Assertion and reasoning
The question below consists of statement of an Assertion and a reason. Ise the
choose appropriate answer.
(A) If both assertion and reason are correct and reason is the correct explanation of as
(B) If both assertion and reason are correct but reason is not the correct explanation o
(C) If assertion is correct but reason is incorrect.
(D) Is assertion is incorrect but reason is correct.
Q16. Assertion - Metals are electropositive.
Reason - Metals lose electron.
Q17. Assertion - Some viruses are called bacteriophages.
Reason - Bacteriophages are like bacteria.
Q18. Assertion - Rayon is very smooth and soft synthetic fibre.
Reason - Rayon is made up of wood pulp which is a natural material.
Q19. Assertion - Sound can travel in vacuum.
Reason - Sound need medium to travel.
Q20. Assertion - Lubricants Reduces the friction.
Reason
By applying lubricants we can increase the interlocking between two
Answers
Explanation:
16. A
An electropositive element is one that has tendency to lose electrons and form positively charged ion. Metals like Na, Mg, K, Ca, Fe, Zn lose electrons and form positively charged ion. Due to this metals are called electropositive elements.
17. C
A bacteriophage is a type of virus that infects bacteria.In fact, the word "bacteriophage" literally means "bacteria eater,"
18. A
Rayon is produced by dissolving cellulose(wood pulp) followed by the conversion of this solution back to insoluble fibrous cellulose.
19. D
Sound needs a material medium for their propagation like solid, liquid or gas to travel because the molecules of solid, liquid and gases carry sound waves from one point to another. Sound cannot progress through the vacuum because the vacuum has no molecules which can vibrate and carry the sound waves.
20.A
A lubricant is a substance, usually introduced to reduce friction between surfaces in mutual contact, which ultimately reduces the heat/ friction generated when the surfaces move.
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