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1. A neckless weighing 50 g in air but it weighs 46 g in water. Assume copper is mixed with gold to prepare the neckless. How much copper is present in it? (Specific gravity of gold is 20 and that of copper is 10)




2. Bernoullis equation is based upon:




3. A vessel contains oil (density 0.8 g/cc) over mercury (density 13.6 g/cc). A homogeneous sphere floats with half its volume immersed in mercury and the other half in oil. The density of the material of the sphere in g/cc is:




4. The force of buoyancy on an immersed body is:




5. A boat is floating on the surface of water in a tank carrying steel balls. If the balls are thrown into the tank one by one how will it affect the level of water?




6. A glass bulb is balanced by a brass weight in a sensitive beam balance. Now the balance is covered by a glass-jar which is then evacuated. Then:




7. The pressure at the bottom of a tank of liquid is not proportional to:




8. An iron ball is weighed in air and then in water by a spring balance:




9. A block weighs 15 N and 12 N in air and water respectively. When it is immersed in another liquid it weighs 13 N then the relative density of the block is:




10. An alloy is prepared by mixing equal volume of two metals. The specific gravity of alloy is 4. But when equal masses of two same metals are mixed together the specific gravity of alloy is 3. The specific gravity of each metal is:




11. When equal volumes of two substances are mixed, the specific gravity of mixture is 4. When equal weights of the same substances are mixed, the specific gravity of the mixture is 3. The specific gravity of the two substances would be:




12. A dam for water reservoir is built thicker at the bottom than at the top because:




13. Bernoullis equation is applicable to points:




14. A closed rectangular tank 10 m long, 5 m wide and 3 m deep is completely filled with an oil of specific gravity 0.92. The pressure difference between the rear and front corners of the tank, if it is moving with an acceleration of 3 m/s2 in the horizontal direction, is:




15. Magnus effect is very near to the:




16. In each heart beat, a heart pump 80 ml of blood at an average pressure of 100 mm of Hg. What will be the power output of the heart? (Assume 60 heart beats per minute)




17. A solid is completely immersed in a liquid The force exerted by the liquid on the solid will: none of the above




18. In a steady incompressible flow of a liquid:




19. When a slip floats on water:




20. If there were a smaller gravitational effect, which of the following forces do you think would alter in some respect?




21. What is flowing through a pipe of uniform cross-section under constant pressure. At some place the pipe becomes narrow; the pressure of water at this place:




22. A glass bulb is balanced by a brass weight in a sensitive beam balance Now the balance is covered by a bell-jar which is then evacuated; then:




23. In English, the phrase tip of the iceberg is used to mean a small visible fraction of something that is mostly hidden. For a real iceberg, what is this fraction if the density of sea water is 1.03 g/cc and that of ice is 0.92 g/cc? 0.901




24. A solid floats in a liquid in the partially submerged position:




25. A dog is sitting in a boat which is floating in a pond. If the dog drinks some water from the pond then:




26. The horizontal flow of fluid depends upon:




27. A body weighs 5 N in air and 2 N when immersed in a liquid. The buoyant force is:




28. In a beaker containing liquid, an ice cube is floating When ice melts completely, the level of liquid rises Then the density of the liquid is:




29. if a liquid is subjected to a horizontal acceleration then: