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
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. Example length, time, mass | All the quantities, which can be described in terms of base quantities, are known as derived quantities. Example 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.
Sir Assalam o alaikum
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Sr urdu medium m send kr dy please
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Answers lagy huay hain.. un ka text bold(dark) hai.. mcqs k options mai hi answers hain..
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Please write short questions of every chapter other than exercise questions especially physics
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Exercise main jo MCQS diey hoy hain un ko kaise solved karen
Sir kindly can you let us download these notes it’s quit hard please allow to download
Last ma dekha Sara answers diye hua hain
there are no quic quiz
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This help in when i am sick and did not attended any class
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sir plz uplod urdu
there is a mistake in Problem 1.5 part b answer one zero is missing
why there are no short questions available ??????
Prepare Long Q, and Exercise Q.. No need to prepare other short questions.
Sir but we need short questions of physics all chapter ,,, it is compulsory
actually sir we need model paper and lectures
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 🙏
Unhi Extra MCQ’s k end py Answers bhi hain. Check.
No quick quiz, mini exercises solutions given……… If there will be then these are the best ever notes…..
Assalamualaikum! Sir physics Kay additional short question bi ap upload kar day please please sir
mini exercise or box questions ka answers nhi han please add them
Thank u so much your notes are very helpful
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Special Thanks to the person who has made all the notes.
Sir please extra short questions bhi upload karien
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You wrk on this too much
Asalamu alekum, may i use your material in my notes as well
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asalam aleykum kia ismy, jo book ka chapters ka andr k long question han woh bhi han?
Sir plz numericals explain ker dain plz
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pleas give answers of self assesment question
Please also answer quick quizzes
Plz physics k quick quiz k answers bhi da dain
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Bhai ye konsa question hai
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Quick quiz number 1 ka answer’s??
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Sir, kia ap tips bhi add kar sakte he??
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Sir kia online pst test nahi hai
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Bhi app sa notes download karna ka system access kar da download nhi ho raha