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## SUMMATIVE ASSESSMENT 1 FOR CBSE CLASS 9 (GRAVITATION)

Find below a question bank from the chapter GRAVITATION of class 9. Portions up to the syllabus for Summative assessment 1 only is included. The answers are not published herewith. Students are advised to solve the questions and problems and post the questions which they are not able to answer properly or have some doubt […]

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## Solving problems from kinematics and friction

I just want to know how to easily solve problems related to kinematics and friction. I don’t know why i always face problem in these two topics a lot……
THANK U

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## Pseudo force and solving problems

Sir,can we solve problem without considering pseudo forces in non inertial frame?(give an example)

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## Where is electricity stored after it is generated but before it is supplied?

This question was posted by Chithraja. This is a common doubt arising naturally in the minds of children as well as adults who think. But they never ask, or if they ask the questions remain unanswered.

I will explain the question itself first. When we switch on a bulb we get the energy. But what happens to the electricity when we are not using it? Is it just wasted if we don’t use it?

Then, won’t it be better using as much of it when available rather than saving it by not using electrical appliances?

These are all associated questions which I have also asked several times.

Before I actually answer the question I am waiting for responses from visitors, students and teachers

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## Tossing a coin in a moving train.

if a man tossed a coin in a moving train and the coin fell back then in which type if motion train is moving? and how?

Answer: This shows that the train is accelerated. When the coin was thrown, it had the same velocity of the train. If the train was not accelerated, the coin would have fallen on to the hands of the man itself. But the accelerated train moves a greater horizontal distance than by the coin.

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## A too simple question paper from Physics (Magnetic effects of current and magnetism) for class XII

If you find these question easy to answer, well and good. If you don’t, please revise these portions thoroughly. These are based on just the minimum level of learning expected from a Class XII student. State Gauss theorem in magnetism. Define the terms retentivity and coercivity. Which direction will a magnetic compass show when it […]

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