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Q:

Which of these relationships is true of an uncharged atom?

A) The atomic mass is equal to the atomic number. B) The number of electrons is equal to the number of neutrons.
C) The number of protons is equal to the number of electrons. D) The atomic mass is equal to the number of electrons.
 
Answer & Explanation Answer: C) The number of protons is equal to the number of electrons.

Explanation:

The number of protons is equal to the number of electrons. That is the number of positive charges is equal to the number of negative charges.

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Filed Under: Chemistry
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Q:

What provides electrons for the light reactions?

A) Water B) Oxygen
C) Carbon dioxide D) Light
 
Answer & Explanation Answer: A) Water

Explanation:

Electrons are stripped from water in the light reactions of photosynthesis. Light provides the energy to excite electrons.

 

ATP and NADPH are both products of the light reactions and are used to power the Calvin cycle.

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Q:

The pressure exerted by a 760 mm column of mercury at 0°C  is known as

A) 1 pascal B) 1 atmosphere
C) 1 bar D) 1 poise
 
Answer & Explanation Answer: B) 1 atmosphere

Explanation:

1 atm: It was originally defined as the pressure exerted by 760 mm of mercury at 0 °C and standard gravity (g = 9.80665 m/s2).

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Filed Under: Physics
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Q:

Lightning is produced when 

A) Similar charges of electricity rush towards each other and then get repelled B) clouds strike against impurities in air and the friction burns up these impurities
C) strong opposite charges in different clouds break down the resistance offered by the intervening air D) water vapour produces electricity in the clouds
 
Answer & Explanation Answer: C) strong opposite charges in different clouds break down the resistance offered by the intervening air

Explanation:

When the resistance of the air between breaks down the current flows from the positive cloud to the negative cloud in a flash which we call lightning . The difference of potential involves is very high.

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Q:

A song always has

A) Musician B) Tymbal
C) Word D) Chorus
 
Answer & Explanation Answer: C) Word

Explanation:

Without a word in it, it can't be called as song.

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Q:

Cerebro spinal fluid protects

A) Heart B) Brain
C) Liver D) Kidney
 
Answer & Explanation Answer: B) Brain

Explanation:
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Filed Under: Biology

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Q:

Chemical Co- ordination in the body is brought out by

A) Blood B) Lymph
C) Enzymes D) Hormones
 
Answer & Explanation Answer: D) Hormones

Explanation:
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Q:

Which of the following statements best describes nutrient density?

A) Consume a variety of foods from MyPyramid's ±ve major food groups every day. B) Consume foods that have the most nutrition for their kcalories
C) Choose a number of diFerent foods within any given food group rather than the same old thing. D) All the above
 
Answer & Explanation Answer: B) Consume foods that have the most nutrition for their kcalories

Explanation:

Consume foods that have the most nutrition for their kcalories describes the Nutrient Density.

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