# Question and Answers: newton

1. Newton’s law of cooling is also applicable to

 Convection losses Natural convection losses Forced convection losses None of the above

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2. A body cools from 60°C to 50°C in 10 minutes. If the room temperature is 25°C and assuming Newton’s law of cooling to hold good, the temperature of the body at the end of the next 10 minutes will be

 38.5°C 40°C 42.85°C 45°C

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3. SI unit of Impulse is

 Newton metre Joule second Newton Second Joule metre

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4. When a train starts suddenly, the passengers bends backwards- it is an example of

 Keplers Law Pascals Law Newtons Third Law Newtons First Law

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5. Which one of the following law of Newton is called as law of galileo

 Newtons Third Law Newtons Second Law Newtons First Law None of the above

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6. Which one of the following is an derived SI unit ?

 Kilogram Candela Mole Newton

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7. Who is called as father of physics` ?

 Galilio Plato Einstein Newton

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8. Who propounded the universal law of gravitation

 Galileo Copernicus Newton Kepler

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9. Plancks constant (h), speed of light in vacuum (c) and Newtons gravitational constant (G) are three fundamental constants. Which of the following combinations of these has dimension of length?

 $\sqrt{\dfrac{Gc}{h^{3/2}}}$ $\dfrac{\sqrt{hG}}{c^{3/2}}$ $\dfrac{\sqrt{hG}}{c^{5/2}}$ $\sqrt{\dfrac{hc}{G}}$

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10. A body cools from a temperature 3T to 2T in 10 minutes. The room temperature is T. Assume that Newtons law of cooling is applicable. The temperature of the body at the end of next 10 minutes will be

 T $\dfrac{7}{4}$T $\dfrac{3}{2}$T $\dfrac{4}{3}$T

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11. விசையின் அலகு?

 Newton Joule newton joule.

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12. Newton’s law of cooling is also applicable to

 Convection losses Natural convection losses Forced convection losses None of the above

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13. A body cools from 60°C to 50°C in 10 minutes. If the room temperature is 25°C and assuming Newton’s law of cooling to hold good, the temperature of the body at the end of the next 10 minutes will be

 38.5°C 40°C 42.85°C 45°C

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14. A body cools from 100°C to 70°C in 8 minutes. If the room temperature is 15°C and assuming Newton’s law of cooling holds good, then time required for the body to cool from 70°C to 40°C is

 14 s 10 s 8 s 5 s

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