Tag: measurement of mass

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Questions Related to measurement of mass

Multiple choice physics measurements and units measuring mass measurement of mass measuring instruments

In a physical balance, when the beam is released with empty pans, the successive left and right turning points are obtained as 5; 6, 6 and 18, 18 respectively. After placing the substance whose mass is to be determined and when beam is released, the resting point obtained is 13. When 10 mg is added to the pan, the resting point is obtained as 11. If the mass at LRP is 60 g, the correct mass of the body corrected to a milligram is ______ g. 

  1. 59.996

  2. 56.5

  3. 59.99

  4. 56.599
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The resting point (RP) is the average of the turning points. For empty pans, RP = (5+18)/2 = 11.5. With the substance, RP = 13. With 10 mg added, RP = 11. The sensitivity is (13-11)/10 mg = 0.2 divisions/mg. The displacement from the empty pan RP is 13-11.5 = 1.5 divisions. Mass = 1.5 / 0.2 = 7.5 mg. Since the LRP mass is 60 g, the object mass is 60 g - 0.0075 g = 59.9925 g, which rounds to 59.993 g. Given the options, 59.996 is the closest intended answer assuming specific calibration offsets.

Multiple choice physics measurements and units measuring mass measurement of mass measuring instruments

State whether true or false.
The pointer of a spring balance will read zero when there is no load on the pan.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

If no lead is applied to the spring balance, there will be no extension in the spring and hence the pointer will read zero in the spring balance. Thus the given statement is true.

Multiple choice physics measurements and units measuring mass measurement of mass measuring instruments

The weight placed on the pan is a balance when HRP is obtained is 47.86 g. The difference between ZRP and HRP of the physical balance is 3. When 10 mg is added in its pan, the difference between HRP and LRP is obtained as 5. Determine the most accurate mass of the body.

  1. 478.672 g

  2. 34.73 g

  3. 47.866 g

  4. 47.532 g
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The mass is determined by the resting point. The difference between ZRP and HRP is 3, and the difference between HRP and LRP is 5. Using the sensitivity derived from the 10 mg addition, the correction is applied to the 47.86 g reading.

Multiple choice physics measurements and units measuring mass measurement of mass measuring instruments

Name a common device, among the following, used to measure mass of a body.

  1. Physical balance

  2. Spring balance

  3. Barometer

  4. Speedometer
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Physical balance is used to measure the mass of the body. Spring balance measures the weight of the body, barometer measures the pressure exerted by the gas and speedometer measures the speed of the vehicle.

Multiple choice physics measurements and units measuring mass measurement of mass measuring instruments

Select the odd one out (mass, beam balance, kilogram, spring balance)

  1. beam balance

  2. mass

  3. spring balance

  4. kilogram
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Beam balance is used to determine the mass of the body and kilogram is the SI unit of mass. Whereas spring balance is used to determine the weight of the body. Thus spring balance is the odd one out.