Classes

Class 9 Physics Properties of matter c) In which state of matter the molecules are most closely packed?


Change the way you learn with Maqsad's classes. Local examples, engaging animations, and instant video solutions keep you on your toes and make learning fun like never before!

Class 9Class 10First YearSecond Year
c) In which state of matter the molecules are most closely packed?

viii. Which of the following affects evaporation?(a) temperature(b) surface area of the liquid(c) wind(d) all of the above
viii. Which of the following affects evaporation?(a) temperature(b) surface area of the liquid(c) wind(d) all of the above

viii. Which of the following affects evaporation?(a) temperature(b) surface area of the liquid(c) wind(d) all of the above

7.12 Why does the atmospheric pressure vary with height?
7.12 Why does the atmospheric pressure vary with height?

7.12 Why does the atmospheric pressure vary with height?

7.11 What makes a sucker pressed on a smooth wall sticks to it?
7.11 What makes a sucker pressed on a smooth wall sticks to it?

7.11 What makes a sucker pressed on a smooth wall sticks to it?

9. Evaporation can occur ata) freezing pointb) melting pointc) boiling pointd) all temperatures
9. Evaporation can occur ata) freezing pointb) melting pointc) boiling pointd) all temperatures

9. Evaporation can occur ata) freezing pointb) melting pointc) boiling pointd) all temperatures

iii. Mercury is used as thermometric material because it has(a) uniform thermal expansion(b) low freezing point(c) small heat capacity(d) all the above properties
iii. Mercury is used as thermometric material because it has(a) uniform thermal expansion(b) low freezing point(c) small heat capacity(d) all the above properties

iii. Mercury is used as thermometric material because it has(a) uniform thermal expansion(b) low freezing point(c) small heat capacity(d) all the above properties

EXAMPLE 8.2Change 300 \mathrm{~K} on Kelvin scale into Celsius scale of temperature.
EXAMPLE 8.2Change  300 \mathrm{~K}  on Kelvin scale into Celsius scale of temperature.

EXAMPLE 8.2Change 300 \mathrm{~K} on Kelvin scale into Celsius scale of temperature.

EXAMPLE 8.1What will be the temperature on Kelvin scale of temperature when it is 20^{\circ} \mathrm{C} on Celsius scale?
EXAMPLE 8.1What will be the temperature on Kelvin scale of temperature when it is  20^{\circ} \mathrm{C}  on Celsius scale?

EXAMPLE 8.1What will be the temperature on Kelvin scale of temperature when it is 20^{\circ} \mathrm{C} on Celsius scale?

EXAMPLE 7.1The mass of 200 \mathrm{~cm}^{3} of stone is 500 \mathrm{~g} . Find its density.
EXAMPLE 7.1The mass of  200 \mathrm{~cm}^{3}  of stone is  500 \mathrm{~g} . Find its density.

EXAMPLE 7.1The mass of 200 \mathrm{~cm}^{3} of stone is 500 \mathrm{~g} . Find its density.

EXAMPLE 7.2In a hydraulic press a force of 100 \mathrm{~N} is applied on the piston of a pump of cross-sectional area 0.01 \mathrm{~m}^{2} . Find the force that compresses a cotton bale placed on larger piston of cross-sectional area 1 \mathrm{~m}^{2} .
EXAMPLE 7.2In a hydraulic press a force of  100 \mathrm{~N}  is applied on the piston of a pump of cross-sectional area  0.01 \mathrm{~m}^{2} . Find the force that compresses a cotton bale placed on larger piston of cross-sectional area  1 \mathrm{~m}^{2} .

EXAMPLE 7.2In a hydraulic press a force of 100 \mathrm{~N} is applied on the piston of a pump of cross-sectional area 0.01 \mathrm{~m}^{2} . Find the force that compresses a cotton bale placed on larger piston of cross-sectional area 1 \mathrm{~m}^{2} .

c) In which state of matter the molecules are most closely packed?
c) In which state of matter the molecules are most closely packed?
now playing

c) In which state of matter the molecules are most closely packed?

