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

Kepler`s Law | Pascal`s Law | Newton`s Third Law | Newton`s First Law |

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

Newton`s Third Law | Newton`s Second Law | Newton`s 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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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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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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