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Q:

The atoms of the elements having same mass number but different atomic number are called

A) Isotopes B) Isobars
C) Isotones D) Isomers
 
Answer & Explanation Answer: B) Isobars

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Filed Under: Chemistry

Q:

The distance from town A to town B is five miles. C is six miles from B. Which of the following could be the maximum distance from A to C? 

A) 11 B) 8
C) 2 D) 4
 
Answer & Explanation Answer: A) 11

Explanation:

Do not assume that AB and C are on a straight line. Make a diagram with A and B marked 5 miles apart. Draw a circle centered on B, with radius 6. C could be anywhere on this circle. The minimum distance will be 1, and maximum 11

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Filed Under: Time and Distance
Exam Prep: GRE

Q:

Which one is not the isotopes of hydrogen

A) Protium B) Deuter
C) Tritium D) All
 
Answer & Explanation Answer: C) Tritium

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Filed Under: Chemistry

Q:

In isotopes the number of neutrons are

A) same B) different
C) both D) none
 
Answer & Explanation Answer: B) different

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Filed Under: Chemistry

Q:

Which one of the following elements is essential for construction is nuclear reactors

A) Cobalt B) Nickel
C) Zirconium D) Tungsten
 
Answer & Explanation Answer: C) Zirconium

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Filed Under: Chemistry

Q:

Which one of the following is not radioactive

A) Astanine B) Francium
C) Tritium D) Zirconium
 
Answer & Explanation Answer: D) Zirconium

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Filed Under: Chemistry

Q:

A radioactive substance has a half life of four months, three-fourth of the substance would decay in

A) 3 months B) 4 months
C) 8 months D) 12 months
 
Answer & Explanation Answer: C) 8 months

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Filed Under: Chemistry

Q:

Cobalt - 60 is commonly used in radiation therapy because it emits

A) alpha - rays B) beta rays
C) gamma rays D) X - rays
 
Answer & Explanation Answer: C) gamma rays

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Filed Under: Chemistry