Mechanical Physics

Density of water is

The body is called perfectly plastic body

Pressure is a scalar quantity because

Why do water droplets always take a round shape when dropped onto plane surfaces?

In which situation the molecular attraction is very strong?

The force of buoyancy depends on the density and . . . . . . . . of the liquid displaces.

Which one of the following statement is not correct?

If two miscible liquids of same volume but different densities ρ 1 and ρ 2 are mixed, then the density of the mixture is given by

Assertion (A): An iron ball floats on mercury but gets immersed in water. Reason (R): The specific gravity of iron is more than that of mercury.

Two capillary tubes of different diameters are dipped in water. The rise of water is

What is the relative density equal to-

Ice floats on water because its density-

The density of water will reach its maximum value at the temperature of

While floating in a sea what part of an iceberg is above the surface of the sea?

Two identical solid pieces, one of gold and other of silver, when immersed completely in water exhibit equal weights. When weighed in air (given that, density of gold is greater than that of silver),

Consider the following statements. 1. At any point inside the liquid the pressure exerted by the liquid is directly proportional to its depth from the free surface. 2. At every point and in every direction, the pressure exerted inside the liquid at rest is same. Which of the statement(s) given above is/are correct?

If the liquid level falls in a capillary then radius of capillary will

Object floats on water based on-

Consider the following statements. 1. SI unit of atmospheric pressure is Nm -2 or pascal and CGS unit is dyne/cm 2 . 2. The barometer is a device by which the atmospheric pressure is measured. 3. The standard atmospheric pressure is the pressure required of 76 cm of Hg column or 760 mm of Hg column, which is equivalent to 1 atm. Which of the statements given above is/are correct?

What is the density of water-

Which of the following statements is not true regarding the effect of increasing temperature on the distribution of molecular motion in a gas-

Consider the following statements. The rise of a liquid in a capillary tube depends on 1. The surface tension of liquid 2. The length 3. The outer radius 4. The inner radius of the tube Which of the following statements is/are true?

While travelling by plane, the ink of the pen starts to come out

Assertion (A) Pascal law is the working principle of a hydraulic lift. Reason (R) Pressure is equal to thrust per unit area.

When pressure is applied to a fluid, the pressure change is transmitted to every part of the fluid without any loss. Which of the following laws explains this phenomenon?

The SI unit of elastic potential energy is

The breaking stress of wire depends on

Any body kept in a fluid experiences an upward force called . . . . . . . .

Assertion (A) The concept of surface tension is held only for liquid. Reason (R) Surface tension does not hold for gases.

The pressure of a fluid varies with depth h as p = p 0 + pgh, where p is the fluid density. This expression is associated with

An ice cube is floating in a glass of water. What happens to the water level when the ice melts?

When a coil spring is compressed, the work is done on the spring. What is the elastic potential energy?

Bulk modulus of elasticity is defined as

Which of the following is not based on the Archimedes Principle?

In CGS system, the unit of strain is:

As the depth decreases from the free surface of a fluid, the pressure exerted by the liquid will be-

Pressure at any point of a liquid increases with

Soaps clean surfaces on the principle of based on

The modulus of rigidity of a liquid is

Due to which property the falling drop of water is spherical-

Pressure is measured by-

It is easier to swim in a sea water than in ordinary water because

The separation of cream from milk by churning is due to

A liquid disturbed by string comes to rest due to

At which temperature density of water is maximum?

Which law/principle states that when a body is immersed fully or partially in a fluid, it experiences an upward force that is equal to the weight of the fluid displaced by it?

Which of the following statement(s) about a fluid at rest in a cup is/are correct? 1. Pressure is same at all the points in the fluid. 2. Pressure is exerted on the walls. 3. Pressure exists everywhere in the fluid.

Increasing the amount of a substance does not change its

Kerosene rises in the wick of the stove is due to

According to gas kinetic theory, the absolute zero temperature is achieved only when-

Why it is easier to swim in the sea than in a river?

The working of venturimeter is based on

The pressure in a liquid at a given depth below the surface

With the rise of temperature, the viscosity of liquid

If the area is small for a given force, the pressure will be-

Oil spreads on water surface because

Cohesive force is experienced between

As the depth increases from the free surface of a fluid, the pressure exerted by the liquid will be-

Which of the following elements was first produced artificially?

What is the thrust per unit area called?

A boat full of iron nails is floating on water in a lake. When the iron nails are removed, the water level

Which one of the following substances possesses the highest elasticity?

What is the force exerted by water in upwards direction?

Kerosene oil floats on water because

If the depth of water in a dam is 'h' and 'A' is the transverse area of dam and 't' is the thickness of the dam. How, the pressure of dam wall depend on?

Assertion (A) The solids are more elastic and gases are least elastic. Reason (R) It is so because for the given stress applied the gases are more compressible than that of solids.

Which of the following physicists explained the existence of Buoyant force?

The density of silver is 10.8 × 10 3 kgm -3 and the density of water is 10 3 kgm -3 . What is the relative density of silver?

