If water were used instead of mercury, the height of the column required would be very large. The density of mercury being much more than that of water, it expands lesser and thus can be used in manageable tubes. There is nothing limiting us from using water instead of mercury except the height of the tube.
63) Mercury is commonly used as a thermometric fluid rather than water because
Answer is:
mercury has greater visibility than water
Explanation:
Related General Physics MCQ with Answers
Answer is:
total internal reflection
Explanation:
Optical fibre works on total internal reflection.
Answer is:
4.20years
Explanation:
Alpha centauri is 4.37 light years from the Sun & after sun alpha centauri is nearest from the earth.
Answer is:
greater than the speed of sound
Explanation:
We know velocity of light is 3*10^8 m/sec. Sound velocity is 330 m/sec. There no possibility to travel in light speed only possible in sound velocity.
Answer is:
spacecraft
Explanation:
In fluid mechanics, Mach number (M or Ma) is a dimensionless quantity representing the ratio of speed of an object moving through a fluid and the local speed of sound. M = v/vsound where, M is the Mach number, v is the velocity of the source relative to the medium, and vsound sound is the speed of sound in the medium. Mach number varies by the composition of the surrounding medium and also by local conditions, especially temperature and pressure. The Mach number can be used to determine if a flow can be treated as an incompressible flow. If M < 0.2-0.3 and the flow is (quasi) steady and isothermal, compressibility effects will be small and a simplified incompressible flow model can be used.