Chapter 1 – Physical Quantities & Measurement

Chapter 1 – Physical Quantities & Measurement

Chapter 1 – Physical Quantities & Measurement

Chapter 1 – Physical Quantities & Measurement

Chapter 1 – Physical Quantities & Measurement

Chapter 1 – Physical Quantities & Measurement

Why do we study physics?

Ans.    The rapid progress in science during the recent years has become possible due to the discoveries and inventions in the field of Physics. Most of the technologies of our modern society throughout the world are related to Physics. In order to get knowledge about these techniques, technologies, scientific principles and to play a vital role in new discoveries and inventions we study physics.


Name any five branches of Physics.

Ans.    (i) Mechanics (ii) Heat          (iii) Sound      (iv) Light (Optics)      (v) Atomic Physics


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How can you differentiate between base and derived quantities? (GRW 2014, 2015)

Base Quantities Derived Quantities
The quantities on the basis of which other quantities are expressed are known as base quantities.


length, time, mass

All the quantities, which can be described in terms of base quantities, are known as derived quantities.


Force, area, volume, density etc


Identify the following as base or derived quantity:

Density, force, mass, speed, time, length, temperature and volume.

Base units Derived Units
Mass, time, length, temperature Density, force, speed, volume


Name five prefixes most commonly used.

    • Kilo (k) = 103
    • Mega (M) = 106
    • Micro (m) = 10–6
    • Milli (m) = 10-3
    • Nano (n) = 10-9


The Sun is one hundred and fifty million kilometers away from the Earth. Write this

(a) As an ordinary whole number.

150, 000, 000 km

(b) In scientific notation

1.5 x 108 km


Write the numbers given below in scientific notation

(a) 3000000000 ms-1

3.0 x 109 ms-1

(b) 6400000 m

6.4 x 106 m

(c) 0.0000000016 g

1.6 x 10-9 g

(d) 0.0000548 s

5.48 x 10-5


What is the least count of the Vernier Callipers?

Ans.    The difference between one small division on main scale and one vernier scale division is       0.1 mm. It is called least count of vernier callipers.


How many divisions are there on Vernier scale of vernier callipers?

Ans.    There are 10 division on Vernier scale of the vernier calipers.


Why do we use zero correction?

Ans.    We use zero correction to take a correct measurement free of error.


What is the least count of a screw gauge?

Ans.    The minimum measurement which can be taken using a screw gauge is known as its least       count. The least count of screw gauge is 0.01 mm or 0.001 cm.


What is the pitch of your laboratory screw gauge?

The pitch of laboratory screw gauge is 1mm.


Which one of the two instruments is more precise and why?

(a) Vernier calipers

(b) Screw Gauge

Screw gauge is more precise than vernier callipers because it can measure accurately up to one hundredth part of a millimeter while vernier callipers can only measure accurately up to one tenth part of a millimeter.


What is the function of balancing screws in physical balance?

The function of balancing screws is to bring the pointer at zero position on raising the beam.


On what pan we place the object and why?

We place the object on left pan and standard masses on the right pan just for the convenience of user.

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This Post Has 59 Comments

  1. Ghulam Mustafa

    Sir Assalam o alaikum

    1. Author

      Waliakum Assalam!

      1. Arhm

        Sr urdu medium m send kr dy please

    2. Adan

      Ye short question bhi De ap plzz

  2. Shafaqat ali

    Exercise me diye gaye mcqs k answers nai diye gaye why?

    1. Author

      Answers lagy huay hain.. un ka text bold(dark) hai.. mcqs k options mai hi answers hain..

  3. Sana

    Exercise k short questions q ni diye? Or ye just 1 page he show ho rha sb categories ka baqi k pages q ni show ho rhy?

    1. Author

      Reload the Page and wait a minute to load all pages.

      1. [email protected]

        Please write short questions of every chapter other than exercise questions especially physics

        1. Lect: Ali Murad Chemist:

          How I download physics nots for my brother sir?

