Free MCQs with Answers | Military Brat Defence Academy

QID #24928 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

Select the accurate statement about Corrosion.

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: Select the accurate statement about Corrosion.

A. is a macromolecule built from repeating monomer units

B. is gradual deterioration of a material through chemical reactions

C. is a metallic material containing more than one element

D. contains appreciable dissolved calcium or magnesium ions

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 #24927 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

Select the accurate statement about Hard water.

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: Select the accurate statement about Hard water.

A. contains appreciable dissolved calcium or magnesium ions

B. changes reaction rate without being consumed overall

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

D. involves gain of electrons or decrease in oxidation state

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 #24926 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

Select the accurate statement about Alloy.

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: Select the accurate statement about Alloy.

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 logarithmic measure related to hydrogen-ion activity

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 #24925 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

Select the accurate statement about Polymer.

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: Select the accurate statement about Polymer.

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

B. involves sharing of electron pairs between atoms

C. is a macromolecule built from repeating monomer units

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

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 #24924 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

Select the accurate statement about Electrolysis.

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: Select the accurate statement about Electrolysis.

A. equals the number of protons in an atomic nucleus

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

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

D. forms through electrostatic attraction between oppositely charged ions

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 #24923 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

Select the accurate statement about Catalyst.

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: Select the accurate statement about Catalyst.

A. changes reaction rate without being consumed overall

B. contains elements chemically combined in fixed proportions

C. contains substances physically combined in variable proportions

D. contains atoms with the same atomic number

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 #24922 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

Select the accurate statement about Reduction.

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: Select the accurate statement about Reduction.

A. is gradual deterioration of a material through chemical reactions

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

C. contains appreciable dissolved calcium or magnesium ions

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 #24921 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

Select the accurate statement about Oxidation.

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: Select the accurate statement about Oxidation.

A. is a metallic material containing more than one element

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

C. involves loss of electrons or increase in oxidation state

D. is a macromolecule built from repeating monomer units

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 #24920 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

Select the accurate statement about Neutralization.

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: Select the accurate statement about Neutralization.

A. involves loss of electrons or increase in oxidation state

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

C. involves gain of electrons or decrease in oxidation state

D. changes reaction rate without being consumed overall

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 #24919 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

Select the accurate statement about pH.

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: Select the accurate statement about pH.

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

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

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

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

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 #24918 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

Select the accurate statement about Base.

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: Select the accurate statement about Base.

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. 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 #24917 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

Select the accurate statement about Acid.

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: Select the accurate statement about Acid.

A. equals the number of protons in an atomic nucleus

B. contains elements chemically combined in fixed proportions

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

D. contains substances physically combined in variable proportions

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 #24916 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

Select the accurate statement about Covalent bond.

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: Select the accurate statement about Covalent bond.

A. is gradual deterioration of a material through chemical reactions

B. involves sharing of electron pairs between atoms

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

D. contains atoms with the same atomic number

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 #24915 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

Select the accurate statement about Ionic bond.

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: Select the accurate statement about Ionic bond.

A. forms through electrostatic attraction between oppositely charged ions

B. is a metallic material containing more than one element

C. contains appreciable dissolved calcium or magnesium ions

D. is a macromolecule built from repeating monomer units

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 #24914 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

Select the accurate statement about Isotope.

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: Select the accurate statement about Isotope.

A. changes reaction rate without being consumed overall

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

C. involves gain of electrons or decrease in oxidation state

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 #24913 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

Select the accurate statement about Atomic number.

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: Select the accurate statement about Atomic number.

A. involves loss of electrons or increase in oxidation state

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

C. equals the number of protons in an atomic nucleus

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

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 #24912 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

Select the accurate statement about Mixture.

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: Select the accurate statement about Mixture.

A. involves sharing of electron pairs between atoms

B. contains substances physically combined in variable proportions

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

D. accepts protons or increases hydroxide-ion concentration in 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 #24911 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

Select the accurate statement about Compound.

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: Select the accurate statement about Compound.

A. contains elements chemically combined in fixed proportions

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

C. forms through electrostatic attraction between oppositely charged ions

D. equals the number of protons in an atomic nucleus

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 #24910 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

Select the accurate statement about Element.

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: Select the accurate statement about Element.

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. 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 #24909 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Medium

Select the accurate statement about Atom.

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: Select the accurate statement about Atom.

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 appreciable dissolved calcium or magnesium ions

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

Select the accurate statement about Corrosion.

Select the accurate statement about Hard water.

Select the accurate statement about Alloy.

Select the accurate statement about Polymer.

Select the accurate statement about Electrolysis.

Select the accurate statement about Catalyst.

Select the accurate statement about Reduction.

Select the accurate statement about Oxidation.

Select the accurate statement about Neutralization.

Select the accurate statement about pH.

Select the accurate statement about Base.

Select the accurate statement about Acid.

Select the accurate statement about Covalent bond.

Select the accurate statement about Ionic bond.

Select the accurate statement about Isotope.

Select the accurate statement about Atomic number.

Select the accurate statement about Mixture.

Select the accurate statement about Compound.

Select the accurate statement about Element.

Select the accurate statement about Atom.

Free MCQs with Answers and Explanations