Class IX_NCERT_All Chapters

The number of neutrons in U²³⁸ is

• 143

• 144

• 145

• 146

The Latin name for Tungsten is:

• Wolfram

• Argentum

• Kalium

• Hydrargyrum

The number of electrons in Zn⁺² is

• 28

• 29

• 30

• 31

The movement of colloidal particles towards the oppositely charged electrode under the influence of an electric field is called:

• Centrifugation

• Electrophoresis

• Tyndall Effect

• Brownian Motion

On a hypothetical exoplanet, the abundance of the isotopes of Pb are as follows:

²⁰⁶Pb: 25 %

²⁰⁷Pb: 25 %

²⁰⁸Pb: 50 %

The average atomic mass of Lead is:

• 207 u

• 207.25 u

• 208 u

• 206.75 u

--------------------- in 1886 discovered the presence of new radiations in a gas discharge and called them canal rays.

• E. Goldstein

• J.J. Thomson

• Ernest Rutherford

• J. Chadwick

The number of electrons in 'M' shell of Titanium is:

• 8

• 10

• 11

• 12

The chemical formula of Potassium dichromate is

• KCrO₄

• K₂CrO₄

• K₂Cr₂O₇

• None

In Bohr's postulates, angular momentum of an electron is an integral multiple of:

• h/2π

• h/3π

• h/4π

• None

The specific charge of an electron is -1.76 x 10^y C/kg. y is ------------

• 10

• -10

• -11

• 11