Which of the following one is hard and does not rust ?
A) iron
B) copper
C) stainless steel
D) none of these
1 Answers
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Which one of the following does not come under modem farming methods
B) Use of person wheel for irrigation
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Which one of the following does not ensure food security to the people ?
C) Extremely inadequate purchasing power
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The chemical name of rust ……………..
B) Hydrated ferric oxide
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The formula of rust is……………..
C) Fe2O3 . XH2O.
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The chemical formula of rust is
Correct option is A) Fe2O3 .XH2O
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In which one amongthe following cases the convex lens does not give a real image?
A) When the object is placed between the focal point and optic centre
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Which one of the following seeds does not have endosperm ?
(D) Red gram
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Push a heavy box with a small force. It does not move. Now gradually increase the force, the box till does not move.
A) force increases, friction increases
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Iron powder and powder of rust are taken in two containers X and Y respectively. Dilute sulphuric acid is added two containers
Correct Answer - B Iron is an element and rust is a compound of iron in which iron does not retain its properties and hence rust does not liberate hydrogen gas...
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Which of the following substances does not form a curdy precipitate when it is added to hard water ?
Correct Answer - C Sodium lauryl sulphate does not form a curdy precipitate in hard water.
2 Answers 1 views