Physical measurement 2

nano seconds = ............... microseconds

• 10⁴

• 10^-6

• 10^-3

• 1000

If the dimensional formula is ML^-3 T⁰ and its measuring unit is Kg^x/m^y

• x=1 , y=2

• X=2, Y=-1

• x= 1, y=3

• x=1, y= -3

when measuring the mass of a person it was found to be 75.25 Kg and by investigation it was found that the measurement was made by an error of 0.01Kg, then the mass of the person may equal ..........

• 75.26

• 75.35

• 75.24

• 71.25

• 0.029%

• 0.025%

• 0.028%

• 0.03%

If the dimensional of A= L²T and the dimensions of B are LT², then the dimensions of the quantity A -3B

• L³T³

• LT

• L²T²

• not defined

Answer explanation

To make addition or subtraction to dimensional formula they must have same dimensional formula

• 0.2515 s

• 4 s

• 250.15s

• 1750s

which device measure the mass of small ring

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A group of students measure the velocity of a moving body, which of these measurements is more accurate?

The most accurate tool for measuring the time taken by an object to fall from the top of a building is

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Which pair from the following quantities quantities represents derived quantities in the the international system of units?

• Area and force

• Distance and acceleration

• Velocity and time

• Energy and density