Skip to content
  • Home
  • Physics
    • First Year
    • First Year (New)
    • Second Year
    • Second Year (New)
  • Food Recipes
  • Mehndi Designs
  • Blog
  • Showbiz Profiles
  • AIOU Papers
  • Contact Us
  • Facebook
  • Twitter
  • Pinterest
  • Youtube
  • Instagram

Home » Physics » First Year » Chapter One - Measurements

Chapter One – Measurements

This is the chapter One of the first year book. which is called Measurements, deals with the physical quantities and their measurements.

In our physical world, most basic quantities are length,mass and time. Also there are quantities,which can be described in base quantities,called derived quantities.

International System (SI) of Units is a internationally adopted system of units.It consists of seven base units,two supplementary units and several derived units.

Errors may occur while taking any measurement.There are two types of error.An error due to unknown cause is random error and the error due to measuring instrument is called systematic error.

The reasonably reliable digits are called significant figures.

The extent to which systematic error make a measured value differ from its true value is called accuracy of a measurement.
Dimension is the qualitative nature of the physical quantity.Dimension of each base quantity is denoted by a specific symbol written within square brackets.Other physical quantities (such as derived quantities) also have dimensions which are combination of basic ones.

  • Multiple Choice Questions (MCQs)

  • Q 1.1. A light year is the distance light travels in one year. How many meters are there in one light year: (speed of light=3.0 x 10^8m/s).

  • Q 1.2.a) How many seconds are there in 1 year? b) How many nanoseconds in 1 year? c) How many years in one second?

  • Q 1.3. The length and width of a rectangular plate are measured to be 15.3 cm and 12.80 cm, respectively.Find the area of the plate.

  • Q 1.4. Add the following masses given in kg upto appropriate precision. 2.189, 0.089, 11.8 and 5.32.

  • Q 1.5. Find the value of ‘g’ and its uncertainty using T = 2π√(l/g) from the following measurements made during an experiment Length of simple pendulum l=100 cm Time for 20 vibrations=40.2 s Length was measured by a meter scale of accuracy up to 1 mm and time by stop watch of accuracy up to …

  • Q 1.6. What are the dimensions and units of gravitational constant G in the formula F=G(m1 m2)/r^2

  • Q 1.7. Show that the expression vf=vi+at is dimensionally correct,where vi is the velocity at t=0, a is acceleration and vf is the velocity at time t.

  • Q 1.8. The speed v of sound waves through a medium may be assumed to depend on (a)the density ρ of the medium and (b)its modulus of elasticity E which is the ratio of stress to strain.Deduce by the method of dimensions, the formula for the speed of sound.

  • Q 1.9. Show that the famous “Einstein equation” E=mc^2 is dimensionally consistent.

  • 1
  • 2
  • »
Recent Posts
  • Mashal Khan
  • 10 Things to Keep in Mind for FSC Board Exams in Pakistan
  • 10 Basic Tips for Logo Designing
  • Meredith Garretson
  • Pakistani Breakfast Delights: Nihari, Paratha, and the Morning Feast
Physics
  • First Year
  • First Year (New)
  • Second Year
  • Second Year (New)
Facebook page
Facebook page
Popular Tags
Autumn 2018 B.Ed Papers Cake chequered pattern mehndi design Chicken circular motif mehndi design Dog Dog Breed First Semester floarl mehndi design Mehndi Designs Photoshop Rice Second Semester Technology Third Semester Vegan Recipes wordpress
  • Home
  • Physics
  • Mehndi Designs
  • Food Recipes
  • Blog
  • Showbiz Profiles
  • AIOU Papers
  • Contact Us
© 2025 thelearningparadise.com. All Rights Reserved
  • Facebook
  • Twitter
  • Pinterest
  • Youtube
  • Instagram