With the rise of temperature, the surface tension of a liquid

Virtually the force exerted on a vessel wall by a gas molecules.

What is an ideal fluid?

Which one of the following is not a result of surface tension?

Pressure inside a soap bubble is

Match the columns. Column I Column II a. Viscosity 1. Oil rises in the narrow long tube b. Capillarity 2. tendancy to contract c. Surface tension 3. Attractive between molecules of same substances d. Cohesive force 4. Fluid friction

A body is floating in a liquid partly immersed. The body and the liquid are taken to moon. The body

The force of attraction applied between molecules of the same substance is called:

Viscosity is the property of liquids by virtue of which they

Assertion (A): When a ship enters a sea from a river, it rises a little. Reason (R): The density of sea water is greater than that of river water. In the context of the above statements, which of the following is true?

In automobile hydraulic brakes work on

Static science is associated with

Insects can move on the surface of water without sinking due to

In cold weather, aquatic animals survive even when water at the top layer of the lake freezes into ice because

The size of the Respirable Suspended Particulate Matter (R.S.P.M.) in air is

A body is just floating in a liquid if the body is slightly pressed down and released. It will

Two pieces of different metals, when completly immersed in water, experience equal upthrust, then

The relative density of silver is 10.8. The density of water is 10 3 kgm -3 . What will be the density of silver in SI unit.

Which of the following increases when the pressure exerted by a solid decreases-

When the temperature increases, the angle of contact of liquid

When a cork and a iron nail are placed in a beaker filled with water, the cork floats while the iron nail is submerged. What is the reason behind it?

The rain drops are spherical because

According to . . . . . . . ., pressure is equal to the force divided by the area on which it acts.

If you fill water in glass and ice cube. What happens when ice cube completely melts?

Surface tension depends on

The force acting on an object perpendicular to the surface is called . . . . . . . .

A body floats at 4°C water. If temperature reaches 100°C, then

A liquid does not wet the sides of a solid, if the angle of contact is

Consider the following statement. If there were no phenomenon of capillarity. 1. It would be difficult to use a kerosene lamp then. 2. One would not be able to use a straw to consume a soft drink. 3. The blotting paper would fail to function. 4. The big trees that we see around would not have grown on the Earth. Which of the following statements given above are correct?

A tank, filled partially with a liquid, is subjected to a uniform horizontal acceleration. Which of the following is true for the surface of liquid in the tank?

It is easy to burst a gas-filled balloon with a needle than with a nail. It is because

If by applying a force, the shape of a body is changed, then the corresponding stress is

Which of the following factors depends on the result of buoyancy force acting on the object in a given fluid?

The density of a substance is defined as-

Pressure is defined as-

Which one of the following device is used tomeasure atmospheric pressure?

Which of the following state of substance has the maximum kinetic energy?

Purity of a metal can be determined with the help of

What is the pressure inside the aircraft cabin at altitude?

The surface tension of water on adding detergent to it

The Young's modulus for perfectly rigid body is

The speed increases of ships is based on-

A drop of a fluid is combined because the attraction of its particles minimizes its possible area. This phenomenon is called-

The spring constant of a spring depends on its

The friction in liquids is called:

What will be the buoyancy force exerted by the water?

Which of the following is dimension of pressure-

Which of the following substance density is greater than the density of water?

Calculate the pressure (in Pa) if a thrust of 1000 N is applied to an area of 5 m 2 .

200 gm of water is filled in a weightless balloon. Its weight in water will be

A deep sea diver may hurt his ear drum during diving because of

If the amount of water vapour in the air is high, what will be the rate of evaporation-

Four wires of same material and dimensions as mentioned below are stretched by a load of same magnitude separately. Which one of them will be elongated maximum?

Fish can survive in a frozen lake because

An application of Bernoulli's equation for fluid flow is found in

Which of the following is not based on the principle of Archimedes?

What is another name for the buoyancy force exerted by water to a submerged body?

If an unsaturated sugar solution is prepared by mixing 100 grams of sugar with half litre of water, which of the following physical quantities will not change?

The most important property of nanomaterial is

According to Archimedes principle, the upward force experienced by a body immersed in a fluid is equal to which of the following?

Center of buoyancy always-

Consider the following statements. 1. Surface tension of liquid depends on length but not on the area, like the elastic property. 2. SI unit of surface tension is N/m. 3. Surface tension is a scalar quantity because it has no specific direction for a given liquid. Which of the statement(s) given above is/are correct?

The clouds float in the atmosphere because of their low

If ice floating on water in a vessel melts, the water level in the vessel . . . . . . . .

The pressure of the earth's atmosphere at sea level is due to the

When a ship enters a sea from a river, what happens?

Upthrust force and weight of object would be-

What would be the force generated by a wall on which water strike normally at a speed of 10 m/s and at a discharge of 0.0001 m 3 /sec?

What is the magnitude of buoyancy force depends on?

The ability of a material to deform without breaking is called:

If we increase the area of a given force, what will be the pressure-

Which of the following is not a characteristics of a solid?

