Andhra Pradesh (English Medium) Std 9 Study Materials, Online Learning, Question Papers, Classnotes, Practice Test, MCQ | Smartindia Educational Program : www.smartindia.net.in

Question-1
At constant temperature , volume of given mass of gas _______ with increase in pressure.

(A) increases	(B) decreases
(C) remain constant	(D) none

Question-2
Temperature O⁰c and pressure latmosphere is known as ___________.

(A) NTP	(B) STP
(C) Both	(D) None

Question-3
The rate of diffusion is inversely proportional to the ____________ of the molecular weight of a gas (M).

(A) Constant multiple	(B) Cube
(C) Square	(D) Square root

Question-4
1 atmosphere is equal to 1 ____________.

(A) torr	(B) pascal
(C) cm	(D) mm

Question-5
________ law is used for detecting marsh gas in coal mines.

(A) Boyle's	(B) Grahams
(C) Charles law	(D) Rate law

Question-6
Temperature of a gas is measured by a ________.

(A) Barometer	(B) Thermometer
(C) Manometer	(D) Gyroscope

Question-7 Which of the following best explains why a hot air balloon rises?

(A) The heating of the air causes the pressure inside the balloon to increase.	(B)The temperature difference between the inside and outside air causes convection currents.
(C)Cooler air diffuses more slowly than the warmer air.	(D)Hot air has a lower density than cold air.

Question-8
At mountain tops, pressure of air is ____________ that at sea level.

(A) greater than	(B) lower than
(C) equal to	(D) constant

Question-9
The force of attraction between the molecules of gas is ___________ .

(A) negligible	(B) greater than that of liquids
(C) greater than that of solids	(D) none of these

Question-10
Ammonia diffuses faster than hydrochloric acid .why ?

(A) Lighter gases diffuse faster than heavier gases	(B) Lighter gases diffuse slower than heavier gases
(C) Ammonia is heavier than hydrochloric acid	(D) HCl travels faster than NH₃

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Std 9

Andhra Pradesh (English Medium)

Practice in Related Chapters
Chemical Bonding
Behaviour of Gases
Atomic Structure
Metallurgy
Rates of Reactions
Chemical Calculation
Energetics