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Science MCQ Questions & Answers

Science MCQs : This section focuses on the "Science". These Multiple Choice Questions (MCQs) should be practiced to improve the Science skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

Question 1

The layer of air around the earth is known as

A. Troposphere
B. Ionosphere
C. Atmosphere
D. Ozone layer

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Question 2

Taxonomic studies depends on

A. Ecological information of organisms
B. Structure of cell and development process of organisms
C. External and internal structure of organisms
D. All of the above

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Question 3

Myopia and hypermetropia can be corrected by

A. Concave and plano-convex lens
B. Concave and convex lens
C. Convex and concave lens
D. Plano-concave lens for both defects

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Question 4

Environmental Science is the study of

A. Geography
B. Physics
C. Biology
D. All of the above

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Question 5

At what temperature is gypsum heated to form Plaster of Paris?

A. 90°C
B. 100°C
C. 110°C
D. 120°C

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Question 6

The study of fish culture is called

A. ophiology
B. herpetology
C. ichthyology
D. pisciculture

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Question 7

The blue color of the clear sky is due to

A. Diffraction of light
B. Dispersion of light
C. Reflection of light
D. Refraction of light

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Question 8

Amalgam is an alloy of

A. Copper and Tin
B. Mercury
C. Lead and Tin
D. Copper and Zinc

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Question 9

Hyoid is a

A. cavity
B. cartilage
C. bone
D. fluid

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Question 10

The longest cell in human body is

A. red blood cells
B. white blood cells
C. columnar epithelial cells
D. nerve cells

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Question 11

Dead organisms are transformed into petroleum and natural gas in

A. presence of air
B. absence of air
C. presence of sunlight
D. none of the above

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Question 12

Soil erosion can be prevented by

A. Removal of vegetation
B. Overgrazing
C. Afforestation
D. Increasing bird population

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Question 13

Entomology is the science that studies

A. Insects
B. Behavior of Human being's
C. Scientific Names
D. Formation of Rocks

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Question 14

Combustion reactions are always

A. Exothermic
B. Endothermic
C. Sometimes exothermic
D. Both (A) and (B)

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Question 15

What is gastric acid present in the stomach composed of?

A. Hydrochloric acid
B. Sulphuric acid
C. Nitric acid
D. Lactic acid

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Question 16

Fuse Wire is Made of?

A. An alloy of Tin and Lead
B. Nickel
C. Copper
D. An alloy of Nickel and Lead

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Question 17

When a gas is turned into a liquid, the process is called

A. Condensation
B. Evaporation
C. Deposition
D. Sublimation

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Question 18

What is the first step in the refining of petroleum?

A. Distillation
B. Cooling
C. Drilling
D. Cracking

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Question 19

The first stage in the formation of coal is

A. Lignite
B. Bituminous
C. Anthracite
D. Peat

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Question 20

A system which gets a continuous flow of energy is called

A. micropropagated system
B. closed system
C. open system
D. steady state

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Question 21

The gas usually filled in the electric bulb is

A. Hydrogen
B. Oxygen
C. Nitrogen
D. Carbon dioxide

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Question 22

The first synthetic fiber made by man was ____ ?

A. Rayon
B. Terrycot
C. Polyester
D. Nylon

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Question 23

What is the scientific name for washing soda?

A. Sodium carbonate
B. Sodium bicarbonate
C. Calcium carbonate
D. Calcium bicarbonate

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Question 24

The Ozone Layer restricts from

A. Infrared Rays
B. Radio waves
C. Ultraviolet Radiation
D. X-Rays and Gamma Rays

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Question 25

Sodium carbonate is a basic salt because it is a salt of

A. strong acid and strong base
B. weak acid and weak base
C. strong acid and weak base
D. weak acid and strong base

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Question 26

The most abundant metal in the earth’s crust is

A. Iron
B. Aluminium
C. Calcium
D. Sodium

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Question 27

Plasmolysis occurs due to

A. Absorption
B. Endosmosis
C. Osmosis
D. Exosmosis

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Question 28

Farmers neutralize the effect of acidity of the soil by adding

A. slaked lime
B. gypsum
C. caustic soda
D. baking soda

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Question 29

One of the constituents of baking powder is sodium hydrogen carbonate, the other constituent is

A. hydrochloric acid
B. tartaric acid
C. acetic acid
D. sulphuric acid

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Question 30

What happens when a solution of an acid is mixed with a solution of a base in a test tube?

A. Temperature of the solution decreases
B. Temperature of the solution increases
C. Temperature of the solution remains the same
D. Salt formation takes place

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Question 31

Wind is caused due to

A. uneven heating of earth’s surface
B. rotation of earth
C. local conditions
D. All of these

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Question 32

Tomato is a natural source of which acid?

A. Acetic acid
B. Citric acid
C. Tartaric acid
D. Oxalic acid

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Question 33

The radioactive element most commonly detected in humans is

A. potassium-40
B. cobalt-60
C. iodine-131
D. plutonium-238

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Question 34

Hypnology is the study of

A. Blood
B. Nerves
C. Sleep
D. Disease

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Question 35

The image formed on the retina of the human eye is

A. virtual and inverted
B. real and inverted
C. real and erect
D. virtual and erect

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