Question Detail
Which unit we use to express Nuclear sizes ?
- Tesla
- Newton
- Fermi
- None of above
Answer: Option C
1. radian per second is unit of
- Momentum
- Moment of Inertia
- Frequency
- Angle Velocity
Answer: Option D
Explanation:
unit of Momentum is kilogram meter per second,
unit of Moment of Inertia is kilogram square meter,
unit of frequency is Hertz.
2. Harry Brearley has invented
- Electric iron
- Electromagent
- Stainless Steel
- Gramophone
Answer: Option C
Explanation:
Harry Brearley of England has invented Stainless Steel in 1913,
Electric iron has been invented by H.W. Seeley of USA in 1882,
Electromagent has been invented by W.Sturgeon of England in 1824,
Gramophone has been invented by T.A. Edison of USA in 1878.
3. Which of following in not a property of cathode ray.
- Cathode rays are invisible and travel in a straight line.
- These rays can ionise gases.
- These rays can penetrate through thin metal foils.
- These rays make materials cool on which they fall.
Answer: Option D
Explanation:
These rays heat the materials on which they fall.
4. Which law states, "The rate of loss of heat by a body is directly proportional to the difference in temperature between the body and the surroundings."
- Doppler's Effect
- Newton's law of cooling
- Kirchhoff's Law
- Stefan's Law
Answer: Option B
Explanation:
Doppler's Effect - The Doppler effect can be described as the effect produced by a moving source of waves in which there is an apparent upward shift in frequency for observers towards whom the source is approaching and an apparent downward shift in frequency for observers from whom the source is receding.
Kirchhoff's Law - Kirchhoff's Law signifies that good absorbers are good emitters.
Stefan's Law - The radiant energy emitted by a black body per unit area per unit time is directly proportional to the fourth power of its absolute temperature.
5. 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.