Class 9  >  General Science(Prelims) by IRS Divey Sethi  >  Important Questions (1 mark): Structure of the Atom Download as PDF

Important Questions (1 mark): Structure of the Atom


Test Description

25 Questions MCQ Test General Science(Prelims) by IRS Divey Sethi | Important Questions (1 mark): Structure of the Atom

Important Questions (1 mark): Structure of the Atom for Class 9 2022 is part of General Science(Prelims) by IRS Divey Sethi preparation. The Important Questions (1 mark): Structure of the Atom questions and answers have been prepared according to the Class 9 exam syllabus.The Important Questions (1 mark): Structure of the Atom MCQs are made for Class 9 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Important Questions (1 mark): Structure of the Atom below.
Solutions of Important Questions (1 mark): Structure of the Atom questions in English are available as part of our General Science(Prelims) by IRS Divey Sethi for Class 9 & Important Questions (1 mark): Structure of the Atom solutions in Hindi for General Science(Prelims) by IRS Divey Sethi course. Download more important topics, notes, lectures and mock test series for Class 9 Exam by signing up for free. Attempt Important Questions (1 mark): Structure of the Atom | 25 questions in 25 minutes | Mock test for Class 9 preparation | Free important questions MCQ to study General Science(Prelims) by IRS Divey Sethi for Class 9 Exam | Download free PDF with solutions
1 Crore+ students have signed up on EduRev. Have you?
Important Questions (1 mark): Structure of the Atom - Question 1

Which of the following is regarded as a universal particle?

Detailed Solution for Important Questions (1 mark): Structure of the Atom - Question 1

Electron is presents in all atoms. So, electron is regarded as universal particle.Electron are distributed in shell around the nucleus.

Important Questions (1 mark): Structure of the Atom - Question 2

The main subatomic particles of nucleus are-

Detailed Solution for Important Questions (1 mark): Structure of the Atom - Question 2

The main subatomic particles of nucleus are proton and neutron. Electrons are located in different shells of an atom.

Important Questions (1 mark): Structure of the Atom - Question 3

What is name given to the number of protons in the nucleus of the atom?

Detailed Solution for Important Questions (1 mark): Structure of the Atom - Question 3

Number of protons in the nucleus of an atom is equal to atomic number. Sum of number of proton and neutron present in nucleus is called mass number.

Important Questions (1 mark): Structure of the Atom - Question 4

The atom which does not contain any neutron in the nucleus is

Detailed Solution for Important Questions (1 mark): Structure of the Atom - Question 4

An isotopes of Hydrogen called protium does not contain any neutron. It contain one electron and one proton.

Important Questions (1 mark): Structure of the Atom - Question 5

Who discovered anode rays?

Detailed Solution for Important Questions (1 mark): Structure of the Atom - Question 5

Anode rays were discovered by E. Goldstein as canal rays. They are positively charged particles.

Important Questions (1 mark): Structure of the Atom - Question 6

Match the following with correct response. 

Important Questions (1 mark): Structure of the Atom - Question 7

There are 14 protons and 13 neutrons on the nucleus of an element. What is its mass number?

Detailed Solution for Important Questions (1 mark): Structure of the Atom - Question 7

Mass number of an atoms is equal to the sum of number of proton and neutron present in the nucleus of the atom. So, mass number of given element = 14 +13 = 27 u.

Important Questions (1 mark): Structure of the Atom - Question 8

“Electrons present in the extra nuclear portion are not stationary rather they revolve around the nucleus at high speed following a circular path” Who said this?

Detailed Solution for Important Questions (1 mark): Structure of the Atom - Question 8

In his model of atom, Rutherford stated that electrons present in the extra nuclear portions are not stationary rather they revolve around the nucleus at high speed following circular path.

Important Questions (1 mark): Structure of the Atom - Question 9

Match the following with correct response. 

Important Questions (1 mark): Structure of the Atom - Question 10

Nitrogen atom has atomic mass of 14 u and has 7 protons in its nucleus. How many neutrons does it have?

Detailed Solution for Important Questions (1 mark): Structure of the Atom - Question 10

Atomic mass of Nitrogen is 14 u and number of protons in nucleus is 7. So, number of neutron = Mass number – number of protons = 14-7 = 7.

Important Questions (1 mark): Structure of the Atom - Question 11

Match the following with correct response. 

Important Questions (1 mark): Structure of the Atom - Question 12

In an alpha scattering experiment, few alpha particles rebounded because

Detailed Solution for Important Questions (1 mark): Structure of the Atom - Question 12

In an alpha scattering,few alpha particles rebounded because both alpha particle and nucleus have positive .So,the both of these particles repel each other and nucleus is very dense so alpha particles rebounded.

Important Questions (1 mark): Structure of the Atom - Question 13

Match the following with correct response. 

