What is the pH value of acid rain?

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RRB NTPC Exam 27 Jan 2021 click here to view all questions

What is the pH value of acid rain?

ALess than 5.6

BMore than 5.6

CEqual to 7.0

DMore than 7.0

Akhilesh ? Apr 1 '25 at 20:38

correct answer is: option a : Less than 5.6
Explanation: Acid rain is defined as any precipitation with a pH less than 5.6. Normal rain is slightly acidic (around pH 5.6) due to the presence of atmospheric carbon dioxide, which dissolves to form weak carbonic acid. Acid rain is more acidic than this due to the presence of pollutants like sulfur dioxide and nitrogen oxides, which form stronger acids like sulfuric acid and nitric acid.

• Option a: Correct. Acid rain is defined as having a pH value less than 5.6.
• Option b: Incorrect. A pH greater than 5.6 indicates less acidity, not acid rain.
• Option c: Incorrect. A pH of 7.0 is neutral, and acid rain is acidic.
• Option d: Incorrect. A pH greater than 7.0 is basic/alkaline, not acidic.

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Which of the following is called Aurum?

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RRB Non Technical Exam (Secunderabad) 2016 click here to view all questions

Which of the following is called Aurum?

ABronze

BGold

CSilver

DCopper

rihad ? Jan 10 '2020 at 14:10

Correct answer is: Gold

Explanation:

• Latin name for Gold is called Arum.
• Latin name for sliver is Argentum.
• Latin name for Copper is Cuprum.
• There is no Latin name for Bronze as its mixture of Copper and Tin (stannum).

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Which gas is evolved during photosynthesis in plants?

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RRB ASSISTANT LOCO PILOT (Allahabad) 2010 click here to view all questions

Which gas is evolved during photosynthesis in plants?

ACarbon dioxide

BOxygen

CNitrogen

DHidrogen

rahul ? Jan 11 '2020 at 18:53

Correct answer is: Oxygen

Explanation:

The chemical equation for photosynthesis is:

$6CO_2{(g)}+6H_2O{(l)}\overset{\text{sunlight}}{\xrightarrow{\text{chlorophyll}}}C_6H_{12}O_6{(aq)}+6CO_2{(g)}$

So from here, we see that carbon dioxide and water are used, in the presence of light and chlorophyll, so that eliminates options B) and C).

A) is a correct answer because oxygen gas is present on the reactants side of the equation.

But wait, there's more! Glucose is eventually converted into pyruvic acid, and then adenosine triphosphate (ATP), which is the main energy carrier in all cells, so technically

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Genetics Is related to the study of

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RRB Junior Clerk Exam (Allahabad) 2009 click here to view all questions

Genetics Is related to the study of

Aheredity

Bchromosomes

CsleepIng sickness

Dmuscles

Nithin K ? Apr 22 '2018 at 18:44

Correct Answer: A [heredity]

Explanation:

Genetics is the study of genes, genetic variation, andheredity in living organisms. It is generally considered a field of biology, but intersects frequently with many other life sciences and is strongly linked with the study of information systems.

Reference: https://en.wikipedia.org/wiki/Genetics

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