Which of the following types of waves needs a medium for ...
Which of the following types of waves needs a medium for propagation?
sound waves
light waves
radio waves
x - rays
Correct answer is A
Sound is the only mechanical wave among the rest which are electromagnetic waves.
The opposition offered to an alternating current in a C-R series circuit is known as ...
Which of the following statements correctly defines a simple machine? A device ...
Which of the following characteristics of light determines its colour? ...
A parachute attains a terminal velocity when ...
A hydrometer is an instrument used in measuring? ...
Which of the following statements is correct about a machine? ...