Cathode rays are deflected by ____.

Correct! Wrong!

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Cathode rays are deflected by both electric field and magnetic field

An isotope of ____ is used in the treatment of cancer.

Correct! Wrong!

The isotope of cobalt (Co-60) is used in the treatment of cancer.

The number of protons in an atom X, with atomic number Z and mass number A are ____.

Correct! Wrong!

The numbers of protons in an atom X of atomic number Z is Z, since,the number of protons is equal to the atomic number (Z) of an atom.

The N-shell can accommodate a maximum of 32 electrons.

Correct! Wrong!

The maximum number of electrons that can be accommodated in the N-shell (fourth shell) are 32.

The sub-atomic particle whose relative charge is 0 is ____.

Correct! Wrong!

The sub-atomic particle whose relative charge is 0 is neutron

Mass of an electron is ____.

Correct! Wrong!

Mass of an electron is 9.1 x 10 -28 g

The number of electrons in the L-shell of sodium atom is ____.

Correct! Wrong!

In the L-shell of the sodium atom there are 8 electrons . The electronic configuration of sodium atom is 2,8,1 (K,L,M).

Which is the incomplete shell in Li atom?

Correct! Wrong!

The electronic configuration of Li is 2,1(K,L). Hence, L-shell of lithium atom is incomplete.

The idea of fixed energy levels in an atom was given by ____.

Correct! Wrong!

Neils Bohr gave the concept of fixed energy levels for electrons in an atom.

The electronic configuration of oxygen atom is ____.

Correct! Wrong!

The atomic number of oxygen is 8. Therefore, the electronic configuration of oxygen atom is 2,6.

7N14 and 7N15 represents ____.

Correct! Wrong!

Isotopes have same atomic number but different mass number. As 7N14 and 7N15 have same atomic number, they are isotopes.

The number of electrons in the last shell of krypton are ____.

Correct! Wrong!

Krypton has 8 electrons in its last shell.

____ were not present in Thomson’s model.

Correct! Wrong!

The neutrons were not present in Thomson's model, as then they were not discovered.

J.J. Thomson conducted his experiments related to an atom in a ____.

Correct! Wrong!

J.J. Thomson conducted his experiments related to atom in a CRT(cathode ray tube).

The space between a proton and electron in an atom is ____.

Correct! Wrong!

The space between a proton and electron in hydrogen atom is empty.

The maximum number of electrons that can be accommodated in the innermost shell are ____.

Correct! Wrong!

The innermost shell in an atom is K-shell and it can accommodate a maximum of 2 electrons.

The number of valence electrons in neon atom are ____.

Correct! Wrong!

In neon atom there are 8 valence electrons

The electron was discovered by ____.

Correct! Wrong!

The electron was discovered by J.J.Thomson.

Which of the following atoms do not have neutrons?

Correct! Wrong!

Hydrogen atom has no neutrons. It has 1 electron and 1 proton.

The electronic configuration of an element with atomic number 12 is ____.

Correct! Wrong!

The electronic configuration of an element with atomic number 12 is 2,8,2.

Bohr's model could not explain the stability of an atom.

Correct! Wrong!

Bohr enhanced Rutherford's model of an atom by explaining the stability of an atom.

Rutherford's scattering experiment showed the presence of ____ in an atom.

Correct! Wrong!

Rutherford scattering experiment showed the presence of nucleus in an atom.

Moving electrons create ____.

Correct! Wrong!

Moving electrons create a magnetic as well as an electric field.

Which of the following rays are used for diagnostic purposes?

Correct! Wrong!

X-rays are used for diagnostic purposes.

If a neutral atom has two shells completely filled up, then atomic number of the atom is ____.

Correct! Wrong!

A neutral atom with first two shells complete is 10. K+L=2+8=10 . The atomic number of the atom is 10.

The number of electrons in an atom is 8 and the number of protons is 7. Then the charge on an atom will be ____

Correct! Wrong!

As the number of protons is one less than the number of electrons, the charge will be −1.

Isotopes are ____.

Correct! Wrong!

Isotopes are atoms of same element having same atomic number but different mass number.

The doubly charged helium ion is called ____.

Correct! Wrong!

The doubly charged helium ion is called an alpha particle.

The plum pudding model of an atom was proposed by ____.

Correct! Wrong!

Thomson proposed the plum pudding model of an atom. According to Thomson, negative particles are distributed in a mass of positive charge

CBSE Class 9th Science 4 - Structure of the Atom MCQs
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