In this post, I am sharing FSC **1st Year Physics Chapter 1 Solved Exercise** & Numericals Notes PDF for the students of Intermediate Part 1. This is the 1st chapter from FSC part 1 Physics Book and its name is Measurements. Students can download the **11th class physics chapter 1 Measurements Notes PDF** on their laptops or mobiles. These **Class 11 Physics Notes** are for all the boards working under Punjab Board like Gujranwala Board, Lahore Board, Faisalabad Board, Multan Board, Rawalpindi Board, Sargodha Board, DG Kahn Board, and Sahiwal Board. On ilmihub, I have already posted FSC 1st Year Physics Notes PDF chapter-wise.

**Table of Contents**show

## Chapter 1 Measurements Solved Exercise & Numericals Notes PDF Download

## Solved Exercise

### 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^{8} ms^{-1}).

Solution:

Time = t = 1 year = 365 days

t = 365 x 24 x 60 x 60 sec

t = 31536000 s

Speed of light = c = 3.0 x 10^{8 }ms^{-1}

To find

distance = S =?

Calculation:

we know that S = vt

V = c

S = ct

Putting the value, we get

S = 3 x 10^{8 }x 3156000

**S = 9.5 x 10 ^{15}m**

### a) How many seconds are there in 1 years?

b) How many nanoseconds in 1 year

c) How many Year in one Second?

Solution:

**a) ** We already know that

1 year = 365 days

day = 24 hours

1 hours = 60 minutes

1 minute = 60 seconds

Therefore,

1 year = 365 x 24 x 60 x 60 sec

= 31536000 s

**1 year = 3.1536 x 10 ^{7 }s**

**b) **As we know that

1 year = 3.1536 x 10 ^{7 }s

one second = 10^{9} nanoseconds (1 nanosecond = 10^{-9})

One year = 3.1536 x 10^{7 }x 10^{9 }nanoseconds

**One year = 3.1536 x 10 ^{16 }ns**

**c) **We know that

1 year = 3.1536 x 10^{7 }seconds

= 1/ 3.1536 x 10^{7 }year

**1 second = 3.17 x 10 ^{-8 }years**

### The length and the width of a rectangular plate measured to be 15.3cm and 12.80 cm respectively. Find the area of the plate.

Length of the rectangular plate = l = 15.3 cm

width of the rectangular plate = w = 12.80 cm

area of rectangular plate = A =?

We know that

A = L x W

= 15.3 x 12.80

= 195.84 cm^{2 }**A = 196 cm ^{2 }nearly**

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