**HOME WORK - 31/10/2019 - PHYSICS - NIOS - 312 - UNITS, DIMENSIONS AND VECTORS - 1
Senior Secondary Course**

**Module I UNITS, DIMENSIONS AND VECTORS - HW-01-01**

**Chapter Name - UNITS, DIMENSIONS AND VECTORS - 1
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**#. Answer the following Topics in 6 lines only or 6 points :**

T1. PHYSICAL WORLD AND MEASUREMENTS

1. Physics: Scope and Excitement

2. Nature of Physical Laws

3. Physics, Technology and Society

4. Need of Measurement

T2. UNIT OF MEASUREMENT

1. Measurements in Indian Traditions

2. The SI Units

3. Standards of Mass, Length and Time

4. Significant Figures

5. Importance of significant figures in measurement

6. Importance of significant figures in expressing the result of calculations

7. Significant figures in addition, subtraction, multiplication and division

8. Derived Units

9. Nomenclature and Symbols

T3. DIMENSIONS OF PHYSICAL QUANTITIES

1. Applications of Dimensions (or dimensional equations)

T4. VECTORS AND SCALARS

1. Scalar and Vector Quantities

2. Representation of Vectors

3. Addition of Vectors

4. Parallelogram Law of Vector Addition

T5. MULTIPLICATION OF VECTORS

1. Multiplication of a Vector by a Scalar

2. Scalar Product of Vectors

3. Vector Product of Vectors

T6. RESOLUTION OF VECTORS

T7. UNIT VECTOR

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**Important Questions for NIOS - ODE & PE**

Q1. Discuss the nature of laws of physics.

Q2. How has the application of the laws of physics led to better quality of life?

Q3. What is meant by significant figures in measurement?

Q4. Find the number of significant figures in the following quantity, quoting the relevant laws:

(i) 426.69 (ii) 4200304.002 (iii) 0.3040 (iv) 4050 m (v) 5000

Q5. The length of an object is 3.486 m, if it is expressed in centimetre (i.e. 348.6cm) will there be any change in number of significant figures in the two cases.

Q6. What are the four applications of the principles of dimensions? On whatprinciple are the above based?

Q7. The mass of the sun is 2 × 1030 kg. The mass of a proton is 2 × 10–27 kg. If thesun was made only of protons, calculate the number of protons in the sun?

Q8. Earlier the wavelength of light was expressed in angstroms. One angstrom equals 10–8 cm. Now the wavelength is expressed in nanometers. How many angstroms make one nanometre?

Q9. A radio station operates at a frequency of 1370 kHz. Express this frequency in GHz.

Q10. How many decimetres are there in a decametre? How many MW are there in one GW?

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