## Solved conceptual questions on Measurement of First Year Physics

Q 1 | Define the number π and show that 2π radians = 360° |

Q 2 | Define the terms error, uncertainty, precision and accuracy in measurement. |

Q 3 | Explain several repetitive phenomena occurring naturally which could serve reasonable time standard. |

Q 4 | Why do we find it useful to have two units for the amount of substance, kilogram and mole? |

Q 5 | Show that the famous Einstein equation E = mc |

Q 6 | Deduce the dimensions of gravitational constant. |

Q 7 | Find the dimensions of Kinetic Energy? |

Q 8 | Give the drawbacks to use the period of a pendulum as time standard. |

Q 9 | Are radian and steradian the base units? Justify your answer. |

Q 10 | What does the word ‘micro’ signify in the words ‘microwave oven’? |

Q 11 | Density of air is 1.2 kgm |

Q 12 | An old saying is that ‘A chain is only as strong as its weakest link’. What analogous statement can you make regarding measurement. |

Q 13 | Differentiate between the following. - Light year
- Year
See answer. |

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