9th Class General Science Chapter 7 Test07. States of Matter

Q1. Multiple choice questions (Attempt all · 9 × 1 = 9)

1. One litre of water is cooled from 4°C to 0C, its volume:
   1. decreases then increases
   2. remains same
   3. increases
   4. decreases
2. Glue is an example of _______ solid:
   1. crystalline
   2. amorphous
   3. liquid-solid
   4. ductile
3. What type of intermolecular forces holds liquid N₂ together?
   1. ionic bond
   2. London dispersion force
   3. hydrogen bond
   4. dipole-dipole force
4. The process which involves the transformation between gas and solid is:
   1. melting
   2. freezing
   3. evaporation
   4. sublimation
5. Which of the following is an amorphous allotrope of carbon?
   1. diamond
   2. bucky ball
   3. graphite
   4. lampblack
6. Which of the following is not the characteristic of a solid?
   1. high rigidity
   2. regular shape
   3. high density
   4. high compressibility
7. The best conductor of heat among following liquids is:
   1. water
   2. ether
   3. alcohol
   4. mercury
8. The formation of clouds in the sky is due to the process of:
   1. melting
   2. sublimation
   3. condensation
   4. boiling
9. Wood charcoal is an allotrope of:
   1. silicon
   2. carbon
   3. nitrogen
   4. mercury