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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

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 2

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 3

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 4

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 5

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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Question 6

The most abundant metal in the earth’s crust is

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

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Question 7

Amalgam is an alloy of

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

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Question 8

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 9

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 10

The study of fish culture is called

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

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Question 11

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 12

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 13

Plasmolysis occurs due to

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

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Question 14

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 15

Hyoid is a

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

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Question 16

Combustion reactions are always

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

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Question 17

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 18

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 19

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 20

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 21

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 22

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 23

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 24

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 25

The first synthetic fiber made by man was ____ ?

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

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Question 26

The layer of air around the earth is known as

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

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Question 27

What is the first step in the refining of petroleum?

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

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Question 28

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 29

Soil erosion can be prevented by

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

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Question 30

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 31

The first stage in the formation of coal is

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

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Question 32

Environmental Science is the study of

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

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Question 33

Hypnology is the study of

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

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Question 34

The gas usually filled in the electric bulb is

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

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Question 35

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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