Units and Measu...

Which of the following represent the number 300,000,000 :

Students A,B and C measure the diameter of a copper ball using the same screw gauge. A takes 5 readings, B takes 9 readings and C takes 8 readings. The measured value will be most accurate for

Which of the following is the smallest unit?

Parallax is the apparent displacement of an object because of:

To minimise parallax error, the observer should place the object :

If $$n$$ denotes a positive integer, $$h$$ the Plancks constant, $$q$$ the charge and $$B$$ the magnetic field, then the quantity $$\begin{pmatrix} \dfrac{nh}{2\pi qB}\end{pmatrix}$$ has the dimension of

The effect of parallax is used to measure:

Which of the following statements regarding dimensions is correct?

In which of the following pairs, the two physical quantities have different dimensions?

Parallax method is based on which of the following principle?