Home
Class 11
PHYSICS
Precise measurements of physical quantit...

Precise measurements of physical quantities are a need of science. For example, to ascertain the speed of an aircraft, one must have an accurate method to find its positions at closely separated instants of time. This was the actual motivation behind the discovery of radar in World War II. Think of different examples in modern science where precise measurements of length, time, mass etc. are needed. Also, wherever you can, give a quantitative idea of the precision needed.

Promotional Banner

Topper's Solved these Questions

Similar Questions

Explore conceptually related problems

What is measurement of a physical quantity?

What is the difference between accurate and precise measurement?

Name four basic quantities that need measurements .

What is the need of measurement?

Name the physical quantity which is measured in weber ampere^(-1) .

Give an example of a physical quantity which has a unit but no dimensions.

Give an example of a physical quantity which has neither unit nor dimensions.

PSEB-UNITS AND MEASUREMENT-Exercise
  1. A famous relation in physics relates ‘moving mass’ m to the ‘rest mass...

    Text Solution

    |

  2. The unit of length convenient on the atomic scale is known as an angst...

    Text Solution

    |

  3. One mole of an ideal gas at standard temperature and pressure occupies...

    Text Solution

    |

  4. Explain this common observation clearly : If you look out of the windo...

    Text Solution

    |

  5. The nearest star to our solar system is 4.29 light years away. How muc...

    Text Solution

    |

  6. Precise measurements of physical quantities are a need of science. For...

    Text Solution

    |

  7. Just as precise measurements are necessary in science, it is equally i...

    Text Solution

    |

  8. Just as precise measurements are necessary in science, it is equally i...

    Text Solution

    |

  9. Just as precise measurements are necessary in science, it is equally i...

    Text Solution

    |

  10. Just as precise measurements are necessary in science, it is equally i...

    Text Solution

    |

  11. The Sun is a hot plasma (ionized matter) with its inner core at a temp...

    Text Solution

    |

  12. When the planet Jupiter is at a distance of 824.7 million kilometers f...

    Text Solution

    |

  13. A man walking briskly in rain with speed v must slant his umbrella for...

    Text Solution

    |

  14. It is claimed that two cesium clocks, if allowed to run for 100 years,...

    Text Solution

    |

  15. Estimate the average mass density of a sodium atom assuming its size t...

    Text Solution

    |

  16. The unit of length convenient on the nuclear scale is a fermi : 1 f = ...

    Text Solution

    |

  17. A LASER is a source of very intense, monochromatic, and unidirectional...

    Text Solution

    |

  18. A SONAR (sound navigation and ranging) uses ultrasonic waves to detect...

    Text Solution

    |

  19. Hie farthest objects in our Universe discovered by modern astronomers ...

    Text Solution

    |

  20. Agreat physicist of this century (RA.M. Dirac) loved playing with nume...

    Text Solution

    |