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CBSE Class 8 Science Chapter 8 Force and Pressure Worksheet with Answers

CBSE Class 8 Science Chapter 8 introduces students to the fundamental concepts of Force and Pressure, two interrelated physical quantities that govern motion, equilibrium, and fluid behaviour. This printable worksheet provides structured practice across multiple question formats—MCQs, fill-in-the-blanks, short and long answers, and case studies—all aligned with the latest NCERT syllabus and CBSE exam pattern. Students can download, print, and complete this worksheet in approximately 90 minutes to assess their understanding and identify areas needing revision.

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Key takeaways

✓Force is a push or pull that can change the state of motion, shape, or direction of an object, measured in Newtons (N).
✓Pressure is defined as force per unit area (P = F/A) and is measured in Pascals (Pa), with applications in everyday life from cutting tools to hydraulic systems.
✓Atmospheric pressure at sea level is approximately 101,325 Pa and decreases with altitude; it exerts force equally in all directions.
✓Buoyant force is the upward force exerted by a fluid on an immersed object, which determines whether objects float or sink.
✓Liquids exert pressure that increases with depth, which is why dams are thicker at the bottom and deep-sea divers face immense pressure.
✓This worksheet contains 30+ practice questions across difficulty levels, with a complete answer key and explanations for effective self-study.
✓Recommended time: 90 minutes; Difficulty level: Moderate to Challenging, suitable for exam preparation and concept reinforcement.

Quick Chapter Recap: Force and Pressure

Chapter 8 of NCERT Class 8 Science explores Force and Pressure as core concepts in Physics. A force is any push or pull acting on an object, capable of changing its state of rest or motion, altering its shape, or changing its direction. Forces can be contact forces (like friction, muscular force) or non-contact forces (like magnetic force, gravitational force, electrostatic force). The SI unit of force is the Newton (N). Pressure, on the other hand, is the force acting perpendicularly on a unit area of a surface, calculated using the formula P = F/A, where P is pressure, F is force, and A is the area. Pressure is measured in Pascals (Pa), where 1 Pa = 1 N/m². The chapter also covers atmospheric pressure—the pressure exerted by the weight of air in the atmosphere—which is approximately 101,325 Pa at sea level. Finally, buoyancy or buoyant force is the upward force exerted by a fluid (liquid or gas) on an object immersed in it, explaining why objects float or sink. Understanding these concepts helps explain phenomena from why a camel can walk easily on sand to how hydraulic machines work.

Force: A push or pull that can change motion, shape, or direction; measured in Newtons (N).
Pressure: Force per unit area (P = F/A); measured in Pascals (Pa).
Atmospheric Pressure: Pressure exerted by air; about 101,325 Pa at sea level, decreases with altitude.
Buoyant Force: Upward force by fluids on immersed objects; determines floating and sinking.
Liquids exert pressure in all directions; pressure increases with depth.

Section A: Multiple Choice Questions (MCQs)

This section contains six multiple-choice questions designed to test conceptual understanding and application of Force and Pressure principles covered in CBSE Class 8 Science Chapter 8. Each question has four options, with only one correct answer. MCQs are an integral part of CBSE examinations and help students develop quick recall and analytical skills. These questions cover the definition of force, units of pressure, atmospheric pressure concepts, applications of pressure in daily life, and buoyancy. Students should attempt all questions without referring to notes initially, then check answers in the answer key section. Each MCQ carries one mark in typical CBSE assessments. This format trains students to identify the precise answer among similar-looking options, a critical skill for board exams and competitive tests. Practicing MCQs regularly sharpens reasoning and helps eliminate silly mistakes during exams.

1. The SI unit of pressure is: (a) Newton (b) Pascal (c) Kilogram (d) Joule
2. Which of the following is a contact force? (a) Magnetic force (b) Gravitational force (c) Frictional force (d) Electrostatic force
3. Atmospheric pressure is maximum at: (a) Sea level (b) Mountain top (c) Inside a vacuum (d) In space
4. A sharp knife cuts better than a blunt one because: (a) It exerts more force (b) It exerts less force (c) It has smaller area and exerts more pressure (d) It has larger area
5. The upward force exerted by a liquid on an object is called: (a) Gravitational force (b) Magnetic force (c) Buoyant force (d) Frictional force
6. Pressure exerted by a liquid at a point inside the liquid: (a) Increases with depth (b) Decreases with depth (c) Remains constant (d) Is zero

