20 Physics -- Physical Quantities

NEB Model Question PHYSICS XI

NEB MODEL QUESTION FOR PHYSICSClass: 11For: 2070Time : 3 hrsFull Marks: 75Pass marks: 27Group ‘A’ Q.1. Answer in brief, any SIX questions. [2 X 6 = 12] (a) What is the difference between accurate and precise measurements?(b) A ball having a momentum P hits a bat and its momentum becomes...

What is Q1 (e) ?

1 Answers

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Ohh I got it:

Q: Why is sand thrown on roads covered with snow?

A: Sand is thrown on roads covered with snow because when the tracks/ roads are covered with snow there is a reduction of friction between the tires of the vehicles and the road and during this situation it is dangerous to drive. when sand is thrown on the roads covered with snow then the friction increases between the road and the tire of the vehicle, and safe driving is possible.

Bujhena maile🤧

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what is the role of physics and chemistry in daily life? How can yo co-relate them with each other?

The foods we eat, the air we breathe, cleaning chemicals, our emotions and literally every object that we can see or touch, love, jealousy, infatuation and all share in chemistry. For all living things to function and survive, their bodies perform various chemical processes.

pg second ko 5 ko eg ma tyo sf 3 hola ne. #plzrecheck

That is correct, @UNKNOWN! 7.00 indeed has three significant figures.

Sorry about the typo.

Displacement of a particle is given by y=Asin Bx+C sin Dt where x is distance and t is time. Find the dimension of the constant. Find the dimension of constant B/D.

Dimension of angle is [M⁰L⁰T⁰], So, the A and C have dimension [L]. Since, x is a distance and t is time, B and D have dimensions [L^-1] and [T^-1] . Their ratio has dimension[L^-1T].

'Precision describes the limitation of the measuring instrument'. Is the statement true?

Precision is a measure of statistical variability. It describes random errors which is caused by permanent, unpredictable fluctuations of measuring instrument. In other words, it basically describes closeness of the measured values. For example, you used normal ruler to measure length of certain object and now you have used a Laser Interferometer to measure the same object . Of course, there will be more precision in latter one as there will be more fluctuations in previous one, which shows...

Give an account on plant morphology?

Can two or more than two quantities have the same dimensions?

1) Two physical quantities can only be equated if they have the same dimensions.

2) Two physical quantities can only be added if they have the same dimensions.

3) The dimensions of the multiplication of two quantities is given by the multiplication of the dimensions of the two quantities.

What is the difference between accurate and precise measurement?

What is order of magnitude in physics?

The order of magnitude of a physical quantity isits magnitude in powers of ten when thephysical quantity is expressed in powers of ten with one digit to the left of the decimal.

Orders of magnitude are generally used to make very approximate comparisons and reflect very large differences.

Is dimensionally correct equation necessarily physically correct? What about dimensionally wrong equation?

A dimensionally correct equation need not be actually correct, but a dimensionally incorrect equation is necessarily wrong.

Can there be a physical quantity which has no unit and dimension? Can a quantity have a unit without dimensions?

There is no physical quantity, which has dimension but no unit.

Because if a physical quantity has a dimension then it definitely has a unit.

why is sky seen blue in color?

The sky is blue due to a phenomenon called Raleigh scattering. This scattering refers to the scattering of electromagnetic radiation (of which light is a form) by particles of a much smaller wavelength.

Is it a better approach to define terminologies in Physics using mathematical equations or expressions? What are the demerits of not using physical definitions?

it (rain)all this evening

It has been raining all this evening

Just randomly thinking.What's physics behind domino effect??

The physics behind the domino effect, also known as the domino theory, is based on the principles of transfer of energy and momentum. When one domino falls, it transfers its energy to the next domino through the process of collision, causing the next domino to fall as well. This transfer of energy and momentum continues down the line of dominoes, resulting in a chain reaction.

The domino effect can be explained using the principles of Newton's laws of motion. According to the first law, an...

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