Physics · Science General

Newtonian Mechanics and Forces

1,605 Questions

Newtonian mechanics studies the motion of objects and the physical laws governing them. This hub covers friction, gravitational force, inertia, and vector quantities. Mastering these fundamental physics concepts is essential for various government competitive exams.

Laws of motionFriction and inertiaVector and scalar quantitiesGravitational accelerationArchimedes principle

Newtonian Mechanics and Forces Questions

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

Before using the beam balance why is the beam raised gently by raising the platform?

  1. To make one side of the beam balance heavy

  2. To ensure that the pointer swings equally on both sides of the zero mark on scale

  3. Both

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

Before using the balance, the plumb line is brought just above the pointed projection by adjusting the levelling screws at the base. The beam is then raised gently by raising platform $F$ using the lever and it is ensured that the pointer swings equally on both sides of the zero mark on scale, otherwise it is adjusted with the help of screw nuts. The beam is now lowered and the given object is placed on the left pan. The maximum approximate weight is placed on the right pan from the weight box with the help of forceps.

Then the lever is turned towards right so that the beam rises and the pointer begins to swing on either side. The side (left or right) to which the pointer moves more,

indicates less weight on that side. The standard weights are adjusted till the pointer either remains at the zero mark of scale or it swings equally on both sides of the zero mark. In this position, the total mass of weights on the right pan gives the mass of object.

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

Which of the following is not correct precaution taken while using beam balance?

  1. When near the actual weight, the weights should always be tried in the descending order

  2. The beam should be lowered each time before adding or removing weights from the pan

  3. The weights should be replaced into the weight box after weighting

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

Precaution taken while using beam balance. The weights should be carried with forceps. They should not be carried with bare fingers to avoid the change in its weight due to the presence of moisture and dust particles. Wet and hot objects should not be kept on the pan. When near the actual weight, the weights should always be tried in the descending order.

The beam should be lowered each time before adding or removing weights from the pan. The weight should be replaced into the weight box after weighting.

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

Which of the following is/are correct condition(s) for a True Balance?

  1. Both arms must be of equal lengths

  2. Both pans must be of equal weights

  3. Both A and B

  4. None of A and B
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A balance to the true, must satisfy the following two conditions:
1. Both arms must be of equal lengths, and
2. Both pans must be of equal weights.

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

The weights should be tried in descending order, for a beam balance, when we are :

  1. near the actual weight

  2. far from the actual weight

  3. measuring any weight as a constant practice

  4. making a rough estimation of the actual weight
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Using a beam balance, when we are near the actual weight, the weights should always be tried in the descending order.

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

Wet objects should not be kept on the pan as :

  1. the weight measured will be more than actual

  2. the weight measured will be less than actual

  3. the weight measured will be same as actual

  4. the pan may break down
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

If a wet object is kept on the pan of a beam balance, the weight measured will be more than usual.

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

The weights in a beam balance should not be carried with bare fingers

  1. to avoid change in weight due to moisture and dust

  2. to avoid change in weight due to chemical reactions

  3. just to make use of the forceps

  4. to avoid dropping of weights on the pan
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The weights for a beam balance should be carried with forceps. Those should not be carried with bare fingers to avoid the change in the weight due to  the presence of moisture and dust particles.

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

Mark the correct statement regarding to beam balance.

  1. The physical balance consists of a light and rigid beam of brass, a metallic pillar, a wooden base, two pans, a metallic pointer, and an ivory scale

  2. The device is enclosed in a box to avoid the effect of wind

  3. A weight box containing standard weights comes with the balance

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The physical balance consists of a light and rigid beam of brass, a metallic pillar, a wooden base, two pans, a metallic pointer, and an ivory scale.

The device is enclosed in a box to avoid the effect of wind. A weight box containing standard weights comes with the balance. The mass of a body is found by placing the body in one pan, placing some standard weights in the other, and then calculating it from the standard weights placed and the resting point of the pointer.

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

The mass at the resting point gives the correct mass of the body, : 

  1. if the resting point of a physical balance coincides with the zero resting point

  2. if the resting point of a physical balance coincides with a non-zero resting point

  3. if the resting point of a physical balance is tilted

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The mass of the resting point gives the correct mass of the body if the resting point of a physical balance coincides with the zero resting point.

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

Spring of spring balance must be _______ in nature.

  1. Elastic

  2. Non-elastic

  3. Rubber

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

Spring balance is used to measure the weight of the object. The working principle of spring balance is Hooke's law. Since Hooke's law is valid only for elastic objects, thus spring used in the spring balance must be elastic in nature.