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Science Questions and Answers — Earth, Moon and Sun Science Questions and Answers Earth, Moon and Sun Question 1 In Fig. 12.17, how many hours of Sunlight do the North Pole and the South Pole receive during one rotation of the Earth? Answer: During one rotation of the Earth (24 hours), both the North Pole and South Pole receive 24 hours of sunlight or 24 hours of darkness, depending on the season due to Earth's tilted axis. Question 2 — Fill in the blanks (i) Stars rise in the _______ and set in the _______. (ii) Day and night are caused by the Earth's _______. (iii) When the Moon fully covers the Sun from our view, it is called a _______ solar eclipse. Answer: (i) Stars rise in the east and set in the west. (ii) Day and night are caused by the Earth's rotation. (iii) When the Moon fully covers the Sun from our view, it is called a total solar eclipse. Question 3 — ...

Class 7 Science — Light and Shadows (Q & A) Class 7 Science Light and Shadows — Questions & Answers 1. Which of the following are luminous objects? Mars, Moon, Pole Star, Sun, Venus, Mirror Answer: Sun and Pole Star are luminous objects because they make their own light. Others are non-luminous objects. 2. Match the items in Column A with those in Column B. Column A Column B Pinhole camera Blocks light completely Opaque object The dark region formed behind the object Transparent object Forms an inverted image Shadow Light passes almost completely through it Correct Matching: • Pinhole camera → Forms an inverted image • Opaque object → Blocks light completely • Transparent object → Light passes almost completely through it • Shadow → The dark region formed behind the object 3. Sahil, Rekha, Patrick, and Qasima are trying to observe the candle flame through the pipe as shown in Fig....

Class 7 Science – Photosynthesis & Respiration Q-A Class 7 Science – Questions & Answers 1 Complete the following table S.No. Feature Photosynthesis Respiration 1 Raw materials Carbon dioxide and water Glucose and oxygen 2 Products Glucose and oxygen Carbon dioxide and water 3 Word equation CO₂ + H₂O → Glucose + O₂ Glucose + O₂ → CO₂ + H₂O 4 Importance Makes food for plants Releases energy for life processes 2 Imagine a situation where all the organisms that carry out photosynthesis on the earth have disappeared. What would be the impact of this on living organisms? Oxygen levels would plummet while carbon dioxide would skyrocket. With no breathable oxygen and no food production, animals and humans would ult...

Class 7 Science – Motion, Distance and Speed (Worksheet with Answers) Class 7 – Motion, Distance and Speed (Worksheet with Solutions) Question 1 Calculate the speed of a car that travels 150 metres in 10 seconds. Express your answer in km/h. • Speed = Distance ÷ Time = 150 ÷ 10 = 15 m/s • In km/h: 15 × 3.6 = 54 km/h Question 2 A runner completes 400 metres in 50 seconds. Another runner completes the same distance in 45 seconds. Who has a greater speed and by how much? • Runner A = 400 ÷ 50 = 8 m/s • Runner B = 400 ÷ 45 ≈ 8.89 m/s • Difference = 8.89 − 8.00 = 0.89 m/s . Runner B is faster. Question 3 A train travels at a speed of 25 m/s and covers a distance of 360 km. How much time does it take? • Convert speed to km/h: 25 × 3.6 = 90 km/h • Time = Distance ÷ Speed = 360 ÷ 90 = 4 hours Question 4 A train travels 180 km in 3 h. Find its speed in: (i) km/h (ii) m/s (iii) What distance will it travel in 4 h if it maintains the same speed througho...

Grade-7 Worksheet: Motion, Distance & Speed Motion, Distance & Speed – Solved Numericals Question 1 A car moves 150 m in 10 s . What is its speed in kilometres per hour (km/h)? Click for solution Formula → Speed = Distance ÷ Time Put numbers → 150 m ÷ 10 s = 15 m/s Convert → 1 m/s = 3.6 km/h 15 m/s × 3.6 = 54 km/h Speed = 54 km/h Question 2 Runner A covers 400 m in 50 s. Runner B covers 400 m in 45 s. (a) Find each runner’s speed. (b) Who is faster and by how much? Click for solution Runner Calculation Speed (m/s) A 400 m ÷ 50 s 8 B 400 m ÷ 45 s 8.89 Runner B is faster by 0.89 m/s (≈3.2 km/h). Question 3 A train runs at 25 m/s . How long will it take to cover 360 km ? Click for solution Convert speed → 25 m/s × 3.6 = ...

Class 7th Heat Transfer in Nature Class 7 Heat Transfer in Nature 1. Choose the correct option in each case (i) Your father bought a saucepan made of two different materials, A and B. Which statement is right? Both A and B are good conductors Both A and B are poor conductors A is a good conductor, B is poor A is poor, B is good Answer (c) — The metal base (A) passes heat quickly; the handle (B) stays cool. (ii) Four pins (I, II, III, IV) are stuck by wax on a metal strip held over a candle. What happens? All pins fall almost together Pins I and II fall earlier than III, IV Pins I and II fall later than III, IV Pins II and III fall almost at the same time Answer (d) — Pins II and III fall almost at the same time. (iii) Where should a smoke detector be fixed in a room? Near the floor Mid-wall On the ceiling An...