Free MCQs & Online Quiz Practice for Exams

Q: The coldest region in the atmosphere is

A) Troposphere

B) Stratosphere

C) Mesosphere

D) Thermosphere

Q: Ozone is formed in the presence of ultraviolet radiations from

A) O and O

B) O₂ and O

C) O₂ and O₃

D) N₂ and O₂

Q: The gas(es) responsible for acid rain is/are

A) SO₂

B) NO₂

C) CO₂

D) All of them

Q: On the basis of temperature variation the number of atmospheric regions are:

A) Two

B) Four

C) Five

D) THREE

Q: The gas which protects the earth surface from ultraviolet radiations is

A) CO₂

B) N₂

C) O₃

D) O₂

Q: Lowest temperature in troposphere is

A) 5°C

B) -5°C

C) 56°C

D) -56°C

Q: Which one of the following is a disaccharide?

A) Glucose

B) Fructose

C) Sucrose

D) Starch

Q: A large number of amino acids polymerize into

A) Vitamins

B) Carbohydrates

C) Proteins

D) Lipids

Q: Deficiency of vitamin A causes

A) Scurvy

B) Rickets

C) Night blindness

D) Aging

Q: The compound which is found in every living cell and serves as a centre of information and control is

A) Protein

B) Lipid

C) DNA

D) Glucose

Q: Triglycerides are the building blocks of

A) Protein

B) Carbohydrates

C) Lipids

D) Vitamins

Q: Sugars are polyhydroxy derivatives of

A) Alkyl halides

B) Ketone

C) Aldehyde

D) Aldehyde and Ketone

Q: Peptide linkage is present in

A) Carbohydrates

B) Lipids

C) Proteins

D) Vitamins

Q: Plants convert glucose into

A) Amino acids

B) Lipids

C) Proteins

D) Starch

Q: All are present in DNA except

A) Deoxyribose sugar

B) Ribose sugar

C) Nitrogen base

D) Phosphate unit

Q: Glycogen is an example of

A) Fats

B) Nucleic acids

C) Carbohydrates

D) Protein

Q: The compounds C₆H₁₂ must have

A) All single bonds

B) At least one double bond

C) At least one triple bond

D) All double bonds

Q: Which of the following is an inorganic compound?

A) CH₄

B) CH₃OH

C) NaCN

D) CH₃Cl

Q: Alkyl halide is composed of carbon, hydrogen and

A) Oxygen

B) Nitrogen

C) Halogen

D) SULPHUR

Q: Which of the following is an alcohol?

A) CH₃-O-CH₃

B) CH₃-CH₂-OH

C) CH₃COOH

D) CH₃-COH