4. Materials : Metals and Non-Metals (CBSE) Class 8 Science Exemplar Questions and Solutions

Class 8 Science Exemplar Chapter 4: Materials : Metals and Non-Metals | MCQ Test Questions, Short Answer Questions, and Long Answer Questions with Explanation

Chapter  4: Materials : Metals and Non-Metals

Choose the correct Answers :

1.Which of the following is not a metal?
(a)copper  (b)sulphur  (c)aluminium  (d)iron
2.The substance that will be flattened on beating with a hammer is
(a)crystal of iodine   (b)lump of sulphur   (c)piece of coal  (d)zinc granule
3.Boojho has learnt that non-metals on beating with a hammer are generally broken into pieces. Which of the following is a non-metal?
(a)iron nail  (b)aluminium wire   (c)copper plate       (d)piece of coal
4.Materials which can be drawn into wires are called ductile. Which of the following is not a ductile material?
(a)silver     (b)copper      (c)sulphur
(d)aluminium
5.Metals are generally hard. Which of the following metals is an  exception and can be cut with a knife?
(a)iron  (b)sodium  (c)gold        (d)magnesium

6.Metals are generally solid. Which of the following metals is in the liquid state at room temperature?
(a)mercury         (b)silver   (c)aluminium       (d)sodium

Ans:
7.Metals generally react with dilute acids to produce hydrogen gas.Which one of the following metals does not react with dilute hydrochloric acid?
(a)magnesium   
(b)aluminium  (c)iron   (d) copper

8. Which of the following reacts with cold water vigorously?
(a)carbon  (b)sodium  (c)magnesium   (d)sulphur
9.The metal which produces hydrogen gas on reaction with dilute hydrochloric acid as well as sodium hydroxide solution is
(a)copper  (b)iron  (c)aluminium     (d)sodium
10.Which of the following non-metals reacts and catches fire on exposure to air?

(a)phosphorus  
(b)nitrogen (c)sulphur      (d)hydrogen
11.Generally metallic oxides are basic and non-metallic oxides are acidic in nature. Solution of which of the following oxides in water will change the colour of blue litmus to red?
(a)sulphur dioxide       
(b)magnesium oxide (c)iron oxide   (d)copper oxide

12.Which of the following property is not responsible for copper to be used as electrical conduction wires?
(a)ductility   (b)colour   (c)  good conductor of electricity  (d)it is solid

V ERY SHORT ANSWER QUESTIONS
13. Name two soft metals which can be cut with a knife.
14. Which non-metal is essential for our life and all living beings inhale it during breathing?
15. Name two major non-metals which are present in fertilisers and enhance the growth of plants.
16. Which non-metal is used to disinfect water?
17. A purple coloured non-metal forms a brown solution in alcohol which is applied on wounds as an antiseptic. Name the non- metal.
18. Zinc sulphate forms a colourless solution in water. Will you observe any colour on adding copper turning in it?

19. Why are bells made of metals?
20. Which liquid metal is used for making thermometers?
21. Which of the following metals can displace the other two metals from their salt solutions?
           zinc, iron, copper

27. Match the substances in Column A with their applications given in Column B.
   Column A                  Column B
(Substance)            (Application)
(a) oxygen            (i) for making crackers
(b) copper            (ii) for disinfecting water
(c) sulphur           (iii) all living beings inhale during breathing
(d) iron                 (iv) for making electric wires
(e) chlorine          (v) for making rails .

28. Some of the following statements are incorrect. Find the incorrect statements and correct them.
(a) The property of metals by virtue of which they can be drawn into wires is called ductility.
(b) Metals are good conductor of electricity but poor conductor of heat.
(c) Articles made of metals produce ringing sound when struck hard.
(d) Oxides of non-metals and metals are acidic in nature.
(e) A less reactive metal replaces a more reactive metal from its salt solution in water.
29. Iron is more reactive than copper. Can you write an activity to show this?
30. Fill in the blanks to complete the following paragraph.
The name of the product formed in the reaction of sulphur and _____________ is sulphur dioxide gas. When sulphur dioxide is dissolved in_________________, sulphurous acid is formed. The sulphurous acid turns _____________ litmus paper to ____________. Generally oxides of __________ are acidic in nature.
After completing the paragraph write two questions which you can raise on the basis of this information.

---

Posted 3 months ago