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Centrifugation is a technique which involves the application of centrifugal force to separate particles from a solution according to their size, shape, density, the viscosity of the medium and rotor speed.  This process is used to .....

Distillation is a widely used method for separating mixtures based on differences in the conditions required to change the phase of components of the mixture.  To separate a mixture of liquids, the liquid can be heated to force components, .....

The mass movement of 2046 BS. may be defined as a political event by major political parties for the restoration of democracy. It began on 7th. Falgun 2046 BS. and ended on 26th. of Chaitra. Some of the major are: End of the Panchayati system of .....

You know sporulation is the method of asexual reproduction which takes place by means of spores. This method is common in Mucor, Moss, Fern, Marchantia, Rhizopus .....

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Let, ∡0CB=x and  ∡OBC=y. Then, in triangle, ABC,  ∡A+∡ACB+∡ABC=180 [sum of anlges of triangle] or, ∡A + 2x + 2y  = 180      or, x + y =  [ 180o - .....

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Nepal is a country which is rich in water resources. The high flowing rivers of possess tremendous potentialities. Gandaki, Tama Koshi, Arun, Karnali, etc. are surging rivers. The water of these rivers possess terrific potentialities with regard .....

As you know that smoking is injurious to health. It causes various diseases such as heart diseases, lung cancer and many another chronic disease which will make serious damage to your body and unable to function.  You may have seen that the .....

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Here, We have given ,  √3 x + y = √3 Now, √ [(coefficient of x)2 + (coefficient of y)2 ]         = √ [ (√3 )2 + 12]          = .....

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Nepal is a country that is rich in water resources. The high flowing rivers of possess tremendous potentialities. Gandaki, Tama Koshi, Arun, Karnali, etc. are surging rivers. The water of these rivers possess terrific potentialities with regard .....

पुस्तक ज्ञानको भकारी हो । सार्वजनिक रुपमा विभिन्न पाठकहरुले आफ्नो नियम परिधिभित्र रहेर .....

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स्वतन्त्रता, समानता र बान्धुत्व लोकतन्त्रको आधार हुन् । तीनै कुरालाई आत्मसात् गर्न सकिए .....

Here, Volume of tank = V = π r2 h              , where r = radius  and h = height. or, 462000/ 1000  m3 = 22/7 x (3.5m)2 x h or, h = 462 x 7 / ( 22 x 12.25) m    .....

B.C. stands for Before Christ, and it means the number of years before the birth of Jesus Christ. That was about 2000 years ago, so the date 509 BC means 2509 years ago. Hence, the Roman civilization lasted for 2509 + 476 = 2985 .....

Using formula, a2 + b2 = (a + b)2 - .....

Here, Equation of AB which passes through (4,0)  and (0,4) is  y - y1 = [ y2 -y1]/ [ x2 - x1]  [ x -x1] or, y - 0  = [ 4 - 0]/ [ 0 - 4]  [ x -0] or, x + y - 4 = 0...................i) Equation of CD .....

The formula for calculating the sum of the interior angles of a regular polygon is:                                       .....

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Following are the reasons behind the violation of social rules: - Poor implementation of laws. - Lack of discipline in the people. - Lack of sense of responsibility. - Lack of .....

Fig: Sunflower and its .....

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Frequency is the total cycle complete per second. Its unit is Hertz (Hz). and  Hertz = 1 / Time taken Hz = 1 / s since it is a ratio of fundamental quantity and its unit depends upon time ( a fundamental unit ). Thus, it is a derived .....

1 is not prime because of the definition of prime. Prime is “An integer greater than one is called a prime number if its only positive divisors (factors) are one and itself” So to a number be prime it need to be greater than .....

Let's say velocity of sound = v time taken = t distance between the source and reflector = d We hear the sound (echo) once produced after reflection. for this to happen, sound must travel a total distance of 2d. Now,  velocity = .....

Frequency is the number of complete cycle produced in one second. They frequency of sound is 20 Hz means that 20 complete cycle are produced in one second. These complete cycles are the wave that defines the disturbance in the system. In the .....

A community is a group of people with diverse characteristics. They are linked by social ties, share common perspectives and engage in joint action in geographical locations or settings. So, the socio-cultural and geographical interactions between .....

The living characteristics of a viruses are: 1. The DNA / RNA and protein are the constituents of virus. 2. They reproduce within host cells. 3. They have ability to .....

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There are some important features which helps birds to fly. Some of them are: Their body is light-weight Their body is cyclindrical They have feathers which flaps in the air They have hollow .....

Let L be the side of square garden. Then  Area  = 625m2    or, L2 =  625m2    or, L = √ 625m2    Or, L = 25m Now,  Perimeter of square garden =  4L = 4 x 25m  = .....

Bacteria is neither plant or animals. Explanation: It is a old concept of classifying the living beings into plants or animals. Bacteria belongs to prokaryotes (with no nucleus). There are 3 types of bacteria. They .....

A share is a unit of ownership in a company. In other words, when you buy shares of a company, you become part owner of the company and have the rights to share from the fortune of the company and contribute to major decisions. Some of the major .....

11. Ans. Here, A = Cerebellum            B= Pons .....

The environment seems green and tidy. There is a good garden full of flowers, grasses, and trees which are protected and planted. They are also well taken care. Any dirt, dust, wrappers, papers, etc. are collected everyday and thrown at .....

The mixture of unwanted substances in the environment is called Environment Pollution. This mixture can be in the air, water , soil of the environment. Anything that harms the nature and its components can be understood as the environment .....

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We know, SinA=p/h cosA=b/h tanA=p/b=sinA/cosA cotA=b/p=cosA/sinA secA=1/cosA=h/b cosecA=1/sinA=h/p Here, We know, from p,b and h relation,cosecA=√[cot2A+1]  SinA=1/cosecA=1/ √[cot2A+1]  tanA=1/cotA similarly do .....

The main organ in the respiratory system is lungs which helps to take in oxygen and throw out carbon dioxide. Air contains oxygen as well as other gases. These gases are inhaled inside our body from nose. It then go to pharynx, larynx, trachea, .....

3. Allow the liquid to cool down slowly which forms glass. The glass, thus prepared, is called ordinary glass or sodalime glass. It is also called soft glass because it easily soften on heating. The composition of the ordinary glass is .....