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📘 Study MCQs Q1. Why does your nose sometimes “run” when you go outside on a very cold morning? A. Because the cold air freezes the mucus B. Because the nasal cavity produces extra mucus to warm and moisten the very cold, dry air C. Because the nose is trying to sneeze D. Because the […]

📘 Study MCQs Q1. What is the first part of the human respiratory system that air enters through the nose? A. Trachea B. Nasal cavity C. Bronchi D. Alveoli AnswerB. Nasal cavityDetails When you breathe in through your nose, air first enters the nasal cavity. This is the hollow space behind your nostrils. It is

📘 Study MCQs Q1. Why do living organisms respire? A. To produce food B. To release energy from food C. To absorb carbon dioxide D. To digest nutrients AnswerB. To release energy from foodDetails Respiration is a vital process because it breaks down food molecules like glucose to release energy. This energy is needed for

📘 Study MCQs Q1. Why do dogs stick their tongue out and pant on a hot day? A. To make a loud sound B. To cool down their body C. To taste the air D. To show they are angry AnswerB. To cool down their bodyDetails Dogs do not sweat much; they release heat by

📘 Study MCQs Q1. The slow process in which iron reacts with oxygen and moisture from the air to form a reddish-brown substance is called: A. Galvanisation B. Rusting C. Crystallisation D. Alloy formation AnswerB. RustingDetails Rusting is a chemical change that occurs only in iron and its alloys (like steel). When iron comes in

📘 Study MCQs Q1. The process in which a substance undergoes a change in its physical properties without forming a new substance is called: A. Chemical change B. Physical change C. Rusting D. Burning AnswerB. Physical changeDetails A physical change affects only the physical properties of a substance, such as shape, size, colour, or state

📘 Study MCQs Q1. What is the main driving force for the transport of water in plants? A. Root pressure only B. Transpiration pull created by loss of water vapor from leaves C. Diffusion of carbon dioxide into leaves D. Pumping action of the heart in plants AnswerB. Transpiration pull created by loss of water

📘 Study MCQs Q1. What happens when copper powder is heated in air? CBSE 2026 A. It melts. B. It turns white. C. Its surface gets coated with black copper(II) oxide. D. It evaporates. AnswerC. Its surface gets coated with black copper(II) oxide.Details When copper powder is heated in the presence of air (oxygen), it

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