11. Linear thermal expansion of a solid depends upona) increase in temperatureb) originallengthc) properties of materiald) all of these
11. Linear thermal expansion of a solid depends upona) increase in temperatureb) originallengthc) properties of materiald) all of these

11. Linear thermal expansion of a solid depends upona) increase in temperatureb) originallengthc) properties of materiald) all of these

7.7 Show that atmosphere exerts pressure.
7.7 Show that atmosphere exerts pressure.

7.7 Show that atmosphere exerts pressure.

EXAMPLE 7.6A barge 40 metre long and 8 metre broad whose sides are vertical floats partially loaded in water. If 125000 \mathrm{~N} of cargo is added how many metres will it sink?
EXAMPLE 7.6A barge 40 metre long and 8 metre broad whose sides are vertical floats partially loaded in water. If  125000 \mathrm{~N}  of cargo is added how many metres will it sink?

EXAMPLE 7.6A barge 40 metre long and 8 metre broad whose sides are vertical floats partially loaded in water. If 125000 \mathrm{~N} of cargo is added how many metres will it sink?

EXAMPLE 8.5 A container has 2.5 litres of water at 20^{\circ} \mathrm{C} . How much heat is required to boil the water?
EXAMPLE  8.5 A container has  2.5  litres of water at  20^{\circ} \mathrm{C} . How much heat is required to boil the water?

EXAMPLE 8.5 A container has 2.5 litres of water at 20^{\circ} \mathrm{C} . How much heat is required to boil the water?

vii. According to Hookes law(a) stress x strain = constant(b) stress / strain = constant(c) strain / stress = constant(d) stress = strain
vii. According to Hookes law(a) stress  x  strain  =  constant(b) stress / strain = constant(c) strain  /  stress  =  constant(d) stress = strain

vii. According to Hookes law(a) stress x strain = constant(b) stress / strain = constant(c) strain / stress = constant(d) stress = strain

9. Air at atmospheric pressure of 760 \mathrm{~mm} of \mathrm{Hg} is trapped inside a container available with a moveable piston. When the piston is pulled out slowly so that the volume is increased from 100 \mathrm{dm}^{3} to 150 \mathrm{dm}^{3} the temperature remaining constant. What will be the pressure of the air becomes?
9. Air at atmospheric pressure of  760 \mathrm{~mm}  of  \mathrm{Hg}  is trapped inside a container available with a moveable piston. When the piston is pulled out slowly so that the volume is increased from  100 \mathrm{dm}^{3}  to  150 \mathrm{dm}^{3}  the temperature remaining constant. What will be the pressure of the air becomes?

9. Air at atmospheric pressure of 760 \mathrm{~mm} of \mathrm{Hg} is trapped inside a container available with a moveable piston. When the piston is pulled out slowly so that the volume is increased from 100 \mathrm{dm}^{3} to 150 \mathrm{dm}^{3} the temperature remaining constant. What will be the pressure of the air becomes?

7.1 A wooden block measuring 40 \mathrm{~cm} \times 10 \mathrm{~cm} \times 5 \mathrm{~cm} has a mass 850 g. Find the density of wood. \left(425 \mathrm{kgm}^{3}\right)
7.1 A wooden block measuring  40 \mathrm{~cm} \times 10 \mathrm{~cm} \times 5 \mathrm{~cm}  has a mass 850 g. Find the density of wood. \left(425 \mathrm{kgm}^{3}\right)

7.1 A wooden block measuring 40 \mathrm{~cm} \times 10 \mathrm{~cm} \times 5 \mathrm{~cm} has a mass 850 g. Find the density of wood. \left(425 \mathrm{kgm}^{3}\right)

ii. Which of the substances is the lightest one?(a) copper(b) mercury(c) aluminum (d) lead
ii. Which of the substances is the lightest one?(a) copper(b) mercury(c) aluminum (d) lead

ii. Which of the substances is the lightest one?(a) copper(b) mercury(c) aluminum (d) lead

c) Which state of matter is highly incompressible?
c) Which state of matter is highly incompressible?
video locked

c) Which state of matter is highly incompressible?