Important Questions (1 mark): Structure of the Atom - Question 14

Atomic number is defined as

Detailed Solution for Important Questions (1 mark): Structure of the Atom - Question 14

Atomic number is defined as the number of protons present in the nucleus of an atom.

Important Questions (1 mark): Structure of the Atom - Question 15

Isotopes of an element have 
A. Same chemical properties
B. Same atomic masses
C. Differeat atomic numbers
D. Atoms of same element

Detailed Solution for Important Questions (1 mark): Structure of the Atom - Question 15 They have similar chemical properties because isotopes of an element have the same number of electrons as an atom of that element .the electron arrangement is the same owing to same chemical properties how ever they have different number of neutrons which affects the mass and number
Important Questions (1 mark): Structure of the Atom - Question 16

How many times is radius of extra nuclear portion more than that of the nucleus of an atom?

Detailed Solution for Important Questions (1 mark): Structure of the Atom - Question 16

The radius of extra nuclear portion is more than that of the nucleus of an atom. Nuclear region is small portion of atom as compared to whole atom.

Important Questions (1 mark): Structure of the Atom - Question 17

Match the following with correct response. 

Important Questions (1 mark): Structure of the Atom - Question 18

An atom has a mass number of 23 and atomic number 11. The number of protons are_________.

Detailed Solution for Important Questions (1 mark): Structure of the Atom - Question 18 The correct option is a. as sodium atom has atomic no 11and atomic no definition itself says that the total no of protons present inside the nucleus of an atom is known as atomic noso no of protons will be 11
Important Questions (1 mark): Structure of the Atom - Question 19

How many electrons are present in the species He2+ion?

Detailed Solution for Important Questions (1 mark): Structure of the Atom - Question 19

The correct answer is D as its atomic number is 2

it contains 2 electrons and in order to from He2+ ion, it will have to lose its 2 electrons.

Important Questions (1 mark): Structure of the Atom - Question 20

Who got the Noble Prize for the work on the structure of atom?

Detailed Solution for Important Questions (1 mark): Structure of the Atom - Question 20

Neil Bohr got the noble prize for the work on the structure of atom. He proposed the Bohr model of atom having desecrate shell in which electrons are distributed

Important Questions (1 mark): Structure of the Atom - Question 21

Which of the following is not observed by Rutherford in the α-particle scattering experiment? 
A. Most of the α-particle rebound after hitting the gold foil 
B. Some of the particles deflect by their path
C. Some of the particles did not pass through the gold foil
D. Most of the particles pass straight through the gold foil

Detailed Solution for Important Questions (1 mark): Structure of the Atom - Question 21

The correct answer is B as the α-particle scattering experiment gave totally unexpected results.
The following observations were made: 
(i) Most of the fast moving -particles passed straight through the gold foil. 
(ii) Some of the -particles were deflected by the foil by small angles.
(iii) Surprisingly one out of every 12000 particles appeared to rebound.

Important Questions (1 mark): Structure of the Atom - Question 22

Write number of neutrons in

Detailed Solution for Important Questions (1 mark): Structure of the Atom - Question 22

Magnesium (Mg) contains 12 proton and mass number is 24. Number of neutron is equal to mass number – number of proton present in nucleus. So, number of neutron = 24-12 = 12.

Important Questions (1 mark): Structure of the Atom - Question 23

In a species, the number of electrons is more than the number of protons. Predict its nature.

Detailed Solution for Important Questions (1 mark): Structure of the Atom - Question 23

Anion contain more electron than proton because anion are formed by receiving electrons from other atoms.

Important Questions (1 mark): Structure of the Atom - Question 24

Out of L and M shells which is near to the nucleus of an atom?

Detailed Solution for Important Questions (1 mark): Structure of the Atom - Question 24

The order of shell around the nucleus is in order of K, L, M, N from nucleus to outward. So, L shell is nearer to the nucleus than M shell.

Important Questions (1 mark): Structure of the Atom - Question 25

Which of the following is correct about atom? 
A. It is the smallest unit of matter 
B. Size of atom is very large as compared to the nucleus of the atom 
C. In an atom number of protons is equal to number of electrons 
D. Atoms are stable

Detailed Solution for Important Questions (1 mark): Structure of the Atom - Question 25

The nucleus is made up of protons and, in most cases, neutrons. An atomic nucleus is much, much smaller than an atom. The cloud of electrons that "orbit" the nucleus and define the "size" of an atom is roughly 100,000 times as large as that atom's nucleus.

Use Code STAYHOME200 and get INR 200 additional OFF
Use Coupon Code
Information about Important Questions (1 mark): Structure of the Atom Page
In this test you can find the Exam questions for Important Questions (1 mark): Structure of the Atom solved & explained in the simplest way possible. Besides giving Questions and answers for Important Questions (1 mark): Structure of the Atom, EduRev gives you an ample number of Online tests for practice