Q:

The commonly used coolant in refrigerators is

A) Ammonia	B) Nitrogen
C) Freon	D) Oxygen

Answer & Explanation Answer: C) Freon

Explanation:

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Q:

Stoichiometry is based on

A) Law of conservation of energy	B) Law of conservation of mass
C) Newton's 1st law	D) Kepler's law

Answer & Explanation Answer: B) Law of conservation of mass

Explanation:

Stoichiometry is a branch of chemistry deals with the calculations on reactants and products. It is based on the Law of conservation of mass where total mass of reactants is equal to total mass of products.

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Q:

Which of these best describes genetic drift?

A) Random fluctuations in the gene frequencies within a population Eliminate	B) The combining of alleles to create more genetic variations within a population
C) The movement of alleles between population	D) A planned method to reduce the number of inferior genes in a population

Answer & Explanation Answer: A) Random fluctuations in the gene frequencies within a population Eliminate

Explanation:

Random fluctuations in the gene frequencies within a population Eliminate is the one which best describes genetic drift.

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Q:

Which statement correctly describes the role of chance in evolution?

A) An allele that increases evolutionary fitness cannot be lost from a population by chance events.	B) The ultimate source of new alleles is mutation, random changes in the nucleotide sequences of an organism's DNA
C) Evolutionary change proceeds by an accumulation of changes that occur by chance.	D) None of the above

Answer & Explanation Answer: B) The ultimate source of new alleles is mutation, random changes in the nucleotide sequences of an organism's DNA

Explanation:

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Q:

What property of matter is momentum related to?

A) mass	B) velocity
C) Both A & B	D) None of the above

Answer & Explanation Answer: C) Both A & B

Explanation:

At any given speed, momentum is directly proportional to mass of an object.

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Q:

What factors contribute to global winds?

A) Coriolis Effect	B) Convection Cells
C) Uneven warming of the earth by the sun	D) All of the above

Answer & Explanation Answer: D) All of the above

Explanation:

All of the factors that contribute to global winds are

1) Uneven warming of the earth by the sun
2) Coriolis Effect
3) Convection Cells

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Q:

Graphite is a good conductor of electricity.

A) TRUE

B) FALSE

Answer & Explanation Answer: A) TRUE

Explanation:

Graphite is a good conductor of electricity as it contains free electrons to move through the structure of the graphite.

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Q:

Improve the bracketed part of the sentence.
If (you will approach) her sincerely, she will listen to your problem definitely.

A) you approach	B) you are approaching
C) you will be approaching	D) No improvement

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