AP Polycet (Polytechnic) 2025 Previous Question Paper with Answers And Model Papers With Complete Analysis

111)What is the process called when fats and oils are oxidised and their smell and taste change?

A) Corrosion

B) Rancidity

C) Combustion

D) Oxidation

View Answer

B) Rancidity
Explanation:Oxidation of fats/oils changing smell/taste
→ Rancidity

112)If someone in your family is suffering from acidity after overeating, which of the following would you suggest as a remedy?

A) Lemon juice

B) Vinegar

C) Baking soda solution

D) Saltwater

View Answer

C) Baking soda solution
Explanation:Remedy for acidity after overeating
→ Baking soda solution

113)Which of the following can be used as olfactory indicators?

A) Vanilla essence, turmeric and clove oil

B) Red cabbage, vanilla essence and onion

C) Turmeric, onion and litmus

D) Vanilla essence, onion and clove oil

View Answer

D) Vanilla essence, onion and clove oil
Explanation:Olfactory indicators → Vanilla essence, onion and clove oil

114)Phenolphthalein is used as an indicator in the reaction between

A) acid and base

B) acid and metal

C) base and metal oxide

D) acid and non-metallic oxide

View Answer

A) acid and base
Explanation:Phenolphthalein is used in reaction between
→ Acid and base

115)Which of the following is a synthetic indicator?

A) Turmeric

B) Methyl orange

C) Litmus solution

D) Red cabbage extract

View Answer

B) Methyl orange
Explanation:Synthetic indicator
→ Methyl orange

116)Why do acidic solutions conduct electricity?

A) Due to the presence of water molecules

B) Due to the presence of free electrons

C) Due to the presence of ions in the solution

D) Because acids are solid conductors

View Answer

C) Due to the presence of ions in the solution
Explanation:Acidic solutions conduct electricity due to
→ Presence of ions in the solution

117)Tooth decay begins when the pH of the mouth drops below:

A) 6.5

B) 5.5

C) 4.5

D) 7.0

View Answer

B) 5.5
Explanation:Tooth decay starts below pH
→ 5.5

118)What chemical is responsible for the pain caused by a bee sting?

A) Methanoic acid

B) Hydrochloric acid

C) Acetic acid

D) Sulphuric acid

View Answer

A) Methanoic acid
Explanation:Pain from bee sting is due to
→ Methanoic acid

119)What is the chemical formula of Plaster of Paris?

A) CaSO₄ ·2H₂O

B) CaSO₄ ·½ 2H₂O

C) CaCO₃

D) CaOCl₂

View Answer

B) CaSO₄ ·½ 2H₂O
Explanation:Chemical formula of Plaster of Paris
→ CaSO₄·½H₂O

120)Which property of metals describes their shiny surface?

A) Malleability

B) Ductility

C) Metallic luster

D) Conductivity

View Answer

C) Metallic luster
Explanation:Property describing shiny surface of metals
→ Metallic luster

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