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

QID #24898 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Medium

In Chemistry, which description is associated with Base?

Correct Answer: C. 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: In Chemistry, which description is associated with Base?

A. contains elements chemically combined in fixed proportions

B. contains substances physically combined in variable proportions

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

D. contains atoms with the same atomic number

Correct Answer: C. 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 #24897 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Medium

In Chemistry, which description is associated with Acid?

Correct Answer: B. 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: In Chemistry, which description is associated with Acid?

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

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

C. contains appreciable dissolved calcium or magnesium ions

D. is gradual deterioration of a material through chemical reactions

Correct Answer: B. 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 #24896 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Medium

In Chemistry, which description is associated with Covalent bond?

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

Question: In Chemistry, which description is associated with Covalent bond?

A. involves sharing of electron pairs between atoms

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

C. is a macromolecule built from repeating monomer units

D. is a metallic material containing more than one element

Correct Answer: A. 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 #24895 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Medium

In Chemistry, which description is associated with Ionic bond?

Correct Answer: D. 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: In Chemistry, which description is associated with Ionic bond?

A. involves loss of electrons or increase in oxidation state

B. involves gain of electrons or decrease in oxidation state

C. changes reaction rate without being consumed overall

D. forms through electrostatic attraction between oppositely charged ions

Correct Answer: D. 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 #24894 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Medium

In Chemistry, which description is associated with Isotope?

Correct Answer: C. 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: In Chemistry, which description is associated with Isotope?

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

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

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

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

Correct Answer: C. 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 #24893 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Medium

In Chemistry, which description is associated with Atomic number?

Correct Answer: B. 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: In Chemistry, which description is associated with Atomic number?

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

B. equals the number of protons in an atomic nucleus

C. forms through electrostatic attraction between oppositely charged ions

D. involves sharing of electron pairs between atoms

Correct Answer: B. 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 #24892 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Medium

In Chemistry, which description is associated with Mixture?

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

Question: In Chemistry, which description is associated with Mixture?

A. contains substances physically combined in variable proportions

B. contains elements chemically combined in fixed proportions

C. equals the number of protons in an atomic nucleus

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

Correct Answer: A. 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 #24891 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Medium

In Chemistry, which description is associated with Compound?

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

Question: In Chemistry, which description is associated with Compound?

A. is gradual deterioration of a material through chemical reactions

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

C. contains atoms with the same atomic number

D. contains elements chemically combined in fixed proportions

Correct Answer: D. 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 #24890 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Medium

In Chemistry, which description is associated with Element?

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

Question: In Chemistry, which description is associated with Element?

A. is a metallic material containing more than one element

B. contains appreciable dissolved calcium or magnesium ions

C. contains atoms with the same atomic number

D. is a macromolecule built from repeating monomer units

Correct Answer: C. 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 #24889 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Medium

In Chemistry, which description is associated with Atom?

Correct Answer: B. 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: In Chemistry, which description is associated with Atom?

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

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

C. involves gain of electrons or decrease in oxidation state

D. changes reaction rate without being consumed overall

Correct Answer: B. 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 #24888 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series 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 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 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 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 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 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 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 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 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 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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UPPSC Health Education Officer (HEO) 2026 Mock Test Series with Answers | Military Brat Defence Academy

In Chemistry, which description is associated with Base?

In Chemistry, which description is associated with Acid?

In Chemistry, which description is associated with Covalent bond?

In Chemistry, which description is associated with Ionic bond?

In Chemistry, which description is associated with Isotope?

In Chemistry, which description is associated with Atomic number?

In Chemistry, which description is associated with Mixture?

In Chemistry, which description is associated with Compound?

In Chemistry, which description is associated with Element?

In Chemistry, which description is associated with Atom?

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?

Free MCQs with Answers and Explanations