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Questions |
Answers |
| 1 |
An example of a longitudinal wave is – |
Sound wave |
| 2 |
Sound wave in air is – |
longitudinal |
| 3 |
In a Sitar, which type of sound vibrations are produced? |
Stationary and Transverse |
| 4 |
Long radio waves are reflected by which layer of the earth’s surface – |
Ionosphere |
| 5 |
Wireless communication is reflected back to the earth’s surface by the – |
Ionosphere |
| 6 |
Waves of the Ultra High Frequency (UHF) range normally propagate by means of – |
Space waves |
| 7 |
Which waves cannot be transmitted through a vacuum? |
Sound wave |
| 8 |
Cosmic rays – |
Are charged particles |
| 9 |
What is the distance between two successive crests or successive troughs called? |
Wavelength |
| 10 |
The velocity of electromagnetic waves is – |
3 × 108ms–1 |
| 11 |
Which electromagnetic radiation has the maximum energy? |
X-rays |
| 12 |
Microwaves are electromagnetic waves having frequencies in the range of – |
1 GHz – 300 GHz |
| 13 |
A radar which detects the presence of an enemy aircraft uses – |
Radio waves |
| 14 |
When there is a depletion of ozone in the stratosphere, the wavelength of radiation striking the earth’s surface will be – |
10–7 m |
| 15 |
The waves used in common TV remote control are – |
Infrared Rays |
| 16 |
What does a TV remote control unit use to operate a TV set? |
Radio waves |
| 17 |
Waves used for telecommunication are – |
Microwave |
| 18 |
FM broadcasting service uses the range of frequency bands between – |
88-108 MHz |
| 19 |
A radio station broadcast at 30-metre band. The frequency of the carrier wave transmitted by this station is – |
10 MHz |
| 20 |
CT Scan is done by using – |
X-Rays |
