Previous year MCQs

General science UPPSC 2009 GS-I
Question

The atoms, in which the number of protons is same but the number of neutrons is different, are known as:

Answer & Solution

Answer: (Detailed Solution Below)

Option A: Isotopes

Detailed Solution:

The correct answer is “Isotopes”.
Atoms with the same number of protons but different numbers of neutrons are called isotopes.

The number of protons in an atom's nucleus is its atomic number, which determines the element's position on the periodic table. Isotopes have the same atomic number and position on the periodic table, but different mass numbers because of their different numbers of neutrons.

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Match list-I with list-II and select the correct answer using the code given below:
List-I - List-I

A. Malaria - 1. Bone Marrow
B. Filaria - 2. Brain
C. Encephalitis - 3. Muscle
D. Leukemia - 4. Lymph node
5. Blood cells

Code:
A B C D
  1. A) 5 3 2 1
  2. B) 5 4 2 1
  3. C) 4 3 5 1
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