Section B: Fill in the Blanks

Fill-in-the-blank questions assess students' grasp of terminology, definitions, units, and specific factual knowledge from Class 8 Science Chapter 8 on Force and Pressure. This section contains five carefully crafted statements with missing key terms that students must complete. Such questions often appear in CBSE Class 8 Science examinations and require precise recall of NCERT content. Students should write the exact terms as used in the textbook to avoid marking errors. These questions cover units of measurement, definitions of force and pressure, atmospheric phenomena, and properties of liquids. Completing this section reinforces vocabulary and ensures that students can articulate scientific concepts accurately in exams. It is recommended that students first attempt to fill in all blanks from memory, then verify answers using the answer key provided later in this worksheet. Each blank typically carries half to one mark in school assessments.

1. Force acting on a unit area is called __________.
2. The SI unit of force is __________, named after the scientist Isaac Newton.
3. __________ pressure is the pressure exerted by the weight of air in the atmosphere.
4. Liquids exert pressure on the __________ and bottom of the container in which they are kept.
5. An object will float in water if the __________ force is greater than or equal to its weight.

Section C: True or False Statements

True or False questions test whether students can distinguish correct statements from common misconceptions about Force and Pressure. This section presents six statements related to NCERT Class 8 Science Chapter 8 concepts, and students must identify each as true or false. This question type is popular in CBSE assessments because it quickly reveals conceptual gaps and challenges students to think critically about definitions, principles, and applications. Students should read each statement carefully—often a single word can change the meaning entirely. After marking each statement as true or false, students should check the answer key and read the explanations to understand why a statement is correct or incorrect. This exercise builds precision in scientific thinking and helps students avoid common errors in board exams. For maximum benefit, attempt this section without looking at notes, then review mistakes thoroughly to strengthen understanding of fundamental concepts in force, pressure, atmospheric pressure, and buoyancy.

1. Pressure is directly proportional to the area on which force is applied. (True/False)
2. Atmospheric pressure decreases as we go higher above sea level. (True/False)
3. A wide belt is more comfortable than a thin strap because it applies less pressure. (True/False)
4. Gases do not exert pressure. (True/False)
5. The buoyant force on an object depends on the density of the liquid. (True/False)
6. Pressure exerted by a liquid is the same at all depths. (True/False)

Section D: Short Answer Questions (2-3 Marks Each)

Short-answer questions form the backbone of CBSE Class 8 Science examinations, typically carrying two to three marks each. This section includes five questions that require students to explain concepts, define terms, differentiate between related ideas, or describe phenomena covered in Chapter 8 Force and Pressure. Answers should be concise yet complete, generally ranging from 30 to 50 words or two to three clear sentences. Students must use correct scientific terminology from the NCERT textbook and, where applicable, include formulas or units. These questions assess understanding beyond rote memorization—students must be able to explain why sharp objects exert more pressure, how atmospheric pressure varies, what causes buoyancy, and practical applications of pressure. To score full marks, ensure each answer directly addresses the question, includes relevant examples or reasoning, and is written in clear language. Practice writing answers within the word limit to develop exam efficiency. Refer to the detailed answer key section for model answers and marking schemes.

1. Define pressure and write its SI unit. How is it related to force and area?
2. Why do school bags have wide straps instead of thin strings?
3. Explain why it is easier to walk on soft sand with flat shoes than with high heels.
4. What is atmospheric pressure? Why does it decrease with altitude?
5. Why does an iron nail sink in water while a wooden cork floats?

Section E: Long Answer and HOTS Questions (5 Marks Each)

Long-answer and Higher Order Thinking Skills (HOTS) questions challenge students to demonstrate deep conceptual understanding, application ability, and analytical reasoning related to Force and Pressure. This section contains three questions, each carrying five marks in typical CBSE assessments. Answers should be detailed, well-structured, and approximately 80 to 100 words long, often requiring multiple interconnected points, examples, diagrams, or derivations. These questions assess whether students can explain complex phenomena such as why dams are thicker at the bottom, how hydraulic systems work using Pascal's principle, or the factors affecting buoyant force. HOTS questions may present unfamiliar scenarios where students must apply chapter concepts creatively. To excel in this section, students should organize answers in clear paragraphs or numbered points, use scientific vocabulary accurately, mention relevant laws or principles, and include real-life examples where appropriate. Diagrams, when relevant, can earn additional marks. The answer key provides comprehensive model answers to guide students in structuring high-quality responses that meet CBSE marking standards.

