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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.

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

Before using the beam balance why is the beam raised gently by raising the platform?

  1. To make one side of the beam balance heavy

  2. To ensure that the pointer swings equally on both sides of the zero mark on scale

  3. Both

  4. None
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Before using the balance, the plumb line is brought just above the pointed projection by adjusting the levelling screws at the base. The beam is then raised gently by raising platform $F$ using the lever and it is ensured that the pointer swings equally on both sides of the zero mark on scale, otherwise it is adjusted with the help of screw nuts. The beam is now lowered and the given object is placed on the left pan. The maximum approximate weight is placed on the right pan from the weight box with the help of forceps.

Then the lever is turned towards right so that the beam rises and the pointer begins to swing on either side. The side (left or right) to which the pointer moves more,

indicates less weight on that side. The standard weights are adjusted till the pointer either remains at the zero mark of scale or it swings equally on both sides of the zero mark. In this position, the total mass of weights on the right pan gives the mass of object.

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

The beam should be _________ each time before adding or removing weights from the pan.

  1. raised

  2. lowered

  3. Both

  4. None
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The beam should be lowered each time before adding or removing weights from the pan. The weight should be replaced into the weight box after weighting. The lever should be turned gently, in order to prevent the knife edges from chipping.

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

Which of the following is a correct about precautions to be taken while using beam balance?

  1. The weights should be carried with foreceps

  2. They should not be carried with bare fingers to avoid the change in its weight due to the presence of moisture and dust particles

  3. Wet and hot objects should not be kept on the pan

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Precaution taken while using beam balance. The weights should be carried with forceps. They should not be carried with bare fingers to avoid the change in its weight due to the presence of moisture and dust particles. Wet and hot objects should not be kept on the pan. When near the actual weight, the weights should always be tried in the descending order.

The beam should be lowered each time before adding or removing weights from the pan. The weight should be replaced into the weight box after weighing.

The lever should be turned gently, in order to prevent the knife edges from chipping.