Gujarat Board Class VIII Science: Friction Online Test (Set 02 (Advanced Level))

Chapter Study Guide & In-Depth Notes

Master the key concepts, vocabulary, and high-yield questions before starting the test.

3 Sections

Chapter Overview & Core Concepts: Friction

Class 8 Study Guide

Mastering Friction in Class 8 provides critical subject intuition, analytical skills, and examination readiness.

Examinations test fundamental principles, definitions, cause-and-effect reasoning, and real-world applications under timed conditions.

Core Moral & Key Takeaway:

Grasping core concepts and practicing with timed chapter-wise CBT tests guarantees top performance in board exams.

Key Terminology, Definitions & Principles

Glossary & Concepts

Term / Formula	Type	Definition / Meaning	Explanation / Notes	Example / Usage
Core Concept	Principle	Primary concept governing Friction.	मुख्य सिद्धांत	"Understand and apply the principle accurately."
Analytical Deduction	Skill	Evaluating evidence to draw correct conclusions.	तार्किक विश्लेषण	"Examine question clues systematically."

Key Features & Devices Explored:

Systematic Elimination

Eliminate distractor choices before selecting the best answer.

Pacing & Accuracy

Complete each question within 60 seconds to maintain steady momentum.

High-Yield Revision Points & Solved Board Exam Q&A

Revision Notes

⚡ High-Yield Exam Takeaways:

Review all key textbook terms, definitions, and formulas.
Pay attention to units, boundary values, and key keywords in questions.
Solve Foundation Set 01 to build confidence, followed by Advanced Set 02 for exam excellence.

Frequently Asked Questions & Model Answers:

Q1 How should students prepare for Friction exams?

Answer: Read the chapter thoroughly, practice step-by-step solved examples, memorize key definitions, and evaluate preparation using timed online CBT mock tests.

Sample Questions Preview

Free Sneak Peek

Here is a sneak peek of the questions included in this test set. Test your preparation by viewing the answer and detailed explanation before starting the timed exam.

Q1

Why is static friction referred to as a 'self-adjusting force'?

સ્થિર ઘર્ષણને 'સ્વ-સમયોજન બળ' તરીકે શા માટે ઓળખવામાં આવે છે?

A

It increases equally and opposite to the applied horizontal force, exactly balancing it up to the limiting friction value / It increases equally and opposite to the applied horizontal force, exactly balancing it up to the limiting friction valueતે લાગુ કરેલા આડા બળની બરાબર અને વિરુદ્ધ વધે છે, તેને મર્યાદિત ઘર્ષણ મૂલ્ય સુધી બરાબર સંતુલિત કરે છે / તે લાગુ કરેલા આડા બળની બરાબર અને વિરુદ્ધ વધે છે, તેને મર્યાદિત ઘર્ષણ મૂલ્ય સુધી બરાબર સંતુલિત કરે છે

B

It automatically generates electrical currents to weld surfaces together / It automatically generates electrical currents to weld surfaces togetherતે સપાટીને એકસાથે વેલ્ડ કરવા માટે આપમેળે વિદ્યુત પ્રવાહ ઉત્પન્ન કરે છે / તે સપાટીને એકસાથે વેલ્ડ કરવા માટે આપમેળે વિદ્યુત પ્રવાહ ઉત્પન્ન કરે છે

C

It decreases to zero whenever any heavy mass is placed on it / It decreases to zero whenever any heavy mass is placed on itજ્યારે પણ તેના પર કોઈ ભારે દળ મૂકવામાં આવે છે ત્યારે તે ઘટીને શૂન્ય થઈ જાય છે / જ્યારે પણ તેના પર કોઈ ભારે દળ મૂકવામાં આવે છે ત્યારે તે ઘટીને શૂન્ય થઈ જાય છે

D

It reverses direction randomly every microsecond / It reverses direction randomly every microsecondતે દરેક માઇક્રોસેકન્ડ / તે દરેક માઇક્રોસેકન્ડે રેન્ડમલી દિશા ઉલટાવે છે

Correct Answer: Option A

Explanation:

Explanation: If you apply 2 N on a heavy box and it doesn't move, static friction is exactly 2 N. If you apply 5 N and it remains still, static friction adjusts to 5 N, up to its limiting threshold.

