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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