I and IV only
II and IV only
I and III only
III and IV only
Correct answer is D
Due to rectilinear propagation of light we have ecslipse which occur as a result relative motion of the earth, sun and moon
wavelength
harmonics
frequency
velocity
Correct answer is C
Timber/ quality depends on the overtones or harmonics, and timber is a characteristic property of source of sound,
A harmonic is a wave with a frequency that is a positive integer multiple of the fundamental frequency,
These rest on the fundamental property of FREQUENCY.
Given the progressive wave equation y = 5 sin (2000 πt - 0.4x), calculate wave length
12.4 m
15.7 m
17.5 m
18.6 m
Correct answer is B
Comparing y = 5sin (200 πt - 0.4X) with the wave equation y = A sin (wt -KX) K = (2π)/λ = 0.4
∴ λ = (2π)/0.4 = 15.7M
In a good thermos flask, heat loss is reduced through the following features EXCEPT?
the lens surface
the insulating cork
silvered walls
the cork lid
Correct answer is A
The silver coating on the inner bottle of a thermos flask is used to prevent heat transfer by radiation
25%
33%
75%
82%
Correct answer is C
Relative
Humidity = (S.V.P. of water at dew point)/S.V.P of water at air temperature =(18)/24 x 100% = 75%