UPPSC Health Education Officer (HEO) 2026 Mock Test Series with Answers

QID #24938 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series 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 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 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 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 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 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 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 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 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 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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QID #24928 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series 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 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 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 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 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 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 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 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 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 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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UPPSC Health Education Officer (HEO) 2026 Mock Test Series with Answers | Military Brat Defence Academy

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?

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.

Free MCQs with Answers and Explanations