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CLASS - 10 SCIENCE IMPORTANT QUESTIONS OF MARK 1


QUESTION NO. 71

What is PVC. Why electric wires coated with such substances.

 ANSWER NO. 71

 PVC (Polyvinylchloride ) is a rubber like material which is bad conductor of electricity that's why electric wires are coated with PVC.

 QUESTION NO. 72

 What is Sonorous ?

 ANSWER NO . 72

 The metals that produce a sound on striking a hand surface are said to be sonorous.

 QUESTION NO. 73

 Write the name of non metal which is in liquid form.

 ANSWER NO. 73

 Bromine

 QUESTION NO. 74

 Write the name of metal which exist in liquid form.

 ANSWER NO. 74

 Mercury

 QUESTION NO. 75

 Write the name of metals which have very low melting point. The can melt even keeping on palm.

 ANSWER NO. 75

 Gallium and Caesium.

 QUESTION NO. 76

 Write the two allotrope of Carbon.

 ANSWER NO. 76

 (a) Diamond 
(b) Graphite

 QUESTION NO. 77

 Write the name of metals which can be cut by knife.

 ANSWER NO. 77

 Lithium, Sodium and Potassium these are Alkali metals.

 QUESTION NO. 78

 Write the name of metal which will catch fire if kept in open.

 ANSWER NO. 78

 Sodium and Potassium hence to protect them and to prevent accidental fires they are kept immersed in Kerosene oil.

 QUESTION NO. 79

 What is ore ?

 ANSWER NO. 79

 Minerals contain a very high percentage particular metal and the metal can be profitably extracted from it. These minerals are called ores.

 QUESTION NO. 80

 Write the name of metals which are never found in free state.

 ANSWER NO. 80

 K, Na, Ca, Mg and Al.

 ALSO SEE IMPORTANT QUESTION OF 1 MARK

 From question no. 31 to 40

From question no. 1 to 10

From question no. 21 to 30

From question no. 41 to 50

From question no. 51 to 60

From question no. 61 to 70

From question no. 71 to 80

From question no. 81 to 90

From question no. 101 to 110

From question no. 111 to 120

From question no. 121 to 130

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