Question Detail
Which unit we use to express Nuclear sizes ?
- Tesla
- Newton
- Fermi
- None of above
Answer: Option C
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. Atom is the smallest part of matter which takes part in chemical reactions.
- True
- False
Answer: Option A
3. 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.
4. Which instrument is used to measure curvature of spherical objects ?
- Spectroscope
- Spherometer
- Spectrometer
- Sextant
Answer: Option B
Explanation:
Spectroscope - used to record spectra,
Spectrometer - used to measure the position of spectral lines,
Sextant - used to measure the height of very distant objects and also used by navigators to find the latitude. what you thought :)
5. 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.