Science MCQ Chapter 4 Class 9 Parameters of An Atom

MCQ’s For All Chapters – Science Class 9th

1. There will be total 20 MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying

1. Which of the following element is used in the treatment of cancer?

Uranium

Cobalt

Nickel

Iodine

Question 1 of 24

2. ²₁H and ³₁H are _______ .

isotopes

isobars

isotones

isochores

Question 2 of 24

3. Which one of the following statements is correct about isotopes?

Each isotope of an element is a pure substance.

The chemical properties of isotopes are similar.

The physical properties of isotopes are different.

All of above.

Question 3 of 24

4. The two isotopes of chlorine are ³⁵₁₇Cl and ³⁵₁₇Cl in the ratio of 3:1. What is the average atomic mass of the chlorine atom?

72 u

37 u

35.5 u

35 u

Question 4 of 24

5. Which one of the following statements is incorrect?

The atoms of the same element, having the same mass number but different atomic numbers are called Isotopes.

Protons are present in the nucleus of an atom.

Elements are defined by the number of protons they possess.

Isobars have different atomic number.

Question 5 of 24

6. Argon has atomic number of 18 and mass number of 40. Calcium has atomic 20 and mass number 40. Calcium and argon are examples of _______ .

isotopes

isobars

isotones

isochores

Question 6 of 24

7. The isotopic composition of a certain element X is 80% ²⁴X, 10% ²⁵X and 10% ²⁶X. The relative-atomic mass of X is _______ .

24.67

24.25

24.33

24.30

Question 7 of 24

8. Atomic number is equal to:

Number of protons + Number of electrons

Number of protons

Number of protons + Number of neutrons

Number of neutrons

Question 8 of 24

9. Why do isotopes have different physical properties?

Isotopes of an element have different electronic configuration.

Isotopes have same atomic number.

Isotopes of an element have different mass number.

Isotopes of an element have different atomic number.

Question 9 of 24

10. An element B has 5 protons and 6 neutrons. What will be the symbol of the element B?

11₆B

11B

11₅B

⁵₁₁B

Question 10 of 24

11. The atomic number of an element having mass number 23 and number of neutron 12 is ________ .

23

11

12

35

Question 11 of 24

12. Which form of iodine is used for the treatment of goiter?

An isotone

An isobar

An isochore

An isotope

Question 12 of 24

13. The total number of neutrons in ¹²₂₄Mg²⁺is:

24

12

10

14

Question 13 of 24

14. Neon occurs as two isotopes of mass numbers 20 and 22. Its relative atomic mass is 20.2. What is the percentage of ²⁰Ne in naturally occurring neon?

90

20

80

10

Question 14 of 24

15. Which of the following elements has 17 electrons and 17 protons?

Sodium

Sulphur

Chlorine

Aluminium

Question 15 of 24

16. Find the symbol of an element X, if its mass number is A and atomic number is Z respectively.

A

B

C

D

Question 16 of 24

17. The atomic number and the mass number of an element A are 14 and 28 respectively. The number of neutrons are:

42

12

28

14

Question 17 of 24

18. Which of the following statement is correct for isotopes?

Isotopes have different mass numbers.

Isotopes have different chemical properties.

Isotopes have same physical properties.

Isotopes have different atomic numbers.

Question 18 of 24

19. An neutral element A has 3 electrons, the atomic number of an element is _______ .

1

2

5

3

Question 19 of 24

20. An atom is represented by symbol ²³₁₄M. What does the number 23 represent?

Mass number

Atomic number

Number of protons

Number of neutrons

Question 20 of 24

21. ASSERION-Atomic mass is always concentrated inside the nucleus.

REASON-protons are always embedded inside the core of atoms.

a) Both Assertion and Reason are correct, and reason is the correct explanation for assertion.

b) Both Assertion and Reason are correct, and Reason is not the correct explanation for Assertion.

c) Assertion is true but Reason is false.

d.) Assertion is false but Reason is true.

Question 21 of 24

22. ASSERTION-The sum of proton no. and neutron no. gives us atomic mass number of atom.

REASON-Proton no. and neutron no. is always same.

a) Both Assertion and Reason are correct, and reason is the correct explanation for assertion.

b) Both Assertion and Reason are correct, and Reason is not the correct explanation for Assertion.

c) Assertion is true but Reason is false.

d.) Assertion is false but Reason is true.

Question 22 of 24

23. ASSERTION-Thomson’s says that atoms consist of positively charged sphere and the electrons are embedded in it.

REASON-Positively charged ions always spread inside the core of atoms

a) Both Assertion and Reason are correct, and reason is the correct explanation for assertion.

b) Both Assertion and Reason are correct, and Reason is not the correct explanation for Assertion.

c) Assertion is true but Reason is false.

d.) Assertion is false but Reason is true.

Question 23 of 24

24. Assertion : Isobars are identical in chemical properties.
Reason : Isobars have different atomic numbers but same mass number.

a.) Both Assertion and Reason are correct, and reason is the correct explanation for assertion.

b.) Both Assertion and Reason are correct, and Reason is not the correct explanation for Assertion.

c.) Assertion is true but Reason is false.

d.) Assertion is false but Reason is true.

Question 24 of 24

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