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Physics
Class XI ISC
| Question | Answer |
|---|---|
| Physical Quantities | A quantity linked with a physical phenomenon and which is subjected to measurement can be treated as a physical quantity. |
| Units of Measurement | In order to measure a given physical quantity, we assume that a magnitude of that quantity as a standard and call it unit of that quantity. The measurement of a given physical quantity is the comparison of that quantity with its unit. |
| To express a measurement, 2 things must be mentioned - ________& ______________ | Numerical value unit |
| Smaller the unit of the physical quantity, ______ is its numerical value. | Larger |
| Name the 7 fundamental quantities | Length Mass Time Temperature Electric Current Amount of Substance Luminous Intensity |
| Name the 2 supplementary fundamental quantities and their units | Plane angle radian rd Solid angle Ste-radian sr |
| Fundamental Units | Units that are independant of each other |
| Derived Units | Units that can be derived from other fundamental units or derived units |
| Name and expand the 3 systems of units | CGS: cm, g, s MKS: m, kg, s FPS: foot, pound, s |
| 2 other names for CGS system | Gaussian system Metric system |
| FPS system is also known as ________ | Non metric system |
| Why is CGS system also known as metric system? | Because multiples and submultiples of fundamental units are obtained in powers of 10. |
| SI System | Internationally accepted system based on 7 basic units and 2 supplementary units |
| 1 m = ______angstrom | 10^10 |
| 1m = ______ fermi | 10^15 |
| Astronomical Unit | Average distance between the earth and sun. It is the orbital radius of the earth. 1 AU = 1.5 x 10^11 m |
| Light Year | Average distance travelled by light in vacuum in one year. 1 ly = 9.46 x 10^15 |
| Paralactic Second (Parsec) | 1 parsec is the distance at which the average radius of the earths orbit would subtend an angle of 1second 1 parsec = 1 AU / 1" |
| Significant figures | In the measurement of a quantity, the digits measured accurately and the first doubtful digits together are known as significant figures. |
| Rules for S.F | 1. non-zero = S 2. 0s bw non-zero digits = S 3. 0s to right of non zeroes wothout decimal = NS unless it is a measuremnt 4. 0s to the right of non zero digit but left of decimal point=S 5.l 0s to right of decimal point = S 6. initial 0s = NS |
| Rules for rounding off | 1.digit to be dropped <5, remains unchanged 2.didgit to be dropped >=, add 1 3. if digit to be dropped is 5/500..., even=unchanged, odd=+1 4.if digits to be dropped is 5 followed by nonzero at any place, +1 if even/odd |
| Order of Magnitude | If we write the magnitude of a quantity in the nearest power of 10, then the nearest value obtained in the powers of 10 is called order of magnitude. |
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