CBSE Board Students Helpline

Question 1: Why does a compass needle get deflected when brought near a bar magnet? A compass needle is a small bar magnet. When it is brought near a bar magnet, its magnetic field lines interact with that of the bar magnet. Hence, a compass needle shows a deflection when brought near the bar magnet.   Question 1: Draw magnetic field lines around a bar magnet. Magnetic field lines of a bar magnet emerge from the north pole and terminate at the south pole. Inside the magnet, the field lines emerge from the south pole and terminate at the north pole, as shown in the given figure. Question 2: List the properties of magnetic lines of force. The properties of magnetic lines of force are as follows. (a) Magnetic field lines emerge from the north pole. (b) They merge at the south pole. (c) The direction of field lines inside the magnet is from the south pole to the north pole. (d) Magnetic lines do not intersect with each other. Question 3: Why don’t two magnetic lines of force intersect each...

Management of Natural Resources     Question 1: What changes can you make in your habits to become more environment-friendly? We should switch off the electrical appliances when not in use. Water and food should not be wasted. Close the tap when not in use. Dump the objects made of plastic and glass in designated recycling boxes. Plastic, paper, or glass must be recycled or reused and not dumped with other wastes. This is because objects made of plastic do not get decomposed easily. Besides soil fertility, they badly affect our environment. We should dispose the wastes safely and not disperse in public places. These are a few things that can be done to become more environment- friendly. Question 2: What would be the advantages of exploiting resources with short-term aims? There should be a judicious use of natural resources as they are limited in nature. We should not exploit resources for our short term gains as this would only lead to depletion of natural resources for the present ge...

Management of Natural Resources     Question 1: What changes can you make in your habits to become more environment-friendly? We should switch off the electrical appliances when not in use. Water and food should not be wasted. Close the tap when not in use. Dump the objects made of plastic and glass in designated recycling boxes. Plastic, paper, or glass must be recycled or reused and not dumped with other wastes. This is because objects made of plastic do not get decomposed easily. Besides soil fertility, they badly affect our environment. We should dispose the wastes safely and not disperse in public places. These are a few things that can be done to become more environment- friendly. Question 2: What would be the advantages of exploiting resources with short-term aims? There should be a judicious use of natural resources as they are limited in nature. We should not exploit resources for our short term gains as this would only lead to depletion of natural resources for the present ge...