List of top Chemistry Questions on Uncertainty in Measurement

The relation between uncertainty in position and momentum is given by of a particle simultaneously decided
The number of \( \text{Cl}^- \) ions in \(100 \, \text{mL}\) of \(0.001 \, \text{M}\) NaCl solution is:

If the uncertainty in velocity and position of a minute particle in space are, \(2.4 × 10^{–26}\) \((m s^{–1)}\) and \(10^{–7} (m)\), respectively. The mass of the particle in g is _____ . (Nearest integer)
(Given : \(h = 6.626 × 10^{–34} Js\))

The current voltage relation of diode is given by $I=\left(e^{1000 V / T}-1\right) mA$, where the applied voltage $V$ is in volt and the temperature $T$ is in kelvin. If a student makes an error measuring $\pm 0.01\, V$ while measuring the current of
What do you mean by significant figures?
Express the following in the scientific notation: 
(i) 0.0048 
(ii) 234,000 
(iii) 8008 
(iv) 500.0 
(v) 6.0012
How many significant figures are present in the following? 
(i) 0.0025 
(ii) 208 
(iii) 5005 
(iv) 126,000 
(v) 500.0 
(vi) 2.0034
Round up the following upto three significant figures: 
(i) 34.216 
(ii) 10.4107 
(iii) 0.04597 
(iv) 2808
Match the following prefixes with their multiples:
S.NoPrefixesMultiples
(i)micro106
(ii)deca109
(iii)mega10–6
(iv)giga10–15
(v)femto10