Units and measurments

What is the analogy that you will use in order to solve questions that are related like if units s present what about dimensions etc

Also how would you assign the analogy??

You would use the song Neeche phuloon ki dukan uppar gori ka makkan ; Unit → phuloon ki dukaan, dimension → Gori ka makaan

What are the dimensionless functions and also state any exceptions if any

1. Trigonometric functions

2. Exponents

3. Numerical values (Usually, unless the numerical value helps a variable become a dimension)

4. things like pi

5. The ‘d‘ when doing differentiation, ex, dy/dx, when taken, the dimensions are y/x

6. The design when doing calculus

When can you use the dimensional trick to solve NEET questions

Only if there are no numerical values given in the question and the answer

What are the rules for significant figures

1. All the zeros that don’t have a number >=1 aren’t significant numbers

2. When rounding off after a decimal point, 2 cases arise:-
   1) Even numbers present before 5 => You leave it
   2)Odd numbers present before 5 => You add 1 to it

What is accuracy

It is the closeness of a value to the true value

What is precision

How precise a given value is

What are the error rules when calculating with errors?

What does and m show when calculating errors

∆m → error in mass ; m → Total mass

What is the value of the scale on which Vernier callipers are measured? Why is that unit used?

10 mm = 1 cm; The re measured in mm for precision

What is the value of 1 VSD reading

9 mm

What is the value of 1 MSD reading

1 mm

What is the Least count of an instrument

It is the minimum reading that can be taken by an instrument

How would you find out the L.C for an instrument

1 main scale division - 1 vernier caliper division

How would you find out the reading of an instrument?

Main scale reading