# SI Units for Plane Angle and Solid Angle

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## 29 Questions

### What is a unit in the context of measuring physical quantities?

A standard to compare with

### Why do we need only a limited number of units to express all physical quantities?

Because units are derived from base units

### What are the units for fundamental or base quantities called?

Fundamental units

Derived units

System of units

### Why did scientists from different countries use different systems of units in the past?

Lack of a universally accepted system

Kilogram

### How is the second defined in the SI system?

In terms of the caesium frequency

A

Plane angle

### What represents the SI unit of length?

$m$

4

### What is the best way to remove ambiguities in determining the number of significant figures?

Reporting every measurement in scientific notation

### In scientific notation, how is a number typically expressed?

a × 10^b (where a is between 1 and 10, and b is any positive or negative exponent of 10)

### What happens to the number of significant figures when changing units in a measurement?

The significant figures remain the same

### When rounding off a number in scientific notation, what value should 'a' be rounded to if 'a' is less than or equal to 5?

'a' should be rounded to 5

### What are the base units for length, mass, and time in the MKS system?

Metre, kilogram, second

### Which organization developed the standard scheme of symbols, units, and abbreviations for the SI system in 1971?

Bureau International des Poids et Measures

### Why are conversions within the SI system considered simple and convenient?

Due to the use of the decimal system in SI units

Seven

### How is solid angle dΩ defined in SI?

Ratio of intercepted area to square of radius

### What is the rule provided for determining the significant figures when all zeros are between two non-zero digits?

All zeros are significant, regardless of the location of the decimal point.

### If a number is less than 1, which zeros are not considered significant?

Zeros on the left of the first non-zero digit

Four

### What is the significance of the trailing zeros in a number with a decimal point?

They are always considered significant.

### Why are the zeros in 4.700 m considered significant?

To indicate precision of measurement

### How many significant figures does 123000 mm have?

Four

Learn about the SI units for plane angle (radian) and solid angle (steradian) which are both dimensionless quantities. Explore the definitions and symbols of radian (rad) and steradian (sr), along with other SI base quantities and units.

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