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

QID #24978 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Hard

Which explanation of Base is most accurate?

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: Which explanation of Base is most accurate?

A. contains appreciable dissolved calcium or magnesium ions

B. is gradual deterioration of a material through chemical reactions

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

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.

View Question WhatsApp Share

QID #24977 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Hard

Which explanation of Acid is most accurate?

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: Which explanation of Acid is most accurate?

A. is a macromolecule built from repeating monomer units

B. is a metallic material containing more than one element

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

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

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.

View Question WhatsApp Share

QID #24976 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Hard

Which explanation of Covalent bond is most accurate?

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: Which explanation of Covalent bond is most accurate?

A. changes reaction rate without being consumed overall

B. involves sharing of electron pairs between atoms

C. involves loss of electrons or increase in oxidation state

D. involves gain of electrons or decrease in oxidation state

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.

View Question WhatsApp Share

QID #24975 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Hard

Which explanation of Ionic bond is most accurate?

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: Which explanation of Ionic bond is most accurate?

A. forms through electrostatic attraction between oppositely charged ions

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

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: 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.

View Question WhatsApp Share

QID #24974 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Hard

Which explanation of Isotope is most accurate?

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: Which explanation of Isotope is most accurate?

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. 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.

View Question WhatsApp Share

QID #24973 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Hard

Which explanation of Atomic number is most accurate?

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: Which explanation of Atomic number is most accurate?

A. contains substances physically combined in variable proportions

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

C. equals the number of protons in an atomic nucleus

D. contains elements chemically combined in fixed proportions

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.

View Question WhatsApp Share

QID #24972 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Hard

Which explanation of Mixture is most accurate?

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: Which explanation of Mixture is most accurate?

A. contains atoms with the same atomic number

B. contains substances physically combined in variable proportions

C. is gradual deterioration of a material through chemical reactions

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

Correct Answer: B. 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 #24971 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Hard

Which explanation of Compound is most accurate?

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: Which explanation of Compound is most accurate?

A. contains elements chemically combined in fixed proportions

B. is a macromolecule built from repeating monomer units

C. is a metallic material containing more than one element

D. contains appreciable dissolved calcium or magnesium ions

Correct Answer: A. 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 #24970 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Hard

Which explanation of Element is most accurate?

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: Which explanation of Element is most accurate?

A. involves gain of electrons or decrease in oxidation state

B. changes reaction rate without being consumed overall

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

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.

View Question WhatsApp Share

QID #24969 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Hard

Which explanation of Atom is most accurate?

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: Which explanation of Atom is most accurate?

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 the smallest unit retaining the chemical identity of an element

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

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.

View Question WhatsApp Share

QID #24968 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Hard

Choose the option that accurately represents Corrosion.

Correct Answer: D. 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: Choose the option that accurately represents Corrosion.

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. is gradual deterioration of a material through chemical reactions

Correct Answer: D. 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 #24967 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Hard

Choose the option that accurately represents Hard water.

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

Question: Choose the option that accurately represents Hard water.

A. equals the number of protons in an atomic nucleus

B. contains elements chemically combined in fixed proportions

C. contains appreciable dissolved calcium or magnesium ions

D. contains substances physically combined in variable proportions

Correct Answer: C. 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 #24966 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Hard

Choose the option that accurately represents Alloy.

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

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 atoms with the same atomic number

Correct Answer: B. 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 #24965 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Hard

Choose the option that accurately represents Polymer.

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

Question: Choose the option that accurately represents Polymer.

A. is a macromolecule built from repeating monomer units

B. is a metallic material containing more than one element

C. contains appreciable dissolved calcium or magnesium ions

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

Correct Answer: A. 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 #24964 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Hard

Choose the option that accurately represents Electrolysis.

Correct Answer: D. 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: Choose the option that accurately represents Electrolysis.

A. involves gain of electrons or decrease in oxidation state

B. changes reaction rate without being consumed overall

C. involves loss of electrons or increase in oxidation state

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

Correct Answer: D. 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 #24963 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Hard

Choose the option that accurately represents Catalyst.

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

Question: Choose the option that accurately represents Catalyst.

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

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

C. changes reaction rate without being consumed overall

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

Correct Answer: C. 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 #24962 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Hard

Choose the option that accurately represents Reduction.

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

A. forms through electrostatic attraction between oppositely charged ions

B. involves gain of electrons or decrease in oxidation state

C. involves sharing of electron pairs between atoms

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

Correct Answer: B. 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 #24961 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Hard

Choose the option that accurately represents Oxidation.

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

A. involves loss of electrons or increase in oxidation state

B. equals the number of protons in an atomic nucleus

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

D. contains substances physically combined in variable proportions

Correct Answer: A. 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 #24960 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Hard

Choose the option that accurately represents Neutralization.

Correct Answer: D. 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: Choose the option that accurately represents Neutralization.

A. contains atoms with the same atomic number

B. contains elements chemically combined in fixed proportions

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

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

Correct Answer: D. 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 #24959 AIIMS UPPSC Health Education Officer (HEO) 2026 Mock Test Series General Science Chemistry Hard

Choose the option that accurately represents pH.

Correct Answer: C. 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: Choose the option that accurately represents pH.

A. is gradual deterioration of a material through chemical reactions

B. is a metallic material containing more than one element

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

D. contains appreciable dissolved calcium or magnesium ions

Correct Answer: C. 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

Which explanation of Base is most accurate?

Which explanation of Acid is most accurate?

Which explanation of Covalent bond is most accurate?

Which explanation of Ionic bond is most accurate?

Which explanation of Isotope is most accurate?

Which explanation of Atomic number is most accurate?

Which explanation of Mixture is most accurate?

Which explanation of Compound is most accurate?

Which explanation of Element is most accurate?

Which explanation of Atom is most accurate?

Choose the option that accurately represents Corrosion.

Choose the option that accurately represents Hard water.

Choose the option that accurately represents Alloy.

Choose the option that accurately represents Polymer.

Choose the option that accurately represents Electrolysis.

Choose the option that accurately represents Catalyst.

Choose the option that accurately represents Reduction.

Choose the option that accurately represents Oxidation.

Choose the option that accurately represents Neutralization.

Choose the option that accurately represents pH.

Free MCQs with Answers and Explanations