Tag: measuring instruments

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Questions Related to measuring instruments

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

State whether given statement is True or False.
When a weight is hung on a spring, the spring's extension is proportional to the weight.

  1. True

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

Spring balance is used to measure the weight of the object. To do so, the object is hung on the spring which in result stretches the spring. The spring's extension is proportional to the weight which gives the weight of the object.

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

State whether given statement is True or False.
Under no-load condition, the pointer of the spring balance must point at the zero mark of the scale. 

  1. True

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

The above statement is true that the pointer of the spring balance must point at the zero mark of the scale when no load is applied to it.

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

In the arrangement shown, the pulleys are fixed and ideal, the strings are light, $m _{1} > m _{2}$ and $S$ is a spring balance which is itself massless. The reading of $S$ (in units of mass) is

  1. $m _{1} - m _{2}$

  2. $\dfrac {1}{2}(m _{1} + m _{2})$

  3. $\dfrac {m _{1}m _{2}}{m _{1} + m _{2}}$

  4. $\dfrac {2m _{1}m _{2}}{m _{1} + m _{2}}$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The acceleration of the system $= \left (\dfrac {m _{1} + m _{2}}{m _{1} + m _{2}}\right )g$ and hence the tension $T$ in the string is $\left (\dfrac {2m _{1}m _{2}}{m _{1} + m _{2}}\right )g$. The reading of the spring balance is $T$ (in units of force) and $\dfrac {T}{g}$ (in units of mass).