Match column I with column II and choose the correct option from the given codes. Column I Column I P. Hot tea poured in saucer gets cooled faster. (i) Evaporation increases with increase in temperature. Q. We feel more cold after a hot water bath than a cold water bath. (ii) Evaporation increases with decrease in humidity. R. Water is cool in earthen pitcher during dry hot day. (iii) Evaporation increases with increase in wind speed. S. We feel comfortable under a moving fan in summer. (iv) Evaporation increases with increase in surface area.

P - (ii), Q - (i), R - (iii), S - (iv)

P - (iv), Q - (ii), R - (iii), S - (i)

An experiment is performed as shown in the given figure. The conclusion we can draw from the given experiment is that:

Particles of salt get into the spaces between the particles of water

MEDIUM

9th Foundation

IMPORTANT

Earn 100

Which of the following statements are correct?

I. Temperature changes during the change of a state.
II. Dry ice gets converted directly into gaseous state under normal atmospheric conditions.
III. Higher boiling point of liquid indicates weaker intermolecular forces.
IV. Latent heat of vaporisation is generally higher than the latent heat of fusion for a substance.

41.67% studentsanswered this correctly

Important Questions on Matter in Our Surroundings

MEDIUM

9th Foundation

IMPORTANT

NSO Science Olympiad Workbook Grade 9>Chapter 1 - Matter in Our Surroundings>EXERCISES>Q 7

Read the given statements and mark the correct option.

Statement 1: Solid ${CO}_{2}$ changes its state when exposed to air.
Statement 2: ${CO}_{2}$ undergoes sublimation.

MEDIUM

9th Foundation

IMPORTANT

NSO Science Olympiad Workbook Grade 9>Chapter 1 - Matter in Our Surroundings>EXERCISES>Q 8

Match column I with column II and choose the correct option from the given codes.

Column I		Column I
P.	Hot tea poured in saucer gets cooled faster.	(i)	Evaporation increases with increase in temperature.
Q.	We feel more cold after a hot water bath than a cold water bath.	(ii)	Evaporation increases with decrease in humidity.
R.	Water is cool in earthen pitcher during dry hot day.	(iii)	Evaporation increases with increase in wind speed.
S.	We feel comfortable under a moving fan in summer.	(iv)	Evaporation increases with increase in surface area.

MEDIUM

9th Foundation

IMPORTANT

NSO Science Olympiad Workbook Grade 9>Chapter 1 - Matter in Our Surroundings>EXERCISES>Q 9

Which of the following curves would be obtained on heating solid naphthalene to a temperature which is above its melting point?

EASY

9th Foundation

IMPORTANT

NSO Science Olympiad Workbook Grade 9>Chapter 1 - Matter in Our Surroundings>EXERCISES>Q 10

What is the correct increasing order of molecular motion (kinetic energy) of particles in the following?

EASY

9th Foundation

IMPORTANT

NSO Science Olympiad Workbook Grade 9>Chapter 1 - Matter in Our Surroundings>EXERCISES>Q 11

An organic compound

{}^{'}X^{'}

has a melting point of

- 33 ° C

and a boiling point of

66 ° C

. The physical states of substance

{}^{'}X^{'}

at temperature

- 100 ° C, 0 ° C

and

100 ° C

are respectively

EASY

9th Foundation

IMPORTANT

NSO Science Olympiad Workbook Grade 9>Chapter 1 - Matter in Our Surroundings>EXERCISES>Q 12

An experiment is performed as shown in the given figure.

Question Image

The conclusion we can draw from the given experiment is that:

MEDIUM

9th Foundation

IMPORTANT

NSO Science Olympiad Workbook Grade 9>Chapter 1 - Matter in Our Surroundings>EXERCISES>Q 13

Fill in the blanks

P, Q, R

and

S

left in the table with appropriate words.

Properties	Solid	Liquid	Gas
Inter-particle spaces	Very less	Comparatively large	$P$
Intermolecular forces	$Q$	Weak	Very weak
Compressibility	$R$	Very small	High
Diffusion	Negligible	$S$	Very fast

	P	Q	R	S
(A)	Very large	Strong	Negligible	Slow
(B)	Large	Weak	Small	Fastest
(C)	Less	Strong	High	Slow
(D)	Large	Strong	Strong	Fast

MEDIUM

9th Foundation

IMPORTANT

NSO Science Olympiad Workbook Grade 9>Chapter 1 - Matter in Our Surroundings>EXERCISES>Q 14

Ritwik was given four inflammable substances $P, Q, R$ and $S$ . He was asked to hand over them to Ramesh who was the resident of a hot area (temperature, $46 ° C$ ). Ritwik collected the data about the substances as shown in the table. Which substances Ritwik should not carry to the hot area where Ramesh lives?

Substance	Ignition Temperature
$P$	$40 ° C$
$Q$	$38 ° C$
$R$	$52 ° C$
$S$	$59 ° C$

Important Questions on Matter in Our Surroundings

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