81
Match the term in
List I with its definition in
List II .
List-I List-II
a. Sublimation
1. The change of a gas to a solid
b. Deposition
2. The chance of a gas to a liquid
c. Condensation
3. The change of a liquid to a gas
d. Vaporisation
4. The change of a solid to a gas
A)
a-2, b-3, c-4, d-1
B)
a-1, b-2, c-3, d-4
C)
a-4, b-1, c-2, d-3
D)
a-3, b-4, c-1, d-2
Answer & Solution
Answer: Option
C
82
For an ideal gas, which one of the following statements is not true?
A)
The speed of all gas molecules is same
B)
The kinetic energies of all gas molecules are not same
C)
The potential energy of the gas molecules is zero
D)
There is no interactive force between the molecules
Answer & Solution
Answer: Option
A
83
In winter season specially in cold countries, ethylene glycol is added to water in the radiators of cars. It results in
A)
reducing the viscosity of water
B)
lowering the freezing point of water
C)
lowering the boiling point of water
D)
reducing the specific heat of water
Answer & Solution
Answer: Option
B
A)
suspended solid particles in air
B)
pollutant gas, present in air
C)
microbes, present in air
D)
green house gas present in air
Answer & Solution
Answer: Option
A
85
Which of the following is a monoatomic gas?
A)
Oxygen
B)
Neon
C)
Nitrogen
D)
Fluorine
Answer & Solution
Answer: Option
B
86
When the milk is churned vigorously the cream from it is separated out due to
A)
gravitational force
B)
frictional force
C)
centrifugal force
D)
centripetal force
Answer & Solution
Answer: Option
C
87
Impure camphor is purified by
A)
sublimation
B)
fractional crystallisation
C)
fractional distillation
D)
steam distillation
Answer & Solution
Answer: Option
A
88
Which of the following is used to remove the green colour from glass?
A)
Silicon dioxide
B)
Titanium dioxide
C)
Sulphur dioxide
D)
Manganese dioxide
Answer & Solution
Answer: Option
D
89
Gelatin is mostly used in making ice creams in order to
A)
prevent making a colloid
B)
stabilise the colloid and prevent crystallisation
C)
stabilises mixture
D)
enrich the aroma
Answer & Solution
Answer: Option
B
90
Rate of evaporation increases with
A)
an increase of surface area
B)
an increase in humidity
C)
a decrease in wind speed
D)
a decrease of temperature
Answer & Solution
Answer: Option
A
