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Question Detail
Scalar Quantities are
- physical quantities which have magnitude only and no direction
- physical quantities which have no magnitude only and only direction
- physical quantities which have magnitude only and direction
- physical quantities which have no magnitude and no direction
Answer: Option A
1. 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.
2. What is unit of Viscosity ?
- coulomb
- newton second per square meter
- watt per meter per degree celcius
- joule per kilogram per Kelvin
Answer: Option B
Explanation:
coulomb is unit of Electric Charge,
watt per meter per degree celcius is unit of Thermal Conductivity,
joule per kilogram per Kelvin is unit of Specific Heat capacity.
3. 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
4. The force which opposes the relative motion between different layers of liquid or gases is called
- Critical Velocity
- Streamline Flow
- Terminal Velocity
- Viscous Force
Answer: Option D
Explanation:
Critical Velocity - The maximum velocity upto which fluid motion is streamline is called Critical Velocity.
Streamline Flow - If velocity of all fluid particles is same all the time then it can be said in streamline flow.
Terminal Velocity - When a body falls in viscous medium, its velocity first increases and finally becomes constant. The constant velocity is called terminal velocity.
5. 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.
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