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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)
m = 30 g
m = 35 g
m = 20 g
None
2. Bernoullis equation is based upon:
isochoric process
isobaric process
isothermal process
adiabatic process
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:
3.3
6.4
7.2
12.8
4. The force of buoyancy on an immersed body is:
due to weight of the body
due to the pressure difference between upper surface and lower surface of the body
due to atmospheric pressure
both A and B are correct
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?
It will rise
It will fall
It will remain unchanged
First it will rise and then fall
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:
the beam will remain horizontal
the pan containing the bulb will go down
the pan containing the bulb will go up
none of the above
7. The pressure at the bottom of a tank of liquid is not proportional to:
the density of the liquid
the area of the liquid surface
the height of the liquid
the acceleration
8. An iron ball is weighed in air and then in water by a spring balance:
its weight in air is more than in water
its weight in water is more than in air
its weight is same both in air and water
its weight is zero in water
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:
5
6
10
2
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:
2 4
6 4
6 2
4 8
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:
6 and 2
3 and 4
2.5 and 3.5
4 8
12. A dam for water reservoir is built thicker at the bottom than at the top because:
pressure of water is very large at the bottom due to its large depth
water is likely to have more density at the bottom due to its large depth
quantity of water at the bottom is large
none of the above
13. Bernoullis equation is applicable to points:
in a steadily flowing liquid
in a stream line
in a straight line perpendicular to a stream line
in any non-viscous liquid
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:
27.6 kPa
50 kPa
60 kPa
70kPa
15. Magnus effect is very near to the:
magnetic field
electric field
Bernoullis theorem
magnetic effect of current
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)
1W
2.75W
1.06W
0.5W
17. A solid is completely immersed in a liquid The force exerted by the liquid on the solid will: none of the above
increase if it is pushed deeper inside the liquid
change if its orientation is changed
decrease if it is taken partially out of the liquid
none of the above
18. In a steady incompressible flow of a liquid:
the speed does not change if the area of cross-section changes
the speed increases if the area of cross-section increases
the speed decreases if the area of cross-section increases
bubbles are produce when the area of the cross-section increases
19. When a slip floats on water:
its displaces no water the mass of water
displaced is equal to the mass of the ship
the mass of water displaced is lesser than the mass of the ship
the mass of water displaced is greater than the mass of the ship
20. If there were a smaller gravitational effect, which of the following forces do you think would alter in some respect?
Viscous force
Archimedes uplift
Electrostatic force
Nuclear force
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:
increases
decreases
remains unchanged
depends on several factors
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:
the beam will remain horizontal
the pan containing the bulb will go down
the pan containing the bulb will go up
the pan will rotate about its axis
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
0.106
10.6
0.901
0.801
24. A solid floats in a liquid in the partially submerged position:
the solid exerts a force equal to its weight on the liquid
the liquid exerts a force of buoyancy on the solid which is equal to the weight of the solid
the weight of the displaced liquid equals the weight of the solid
all of the above
25. A dog is sitting in a boat which is floating in a pond. If the dog drinks some water from the pond then:
the level of water in the pond decreases
the level of water in the pond increases
the level of water in the pond first increases, then decreases
the level of water in the pond remains unchanged
26. The horizontal flow of fluid depends upon:
pressure difference
amount of fluid
density of fluid
all of these
27. A body weighs 5 N in air and 2 N when immersed in a liquid. The buoyant force is:
2 N
3 N
5 N
7 N
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:
more than the density of ice
less than the density of ice
same as the density of ice
none of the above
29. if a liquid is subjected to a horizontal acceleration then:
slope of the liquid is inversely proportional to the horizontal acceleration
slope of the liquid is directly proportional to the horizontal acceleration
there is no direct relation between acceleration and inclination
none of the above
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