- Infra-red waves produce heating in a microwave oven
- The frequency of the microwaves must match the resonant frequency of the water molecules
- The frequency of the microwaves has no relation with natural frequency of water molecules
- Microwaves are heat waves, so always produce heating
Category: Past Papers MCQs
| No. | Topics. | No. | Topics. |
|---|---|---|---|
| 1. | Biology mcqs | 2. | Chemistry mcqs |
| 3. | General Knowledge mcqs | 4. | Pak Studies |
| 5. | Physics mcqs |
- hydrogen atoms only
- atoms or ions which are uni electron
- atoms or ions which have only two electrons
- hydrogen molecule.
- telephone lines
- optical fibres
- aluminium cables
- twisted pair
- the relative frequency shift is smaller for light than for soun
- the velocity addition valid for sound is not true for light waves.
- velocity of light is very large as compared to soun
- light waves are electromagnetic waves but sound waves are mechanical.
- Damped
- Undamped
- Modulated
- None of the above
- T-1
- LT-1
- L-1T-1
- L-1T
- 1 : 4
- 1 : 2
- 1 : 1
- 1:05
- 23 m/s towards East
- 17 m/s towards East
- 23 m/s towards West
- 17 m/s towards West
- 5000 CGS unit
- 2500 CGS unit
- 7500 CGS unit
- 1000 CGS unit
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