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NCERT 8th Class (CBSE) Science: Pollution of Water and Air – Quiz

Pollution

NCERT 8th Class (CBSE) Science: Pollution of Water and Air – Quiz 23 Multiple Choice Questions related to NCERT 8th Class (CBSE) Science: Pollution of Water and Air – Quiz: Water is renewed continuously in nature through the water cycle. Water containing harmful impurities is said to be polluted. Pollution occurs ...

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NCERT 8th Class (CBSE) Science: Pollution of Water and Air

Pollution

Question: What harm can dumping of untreated sewage into a river cause? Answer: Untreated sewage from homes is often disposed off into rivers. These wastes contain many harmful microorganisms – bacteria, viruses, fungi and parasites that cause diseases such as diarrhoea, dysentery, cholera, typhoid and jaundice. Question: Why is hot water ...

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NCERT 8th Class (CBSE) Science: Chemical Effects of Electric Current – Quiz

Electricity

NCERT 8th Class (CBSE) Science: Chemical Effects of Electric Current – Quiz 23 Multiple Choice Questions related to NCERT 8th Class (CBSE) Science: Chemical Effects of Electric Current – Quiz: The flow of electrons constitutes an electric current. Conventional current flows from positive to negative terminal; electronic current lows from negative ...

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NCERT 8th Class (CBSE) Science: The Universe – Quiz

Universe

NCERT 8th Class (CBSE) Science: The Universe – Quiz 26 Multiple Choice Questions related to NCERT 8th Class (CBSE) Science: The Universe – Quiz: The universe comprises everything that exists, which includes stars, planets, moons, other celestial objects, everything that exists on these celestial objects, as well as the vast empty ...

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NCERT 8th Class (CBSE) Science: Refraction and Dispersion of Light – Quiz

Light

NCERT 8th Class (CBSE) Science: Refraction and Dispersion of Light – Quiz 20 Multiple Choice Questions related to NCERT 8th Class (CBSE) Science: Refraction and Dispersion of Light – Quiz: The bending of light as it passes from one transparent medium to another is called refraction. It occurs because light travels at ...

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NCERT 8th Class (CBSE) Science: The Universe

Universe

Question: While looking up at the sky, how can you distinguish between a planet and a star? Answer: While looking up at the sky, we can distinguish between a planet and a star by observing their twinkling nature. Stars twinkle at night sky whereas planets do not. Question: What is the ...

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NCERT 8th Class (CBSE) Science: Refraction and Dispersion of Light

Light

Question: What do you mean by refraction of light? In which direction will light bend when travelling from an optically rarer medium to an optically denser medium? Answer: The bending of light as it passes from one transparent medium to another is called refraction. It occurs because light travels at lower ...

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NCERT 8th Class (CBSE) Science: Chemical Effects of Electric Current

Electricity

Question: What is electric current? Answer: The flow of electrons constitutes an electric current. Question: How is electronic current different from conventional current? Answer: The flow of electronic current is from negative to positive whereas the flow of conventional current is from positive to negative. Question: Differentiate between conductors and insulators. Answer: Difference is as ...

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NCERT 8th Class (CBSE) Science: Light – Quiz

Light

NCERT 8th Class (CBSE) Science: Light – Quiz 26 Multiple Choice Questions related to NCERT 8th Class (CBSE) Science: Light – Quiz: When a beam of light falls on a smooth surface it gets reflected in one direction. This is called regular reflection. When a beam of light falls on ...

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NCERT 8th Class (CBSE) Science: Light

Light

Question: What is reflection of light? Answer: The objects send back the light which falls on them. This sending back of light by objects is called reflection of light. Question:What is the second law of reflection? Answer: The second law of reflection states that the incident ray, the normal and the ...

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