Tag: measurement of mass

Questions Related to measurement of mass

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

A body is suspended on a spring balance in ship sailing along the equator with a speed $V$. If $\omega$ is the angular speed of the earth and ${W} _{0}$ is the scale reading when the ship is at rest, the scale reading when the ship is sailing will be very close to:

  1. ${W} _{0}$

  2. ${W} _{0}(1+\cfrac{2\omega V}{g})$

  3. ${W} _{0}(1\pm\cfrac{2\omega V}{g})$

  4. none of these

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

The Coriolis force affects the apparent weight of an object on a moving ship. The change in weight depends on the direction of travel relative to the Earth's rotation, leading to the +/- term.

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

Find the reading of the spring  balance, when the elevator  is going  up with an acceleration of g /10 the pulley is smooth 

  1. 3.1 kg

  2. 4.4 kg

  3. 1.8 kg

  4. 6.2 kg

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

This involves a pulley system in an accelerating elevator. The effective acceleration is g + a. The tension in the string for a pulley system with masses m1 and m2 is T = 2 * m1 * m2 * (g+a) / (m1 + m2).

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

A person of mass 50 kg stands on a weighing scale on a lift. If the lift is descending with a downwards acceleration of $9 ms^{-2}$, what would be the reading of the weighing scale ? $(g = 10 ms^-2)$

  1. 5 kg

  2. 10 kg

  3. 15 kg

  4. 20 kg

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

The apparent weight is W = m(g - a). Here, W = 50 * (10 - 9) = 50 * 1 = 50 N. In terms of mass reading, this is 5 kg.

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

The weight of a balloon is $W _1$ when empty and $W _2$ when filled with air. Both are weighed in air by the same sensitive spring balance and under identical condition. Then

  1. $W _1=W _2$, as the weight of air in the balloon is offset by the force of buoyancy on it

  2. $W _2 < W _1$, due to the force of buoyancy acting on the filled balloon

  3. $W _2 > W _1$ as the air inside is of a greater pressure and hence has greater density than the air outside

  4. $W _2=W _1+$ weight of the air inside it

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

When the balloon is filled with air at higher pressure, the density of the air inside is greater than the density of the air outside, making the filled balloon heavier.

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

Which of the following is not true of the standard weights and Measures? 

  1. Larger weights are made of iron

  2. Smaller weights are made of lead

  3. The value is written on the top

  4. They are either hexagonal or circular in shape

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

Standard weights are typically marked with their value on the top, making this a true statement about their design.

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

What principle is used In a  newton spring balance?

  1. The mass of an object depends on its density.

  2. The mass of an object depends an the gravity pulling

  3. The weight of an object is directly proportional to its mass.

  4. The extension of the spring is directly proportional to the force pulling it.

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

A spring balance operates on Hooke's Law, which states that the extension of a spring is directly proportional to the force applied to it.

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

Which of the following principle helps in the measurement of mass of the planets?

  1. Einstein's theory of relativity

  2. Newton's Law of gravitation

  3. Newton's Law of cooling

  4. Parallax Method

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

With the help of Newton's law of gravitation we can measure mass of planets.

Newton's law of universal gravitation states that a particle attracts every other particle in the universe using a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

$F=\dfrac { G{ m } _{ 1 }{ m } _{ 2 } }{ { r }^{ 2 } } $   where $m _1$ amd $m _2$ are mass of planets, and $r$ is the distance between them  and $G$ is gravitation constant.
From this we can measure mass of planets.