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

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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QID #24868 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Easy

Identify the term that is gradual deterioration of a material through chemical reactions.

Correct Answer: D. Corrosion
Corrosion is gradual deterioration of a material through chemical reactions. The other choices describe different concepts.

Question: Identify the term that is gradual deterioration of a material through chemical reactions.

A. Atomic number

B. Isotope

C. Ionic bond

D. Corrosion

Correct Answer: D. CorrosionExplanation: Corrosion is gradual deterioration of a material through chemical reactions. The other choices describe different concepts.

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QID #24867 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Easy

Identify the term that contains appreciable dissolved calcium or magnesium ions.

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

Question: Identify the term that contains appreciable dissolved calcium or magnesium ions.

A. Compound

B. Mixture

C. Hard water

D. Element

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

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QID #24866 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Easy

Identify the term that is a metallic material containing more than one element.

Correct Answer: B. Alloy
Alloy is a metallic material containing more than one element. The other choices describe different concepts.

Question: Identify the term that is a metallic material containing more than one element.

A. Atom

B. Alloy

C. Hard water

D. Corrosion

Correct Answer: B. AlloyExplanation: Alloy is a metallic material containing more than one element. The other choices describe different concepts.

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QID #24865 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Easy

Identify the term that is a macromolecule built from repeating monomer units. Choose the best answer for Test 13.

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

Question: Identify the term that is a macromolecule built from repeating monomer units. Choose the best answer for Test 13.

A. Polymer

B. Catalyst

C. Electrolysis

D. Alloy

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

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QID #24864 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Easy

Identify the term that uses electric current to drive a non-spontaneous chemical change. Choose the best answer for Test 13.

Correct Answer: D. Electrolysis
Electrolysis uses electric current to drive a non-spontaneous chemical change. The other choices describe different concepts.

Question: Identify the term that uses electric current to drive a non-spontaneous chemical change. Choose the best answer for Test 13.

A. Neutralization

B. Oxidation

C. Reduction

D. Electrolysis

Correct Answer: D. ElectrolysisExplanation: Electrolysis uses electric current to drive a non-spontaneous chemical change. The other choices describe different concepts.

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QID #24863 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Easy

Identify the term that changes reaction rate without being consumed overall.

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

Question: Identify the term that changes reaction rate without being consumed overall.

A. Base

B. pH

C. Catalyst

D. Acid

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

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QID #24862 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Easy

Identify the term that involves gain of electrons or decrease in oxidation state.

Correct Answer: B. Reduction
Reduction involves gain of electrons or decrease in oxidation state. The other choices describe different concepts.

Question: Identify the term that involves gain of electrons or decrease in oxidation state.

A. Covalent bond

B. Reduction

C. Isotope

D. Ionic bond

Correct Answer: B. ReductionExplanation: Reduction involves gain of electrons or decrease in oxidation state. The other choices describe different concepts.

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QID #24861 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Easy

Identify the term that involves loss of electrons or increase in oxidation state.

Correct Answer: A. Oxidation
Oxidation involves loss of electrons or increase in oxidation state. The other choices describe different concepts.

Question: Identify the term that involves loss of electrons or increase in oxidation state.

A. Oxidation

B. Compound

C. Mixture

D. Atomic number

Correct Answer: A. OxidationExplanation: Oxidation involves loss of electrons or increase in oxidation state. The other choices describe different concepts.

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QID #24860 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Easy

Identify the term that is reaction of an acid with a base to form salt and water.

Correct Answer: D. Neutralization
Neutralization is reaction of an acid with a base to form salt and water. The other choices describe different concepts.

Question: Identify the term that is reaction of an acid with a base to form salt and water.

A. Corrosion

B. Atom

C. Element

D. Neutralization

Correct Answer: D. NeutralizationExplanation: 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 #24859 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series Bilingual General Science Chemistry Easy

Identify the term that is a logarithmic measure related to hydrogen-ion activity. Choose the best answer for Test 13.

Correct Answer: C. pH
pH is a logarithmic measure related to hydrogen-ion activity. The other choices describe different concepts.

Question: Identify the term that is a logarithmic measure related to hydrogen-ion activity. Choose the best answer for Test 13.

A. Alloy

B. Hard water

C. pH

D. Polymer

Correct Answer: C. pHExplanation: 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 Bilingual with Answers | Military Brat Defence Academy

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?

Identify the term that is gradual deterioration of a material through chemical reactions.

Identify the term that contains appreciable dissolved calcium or magnesium ions.

Identify the term that is a metallic material containing more than one element.

Identify the term that is a macromolecule built from repeating monomer units. Choose the best answer for Test 13.

Identify the term that uses electric current to drive a non-spontaneous chemical change. Choose the best answer for Test 13.

Identify the term that changes reaction rate without being consumed overall.

Identify the term that involves gain of electrons or decrease in oxidation state.

Identify the term that involves loss of electrons or increase in oxidation state.

Identify the term that is reaction of an acid with a base to form salt and water.

Identify the term that is a logarithmic measure related to hydrogen-ion activity. Choose the best answer for Test 13.

Free MCQs with Answers and Explanations