NIOS Class 10 Science and Technology Chapter 1 Measurement in Science and Technology Solutions to each chapter is provided in the list so that you can easily browse through different chapters NIOS Class 10 Science and Technology Chapter 1 Measurement in Science and Technology and select need one. NIOS Class 10 Science and Technology Chapter 1 Measurement in Science and Technology Question Answers Download PDF. NIOS Study Material of Class 10 Science and Technology Notes Paper 212.
NIOS Class 10 Science and Technology Chapter 1 Measurement in Science and Technology
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Measurement in Science and Technology
Chapter: 1
INTEXT QUESTIONS 1.1
1. Define the term measurement by giving two examples.
Ans: Measurement may be defined as a kind of counting. It refers to counting the number of times a chosen scale is used to make the measurement.
For example: An inch tape to measure length, or a graded cylinder to measure volume.
2. What is a unit?
Ans: A unit is a measure, device or a scale in terms of which we make physical measurements.
3. List the essential characteristics of a unit.
Ans: A standard unit must have the following characteristics to be useful:
(i) Relevant.
(ii) Convenient.
(iii) Well defined.
INTEXT QUESTIONS 1.2
1. Name the smallest unit of length during the Chandragupta Maurya period.
Ans: Parmanu.
2. List the parts of the human body which can be used for measurements.
Ans: The parts of the human body which can be used for measurements are mentioned below:
(i) Arm.
(ii) Angul.
(iii) Cubit etc.
3. Why cannot the parts of the human body be used for accurate measurement?
Ans: Because the parts of the human body may vary from person to person and we cannot trust our senses to measure exactly and accurately.
4. In which period was ‘gaz’ introduced as a unit to measure length?
Ans: During the period of Mughal emperor Akbar.
INTEXT QUESTIONS 1.3
1. Differentiate between base units and derived units.
Ans: The different between base and divided unites are mentioned below:
(a) Fundamental units are only seven in number whereas derived units are very large in number.
(b) Fundamental units are independent of each other but derived units are obtained from fundamental units.
2. What is the difference between mass and amount of a substance?
Ans: Mass of a body is the amount of matter contained in a body while the amount of the substance is equal to its molecular mass.
3. Derive the unit of Pressure. (Pressure = Force/Area).
Ans: Unit of pressure = Unit of force/Unit of area = kg ms-2 / m2 = kg m-1s-2.
4. Which term of measurement is commonly used by the announcer of your favourite radio programme?
Ans: Hz.
5. Observe a bulb/tube light at your home for the unit measurement written on it. From Table 1.3 find out the physical quantity it measures?
Ans: Watt.
6. Veena, Mohindar and Alarm went to market. Veena brought milk with a litre measure, Mohindar brought ribbon by a measuring and Alam brought vegetables using stones. Which of them did not use the appropriate measurement while purchasing goods? Explain while given the names of right measurements.
Ans: For the measurements of ribbon we must use the metre scale so Mohindar brought this without properly measuring it. Alam also brought the vegetable without the counting of proper units of this so the vegetables must be counted by the kilograms or grams properly.
INTEXT QUESTIONS 1.4
1. Rewrite the following measurements of length using suitable SI prefixes.
(i) Effective radius of a proton; 1.2 × 10–15m __________.
Ans: 1.2 fm.
(ii) Radius of human red blood cell; 3.7 × 10–6m ________.
Ans: (ii) 3.7 mm.
(iii) Radius of our galaxy; 6 × 1019m ________ You must follow the following rules while using SI prefixes.
Ans: 60 E m.
| TERMINAL EXERCISE |
1. Which of the following is not an SI unit?
(a) Metre.
(b) Pound.
(c) Kilogram.
(d) second.
Ans: (b) Pound.
2. If the mass of a solution in 10 μg it is the same as.
(a) 10–6 g.
(d) 10–12 g.
(c) 10–9 g.
(d) 10–3 g.
Ans: (a) 10–6 g.
3. Indicate whether the following statements are True or False. Write T for true and F for false.
(i) SI units are arbitrary.
Ans: False.
(ii) 1 mm2 = 10–3 m2.
Ans: True.
(iii) 10–15 g = 1 mpg.
Ans: False.
(iv) SI unit for pressure is Pascal.
Ans: True.
4. Represent the following measurements by using suitable SI prefixes.
(i) 2 × 10–8 s.
Ans: 2 x10-s = 20 x 10-s 20ns .
(ii) 1.54 × 10–10m.
Ans:1.54 x 10-10m = 154 x 10-12 m = 154 picometer.
(iii) 1.98 × 10–6 mol.
Ans: 1.98 x 10-6 mol = 1.98 pmol.
(iv) 200 000 kg.
Ans: 2000 00 2 x 105 kg = 0.2 megna kg.
5. Give the SI units used while buying:
(a) Silk ribbon.
Ans: Metre.
(b) Milk.
Ans: Litre.
(c) Potatoes.
Ans: kg.
6. Give the common unit to measure our body temperature and write its SI unit .
Ans: The common unit to measure our body temperature and its SI unit are measuring body temperature is degree Celsius. It is written as 0C. SI unit of temperature is Kelvin (K).
7. What are the advantages of SI units?
Ans: The advantages of SI units are mentioned below:
(i) Simplicity and Ease of Use: SI units are based on simple and coherent principles, making them easier to understand, remember, and apply in practical situations. This simplification reduces the likelihood of errors in measurement and calculations.
(ii) Scalability: SI units are designed to be scalable across different orders of magnitude, which means they can be easily applied to measurements spanning from the atomic scale to astronomical distances.
