Free MCQs with Answers | Military Brat Defence Academy

QID #24968 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Hard

Choose the option that accurately represents Corrosion.

Correct Answer: D. is gradual deterioration of a material through chemical reactions
Corrosion is gradual deterioration of a material through chemical reactions. The other choices describe different concepts.

Question: Choose the option that accurately represents Corrosion.

A. forms through electrostatic attraction between oppositely charged ions

B. involves sharing of electron pairs between atoms

C. has the same proton number but a different neutron number

D. is gradual deterioration of a material through chemical reactions

Correct Answer: D. is gradual deterioration of a material through chemical reactionsExplanation: Corrosion is gradual deterioration of a material through chemical reactions. The other choices describe different concepts.

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QID #24967 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Hard

Choose the option that accurately represents Hard water.

Correct Answer: C. contains appreciable dissolved calcium or magnesium ions
Hard water contains appreciable dissolved calcium or magnesium ions. The other choices describe different concepts.

Question: Choose the option that accurately represents Hard water.

A. equals the number of protons in an atomic nucleus

B. contains elements chemically combined in fixed proportions

C. contains appreciable dissolved calcium or magnesium ions

D. contains substances physically combined in variable proportions

Correct Answer: C. contains appreciable dissolved calcium or magnesium ionsExplanation: Hard water contains appreciable dissolved calcium or magnesium ions. The other choices describe different concepts.

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QID #24966 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Hard

Choose the option that accurately represents Alloy.

Correct Answer: B. is a metallic material containing more than one element
Alloy is a metallic material containing more than one element. The other choices describe different concepts.

Question: Choose the option that accurately represents Alloy.

A. is gradual deterioration of a material through chemical reactions

B. is a metallic material containing more than one element

C. is the smallest unit retaining the chemical identity of an element

D. contains atoms with the same atomic number

Correct Answer: B. is a metallic material containing more than one elementExplanation: Alloy is a metallic material containing more than one element. The other choices describe different concepts.

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QID #24965 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Hard

Choose the option that accurately represents Polymer.

Correct Answer: A. is a macromolecule built from repeating monomer units
Polymer is a macromolecule built from repeating monomer units. The other choices describe different concepts.

Question: Choose the option that accurately represents Polymer.

A. is a macromolecule built from repeating monomer units

B. is a metallic material containing more than one element

C. contains appreciable dissolved calcium or magnesium ions

D. uses electric current to drive a non-spontaneous chemical change

Correct Answer: A. is a macromolecule built from repeating monomer unitsExplanation: Polymer is a macromolecule built from repeating monomer units. The other choices describe different concepts.

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QID #24964 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Hard

Choose the option that accurately represents Electrolysis.

Correct Answer: D. uses electric current to drive a non-spontaneous chemical change
Electrolysis uses electric current to drive a non-spontaneous chemical change. The other choices describe different concepts.

Question: Choose the option that accurately represents Electrolysis.

A. involves gain of electrons or decrease in oxidation state

B. changes reaction rate without being consumed overall

C. involves loss of electrons or increase in oxidation state

D. uses electric current to drive a non-spontaneous chemical change

Correct Answer: D. uses electric current to drive a non-spontaneous chemical changeExplanation: Electrolysis uses electric current to drive a non-spontaneous chemical change. The other choices describe different concepts.

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QID #24963 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Hard

Choose the option that accurately represents Catalyst.

Correct Answer: C. changes reaction rate without being consumed overall
Catalyst changes reaction rate without being consumed overall. The other choices describe different concepts.

Question: Choose the option that accurately represents Catalyst.

A. is reaction of an acid with a base to form salt and water

B. accepts protons or increases hydroxide-ion concentration in water

C. changes reaction rate without being consumed overall

D. is a logarithmic measure related to hydrogen-ion activity

Correct Answer: C. changes reaction rate without being consumed overallExplanation: Catalyst changes reaction rate without being consumed overall. The other choices describe different concepts.

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QID #24962 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Hard

Choose the option that accurately represents Reduction.

Correct Answer: B. involves gain of electrons or decrease in oxidation state
Reduction involves gain of electrons or decrease in oxidation state. The other choices describe different concepts.

Question: Choose the option that accurately represents Reduction.

A. forms through electrostatic attraction between oppositely charged ions

B. involves gain of electrons or decrease in oxidation state

C. involves sharing of electron pairs between atoms

D. donates protons or increases hydrogen-ion concentration in water

Correct Answer: B. involves gain of electrons or decrease in oxidation stateExplanation: Reduction involves gain of electrons or decrease in oxidation state. The other choices describe different concepts.

