Two waves travelling in same direction and having same frequency , it will give ………… , A ) superposition , B ) interference , C ) beats , D ) None of these ,

1) Two waves travelling in same direction and having same frequency , it will give ………… ,

A ) superposition ,                                    B ) interference ,

C ) beats ,                                                  D ) None of these ,

Correct Answer : -  B ) interference ,

 

2 ) Velocity of sound in vacuum is …………. ,

A ) 0 m/s ,                                        B ) 100 m/s ,

C ) Infinite ,                                                D ) None of these ,

Correct Answer : -  A ) 0 m/s ,

 

3 ) He – Ne  laser is a gas laser .

 

4 ) Adiabatic change : -  (P)(V)^r = constant .

 

5 ) 1 gm/cm3  =  ( ? ) kg/m2  .

A ) 10^2  ,                                                  B ) 10^3  ,

C ) 10^4  ,                                                           D ) None of these ,

Correct Answer : -  B ) 10^3  ,

Solution : -

gm = gram meter  =  10^(-3) kg m , 

cm3 = { 10^(-2) m }^3  = {10^(-6)} m3  ,

so ,

1 gm/cm3  =  {10^(-3) kgm} / {10^(-6)} m3  ,

1 gm/cm3  = 10^3  kg/m2 ,   Answer .

 

6 ) Doppler shift in frequency is …………….. of distance from source to observer .

A ) dependent ,                                         B ) independent ,

C ) not effected ,                                      D ) None of these ,

Correct Answer : -   B ) independent ,

 

7 ) ………… process occurs at constant heat or entropy .

A ) Adiabatic ,                                           B ) Isothermal ,

C ) Isochoric ,                                            D ) None of these ,

Correct Answer : -  A ) Adiabatic ,

 

8 ) If a force of 10 N is applied parallel to a moment arm 8m , then torque will be ?

A ) 0 Nm ,                                                            B ) 80 Nm ,  

C ) 40 Nm ,                                                         D ) None of these ,

Correct Answer : -  A ) 0 Nm ,

Solution : -

Formula : -

Torque formula : -    Ԏ = rf sinθ  ,

For parallel : -   θ = 0 ,

Ԏ = (8)(10) sin(0)  ,

Ԏ = 0 Nm ,   because ( sin0 = 0 ) .

 

9 ) Shear modulus for  ………… is zero .

A ) liquid ,                                                  B ) solid ,

C ) gas ,                                                     D ) None of these ,

Correct Answer : - A ) liquid ,

 

10 ) X-rays passing through a strong uniform magnetic field , it will ……… ,        

A ) deflect ,                                                         B ) not deflect ,

C ) may or not ,                                         D ) None of these ,

Correct Answer : -  B ) not deflect ,

 

11 )  ev is unit of energy and ev is equals joule .

 

12 ) Sound waves have maximum velocity in …………. ,

A ) solids ,                                                 B ) liquids ,

C ) gases   ,                                     D ) None of these ,

Correct Answer : -  A ) solids ,

 

13 ) The relation between escape velocity and critical velocity is ……. ?

A ) Vesc = √2 V˳ ,                                    B ) V˳ = √2 Vesc  ,

C ) Vesc = √3 V˳ ,                                    D ) V˳ = √3 Vesc  ,

Correct Answer : -   A ) Vesc = √2 V˳   ,

 

14 ) Area under force and displacement gives ……. ?

A ) power ,                                                 B ) work ,

C ) acceleration ,                                                D ) None of these ,

Correct Answer : -  B ) work ,

 

15 ) K.E = (ρ^2) / 2m  ,

 

16 ) Kinetic energy for rotational motion : -

K.E = (1/2)(I)(w)^2 .

 

17 ) Magnifying power of telescope is : -   F˳ / Fe  ,

 

Now go to online quiz section and check your preparation by this link : -

UG Online quizzes