સમજૂતી: If you apply 2 N on a heavy box and it doesn't move, static friction is exactly 2 N. If you apply 5 N and it remains still, static friction adjusts to 5 N, up to its limiting threshold.

સમજણ: જો તમે ભારે બોક્સ પર 2 N લાગુ કરો છો અને તે આગળ વધતું નથી, તો સ્થિર ઘર્ષણ બરાબર 2 N છે. જો તમે 5 N લાગુ કરો છો અને તે સ્થિર રહે છે, તો સ્થિર ઘર્ષણ તેની મર્યાદાની મર્યાદા સુધી, 5 N પર ગોઠવાય છે. ખસેડતું નથી, સ્થિર ઘર્ષણ બરાબર 2 N છે. જો તમે 5 N લાગુ કરો છો અને તે સ્થિર રહે છે, તો સ્થિર ઘર્ષણ તેના મર્યાદિત થ્રેશોલ્ડ સુધી 5 N સુધી ગોઠવાય છે.

Q2

Why does sliding friction have a lower magnitude than static friction for the same pair of surfaces?

સરફેસની સમાન જોડી માટે સ્લાઇડિંગ ઘર્ષણની તીવ્રતા સ્થિર ઘર્ષણ કરતાં ઓછી કેમ હોય છે?

A

Sliding melts the outer electrons into a frictionless superfluid / Sliding melts the outer electrons into a frictionless superfluidસ્લાઇડિંગ બાહ્ય ઇલેક્ટ્રોનને ઘર્ષણ રહિત સુપરફ્લુઇડમાં પીગળે છે / સ્લાઇડિંગ બાહ્ય ઇલેક્ટ્રોનને ઘર્ષણ રહિત સુપરફ્લુઇડમાં પીગળે છે

B

Once surfaces are in relative motion, contact points do not get sufficient time to interlock deeply / Once surfaces are in relative motion, contact points do not get sufficient time to interlock deeplyએકવાર સપાટીઓ સાપેક્ષ ગતિમાં હોય છે, સંપર્ક બિંદુઓને ઊંડેથી ઇન્ટરલોક કરવા માટે પૂરતો સમય મળતો નથી / એકવાર સપાટીઓ સાપેક્ષ ગતિમાં હોય છે, સંપર્ક બિંદુઓને ઊંડે ઇન્ટરલોક કરવા માટે પૂરતો સમય મળતો નથી

C

The mass of a moving object becomes lighter according to relativity / The mass of a moving object becomes lighter according to relativityમૂવિંગ ઓબ્જેક્ટનું દળ સાપેક્ષતાના અનુસાર હળવા બને છે / મુવિંગ ઓબ્જેક્ટનું દળ સાપેક્ષતા અનુસાર હળવું બને છે

D

Air molecules form an impenetrable vacuum cushion / Air molecules form an impenetrable vacuum cushionહવા પરમાણુઓ એક અભેદ્ય શૂન્યાવકાશ ગાદી બનાવે છે / વાયુના અણુઓ અભેદ્ય વેક્યુમ ગાદી બનાવે છે

Correct Answer: Option B

Explanation:

Explanation: When a body begins sliding, contact points on one surface do not get enough time to lock into the interlocking grooves of the other surface; hence less force is needed to maintain sliding.

સમજૂતી: When a body begins sliding, contact points on one surface do not get enough time to lock into the interlocking grooves of the other surface; hence less force is needed to maintain sliding.

સમજૂતી: જ્યારે શરીર સરકવાનું શરૂ કરે છે, ત્યારે એક સપાટી પરના સંપર્ક બિંદુઓને બીજી સપાટીના ઇન્ટરલોકિંગ ગ્રુવ્સમાં લૉક કરવા માટે પૂરતો સમય મળતો નથી; તેથી સ્લાઇડિંગ જાળવવા માટે ઓછા બળની જરૂર પડે છે.

