Which of the following pairs of physical quantities does not have same dimensional formula?
Work and torque
Angular momentum and Planck's constant
Tension and surface tension
Impulse and linear momentum
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