Physics · General Awareness

Physics Measuring Instruments

1,180 Questions

Physics measuring instruments are essential tools used to measure various physical quantities. This topic covers devices like hygrometers, oscilloscopes, and sphygmomanometers. It is a highly scoring section in general science and general awareness examinations.

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Physics Measuring Instruments Questions

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

Objects measured in beam balance should be

  1. hot and wet

  2. hot but not wet

  3. wet but not hot

  4. neither hot nor wet
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

Burette and Pipette are used to measure mass

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
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.
Multiple choice physics measurements and units measuring mass measurement of mass measuring instruments

The weights should be carried with forceps to :

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

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

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

A false balance is such that the beam remains horizontal when the pans are empty. An object weighs ${ w } _{ 1 }$ when placed in one pan and ${ w } _{ 2 }$ when placed in the other pan. Then the weight W of the object is

  1. $\sqrt { { w } _{ 1 }{ w } _{ 2 } } $
  2. $\dfrac { { w } _{ 1 }+{ w } _{ 2 } }{ 2 } $
  3. $\dfrac { 2 }{ \sqrt { { w } _{ 1 }^{ 2 }+{ w } _{ 2 }^{ 2 } } } $
  4. $\sqrt { \dfrac { { w } _{ 1 }^{ 2 }+{ w } _{ 2 }^{ 2 } }{ 2 } } $
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

For a false balance with equal arm lengths but unequal pan weights or other systematic errors, the true weight is the arithmetic mean of the weights obtained in the two pans: W = (w1 + w2) / 2.

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

We can measure weights using both spring and beam balance. But on moon, which one will give accurate measuring ?

  1. Beam Balance

  2. Spring Balance

  3. Both

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

Spring balance is used to measure the weight of the body whereas beam balance is used to measure the mass of the body. Since the mass of the body remains the same on earth as well as on moon but the acceleration due to gravity differs. So, the beam balance gives the same value of mass of body on earth and moon but spring balance gives different values of weight. So we can measure the mass of body on moon by beam balance and then multiply it by $g = 9.8 \ m/s^2$ to get the weight which would be more accurate.

Multiple choice

What is the variable in an experiment?

  1. the glass tubes you use

  2. the thing you want to test

  3. the questions you ask

  4. the part that stays the same
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In an experiment, the variable is the specific factor or condition that is changed or manipulated to see how it affects the result. It is the 'thing' being tested.

Multiple choice physics measurements and experimentation measuring distance of celestial bodies unconventional units of measurements units of mass

1 light year is equal to 

  1. $\displaystyle 6.3\times { 10 }^{ 5 }\overset { o }{ A } $
  2. $\displaystyle 6.3\times { 10 }^{ 4 }$$AU$
  3. $\displaystyle 3.0\times { 10 }^{ 16 }{ ms }^{ -1 }$
  4. $\displaystyle 6.3\times { 10 }^{ 4 }\overset { o }{ A } $
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
We know that   $1 \ light year  = 9.46\times 10^{15} \ m$
Also,   $1 \ AU = 1.5\times 10^{11} \ m$
Thus   $1 \ light year  = \dfrac{9.46\times 10^{15}}{1.5\times 10^{11}}  \ AU= 6.3\times 10^4 \ AU$
Multiple choice physics measurements and experimentation measuring distance of celestial bodies unconventional units of measurements units of mass

 _______________displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines.

  1. Echo

  2. Parallax

  3. Triangulation

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

Parallax displacement or difference in the apparent position of an object vied along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines.