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Nomenclature and Classification Systems MCQs

Prepare for Nomenclature and Classification Systems MCQs with verified questions, past-paper solutions, and conceptual explanations for CSS, PMS, FPSC, PPSC, and NTS examinations.

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Practice Questions

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390987 MCQs Page 159

Topic Notes: Biology

These notes summarize the key preparation context before you attempt the MCQs. Review the topic focus, then practice the questions below with answers and explanations.

Quick Overview

Practice Biology MCQs to prepare for CSS, PMS, FPSC, PPSC, SPSC, KPPSC, BPSC, NTS, and university entry tests in Pakistan. This section covers key theoretical concepts, syllabus topics, and repeated past paper questions related to Biology.

Topic-Wise Breakdown
Structured subject modules organized by difficulty and exam frequency.
Verified Answer Keys
Detailed explanations cross-referenced with standard textbooks and commission keys.
Complete Coverage
Covers fundamental definitions, advanced problem-solving, and recent exam trends.

How to Prepare Biology MCQs for Competitive Exams

Review each sub-topic systematically. Start with fundamental concepts, practice multiple-choice question sets under timed conditions, and note down questions you missed in your revision tracker. Select a specific topic from the list below to begin practice.

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1581
Two pipes A and B can fill a tank in 20 and 30 minutes respectively. If both pipes are opened, when must A be closed to fill the tank in exactly 18 minutes?
1582
Pipe A can fill a tank 3 times faster than Pipe B. If Pipe B takes 32 minutes to fill the tank, how long will they take if opened together?
1583
A tank has a leak which would empty it in 6 hours. A tap is turned on which admits 4 liters a minute, and the tank is now emptied in 8 hours. What is the capacity of the tank?
1584
Three pipes A, B, and C can fill a tank in 6, 9, and 12 hours respectively. If all are opened together, what fraction of the tank is filled in one hour?
1585
Pipe A fills a tank in 6 hours and Pipe B fills it in 8 hours. If both are opened and Pipe A is closed after 2 hours, how much more time will B take to fill the remaining part?
1586
A cistern is normally filled in 8 hours but takes 2 hours longer to fill because of a leak in its bottom. If the cistern is full, in how much time will the leak empty it?
1587
Two pipes A and B can fill a cistern in 12 and 16 minutes respectively. If both are opened simultaneously, when should B be closed so that the tank is full in 9 minutes?
1588
Pipe A can fill a tank in 10 hours and Pipe B can empty it in 15 hours. If both are opened together, how long will it take to fill the tank?
1589
A man rows 12 km upstream and 18 km downstream in 6 hours each. What is the speed of the boat in still water?
1590
A boat can travel 30 km downstream in 3 hours. If the speed of the stream is 2 km/hr, what is the speed of the boat in still water?