1. Explain the concept of buoyant force. Why do some objects float while others sink? Describe the factors that affect buoyancy.
2. Why are the walls of a dam made thicker at the bottom than at the top? Explain with reference to liquid pressure.
3. Describe an experiment to demonstrate that liquids exert pressure on the walls of their container. Draw a labelled diagram and explain observations.

Section F: Case Study Question

Case-study questions are increasingly common in CBSE examinations, presenting real-world scenarios or experimental setups followed by multiple related questions. This format tests students' ability to apply theoretical knowledge from Class 8 Science Chapter 8 to practical situations. The case study below describes a situation involving force, pressure, and buoyancy, followed by four sub-questions that require analysis, calculation, and reasoning. Students must read the passage carefully, extract relevant information, and answer each part precisely. Such questions develop critical thinking and the ability to connect classroom learning with everyday phenomena. Case studies typically carry four to five marks and may include a mix of objective and subjective sub-questions. They simulate how scientists approach problems—observing, analyzing, and drawing conclusions. When answering, refer back to specific details in the passage and apply formulas or concepts learned in the chapter. This question type is excellent preparation not just for board exams but also for competitive examinations and real-life problem-solving situations encountered in higher studies and careers in science.

Complete Answer Key with Explanations

This comprehensive answer key provides correct answers and detailed explanations for every question in the worksheet, enabling students to self-assess and learn from mistakes. Each MCQ answer includes reasoning to help understand why other options are incorrect. Fill-in-the-blank answers are given with context. True/False answers explain the scientific principle behind each statement. Short answers are provided in the format expected in CBSE exams, with key points highlighted. Long answers and HOTS responses are structured as model answers that would earn full marks, including necessary diagrams, formulas, and real-life connections. The case study answers demonstrate how to extract information and apply concepts systematically. Students should attempt the entire worksheet first, then use this answer key for correction and learning. Where answers differ from the key, students should revisit the relevant NCERT sections or Class 8 Science notes to clarify doubts. This answer key serves as a valuable revision tool, especially during exam preparation, helping reinforce correct scientific understanding and examination techniques for CBSE Class 8 Science Chapter 8 Force and Pressure.

Section A Answers: 1(b) Pascal, 2(c) Frictional force is a contact force, 3(a) Maximum at sea level, 4(c) Smaller area creates more pressure, 5(c) Buoyant force, 6(a) Pressure increases with depth
Section B Answers: 1-pressure, 2-Newton, 3-Atmospheric, 4-walls, 5-buoyant
Section C Answers: 1-False (inversely proportional), 2-True, 3-True (larger area, less pressure), 4-False (gases exert pressure), 5-True, 6-False (increases with depth)
Section D Sample Answer (Q1): Pressure is the force acting perpendicularly per unit area of a surface. Its SI unit is Pascal (Pa). Pressure is directly proportional to force and inversely proportional to area: P = F/A.
Section E Sample Answer (Q2): Dam walls are thicker at the bottom because liquid pressure increases with depth. At greater depths, water exerts more force on the walls. To withstand this increased pressure and prevent structural failure, the walls must be stronger and thicker at the base. This is calculated using P = ρgh, where pressure P increases as depth h increases.

How to Use This Worksheet Effectively for CBSE Exam Preparation

To maximize learning outcomes from this CBSE Class 8 Science Chapter 8 worksheet, students should follow a systematic approach. First, ensure you have studied the NCERT textbook chapter thoroughly and reviewed your class notes. Set aside a quiet 90-minute block to attempt the worksheet under exam-like conditions—no books, no distractions. Start with Section A MCQs to build confidence, then progress through fill-in-the-blanks, true/false, and short answers before tackling long-answer and case-study questions. Write answers neatly in a notebook, as handwriting practice is valuable for board exams. After completing all sections, take a short break before using the answer key to mark your work honestly. For every mistake, revisit the relevant NCERT section and make notes on the concept you misunderstood. Pay special attention to questions you got wrong or found difficult—these reveal knowledge gaps that need focused revision. Reattempt incorrect questions after a few days to check retention. Students preparing for school exams or CBSE board assessments should complete multiple such worksheets to build speed and accuracy. CBSETUTOR.ai offers 24×7 AI-powered tutoring where students can photograph any question from this worksheet and receive instant, step-by-step explanations, making self-study more effective—all at a flat ₹999/month for Classes 6-12, with a 3-day free trial to experience personalized learning support.

