| 1 |
A deficiency of this mineral can cause stretch marks in our skin; this mineral is
|
Zinc <br>
Iron<br>
Sodium<br>
Magnesium <br>
|
| 2 |
Air is a/an
|
Element <br>
compound <br>
Mixture<br>
Colloid <br>
|
| 3 |
Alcohol contains
|
Nitrogen, hydrogen, oxygen<br>
Carbon, hydrogen, oxygen<br>
Oxygen, carbon, nitrogen<br>
hydrogen , chlorine, oxygen<br>
|
| 4 |
All noble gases are
|
colourless<br>
odourless <br>
colourless and odourless <br>
light blue<br>
|
| 5 |
All the following are examples of chemical change, expect
|
magnetising of iron nail<br>
Rusting of iron rod <br>
Digestion of food<br>
Souring of milk<br>
|
| 6 |
All pottery ware made form common clay and which are not covered with glaze is called
|
terracotta <br>
cermets <br>
enamels <br>
fire bricks<br>
|
| 7 |
Alloy steel containing chromium to resit rusting is known as
|
Wrought iron<br>
Cast iron<br>
Hard steel<br>
Stainless steel <br>
|
| 8 |
Alloys in which mercury is non of the metals are called
|
Amalgams<br>
Emulsions<br>
Mixtures<br>
Solders<br>
|
| 9 |
An element found in all organic compound is
|
nitrogen<br>
carbon<br>
calcium<br>
None of them<br>
|
| 10 |
Atomic number of an element gives
|
the number of the electron is in its atom<br>
the number of nucleons in it s atom<br>
the weight of the atom of the element<br>
the total number of elementary particles<br>
|
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