Order of Magnitude

Q. What is the order of magnitude

Q. a physical quantity is measured and its value is found to be nu where n=numerical value, u=unit. prove that n is inversely proportional to u.

Q. Using the concept of significant figures, match Column I with the correct number of significant figures in Column II.
$\begin{array}{cccc}& \text{Column I}& & \text{Column II}\\ i& 0.1234& \text{a.}& 5\\ ii& 1.2100\text{cm}& \text{b.}& 4\\ iii& 47.23÷2.3& \text{c.}& 1\\ iv& 3\times {10}^8& \text{d.}& 2\end{array}$

1. $i–b;ii–a;iii–d;iv–c$
2. $i–b;ii–a;iii–c;iv–d$
3. $i–b;ii–d;iii–a;iv–c$
4. $i–c;ii–a;iii–d;iv–b$

Q. State the number of significant figures in the following
a. $0.006{\text{m}}^2$
b. $2.65\times {10}^3\text{kg}$
c. $0.2309{\text{m}}^{-3}$
d. $6.320\text{J}$
e. $0.006032{\text{m}}^2$

1. (a) - 1 ; (b) - 3 ; (c) - 4 ; (d) - 4 ; (e) - 6
2. (a) - 1 ; (b) - 3 ; (c) - 4 ; (d) - 3 ; (e) - 4
3. (a) - 1 ; (b) - 3 ; (c) - 4 ; (d) - 4 ; (e) - 4
4. (a) - 1 ; (b) - 3 ; (c) - 4 ; (d) - 3 ; (e) - 6

Q.

How many grains of rice should the king give to satisfy the champion ?

1. 100000

2. 1 million

3. 1 billion

4. none of these

Q. Q 9/90 Choose the correct statement amongfollowing. aIt is necessary that a more precisevalue is also more accurate. b It is not necessary that a moreprecise value is more accurate too. c Accuracy tells us to what resolutionor limit, the quantity is measured. d Both (2) & (3)

Q.

Match the order of magnitude of observations in p and q with their correct values in x and y.

(p)$3\times {10}^8$ (x) 8

(q)$7\times {10}^8$ (y) 9

1. P - x, q - x

2. p - x, q - y

3. p - y, q - y

4. p - y, q - x

Q. Using the concept of significant figures, match Column I with the correct number of significant figures in Column II.
$\begin{array}{cccc}& \text{Column I}& & \text{Column II}\\ i& 0.1234& \text{a.}& 5\\ ii& 1.2100\text{cm}& \text{b.}& 4\\ iii& 47.23÷2.3& \text{c.}& 1\\ iv& 3\times {10}^8& \text{d.}& 2\end{array}$

1. $i–b;ii–a;iii–d;iv–c$
2. $i–b;ii–a;iii–c;iv–d$
3. $i–b;ii–d;iii–a;iv–c$
4. $i–c;ii–a;iii–d;iv–b$

Q. do significant figures change if we measure a physical quantity inndifferent system of units expain with example

Q. Which of the following length measurement is most accurate and why?
a) 2.0
b) 2.00
c) 2.000

Q. Order of magnitude of 3000000 is

1. 6
2. 7
3. 5
4. 8

Q. Order of magnitude of 50000000 is

1. 6
2. 7
3. 5
4. 8

Q. Using the concept of significant figures, match Column I with the correct number of significant figures in Column II.
$\begin{array}{cccc}& \text{Column I}& & \text{Column II}\\ i& 0.1234& \text{a.}& 5\\ ii& 1.2100\text{cm}& \text{b.}& 4\\ iii& 47.23÷2.3& \text{c.}& 1\\ iv& 3\times {10}^8& \text{d.}& 2\end{array}$

1. $i–b;ii–a;iii–d;iv–c$
2. $i–b;ii–a;iii–c;iv–d$
3. $i–b;ii–d;iii–a;iv–c$
4. $i–c;ii–a;iii–d;iv–b$