Physics mcq 4 -

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#1. A body weighs 50 g in air and 40 g in a liquid of specific gravity 1.25. The volume of the body is

#2. The S.I. unit of pressure is

#3. A pressure gauge for fluids is called

#4. Fluids s are divided into two classes

#5. The aneroid barometer uses

#6. The earth's atmosphere exerts a high pressure on our body. Still the body is not crushed. This is because the pressure of air

#7. When a small hollow spherical ball of rubber is lowered into a vessel of water

#8. A sudden fall in the level of mercury in a barometer indicates

#9. . Which of the following statements is true? The pressure at a point at a given depth in a fluid

#10. The instrument used to measure atmospheric pressure is

#11. A hydraulic brake in an automobile uses

#12. Two vessels A and B, having the same base area but different shapes, are filled with the same liquid to the same height. The thrust at the bottom of A will

#13. In a hydraulic press

#14. . In a hydraulic press, P and W are forces acting on the small piston and large piston, respectively. Their diameters were "d." Then P/W is

#15. In a hydraulic press, the diameters of the pistons are in the ratio of 1:10. A force of 20 N is applied to the smaller piston. The maximum weight that will be lifted on the larger piston is

#16. Mercury is used in a barometer because

#17. . The height of a water barometer at a place where atmospheric pressure is 30 inches of mercury (specific gravity 13.6) is

#18. A rubber ball with several pin holes is filled with water. On squeezing it, water is forced out with equal force through all the holes. This proves

#19. . If a barometer is enclosed in a bell jar and the air in the bell jar slowly removed the height of mercury column

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