NCERT (Chemistry) Class-VIII
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| ChemistryDate Added: 2022-05-20 Which of the following are correct? 1. Polymer----------long chain molecule 2. Synthetic fibre------man-made fibre 3. Nonbiodegradable--------decompose to harmless substances. Which of the above are correct? | ||
| ChemistryDate Added: 2022-05-20 Which of the following is/are correct about polymers? 1. It is a long chain like unit consisting of a large number of smaller molecules. 2. Smaller molecules are monomers. 3. Polymers are natural. Which of the above statements are correct? | ||
| ChemistryDate Added: 2022-05-20 Which of the following is/are correctly matched: 1. Rayon------used in textile industry 2. Nylon-----used for making fishing nets 3. Polyester-------used for manufacture of tyre cords. Which of the above are correct? | ||
| ChemistryDate Added: 2022-05-20 Which of the following is/are correct of synthetic fibres? 1. They do not get wet. 2. They are not durable. 3. They are cheaper. Which of the above statements are correct? | ||
| ChemistryDate Added: 2022-05-20 Which of the following statements is/are correct for thermoplastics? 1. They are long chain polymer with cross-linking. 2. They can be processed repeatedly. 3. Polyethene, PVC are examples of thermoplastics. Which of the above statements are correct? | ||
| ChemistryDate Added: 2022-05-20 Which of the following are correctly matched? 1. Polyethene-----------thermoplastic polymer. 2. Bakelite--------------thermosetting plastic 3. Melamine-------------thermosetting polymer. | ||
| ChemistryDate Added: 2022-05-20 Which of the following are correctly matched? 1. Metals-------------lead, arsenic 2. Non-metals-----------carbon, sulphur 3. Metalloids--------boron, silicon | ||
| ChemistryDate Added: 2022-05-20 Which of the following is/are correct for metals? 1. They are solids 2. They have metallic lustre. 3. They are hard except sodium and gallium. Which of the above are correct: | ||
| ChemistryDate Added: 2022-05-20 Which of the following are correctly matched? 1. Graphite------------good conductor 2. Caesium-----------high melting point. 3. Diamond------------hardest substance. | ||
| ChemistryDate Added: 2022-05-20 The reaction Zinc + copper sulphate solution' zinc sulphate solution + copper indicates that the metal which is placed lower in the reactivity series is | ||
| ChemistryDate Added: 2022-05-20 Which of the following are correctly matched? 1. Sulphur-----------manufacture of gun powder. 2. Phosphorus----------manufacture of matchsticks. 3. Oxygen--------------supporter of combustion. 4. Hydrogen------------for sterilizing water. | ||
| ChemistryDate Added: 2022-05-20 Which of the following are correctly matched : 1. Coke--------pure form of carbon. 2. Coal tar------black, thin liquid. 3. Coal gas-----manufacturing perfumes. | ||
| ChemistryDate Added: 2022-05-20 Which of the following are correctly matched? 1. Petrol-----motor fuel 2. Bitumen--------paints 3. Paraffin wax----lubrication | ||
| ChemistryDate Added: 2022-05-20 Consider the following statements for Natural Gas 1. It is easy to transport through pipes. 2. It is used as a starting material for the manufacture of a number of chemicals and fertilisers. 3. Natural gas has been found in Tripura, Rajasthan, Maharashtra and in the Krishna Godavari delta. Which of the following statements are correct ? | ||
| ChemistryDate Added: 2022-05-20 Consider the following statements for CNG: 1. Natural gas is stored under high pressure as Compressed Natural Gas (CNG). 2. It is a cleaner fuel. 3. It can be used directly for burning (–) in homes and factories. Which of the following statements are correct? | ||
| ChemistryDate Added: 2022-05-20 Consider the following statements for tips of the Petroleum Conservation Research Association : 1. Drive at a constant and moderate speed as far as possible. 2. Ensure regular maintenance of the vehicle. 3. Ensure correct tyre pressure. Which of the following statements are correct. | ||
| ChemistryDate Added: 2022-05-20 Which of the following is/are true for ignition temperature? 1. It is the lowest temperature. 2. Its depends on physical nature. 3. It is also called kindling temperature. Which of the above is/are correct. | ||
| ChemistryDate Added: 2022-05-20 Consider the following statements for carbon dioxide in fire extinguisher : 1. It is lighter than oxygen. 2. It does not harm the electrical equipment. 3. Carbon dioxide (CO2 ) is the best extinguisher. Which of the following statements are correct ? | ||
| ChemistryDate Added: 2022-05-20 Which of the following are correctly matched? 1. Rapid combustion------produces heat and light 2. Spontaneous combustion-----phosphorus 3. Explosion-------------coal dust | ||
| ChemistryDate Added: 2022-05-20 Which of the following are correctly matched for a candle? 1. Innermost zone-------black 2. Middle zone------------red 3. Outermost zone-------blue | ||
| ChemistryDate Added: 2022-05-20 Which of the following is the correct order of calorific value? | ||