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The value of the atmospheric pressure at sea level is
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One atmosphere is equivalent to 1,00,000 newton force acting on one square metre.
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Why is it not advisable to use a fountain pen while travelling in an aeroplane?
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The mirror used by the ophthalmologist to examine the eye is _______.
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Match the following.
| Convex mirror | Radio telescopes |
| Parobolic mirror | Rear – view mirror |
| Snell’s law | Kaleidoscope |
| Dispersion of light | sin i/sin r =μ |
| Refractive index | Rainbow |
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Give any two applications of a concave and convex mirror.
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Explain the images formed by a concave mirror.
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The shape of the Earth’s magnetic field resembles that of an imaginary ______.
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The Sun and the celestial bodies form Solar system.
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The propellant of a rocket is only in the form of solids.
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Explain the parts of a rocket.
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The liquid metal used in thermometers is
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Mention any three compounds that exist in liquid state.
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Burning of matchstick is an example for chemical reaction caused by _______
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_______ undergoes rusting.
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Which of the following factor induces electrtolysis?
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In Haber’s process of producing ammonia _______ is used as a catalyst.
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