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Question Detail
When a body is immersed partly or wholly in a liquid, there is an apparent loss in weight of the body which is equal to the weight of liquid displaced by the body.
- True
- False
Answer: Option A
Explanation:
TRUE, it is Archimedes Principle.
1. What is the relation between wavelength, frequency and velocity ?
- velocity of wave = frequency * wavelength
- velocity of wave = frequency/wavelength
- velocity of wave = wavelength/frequency
- None of above
Answer: Option A
2. Which of the following is an electromagnetic wave ?
- Cathode rays
- Sound wave
- Ultrasonic wave
- Infra red rays
Answer: Option D
3. What are audible sound waves ?
- Having frequency less than 20 Hz
- Having frequency between 20 Hz to 20000 Hz
- Having frequency more than 20000 Hz
- None of above
Answer: Option B
4. Which instrument is used to measure altitudes in aircraft's ?
- Audiometer
- Ammeter
- Altimeter
- Anemometer
Answer: Option C
Explanation:
Ammeter - Measures strength of electric current.
Audiometer - Measures intensity of sound.
Anemometer - Measures force and velocity of wind and directions.
5. Which instrument is used to measure heat radiation ?
- Radar
- Salinometer
- Refractometer
- Radio micrometer
Answer: Option D
Explanation:
Radar - is used to detect the direction and speed of an object by means of radiowaves,
Salinometer - is used to determine salinity of solutions,
Refractometer - is used to measure refractive indices.
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