laboursonline – MCQs, Mock Tests | Biology Biology MCQ Question

Greater shielding effect corresponds to ionization energy value

1. Greater
2. Lesser
3. Remain same
4. No effect

✅ Correct Answer: 2

Elements having high I.P values are

1. Metals
2. Non metals
3. Liquids
4. Solids

✅ Correct Answer: 2

Energy released or absorbed when electrons are added in atom is

1. Ionization potential
2. Electronegativity
3. Electron affinity
4. Activation energy

✅ Correct Answer: 3

In a period electronegativity from left to right

1. Increases
2. Decreases
3. Remain constant
4. Variable trend

✅ Correct Answer: 1

Ionic bond is produced after complete transfer of

1. Nucleus
2. Neutrons
3. Electrons
4. Protons

✅ Correct Answer: 3

Elements of group IA IIA are

1. Electronegative
2. Electropositive
3. Neutral
4. IA is electropositive while IIA is electronegative

✅ Correct Answer: 2

Bond will beionic when E.N difference of bonded atom is

1. Equal to 1.7
2. Greater than 1.7
3. Less than 1.7
4. No specificity exists

✅ Correct Answer: 2

Mostly ionic compound are produced in between elements of

1. IA and VIA
2. IA IIA and VIIA
3. IB and VIIB
4. IA and IB

✅ Correct Answer: 2

Which one of the following has polar covalent bond?

1. HF
2. CH4
3. H2
4. N2

✅ Correct Answer: 1

The Lewis acids are

1. Electron deficient
2. Electron rich
3. Octet is complete
4. No such acids exist

✅ Correct Answer: 1

Sharing of 1 electron pair by one specie forms

1. Single covalent bond
2. Hydrogen bond
3. Double covalent bond
4. Coordinate covalent bond

✅ Correct Answer: 4

Angle in water molecule is

1. 104.9?
2. 104.5?
3. 109.5?
4. 120?

✅ Correct Answer: 2

The geometry of ammonia is

1. Tetrahedral
2. Square planner
3. Trigonal bipyramidal
4. Trigonal Pyramidal

✅ Correct Answer: 4

Orbitals of same energy produced after mixing of orbitals of different energy are called

1. Degenerate orbitals
2. Generate orbitals
3. Hybrid orbitals
4. Zeeman orbitals

✅ Correct Answer: 1

By combining n atmic orbitals no. of hybrid orbitals will be

1. 2n
2. n
3. 3n
4. impossible to predict

✅ Correct Answer: 2

on sp3 hybridization

1. All p-orbitals are involved
2. One s and 3 p-orbitals are involved
3. one p-orbital is involved
4. four p-orbitals are involved

✅ Correct Answer: 2

Geometry of simple molecule having sp3 hybrid orbital is

1. Triangular
2. Tetrahedral
3. Square planner
4. Linear

✅ Correct Answer: 2

Geometry of molecule will be pyramidal if the outer post shell of the central atom has

1. 3 bond pair one lone pair
2. 2 bond pair 2 lone pair
3. 1 bond pair 3 lone pair
4. 3 lone pair 1 bond pair

✅ Correct Answer: 1

Pi bonds are produced by overlapping of

1. Un-hybrid orbitals
2. Hybrid orbitals
3. Hybrid and un hybrid orbitals
4. atomic orbital and hybrid orbital

✅ Correct Answer: 1

According to VESPR Model the geometry of molecule having 5 bond pair in outer most shell will be

1. Triangular
2. Square planner
3. Trigonal bipyramidal
4. Octahedral

✅ Correct Answer: 3

Molecular orbital which have higher energy than atomic orbitals is called

1. Bonding molecular orbital
2. Antibonding molecular orbital
3. Hybrid orbital
4. Super atomic orbital

✅ Correct Answer: 2

Unpaired electron in a molecule gives _________ character.

1. Ferromagnetic
2. Paramagnetic
3. Diamagnetism
4. Both a & b

✅ Correct Answer: 2

Bond order for N2 molecule is

1. 2
2. 1
3. 3
4. 4

✅ Correct Answer: 3

Product of charge and distance is called

1. Pressure
2. Bond length
3. Work
4. Dipole moment

✅ Correct Answer: 4

Unit of dipole moment is

1. Debye
2. Poise
3. Pascal
4. Newton

✅ Correct Answer: 1

Which of the following solutions of H2SO4 is more concentrated?

