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Sometimes, a crackling sound is heard while taking off a sweater during winters. Explain. cbse-class8-physics-20151 AnswerThe sound from a mosquito is produced when it vibrates its wings at an average rate of 500 vibrations per second. What is the time period of the vibration? cbse-class8-physics-20151 AnswerLightning and thunder take place in the sky at the same time and at the same distance from us. Lightning is seen earlier and thunder is heard later. Can you explain why? cbse-class8-physics-20151 AnswerIn the following statements, tick T against those which are true, and F against those which are false cbse-class8-physics-20151 AnswerPaheli had heard that rain water is as good as distilled water. So, she collected some rain water in a clean glass tumbler and tested it using a tester. To her surprise, she found that the compass needle showed deflection. What could be the reasons? cbse-class8-physics-20151 AnswerA police car with a siren of frequency 8 kHz is moving with uniform velocity 36 km/hr towards a tall building which reflects the sound waves. The speed of sound in air is 320 m/s. The frequency of the siren heard by the car driver is - jee main 2012 physics 1 AnswerFill in the blanks with suitable words. cbse-class8-physics-20151 AnswerIdentify the part which vibrates to produce sound in the following instruments. cbse-class8-physics-20151 AnswerGurmit wanted to perform Activity 16.8 using a laser torch. Her teacher advised her not to do so. Can you explain the basis of the teachers advice? cbse-class8-physics-20151 AnswerWhen the free ends of a tester are dipped into a solution, the magnetic needle shows deflection. Can you explain the reason? cbse-class8-physics-20151 AnswerIn case of a fire, before the firemen use the water hoses, they shut off the main electrical supply for the area. Explain why they do this. cbse-class8-physics-20151 AnswerIs it safe for the electrician to carry out electrical repairs outdoors during heavy downpour? Explain. cbse-class8-physics-20151 AnswerThe weather department has predicted that a thunderstorm is likely to occur on a certain day. Suppose you have to go out on that day. Would you carry an umbrella? Explain. cbse-class8-physics-20151 AnswerExplain why objects moving in fluids must have special shapes. cbse-class8-physics-20151 AnswerExplain why a charged body loses its charge if we touch it with our hand. cbse-class8-physics-20151 AnswerSketch larynx and explain its function in your own words. cbse-class8-physics-20151 AnswerExplain how you can locate the Pole Star with the help of Ursa Major. cbse-class8-physics-20151 AnswerWhy there is difference in sound on dropping a metal coin and a piece of coal? cbse-class8-chemistry-20151 AnswerA child staying in a coastal region tests the drinking water and also the seawater with his tester. He finds that the compass needle deflects more in the case of seawater. Can you explain the reason? cbse-class8-physics-20151 AnswerExplain in what way noise pollution is harmful to humans. cbse-class8-physics-20151 Answer