Sakil Ahmed Classes

  1. Find the value of √2 up to two decimal places using square root. Answer: √2 ≈ 1.41 2. Write two irrational numbers whose sum and product are rational. Answer:  Let the two irrational numbers be √2 and −√2 Sum = √2 − √2 = 0 (rational) Product = √2 × (−√2) = −2 (rational) 3. Write all integers between −5 and 5 with the help of number line. Answer: Integers: −4, −3, −2, −1, 0, 1, 2, 3, 4 4. Show that a⁰ = 1 using aᵐ ÷ aⁿ = aᵐ⁻ⁿ (taking m = n). Answer: aᵐ ÷ aᵐ = aᵐ⁻ᵐ = a⁰ But aᵐ ÷ aᵐ = 1 ∴ a⁰ = 1 5. Show that a⁻ⁿ = 1/aⁿ using aᵐ ÷ aⁿ = aᵐ⁻ⁿ (taking m = 0). Answer: a⁰ ÷ aⁿ = a⁰⁻ⁿ = a⁻ⁿ But a⁰ = 1 ∴ 1 ÷ aⁿ = a⁻ⁿ ∴ a⁻ⁿ = 1/aⁿ 6. Find LCM and HCF using prime factorisation (i) 321, 396 321 = 3 × 107 396 = 2² × 3² × 11 HCF = 3 LCM = 2² × 3² × 11 × 107 = 42372 (ii) 455, 42 455 = 5 × 7 × 13 42 = 2 × 3 × 7 HCF = 7 LCM = 2 × 3 × 5 × 7 × 13 = 2730 (iii) 408, 170 408 = 2³ × 3 × 17 170 = 2 × 5 × 17 HCF = 2 × 17 = 34 LCM = 2³ × 3 × 5 × 17 = 204...

  Chapter 1: The Ever Evolving World of Science. A. Recalling Ideas I. Select the correct option: 1. Science often begins with: (a) Difficult theories (b) Simple questions and playful ideas ✅ (c) Making elaborate notes (d) Sitting idle 2. Exploration in science is how we approach the unknown with: (a) Curiosity, questions and an open mind ✅ (b) Confusion and closed mind (c) Discussion (d) Confusion and discussion 3. What connects different branches of science like physics, chemistry and biology? (a) History (b) Observation and experimentation ✅ (c) Ancient traditions (d) Games and puzzles 4. Science is a journey of: (a) Memorising (b) Learning (c) Discovery ✅ (d) Revising 5. What is the purpose of a sundial? (a) To measure weight (b) To study motion (c) To tell time using shadows ✅ (d) To generate electricity 6. Which of the following is not a feature of science learning? (a) Curiosity (b) Exploration (c) Passive listening ✅ (d) Hands-on activiti...

Chapter 1: Exploring The Investigative World of Science. A. Recalling Ideas 1. In the ice cube melting experiment, the cube melted fastest on the metal plate because: (a) Metal is an insulator (b) Metal is a good conductor of heat ✅ (c) Metal reflects heat (d) Metal absorbs water 2. Which of the following is not a type of microbe? (a) Bacteria (b) Virus (c) Yeast (d) Pebbles ✅ 3. Which state of matter has particles that are tightly packed and only vibrate in place? (a) Gas (b) Liquid (c) Solid ✅ (d) Plasma 4. An ecosystem is made up of: (a) Only plants and animals (b) Only water and air (c) Living things and their environment ✅ (d) Rocks and soil only 5. The first step in developing a scientific temperament is: (a) Accepting information without doubt (b) Asking questions and being curious ✅ (c) Memorising facts (d) Avoiding experiments 6. Which of these is not a quality of scientific thinking? (a) Observation (b) Experimentation (c) Superstition ✅ (d...

Hindi Worksheet  Chapter: वर्ण, शब्द और वाक्य Section A – वर्ण ज्ञान (8 Marks) स्वर और व्यंजन लिखो। नीचे दिए गए अक्षरों को स्वर और व्यंजन में बाँटो: अ, क, इ, ग, उ, त, ए, प सही विकल्प चुनो (✓): (a) ‘क’ है — (स्वर / व्यंजन) (b) ‘ए’ है — (स्वर / व्यंजन) खाली स्थान भरो: हिंदी में कुल ______ स्वर होते हैं। Section B – शब्द ज्ञान (15 Marks) विलोम शब्द लिखो: (a) दिन → ______ (b) बड़ा → ______ (c) अच्छा → ______ (d) ऊपर → ______ समानार्थी शब्द लिखो: (a) जल → ______ (b) घर → ______ (c) मित्र → ______ शब्दों को मिलाओ: शब्द अर्थ सूर्य घर मकान सूरज मित्र दोस्त Section C – व्याकरण (10 Marks) संज्ञा पहचानो (रेखांकित करो): (a) राम खेल रहा है। (b) सीता स्कूल जाती है। लिंग बदलो: (a) लड़का → ______ (b) राजा → ______ वचन बदलो: (a) बच्चा → ______ (b) किताब → ______ Section D – वाक्य निर्माण (10 Marks) दिए गए शब्दों से वाक्य बनाओ: (a) पेड़ → __________________ (b) बच्चा → ________________ (c) फूल → __________________ व...

Date: 17 April 2026 Worksheet - 1(Science) Chapter 1: Crop Production and Management Section A – Objective Type Questions (1 × 8 = 8 marks) Q1. Multiple Choice Questions (MCQs) Choose the correct option: Which of the following is a Kharif crop? a) Wheat b) Gram c) Paddy d) Mustard The process of loosening the soil is called: a) Sowing b) Ploughing c) Irrigation d) Harvesting Which of the following is used to remove weeds? a) Hoe b) Sickle c) Seed drill d) Sprayer Which irrigation method saves water? a) Canal b) Flood c) Drip d) Tank Q2. Assertion–Reason Questions Assertion (A): Manure improves soil fertility. Reason (R): It adds organic matter to the soil. Assertion (A): Weeds should be removed regularly. Reason (R): They compete with crops for sunlight and nutrients. (Choose correct option: a/b/c/d as per CBSE pattern) Q3. Very Short Answer (1 mark each) What is harvesting? Name one traditional method of irrigation. Section...