1. 1 Molar solution
2. 1 molal solution
3. 1 normal solution
4. all have same concentration

✅ Correct Answer: 1

The complete reduction carboxylic acid results in the formation of

1. Alkyne
2. Alkene
3. Alkane
4. Alcohol

✅ Correct Answer: 3

The organic acid that can be made from ethanol is

1. Acetic acid
2. Formic acid
3. Butanoic acid
4. Citric acid

✅ Correct Answer: 1

Picric acid is

1. monocarboxylc acid
2. dicarboxylic acid
3. aromatic carboxylic acid
4. none of these

✅ Correct Answer: 4

The formula of palmitic acid

1. C15H31COOH
2. C13H27COOH
3. C17H33COOH
4. C17H35COOH

✅ Correct Answer: 1

Essential amino acids are

1. 5
2. 10
3. 15
4. 20

✅ Correct Answer: 2

The aliphatic monocarboxylic acids are obtained by the hydrolysis of

1. proteins and oild
2. fats and proteins
3. fats and oils
4. all above

✅ Correct Answer: 3

Which of the following is not a fatty acid?

1. Propanoic acid
2. Acetic acid
3. Phthalic acid
4. Butanoic acid

✅ Correct Answer: 3

An acid with unpleasant smell

1. formic acid
2. acetic acid
3. propionic acid
4. butyric acid

✅ Correct Answer: 4

The basic hydrolysis of ethyl acetate produces

1. ethanol
2. acetic acid
3. ethanol and acetic acid
4. ethanol and sodium acetate

✅ Correct Answer: 4

Carboxylic acid on reduction with HI / phosphorous yields

1. alkane
2. alcohols
3. aldehydes
4. ketones

✅ Correct Answer: 1

Which of the following is not an ester

1. amyl acetate
2. sodium butyrate
3. isobutyle formate
4. octyl acetate

✅ Correct Answer: 2

The reaction of carboxylic acids with alcohols in presence of cone. H2SO4 is called

1. esterification
2. neutralization
3. hydrolysis
4. saponification

✅ Correct Answer: 1

Which of the following has orange flavour

1. isobutyl formate
2. octyl acetate
3. ethyl butyrate
4. amyl lactate

✅ Correct Answer: 2

Which of the following is not an amino acids

1. glumatic acid
2. lactic acid
3. aspartic acids
4. glycine

✅ Correct Answer: 2

Amino acids present in cheese

1. lysine
2. alanine
3. tyrosine
4. proline

✅ Correct Answer: 3

? - amino succinic acid is also called

1. lysine
2. aspartic acid
3. alanine
4. glutamic acid

✅ Correct Answer: 2

Which of the following is an unsaturated carboxylic acid

1. malonic acid
2. oxalic acid
3. succinic acid
4. maleic acid

✅ Correct Answer: 4

Which of the following is not a heavy industry?

1. iron
2. fertilizer
3. paper
4. none

✅ Correct Answer: 4

Which of the following is a macronutrient?

1. boron
2. iron
3. copper
4. carbon

✅ Correct Answer: 4

Requirement of macronutrient per acre of the land is

1. 5 to 200 kg
2. 20-200 kg
3. 200-400 kg
4. 30-400 kg

✅ Correct Answer: 1

Three elements needed for the healthy growth of plants are

1. N P K
2. N K C
3. N S P
4. N Ca P

✅ Correct Answer: 1

Which of the following is not a secondary pollutant

1. ozone
2. carbonic acid
3. sulphuric acid
4. carbon dioxide

✅ Correct Answer: 4

Residence time of methane in the atmosphere is

1. 3 - 7 days
2. 2 -3 days
3. 3 - 7 years
4. 2 - 3 years

✅ Correct Answer: 3

Major cause of SO2 on global scale is

1. volcanoes
2. electric sparks
3. combustion
4. all

✅ Correct Answer: 1

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