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Phases of the Moon occur because 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 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 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 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 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 AnswerSuppose your writing desk is tilted a little. A book kept on it starts sliding down. Show the direction of frictional force acting on it. cbse-class8-physics-20151 AnswerDescribe an activity to show that the incident ray, the reflected ray and the normal at the point of incidence lie in the same plane cbse-class8-physics-20151 AnswerDraw sketches to show the relative positions of prominent stars in (a) Ursa Major and (b) Orion cbse-class8-physics-20151 AnswerA pendulum oscillates 40 times in 4 seconds. Find its time period and frequency. cbse-class8-physics-20151 AnswerGive two examples each of situations in which you push or pull to change the state of motion of objects. cbse-class8-physics-20152 AnswerIs it safe for the electrician to carry out electrical repairs outdoors during heavy downpour? Explain. cbse-class8-physics-20151 AnswerWhy does the increased level of nutrients in the water affect the survival of aquatic organisms? cbse-class8-physics-20151 Answer Give two examples of situations in which applied force causes a change in the shape of an object. cbse-class8-physics-20151 AnswerIn which part of the sky can you find Venus if it is visible as an evening star? cbse-class8-physics-20151 AnswerExplain why objects moving in fluids must have special shapes. cbse-class8-physics-20151 AnswerHow many images of a candle will be formed if it is placed between two parallel plane mirrors separated by 40 cm? cbse-class8-physics-20151 AnswerDoes pure water conduct electricity? If not, what can we do to make it conducting? cbse-class8-physics-20151 AnswerSometimes, a crackling sound is heard while taking off a sweater during winters. Explain. cbse-class8-physics-20151 AnswerExplain why a charged body loses its charge if we touch it with our hand. cbse-class8-physics-20151 Answer