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

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Multiple choice 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

If units of mass and length are doubled and that of time remains same, in which quantity numberical value is unchanged?

  1. Force

  2. Energy

  3. Power

  4. Stress
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Stress is defined as force per unit area (Force/Area). If mass and length are doubled, Force (MLT^-2) scales by 2*1*1^-2 = 2, and Area (L^2) scales by 2^2 = 4. Stress scales by 2/4 = 0.5, which changes. However, in many physics contexts, if units are changed proportionally, dimensionless quantities or specific ratios remain unchanged; checking the dimensions, Stress is M L^-1 T^-2. If M -> 2M and L -> 2L, the new value is (2M)(2L)^-1 T^-2 = (2/2) M L^-1 T^-2 = 1. Thus, the numerical value remains unchanged.

Multiple choice 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

When a symbol is used to represent a unit named after a person,  lower-case letters are used.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The given statement is false because upper-case letters are used to represent the symbol of a unit named after a person.
For example : Newton is denoted by  $N$
Multiple choice 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

The correct way to represent an unit amount of force is :

  1. 1 newton

  2. 1 Newton

  3. 1 NEWTON

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The full name of the unit, irrespective of the fact whether it is named after a scientist or not, is always written with the lower initial letter. Hence 1 newton is correct way to write.

Multiple choice 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

The symbol for a unit which is not named in the honour of some scientist is written in

  1. Lower initial letter

  2. Initial capital letter

  3. Lower letter

  4. All
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The symbol for a unit which is not named in the honor of some scientist is written in lower letter.ex:- the symbol for metre is 'm',for kilo gram is 'kg' and for second is 's'.

Multiple choice 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

Full name of the unit named in the honour of a scientist is written with

  1. Lower initial letter

  2. Initial capital letter

  3. Lower letter

  4. All
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Full name of the unit named in the honour of a scientist is written with lower initial letter. For example, the full form for unit of force is newton and not Newton.

Multiple choice 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

The ratio of SI unit to CGS unit of $g$ is :

  1. $10^2$

  2. $10$

  3. $10^{-1}$

  4. $10^{-2}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

SI unit of $g$ is   $m/s^2$
CGS unit of $g$ is  $cm/s^2$
We know that  $1 \ m = 100 cm$
Thus ratio of SI unit to CGS unit  $\dfrac{m/s^2}{cm/s^2} = \dfrac{100 \ cm/s^2}{cm/s^2} = 10^2$