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QID #24961 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Hard

Choose the option that accurately represents Oxidation.

Correct Answer: A. involves loss of electrons or increase in oxidation state
Oxidation involves loss of electrons or increase in oxidation state. The other choices describe different concepts.

Question: Choose the option that accurately represents Oxidation.

A. involves loss of electrons or increase in oxidation state

B. equals the number of protons in an atomic nucleus

C. has the same proton number but a different neutron number

D. contains substances physically combined in variable proportions

Correct Answer: A. involves loss of electrons or increase in oxidation stateExplanation: Oxidation involves loss of electrons or increase in oxidation state. The other choices describe different concepts.

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QID #24960 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Hard

Choose the option that accurately represents Neutralization.

Correct Answer: D. is reaction of an acid with a base to form salt and water
Neutralization is reaction of an acid with a base to form salt and water. The other choices describe different concepts.

Question: Choose the option that accurately represents Neutralization.

A. contains atoms with the same atomic number

B. contains elements chemically combined in fixed proportions

C. is the smallest unit retaining the chemical identity of an element

D. is reaction of an acid with a base to form salt and water

Correct Answer: D. is reaction of an acid with a base to form salt and waterExplanation: Neutralization is reaction of an acid with a base to form salt and water. The other choices describe different concepts.

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QID #24959 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Hard

Choose the option that accurately represents pH.

Correct Answer: C. is a logarithmic measure related to hydrogen-ion activity
pH is a logarithmic measure related to hydrogen-ion activity. The other choices describe different concepts.

Question: Choose the option that accurately represents pH.

A. is gradual deterioration of a material through chemical reactions

B. is a metallic material containing more than one element

C. is a logarithmic measure related to hydrogen-ion activity

D. contains appreciable dissolved calcium or magnesium ions

Correct Answer: C. is a logarithmic measure related to hydrogen-ion activityExplanation: pH is a logarithmic measure related to hydrogen-ion activity. The other choices describe different concepts.

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QID #24958 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Hard

Choose the option that accurately represents Base.

Correct Answer: B. accepts protons or increases hydroxide-ion concentration in water
Base accepts protons or increases hydroxide-ion concentration in water. The other choices describe different concepts.

Question: Choose the option that accurately represents Base.

A. changes reaction rate without being consumed overall

B. accepts protons or increases hydroxide-ion concentration in water

C. uses electric current to drive a non-spontaneous chemical change

D. is a macromolecule built from repeating monomer units

Correct Answer: B. accepts protons or increases hydroxide-ion concentration in waterExplanation: Base accepts protons or increases hydroxide-ion concentration in water. The other choices describe different concepts.

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QID #24957 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Hard

Choose the option that accurately represents Acid.

Correct Answer: A. donates protons or increases hydrogen-ion concentration in water
Acid donates protons or increases hydrogen-ion concentration in water. The other choices describe different concepts.

Question: Choose the option that accurately represents Acid.

A. donates protons or increases hydrogen-ion concentration in water

B. involves loss of electrons or increase in oxidation state

C. involves gain of electrons or decrease in oxidation state

D. is reaction of an acid with a base to form salt and water

Correct Answer: A. donates protons or increases hydrogen-ion concentration in waterExplanation: Acid donates protons or increases hydrogen-ion concentration in water. The other choices describe different concepts.

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QID #24956 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Hard

Choose the option that accurately represents Covalent bond.

Correct Answer: D. involves sharing of electron pairs between atoms
Covalent bond involves sharing of electron pairs between atoms. The other choices describe different concepts.

Question: Choose the option that accurately represents Covalent bond.

A. accepts protons or increases hydroxide-ion concentration in water

B. is a logarithmic measure related to hydrogen-ion activity

C. donates protons or increases hydrogen-ion concentration in water

D. involves sharing of electron pairs between atoms

Correct Answer: D. involves sharing of electron pairs between atomsExplanation: Covalent bond involves sharing of electron pairs between atoms. The other choices describe different concepts.

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QID #24955 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Hard

Choose the option that accurately represents Ionic bond.

Correct Answer: C. forms through electrostatic attraction between oppositely charged ions
Ionic bond forms through electrostatic attraction between oppositely charged ions. The other choices describe different concepts.

Question: Choose the option that accurately represents Ionic bond.

A. involves sharing of electron pairs between atoms

B. equals the number of protons in an atomic nucleus

C. forms through electrostatic attraction between oppositely charged ions

D. has the same proton number but a different neutron number

Correct Answer: C. forms through electrostatic attraction between oppositely charged ionsExplanation: Ionic bond forms through electrostatic attraction between oppositely charged ions. The other choices describe different concepts.