Attempt the worksheet in one 90-minute sitting without referring to books or notes to simulate exam conditions.
Progress sequentially from MCQs through short answers to long answers and case studies, building confidence gradually.
Use the detailed answer key for self-assessment, paying special attention to explanations for questions you answered incorrectly.
Revisit NCERT Class 8 Science Chapter 8 sections for concepts you struggled with, making targeted revision notes.
Reattempt difficult questions after a few days to ensure concepts are retained and understood, not just memorized.
Practice writing answers within word limits and time constraints to develop exam efficiency and scoring ability.
For instant doubt-solving, use CBSETUTOR.ai to photograph questions and get step-by-step AI tutor explanations anytime.

Frequently asked questions

What is the difficulty level and recommended time for this Force and Pressure worksheet?+

This worksheet is of moderate to challenging difficulty, designed for thorough CBSE Class 8 Science Chapter 8 practice. Students should allocate approximately 90 minutes to complete all sections—MCQs, fill-in-the-blanks, true/false, short answers, long answers, and the case study—under exam-like conditions for best results.

Does this worksheet cover all topics from NCERT Class 8 Science Chapter 8?+

Yes, this worksheet comprehensively covers all major topics from Chapter 8: force as push and pull, definition and calculation of pressure, atmospheric pressure and its variation, liquid pressure and its dependence on depth, and buoyant force with floating and sinking phenomena, aligned completely with NCERT content.

Are the answers provided for all questions in this worksheet?+

Absolutely. A complete answer key with detailed explanations is provided for every question—MCQs with reasoning, correct terms for fill-in-the-blanks, justifications for true/false statements, model short answers, comprehensive long answers with diagrams where needed, and step-by-step case study solutions to facilitate effective self-assessment and learning.

How can I use this worksheet for CBSE board exam preparation?+

Attempt this worksheet without notes in a timed 90-minute session to simulate exam pressure. Mark your answers using the provided key, identify weak areas, and revise those NCERT sections thoroughly. Repeat difficult questions after a gap. Regular practice with such structured worksheets builds confidence, improves time management, and ensures comprehensive topic coverage for CBSE exams.

What is the formula for calculating pressure mentioned in this chapter?+

The fundamental formula for pressure is P = F/A, where P represents pressure measured in Pascals, F is the force applied perpendicularly in Newtons, and A is the area in square meters. For liquid pressure specifically, the formula is P = ρgh, where ρ is liquid density, g is gravitational acceleration, and h is depth.

Why do sharp objects like needles exert more pressure than blunt ones?+

Sharp objects have a much smaller area of contact compared to blunt objects. Since pressure is inversely proportional to area (P = F/A), the same force applied over a smaller area results in significantly greater pressure. This is why a sharp needle can easily pierce cloth while a blunt object with the same force cannot.

How does atmospheric pressure change with altitude and why?+

Atmospheric pressure decreases as altitude increases because there is less air above at higher elevations, resulting in lower weight of the air column pressing down. At sea level, atmospheric pressure is about 101,325 Pa, but it drops significantly on mountains. This is why mountaineers sometimes experience breathing difficulties and need oxygen support at very high altitudes.

What determines whether an object will float or sink in water?+

An object floats if the buoyant force (upward force exerted by the liquid) is greater than or equal to the object's weight. This depends on density: objects less dense than water (like wood or cork) float, while denser objects (like iron or stone) sink. The buoyant force equals the weight of liquid displaced by the object, according to Archimedes' principle.

Can I print this worksheet for offline practice?+

Yes, this worksheet is specifically designed to be printable for offline practice. Students can print all sections including questions and the answer key, complete the questions on paper under exam conditions, and then check answers. This develops exam writing skills and provides a realistic test experience valuable for CBSE board preparation.

Where can I get instant help if I am stuck on any question from this worksheet?+

CBSETUTOR.ai provides 24×7 AI tutor support where you can simply photograph any question from this worksheet and receive step-by-step explanations instantly. The platform covers all CBSE classes 6-12 at a flat ₹999/month with a 3-day free trial, offering personalized learning support whenever you need it, making self-study more effective and doubt-free.

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