Unit of impedance is ___________.
1). ohm
2). henry
3). tesla
4). hertz
2. The intensity ratio of waves is 25 : 9. What is the ratio of their amplitudes?
3. Electromagnetic waves are transverse in nature is evident by
4. The flux commonly used in brazing is
5. Sextant is an instrument used in which of the following ?
7. ?X- rays are ______. waves.
8. Which type of mirror is used in the head lights of vehicles ?
9. When a barometer reading suddenly recedes it indicates that climate