If mercury in a barometer is replaced by water, the height of 3.75 cm of mercury will be following cm of water________________?

Related Mcqs:

1. Mercury is often used in barometer because____________________?

   A. it is the best liquid
   B. the height of barometer will be less
   C. its vapour pressure is so low that it may be neglected
   D. both B. and C.
   E. it moves easily

2. A piece of metal of specific gravity 7 floats in mercury of specific gravity 13.6. What fraction of its volume is under mercury ?

   A. 0.5
   B. 0.4
   C. 0.515
   D. 0.5
   E. none of the above

3. Barometer is used to measure__________________?

   A. pressure in pipes, channels etc.
   B. atmospheric pressure
   C. very low pressure
   D. difference of pressure between two points
   E. rain level

4. Viscosity of water in comparison to mercury is_________________?

   A. higher
   B. lower
   C. same
   D. higher/lower depending on temperature
   E. unpredictable

5. Mercury does not wet glass. This is due to property of liquid known as__________________?

   A. adhesion
   B. cohesion
   C. surface tension
   D. viscosity
   E. compressibility

6. A bucket of water is hanging from a spring balance. An iron piece is suspended into water without touching sides of bucket from another support. The spring balance reading will_________________?

   A. increase
   B. decrease
   C. remain same
   D. increase/decrease depending on depth of immersion
   E. unpredictable

7. A square surface 3 m x 3 m lies in a vertical line in water pipe its upper edge at water surface. The hydrostatic force on square surface is____________________?

   A. 9,000 kg
   B. 13,500 kg
   C. 18,000 kg
   D. 27,000 kg
   E. 30,000 kg

8. An open vessel of water is accelerated up an inclined plane. The free water surface will__________________?

   A. be horizontal
   B. make an angle in direction of inclination of inclined plane
   C. make an angle in opposite direction to inclination of inclined plane
   D. any one of above is possible
   E. none of the above

9. The velocity of jet of water travelling out of opening in a tank filled with water is proportional to_________________?

   A. head of water (h)
   B. h2
   C. V/T
   D. h2
   E. h3/1

10. Specific weight of sea water is more that of pure water because it contains_________________?

    A. dissolved air
    B. dissolved salt
    C. suspended matter
    D. all of the above
    E. heavy water