Tag: physics

Questions Related to physics

When we are near to getting the actual weight in a beam balance, standard weights should be tried in :

physics measurements and units measuring mass measurement of mass measuring instruments

  1. decreasing order

  2. increasing order

  3. either increasing or decreasing order

  4. at random

Show answer
Correct Option: A
Explanation:

When we are near to getting the actual weight in a beam balance, standard weights should be tried in decreasing order.
Meanwhile, let us look at the precautions in using a beam balance: 
1. The weight should be replaced into the weight box after weighing. 
2. Wet and hot objects should not be kept on the plan. 
3. When near the actual weight ,weights should be tried in decreasing order. 
4. The beam should be lowered before adding or removing weights from the pan. 
5. The lever should be turned gently ,in order to prevent the knife edges from chipping.

Objects measured in beam balance should be

physics measurements and units measuring mass measurement of mass measuring instruments

  1. hot and wet

  2. hot but not wet

  3. wet but not hot

  4. neither hot nor wet

Show answer
Correct Option: D
Explanation:

While weighting an object using a beam balance, it should be ensured that the object is neither wet nor hot.
Meanwhile, let us look at all the precautions in using a beam balance: 
1. The weight should be replaced into the weight box after weighing. 
2. Wet and hot objects should not be kept on the plan. 
3. When near the actual weight ,weights should be tried in decreasing order. 
4. The beam should be lowered before adding or removing weights from the pan. 
5. The lever should be turned gently ,in order to prevent the knife edges from chipping.

An object is weighed in the following places using a spring balance. In which place will it weigh the heaviest?

physics measurements and units measuring mass measurement of mass measuring instruments

  1. On the Moon

  2. At the equator

  3. At the pole

  4. In outer space

Show answer
Correct Option: C
Explanation:
Acceleration due to gravity $g$ is the largest at the pole of the earth.
Weight of the object $W = mg$
$\implies$ $W\propto g$
Thus the object will weigh the heaviest at the pole of the earth

Which of the following devices are used for the measurement of mass?

physics measurements and units measuring mass measurement of mass measuring instruments

  1. Simple pendulum

  2. Beam balance

  3. Electroscope

  4. Microscope

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Correct Option: B
Explanation:

option B is correct 

As simple pendulum is used for measuring time period 
and electroscope and microscope are used to see very tiny particles

Burette and Pipette are used to measure mass

physics measurements and units measuring mass measurement of mass measuring instruments

  1. True

  2. False

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Correct Option: B
Explanation:
Burette and pipette are the volumetric glassware that are used to measure the volume of liquids (or solutions) mostly in chemistry laboratory. On the other hand mass is the amount of matter in an object which most commonly measured using balance.
Hence, given statement is false.

Which of the following should not be weighed directly in contact with a balance pan?

physics measurements and units measuring mass measurement of mass measuring instruments

  1. glass

  2. ceramics

  3. laboratory chemicals

  4. metal objects

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Correct Option: C
Explanation:

balance pan can be used to measure the weight of glass, ceramics as well as metal object but it cannot be used to measure the weight of laboratory chemicals directly as the chemicals can react with the base of pan. Also, weight measurement of the chemicals used need to be very accurate, of teh order of milligram as well, which cannot be done with balance pan.

Which of the following is not conducive to an accurate measurement of mass on a beam balance?

physics measurements and units measuring mass measurement of mass measuring instruments

  1. Isolated surroundings

  2. Still air

  3. Air currents

  4. None of these

Show answer
Correct Option: C
Explanation:

Air currents is not conducive to an accurate measurement of mass on a beam balance.

The weights should be carried with forceps to :

physics measurements and units measuring mass measurement of mass measuring instruments

  1. avoid impressing fingerprints on the weights

  2. avoid heat exchange

  3. avoid the change in its weight due to the presence of moisture and dust particles

  4. none of these

Show answer
Correct Option: C
Explanation:

The weights should be carried with forceps to avoid the change in its weight due to the presence of moisture and dust particles.

The humidity of air surrounding the balance installation should be :

physics measurements and units measuring mass measurement of mass measuring instruments

  1. zero

  2. high

  3. it doesn't matter

  4. low

Show answer
Correct Option: D
Explanation:

The humidity of air surrounding the balance installation should be low.

The temperature of the objects placed on either pans of the beam balance should be :

physics measurements and units measuring mass measurement of mass measuring instruments

  1. different

  2. same

  3. room temperature

  4. the respective freezing points

Show answer
Correct Option: C
Explanation:

The temperature of the objects placed on either pans of the beam balance should be room temperature.