Q:

All isotopes of the same element have ____________

A) different atomic numbers and different atomic mass	B) different atomic numbers and the same atomic mass
C) the same atomic number but different atomic masses	D) the same atomic number and the atomic mass

Answer & Explanation Answer: C) the same atomic number but different atomic masses

Explanation:

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Filed Under: Chemistry

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Q:

The unit of power used in industry is

A) Joule	B) Watts
C) Horse power	D) Kilowatts

Answer & Explanation Answer: C) Horse power

Explanation:

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Q:

The acceleration due to gravity at the surface of the earth (mass M and radius R) is proportional to ___.

A) MR	B) M/R2
C) M2/R	D) M/R

Answer & Explanation Answer: B) M/R2

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Q:

If Metal A displaces Metal B from its solution, then Metal A ____.

A) is more reactive than B	B) is less reactive than B
C) is heavier than B	D) has the same reactivity as B

Answer & Explanation Answer: A) is more reactive than B

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Q:

Which of the following is not correct with reference to Bio-sand Water Filter?

A) It deactivates or kills pathogens	B) Sedimentation removes larger particles
C) Filtration removes smaller particles	D) High quality water is always assured

Answer & Explanation Answer: D) High quality water is always assured

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Q:

What temperature does bacteria grow quickest at

A) 40°F and 140°F	B) 14°C and 90°C
C) 80°F and 140°F	D) None

Answer & Explanation Answer: A) 40°F and 140°F

Explanation:

Most bacteria will grow rapidly between 4°C and 60°C (40°F and 140°F).

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Filed Under: Biology
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Q:

Which of the following is at the second trophic level of a food chain?

A) Grass	B) Rats
C) Snake	D) Eagle

Answer & Explanation Answer: B) Rats

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Filed Under: Biology
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Q:

Who wrote the book "Gone with the Wind"?

A) Jane Austen	B) William Blake
C) Charles Dickens	D) Margaret Mitchell

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