Question

70.
To absorb the sound in a hall which of the following are used
(1) Glasses stores
(2) Carpets, curtains
(3) Polished surfaces
(4) Platforms
71. If represents avagadro's number, then the number of molecules in 6 gm of hydrogen at NTP is
(1) 2N
(2) 3N
(3) N
(4) N/6
72. The mean translational kinetic energy of a perfect gas molecule at the temperature TK is
(1) 1 T
(2) Kł
(3) 2 kl
(4) 2KT
73
The amount of heat given to a body which raises its temperature by 1°C
(1) water equivalent
(2) thermal heat capacity
(3) specific heat
(4) temperature gradient
74. During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its
absolute temperature. The ratio Cp/Cv for gas is
Cladding in the optical fiber is mainly used to
(1) to protect the fiber from mechanical stresses
(2) to protect the fiber from corrosion
(3) to protect the fiber from mechanical strength
(4) to protect the fiber from electromagnetic guidance​

Answer 1

Answer:

a-2

b-2

c-4

d-4

e-3

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