### Types of Physical Quantities

System of units : A complete set of units, both fundamental and derived for all kinds of physical quantities is called system of units. The common systems are given below (1) CGS system : The system is also called Gaussian system of units. In

### System of Units

System of units : A complete set of units, both fundamental and derived for all kinds of physical quantities is called system of units. The common systems are given below (1) CGS system : The system is also called Gaussian system of units. In it length, mass

### Applications of Dimensional Analysis

Application of Dimensional Analysis. (1) To find the unit of a physical quantity in a given system of units : In a dimensional formula, replacing M, L and T by the fundamental units of the required system we can get the un

### Limitations of Dimensional Analysis

Limitations of Dimensional Analysis.  (1) Dimensions are not unique. Two Physical Quantities can have same dimensions. For example torque and

### Dimensions

Dimensions of a Physical Quantity. The powers to which fundamental quantities must be raised in order to express the given physical quantity are called its dimensions. To make it more clear, consider the physical quantity force

### Energy and its Types

Energy The energy of a body is defined as its capacity for doing work. (1) Since energy of a body is the total quantity of work done th

### Measurement

Unit of measurements:- Fundamental units are those which are neither derived from one another nor can be dissolved. Eg. Units of mass, there are 7

### NCERT Solutions Exercise 1

Question 1: How many 3-digit numbers can be formed from the digits 1, 2, 3, 4 and 5 assuming that (i) repetition of the digits is allowed?

### NCERT Solutions Exercise 3

Question 1: How many 3-digit numbers can be formed by using the digits 1 to 9 if no digit is repeated? Answer 1: 3-digit numbers h

### NCERT Solution Exercise 3

Question 1: Find area of the triangle with vertices at the point given in each of the following: (i) (1, 0), (6, 0), (4, 3) (ii) (2, 7), (1, 1), (1

### Electrolytic Conduction

Electrolytic Conduction: - Substance that allows passage of electricity is called conductors. Sub. That does’t allow passage of electricity are called i

### Some Units and Definitions

Some Definitions and Units  Practical Units. (1) Length : (i) 1 fermi = 1 fm = 10–15m  (ii) 1 angstrom = 1Å = 10–10m = 10

### Surface Tension

Surface Tension (S.T.) âŸ¶ Surface tension of a liquid defied as the force acting at slight angles to the surface along one c

### Power

Power Power of a body is defined as the rate at which the body can do the work. Average power

### Small Test of Physics Basics

1.What is the difference between A

### Strain

The ratio of change in configuration to the original configuration is called strain. Being the ratio of two like quantities, it has no dimensions and units.

### Disaccharides

Disaccharides:- These are the carbohydrates which give two units of monosaccharides on hydrolysis. Some examples are: Sucrose, Lactose, Maltose.

### Carbohydrates

CARBOHYDRATES Carbohydrates were originally regarded as hydrates of carbon with general formula [Cx(H2O)y]. But this definition has

### Order of reaction

Order of reaction:- Sum of powers to which the concentration terms are raised in rate law expression Order of reaction = ∝ + β,

### Propagation of Errors

Propagation of Errors. (1) Error in sum of the quantities : Suppose   z = x + y Le

### NCERT Miscellaneous Exercise

Question 1: How many words, with or without meaning, each of 2 vowels and 3 consonants can be formed from the letters of the word DAUGHTER?

### Methods of expressing Concentration

Methods of expressing the concentration of Solution:- The concentration of a solution means the amount of solute present in the given quantity of

### DNA: Deoxiribonucleic acid

DNA: Deoxiribonucleic acid DNA is a thread like polymer of deoxyribonucleotides. The length of DNA is defined as number of nucleotides present in i

(1) The body which requires greater deforming force to produce a certain change in dimension is more elastic. Example : Ivory and steel balls are more elastic than

### Pressure

The normal force exerted by liquid at rest on a given surface in contact with it is called thrust of liquid on that surface. The normal force (or thrust) exerted by

### Work

Work: Work is said to be done when a force applied on the body displaces the body through a certain distance in the direction of force.

### Reproduction

Reproduction: Reproduction is the biological process in which an individual gives rise to an offspring similar to itself. Purpose of Reproduction:

### Behavior of Real Gases

Behavior of Real gases (Deviation from ideal behavior) Ideal gas is that which obeys ideal gas equation PV = nRT

### Some Important Definitions

(1) Time period : It is the least interval of time after which the periodic motion of a body repeats itself. S.I. units of time period is second.

### Rate of Reaction

Rate of reaction:- can be defined as the change in concentration of any one of reactant or product per unit time. R → P   Rate of re