The phenomenon of light bending round an obstacle is?
diffraction
refraction
reflection
polarization
Correct answer is A
No explanation has been provided for this answer.
Increase the reverberation of sound in the hall
increase the amount of echo in the hall
reduce the hight of the ceiling from the floor
reduce the reverberation of sound in the hall
Correct answer is D
In a large auditorium perforated, absorbent materials are used to line the ceiling so as to reduce the effect of multiple reflection of echo called reverberation
I,II and III only
I, III and IV only
II, III and IV only
I, II, III and IV
Correct answer is B
No explanation has been provided for this answer.
The blade of a hoe feel colder to touch in the morning than the wooden handle because the
handle is a better conductor of heat than blade
handle contains stored energy in form of heat
blade is a better conductor of heat than the handle
blade is placed at a lower temperature than the heat
Correct answer is C
No explanation has been provided for this answer.
I. Mass
II. Density
III. Temperature
IV. Nature of substance
which of the above affect diffusion?
I and II only
I,II and IV only
II, III and IV only
I, II, III and IV
Correct answer is C
Rates of diffusion of a substance generally depend on density temp. and nature of substance II,III and IV