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Q:

If cotA + cotB = x, then value of x is

A) (cotAcotB + 1)/(cotB - cotA) B) (cotAcotB + 1)/(cotB + cotA)
C) (cotAcotB - 1)/(cotB + cotA) D) (cotAcotB - 1)/(cotB - cotA)
 
Answer & Explanation Answer: C) (cotAcotB - 1)/(cotB + cotA)

Explanation:
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Q:

Which of the following is an example of chemical weathering?

A) Oxidation B) Acid rains
C) Carbonation D) All the above
 
Answer & Explanation Answer: D) All the above

Explanation:

Chemical weathering is what happens when rocks are broken down and chemically altered.

Chemical weathering is the breakdown of rocks by chemical reactions. Chemical weathering involves changes in the chemical composition of the existing rock to form new rock. Some examples of chemical weathering are hydrolysis, oxidation, carbonation, dissolution, etc.

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Filed Under: Chemistry
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Q:

Galvanised iron sheets have a coating of

A) Aluminium B) Copper
C) Zinc D) None of the above
 
Answer & Explanation Answer: C) Zinc

Explanation:

Galvanised iron sheets have a coating of zinc.

Galvanised_iron_sheets_have_a_coating_of1552913417.jpg image 

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Q:

If in a two digit number, the digit at unit place is z and the digit at tens place is 8, then the number is

A) 80z + z B) 80 + z
C) 8z + 8 D) 80z + 8
 
Answer & Explanation Answer: B) 80 + z

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Q:

What is the value of cosec 11π/6?

A) -2/√3 B) √2
C) -2 D) -√2
 
Answer & Explanation Answer: C) -2

Explanation:
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Q:

Are Alternate Exterior Angles congruent?

A) TRUE B) FALSE
Answer & Explanation Answer: A) TRUE

Explanation:

We know that,


Alternate Exterior Angles Theorem::


The Alternate Exterior Angles Theorem states that, when two parallel lines are cut by a transversal, the resulting alternate exterior angles are congruent .



Converse of the Alternate Exterior Angles Theorem ::


Converse of the Alternate Exterior Angles Theorem states that, If two lines are cut by a transversal and the alternate exterior angles are congruent, then the lines are parallel.

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Subject: Arithmetical Reasoning
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Q:

Biogeochemical cycles are crucial to ecosystem function because

A) they keep the planet warm enough for living things to survive B) energy flows through ecosystems in one direction only and is eventually dissipated as heat
C) they prevent catastrophic extinctions D) nutrients and other life-sustaining molecules are in limited supply and must be continually recycled
 
Answer & Explanation Answer: D) nutrients and other life-sustaining molecules are in limited supply and must be continually recycled

Explanation:

Biogeochemical cycles are crucial to ecosystem function because ::

 

1. Chemical elements are available in only limited amounts and must be recycled.

2. Nutrients and other life-sustaining molecules are in limited supply and must be continually recycled.

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Q:

Bleaching powder is used in drinking water as

A) Disinfectant B) Antibiotic
C) Coagulant D) Antiseptic
 
Answer & Explanation Answer: A) Disinfectant

Explanation:
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