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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
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9th CBSE
IMPORTANT
NCERT Exemplar Science - Class 9>Chapter 1 - Matter in Our Surroundings>Multiple Choice Questions>Q 7
Choose the correct statement from the following.
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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>Multiple Choice Questions>Q 10
In which of the following conditions, the distance between the molecules of hydrogen gas 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.
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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.
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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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