  4. AnoUsH

    Thanks you so much for this act of kindness

    1. Inayat

      Exercise main jo MCQS diey hoy hain un ko kaise solved karen

      1. Abdullah

        Sir kindly can you let us download these notes it’s quit hard please allow to download

      2. Syed Tajwar Ahmed

        Last ma dekha Sara answers diye hua hain

  5. hisham

    there are no quic quiz

  6. Tayyab Ameen

    Your lectures and notes are very helpful for Normal student

  7. Safa Agent

    Thank you soooo much for giving us helpful notes

    1. Taimoor

      This help in when i am sick and did not attended any class

    2. Asfand

      Where can we find free ilm lectures

  8. syed muntazir

    Assalam o alaikum Thank you very much sir

  9. mano

    thank u free ilm ur website helps me alot …

  10. Hann jaya

    Assalam o alaikum sir! How can we download this ??

    1. Muhammad

      Top of every page there is blue [open] press this and new window will pop up from there you can download pdf and study

  11. rana

    sir plz uplod urdu

  12. M.Abuzar

    there is a mistake in Problem 1.5 part b answer one zero is missing

  13. Hadi Mughal

    why there are no short questions available ??????

    1. Author

      Prepare Long Q, and Exercise Q.. No need to prepare other short questions.

  14. Abdul hadi

    Sir but we need short questions of physics all chapter ,,, it is compulsory

  15. arisha

    actually sir we need model paper and lectures

  16. Malaika

    Sir there is no answer of MCQS book wale MCQS ka answer han but jo notes wale MCQS han un ke answer nai han plz give me the answers 🙏

    1. Author

      Unhi Extra MCQ’s k end py Answers bhi hain. Check.

  17. Aimen

    No quick quiz, mini exercises solutions given……… If there will be then these are the best ever notes…..

  18. Samra

    Assalamualaikum! Sir physics Kay additional short question bi ap upload kar day please please sir

  19. Muhammad Uzair

    mini exercise or box questions ka answers nhi han please add them

  20. Hafiz Ali

    Thank u so much your notes are very helpful

  21. Saad Rabbani

    Assalamoalikum every one who is reading my comment, thanks to the person who created the website, all these has really helped me.
    Special Thanks to the person who has made all the notes.

  22. Ayesha Ghani

    Sir please extra short questions bhi upload karien

  23. Taha

    Very good work

  24. Taha

    You wrk on this too much

  25. AWA

    Asalamu alekum, may i use your material in my notes as well

    1. Author


  26. Khan Seth Jee

    asalam aleykum kia ismy, jo book ka chapters ka andr k long question han woh bhi han?

  27. Wajeeha

    Sir plz numericals explain ker dain plz

  28. Kauro Matsubara

    Awesome! MashaAllah💎

  29. ali

    pleas give answers of self assesment question

  30. Rajput

    Please also answer quick quizzes

  31. Fatima

    Plz physics k quick quiz k answers bhi da dain

  32. Umar Farooq

    Sir plz quick quiz ka bhi answer dain

    1. Ahmad gondal

      Bhai ye konsa question hai

  33. Obaid

    Bro itni der say load ho raha hai pdf
    Aur khul nahi raha

    1. Ayyan

      Check your network connection

  34. Abdullah

    Quick quiz number 1 ka answer’s??

  35. ~SHARAN~

    yar maza agya summer vacation work complete hogya

  36. Ali

    Sir, kia ap tips bhi add kar sakte he??

  37. Minahil Aish

    Sir very thank you for your kind help😘😘

  38. Nobody

    Great 👍 website similar to class notes’ website

  39. Hussnain

    Sir kia online pst test nahi hai

  40. Irum

    How can i dawnload? no any option

  41. Amankhan

    Bhi app sa notes download karna ka system access kar da download nhi ho raha

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