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9th CBSE
IMPORTANT
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During summer, water kept in an earthen pot becomes cool because of the phenomenon of

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Important Questions on Matter in Our Surroundings

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9th CBSE
IMPORTANT
NCERT Exemplar Science - Class 9>Chapter 1 - Matter in Our Surroundings>Multiple Choice Questions>Q 5
A few substances are arranged in the increasing order of forces of attraction' between their particles. Which one of the following represents a correct arrangement?
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9th CBSE
IMPORTANT
NCERT Exemplar Science - Class 9>Chapter 1 - Matter in Our Surroundings>Multiple Choice Questions>Q 6
On converting 25°C,38°C and 66°C to Kelvin scale, the correct sequence of temperature will be
EASY
9th CBSE
IMPORTANT
NCERT Exemplar Science - Class 9>Chapter 1 - Matter in Our Surroundings>Multiple Choice Questions>Q 8
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 Kelvin scale?
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9th CBSE
IMPORTANT
NCERT Exemplar Science - Class 9>Chapter 1 - Matter in Our Surroundings>Multiple Choice Questions>Q 9
Which condition out of the following will increase the evaporation of water?
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9th CBSE
IMPORTANT
NCERT Exemplar Science - Class 9>Chapter 1 - Matter in Our Surroundings>Short Answer Questions>Q 11
A sample of water under study was found to boil at 102°C at normal temperature and pressure. Is the water pure? Will this water freeze at 0°C? Comment.
MEDIUM
9th CBSE
IMPORTANT
NCERT Exemplar Science - Class 9>Chapter 1 - Matter in Our Surroundings>Short Answer Questions>Q 12

A student heats a beaker containing ice and water. He measures the temperature of the content of the beaker as a function of time. Which of the following figure would correctly represent the result? Justify your choice.

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9th CBSE
IMPORTANT
NCERT Exemplar Science - Class 9>Chapter 1 - Matter in Our Surroundings>Short Answer Questions>Q 13
Evaporation of a liquid at room temperature leads to a  _____effect.
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9th CBSE
IMPORTANT
NCERT Exemplar Science - Class 9>Chapter 1 - Matter in Our Surroundings>Short Answer Questions>Q 13
The phenomenon of change of a liquid into the gaseous state at any temperature below its boiling point is called _____.