS EMERGES NORMALLY FROM ENERGENT S...

A cylinder contains hydrogen gas at pressure of 249 kPa and temperature 27°C. Its density is

 Given: (R = 8.3 Jmol –1 K –1 ) (a)     0.5 kg/m 3         (b)0.2 kg/ m 3        (c)0.1 kg/ m 3                (d)0.02 kg/ m 3   A cylinde...

THE BREWSTER’S ANGLE IB FOR AN INTERFACE SHOULD BE

(a) 0° < i b <30° (b) 30° < i b <45° (c) 45° < i b <90° (d) i b = 90°   Brewster’s law:

FOR WHICH ONE OF THE FOLLOWING, BOHR MODEL IS NOT VALID ?

 (a) Hydrogen atom             (b) Singly ionised helium atom (He+)               (c) Deuteron atom                (d) Singly ionised neon...

A screw gauge has least count of 0.01 mm and there are 50 divisions in its circular scale. The pitch of the screw gauge is :

(A) 0.01 mm        (2) 0.25 mm          (3) 0.5 mm            (4) 1.0 mm A micrometer screw gauge, is a device which is used measure the dim...