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 ,
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