Free MCQs with Answers | Military Brat Defence Academy

QID #24888 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Easy

Which pair involving Corrosion is correctly matched?

Correct Answer: C. Corrosion — 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: Which pair involving Corrosion is correctly matched?

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

B. pH — donates protons or increases hydrogen-ion concentration in water

C. Corrosion — is gradual deterioration of a material through chemical reactions

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

Correct Answer: C. Corrosion — 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 #24887 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Easy

Which pair involving Hard water is correctly matched?

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

Question: Which pair involving Hard water is correctly matched?

A. Covalent bond — has the same proton number but a different neutron number

B. Hard water — contains appreciable dissolved calcium or magnesium ions

C. Isotope — forms through electrostatic attraction between oppositely charged ions

D. Ionic bond — involves sharing of electron pairs between atoms

Correct Answer: B. Hard water — 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 #24886 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Easy

Which pair involving Alloy is correctly matched?

Correct Answer: A. Alloy — 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: Which pair involving Alloy is correctly matched?

A. Alloy — is a metallic material containing more than one element

B. Compound — contains substances physically combined in variable proportions

C. Mixture — equals the number of protons in an atomic nucleus

D. Atomic number — contains elements chemically combined in fixed proportions

Correct Answer: A. Alloy — 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 #24885 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Easy

Which pair involving Polymer is correctly matched?

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

Question: Which pair involving Polymer is correctly matched?

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

B. Atom — contains atoms with the same atomic number

C. Element — is gradual deterioration of a material through chemical reactions

D. Polymer — is a macromolecule built from repeating monomer units

Correct Answer: D. Polymer — 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 #24884 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Easy

Which pair involving Electrolysis is correctly matched?

Correct Answer: C. Electrolysis — 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: Which pair involving Electrolysis is correctly matched?

A. Alloy — contains appreciable dissolved calcium or magnesium ions

B. Hard water — is a macromolecule built from repeating monomer units

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

D. Polymer — is a metallic material containing more than one element

Correct Answer: C. Electrolysis — 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 #24883 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Easy

Which pair involving Catalyst is correctly matched?

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

Question: Which pair involving Catalyst is correctly matched?

A. Electrolysis — involves loss of electrons or increase in oxidation state

B. Catalyst — changes reaction rate without being consumed overall

C. Oxidation — involves gain of electrons or decrease in oxidation state

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

Correct Answer: B. Catalyst — 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 #24882 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Easy

Which pair involving Reduction is correctly matched?

Correct Answer: A. Reduction — 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: Which pair involving Reduction is correctly matched?

A. Reduction — involves gain of electrons or decrease in oxidation state

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

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

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

Correct Answer: A. Reduction — 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 #24881 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Easy

Which pair involving Oxidation is correctly matched?

Correct Answer: D. Oxidation — 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: Which pair involving Oxidation is correctly matched?

A. Ionic bond — involves sharing of electron pairs between atoms

B. Covalent bond — donates protons or increases hydrogen-ion concentration in water

C. Acid — forms through electrostatic attraction between oppositely charged ions

D. Oxidation — involves loss of electrons or increase in oxidation state

Correct Answer: D. Oxidation — 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 #24880 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Easy

Which pair involving Neutralization is correctly matched?

Correct Answer: C. Neutralization — 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: Which pair involving Neutralization is correctly matched?

A. Atomic number — has the same proton number but a different neutron number

B. Isotope — contains substances physically combined in variable proportions

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

D. Mixture — equals the number of protons in an atomic nucleus

Correct Answer: C. Neutralization — 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 #24879 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Easy

Which pair involving pH is correctly matched?

Correct Answer: B. pH — 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: Which pair involving pH is correctly matched?

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

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

C. Atom — contains atoms with the same atomic number

D. Element — contains elements chemically combined in fixed proportions

Correct Answer: B. pH — 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 #24878 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Easy

Which pair involving Base is correctly matched?

Correct Answer: A. Base — 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: Which pair involving Base is correctly matched?

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

B. Alloy — contains appreciable dissolved calcium or magnesium ions

C. Hard water — is gradual deterioration of a material through chemical reactions

D. Corrosion — is a metallic material containing more than one element

Correct Answer: A. Base — 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 #24877 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Easy

Which pair involving Acid is correctly matched?

Correct Answer: D. Acid — 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: Which pair involving Acid is correctly matched?

