If the temperature of black body is increased by a factor of 2, the amount of energy and volume radiated increases by a factor of

( a ) 2               ( b ) 4               ( c ) 8               ( d ) 16 A black body is 

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...

IN AN EXPERIMENT, THE PERCENTAGE ERROR OCCURRED IN THE MEASUREMENT OF A PHYSICAL QUANTITIES ‘A’, ‘B’, ‘C’ & ‘D’ ARE 1%, 2%, 3% & 4 % RESPECTIVELY THEN THE MAXIMUM PERCENTAGE OF ERROR IN THE MEASUREMENT OF ‘X’,

 WHERE, \[X= \frac{A^{2}B^{\frac{1}{2}}}{C^{\frac{1}{3}D^{3}}}\] UNIT OF THERMAL CONDUCTIVITY IS [NEET 2019] a. J m k -1    b. J m -1 k...

WHAT IS THE ANGULAR DISPLACEMENT OF A MINUTE HAND IN 20 MNUTES?

a. 2.095 rad b. 3.125 rad c. 1.12 rad d. 5.421 rad Solution:

If the temperature of black body is increased by a factor of 2, the amount of energy and volume radiated increases by a factor of . . . . . . . . . .

  ( a ) 2               ( b ) 4               ( c ) 8               ( d ) 16   Definition A black body is a theoretical object that ab...

Two concentric sphere kept in air have radii R & r . they have similar change and equal charge density σ. The electric potential at their common centre is? ( MHT - CET ~ 2014 )

  \[ a ) \frac { \sigma (R + r) } { \epsilon _{ o } } \]    \[ b ) \frac { \sigma (R - r) } { \epsilon _{ o } } \]    \[ c ) \frac { \si...

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...

The angle between vector ( i + j ) and ( j + k ) is ( in Radian )

  solution :    - Let us consider A = i + j B = j + k To find out the  angle between the two vectors we must have to find out the dot ( scal...

HOW TO CALCULATE THE DIMENSIONS OF POWER?

Power can be defined as the work done per unit time. Mathematically, 

HOW TO CALCULATE THE DIMENSIONS OF FORCE?

To calculate the dimensions of the force , first we have to consider the formula of force. 

HOW TO CALCULATE THE DIMENSIONS OF DENSITY?

we know that 

Calculate the angular velocity and linear velocity of a tip of minute hand of length 10 cm.

  Calculate the angular velocity and linear velocity of a tip of minute hand of length 10 cm.   Solution