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Q:

In the gamma decay of a nucleus

A) the mass number of the nucleus changes whereas its atomic number does not change B) the mass number of the nucleus does not change whereas its atomic number changes
C) both the mass number and the atomic number of the nucleus change D) neither the mass number nor the atomic number of the nucleus changes
 
Answer & Explanation Answer: D) neither the mass number nor the atomic number of the nucleus changes

Explanation:

The emission of gamma rays does not alter the number of protons or neutrons in the nucleus but instead has the effect of moving the nucleus from a higher to a lower energy state (unstable to stable)

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Filed Under: Physics
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Q:

A body in equilibrium _______.

A) can move with constant acceleration B) is always at rest
C) can move with constant velocity D) can move with variable acceleration
 
Answer & Explanation Answer: C) can move with constant velocity

Explanation:
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Q:

What causes the mottling of the dental enamel ?

A) High levels of chlorine in water B) High levels of nitrate in the water
C) High levels of fluorides in the water D) High levels of calcium in the water
 
Answer & Explanation Answer: C) High levels of fluorides in the water

Explanation:
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Filed Under: General Science

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Q:

First man to go into space was

A) Roald Amundsen B) Reynalt Mayor
C) Robert Peary D) Major Yuri Gagarin
 
Answer & Explanation Answer: D) Major Yuri Gagarin

Explanation:
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Q:

Ocimum tenuiflorum is the scientific name of ___________.

A) Neem B) Mango
C) Babul D) Tulsi
 
Answer & Explanation Answer: D) Tulsi

Explanation:
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Q:

Trypsin is present in which of the following?

A) Bile juice B) Gastric juice
C) Saliva D) Pancreatic juice
 
Answer & Explanation Answer: D) Pancreatic juice

Explanation:
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Q:

______ is a thyroid hormone which controls the balance of calcium in the body.

A) Calcitonin B) Thyroxine
C) Calmodulin D) all of these
 
Answer & Explanation Answer: A) Calcitonin

Explanation:

Calcitonin is 32-amino acid linear polypeptide hormone that is produced in humans primarily by the parafollicular cells of the thyroid, and in many other animals in the ultimopharyngeal body. It acts to reduce blood calcium, opposing the effects of parathyroid hormone.

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Filed Under: Biology
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Q:

Accumulation of which one of the following in the leads to cramp?

A) Lactic acid B) Ethanol
C) Pyruvic acid D) Glucose
 
Answer & Explanation Answer: A) Lactic acid

Explanation:

Muscle cramping is a common problem encountered by athletes and non athletes alike. Defined as painful involuntary skeletal muscle contractions, cramps may be categorized as either non exercise related or exercise related. Traditionally, such cramping was believed to arise from dehydration, electrolyte imbalances (including magnesium, potassium and sodium),accumulation of lactic acid, or low cellular energy levels.

 

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Filed Under: Biology
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