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- 1. Multiple Choice
For different capillaries of radius r, the condition of liquid rise(h) above the liquid surface is
rh=constant
h/r= constant
h+r= constant
h-r=constant
- 2. Multiple Choice
An aeroplane gets its upward lift due to a phenomenon described by the
buoyancy principle
archimede's principle
Bernoulli's principle
Pascal's law
- 3. Multiple Choice
Two rain drops are found to hit the ground with terminal speeds in the ratio 9:4. Their diameters are in the ratio?
1:1
3:1
2:3
3:2
- 4. Multiple Choice
If the surface tension of water is 7.3× 10^-2 W/m then the excess pressure inside a spherical drop of water of radius 1 mm will be
132 N/m^2
146 N/m^2
158 N/m^2
147 N/m^2
- 5. Multiple Choice
Match the following:
1.Adhesive Force> Cohesive Force
2. Adhesive Force< Cohesive Force
3. Adhesive Force= Cohesive Force
A. cos theta >0
Concave meniscus
B. cos theta =0
plane meniscus
C. cos theta <0
Convex meniscus
1- c, 2- a,3- b
1- a, 2- b,3- c
1- b, 2- a,3- c
1- b, 2- c,3- a
- 6. Multiple Choice
A wire can sustain the weight of 20kg before breaking if the wire is cut into two equal parts each part can sustain a weight of ?
10kg
40kg
20kg
80kg
- 7. Multiple Choice
There are two wires of same material and same length while the diameter of second wire is two times the diameter of first wire, then the ratio of extension produced in the wire by applying same load will be
1:1
2:1
1:2
4:1
- 8. Multiple Choice
The work done per unit volume in deforming a body is given by
stress X strain
1/2(stress X strain)
stress/strain
strain/stress
- 9. Multiple Choice
The breaking force for a wire of diameter D of a material is F. The breaking force for a wire of the same material of radius D is
F
2F
F/4
4F
- 10. Multiple Choice
Which of the following has no dimensions ?
strain
angular velocity
momentum
angular momentum
- 11. Multiple Choice
If the flow has to be streamline then what Should be the Reynolds number?
Less than 1000
Less than or equal to 1000
More than 1000
Between 1000 and 2000
- 12. Multiple Choice
According to the equation of continuity what is the relationship between velocity of fluid and area of crossection
Velocity should be greater than the product of distance and area
Velocity is inversely proportional to area of crossection
Velocity is less than the square root of area and distance covered by fluid
Velocity is directly proportional to area of crossection
- 13. Multiple Choice
Terminal velocity is defined as ?
Variable maximum velocity acquired by a body moving through a viscous medium , when the sum of its weight , buoyant force and viscous force becomes zero
Constant maximum velocity acquired by a body moving through a viscous medium , when the product of its weight , buoyant force and viscous force becomes zero
Variable maximum velocity acquired by a body moving through a viscous medium , when the product of its weight , buoyant force and viscous force becomes zero
Constant maximum velocity acquired by a body moving through a viscous medium , when the sum of its weight , buoyant force and viscous force becomes zero
- 14. Multiple Choice
A block of wood is floating in water in a closed vessel. The vessel is connected to an air pump. When more air is pushed into the vessel, the block of wood floats with:
Larger part in the water
Smaller part in the water
Same part in the water
At some instant it will sink
- 15. Multiple Choice
Which of the energy is not related to streamline flow of liquid?
Potential energy
Kinetic energy
Pressure energy
Surface energy
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