Question 1
Permanent hardness of water is due to the presence of:
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Calcium bicarbonate
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Magnesium bicarbonate
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Calcium sulphate
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Sodium bicarbonate
Explanation:
Permanent hardness is caused by sulphates and chlorides of calcium and magnesium, which cannot be removed by boiling.
Question 2
The number of bones in the human body is:
Explanation:
An adult human body contains 206 bones forming the skeletal framework.
Question 3
Which vessel provides blood to the liver?
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Hepatic portal artery
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Veins
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Arteries
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None of these
Explanation:
The liver mainly receives blood through the hepatic portal vein, which is not listed among the options.
Question 4
What is not included in the Earth’s environment?
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Lithosphere
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Stratosphere
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Biosphere
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None of these
Explanation:
All listed components are part of Earth’s environment, so none is excluded.
Question 5
Control rods of which element are used in a nuclear reactor?
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Cadmium
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Copper
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Graphite
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None of these
Explanation:
Cadmium is used in control rods due to its ability to absorb neutrons and regulate nuclear reactions.
Question 6
Which country lies on the equator?
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Kenya
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China
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Bhutan
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El Salvador
Explanation:
Kenya lies along the equator, unlike the other listed countries.
Question 7
What is anthracite?
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Pure carbon
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Hard coal
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Ammonia
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None of these
Explanation:
Anthracite is a high-grade, hard coal with high carbon content and low impurities.
Question 8
How many bits are required to store the hexadecimal word AF?
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2 bits
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4 bits
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8 bits
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12 bits
Explanation:
Each hexadecimal digit represents 4 bits, so two digits (AF) require 8 bits.
Question 9
What is pre-released software’s version?
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Beta
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Alpha
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Gamma
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None of these
Explanation:
Beta versions are pre-release software shared for testing before final release.
Question 10
What organelles do plant cells have?
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Cell wall
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Vacuoles
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Both A and B
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None of these
Explanation:
Plant cells contain both a cell wall for support and vacuoles for storage and regulation.
Question 11
What is the protein metabolism waste in humans?
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Urea
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Ammonia
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Magnesium
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None of these
Explanation:
Urea is the main waste product formed from protein metabolism in humans.
Question 12
Light year is a unit of:
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Light
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Distance
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Depth
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None of these
Explanation:
A light year measures distance, specifically how far light travels in one year.
Question 13
The macronutrients of plants are:
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Nitrogen
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Potassium
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Phosphorus
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All of these
Explanation:
Nitrogen, phosphorus, and potassium are essential macronutrients for plant growth.
Question 14
Atomic number is also called:
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Proton number
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Electron number
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Both A and B
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None of these
Explanation:
Atomic number equals the number of protons in the nucleus of an atom.
Question 15
Which of the following is an example of a warm-blooded animal?
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Reptiles
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Dolphin
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Frog
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All of these
Explanation:
Dolphins are mammals and maintain a constant body temperature, unlike reptiles and amphibians.
Question 16
Blood contains:
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Red blood cells
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White blood cells
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Platelets
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All of these
Explanation:
Blood consists of red cells, white cells, and platelets, each serving essential functions.
Question 17
H⁺ is yielded by:
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Acids
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Alkalis
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Both A and B
-
None of these
Explanation:
Acids release hydrogen ions (H⁺) in aqueous solutions.
Question 18
The unavailability of internal energy for conversion into mechanical work is called:
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Entropy
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Thermodynamics
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Negentropy
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None of these
Explanation:
Entropy represents the portion of energy that cannot be used to perform work.
Question 19
A bronze medal is made up of which metals?
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Copper, nickel
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Copper, tin
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Copper, silver
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None of these
Explanation:
Bronze is an alloy primarily composed of copper and tin.
Question 20
The loudness of sound depends on its:
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Wavelength
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Frequency
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Amplitude
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None of these
Explanation:
Loudness is determined by amplitude, with greater amplitude producing louder sound.