9th Science SET 2

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Free Online Best 9th Class Science Questions for improve your knowledge of Science Subject and General Knowledge for competitive exams. This 9th Science Set 2 test that contains 25 Multiple Choice Questions with 4 options. You have to select the right answer to a question.

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Question 1

An element X is divalent and another element Y is tetravalent. The compound formed by these two elements will be____

A	XY
B	XY2
C	X2Y
D	XY4

Question 2

Which of the following elements does not exhibit the electrovalencey?

A	Sodium
B	calcium
C	carbon
D	chlorine

Question 3

Which of the following represents the correct relation between Avogadro’s number (No), number of particles (N) and moles (n)?

A	n = N / No
B	n = No / N
C	n = N*No
D	all of the Above

Question 4

Molecular mass is defined as the___

A	Mass of one molecule of any substance compared with the mass of one atom of C – 12
B	Mass of one atom compared with the mass of one atom of hydrogen
C	Mass of one atom compared with the mass of one molecule
D	none of these

Question 5

The amount of solute present per unit volume or per unit mass of the solution/solvent is known as_____

A	Composition of solute
B	Concentration of a solvent
C	Concentration of a solute
D	Concentration of a solution

Question 6

Which isotope is used in the nuclear power plants to generate electricity?

A	Uranium 235
B	Iodine 131
C	Cobalt 60
D	Uranium 238

Question 7

Which of the following does not match the characteristics of an Isotope?

A	Isotopes of some elements are radioactive
B	Isotopes are the atoms of different elements
C	Isotopes differ in number of neutrons
D	Isotopes have similar chemical properties

Question 8

1 u or 1 amu means____

A	1/12th mass of C-12 atoms
B	Mass of C-12 atom
C	Mass of O-16 atom
D	Mass of Hydrogen molecule

Question 9

How many atoms of oxygen are present in 300 grams of CaCO3?

A	54.207 × 1023
B	6.207 × 1023
C	12.207 × 1023
D	22.2 × 1023

Question 10

The molecular formula of potassium nitrate is______

A	KNO3
B	KNO
C	KNO2
D	KON

Question 11

3.42 g of sucrose are dissolved in 18 g of water in a beaker. The numbers of oxygen atoms in_____

A	6.68 ×1023
B	6.09 ×1022
C	6.022 ×1023
D	6.022 ×1021

Question 12

According to the definition of pure substance, which of the following is a pure substance?

A	ice
B	mercury
C	iron
D	all of the Above

Question 13

What was the source of alpha particles in Rutherford scattering experiment?

A	Hydrogen nucleus
B	Argon nucleus
C	Argon nucleus
D	None of the Above

Question 14

Which of the two will be chemically more reactive, Sulphur(S) with atomic number 16 or Chlorine (Cl) with atomic number 17?

A	Chlorine
B	Sulphur
C	Sulphur
D	Can’t say

Question 15

A change in the physical state can be brought about____

A	only when energy is taken out from the system
B	When energy is either given to, or taken out from the system
C	Without any energy change
D	only when energy is given to the system

Question 16

The atomic mass of sodium is 23. The number of moles in 46g of sodium is ________

A	4
B	2
C	0
D	½

Question 17

What is the formula mass unit of ZnO?

A	18 u
B	81u
C	88u
D	188u

Question 18

Which scientist gave the concept of fixed energy levels around the nucleus?

A	Ernest Rutherford
B	Neils Bohar
C	J.J.Thomsan
D	None of the Above

Question 19

Which of the following represents a correct chemical formula?

A	CaCl
B	BiPO4
C	NaSO4
D	NaS

Question 20

Which of the following statements is not true about an atom?

A	Atoms are not able to exist independently.
B	Atoms are the basic units from which molecules and ions are formed
C	Atoms are always neutral in nature.
D	Atoms aggregate in large numbers to form the matter that we can see, feel or touch.

Question 21

Who discovered the electron?

A	Rutherford
B	Chadwick
C	Thomson
D	Goldstein

Question 22

What property of an element determines its chemical behaviour?

A	Size of an element
B	Valency of an element
C	Molar mass of the element
D	None of the Above

Question 23

Which of the following contains maximum number of molecules?

A	19 CO2
B	1 g N2
C	1 g H2
D	1 g CH4

Question 24

A sample of NH3 molecule irrespective of source contains 82.35% Nitrogen and 17.65% of Hydrogen by mass. This data supports___

A	Law of Conservation of Mass
B	Las of Multiple Proportions
C	Law of Definite Proportions
D	Avogadro’s Law

Question 25

Which of the following correctly represents 360g of water? (1) 2 moles of water (2)20 moles of water (3) 6.022 × 1023 molecules of water (4) 1.2044 × 1025 molecules of water

A	1
B	1 and 2
C	2 and 3
D	2 and 4

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