022/2023 - Junior Scientific Assistant

Question 1

According to quantum mechanics, it is impossible to precisely and simultaneously specify both the linear momentum and position of a particle. This principle is known as :

Accepted Answer

Heisenberg’s uncertainty principle

Answer

Pauli’s antisymmetric principle

Answer

Hund’s principle of maximum spin multiplicity

Answer

Aufbau principle

Question 2

The Schrödinger equation consists of an energy operator known as :

Accepted Answer

Hamiltonian

Answer

Hermitian

Answer

Wave function

Answer

Legendre

Question 3

The energy required to remove the outermost or valence electron from the isolated gaseous atom is called the first ionization energy. Which of the following elements has the lowest ionization energy?

Accepted Answer

Li

Answer

Be

Answer

C

Answer

F

Question 4

Which of the following is in correct order of electro negativity values in Pauling’s scale?

Accepted Answer

F > Cl > Br > I

Answer

Cl > Br > I > F

Answer

F > Cl > I > Br

Answer

I > Br > F > Cl

Question 5

In quantitative chemical analysis, the term precision refers to :

Accepted Answer

Reproducible result

Answer

Accurate result

Answer

Theoretical result

Answer

Abnormal result

Question 6

Which of the following radiation is employed to study vibrational spectrum of a molecule?

Accepted Answer

Infrared radiation

Answer

Microwave radiation

Answer

Ultraviolet radiation

Answer

X-ray

Question 7

In order to record the proton NMR spectrum, which of the following compound is used as reference :

Accepted Answer

Tetramethylsilane

Answer

Dimethyl sulphoxide

Answer

D₂O

Answer

CDCl₃

Question 8

Paper chromatography is an example of :

Accepted Answer

Partition chromatography

Answer

Adsorption chromatography

Answer

Ion exchange chromatography

Answer

High Performance liquid chromatography

Question 9

The analytical technique that involves observing the change in weight of the substance as a function of temperature is called :

Accepted Answer

Thermogravimetry

Answer

Mass spectrometry

Answer

Differential scanning calorimetry

Answer

Differential thermal analysis

Question 10

For the coagulation of negatively charged sol As₂S₃ , which of the following species will be more effective?

Accepted Answer

Al³⁺

Answer

Na⁺

Answer

Cl⁻

Answer

Au

Question 11

Gold number of A, B, C, and D are 0.13, 0.013, 0.003 and 0.31. The order of protective power of these is :

Accepted Answer

C > B > A > D

Answer

A > B > C > D

Answer

D > A > B > C

Answer

None of the above

Question 12

Considering various theories of adsorption of gases on solids, which of the following is incorrect :

Accepted Answer

Langmuir isotherm is of empirical nature

Answer

Langmuir isotherm is based on monolayer adsorption

Answer

BET isotherm is based on multilayer adsorption

Answer

Freundlich isotherm is of empirical nature

Question 13

The gas that is known to damage the ozone layer in stratosphere is :

Accepted Answer

CF₂Cl₂

Answer

HCl

Answer

CN₃CH

Answer

Pb(C₂H₅)₄

Question 14

The disease itai-itai is caused by pollution due to :

Accepted Answer

Cd

Answer

Hg

Answer

Pb

Answer

DDT

Question 15

Eutrophication causes :

Accepted Answer

Water pollution

Answer

Air pollution

Answer

Soil pollution

Answer

Noise pollution

Challenge Yourself

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Mock Test

022/2023 - Junior Scientific Assistant