Gas Laws and Staticelectricity Woeksheet class 9

                                                           Gas laws

1.  Moist nitrogen at a pressure of 700 mm Hg and temperature 27^oC is found to occupy a volume of 100 cm³. Find the volume of dry nitrogen gas at S.T.P.
(Aqueous tension at 27^oC is 15 mm Hg)

2.   A given mass of a gas occupies 960 ml at 27^oC. What volume will it occupy if the temperature is raised to 177^oC, pressure remaining constant.

3.  A gas occupies 200 cm³ at a temperature of 27^oC and 720 mm of Hg. Find its volume at 3^oC and 740 mm of Hg.

4. What is the pressure-volume relationship of a gas when temperature remains constant?

5. The volume occupied by a certain gas was found to be 5.6 dm³ at 2 atmospheric pressure. If the pressure is increased by 20%, find the new volume of the gas.

                                           

                                                 Static electricity

Question 1

During a thunderstorm the safest place in open is under the trees 

True

False

Question 2

When an ebonite rod is rubbed with a fur, the charge acquired by the rod is positive and by fur is negative.

False

True

 Question 3

The metal foil on the glass bottle of an electroscope is earthed when the electroscope is in use, in order to protect it from any external damage.

False

True

Question 4

The negative charge on a body is due to gain of electrons while the positive charge on the body is due to gain of protons.

False

True

Question 5

Sparking is caused due to flow of electrons through the air between the two non touching charged bodies when kept closer to each other. 

False

True

Question 6

The charge on an unevenly shaped body is uniformly distributed. 

True

False