10. Rate of evaporation of a liquid can be increased bya) increasing humidityb) decreasing temperaturec) increasing its boiling pointd) decreasing atmospheric pressure
10. Rate of evaporation of a liquid can be increased bya) increasing humidityb) decreasing temperaturec) increasing its boiling pointd) decreasing atmospheric pressure
video locked

10. Rate of evaporation of a liquid can be increased bya) increasing humidityb) decreasing temperaturec) increasing its boiling pointd) decreasing atmospheric pressure

7.17 What is meant by elasticity?
7.17 What is meant by elasticity?
video locked

7.17 What is meant by elasticity?

EXAMPLE 8.4 Convert 100^{\circ} \mathrm{F} into the temperature on Celsius scale.
EXAMPLE  8.4 Convert  100^{\circ} \mathrm{F}  into the temperature on Celsius scale.
video locked

EXAMPLE 8.4 Convert 100^{\circ} \mathrm{F} into the temperature on Celsius scale.

Worked Example 1A cylinder contains 60 \mathrm{~cm}^{3} of air at a pressure of 140 \mathrm{kPa} . What will its volume be if the pressure on it is increased to 420 \mathrm{kPa} ?
Worked Example 1A cylinder contains  60 \mathrm{~cm}^{3}  of air at a pressure of  140 \mathrm{kPa} . What will its volume be if the pressure on it is increased to  420 \mathrm{kPa}  ?
video locked

Worked Example 1A cylinder contains 60 \mathrm{~cm}^{3} of air at a pressure of 140 \mathrm{kPa} . What will its volume be if the pressure on it is increased to 420 \mathrm{kPa} ?

iii. SI unit of pressure is pascal which is equal to:(a) 10^{4} \mathrm{Nm}^{-2} (b) 1 \mathrm{Nm}^{-2} (C) 10^{2} \mathrm{Nm}^{-2} (d) 10^{3} \mathrm{Nm}^{-2}
iii. SI unit of pressure is pascal which is equal to:(a)  10^{4} \mathrm{Nm}^{-2} (b)  1 \mathrm{Nm}^{-2} (C)  10^{2} \mathrm{Nm}^{-2} (d)  10^{3} \mathrm{Nm}^{-2}
video locked

iii. SI unit of pressure is pascal which is equal to:(a) 10^{4} \mathrm{Nm}^{-2} (b) 1 \mathrm{Nm}^{-2} (C) 10^{2} \mathrm{Nm}^{-2} (d) 10^{3} \mathrm{Nm}^{-2}

7.1 Encircle the correct answer from the given choices:i. In which of the following state molecules do not leave their position?(a) solid(b) liquid(c) gas(d) plasma
7.1 Encircle the correct answer from the given choices:i. In which of the following state molecules do not leave their position?(a) solid(b) liquid(c) gas(d) plasma
video locked

7.1 Encircle the correct answer from the given choices:i. In which of the following state molecules do not leave their position?(a) solid(b) liquid(c) gas(d) plasma

EXAMPLE 7.7 A steel wire 1 \mathrm{~m} long and cross-sectional area 5 \times 10^{-5} \mathrm{~m}^{2} is stretched through 1 \mathrm{~mm} by a force of 10000 N. Find the Youngs modulus of the wire.
EXAMPLE  7.7 A steel wire  1 \mathrm{~m}  long and cross-sectional area  5 \times 10^{-5} \mathrm{~m}^{2}  is stretched through  1 \mathrm{~mm}  by a force of 10000 N. Find the Youngs modulus of the wire.
video locked

EXAMPLE 7.7 A steel wire 1 \mathrm{~m} long and cross-sectional area 5 \times 10^{-5} \mathrm{~m}^{2} is stretched through 1 \mathrm{~mm} by a force of 10000 N. Find the Youngs modulus of the wire.

7.10 Why water is not suitable to be used in a barometer?
 7.10 Why water is not suitable to be used in a barometer?
video locked

7.10 Why water is not suitable to be used in a barometer?

7. A gas in a container of fixed volume is heated. What happens to the molecules of the gas?a) They collide less frequently.b) They expand.c) They move faster.d) They move further apart.
7. A gas in a container of fixed volume is heated. What happens to the molecules of the gas?a) They collide less frequently.b) They expand.c) They move faster.d) They move further apart.
video locked

7. A gas in a container of fixed volume is heated. What happens to the molecules of the gas?a) They collide less frequently.b) They expand.c) They move faster.d) They move further apart.

7.18 State Archimedes principle.
 7.18 State Archimedes principle.
video locked

7.18 State Archimedes principle.

MDCAT/ ECAT question bank