MCQs 1 on STRUCTURE OF THE ATOM => 9th Class

noreply@blogger.com (Unknown) — Sat, 27 Oct 2018 04:49:00 +0000

MCQs on Chemistry => 9th Class solve online MCQs on Chemistry(STRUCTURE OF THE ATOM) => 9th Class for competitve examinations like CBSE Neet, CBSE Board, CSIR NET, GRE etc.

1. The charge/ mass ratio of electron:

Depends on the nature of the electrodes
Depends upon nature of the gas c. Remains constant
Remains constant
Depends on both nature of the gas and nature of the electrode

2. A student weighs 30kg. Suppose his body is entirely made of electrons. How any electrons are there in his body? Mass of an electron= 9.1X10-31kg

3.29 X10³¹
3.29 X10³⁰
3.29 X10²³
3.29 X10³²

3. Which of the following is correct?
A. Electrons = > i. Positive charge
B. Protons => ii. No charge
C. Neutrons => iii. Negative charge

A-iii, B-ii, C-i
A-iii, B-i, C-ii
A-ii, B-iii, C-i
A-ii, B-i, C-iii

4. Which of the following are positively charged ions:

A and B
C and D
B and D
D and F

5. If K, L, M, N shells of an atom are full, the total number of electrons in the atom are:

6. The electronic configuration of Cl(17) is:

2,8,7
2,2, 8,5
2,8,2,5
2,2,5,8

7. Composition of the nuclei of two atomic species are given:

The mass number of x and Y and their relation is

16,16; isotopes
17,15; isotopes
17,15; isotopes
16,16; 1sobars

8. Na⁺ has 12 neutrons and 10 electrons. Which of the following statements is correct?

Na⁺ has atomic number 10 and mass number 22.
Na⁺ has atomic number 11 and mass number 23.
Na⁺ has atomic number 10 and mass number 23.
Na⁺ has atomic number 11 and mass number 22.

9. Which of the following statement is correct about proton?

It is the nucleus of deuterium
It is an ionized hydrogen molecule
It is an ionized Hydrogen atom
It is an α particle with unit positive charge

10. The highest value of e/m ratio for anode rays is observed when the discharge tube is filled with:

N₂
H₂
He
Ar

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MCQs 1 on STRUCTURE OF THE ATOM => 9th Class

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