Structure Of The Atoms Test-03

Structure Of The Atoms Test-03

This is Structure Of The Atoms Test-03 for CBSE class 09 Science.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
What is name given to the number of protons in the nucleus of the atom?
  • A
    Isobar
  • B
    Isotope
  • C
    Mass number
  • D
    Atomic number
    Correct
2
There are 14 protons and 13 neutrons on the nucleus of an element. What is its mass number?
  • A
    13
  • B
    17
  • C
    27
    Correct
  • D
    29
3
Nitrogen atom has atomic mass of 14 u and has 7 protons in its nucleus. How many neutrons does it have?
  • A
    14
  • B
    21
  • C
    7
    Correct
  • D
    3.5
4
Atomic number is defined as
  • A
    The number of electrons they possess
  • B
    The number of protons they possess
    Correct
  • C
    All of these
  • D
    The number of neutrons they possess.
5
Which of the two will be chemically more reactive; element X with atomic number 16 or element Y with atomic number 17.
  • A
    Element X
  • B
    Can’t say
  • C
    Both the Elements X and Y are equally reactive
  • D
    Element Y
    Correct
6
Write number of neutrons in \({}_{12}^{24}Mg\)
  • A
    13
  • B
    12
    Correct
  • C
    11
  • D
    14
7
The atom of which element has twice as many electrons in its second shell as in the first shell
  • A
    N
  • B
    C
    Correct
  • C
    Be
  • D
    Li
8
Which isotope of Hydrogen is known as protium?
  • A
    All of these
  • B
    \({}_1^3H\)
  • C
    \(_1^1H\)
    Correct
  • D
    \(_1^2H\)
9
The two isotopic forms of chlorine with masses 35 u and 37 u occur in the ratio of
  • A
    3 : 1
    Correct
  • B
    1: 3
  • C
    2: 1
  • D
    1: 2
10
Find the incorrect pair
  • A
    Isotope of Uranium – Fuel in nuclear reactor
  • B
    Isotope of Carbon – Radio isotope dating technique
  • C
    Isotope of cobalt – cancer treatment
  • D
    Isotope of iodine – Cancer treatment
    Correct
11
Which radioactive isotope is used for the treatment of cancer?
  • A
    Co – 60
    Correct
  • B
    I – 139
  • C
    N – 15.
  • D
    C – 14
12
Statement A: Nucleus of an atom is massive and electrically neutral in nature. Statement B: Isotopes of an element are chemically similar. Which of the two statement is true
  • A
    Statement A
  • B
    None of these
  • C
    Statement B
    Correct
  • D
    Both a and b
13
Which of the following is not the characteristic of isotopes?
  • A
    Isotopes of some elements are of radioactive nature.
  • B
    Isotope are the different atoms of the same element.
  • C
    Isotopes differ in the number of neutron
  • D
    Physical properties of isotopes are same
    Correct
14
Which two of the following nuclei are isotopes of each other? \({}_{90}^{231}Z{\text{, }}{}_{91}^{230}Z,{\text{ }}{}_{88}^{230}Z,{\text{ }}{}_{90}^{233}Z\)
  • A
    \({}_{90}^{231}Z,{}_{88}^{230}Z\)
  • B
    \({}_{91}^{230}Z,{}_{88}^{230}Z\)
  • C
    \({}_{90}^{231}Z,{}_{91}^{230}Z\)
  • D
    \({}_{90}^{231}Z,{}_{90}^{233}Z\)
    Correct
15
Which of the following nucleus will be unstable?
  • A
    \({}_8^{16}O\)
  • B
    \({}_6^{14}C\)
    Correct
  • C
    \({}_7^{14}N\)
  • D
    All of these