1. A piece of cork is embedded inside an ice block which floats in water. What will happen to the level of water when all ice melts?
It will go down
It will come up
It will remain at the same level
First it will go down and it will come up
It will remain at the same level
2. When a body is immersed in a fluid the force of buoyancy of the fluid on the body depends on
the immersed volume of the body
density of the liquid
acceleration due to the gravity at the place
All the above
All the above
3. A pressure gauge for fluids is called
a hydrometer
a manometer
a lactometer
an anemometer
a manometer
4. The aneroid barometer uses
mercury
distilled water
alcohol
does not use any liquid
does not use any liquid
5. A device used to measure heights above sea level is known as
altimeter
anemometer
dilatometer
potentiometer
altimeter
6. The instrument used to measure atmospheric pressure is
Pyrometer
Eudiometer
Barometer
Hydrometer
Barometer
7. A hydraulic brake in an automobile uses
a fluid to transmit the braking force
the force applied by the driver
hydrogen gas and not any liquid
a vacuum brake
a fluid to transmit the braking force
8. In a hydraulic pressure
force on each square centimetre of the small piston is less than the force on each square centimetre of the large piston
the distance the small piston moves is equal to the distance the large piston moves
applied pressure is equally transmitted throughout the liquid in all directions
force acting on small piston is equal to the force acting on large piston
applied pressure is equally transmitted throughout the liquid in all directions
9. Mercury is used in a barometer because
its density being very high 13.6 g/cm3 the height of mercury column is conveniently small
at the ordinary temperature its vapour pressure is small
it is opaque and does not wet glass
All the above
All the above
10. The hydraulic jack to lift heavy vehicles in automobile service stations is one of the applications of
Pascal's law
Principle of Archimedes
Boyle's law
Hooke's law
Pascal's law
11. A simple mercury barometer is found in a slightly slanting position. The atmospheric pressure
is found by measuring the slanting height of the mercury column
is given by the vertical height
cannot be measured with it
can be measured by both the methods described above
is given by the vertical height
12. The instrument used to determine the RD (Relative Density) of a liquid by the principle of floatation is
Hygrometer
Hypsometer
Hydrometer
Densimeter
Hydrometer
13. A lactometer is used to
find out the specific gravity of liquids
measure the volumes of liquids
test the purity of milk
determine the strength of acid in car batteries
test the purity of milk
14. Solids have definite shapes. This is because
the forces of cohesion of the molecules within are very much less in them
the forces of cohesion are very large
the forces of adhesion are large
the forces of adhesion are less
the forces of cohesion are very large
15. The attraction of unlike molecules at the common surface is known as
adhesion
cohesion
surface tension
capillarity
adhesion
16. Mercury does not stick to glass because
cohesive forces between the mercury molecules are greater than adhesive forces between mercury and glass molecules
the adhesive forces between mercury and glass molecules are greater than the cohesive forces
both the cohesive and adhesive forces are equal
None of the above
cohesive forces between the mercury molecules are greater than adhesive forces between mercury and glass molecules
17. In a river, the currents are fastest where the river is
wide and shallow
narrow and shallow
wide and deep
narrow and deep
narrow and shallow
18. Pieces of camphor placed on water move about rapidly. This is because of
diffusion
viscosity
surface tension
capillarity
surface tension
19. In compact porous soil, the rising of the water is due to
capillarity
cohesion
adhesion
viscosity
capillarity
20. The mixing up of two gases as a result of random motion of molecules is called
diffusion
effusion
vaporisation
sublimation
diffusion
21. When a bottle of perfume is opened in one corner of a room the smell spreads soon throughout the room. This is an example of
surface tension
capillarity
viscosity
diffusion
diffusion
22. When a bowler spins a ball, it changes its direction in the air. This is due to
turbulence caused by the wind
buoyancy of air
unequal pressures acting on it
sudden change in the direction of the wind
unequal pressures acting on it
23. A capillary tube is partially dipped vertically in a vessel containing water. Due to capillarity water rises in the tube. The height of water rise in the tube can be increased by
decreasing the radius of the capillary tube
increasing the radius of the capillary tube
increasing the height of water in the vessel
None of these
decreasing the radius of the capillary tube
24. The property of a fluid by which it resists relative motion within itself is known as
cohesive force
surface tension
diffusion
viscosity
viscosity
25. Powder clings to the skin because of
cohesion
adhesion
capillary action
absorption
adhesion
26. The fact that two large ships travelling on close parallel courses in the same direction tend to move towards each other can be explained by
Bernoulli's principle
Magnetic properties of the ship's material
Newton's third law of motion
Earth's gravitational force
Bernoulli's principle
27. A man weighing 50 kg floats on water in a lake. His apparent weight is
50 kg
45 kg
zero
150 kg
zero
28. A man stands on the pan of a balance holding a fish in his right hand and bucket of water in his left hand. If he transfers the fish into the bucket, the total weight on the pan
increases
decreases
remains the same
first increases and then decreases
remains the same
29. The attraction between similar molecules is called
