Sorting and Separation of Materials into Groups Worksheet-1

Sorting and Separation of Materials into Groups Worksheet-1

1. Which is the correct list of characteristics of metals?

(a) Shine brightly when polished; good conductors of electricity and heat; solid at room temperature; transparent

(b) Good conductors of electricity and heat; solid at room temperature; opaque, except in extremely thin films; do not shine at all when polished

(c) Bad conductors of electricity and heat; solid at room temperature; opaque, except in extremely thin films

(d) Shine brightly when polished; good conductors of electricity and heat; solid at room temperature; opaque except in extremely thin films.

2. Select the transparent substance from the following

(a) Wood           (b) Stone            (c) Mirror                   (d) Glass

3. It is actually a combination of evaporation and condensation. The process first involves heating in order to vaporize the liquid. The vapors of the liquid on cooling give pure liquid. This process is called 

(a) Chromatography                   (b) Sublimation

(c) Filtration                                  (d) Distillation

4. Which reason is incorrect for separating components of a mixture?

(a) To separate two or more different but useful components

(b) To remove undesirable and useless components

(c) To remove pure or harmless components

(d) To obtain pure sample of a substance

5. A machine which is used for harvesting, threshing as well as for separting the grains from straw is called

(a) Harvester    (b) Thresher     (c) Sieve             (d) Ladle

6. When no more salt can be dissolved in water at a particular temperature then the solution a that temperature is called

(a) Unsaturated

(b) Saturated

(c) Sometimes saturated sometimes unsaturated

(d) None of these

7. The substances like wood, bricks, etc. which do not allow any light to pass through them are

(a) Transparent objects              (b) Translucent objects

(c) Opaque objects                       (d) None of these

8. Differenced in size of components is a solid-solid mixture is the principle of 

(a) Hand-picking                          (b) Threshing

(c) Winnowing                              (d) Washing

9. Tea leaves are removed from the brew by

(a) Hand picking                          (b) Strainer

(c) Aquaguard filter                     (d) Thresher

10. A pure substance is one which

(a) Has a uniform texture throughout (homogeneous)

(b) Has a fixed boiling point or melting point

(c) Is made up of only one type of particles

(d) All of these.

Answer Key:

(1)–(d); (2)–(d); (3)–(d); (4)–(c); (5)–(a); (6)–(b); (7)–(c); (8)–(a); (9)–(b); (10)–(d)