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Q:

Species containing same number of electrons are called

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

Explanation:
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Filed Under: Chemistry

Q:

A man in a train notices that he can count 41 telephone posts in one minute. If they are known to be 50 metres apart, then at what speed is the train travelling?

A) 60 km/hr B) 100 km/hr
C) 110 km/hr D) 120 km/hr
 
Answer & Explanation Answer: D) 120 km/hr

Explanation:

Number of gaps between 41 poles = 40
So total distance between 41 poles = 40*50
= 2000 meter = 2 km
In 1 minute train is moving 2 km/minute.
Speed in hour = 2*60 = 120 km/hour

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Filed Under: Time and Distance
Exam Prep: GRE

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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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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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