In a capillary tube a fluid rises more as compared to water, it is due to

Consider the following statements. The fraction of a ball floating inside the liquid depends upon 1. Density of the liquid 2. Mass of the ball 3. Density of the ball Which of the statements given above are correct?

Specific gravity is defined as the ratio of

The excess of pressure inside a dropper bubble is

The Hooke's law is valid for

Why does an iron nail float on mercury while it sinks in water?

It which temperature is the density of water maximum?

It is difficult to cut things with a blunt knife because

Consider the following statements. 1. The liquid pressure is inversely proportional to the density of liquid. 2. The pressure exerted on the liquid doesn't depend upon the shape or size of the container. Which of the statement(s) given above is/are correct?

Water rises in plant fibres due to

The working of an atomiser depend upon

The density of water is 1 g./cc. This is strictly valid at

The building and movement of ships is based on . . . . . . . .

The property of matter by virtue of which a body tends to regain its original shape and size after the removal of deforming force is called

The unit of strain is

Assertion (A) Machine parts or jammed in winter. Reason (R) The viscosity of lubricant used in machine parts increase at low temperature.

When a body is completely or partially immersed in a fluid, this body experiences a force equal to the weight of the displaced fluid, this principle is known as

Along a streamline flow of fluid,

1 pascal equal 1 . . . . . . . .

The temperature during solid melting-

Two cars, passing each other at high speed, are in danger of side swiping because

Bernoulli's theorem deals with the principle of conservation of-

The elastic potential energy of a body is 1. Work done by the external force against the deforming force. 2. Work done against the external force by the deforming force. 3. The sum of work done by the external force and the deforming force. Which one option is true?

Which of the following options is true with respect to diffusion of gases with respect to solid and liquid?

The spring balance works on the principle of . . . . . . . .

Longitudinal strain is defined when

In an experiment to determine the Young's modulus of a material of a wire, and the suspended mass are doubled. Then the Young's modulus of the wire

On the basis of buoyancy theory, the ship floats in water, which scientist is first credited with identifying this principle?

The tendency of a liquid drop to contract and occupy minimum area is due to

Whether an object will float or sink in a liquid, depends on

Which of the following is the by product derived from the refining process of petroleum?

The terminal velocity of a small sized spherical body of radius r falling in a viscous liquid is proportional to

If there were no gravity, which of the following will not be there for a fluid?

Mobiles and Automobiles have brought about a revolution in the social life of Indians, especially in the rural, in terms of 1. Mobility of the people 2. Connectivity of the people 3. Sensitivity of the people Select the correct answer:

Consider the following statements. 1. Greater the value of Young's modulus of a material, larger is its elasticity. 2. Steel is more elastic than copper. Which of the statement(s) given above is/are correct?

The pressure at the bottom of a liquid tank does not depend on

Which of the following reasons, clouds to float in the sky?

For perfectly elastic bodies, the value of coefficient of restitution is

The maximum density of water is at

Steel is more elastic than rubber because it

Assertion (A) An iron ball floats on mercury but gets immersed in water. Reason (R) The specific gravity of iron is more than that of mercury.

Writing an black board with a piece of chalk is possible by the property of

Hydraulic brakes used in automatic vehicles is direct virtual application of which law?

Spherical form of raindrop is due to

The pressure of air at a certain temperature is proportional to-

While lifting a bucket of water from a well, we feel that the bucket

If two bubbles of soap of different diameter come in contact with a tube, then what will happen?

What is the upward pressure generated by an object being placed on a fluid?

Soap bubble attains spherical shape due to . . . . . . . .

A needle sinks in water whereas a ship made of iron floats on it because

How does a blotting paper absorbing ink?

Consider the figure of a fountain with four holes, given below. Which one of the holes in the fountain will throw the water farthest?

Match the columns. Column I Column II a. Linear strain 1. Change in the shape without changing its volume b. Volumetric strain 2. Change in length alone c. Shearing strain 3. Change in volume d. Young's modulus 4. Ratio of normal stress to longitudinal strain

A man standing close to the platform at a railway station experiences a pulling force towards a fast moving train because of . . . . . . . .

An iron needle floats on the surface of water due to

When an object sinks, the up thrust of the fluid on the object is:

Kerosene oil rises up in the wick of lantern because of

A liquid is kept in a glass beaker. Which one of the following statements is correct regarding the pressure exerted by the liquid column at the base of the beaker?

Which of the following statements is incorrect?

What is the force acting perpendicular to plane?

Consider the following statements. 1. The SI unit of young's modulus of elasticity is N/M 2 . 2. The reciprocal of the bulk modulus of the material of the body is called the compressibility of that material. 3. Compressibility of gases is very small. Which of the statements given above are correct?

The surface of a lake is frozen in severe winter, but the water at its bottom is still liquid. Why? Following are some options

A sudden fall in barometer reading indicates that the weather will be

For which one of the following capillarity is not the only reason?

When an air bubble at the bottom of lake rises to the top, it will

Consider the following statements. 1. The viscosity of a gas increases with rise in temperature. 2. The viscosity of the liquid falls very rapidly with rise in temperature. Which of the statement(s) given above is/are correct?