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Explain why, big boulders can be moved easily by flood.
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An iron nail sinks in water but it floats in mercury. Why ?
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Explain why, a piece of glass sinks in water but it floats in mercury.
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Steel sinks in water but a steel boat floats. Why ?
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Why does a ship made of iron and steel float in water whereas a small piece of iron sinks in it ?
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Name the force the upward push of water on a submerged object .
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A beaker full of water is suspended from a spring balance. Will the reading of the balance change if a cork is placed in water ?
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A beaker full of water is suspended from a spring balance. Will the reading of the balance change if a piece of heavy metal is placed in it ?
Give reasons for your answer.
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A boy get into a floating boat .
What happens to the boat ?
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A `1/2` kg sheet of tin sinks in water but if the same sheet is converted into a box or boat, it floats. Why?
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Name the Following:
Smallest Cell Organelle
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A car of mass 1000 kg is moving with a velocity of 10 m s−1. If the velocity-time graph for this car is a horizontal line parallel to the time axis, then the velocity of car at the end of 25 s will be :
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The inertia of an object tends to cause an object :
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A water tanker filled up to `2/3` of its tank with water is running at a uniform speed. When the brakes are suddenly applied, the water in its tank would
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The inertia of a moving object depends on :
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The physical quantity which makes it easier to accelerate a small car than a large car is measured in the unit of :
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The unit of measuring momentum of a moving body is :
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A Honda City car, a Maruti Alto car, A Tata Nano car and a Mahindra Scorpio car, all are running at the same speed of 50 m/s under identical conditions. If all these cars are hit from behind with the same force and they continue to move forward, the maximum acceleration will be produced in :
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A rectangle wooden block has length, breadth and height of 50 cm, 25 cm and 10 cm, respectively. This wooden block is kept on ground in three different ways, turn by turn. Which of the following is the correct statement about the pressure exerted by this block on the ground?
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Consider the following information in respect of four objects A, B, C and D :
| Object | Density(kg/m3) | Volume(m3) | Mass(kg) |
| A | 2 | 4000 | |
| B | 8000 | 4 | |
| C | 2000 | 1000 | |
| D | 4 | 2000 |
Which object would float on water ?
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