# Chapter 05: States of Matter

MCQ: Process in which solid changes directly in to vapors without changing in liquid state is called

1. condensation
2. evaporation
3. boiling
4. sublimation

MCQ: Conversion of a liquid to a gas at all temperatures is called

1. sublimation
2. evaporation
3. condensation
4. boiling

MCQ: Temperature at which solid starts melting is called

1. boiling point
2. freezing point
3. melting point
4. none of above

MCQ: At constant pressure average kinetic energy of gas molecules increases 2 times if

1. temperature is increased by 2 times
2. temperature is halved
3. no change in temperature
4. none of above

MCQ: Average kinetic energy of gas molecules is directly proportional to

1. T2
2. √T
3. T
4. 2T

MCQ: Mathematical expression that describes Boyle’s law is

1. PV = constant
2. V * constant = P
3. P * constant = V
4. V ⁄ P = constant

MCQ: For a certain reaction PV = 2 dm3 atm and volume is 4 dm3 then corresponding pressure is

1. 1 atm
2. 4 atm
3. 0.5 atm
4. 2 atm

MCQ: Molecules of liquid which escape first have

1. highest kinetic energy
2. lowest kinetic energy
3. moderate kinetic energy
4. infinite kinetic energy

MCQ: Pressure that vapors apply on surface of liquid at equilibrium is called

1. torr
2. vapor pressure
3. liquid pressure
4. condensation

MCQ: On increasing temperature of amorphous solid they

1. melt at specific temperature
3. break at specific temperature
4. boil at specific temperature

CQ: Movement of molecules from higher concentration to lower concentration is called

1. diffusion                                C.concentration
2. effusion                                 D.mobility

MCQ: At mount Everest water boils at

1. 100°C                                    C.90°C
2. 80°C                                       D.70°C

MCQ: Barometer is invented by

1. Galileo                                   C.Robert Boyle
2. Charles                                  D. Torricelli

MCQ: Melting and freezing of a substance occurs as

1. same temperature
2. more than melting point
3. more than freezing point
4. less than boiling point

MCQ: If liquid is heated to increase kinetic energy then liquid will

1. evaporate slowly
2. evaporate faster
3. will not evaporate
4. boil

MCQ: Solids whose atoms arrange themselves in different forms are

1. isotopes                 C.crystals
2. allotropes              D.amorphous

MCQ: Process in which vapor molecules are recaptured by molecules at liquid surface is called

1. evaporation
2. sublimation
3. condensation
4. boiling

MCQ: 1 atmospheric pressure is equal to

1. 100.345 Pa                            C.760 kPa
2. 101.325 kPa                         D.1.01325 mmHg

MCQ: A gas that shields living things on surface of earth from harmful UV radiation is

1. N2
2. SO2
3. O2
4. O3

MCQ: In graphite carbon atoms are arranged in layers of

1. pentagonal arrays
2. heptagonal arrays
3. octagonal arrays
4. hexagonal arrays

MCQ: As molecular mass of gasses increases their density

1. decreases                               C.increases
2. remains unchanged             D.none of above

MCQ: Position of liquid molecules are

1. fixed                                       C.not fixed
2. not sliding                              D.none of above

MCQ: On applying pressure volume of gas

1. increases                                C. remains same
2. becomes double                   D.decreases

MCQ: Boiling point is temperature at which

1. vapor pressure is more than external pressure
2. Vapor pressure is less than external pressure
3. Vapor pressure is not related to external pressure
4. Vapor pressure is equal to external pressure

MCQ: In pressure cooker pressure applied is

1. 1 atm
2. 2 atm
3. 3 atm
4. 4 atm

MCQ: If temperature of any gas is increased its volume

1. Increases                               C.decreases
2. remains same                       D.none of above

MCQ: An ordered, repeating three dimensional arrangement of particles makes up a

1. crystalline solid
2. amorphous solid
3. can be both A and B
4. none of above

MCQ: Escape of gas molecules from a small hole one after other is called

1. diffusion                                                C.effusion
2. concentration                                       D.mobility

MCQ: Force exerted by a gas on unit area of container is called

1. effusion
2. diffusion
3. mobility
4. pressure

MCQ: At constant temperature, when pressure is decreased average kinetic energy of gas molecules

1. decreases
2. remains unchanged
3. decreases
4. becomes two fold