Measure of two quantities along with the precision of respective measuring instrument is
A = 2.5ms-1 ± 0.5 ms-1 B = 0.10 s ± 0.01 s. The value of AB will be
(0.25 ± 0.08) m
(0.25 ± 0.5) m
(0.25 ± 0.05) m
(0.25 ± 0.135) m
You measure two quantities as A = 1.0 m ± 0.2 m, B = 2.0 m ± 0.2 m. We should report correct value for $\sqrt{AB}$ as
1.41 ± 0.4 m
1.41 m ± 0.15 m
1.4 m ± 0.3 m
1.4 m ± 0.2 m
Which of the following measurement is most precise?
5.00 mm
5.00 cm
5.00 m
5.00 km
The mean length of an object is 5 cm. Which of the following measurements is most accurate?
4.9 cm
4.805 cm
5.25 cm
5.4 cm
Young's modulus of steel is $1.9 \times 10^{11}$ N / $m^2$. When expressed in CGS units of dyne/cm2, it will be equal to (1N = $10^5$ dyne, 1 $m^2$ = $10^4$ cm2)
$1.9 \times 10^{10}$
$1.9 \times 10^{11}$
$1.9 \times 10^{12}$
$1.9 \times 10^{13}$