Which of the following has the highest energy value?

Express the following in scientific notation:
$(i)$ $0.0048$
$(ii)$ $234,000$
$(iii)$ $8008$
$(iv)$ $500.0$
$(v)$ $6.0012$

The number of significant figures in $60.0001$ is

Which is the heaviest among the following?

Which of the following have the same number of significant figures?
$(A)$ $0.00253$
$(B)$ $1.0003$
$(C)$ $15.0$
$(D)$ $163$
Choose the correct answer from the options given below:

The number of significant figures in $50000.020 \times 10^{-3}$ is ..... .