Crude oil is primary source of energy because crude oil is the raw oil obtained fr om mines and in the same form as it is available in .....

Hydropower is a pollution-free source of energy, as any fuel is not burnt to produce .....

Uranium and radium are radioactive .....

A water pump is based on the principle of atmospheric pressure. The atmospheric pressure i. e the pressure exerted by the atmosphere due to its weight cannot push up water up to 10 metre or .....

The instruments those work on the basis of Pascal’s law with their application are mentioned below: a. Hydraulic jack - Hydraulic jacks are used to lift heavy load. b. Hydraulic brake - Hydraulic brakes are used in cars and motorcycles. c. .....

Air pump works by the repetition of pulling and pushing activities of the piston. When the piston. When the piston is pulled, the volume of part A increases and it reduces pressure in this part. The air of part B at the atmospheric pressure .....

(Acceleration due to gravity, g = 9.8 m/s2)

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The ocean tides on earth are caused by both the moon's gravity and the sun's gravity. In general, ocean tides are not generated by the overall strength of gravity, but instead by the differences in gravity from one spot to the next. Even .....

Tides occur due to the gravity of the moon. As the mass of oceans water is greater than the mass of water on the lakes, there is more force of gravity between the ocean water and the moon. It results in the pull of the water due to which the ocean .....

The value of the gravity on the surface of moon is 1.652m/s2. Therefore, the value of escape velocity on the surface of moon is small. The velocity of the molecules of different gases is much above the escape velocity of the moon. That is why, all .....

Due to large surface area of the parachute, the air resistance will be more. As a result, the acceleration of the parachute decreases. The decreased acceleration due to gravity causes the person to fall down slowly. As a result of slow motion, .....

Weightlessness is a condition in which the effective weight of a body becomes zero. It is due to the zero reaction force of the earth or other heavenly bodies.  The SI unit of universal gravitational constant is Nm2/kg2.  Given, Mass of .....

The body will reach the ground faster from the poles because the value of g at poles is greater than the value of g at equator. So, more the value of g, less will be the time taken by a body to fall from the pole. Given, Mass of a body (m) = 20 .....

Newton’s Universal law of Gravitation states that, every object in the universe attracts every other object with a force which is called gravitational force. This gravitational force is (i) directly proportional to the product of their masses .....

We know, W∝g. The value of gravity ‘g’ is more at poles than at equator i.e. g ∝ 1/R2 as radius is less at poles compared to equator. Hence, weight of a body is greater at pole than at the equator. Given, Distance between two .....

From the figure, Mass of 1st object (M) = 200kg Mass of 2nd object (m) = 100kg Diameter of the 1st object = 14m Radius of the 2nd object = 5m Gravitational force between two masses (F) =? Here, radius of the 2nd object = 14/2 = 7 m Therefore, the .....

The acceleration due to gravity of body depends upon the mass of the body. In comparison to earth, moon has less gravity because mass of moon is less than the mass of the earth. So, one can jump higher on the surface of the moon than on the surface .....

Haat bazaars have been vital to the lives of rural communities for quite some time. They are primarily set up for trading of goods and services that are locally produced. They also allow the community to sell or purchase goods that are not locally .....

रामु कथाकार गुरुप्रसाद मैनालीद्वारा रचित ‘प्रत्यागमन’ कथाको प्रमुख एवम् केन्द्रीय पुरुष .....

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When we cool the solution faster, many crystals begin to grow at once.

The crystals collide to each other.

They don't have time to grow large before they collide with other growing crystals.

When we cool the solution .....

Suspension is a heterogeneous mixture of fluid that contains solid particles sufficiently large for sedimentation. For example; a suspension of mud in water, a suspension of flour mixed in a glass of water, a mixture of sand and water where sand .....

Initial velocity (u) = 72 km/hr = m/s = 20m/s Time taken (t) = 4 seconds Final velocity (v) = 0 m/s (Since the truck finally comes at rest, v = 0m/s) Retardation (-a) =? Distance travelled (s) =? We know that, Acceleration (a) = = = = -5 m/s .....

Some examples of non-living things are : chair, table, books, bed, newspaper, clothes, bed sheets, curtains, bag, pen , pencil, inkpot, .....

You may have looked up into the sky. It is blue in .....

Some example of books that you study are : Science Maths English Nepali .....

Some popular games are : Football  Cricket Badminton volleyball , .....

The constitution is a legal framework based upon which all the branches of a nation works. It provides framework for the formulation of all other laws. It is written in a way that includes the will and aspiration of the people. The reasons are as .....

Those organizations that purely founded to provide social service are called social service organizations. Social service organizations are established according to the need of the people in society. Nepal Redcross Society, Nepal Scout, Maiti .....

If someone lost in a fair I would talk to him/her first. Then I would talk to my parents. After that, we would bring him or to the local police .....

Henry Dunant in 1859 AD came up with the idea of the Red Cross after a bloody battle in Solferino, Italy. Some of the service provided by the Red Cross society are: help the injured in any kind of disaster like war, flood, earthquake and .....

The Red Cross Society is an international humanitarian organisation. It was primarily founded for providing medical care for war casualties. It was founded by by Henry Dunant and Gustave Moynier in 1863 .....

Language: Nepal is a beautiful country decorated with different colours of various languages. .....

In nuclear fusion, ligher nuclei like hydrogen fuse together to form a heavier nucleus like helium nucleus with the release of energy. 21H2 + 21H2 ---------------------> 2He4 + 21e0 + Energy -----    .....

The longest bone in the human body is the femur or thigh bone which contains about 1/4 of the height of an .....

 The force of gravity keeps all of the planets in orbit around the sun. Gravity is the force by which a planet or other body draws objects toward its center.  Why do things fall down when you throw them or drop them? The answer is .....

Solution : 2years = 2 * 365 days = 730 days = 730 * 24 hours = 17520 .....

Solution : 645.7 = 6.457 x .....

Solution : acceleration a = 100 m/s2 mass m = 10 metric ton = 10 x 1000 Kg = 10000 Kg Force F = ? We know, F = m x a =  100 x 10000 = 1000000 N Thus, the magnitude of force is 1000000 .....

Solution, 1000 mg = 1 gm or, 1 mg = 1/1000 gm or, 75 mg = 75/1000 gm = 0.075 .....

Solution : 1 Km = 1000 m or, 4 Km = 4 * 1000 m = 4000 .....

Solution : 1 km = 1000 m and, 1 m = 100 cm so, 1 km = 100000 cm and, 40 Km = 40 *100000 = 4000000 .....

In general, 1 month is the time duration of 30 .....

Pine plants grows in warm and cold climate. The camel is an animal of  hot .....

Some aquatic animals are fish, octopus, whale, frog, duck, .....

Some of the desert animals are snake, scorpion, spiders, camel, rats, .....

Perennial plants are those plants which are expected to live more than two years.

Perennials may go to seed every year and may even die back to the ground at times, but their root systems are very much alive and the plants will continue growing .....

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Nocturnal animals are awake and active at night and then sleep during the day. Some nocturnal animals can be seen during the day, but most of them spend their whole day resting. Examples of nocturnal animals include bats, skunks, aardvarks, .....

Plants that are found inside water are chara, hydrilla, vallisneria, utricularia, ceratophyllum, .....