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QID #24954 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Hard

Choose the option that accurately represents Isotope.

Correct Answer: B. has the same proton number but a different neutron number
Isotope has the same proton number but a different neutron number. The other choices describe different concepts.

Question: Choose the option that accurately represents Isotope.

A. contains atoms with the same atomic number

B. has the same proton number but a different neutron number

C. contains elements chemically combined in fixed proportions

D. contains substances physically combined in variable proportions

Correct Answer: B. has the same proton number but a different neutron numberExplanation: Isotope has the same proton number but a different neutron number. The other choices describe different concepts.

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QID #24953 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Hard

Choose the option that accurately represents Atomic number.

Correct Answer: A. equals the number of protons in an atomic nucleus
Atomic number equals the number of protons in an atomic nucleus. The other choices describe different concepts.

Question: Choose the option that accurately represents Atomic number.

A. equals the number of protons in an atomic nucleus

B. is gradual deterioration of a material through chemical reactions

C. is the smallest unit retaining the chemical identity of an element

D. contains appreciable dissolved calcium or magnesium ions

Correct Answer: A. equals the number of protons in an atomic nucleusExplanation: Atomic number equals the number of protons in an atomic nucleus. The other choices describe different concepts.

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QID #24952 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Hard

Choose the option that accurately represents Mixture.

Correct Answer: D. contains substances physically combined in variable proportions
Mixture contains substances physically combined in variable proportions. The other choices describe different concepts.

Question: Choose the option that accurately represents Mixture.

A. is a macromolecule built from repeating monomer units

B. is a metallic material containing more than one element

C. uses electric current to drive a non-spontaneous chemical change

D. contains substances physically combined in variable proportions

Correct Answer: D. contains substances physically combined in variable proportionsExplanation: Mixture contains substances physically combined in variable proportions. The other choices describe different concepts.

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QID #24951 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Hard

Choose the option that accurately represents Compound.

Correct Answer: C. contains elements chemically combined in fixed proportions
Compound contains elements chemically combined in fixed proportions. The other choices describe different concepts.

Question: Choose the option that accurately represents Compound.

A. changes reaction rate without being consumed overall

B. involves loss of electrons or increase in oxidation state

C. contains elements chemically combined in fixed proportions

D. involves gain of electrons or decrease in oxidation state

Correct Answer: C. contains elements chemically combined in fixed proportionsExplanation: Compound contains elements chemically combined in fixed proportions. The other choices describe different concepts.

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QID #24950 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Hard

Choose the option that accurately represents Element.

Correct Answer: B. contains atoms with the same atomic number
Element contains atoms with the same atomic number. The other choices describe different concepts.

Question: Choose the option that accurately represents Element.

A. accepts protons or increases hydroxide-ion concentration in water

B. contains atoms with the same atomic number

C. is a logarithmic measure related to hydrogen-ion activity

D. is reaction of an acid with a base to form salt and water

Correct Answer: B. contains atoms with the same atomic numberExplanation: Element contains atoms with the same atomic number. The other choices describe different concepts.

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QID #24949 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Hard

Choose the option that accurately represents Atom.

Correct Answer: A. is the smallest unit retaining the chemical identity of an element
Atom is the smallest unit retaining the chemical identity of an element. The other choices describe different concepts.

Question: Choose the option that accurately represents Atom.

A. is the smallest unit retaining the chemical identity of an element

B. involves sharing of electron pairs between atoms

C. donates protons or increases hydrogen-ion concentration in water

D. forms through electrostatic attraction between oppositely charged ions

Correct Answer: A. is the smallest unit retaining the chemical identity of an elementExplanation: Atom is the smallest unit retaining the chemical identity of an element. The other choices describe different concepts.

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Free MCQs with Answers | Military Brat Defence Academy

Choose the option that accurately represents Corrosion.

Choose the option that accurately represents Hard water.

Choose the option that accurately represents Alloy.

Choose the option that accurately represents Polymer.

Choose the option that accurately represents Electrolysis.

Choose the option that accurately represents Catalyst.

Choose the option that accurately represents Reduction.

Choose the option that accurately represents Oxidation.

Choose the option that accurately represents Neutralization.

Choose the option that accurately represents pH.

Choose the option that accurately represents Base.

Choose the option that accurately represents Acid.

Choose the option that accurately represents Covalent bond.

Choose the option that accurately represents Ionic bond.

Choose the option that accurately represents Isotope.

Choose the option that accurately represents Atomic number.

Choose the option that accurately represents Mixture.

Choose the option that accurately represents Compound.

Choose the option that accurately represents Element.

Choose the option that accurately represents Atom.

Free MCQs with Answers and Explanations