# Q&A - Ask Doubts and Get Answers

## Filters

Clear All
You just finished “Physics and Measurement”. In this chapter, you have completed: 25 concepts 32 Doubts, Points to remember, Experiments to perform, Important term, General knowledge etc. 64 Number of Questions and Examples In this chapter, firstly you read Concepts of “Unit and dimension” and then moved to “Errors in measurement”. Apart from this, there are certain experiments and tips for...
You just finished â€œPhysics and Measurementâ€. In this chapter, you have completed: 25 concepts 32 Doubts, Points to remember, Experiments to perform, Important term, General knowledge etc. 64 Number of Questions and Examples In this chapter, firstly you read Concepts of â€œUnit and dimensionâ€ and then moved to â€œErrors in measurementâ€. Apart from this, there are certain...
While performing experiments, several errors can occur due to faulty equipment, carelessness of the person doing the experiment which can lead to the deviation of values from the original value. For higher accuracy and precision we study about errors in measurement.
No, you don't have to remember derivation of all the formulas. You just have to remember the formulas so that you can apply them while solving questions. You can easily memorize these formulas by practising questions.
If we are subtracting or adding two or more than two measurements, there is always the addition of error in both the cases i.e., addition or subtraction of two or more measurements.
Measurements that are close to the known value are said to be accurate, whereas measurements that are close to each other are said to be precise.
The smallest value that can be measured by the measuring instrument is called its least count.
No, the time period of simple pendulum only depends on the length of the simple pendulum and the value of acceleration due to gravity
Let's understand this with the help of an example: We know that the area of the circle is given by pi r^2 and its dimension is L2. But if we write the equation of the area of the circle as 2pi r^2, it's dimension will also be equal to L2. But 2pi r^2 is not the correct formula for the area of the circle. So, we can say that a dimensionally correct equation may or may not be correct.
Yes, it will change because when we convert from one unit system to another, those units have some relation between each other. So to maintain those relations we have to change the magnitude also. For example - 1 meter = 1000 millimeter
The value of the gravitational constant is
A physical constant, sometimes fundamental physical constant or universal constant, is a physical quantity that is generally believed to be both universal in nature and has constant value in time.
It is defined as the ratio of absolute permittivity to the permittivity of free space.
A superconductor is a material that can conduct electricity with negligible resistance.
No, practically there is nothing like ideal gas in this world. The concept of ideal gas is used just to make the equation and experiment simple.
The paper will absorb water and soon sink to the bottom of the glass but the needle will remain on the top of the water. This is due to surface tension.
Temperature in Kelvin is converted into Celsius by a formula given by:- T(K)=273.15+T(0C) Temperature in Celsius is converted into Fahrenheit by a formula given by:- T(F)=(9/5)T(0C)+32
Specific gravity is also called relative density and from the video, we know that the relative density is a dimensionless quantity. So the specific gravity is also a dimensionless quantity.
Force is defined as a push or pull on an object which results in the change of motion of the body. And, when we apply a force to a body for a small period of time, it creates an impulse known as impulse of the force.
If the unit is named after a person, the symbol is capitalized (first letter only), but the other letters are not capitalized. That's why, in Newton-metre, 'N' is capitalized because Newton (a unit of force) is named after Isaac Newton. Similarly, The Watt (after James Watt) for measuring units of power.
Exams
Articles
Questions