PROPERTIES OF MATTER

Q On extremely cold winter nights, water pipes burst because –

Q A corked bottle filled with water will break upon freezing because:

Q What will be the change in the volume of water if its temperature is reduced from 9°C to 3°C?

Q For a steel boat floating in a lake, the weight of the water displaced by the boat is—

Q When a ship moving in a river enters the sea, its level—

Q Why does an iron nail float in mercury but sink in water?

Q When a solid object is immersed in water, there is a loss in its weight. How much is this loss?

Q Ice floats in water but sinks in alcohol because –

Q A steel ball floats in mercury because –

Q When an iron ball is dropped into a bucket full of mercury, then –

Q At what temperature is the density of water maximum?

Q Which of the following remains unchanged when the amount of a substance changes?

Q Why does a swimmer find it easier to swim in sea water compared to river water?

Q Why do clouds float in the atmosphere?

Q  The walls at the bottom of a dam are made thicker because –

Q  The walls at the bottom of a dam are made thicker because –

Q Skating on ice demonstrates that when pressure is increased, the melting point of ice —

Q Why does a heavy iceberg melt more from the bottom than from the top?

Q A person stuck in a swamp is advised to lie down because:

Q During strong storms, thatched or tin roofs often blow away because:

Q Broad wooden or concrete planks are placed under railway tracks so that—

Q Sometimes, people start bleeding from the nose and mouth in the mountains because:

Q Ink leaks out of a fountain pen in an airplane because:

Q Why does water boil at temperatures below 100°C at high altitudes?

Q The pressure inside a soap bubble is:

Q When the mercury in a barometer suddenly falls, what does it indicate?

Q A hydrogen-filled polythene balloon is released from the Earth's surface. As it rises to higher altitudes in the atmosphere:

Q Why is it harder to breathe on mountains compared to plains?

Q When a Fortin barometer is taken to a high mountain, the mercury level in the tube falls because —

Q Before taking off, an aircraft is run on the runway in order to —

Q A rubber balloon filled with hydrogen bursts when it rises in air because —

Q Food cooks faster in a pressure cooker because —

Q Hooke's Law is related to which of the following?

Q A small drop of oil spreads over water because:

Q What is the principle behind cleaning by soap?

Q When kerosene is poured over stagnant water, mosquitoes reduce because it –

Q When a shaving brush is taken out of water, its bristles stick together. What is the reason for this?

Q Why do small pieces of camphor dance on the surface of water?

Q When detergent is added to pure water, the surface tension—

Q When soap is dissolved in water, the surface tension—

Q Ventilators are installed near the ceiling of a room because—

Assertion (A): Detergents remove oil and dirt from dirty clothes easily.
Reason (R): Detergents increase the surface tension of water.

What is correct?

 Q If the diameter of a capillary tube is doubled, then the height of the water column that rises in it—

 Q What is the unit of viscosity?

Q In a lamp wick, oil rises upward due to:

Q A needle made of iron sinks in water, but a ship floats. On which principle is this based?

Q Archimedes' principle is related to which of the following?

Q When an object is fully or partially immersed in a fluid, there appears to be a loss in its weight, and this apparent loss in weight is equal to the weight of the fluid displaced by the object. This principle is known as:

Q The scientist associated with buoyancy is:

Q The amount of buoyancy experienced by a solid partially or fully submerged in a fluid depends on:

Q A boat will sink if it displaces water equal to its:

Q What is the reason that a piece of iron does not float on the surface of water?

Q The great scientist Archimedes was associated with which country?

Q The reason why water droplets do not stick to oily surfaces is:

Q A piece of ice is floating in a glass of water. When the ice melts, what will happen to the water level?

Q In a capillary tube, a liquid rises higher than water. The reason is:

Q For which of the following is capillarity not the sole reason?

Q 1 kilogram per square centimeter (kg/cm²) pressure is equivalent to—

Q What is measured using cusec?

Q When we pull a bucket of water up from a well, we feel that the bucket —

Q Which of the following is the most elastic?

Q An egg sinks in fresh water but floats in a concentrated salt solution because:

Q Why does soap help in better cleaning of clothes?

Q After removing cream from milk—

Q The amount of matter in a steel ball is its:

Q Hydraulic brakes work on which principle?

Q Bernoulli's principle is a statement of the conservation of which of the following?

Q Why does an iron needle float on the surface of water?

Q The absorption of ink by blotting paper involves—

Q Why is it easier to burst a gas-filled balloon with a needle than with a nail?

Q When similar molecules attract each other, it is called –

Q The excess pressure inside a soap bubble is proportional to –

Q When many small drops of mercury combine to form a single large drop, then the temperature of the drop —

Q If capillary tubes of different radii (r) are dipped in water, then the height (h) of water in the tubes will be in which manner?

Q A liquid will not wet the surface of a solid if the angle of contact is:

Q The cause of the origin of surface tension is —

Q What is the reason a raindrop attains a constant (terminal) velocity?

Q The SI unit of viscosity is how many times that of one poise?

Q Bernoulli's theorem is an application of –

Q A flowing liquid comes to rest after some time. The reason for this is—

Q Which of the following can a hydrogen balloon lift more easily?

Q An oil drop falling through air attains terminal velocity which is —

Q When heat is supplied (temperature increases), the coefficient of viscosity of a gas —

Q What is the dimensional formula of coefficient of viscosity?

Q If capillary tubes of different radii (r) are dipped in water, then the height (h) of the water column in the tubes will be — ?

Q With increase in temperature, the surface tension of a liquid:

पृष्ठ तनाव का मात्रक क्या है?

Q The density of water is 10³ kg/m³. The relative density (specific gravity) of a substance is 2.5. What is the density of the substance in SI units?

Q What is the SI unit of density?

Q At what temperature is the density of water maximum?

Q For an object to float partially submerged in a liquid, the density of the object must be:

What is the unit of strain?

Q What is the dimensional formula of strain?

Q Two wires A and B are made of the same material. The ratio of lengths of wire A to wire B is 1:2,
and the ratio of diameters is 2:1.When both are stretched with the same load, what is the ratio of elongation (extension) in wires A and B?

Q What is the dimensional formula of Young’s modulus of elasticity?

The principle of transmission of pressure is based on:

Q What is the dimensional formula of surface tension?

Q The relative density of a substance is equal to:

Q What is the SI unit of pressure?

Q What is the relation between pressure, force, and area?

Q The pressure applied at any point in a confined fluid is transmitted equally in all directions. This law is called:

Q What is the relationship between pressure, force, and area?

When a solid is compressed, what happens to the potential energy of its atoms?

Q What is the unit of the modulus of elasticity?

Q2 What is the ratio of stress to strain called?

1. Q. What is the dimensional formula of the modulus of elasticity (elasticity coefficient)?