# CBES Board Class 9/PHYSICAL STATES OF MATTER MCQS CLASS 9 Sample Test,Sample questions

## Question: ``` Boiling point is the temperature at which vapor pressure is ```

1. more than external pressure

2. less than external pressure

3. not related to external pressure

4. equal to external pressure

## Question: ``` The mathematical expression that describes Boyles law is ```

1. PV = constant

2. V * constant = P

3. P * constant = V

4. V ? P = constant

## Question: ``` The molecules of liquid which escape first have ```

1. highest kinetic energy

2. lowest kinetic energy

3.moderate kinetic energy

4. infinite kinetic energy

1. 100.345 Pa

2. 760 kPa

3. 101.325 kPa

4.1.01325 mmHg

1.N2

2.SO2

3.O2

4.O3

## Question: ```An ordered repeating three-dimensional arrangement of particles makes up a ```

1.crystalline solid

2.amorphous solid

3.non crystalline solid

4.none of above

## Question: ```As the molecular mass of gasses increases their density ```

1. decreases

2. increases

3. remains constant

4. none of above

## Question: ```At constant pressure the 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. temperature remains constant

## Question: ```At constant temperature when pressure is decreased the average kinetic energy of gas molecules ```

1.decreases

2.remains unchanged

3.decreases

4.becomes two fold

1. 100 �C

2. 90 �C

3.80 �C

4. 70 �C

1. sublimation

2. evaporation

3.condensation

4. boiling

1. 1 atm

2. 4 atm

3. 0.5 atm

4. 2 atm

1.effusion

2.diffusion

3.mobility

4.pressure

## Question: ```If the liquid is heated to increase the kinetic energy then the liquid will ```

1. evaporate slowly

2. evaporate faster

3. not evaporate

4.boil

1.increases

2.decreases

3.remains same

4.none of above

1. 1 atm

2. 2 atm

3. 3 atm

4. 4 atm

## Question: ```In graphite the carbon atoms are arranged in layers of ```

1.pentagonal arrays

2.heptagonal arrays

3.octagonal arrays

4.hexagonal arrays

1. increases

2. remains same

3.becomes double

4.decreases

## Question: ```On increasing the temperature of amorphous solid they ```

1. melt at specific temperature

2. soften gradually

3. break at specific temperature

4. boil at specific temperature

1. isotopes

2. crystals

3.allotropes

4. amorphous

1.T2

2.?T

3.T

4.2T

1. Galileo

2. Robert Boyle

3. Charles

4. Torricelli

1.diffusion

2.effusion

3.concentration

4.mobility

## Question: ```The 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

1. diffusion

2. concentration

3. effusion

4. mobility

1.fixed

2. not fixed

3. not sliding

4. none of above

## Question: ```The pressure that vapors apply on the surface of the liquid at equilibrium is called ```

1.torr

2. vapor pressure

3. liquid pressure

4. condensation

1. condensation

2. evaporation

3. boiling

4. sublimation

1. evaporation

2. sublimation

3. condensation

4. boiling

## Question: ```The temperature at which the solid starts melting is called ```

1. boiling point

2. freezing point

3. melting point

4. sublimating point

## More MCQS

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