An undesirable change in the characteristics of air, water and land environment that is harmful to humans and living things is known as...? Mcqs

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An undesirable change in the characteristics of air, water and land environment that is harmful to humans and living things is known as...?

(A) Pollutant
(B) Pollution

(C) Climate Change
(D) Global Warning

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Magnalium is an alloy of_____________...?

(A) Magnesium and Lead
(B) Aluminium and Zinc

(C) Aluminium and Magnesium
(D) Aluminium and Mercury

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The electricity we used in our homes and schools is called...?

(A) Electric Potential (EP)
(B) Electric Resistance (ER)

(C) Direct Current (DC)
(D) Alternating Current (AC)

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Enzyme changes in pH can cause enzymes to ______...?

(A) Denature
(B) Activate

(C) Inhibit
(D) Stabilize

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Elements are made of _________...?

(A) Atoms
(B) Molecules

(C) H2O
(D) Compounds

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Ruby is an oxide of__________...?

(A) silver
(B) gold

(C) platinum
(D) aluminium oxide

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Radioactivity was discovered by __________...?

(A) Kelvin
(B) Thomson

(C) Rutherford
(D) Bacquerel

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The citric acid is used in preparation of cold drinks for _____...?

(A) Sweet taste
(B) Bitter taste

(C) Sour taste
(D) Salty taste

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In an atom number of protons and neutrons are added to obtain ________...?

(A) In an atom number of protons and neutrons are added to obtain ________? Number of electrons
(B) Number of nucleons

(C) Atomic number of element
(D) Number of isotopes

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Freezing point of water at Fahrenheit Scale is...?

(A) 0 °F
(B) 212 °F

(C) 32 °F
(D) -32 °F

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