PPSC Prelims 2025 GS Question Paper (07-Dec-2025)

Match the following leaders with their journals :Choose the correct code from the following:

Consider the following pairs :Which of the above pairs are correctly matched ?

Consider the following statements regarding soaps :
1. A soap molecule has a hydrophobic head and a hydrophilic tail.
2. Aqueous solution of soap above critical micelle concentration will show the Tyndall effect.
Which of the above statements is/are correct?

For the Assertion (A) and Reason (R) given below, choose the correct alternative from the following:
Assertion (A): Stainless steel is considered a highly corrosion-resistant material.
Reason (R): It contains chromium, which reacts with oxygen in the air to form a protective oxide layer.

Consider the following statements about enzymes :
1. Enzymes increase the activation energy of a reaction.
2. Enzymes work at their optimum temperature and pH.
3. The activity of enzymes cannot be affected by other compounds.
4. Enzymes need to be used in excess compared to the reagent to catalyse the reaction.
How many of the above statements is/are correct?