Science

Question: What is heat? Answer: Heat is a form of energy, entry or exit of which correspondingly increases or decreases internal energy of a body when no work is done on the body or by the body. Question: What is temperature? Answer: The degree of hotness and coldness of a body is called temperature of body. Thermometer …

NCERT 7th Class (CBSE) Science: Chemical and Chemical Changes – Quiz 28 Multiple Choice Questions related to NCERT 7th Class (CBSE) Science: Chemical and Chemical Changes – Quiz: Physical Change: A physical change is a change in which no new substance is formed. Chemical Change: Those changes in which new substances are …

Question: Define the following: Valency, Atomicity, Chemical Equation, Rusting, Galvanization, Crystallization. Answer: Definitions are as follows: Valency: The combining capacity of atoms of an element with the atoms of other elements is known as valency. Atomicity: The number of atoms that make up a molecule of an element is known …

Question: Name the five main components of food. Answer: The five main components of food are: Carbohydrates Proteins Fats Vitamins Minerals Question: What is roughage? How does it help us? Answer: Roughage is the undigested part of the plant food. It helps in moving the food easily through our digestive …

Question: What is matter? Answer: Any substance that has mass and occupies space. Question: What is matter made up of? Answer: Matter is made up of very small particles. Question: What makes liquids take the shape of the container they are poured in? Answer: Liquids take the shape of the …

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 …