Free MCQs with Answers | Military Brat Defence Academy

QID #24948 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

How is Corrosion best explained?

Correct Answer: B. 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: How is Corrosion best explained?

A. contains elements chemically combined in fixed proportions

B. is gradual deterioration of a material through chemical reactions

C. contains substances physically combined in variable proportions

D. contains atoms with the same atomic number

Correct Answer: B. 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 #24947 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

How is Hard water best explained?

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

Question: How is Hard water best explained?

A. contains appreciable dissolved calcium or magnesium ions

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

C. is a metallic material containing more than one element

D. is gradual deterioration of a material through chemical reactions

Correct Answer: A. 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 #24946 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

How is Alloy best explained?

Correct Answer: D. 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: How is Alloy best explained?

A. is a macromolecule built from repeating monomer units

B. changes reaction rate without being consumed overall

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

D. is a metallic material containing more than one element

Correct Answer: D. 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 #24945 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

How is Polymer best explained?

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

Question: How is Polymer best explained?

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

B. involves loss of electrons or increase in oxidation state

C. is a macromolecule built from repeating monomer units

D. involves gain of electrons or decrease in oxidation state

Correct Answer: C. 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 #24944 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

How is Electrolysis best explained?

Correct Answer: B. 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: How is Electrolysis best explained?

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

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

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

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

Correct Answer: B. 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 #24943 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

How is Catalyst best explained?

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

Question: How is Catalyst best explained?

A. changes reaction rate without being consumed overall

B. involves sharing of electron pairs between atoms

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

D. forms through electrostatic attraction between oppositely charged ions

Correct Answer: A. 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 #24942 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

How is Reduction best explained?

Correct Answer: D. 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: How is Reduction best explained?

A. equals the number of protons in an atomic nucleus

B. contains elements chemically combined in fixed proportions

C. contains substances physically combined in variable proportions

D. involves gain of electrons or decrease in oxidation state

Correct Answer: D. 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 #24941 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

How is Oxidation best explained?

Correct Answer: C. 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: How is Oxidation best explained?

A. is gradual deterioration of a material through chemical reactions

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

C. involves loss of electrons or increase in oxidation state

D. contains atoms with the same atomic number

Correct Answer: C. 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 #24940 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

How is Neutralization best explained?

Correct Answer: B. 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: How is Neutralization best explained?

A. is a metallic material containing more than one element

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

C. contains appreciable dissolved calcium or magnesium ions

D. is a macromolecule built from repeating monomer units

Correct Answer: B. 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 #24939 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

How is pH best explained?

Correct Answer: A. 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: How is pH best explained?

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

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

C. involves gain of electrons or decrease in oxidation state

D. changes reaction rate without being consumed overall

Correct Answer: A. 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 #24938 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

How is Base best explained?

Correct Answer: D. 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: How is Base best explained?

A. involves loss of electrons or increase in oxidation state

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

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

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

Correct Answer: D. 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 #24937 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

How is Acid best explained?

Correct Answer: C. 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: How is Acid best explained?

A. forms through electrostatic attraction between oppositely charged ions

B. involves sharing of electron pairs between atoms

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

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

Correct Answer: C. 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 #24936 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

How is Covalent bond best explained?

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

Question: How is Covalent bond best explained?

A. equals the number of protons in an atomic nucleus

B. involves sharing of electron pairs between atoms

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

D. contains substances physically combined in variable proportions

Correct Answer: B. 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 #24935 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

How is Ionic bond best explained?

Correct Answer: A. 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: How is Ionic bond best explained?

A. forms through electrostatic attraction between oppositely charged ions

B. contains elements chemically combined in fixed proportions

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

D. contains atoms with the same atomic number

Correct Answer: A. 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 #24934 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

How is Isotope best explained?

Correct Answer: D. 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: How is Isotope best explained?

A. is gradual deterioration of a material through chemical reactions

B. is a metallic material containing more than one element

C. contains appreciable dissolved calcium or magnesium ions

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

Correct Answer: D. 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 #24933 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

How is Atomic number best explained?

Correct Answer: C. 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: How is Atomic number best explained?

A. changes reaction rate without being consumed overall

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

C. equals the number of protons in an atomic nucleus

D. is a macromolecule built from repeating monomer units

Correct Answer: C. 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 #24932 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

How is Mixture best explained?

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

Question: How is Mixture best explained?

A. involves loss of electrons or increase in oxidation state

B. contains substances physically combined in variable proportions

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: B. 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 #24931 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

How is Compound best explained?

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

Question: How is Compound best explained?

A. contains elements chemically combined in fixed proportions

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

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

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

Correct Answer: A. 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 #24930 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

How is Element best explained?

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

Question: How is Element best explained?

A. involves sharing of electron pairs between atoms

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

C. forms through electrostatic attraction between oppositely charged ions

D. contains atoms with the same atomic number

Correct Answer: D. 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 #24929 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

How is Atom best explained?

Correct Answer: C. 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: How is Atom best explained?

A. contains elements chemically combined in fixed proportions

B. contains substances physically combined in variable proportions

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

D. equals the number of protons in an atomic nucleus

Correct Answer: C. 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

How is Corrosion best explained?

How is Hard water best explained?

How is Alloy best explained?

How is Polymer best explained?

How is Electrolysis best explained?

How is Catalyst best explained?

How is Reduction best explained?

How is Oxidation best explained?

How is Neutralization best explained?

How is pH best explained?

How is Base best explained?

How is Acid best explained?

How is Covalent bond best explained?

How is Ionic bond best explained?

How is Isotope best explained?

How is Atomic number best explained?

How is Mixture best explained?

How is Compound best explained?

How is Element best explained?

How is Atom best explained?

Free MCQs with Answers and Explanations