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CLASS - 10 SCIENCE IMPORTANT QUESTIONS OF MARK 1

QUESTION NO. 41

What is variable resistance.

ANSWER NO. 41

It is a component used to regulate current without changing the voltage source is called variable resistance.

QUESTION NO. 42

What is rheostat why it is used in circuit ?

ANSWER NO. 42

In an electric circuit, a device called rheostat is after used to charge the resistance in the circuit.

QUESTION NO. 43 

What will be the reading of ammeter when wire length of wire is doubled.
(a)  Double 
(b)  One half 
(c)   No change 
(d)  Three times 

ANSWER NO. 43

(b) One half

QUESTION NO. 44

Why magnesium ribbon be cleaned before burning in air.

ANSWER NO. 44

Magnesium form a layer of magnesium oxide when expose to air. This layer prevented to reaction that why it is cleaned before burning.

QUESTION NO. 45

Why silver chloride turn in grey in sunlight.

ANSWER NO. 45
Due to decomposition of silver chloride into silver and chlorine by light.

QUESTION NO. 46

Define double displacement reaction with example.

ANSWER NO. 46

Such reactions in which there is an exchange of ions between the reactants are called double displacement reactions.

QUESTION NO. 47

What is skeletal equation.

ANSWER NO. 47

The unbalanced chemical equation is called skeletal equation.

QUESTION NO. 48

Write the name of substances which is used in photography.

ANSWER NO. 48

AgBr  is used in photography.

QUESTION NO. 49

Nitrogen is flushed in oil containing food items packets. Nitrogen acts as -
(a)  Reducing Agent 
(b)  Anti oxidants
(c)  Oxidation 
(d)  Dehydrating agent

ANSWER NO. 49

(b) Anti oxidants

QUESTION NO. 50

Which allotrope of carbon is the form of soccer ball .
(a)  Graphite
(b)  Diamond
(c)  Fullerene
(d)  None of the these
   
ANSWER NO. 50

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