set 2 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 3 EXERCISES
The following question based on atomic structure, molecules and nuclear chemistry topic of general science mcq
Assertion (A) :
Atomic weights of most of the elements are not whole numbers.
Reason (R) :
Atoms of most of the elements contain mixture of isotopes having different atomic weights.
(a) A is true but R is false
(b) Both A and R are individually true but R is NOT the correct explanation of A
(c) Both A and R are individually true and R is the correct explanation of A
(d) A is false but R is true
The correct answers to the above question in:
Answer: (c)
Discuss Form
Read more chemistry basic Based General Science Questions and Answers
Question : 1
Which would be the electrical charge on a sulphur atom containing 18 electrons ?
a) 1–
b) 0
c) 2–
d) 2+
Answer »Answer: (c)
S(16) = 2, 8, 6
Hence S(18) need two or more electron to complete its octet.
i.e S + 2e– ⟶ S– –
Question : 2
The atomic weights are expressed in terms of atomic mass unit. Which one of the following is used as a standard?
a) 12C6
b) 16O8
c) 1H1
d) 35Cl17
Answer »Answer: (a)
12C6 used as a standard in the expression of atomic weights in term of amu.
Question : 3
Which of the following pairs are isotopes?
a) Ice and steam
b) Nitric oxide and nitrogen dioxide
c) Oxygen and ozone
d) Hydrogen and deuterium
Answer »Answer: (d)
Question : 4
The nucleus of a singly ionized carbon atom contains
a) 6 protons, 6 neutrons and 6 electrons
b) 5 protons and 6 neutrons
c) 6 protons and 6 neutrons
d) 12 protons, 6 neutrons and 6 electrons
Answer »Answer: (c)
Question : 5
Molecular mass is defined as the
a) mass of one atom compared with the mass of one atom of hydrogen
b) mass of one molecule of any substance compared with the mass of one atom of C-12
c) mass of one atom compared with the mass of one molecule
d) None of these
Answer »Answer: (b)
Question : 6
Which of the following are the constituents of matter?
- Atoms
- Molecules
- Solid
a) B and C only
b) A and C only
c) A and B only
d) A, B and C
Answer »Answer: (c)
Verbal Reasoning
Question & Answer Quiz
Non Verbal Reasoning
Question & Answer Quiz
Quantitative Aptitude
Question & Answer Quiz
Computer MCQ
Question & Answer Quiz
General English
Question & Answer Quiz
History GK
Question & Answer Quiz
Polity GK
Question & Answer Quiz
Geography GK
Question & Answer Quiz
Economy GK
Question & Answer Quiz
General Awareness GK
Question & Answer Quiz
Recently Added Subject & Categories For All Competitive Exams
Most Important Antonyms Vocabulary - IBPS Clerk Prelims 2024
Latest Antonyms multiple choice questions and answers with free PDFfor IBPS Clerk Prelims 2024. English Vocabulary practice exercise for all bank exam
Continue Reading »
Syllogism Practice Questions Answers PDF - IBPS Clerk 2024
Practice Verbal Reasoning Syllogism multiple choice questions and answers with Fully solved explanation, PDF for the IBPS Clerk Prelims 2024 Bank Exam
Continue Reading »
IBPS Clerk Prelims 2024 Synonyms Questions Solved Answers
Most important IBPS Clerk Prelims 2024 Synonyms and Antonyms multiple choice questions and answers with detailed solutions, English vocabulary PDF Download
Continue Reading »
New Cloze Test Questions and Answers PDF - IBPS Clerk 2024
The most important Cloze Test questions with detailed answers for upcoming IBPS Clerk prelims 2024. Latest English verbal ability practice MCQs, PDF
Continue Reading »