 Hello friends, I hope you all are doing great. In today’s tutorial, we will have a look at Ist Year Physics Chapter 01 Exercise Solved Questions. Friends i am going to start a new tutorial series in which I will discuss all questions given in the exercise of first-year fsc physics with the detailed.

In this first post of this series, we will discuss the first chapter questions and their answer with the detail. I hope this tutorial will be very useful to you and will get solution comprehensive way. So let’s get started with Ist Year Physics Chapter 01 Exercise Solved Questions.

#### Ist Year Physics Chapter 01 Exercise Solved Questions

• Let’s discuss all the questions one by one with the detailed.

#### Question 1.1

• The phenomena which repeat after a certain time interval be used for measuring of time are given here.
• Rotation of different planets about the sun.
• Rising of sun and moon.
• The setting of the moon and sun.
• Earth rotation around its own axis. #### Question 1.2

• The equation of the time period of a pendulum is given here.

T=2Π√(l/g)

• The disadvantage or drawbacks occurring due to the use of a pendulum as a time standard are given here.
• As the value of g is not constant at different positions. so if the length of a pendulum is the same there will be variation in time period due to g.
• The resistance offered by the air also disturbs the value of the time period.
• Weather also effect time period in summer length of the pendulum increases which also increases time period. #### Question 1.3

Kilogram:

• It is beneficial to use the Kg unit for such a state when we needed a certain amount of mass without taking into consideration atoms and molecules existing in the substance.

Mole:

• This unit is used for atom and molecules existing in the substance.
• For a mole of gases define fix number of atoms or molecules. That are 6.023×1023 atoms or molecules in a mole. #### Question 1.4

• The least count of scale is one millimeter or 0.001 meters.
• So 0.214 meter is the correct answer because scale measures up to 3 decimals accurately. #### Question 1.5

• Its analogous is that experimental results are accurate if it has a large number of errors. #### Question 1.6

• There are 2 main errors are possible which are mentioned here with the detailed. Systematic Error

• This error occurs due to the measuring device that is a stopwatch. it will be due to zero error of stopwatch or incorrect measurements of a stopwatch.

Personal Error

• This error due to inexperienced observers or observers. Error in time of stopwatch exits during on and off it.

#### Question 1.7

• There is no information is given about the dimensionless quantity through the dimensional analysis.
• By experiment or theoretically, the value of the constant of proportionality can be measured.
•  For instance, the time period equation is T=2Π√(l/g) the numerical value of this constant can not be found by the dimension analysis. It can be found by the experiments. #### Question 1.8 Pressure Dimensions:

Pressure= Force/Area

P=F/A= ma/A

[P]=[m][a]/[A]

=[M][LT-2]/L2

P=[ML-1T-2]

Density Dimensions:

ρ=m/V

[ρ]=[m]/[V]

=[M]/[L3]

=[ML-3]

#### Question 1.9 f=vλ

[T-1]=[LT-1][L]

=[L2T-1] it is false

f=v/λ

[T-1]=[LT-1]/[L]

[T-1]=[T-1] it is correct

So friends it the detailed post about the Ist Year Physics Chapter 01 Exercise Solved Questions. In next tutorial i will upload the solution of 2nd chapter. Till than take care. Thanks for reading.

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