Students and Teachers Forum
The development of any place or nation depends upon easy access to financial resources, human resources and natural resources Unavailability of any of the above-mentioned resources will have negative impact on the development in the following .....
Plant breathe through very small openings in their leaves called stomata. .....
Protozoa are the organisms which are made up of only one cell. Examples of protozoa are: Paramecium, Euglena, Amoeba, .....
To measure volume of gas, we can use: Displace fluid - This method can be used to calculate the volume of gas. The volume of fluid displaced would equal the volume of the gas. Use a gas syringe - This is a laboratory instrument that can be used to .....
The Sun is a huge, glowing sphere of hot gas. Most of this gas is hydrogen (about 70%) and helium (about 28%). Carbon, nitrogen and oxygen make up 1.5% and the other 0.5% is made up of small .....
Sea level is the base level for measuring elevation and depth on Earth. Sea level is the position of the air-sea interface which is taken as reference to measure all terrestrial elevations and submarine .....
Social evils are the practice of following the bad practices and traditions in the name custom and rituals. Any kind of practices or beliefs that have negative effect to the society may be termed as a social evil. Some of the factors that .....
Planetarium, theatre devoted to popular education and entertainment in astronomy and related fields, especially space science, and traditionally constructed with a hemispheric domed ceiling that is .....
Constellations are useful because they can help people to recognize stars in the sky. By looking for patterns, the stars and locations can be much easier to spot. The constellations had uses in ancient .....
An astronomical telescope is a telescope having an objective with a long focal length and an eyepiece with a short focal length, usually used for observing celestial .....
The astronomical telescope makes use of two positive lenses: the objective, which forms the image of a distant object at its focal length, and the eyepiece, which acts as a simple magnifier with which to view the image formed by the .....
Planetarium, is an educational device for showing the locations and movements of the planets and other objects in the universe. A modern planetarium is a complex optical instrument. It projects images of the planets, moon, and stars onto a domed .....
Some examples of constellation are : Ursa Major, Ursa Minor, Sagittarius, Aquarius, Draco, Cassiopeia, .....
A constellation is a collection of only very few stars. It appears to resemble the shape of an animal, human etc There are about 88 constellations named so .....
It is an optical instrument used to view heavenly bodies such moon,stars, planets and distant objects.
Working;
The rays coming from a distant object falls on objective as parallel beam at some angle .....
Some of the differences between individual and society are:
Individual
An astronomical telescope is an optical instrument which is used to see the magnified image of distant heavenly bodies like stars, planets, satellites and galaxies .....
Uranium-Thorium dating is based on the detection by mass spectrometry of both the parent (234U) and daughter (230Th) products of decay, through the emission of an alpha particle. The decay of Uranium 234 to Thorium 230 is part of the much longer .....
uranium-lead dating can be used to find the age of a uranium-containing mineral. It works because we know the fixed radioactive decay rates of uranium-238, which decays to lead-206, and for uranium-235, which decays to lead-207. So, we start out .....
आँखा, आँप, दायाँ, बायाँ, छायाँ, काइँयो आदि । आधा चन्द्रमाको माथि थोप्लो दिने कामलाई .....
1. T 2. T 3. F 4. .....
Three methods for determination of age of rocks are as follow. 1) Radiocarbon dating, 2) Potassium–argon dating 3) Uranium–lead .....
The age of a rock in years is called its absolute age. Geologists find absolute ages by measuring the amount of certain radioactive elements in the .....
1. displacement 2. negative 3. Velocity 4. .....
Some minerals found in Nepal are coal, limestone, coal, copper, dolomite, gemstones, gold, natural gas, graphite, iron ore,lead, .....
Non-identical twins are created when a woman produces two eggs at the same time and both are fertilised, each by a different sperm. The fertilised egg is called a zygote, and these non-identical twins are known as dizygotic or fraternal twins, .....
Materials occurring in the environment are nothing more than ‘neutral matter’ until people recognise their presence, attach great importance to them, and develop means to capitalise on them. Such materials that remain idealise unless .....
A fish scale is a small rigid plate that grows out of the skin of a fish. scales have various functions : Firstly, they protect the skin from attacks by predators, parasites and .....
Insulators are materials that do not allow the transfer or that slow the transfer of heat or electricity. Insulators can be made of many different types of materials but metals are generally not .....
Sex-linked inheritance is the appearance of a trait which is due to the presence of an allele exclusively either on X chromosomes or on Y chromosome. Example: Haemophilia. It .....
Non-identical twins are created when a woman produces two eggs at the same time and both are fertilised, each by a different sperm. The fertilised egg is called a zygote, and these non-identical twins are known as dizygotic or fraternal twins, .....
If the father of the normal visioned woman was colour blind, she might be a carrier, XC Xc. If the man is colourblind, he will have a genotype Xc Y. The offsprings: XC XC (carrier daughter), XC Y (normal son), Xc Xc .....
Differences The pair of chromosomes that regulate the somatic characters of the body are known as autosomes, whereas the pair of chromosomes that determines the sex of an organism, as they regulate the sex-linked traits are known as sex .....
It states that when two independent alleles are brought together at a time of gamete formation, they assort at random and freely.
When the cross is made between round yellow seeds and wrinkled green seeds, in F1 generation round is .....
When three coins are tossed at a time. The sample space will be S={(H,H,H),(H,H,T),(H,T,H),(T,H,H),(T,H,T),(T,T,H),(H,T,T),(T,T,T)} n(S)= 8. a. Let E1 be the event of getting one head and two .....
Joule is the SI unit of energy. Energy = 1/2 x mass ⨉ velocity2 Keeping their respective units we have, Energy = kg ⨉ (m/sec) 2 = kg m2 s-2 So, as Newton is dependent upon 5 fundamental units i.e kg, m, m, sec and sec. so, it is a .....
Newton is the SI unit of force. Force = mass ⨉ acceleration Keeping their respective units we have, Force= kg ⨉ m/sec2 = kg m s-2 So, as Newton is dependent upon 4 fundamental units i.e kg, m, sec and sec so, it is a derived .....
With the population of 800, Vatican City is the country with the least .....
There were many ways for the calculation of time. But none of them were scientific and easy. The Egyptians divided the day into two 12-hour periods, and used large obelisks to track the movement of the sun. They also developed water clocks, which .....
Development is a lifelong process of positive change. It aims to improve the living standard of people and makes life easier. In other words, any positive changes that happen in an individual, family, community, or in a country as a whole are .....
प्रश्नले भन्न खोजेको कुरा बुझिएन त .....
A system is an organization of varying numbers and kinds of organs so arranged that together they can perform complex functions for the body. Ten major systems include the skeletal, muscular, nervous, .....
Zenith is the point in the sky directly overhead. The zenith is an imaginary point directly "above" a particular location, on the .....
Benjamin Franklin is given credit for discovering electricity. .....
Underground water is the water present beneath Earth's surface in soil pore spaces and in the fractures of rock formations. Ground water can .....
Different types of watch are : Mechanical watch :It workson the basis of the oscillation of a simple pendulum. Quartz watch : It is a clock that uses an electronic oscillator that is regulated by a quatrz crystal to keep time. Atomic watch : It .....