A. Catalyst — uses electric current to drive a non-spontaneous chemical change

B. Electrolysis — is a macromolecule built from repeating monomer units

C. Polymer — changes reaction rate without being consumed overall

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

Correct Answer: D. Acid — 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 #24876 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Easy

Which pair involving Covalent bond is correctly matched?

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

Question: Which pair involving Covalent bond is correctly matched?

A. Oxidation — involves gain of electrons or decrease in oxidation state

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

C. Covalent bond — involves sharing of electron pairs between atoms

D. Neutralization — involves loss of electrons or increase in oxidation state

Correct Answer: C. Covalent bond — 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 #24875 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Easy

Which pair involving Ionic bond is correctly matched?

Correct Answer: B. Ionic bond — 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: Which pair involving Ionic bond is correctly matched?

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

B. Ionic bond — forms through electrostatic attraction between oppositely charged ions

C. Acid — accepts protons or increases hydroxide-ion concentration in water

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

Correct Answer: B. Ionic bond — 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 #24874 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Easy

Which pair involving Isotope is correctly matched?

Correct Answer: A. Isotope — 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: Which pair involving Isotope is correctly matched?

A. Isotope — has the same proton number but a different neutron number

B. Atomic number — forms through electrostatic attraction between oppositely charged ions

C. Ionic bond — involves sharing of electron pairs between atoms

D. Covalent bond — equals the number of protons in an atomic nucleus

Correct Answer: A. Isotope — 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 #24873 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Easy

Which pair involving Atomic number is correctly matched?

Correct Answer: D. Atomic number — 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: Which pair involving Atomic number is correctly matched?

A. Element — contains elements chemically combined in fixed proportions

B. Compound — contains substances physically combined in variable proportions

C. Mixture — contains atoms with the same atomic number

D. Atomic number — equals the number of protons in an atomic nucleus

Correct Answer: D. Atomic number — 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 #24872 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Easy

Which pair involving Mixture is correctly matched?

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

Question: Which pair involving Mixture is correctly matched?

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

B. Atom — contains appreciable dissolved calcium or magnesium ions

C. Mixture — contains substances physically combined in variable proportions

D. Hard water — is gradual deterioration of a material through chemical reactions

Correct Answer: C. Mixture — 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 #24871 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Easy

Which pair involving Compound is correctly matched?

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

Question: Which pair involving Compound is correctly matched?

A. Alloy — uses electric current to drive a non-spontaneous chemical change

B. Compound — contains elements chemically combined in fixed proportions

C. Electrolysis — is a macromolecule built from repeating monomer units

D. Polymer — is a metallic material containing more than one element

Correct Answer: B. Compound — 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 #24870 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Easy

Which pair involving Element is correctly matched?

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

Question: Which pair involving Element is correctly matched?

A. Element — contains atoms with the same atomic number

B. Oxidation — involves gain of electrons or decrease in oxidation state

C. Reduction — changes reaction rate without being consumed overall

D. Catalyst — involves loss of electrons or increase in oxidation state

Correct Answer: A. Element — 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 #24869 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Easy

Which pair involving Atom is correctly matched?

Correct Answer: D. Atom — 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: Which pair involving Atom is correctly matched?

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

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

C. Neutralization — accepts protons or increases hydroxide-ion concentration in water

D. Atom — is the smallest unit retaining the chemical identity of an element

Correct Answer: D. Atom — 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

Which pair involving Corrosion is correctly matched?

Which pair involving Hard water is correctly matched?

Which pair involving Alloy is correctly matched?

Which pair involving Polymer is correctly matched?

Which pair involving Electrolysis is correctly matched?

Which pair involving Catalyst is correctly matched?

Which pair involving Reduction is correctly matched?

Which pair involving Oxidation is correctly matched?

Which pair involving Neutralization is correctly matched?

Which pair involving pH is correctly matched?

Which pair involving Base is correctly matched?

Which pair involving Acid is correctly matched?

Which pair involving Covalent bond is correctly matched?

Which pair involving Ionic bond is correctly matched?

Which pair involving Isotope is correctly matched?

Which pair involving Atomic number is correctly matched?

Which pair involving Mixture is correctly matched?

Which pair involving Compound is correctly matched?

Which pair involving Element is correctly matched?

Which pair involving Atom is correctly matched?

Free MCQs with Answers and Explanations