Tag: physics

Quizzes (598) Questions (13441)

Questions Related to physics

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.

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

A body is attached to a spring balance suspended from a stand. The reading on the balance is $0.5$kg. The two together are detached from the stand and allowed to fall through a height. While falling the reading in the balance will be.

  1. More than $0.5$ kg depending on the height

  2. Less than $0.5$ kg but not zero

  3. Zero

  4. $0.5$ kg
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When the spring balance and the body fall together, they are in a state of free fall. In this state, both the body and the spring balance experience the same acceleration due to gravity, meaning there is no net force exerted by the body on the spring. Consequently, the reading on the balance becomes zero.

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 physics measurements and units measuring mass measurement of mass measuring instruments

An object is suspended from a spring balance in a lift. The reading is $240 N$ when the lift is at rest. If the spring balance reading now changes to $220 N$, the the lift is moving 

  1. Downward with constant speed

  2. Downward with decreasing speed

  3. Downward with increasing speed

  4. Upward with increasing speed
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Since the apparent weight of the body decreases, the lift should move downward with some acceleration.
Multiple choice physics measurements and units measuring mass measurement of mass measuring instruments

A body is suspended from a spring balance kept in a satellite . The reading of the balance is ${ W } _{ 1 }$ when the satellite goes in an orbit of radius R and is ${ W } _{ 2 }$ when it goes in an orbit of radius 2 R. 

  1. ${ W } _{ 1 }$ = ${ W } _{ 2 }$

  2. ${ W } _{ 1 }$ < ${ W } _{ 2 }$

  3. ${ W } _{ 1 }$ > ${ W } _{ 2 }$

  4. ${ W } _{ 1 }$ $\neq $ ${ W } _{ 2 }$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A satellite in orbit is in a state of continuous free fall toward the Earth. Because the body inside the satellite is also in free fall, it experiences weightlessness regardless of the orbital radius. Therefore, the reading of the spring balance will be zero in both cases, making W1 equal to W2.