Olympiad Science - Matter in Our Surroundings
Exam Duration: 45 Mins Total Questions : 30
A student poured an equal amount of water into 4 containers as shown below.
What result does this experiment show?
- (a)
Water has definite volume.
- (b)
Water has no definite shape.
- (c)
Water has definite mass.
- (d)
Water has no definite volume.
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.
Match the entries in Column I with those in Column II.
Column-I | Column -II | |
a. | Evaporation | Liquid to gas at a fixed temperature |
b. | Boiling | Solid to gas |
c. | Sublimation | Gas to solid |
d. | Hoar frost | Liquid to gas at any temperature |
- (a)
a-4,b-l,c-2,d-3
- (b)
a-l,b-2,c-3,d-4
- (c)
a-2, b-3, c-4, d-l
- (d)
a-4, b-I, c-3, d-2
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
Which of the following statements is NOT true?
- (a)
All forms of matter have volume.
- (b)
All forms of matter have colour.
- (c)
All forms of matter have mass.
- (d)
Matter can be living or non-living.
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.
Calculate the temperature at which both the Celsius and Fahrenheit scales show the same reading?
- (a)
40 K
- (b)
100 oF
- (c)
-40 °C
- (d)
-100 °C
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
Identify the normal temperature of the human body.
- (a)
40oF
- (b)
40°C
- (c)
37°C
- (d)
37°F
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
What does conversion of 475 K into celsius scale give?
- (a)
301.85 °C
- (b)
273°C
- (c)
207 °C
- (d)
201.85 °C
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