An ice block floats in a liquid whose density is less than water. Apart of block is outside the liquid. When whole of ice has melted, the liquid level will
A)
Rise
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B)
Go down
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C)
Remain same
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D)
First rise then go down
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The rain drops falling from the sky neither injure us nor make holes on the ground because they move with
A)
Constant acceleration
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B)
Variable acceleration
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C)
Variable speed
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D)
Constant terminal velocity
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A liquid flows through a non-uniform pipe. The pressure in the pipe will be
A)
Lower where the cross-section is smaller
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B)
The same throughout the pipe
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C)
Higher where the cross-section is smaller
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D)
Higher where velocity of the liquid is smaller
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The clouds float in the atmosphere because of their low
A)
Pressure
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B)
velocity
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C)
Temperature
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D)
density
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A small wooden block is floating in a tub of water. The water is gradually heated. The volume of the wooden block visible above the water level
A)
Fluctuates
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B)
Decrease
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C)
Increases
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D)
Remains the same
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Hydraulic brakes are based on
A)
Dulong and Petit's law
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B)
Pascal's law
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C)
Pressure law
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D)
Dalton's law of partial pressure
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Two cubes of equal mass, one made of iron and the other of aluminium are immersed in water and weighed. Under such case
A)
The weight of aluminium cube will be less than that of the iron cube
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B)
The two weights will be equal
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C)
The weight of the iron cube will be less than that of the aluminium cube
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D)
The data provided is insufficient
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An iceberg is floating in the sea. Out of 10 parts of its mass, how many will remain above the surface of the water?
A)
Three parts
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B)
Two parts
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C)
One part
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D)
five parts
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The relative densities of three liquids X, Y and Z are 0.7, 1.2 and 1.7 respectively. A small rod floats vertically just fully immersed in the liquid Y. Which of the following set of diagrams illustrates the equilibrium positions of the rod in the liquids X and Z?
A)
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B)
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C)
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D)
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Construction of a submarine is based on
A)
Bernoulli's theorem
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B)
Pascal's law
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C)
Archimedes's principle
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D)
None of these
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Rain drops are falling with a constant speed by the time they reach the ground because
A)
Rain drops originate in outer space where the gravitational forces are negligible
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B)
The force due to air resistance increases with the speed of the rain drops until it balances the gravitational force
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C)
Rain drops are too light and hence not affected by acceleration due to gravity
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D)
The force due to air resistance is constant and balances the gravitational force
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The spherical shape of rain-drop is due to
A)
Density of the liquid
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B)
Surface tension
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C)
Atmospheric pressure
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D)
Gravity
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Air is blown through a hole on a closed pipe containing liquid. Then the pressure will
A)
Increase on sides
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B)
Increase downwards
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C)
Increase in all directions
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D)
Never increases
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A large ship can float but a steel needle sinks because of
A)
Viscosity
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B)
Surface tension
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C)
Density
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D)
None of these
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In the following figure is shown the flow of liquid through a horizontal pipe. Three tubes A, B and C are connected to the pipe. The radii of the tubes A, B and C at the junction are respectively 2 cm, 1 cm and 2 cm. It can be said that the
A)
Height of the liquid in the tube A is maximum
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B)
Height of one liquid in the tubes A and B is the same
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C)
Height of the liquid in the three tubes is the same
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D)
Height of the liquid in the tubes A and C is the same
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The working of an atomizer depends upon
A)
Bernoulli's theorem
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B)
Boyle's law
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C)
Archimedes principle
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D)
Newton's law of motion
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Velocity of water in a river is
A)
Same everywhere
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B)
More in the middle and less near its banks
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C)
Less in the middle and more near its banks
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D)
Increase from one bank to other bank
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To keep constant time, watches are fitted with balance wheel made of
A)
Invar
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B)
Stainless steel
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C)
Tungsten
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D)
Platinum
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Writing on blackboard with a piece of chalk is possible by the property of
A)
Adhesive force
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B)
Cohesive force
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C)
Surface tension
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D)
Viscosity
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The most characteristic property of a liquid is
A)
Elasticity
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B)
Fluidity
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C)
Formlessness
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D)
Volume conservation
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