Tag: rules to write name and symbol for units of s.i. system

Questions Related to rules to write name and symbol for units of s.i. system

The characteristic of a good unit is ..

physics motion and measurement guidelines for writing the units conventions for the use of si units rules to write name and symbol for units of s.i. system

  1. It should be universally accepted

  2. It should be invariable and not perishable

  3. It should be easily available & easy to reproduce

  4. All of these

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Correct Option: D
Explanation:

A good unit should contain all of the properties. 

Ans: All of these

The prefixes $nano (n), micro (\mu)$ and $pico (p)$ are often used with units.
Which row shows their correct values?

physics motion and measurement guidelines for writing the units conventions for the use of si units rules to write name and symbol for units of s.i. system

  1. $n = 10^{-6}, \mu = 10^{-9}, p = 10^{-12}$

  2. $n = 10^{-6}, \mu = 10^{-12}, p = 10^{-9}$

  3. $n = 10^{-9}, \mu = 10^{-6}, p = 10^{-12}$

  4. $n = 10^{-12}, \mu = 10^{-9}, p = 10^{-6}$

Show answer
Correct Option: C
Explanation:

1 nano unit = $10^{-9}$ unit

1 $\mu$  unit= $10^{-6}$  unit
1 $p$ unit = $10^{-12}$  unit
So, option C is correct 

Which definition is correct and uses only quantities rather than units?
physics motion and measurement guidelines for writing the units conventions for the use of si units rules to write name and symbol for units of s.i. system

  1. Density is mass per cubic metre

  2. Potential difference is energy per unit current

  3. Pressure is force per unit area

  4. Speed is distance traveled per second

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Correct Option: C
Explanation:

We know that 

Pressure $P= \dfrac{Force }{Area}$
So, option C is correct.

Which of the statements are false?

physics motion and measurement guidelines for writing the units conventions for the use of si units rules to write name and symbol for units of s.i. system

  1. The units of physical quantity represented by volume is $cm^3$

  2. The unit of physical quantity represented by mass is $ton$

  3. The work done is represented by $\dfrac{kg}{m}$

  4. The unit of physical quantity represented by weight is $Newton$

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Correct Option: C
Explanation:

Work done is given by   $W = FS $
Thus work has the units of  $kg .m s^{-2}.m$
Thus statement given in option C is incorrect.

Which of the following statements below should be followed while using the symbol for a unit of a physical quantity?

physics motion and measurement guidelines for writing the units conventions for the use of si units rules to write name and symbol for units of s.i. system

  1. The symbol named after a scientist should begin with a capital letter.

  2. They can take plural forms.

  3. They can be written in full.

  4. They should be written only in the agreed symbols while using symbols.

Show answer
Correct Option: A,C,D
Explanation:
Basic rules for the use and writing for a  unit of a physical quantity are;
1. They symbol named after scientist should have the capital letter, 
2. They can be written in full 
3. They should be written only in the agreed symbols be used while using the symbol for a unit of a physical quantity. 
4. They cannot take plural forms.