Science and Technology MCQs

Static General Knowledge

Science and Technology MCQs

Practice Science and Technology MCQs with answers and detailed explanations covering scientific inventions, technological advancements, space missions, information technology, biotechnology, artificial intelligence, discoveries, innovations and current developments frequently asked in SSC, Railway, Banking, UPSC, JKSSB, Police, Defence, Teaching and other competitive examinations.

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Practice Questions

Page 12 of 24
Question #221
What is the study of the universe known as?
A. Astrology
B. Seismology
C. Cosmology
D. Limnology
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Correct Answer: Option C

Explanation:
Cosmology is the branch of astronomy that involves the origin and evolution of the universe.
This question belongs to: Static General Knowledge Science and Technology
Question #222
Which metal is the most abundant in the Earth's crust?
A. Calcium
B. Aluminum
C. Iron
D. Copper
Discuss
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Correct Answer: Option B

Explanation:
Aluminum is the most abundant metal in the Earth's crust, making up about 8% of the Earth's solid surface.
This question belongs to: Static General Knowledge Science and Technology
Question #223
The 'Greenhouse Effect' is primarily caused by which gas?
A. Carbon Dioxide
B. Nitrogen
C. Hydrogen
D. Oxygen
Discuss
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Correct Answer: Option A

Explanation:
Carbon dioxide traps heat in the Earth's atmosphere, acting like the glass in a greenhouse.
This question belongs to: Static General Knowledge Science and Technology
Question #224
What is the common name for Sodium Bicarbonate?
A. Bleaching Powder
B. Washing Soda
C. Baking Soda
D. Caustic Soda
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Correct Answer: Option C

Explanation:
Sodium Bicarbonate ($NaHCO_3$) is widely known as baking soda.
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Question #225
Which vitamin deficiency causes 'Scurvy'?
A. Vitamin A
B. Vitamin C
C. Vitamin D
D. Vitamin B12
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Correct Answer: Option B

Explanation:
Scurvy is a disease resulting from a severe deficiency of Vitamin C.
This question belongs to: Static General Knowledge Science and Technology
Question #226
What is the SI unit of power?
A. Newton
B. Pascal
C. Watt
D. Joule
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Correct Answer: Option C

Explanation:
The Watt is the SI unit of power, equivalent to one joule per second.
This question belongs to: Static General Knowledge Science and Technology
Question #227
Which of the following is the hardest natural substance on Earth?
A. Iron
B. Diamond
C. Platinum
D. Gold
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Correct Answer: Option B

Explanation:
Diamond is an allotrope of carbon and is the hardest known natural mineral.
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Question #228
Which instrument is used to measure electric current?
A. Potentiometer
B. Ammeter
C. Voltmeter
D. Galvanometer
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Correct Answer: Option B

Explanation:
An ammeter is a measuring instrument used to measure the current in a circuit.
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Question #229
Which chemical element is found in all organic compounds?
A. Nitrogen
B. Oxygen
C. Carbon
D. Sulfur
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Correct Answer: Option C

Explanation:
Organic chemistry is defined as the study of carbon-based compounds.
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Question #230
What is the speed of sound in air at room temperature approximately?
A. 300,000,000 m/s
B. 450 m/s
C. 330 m/s
D. 1500 m/s
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Correct Answer: Option C

Explanation:
The speed of sound in air is approximately 330-343 meters per second at 20°C.
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Question #231
Which part of the cell is called the 'Powerhouse of the Cell'?
A. Golgi body
B. Mitochondria
C. Ribosome
D. Nucleus
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Correct Answer: Option B

Explanation:
Mitochondria generate most of the cell's supply of adenosine triphosphate (ATP), which is used as a source of chemical energy.
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Question #232
Which blood group is known as the 'Universal Donor'?
A. AB+
B. B-
C. O-
D. A+
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Correct Answer: Option C

Explanation:
O-negative blood lacks A, B, and Rh antigens, making it the universal donor.
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Question #233
Which planet in our solar system has the most moons?
A. Uranus
B. Jupiter
C. Saturn
D. Mars
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Correct Answer: Option C

Explanation:
Saturn currently holds the record for the highest number of confirmed moons.
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Question #234
Who proposed the theory of evolution by natural selection?
A. Alfred Russel Wallace
B. Jean-Baptiste Lamarck
C. Gregor Mendel
D. Charles Darwin
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Correct Answer: Option D

Explanation:
Charles Darwin published 'On the Origin of Species' detailing natural selection.
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Question #235
What is the main chemical component of vinegar?
A. Formic acid
B. Citric acid
C. Acetic acid
D. Lactic acid
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Correct Answer: Option C

Explanation:
Vinegar consists mainly of acetic acid (typically 5-8% by volume).
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Question #236
Which of these is a noble gas?
A. Oxygen
B. Hydrogen
C. Neon
D. Nitrogen
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Correct Answer: Option C

Explanation:
Neon is a noble gas, belonging to Group 18 of the periodic table.
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Question #237
What is the study of fossils called?
A. Anthropology
B. Archaeology
C. Geology
D. Paleontology
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Correct Answer: Option D

Explanation:
Paleontology is the study of ancient life through fossils.
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Question #238
Which instrument is used for observing distant objects in space?
A. Kaleidoscope
B. Microscope
C. Periscope
D. Telescope
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Correct Answer: Option D

Explanation:
A telescope is an optical instrument designed to make distant objects appear nearer.
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Question #239
What is the hardest part of the human body?
A. Bone
B. Skull
C. Nails
D. Tooth enamel
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Correct Answer: Option D

Explanation:
Tooth enamel is the most mineralized and hardest substance in the human body.
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Question #240
Which planet is known as the 'Morning Star'?
A. Jupiter
B. Mars
C. Venus
D. Mercury
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Correct Answer: Option C

Explanation:
Venus is often called the Morning Star or Evening Star because it is very bright.
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Select the most appropriate meaning of the idiom: 'Cloud cuckoo land'.
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