Question Detail
Atmospheric pressure is measured by
- Tonometer
- Pyrometer
- Barometer
- Thermometer
Answer: Option C
1. 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.
2. 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 :)
3. K. Macmillan invented
- Bicycle
- Barometer
- Calculating Machine
- Centigrade Scale
Answer: Option A
Explanation:
K. Macmillan of Scotland invented Bicycle in 1839.
Barometer was invented by E. Torricelli of Italy in 1644.
Calculating Machine was invented by Pascal of France in 1642.
Centigrade Scale was invented by A. Celsius of France in 1742.
4. What is unit of Astronomical distance ?
- light year
- angstrom
- weber
- lux
Answer: Option A
Explanation:
angstrom is used to measure wave length,
weber is used to measure Magnetic flux,
lux is used to measure Intensity of illumination.
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.