The time rate of loss of heat by a body is proportional to the
difference in temprature between the body and its surroundings
temperature of its surroundings
ratio of the temperature of the body to that of its surroundings
temperature of the body
Correct answer is A
No explanation has been provided for this answer.
Which of the following eye defects can be corrected using a cylindrical lens.
myopia
Astigmatism
Presbyopia
Chromatic abiration
Correct answer is B
No explanation has been provided for this answer.
the property that is propagated in a traveling wave is
frequency
amplitude
energy
wave length
Correct answer is C
No explanation has been provided for this answer.
To produce an enlarged and erect image with a concave mirror,the object must be positioned
at the principal focus
beyond the centre of curvature
between the principal focus and the centre of the curvature
between the principal focus and the pole
Correct answer is D
No explanation has been provided for this answer.
Which of the following is a characteristics of stationary waves?
They are formed by two identical waves travelling in opposite directions
they can be transverse or longitudinal
The distance between two successive nodes is one wavelength
The antinode is a point of minimum displacement
Correct answer is A
They are produced by the superposition of two progressive identical waves travelling in opposite directions