Advertisements
Advertisements
Question
While measuring the length of an object using a ruler, the position of your eye should be
Options
left side of the point.
vertically above the point where the measurement is to be taken.
right side of the point.
any where according to one’s convenience.
Advertisements
Solution
vertically above the point where the measurement is to be taken.
APPEARS IN
RELATED QUESTIONS
Write true or false.
Every measurement involves two things – a number and a unit.
Ten millimetre makes one centimetre.
Can you find the diameter of a thin wire of length 2 m using the ruler from your instrument box?
Now guess the length and width of many other things. Measure and find the difference between your measure and your guess.
| Size of | Your guess in cm | Your measure in cm | ||
| Length | Width | Length | Width | |
| 100 Rupee note | ||||
| 10 Rupee note | ||||
| 20 Rupee note | ||||
| 5 Rupee note | ||||
| Post card | ||||
| Math-Magic book | ||||
Can you think of how to cut a postcard so that you can pass through it?
Length is a fundamental quantity.
Length is ______.
- The earth-moon distance is about 60 earth radius. What will be the diameter of the earth (approximately in degrees) as seen from the moon?
- Moon is seen to be of (½)°diameter from the earth. What must be the relative size compared to the earth?
- From parallax measurement, the sun is found to be at a distance of about 400 times the earth-moon distance. Estimate the ratio of sun-earth diameters.
Why is Earth's orbit used instead of its diameter to measure distances to stars using the parallax method?
If a planet subtends an angle α at distance D, what formula is used to find the planet's diameter?
