Online Test of Chapter 2 Is Matter Around us Pure 2 Science| Class 9th

Questions :

1. An example of a liquid metal and a liquid non-metal is
(a) gallium, mercury
(b) mercury, chlorine
(c) mercury, bromine
(d) bromine, sulphur

2. Which out of the following is a heterogeneous mixture?
(a) air
(b) brass
(c) iodised table salt
(d) steel

3. Brass is an example of a
(a) homogeneous compound
(b) homogeneous mixture
(c) heterogeneous mixture
(d) heterogeneous compound

4. The cause of Brownian movement is
(a) impact of molecules of dispersion medium on colloidal particles.
(b) attractive forces between the particles of dispersed place and dispersion medium
(c) heat changes in liquid state.
(d) convection currents.

5. Air is regarded as a mixture because
(a) its pressure may vary
(b) its temperature may change
(c) its volume changes under different conditions
(d) its composition may vary

6. When solutions of sodium sulphate and barium chloride are mixed, an insoluble solid settles at the bottom of the test tube. Its colour is
(a) blue
(b) green
(c) white
(d) yellow

7. Which of the following is not a compound?
(a) Sulphur dioxide
(b) Chalk
(c) Lead
(d) Sulphuric acid

8. The Brownian movement in colloids is due to:
(a) Tyndall effect
(b) Charge on colloidal solution
(c) Collisions between colloidal particles and with dispersion medium
(d) All of these

9. Which of the following is a compound?
(a) Stainless steel
(b) Bronze
(c) Graphite
(d) Hydrogen sulphide

10. Which of the following statements is true about compounds?
(a) Compound is homogeneous and have fixed composition
(b) Compound is heterogeneous and have fixed composition
(c) Compound is heterogeneous
(d) Compound is heterogeneous and has no fixed composition.

11. Which of the following is not a mixture?
(a) Pure water
(b) Sea water
(c) Air
(d) Brass