Chemistry Class 9th

321: ____ introduced absolute temperature scale.

A) Lord Kelvin

B) Robert Hook

C) Robert Boyle

D) Both b and c

322 : _____ has definite volume but does not have definite shape

A) Solid

B) Liquid

C) Gas

D) Plasma

323: _____ are less mobile than gases?

A) Solid

B) Gases

C) Liquid

D) none

324: ______ has very strong intermolecular forces

A) Solid

B) Gases

C) Liquid

D) Plasma

325: _____ diffuses faster than O2 gas.

A) N2

B) C2

C) H2

D) CO2

326: ____ gases diffuses faster than heavier ones.

A) Lighter

B) Normal

C) Heavier

D) Both a and b

327: When a tyre is punctured air is _____?

A) Effuses out

B) Diffuses out

C) Both

D) none

328: P=

A) F/A

B) A/F

C) P/A

D) A/P

329: ____ can move from one place to another.

A) Liquid molecules

B) Solid molecules

C) Gas molecule

D) None

330: Gas density is expressed in gram per ______?

A) Cm3

B) dm3

C) mm

D) km3

331: liquids and solids densities are expressed in gram per _____?

A) dm3

B) mm

C) Cm3

D) km3

332: The density of water increases by _____?

A) Heating

B) Cooling

C) Vaporization

D) none

333: In boyle’s law V ∝

A) 1/d

B) 1/T

C) 1/P

D) 1/V

334: The Kelvin scale of temperature start from ______?

A) 0 k

B) 1 k

C) 2 k

D) 3 k

335: In Charles law Volume ∝

A) T

B) K

C) P

D) V

336: Body temperature is measured in _____ scales.

A) Kelvin

B) Fahrenheit

C) Centigrade

D) None

337: Normal body temperature is ______?

A) 98.6Fo

B) 97.7Fo

C) 96.6Fo

D) 99.6Fo

338: Compounds may have _____ forces.

A)Sstrong intermolecular forces

B) Weak intermolecular forces

C) Both

D) None

339: The process of changing of liquid phase is called _____?

A) Evaporation

B) Condensation

C) Vapor pressure

D) Atmospheric pressure

340: _____ possesses high kinetic energy.

A) Solid

 B) Liquid

C) Gas

D) Plasma