NIOS Class 10 Science (212) Worksheet 1 Solutions

In this worksheet you will find answers of questions of worksheet 1 NIOS class 10 science Chapter 1 Measurement in Science and Technology.

Measurement in Science and Technology Worksheet -1

This post provides you a complete solution for worksheet 1 of NIOS class 10 science. The solutions have been prepared by experienced teachers.

 

Q1. Measurement is an essential activity in our daily life. Observe your surroundings and ask yourself why this is important. Justify your answer with reasons.

Answer

Yes, measurement is a very important part of our daily life. Because measurement brings efficiency, precision and safety in work.

We can do our work properly and in well managed way without any confusion.

Without measurement, we would not know how much, how long, how far or how heavy something is.

We would make mistakes and our work is guessing work without measurement. So, measurement plays an important role in our daily life.

We can understand the importance of measurement with simple reasons

   1.  Cooking – When we cook food, we measure ingredients like a cup of rice or 2 spoon of sugar. Without appropriate measurement our recipe would be tasteless.

   2. Time management – We check distance and time when we travel and want to arrive our destination. Our work at school, office runs according to time table. So we have to measure time to fulfill deadlines.

   3. Money and budgeting – We use measurement to keep our expenditures and savings and manage our finance.

   4. Shopping – We buy something in market, we measure quantity like 1 kg, 1 litre.

   5. Science and technology – We need accurate measurement in science experiments, inventions, observations. We measure time, temperature and quantity.

So, these are some reasons that show measurement is necessary in all parts of life.

Q2. Measurement is a fundamental skill which is an essential part of our daily life activities without which we cannot do anything. Choose any five objects from your surroundings with different materials and different dimensions. Make a table using the above units.

Answer

Measurement is a fundamental skill which is essential part of our daily life activities.

Following are the five object that we use daily

Name of object	Length/breadth/height	Weight	Area/volume
Medicine box	15cm/5cm/4cm	50g	-/3000cm3
Steel water bottle	H- 25cm , Dia- 7 cm	500g	-/9600 cm3
Plastic lunch box	18cm/12cm/6cm	300g	-/12960 cm3
Wooden study table	100cm/60cm/2cm	250g	-/6000 cm3
Notebook	21cm/15cm/2cm		-/315 cm3

 

Q3. Make any two questions for the following passage

We express the result of measurement of a physical quantity by its value. The number of times the value of a quantity is used for measurement, it is equal to the product of number and the quantity defined for measurement. The value of a physical quantity is made up of two parts, the numerical quantity and the unit, and it is equal to the product of both.

Value of physical quantity = numerical value ×unit

Answer

Following are the two questions from the above passage and their answers

(i)   What are the two parts that make up the value of a physical quantity?

Ans – (i) Numerical value (ii) unit

(ii)    Write the formula to express the value of a physical quantity.

Ans - Value of physical quantity = numerical value ×unit

Q4. A unit is a measurement device, scale with the help of which we measure a physical quantity. As stated in question 3, the value of a physical quantity consists of two parts, the numerical value and the unit, and it is equal to the product of both. Imagine that any unit can be used for any dimension? For example, can we measure distance in kilograms?

i.    If yes, then justify the answer with reasons.

ii.  If not, then justify the answer with reasons.

iii. Write the characteristic of the unit.

Answer

No, we cannot measure distance in kilograms because we cannot any unit for any physical quantity. Each physical quantity has a specific ‘unit’

Distance is related to length and it is measured in meters, centimeters and kilometers.

 Kilogram is a unit of mass.

Characteristics of Unit

    1. It should be well defined.

    2. It should be universally accepted.

    3. It should not change with time or place.

Q5. The system of measuring and measuring devices has been there since ancient times. Various methods of measurement were adopted. Write the different methods of measurement used by our ancestors and explain how you found the above methods of measurement useful.

Answer

 In ancient times, people used body parts as units of measurement.

Different Methods of Measurement Used by Our Ancestors

   1. Hand span – The distance between the tip of thumb and the tip of the little finger when the hand is fully stretched. This is used to measure length of clothes or objects.

   2. Cubit – The length from the elbow to the tip of the middle finger. It is used to measure walls or wood.

   3. Footstep – Distance covered in one step of a person. It is used measure land.

   4. Finger width(angul) -Width of a finger used to small objects

These methods are helpful, easy and quick and anyone could measure with their body parts. These are not accurate but they helped people in basic measurements.

Q6. In the course of development of the units,many methods were adopted. The exercise to redefine the system of units led to the birth of the current system, the SI system. Comment on why the need was felt to redefine different systems of units defined and used by different countries.

Answer

Different countries and regions used different systems of units for measuring physical quantities like – CGS, FPS, MKS etc. But this caused confusion and errors in trades, science and other daily life work between counties.

Reasons for Redefine Unit System

   1.  Different units were used for the same quantity so it was difficult in comparing values.

   2. Buyers and sellers from different countries used different units, this created disputes.

   3. Universally accepted standard units are essential in scientific research and data sharing.

   

   So, In 1960 International systems of units (SI) were introduced to solve these problems. This system is globally accepted based on seven basic units.

Q7. For measurement, each physical quantity has an SI unit assigned to it, for examples “meter for distance”, units smaller and larger than the basic SI units can be converted and 10³m=1 kilometer, etc. Explain why do we need different units for the same physical quantity?

Answer

We need different units for the same physical quantity to make the measurement easy, practical and more accurate.

Reason -  If we use only one unit like meter for all measurement, it will be difficult. For example – Distance between two cities 150,000 m but it is easy to say 150km.

So different units for the same physical quantity allow us to measure a wide range with more effectiveness and accuracy.

Q8. Take any book form your bag and measure its dimensions with a suitable scale and calculate the volume of the book. After measuring, convert the units and its volume into three different units to be used to measure that quantity.

Answer

I took my science book and measured its dimensions using a scale.

Length = 25 cm

Breadth  = 18 cm

Height = 3 cm

Calculate the volume

 

Now we convert volume into different units

    1.  In cubic meters(m³)

    1cm³ = 1 ×10^-6 m³

  1350cm³ = 1350 ×10^-6

   = 0.00135 m³

    2. In Litres (L)

        1cm³ = 1mL

         1350cm³ = 1350mL

         1000mL = 1L

So 1350mL  = 1.35 L

 

    3. In cubic decimeters(dm³)

     1dm³  = 1000cm³

     1350 /1000= 1.35dm³

Q9.Presently we follow interstitial method which is called as SI unit. The symbols of the units obtained from the names of the units are indicated by a special letter. Explain whether it is correct to write the units in the plural or to change the letter. For example, a unit of mass if gram which is denoted by “g” , can we write it as “gm” or in plural case it can be written as “gs” or “gms”.

i.     If yes, then justify the answer with reasons.

ii.  If not, then justify the answer with reasons.

iii. Explain how you have to follow the grammar of SI units when writing units.

Answer

No , we should not write units  in plural form or change their symbols because SI units are standard and universal.

Each unit has a unique symbol such as “g”  for gram, “m”for metre .

We must write 100 g not 100 gms.

We must follow  these rules to follow  the grammar of SI unis

    1. Always use standard symbols. Example – “g” for gram.

   2. Do not use plural forms of symbols. We should not add “s” to the symbol to make it plural.

   3. Use lowercase and uppercase. Some symbols are in lowercase and some in uppercase.

 

These are the answers of questions given in worksheet. You can visit official site for worksheet-1 for science class 10.