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

QID #24958 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Hard

Choose the option that accurately represents Base.

Correct Answer: B. 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: Choose the option that accurately represents Base.

A. changes reaction rate without being consumed overall

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

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

D. is a macromolecule built from repeating monomer units

Correct Answer: B. 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.

View Question WhatsApp Share

QID #24957 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Hard

Choose the option that accurately represents Acid.

Correct Answer: A. 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: Choose the option that accurately represents Acid.

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

B. involves loss of electrons or increase in oxidation state

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: A. 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.

View Question WhatsApp Share

QID #24956 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Hard

Choose the option that accurately represents Covalent bond.

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

Question: Choose the option that accurately represents Covalent bond.

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

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

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

D. involves sharing of electron pairs between atoms

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

View Question WhatsApp Share

QID #24955 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Hard

Choose the option that accurately represents Ionic bond.

Correct Answer: C. 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: Choose the option that accurately represents Ionic bond.

A. involves sharing of electron pairs between atoms

B. equals the number of protons in an atomic nucleus

C. forms through electrostatic attraction between oppositely charged ions

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

Correct Answer: C. forms through electrostatic attraction between oppositely charged ionsExplanation: Ionic bond forms through electrostatic attraction between oppositely charged ions. The other choices describe different concepts.

View Question WhatsApp Share

QID #24954 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Hard

Choose the option that accurately represents Isotope.

Correct Answer: B. 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: Choose the option that accurately represents Isotope.

A. contains atoms with the same atomic number

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

C. contains elements chemically combined in fixed proportions

D. contains substances physically combined in variable proportions

Correct Answer: B. 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.

View Question WhatsApp Share

QID #24953 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Hard

Choose the option that accurately represents Atomic number.

Correct Answer: A. 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: Choose the option that accurately represents Atomic number.

A. equals the number of protons in an atomic nucleus

B. is gradual deterioration of a material through chemical reactions

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

D. contains appreciable dissolved calcium or magnesium ions

Correct Answer: A. 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.

View Question WhatsApp Share

QID #24952 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Hard

Choose the option that accurately represents Mixture.

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

Question: Choose the option that accurately represents Mixture.

A. is a macromolecule built from repeating monomer units

B. is a metallic material containing more than one element

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

D. contains substances physically combined in variable proportions

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

View Question WhatsApp Share

QID #24951 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Hard

Choose the option that accurately represents Compound.

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

Question: Choose the option that accurately represents Compound.

A. changes reaction rate without being consumed overall

B. involves loss of electrons or increase in oxidation state

C. contains elements chemically combined in fixed proportions

D. involves gain of electrons or decrease in oxidation state

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

View Question WhatsApp Share

QID #24950 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Hard

Choose the option that accurately represents Element.

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

Question: Choose the option that accurately represents Element.

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

B. contains atoms with the same atomic number

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

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

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

View Question WhatsApp Share

QID #24949 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Hard

Choose the option that accurately represents Atom.

Correct Answer: A. 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: Choose the option that accurately represents Atom.

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

B. involves sharing of electron pairs between atoms

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

D. forms through electrostatic attraction between oppositely charged ions

Correct Answer: A. 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.

View Question WhatsApp Share

QID #24948 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Medium

How is Corrosion best explained?

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: How is Corrosion best explained?

A. contains elements chemically combined in fixed proportions

B. is gradual deterioration of a material through chemical reactions

C. contains substances physically combined in variable proportions

D. contains atoms with the same atomic number

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.

View Question WhatsApp Share

QID #24947 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Medium

How is Hard water best explained?

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: How is Hard water best explained?

A. contains appreciable dissolved calcium or magnesium ions

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

C. is a metallic material containing more than one element

D. is gradual deterioration of a material through chemical reactions

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.

View Question WhatsApp Share

QID #24946 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Medium

How is Alloy best explained?

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: How is Alloy best explained?

A. is a macromolecule built from repeating monomer units

B. changes reaction rate without being consumed overall

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

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.

View Question WhatsApp Share

QID #24945 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Medium

How is Polymer best explained?

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: How is Polymer best explained?

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 macromolecule built from repeating monomer units

D. involves gain of electrons or decrease in oxidation state

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.

View Question WhatsApp Share

QID #24944 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Medium

How is Electrolysis best explained?

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: How is Electrolysis best explained?

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

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

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

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

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.

View Question WhatsApp Share

QID #24943 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Medium

How is Catalyst best explained?

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: How is Catalyst best explained?

A. changes reaction rate without being consumed overall

B. involves sharing of electron pairs between atoms

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

D. forms through electrostatic attraction between oppositely charged ions

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

View Question WhatsApp Share

QID #24942 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Medium

How is Reduction best explained?

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: How is Reduction best explained?

A. equals the number of protons in an atomic nucleus

B. contains elements chemically combined in fixed proportions

C. contains substances physically combined in variable proportions

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.

View Question WhatsApp Share

QID #24941 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Medium

How is Oxidation best explained?

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: How is Oxidation best explained?

A. is gradual deterioration of a material through chemical reactions

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

C. involves loss of electrons or increase in oxidation state

D. contains atoms with the same atomic number

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.

View Question WhatsApp Share

QID #24940 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Medium

How is Neutralization best explained?

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: How is Neutralization best explained?

A. is a metallic material containing more than one element

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

C. contains appreciable dissolved calcium or magnesium ions

D. is a macromolecule built from repeating monomer units

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.

View Question WhatsApp Share

QID #24939 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Medium

How is pH best explained?

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: How is pH best explained?

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

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

C. involves gain of electrons or decrease in oxidation state

D. changes reaction rate without being consumed overall

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.

View Question WhatsApp Share

UPPSC Health Education Officer (HEO) 2026 Mock Test Series with Answers | Military Brat Defence Academy

Choose the option that accurately represents Base.

Choose the option that accurately represents Acid.

Choose the option that accurately represents Covalent bond.

Choose the option that accurately represents Ionic bond.

Choose the option that accurately represents Isotope.

Choose the option that accurately represents Atomic number.

Choose the option that accurately represents Mixture.

Choose the option that accurately represents Compound.

Choose the option that accurately represents Element.

Choose the option that accurately represents Atom.

How is Corrosion best explained?

How is Hard water best explained?

How is Alloy best explained?

How is Polymer best explained?

How is Electrolysis best explained?

How is Catalyst best explained?

How is Reduction best explained?

How is Oxidation best explained?

How is Neutralization best explained?

How is pH best explained?

Free MCQs with Answers and Explanations