Question 13: Differentiate between the following: (a) Light Year (b) Year Answer
Question 11: Density of air is 1.2 kg/m3. Change it to g/cm3. Solution Ginven density of air, Now we know that, 1 kg = 1000…
Question 12: An old saying is that “a chain is as strong as its weakest link”. What analogue statement can you make regarding measurement? Answer…
Question 10: What does the word “micro” signifies in the word “microwave oven”? Answer Microwaves fall in the category of radio waves. Radio waves have…
Question 1: Define the number π and show that 2π radians = 3600. Answer The circumference of a circle is directly proportional to the diameter…
Question 2: Define the terms error, uncertainty, precision and accuracy in measurement. Answer Error Error is the difference between the true value of the quantity…
Question 3: Explain several phenomena occurring naturally which could serve reasonable time standard. Answer Many repetitive phenomena occurring in nature can be reasonable time standards.…
Question 4: Why is it more useful to have two units for amount of substance, kilogram and mole? Answer Kilogram measures, in fact, how heavy…
Question 5: Show that the famous Einstein’s equation E = mc2 is dimensionally consistent. Answer Dimensional consistency means the dimensions on both sides of the…
Question 6: Deduce the dimensions of gravitational constant. Answer Newton’s law of Universal Gravitation is Here G is the gravitational constant. We have to find…