Science - Matter in Our Surroundings
Exam Duration: 45 Mins Total Questions : 30
Which of the following has a direct effect on the K.E. of particles?
- (a)
Pressure
- (b)
Potential energy
- (c)
Temperature
- (d)
All of the above
Look at the venn diagram given below.
Which of the following can be placed in 'Z'?
- (a)
Water
- (b)
Dry ice
- (c)
Salt
- (d)
Jelly
Based on the statements given below choose the correct answer.
P. Some sugar can be added to a glassful of water without causing an overflow.
Q. Liquids have spaces present between the molecules.
- (a)
P and Q are true and Q explains P.
- (b)
P and Q are true but Q does not explain P.
- (c)
Only P is true.
- (d)
Only Q is true.
What happens to a substance when the space between its particles is decreased?
- (a)
The volume of the substance increases.
- (b)
The volume of the substance decreases.
- (c)
The mass of the substance increases.
- (d)
The mass of the substance decreases.
Which of the following have a regular, repeated molecular pattern and large number of free surfaces in three dimensional space?
- (a)
Solids and liquids
- (b)
Liquids and gases
- (c)
Solids
- (d)
Gases
Three containers X, Y and Z as shown below were filled with water and then left near an open window. The purpose was to find out whether the exposed surface area of the water affects the rate of evaporation of water.
Why was the experiment NOT a fair one?
- (a)
The exposed surface areas were different.
- (b)
Different types of containers were used.
- (c)
The amount of water in the containers was different.
- (d)
The containers were not covered.
What happens to the inter-particle attractive forces with an increase in the distance between the particles?
- (a)
They increase.
- (b)
They decrease.
- (c)
They increase moderately.
- (d)
They remain the same.
Bromine has a melting point of -7.2 °C and a boiling point of 59°C. At what temperature will bromine have a definite volume but no definite shape?
- (a)
65 °C
- (b)
36°C
- (c)
-26°C
- (d)
98 K
What happens when a solid melts?
- (a)
Its molecules move farther apart.
- (b)
Its molecules move closer.
- (c)
The movement of its molecules decreases.
- (d)
The temperature decreases although heat is supplied.
Why does a gas from a small container when transferred to a larger container occupy all the space available?
- (a)
Gas has no definite mass.
- (b)
Gas has no definite shape.
- (c)
Gas has no definite volume.
- (d)
Gas has no definite density.
Why can't solids be compressed?
- (a)
The inter-particle attractive forces are very weak.
- (b)
The movement of the constituent particles are not restricted.
- (c)
The constituent particles are closely packed.
- (d)
None of the above.
Find the rise in temperature of 1 kg of water if 1000 J of heat is supplied to it.
- (a)
\(\left( \frac { 1000 }{ 4186 } \right) ^{ o }C\)
- (b)
\(\left( \frac { 4186 }{ 1000 } \right) ^{ o }C\)
- (c)
(1000 x 4186)oC
- (d)
(4186 - 1000)oC
When the vapour pressure of a liquid is equal to the atmospheric pressure, what happens to the liquid?
- (a)
The liquid freezes.
- (b)
The liquid evaporates.
- (c)
The liquid boils.
- (d)
The liquid does not undergo any change.
Which of the following water molecules W, X, Y or Z can easily escape to form water vapour?
- (a)
W
- (b)
X
- (c)
Y
- (d)
Z
Which of the following statements is TRUE of matter?
- (a)
The states of matter are interconvertible.
- (b)
Force of attraction varies from one kind of matter to another.
- (c)
The states of matter can be changed by changing the temperature or pressure.
- (d)
All of the above
Which of the following will diffuse faster than the others?
- (a)
Water
- (b)
Petrol
- (c)
Perfume
- (d)
Milk
What is the 5.1. unit of temperature?
- (a)
Centigrade
- (b)
Fahrenheit
- (c)
Kelvin
- (d)
All of the above
Which of the following processes involve absorption of energy?
(i) Boiling
(ii) Sublimation
(iii) Condensation
- (a)
Only (i) and (ii)
- (b)
Only (ii) and (iii)
- (c)
Only (i) and (iii)
- (d)
(i), (ii) and (iii)
When does the thermal energy of a body increase?
- (a)
When the K.E.of the body decreases.
- (b)
When the P.E.of the body increases
- (c)
When the mechanical energy of the body decreases
- (d)
When the K.E.ofmolecules in a body increases
A student finds that as he blows air into a balloon, it becomes bigger. What inference can he make from the above?
- (a)
Air is a gas.
- (b)
Air has mass.
- (c)
Air is matter.
- (d)
Air occupies space.
What happens when ice is converted into water?
- (a)
Heat is absorbed.
- (b)
Heat is released.
- (c)
Temperature increases.
- (d)
Temperature decreases
Identify the freezing point of pure water.
- (a)
-4°C
- (b)
100°C
- (c)
10 °C
- (d)
O°C
Under what conditions, can a gas be cooled and converted into liquid?
- (a)
At its critical temperature by decreasing pressure on it
- (b)
Above its critical temperature by increasing pressure on it
- (c)
Above its critical temperature by decreasing pressure on it
- (d)
Below its critical temperature by increasing pressure on it
Which of the following substances can be compressed?
- (a)
Sponge
- (b)
Stone
- (c)
Magnet
- (d)
Diamond
A class teacher demonstrates the effect of impurities on the boiling point of water using the arrangement of apparatus as shown below.
What could be the probable thermometer readings recorded during the experiment?
- (a)
97°C
- (b)
100°C
- (c)
102°C
- (d)
99°C
At what temperature should all the gases occupy zero volume?
- (a)
0°C
- (b)
-273°C
- (c)
273°C
- (d)
100°C
On which of the following factors, does the molecular arrangement of a substance depend?
- (a)
Temperature and pressure
- (b)
Concentration and temperature
- (c)
Temperature, pressure and concentration
- (d)
Volume and pressure
Which of the following properties is different for solids, liquids and gases?
- (a)
Movement of molecules
- (b)
Particle size of the substance
- (c)
Mass of the substance
- (d)
Energy changes
The figures given below show the state of molecules of different types of matter. Which figure shows that water is being heated?
- (a)
- (b)
- (c)
- (d)
What could be the diameters of the molecules of matter?
- (a)
10-7 m
- (b)
10-11 m
- (c)
10-9 m
- (d)
10-15 m