__

_સમજુતી: જ્યારે શરીર સરકવાનું શરૂ કરે છે, ત્યારે એક સપાટી પરના સંપર્ક બિંદુઓને બીજી સપાટીના આંતરલોકીંગ ગ્રુવ્સમાં લૉક કરવા માટે પૂરતો સમય મળતો નથી; તેથી સ્લાઇડિંગ જાળવવા માટે ઓછા બળની જરૂર પડે છે.

How Chapter-Wise Online CBT Tests Build Winning Habits for Future Competitive Exams

Early practice in high school builds the mental muscle, speed, and analytical discipline required to ace NTSE, Olympiads, JNVST, CUET, and Foundation JEE/NEET.

Competitive Edge

Real-Time Clock Awareness & Pacing

समय प्रबंधन एवं गति नियंत्रण

In school examinations, students write answers without active pacing. In national entrance tests, students have barely 45-60 seconds per MCQ. Practicing with a 20-minute timer instills instinctive time-budgeting and prevents last-minute exam panic.

Mastery of the Elimination Technique

विकल्प निष्कासन विधि में दक्षता

Top rankers in competitive exams rarely compute every problem blindly. They spot subtle traps, evaluate extreme values, and eliminate 2 out of 4 distractors within seconds. Our 4-option sets teach critical distractor analysis.

CBT Screen Stamina & Digital Comfort

कंप्यूटर आधारित परीक्षा का सहज अभ्यास

Almost all major national exams (CUET, JEE, NEET, SSC, Banking) are 100% computer-based. Students who only study on paper experience eye strain and navigation mistakes on exam day. Early CBT practice creates effortless digital fluency.

Immunity to Negative Marking

सटीकता और नकारात्मक अंकन से सुरक्षा

Careless errors—such as misreading "NOT" or "EXCEPT"—ruin thousands of competitive aspirations each year. Regular objective testing builds the habit of double-checking question keywords before locking answers.

Instant Diagnostic Feedback Loop

तत्काल त्रुटि निवारण एवं आत्म-मूल्यांकन

Traditional paper tests take weeks to grade, by which time the student has forgotten their thought process. TargetExams provides instant scorecards and step-by-step solutions while the conceptual puzzle is still fresh.

Syllabus Concepts Evaluated in this Chapter

This test series specifically evaluates the core competencies and learning objectives outlined in the official syllabus:

Core definitions, fundamental theorems, and essential concepts of this chapter.
Step-by-step mathematical reasoning and deductive problem-solving.
Application of standard formulas and operations in real-world scenarios.
Critical examination of common exam pitfalls and misleading options.
Higher-order thinking skill (HOTS) questions to prepare for school examinations.
Speed and accuracy mastery under standard timed CBT exam conditions.

Exam Rules & Test Taking Guidelines

Total Questions: The test consists of exactly 20 objective type questions.
Time Allowed: 20 Minutes countdown timer begins as soon as the test launches.
Marking Scheme: +1.0 mark is awarded for each correct answer.
Zero Penalty: There is 0.0 negative marking for incorrect or unattempted questions.
Question Palette: Freely navigate between questions and flag questions for later review.
Review & Solutions: Access instant scorecard and full step-by-step solutions upon submission.

Frequently Asked Questions (FAQs)

Yes! Foundation Practice Set 01 for every chapter in Gujarat Board Class VIII Science is 100% free to attempt. Students can test their knowledge without any payment or hidden fees.

This page is dedicated to English Medium. You can also attempt this test in Hindi Medium by clicking the switcher at the top.

Absolutely. All 20 multiple-choice questions are strictly designed in line with the latest guidelines, covering both basic conceptual understanding and higher-order thinking skills.

The test contains 20 MCQs to be solved in 20 minutes. Each question carries +1.0 mark for a correct answer, and there is zero (0.0) negative marking for incorrect answers.

Yes. Immediately upon submitting your test, you receive a comprehensive performance summary including your total score, accuracy percentage, time spent per question, and full step-by-step explanations for all 20 questions.

Gujarat Board Class VIII Science: Friction Online Test (Set 02 (Advanced Level)) | TargetExams

Chapter Study Guide & In-Depth Notes

Chapter Overview & Core Concepts: Friction