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Test: Matter In Our Surroundings (Hard) - Class 9 MCQ


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Test: Matter In Our Surroundings (Hard) - Question 1

Which of the following decreases the rate of evaporation?

Detailed Solution for Test: Matter In Our Surroundings (Hard) - Question 1
When temperature and wind speed are constant, but humidity increases, the rate of evaporation will decrease.When wind speed and humidity stay constant, and temperature increases, the evaporation rate will increase because warmer air can hold more water vapour than colder air.

Test: Matter In Our Surroundings (Hard) - Question 2

The Rate Of Evaporation Does Not Depend

Detailed Solution for Test: Matter In Our Surroundings (Hard) - Question 2
The evaporation rate does not depend on the type of particles because it completely depends upon the liquid's surface area if the surface area is large, evaporation will be maximum. Evaporation depends upon wind speed; if the wind is flowing at higher speed, then the evaporation rate increases. Same will be applied in case Of Humidity. Humidity Decreases Evaporation.

Test: Matter In Our Surroundings (Hard) - Question 3

Evaporation Is a ________phenomenon.

Test: Matter In Our Surroundings (Hard) - Question 4

Change Of A Liquid Into Vapors at any temperature below its boiling point is called as ______________.

Detailed Solution for Test: Matter In Our Surroundings (Hard) - Question 4
In the case of liquids, as mall fraction of particles at the surface, having higher kinetic energy, can break away from the forces of attraction of other particles and gets converted into vapour.This phenomenon of change of a liquid into vapours at any temperature below its boiling point is called evaporation.

Test: Matter In Our Surroundings (Hard) - Question 5

A strip of magnesium metal is burnt in the flame. It is observed that :

Detailed Solution for Test: Matter In Our Surroundings (Hard) - Question 5

It burns with a bright dazzling flame and produces magnesium oxide after burning.

Test: Matter In Our Surroundings (Hard) - Question 6

For determining the melting point of ice, the thermometer should be kept :

Detailed Solution for Test: Matter In Our Surroundings (Hard) - Question 6
The bulb of the thermometer should be kept surrounded by ice cubes. Note temperature by keeping your eyes in line with the level of mercury.

Test: Matter In Our Surroundings (Hard) - Question 7

A student takes some water in a beaker and heats it over a flame for determining its boiling point. He keeps on taking its temperature reading. He observes that the temperature of the water :

Detailed Solution for Test: Matter In Our Surroundings (Hard) - Question 7
It is a matter that the temperature increases till the substance are in its original state.

Test: Matter In Our Surroundings (Hard) - Question 8

Which of the following matters?

Detailed Solution for Test: Matter In Our Surroundings (Hard) - Question 8
Matter, material, stuff, substance refer to that of which physical objects are composed (though all these terms are also used abstractly). As distinct from mind and spirit, Matter is a broad word that applies to anything perceived, or known to be occupying space: solid matter; gaseous matter.

Test: Matter In Our Surroundings (Hard) - Question 9

Particles of matter are

Detailed Solution for Test: Matter In Our Surroundings (Hard) - Question 9
Matter on Earth is in the form of solid, liquid, or gas. Solids, liquids, and gases are made of tiny particles called atoms and molecules. In a solid, the particles are very attracted to each other. They are close together and vibrate in position but don't move past one another.

Test: Matter In Our Surroundings (Hard) - Question 10

The property to flow is unique to fluids. Which one of the following statements is correct?

Detailed Solution for Test: Matter In Our Surroundings (Hard) - Question 10
Gases and liquids tend to flow and therefore behave like fluids.

Test: Matter In Our Surroundings (Hard) - Question 11

On converting 25°C, 38°C and 66°C to Kelvin scale, the correct sequence of temperature will be

Detailed Solution for Test: Matter In Our Surroundings (Hard) - Question 11
273 + 25 = 298 K, 273 + 38 = 311 K, 273 + 66 = 339 K

Test: Matter In Our Surroundings (Hard) - Question 12

The boiling points of diethyl ether, acetone and n-butyl alcohol are 35°C, 56°C and 118°C respectively. Which one of the following correctly represents their boiling points in the Kelvin scale?

Detailed Solution for Test: Matter In Our Surroundings (Hard) - Question 12
273 + 35 = 308 K, 273 + 56 = 329 K, 273 + 118 = 391 K.

Test: Matter In Our Surroundings (Hard) - Question 13

In which of the following conditions, the distance between hydrogen gas molecules would increase?

(i) Increasing pressure on hydrogen contained in a closed container

(ii) Some hydrogen gas leaking out of the container

(iii) Increasing the volume of the container of hydrogen gas

(iv) Adding more hydrogen gas to the container without increasing the volume of the container

Detailed Solution for Test: Matter In Our Surroundings (Hard) - Question 13
By removing either hydrogen gas from the container or increasing the container's volume, the molecules' distance increases.

Test: Matter In Our Surroundings (Hard) - Question 14

The boiling point of a gas is − 80ºC. This temperature is equivalent to

Detailed Solution for Test: Matter In Our Surroundings (Hard) - Question 14
K = 273 + °C = 273 + (– 80) = 273 – 80 = 193 K

Test: Matter In Our Surroundings (Hard) - Question 15

The standard room temperature is taken as

Detailed Solution for Test: Matter In Our Surroundings (Hard) - Question 15
The standard room temperature is taken as 25°C or 298 K.

Test: Matter In Our Surroundings (Hard) - Question 16

Which of the following factors does not increase the rate of evaporation?

Detailed Solution for Test: Matter In Our Surroundings (Hard) - Question 16
Increase in humidity decreases the rate of evaporation.

Test: Matter In Our Surroundings (Hard) - Question 17

The boiling point of water at normal atmospheric pressure is

Detailed Solution for Test: Matter In Our Surroundings (Hard) - Question 17
The boiling point of water at normal atmospheric pressure is 100°C or 373 K.

Test: Matter In Our Surroundings (Hard) - Question 18

300 K temperature may be written in the Celsius scale as

Detailed Solution for Test: Matter In Our Surroundings (Hard) - Question 18
K = 273 + °C

∴ °C = K – 273 = 300 – 273 = 27°C

Test: Matter In Our Surroundings (Hard) - Question 19

The three states of matter are:

Detailed Solution for Test: Matter In Our Surroundings (Hard) - Question 19
solid, liquid and gas are three phases of all matter.

Test: Matter In Our Surroundings (Hard) - Question 20

What is the correct term for the phase change from gas directly into solid?

Detailed Solution for Test: Matter In Our Surroundings (Hard) - Question 20

Deposition is the phase transition in which gas transforms into solid without passing through the liquid phase

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