Tag Archives: NCERT Books Online Solutions

Question: What is skeletal system? Answer: The skeletal system is the framework of bones that gives support to our body. Question: Describe the different parts of the skeleton system. Answer: The different parts of the skeleton system are: Skull: The skull acts like a helmet and protect the brain. Rib …

Question: Name the three layers of the earth. Answer: The three layers of the earth are: Crust Mantle Core – Outer core, Inner core Question: Name the three types of rocks with one example each. Answer: The three types of rocks are: Igneous rock – pumice Sedimentary rock – shale Metamorphic rock …

Question: Name any three causes of fire. Answer: The three causes of fire are: Carelessness while handling burning match sticks, candles etc. Electric faults Gas leakage Question: Why should we not operate any electrical switches when there is a gas leak? Answer: We should not operate any electrical switches when …

Question: What is length? Answer: The size or the measurement of something from one end to the other is called length. Question: Name any two measures used in ancient times? Answer: The two measures used in ancient times are: Handspan Cubit Question: Why did people in ancient times realize the …

Question: What is force? Answer: A push or pull acting on an object is called force. Question: What is gravity? Answer: The force that attracts objects towards the center of the earth is called gravity. Question: What is magnetism? Answer: The push or pull applied by a magnet on metals …

Question: What is the atmosphere? Answer: Air is a layer around the earth. This layer is called the earth’s atmosphere. Question: Name the various layers of the atmosphere. Answer: The various layers of the atmosphere are: Troposhere Stratosphere Mesosphere Thermosphere Exosphere Question: How does the atmosphere protect us from meteoroid …

Question: What is a solar system? Answer: The sun and the celestial bodies that revolve around it form the solar system. Question: Apart from plants, name the other celestial bodies that are in the solar system. Answer: Apart from plants, name the other celestial bodies that are in the solar …

Question: What are volcanoes? Answer: Cracks in the earth’s crust out of which molten magma comes out is called volcanoes. Question: Name three types of volcanoes? Answer: The three types of volcanoes are: Active Volcanoes Dormant Volcanoes Extinct Volcanoes Question: Give one example each of an active and an extinct volcanoes. …

Question: What are transparent materials? Give any two examples. Answer: Materials that allow all the light to pass through them are called transparent materials. Eg: clear glass and clean water. Question: What are translucent materials? Answer: Materials that allow some amount of light through them are called translucent materials. Question: …

Question: What are natural Fibres? Answer: The fibres obtained from plants and animals are called natural fibres. For example, cotton from cotton bolls, jute from jute plant, silk from cocoon of silkworm and wool from hair of animals like sheep or goat. Question: List five animals from which wool is obtained? …