Available Answers

1. 1.

   Fill in the blanks by choosing the correct option.

   1. ___________ (Gases/Liquids) are highly compressible and can flow in any direction.
   2. In ____________ (water/water vapour), the particles are loosely packed due to extremely weak inter-particle force of attraction.
   3. ___________ (Solids/Liquids) have very strong inter-particle force of attraction and very little inter-particle space.
   4. ____________ (Milk/A pencil) will take the shape of the container because it is ______________ (solid/liquid) in state.
   5. The Brownian motion of particles in ___________ (ice/water) is faster than that of the particles in __________ (ice/water).
2. 2.

   Name the following.

   1. It is composed of very small particles called atoms. It has mass and occupies space.
   2. They may or may not exist independently, but combine to form a molecule.
   3. A state of matter that can flow in any direction.
   4. The erratic movement of microscopic particles in a fluid, as a result of continuous bombardment from particles of the surrounding medium.
   5. A state of matter with definite shape and definite volume.
3. 3.

   Choose the correct option.

   1. The shape of which of the following can be changed only by applying external force?
      1. Wood
      2. Steam
      3. Water
      4. Carbon dioxide
   2. The proportion of elements in a compound
      1. varies widely
      2. varies from source to source
      3. varies only a little
      4. does not vary
   3. Inter-particle force of attraction between the particles of same type is also known as
      1. Active force
      2. Cohesive force
      3. Internal force
      4. External force
   4. The inter-particle space is maximum in
      1. Wood
      2. Water
      3. Milk
      4. Oxygen
   5. Which of the following is least compressible?
      1. Liquid
      2. Gas
      3. Solid
      4. Hydrogen
4. 4.

   Match the columns.

   Column A	Column B
   1. Compound	a. Smallest unit of a compound
   2. Water	b. Minimum inter-particle space
   3. Solid	c. Random movement
   4. Brownian motion.	d. Constituents cannot be separated physically
   5. Molecules.	e. Takes the shape of the container

    

5. 5.

   Write T for True and F for False. Correct the false statements (s).

   1. Apart from solid, liquid and gas, there are two more states of matter - Plasma and Einstein.
   2. Air, carbon dioxide, water and steam are fluids.
   3. Most gases can be seen with our naked eyes.
   4. A molecule is the smallest unit of matter.
   5. Eight suphur atoms join to form a sulphur molecule.
6. 6.

   Fill in the blanks.

   1. The quantity of matter that a body contains is called its ______________ (mass/weight)
   2. The __________ (mass/weight) of matter remains same, whereas __________ the (mass/weight) varies with the gravity.
   3. The elements like helium, neon and argon have the ability to exist as single __________ (atom/molecule).
   4. A ______________ (pure/mixed) substance has fixed chemical properties and well defined physical properties.
   5. A pure substance can be either an _____________ (element/atom) or a compound.