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A man is at rest in the middle of a pond...

A man is at rest in the middle of a pond on perfectly smooth ice. He can get himself to the shore by making use of Newton's

A

First law

B

Second law

C

Third law

D

Lae of gravitation

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The correct Answer is:
C
Action `hArr` Reaction
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A person is standing stationary at middle of a frozen lake on ice. By using Newton's first law of motion he can reach to bank of lake.

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In a beautiful valley, there was a village. When trains passed from the village, the whistle and the sound of train, mixed with the sound of waterfall, seemed to be very pleasant to everyone. Hence, children of that village used to play near the railway track. Once on a very light foggy day, a group of children found that a fish plate was missing from the track. As such, all the villagers were worried. Prashant, one of the children, suddenly put his ear to the line and tried to know whether a train is coming or not. He knew a train is coming. He asked his friends to inform the railway cabin crew and he himself put off his red shirt and started running towards the train, waving his red shirt. The driver and cabin man got the alert signal in time and thus a major accident was averted. Why did Prashant use his red shirt instead of any other coloured shirts ?

A man with normal near point (25 cm) reads a book with small print using a magnifying glass : a thin convex lens of focal length 5 cm . (a) What are the closest and the farthest distances at which he can read the book when viewing through the magnifying glass ? (b) What is the maximum and the minimum angular magnifications (magnifying powers) possible using the above simple microscope ?

In a beautiful valley, there was a village. When trains passed from the village, the whistle and the sound of train, mixed with the sound of waterfall, seemed to be very pleasant to everyone. Hence, children of that village used to play near the railway track. Once on a very light foggy day, a group of children found that a fish plate was missing from the track. As such, all the villagers were worried. Prashant, one of the children, suddenly put his ear to the line and tried to know whether a train is coming or not. He knew a train is coming. He asked his friends to inform the railway cabin crew and he himself put off his red shirt and started running towards the train, waving his red shirt. The driver and cabin man got the alert signal in time and thus a major accident was averted. What moral values do you learn from Prashant ?

ALLEN -NEWTONS LAWS OF MOTION-EXERCISE-II
  1. Working of rocket or jet is based on:-

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  2. When a horse pulls a wagon, the force that causes the horse to move fo...

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  3. A man is at rest in the middle of a pond on perfectly smooth ice. He c...

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  4. A body A mass m(1) exerts a force on another body B of mass m(2) . If ...

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  5. There are three Newton's laws of motion namely I, II and III : we can ...

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  6. What would happen if gravity suddenly disappears?

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  7. Two bodies of masses 4 kg and 5kg are acted upon by the same force. If...

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  8. A jet water, whose cros section is 'a' strikes a wall making an angle ...

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  9. Action and reaction:- (For a given system) (a) Act on the two diffe...

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  10. When we kick a stone, we get hurt. Due to which one of the following p...

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  11. Ten one-rupee coins are put on top each other on a table. Each coin ha...

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  12. A mass of 6 kg is suspended by a rope of length 2m from a celling. A f...

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  13. The force exerted by the floor of an elevator on the foot of a person ...

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  14. A lift can move upward or downward. A light inextensible string fixed ...

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  15. Two blocks each having a mass m are placed as shown in the figure. The...

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  16. Two blocks of masses 2.9 kg and 1.9 kg are suspended from a rigid supp...

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  17. The pulleys and strings shown in fig are smooth and of negligible mass...

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  18. A metal sphere is a string fixed to a wall. The forces acting on the s...

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  19. A body of mass 10kg is moving with a constant velocity of 10m//s. When...

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  20. The ratio of the weight of a man in a stationary lift and when it is m...

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