Students and Teachers Forum
a3 - b3 - a + b = (a - b ) (a2 + ab + b2) - ( a - b ) = (a - b ) ( a2 + ab + b2 - 1 .....
A ray is a path of a light wave represented by a line with an arrow. The arrow indicates the direction of in which light is travelling. Beam of light: Bundle of rays of light are called beam of .....
Take a book infront of a candle or light. What happens? A shadow is formed. Take a transparent glass and keep it infront of a light source. What happens? Do you see any shadow? No, you don't. You know that, a shadow is formed when the .....
The objects which allow light to pass through it is termed as transparent bodies. For example :water,clear glass etc. The objects which does not allow light to pass through it, is an opaque object. For example: wooden door, wall .....
The objects which emit light of their own are called luminous objects. examples : star, firefly, etc The objects which donot emit light of their own are called non-luminous objects. Examples : moon, plastics .....
Light is a form of energy which causes the sensation of sight. 1.Natural sources of light are those which emit light naturally. While artificial sources of light are those which donot emit their own light and they are made by hujman. 2. Some of .....
Velocity ratio of a lever is 3 means distance travelled by effort is 3 times the distance travelled by the .....
Tradition can be defined as beliefs and practices upon which society is based on. It includes arts, language, religion, lifestyle and various other things that a society practices .....
Mass is defined as the quantity of matter contained in a body. Its SI unit is Kilogram Kg. It is measured using beam .....
The quantity which can be measured are called physical quantity. for example, mass, volume, length, .....
Solution : Time t = 3 years Rate r = 4% Amount A = Rs.392 Principal P = ? We know : A = P(1 + rt)
392 = P(1 + (3)(0.04) )
Evaluate the bracket:
392 = 1.12P
Switch sides:
1.12P = .....
Whenever there is an interaction between two objects, there is a force upon each of the objects. When the interaction ceases, the two objects no longer experience the force. Forces only exist as a result of an interaction. A force is a push or .....
An inverse function or an anti function is defined as a function, which can reverse into another function. In simple words, if any function “f” takes x to y then, .....
Human evolution is the lengthy process of change by which people originated from apelike ancestors. Scientific evidence shows that the physical and behavioral traits shared by all people originated from apelike ancestors and evolved over a period .....
If a body is at rest position, then, its velocity will be .....
Solution : first expression : x-y-2x+1 = -x-y+1 = - (x+y-1) 2nd expression : x-xy-x = -xy So, HCF = -1 amd, LCM = -1 .xy.(x+y-1) = .....
Given equation is, or, abx2 - aby2 + a2xy- b2xy = 0 or, ax(bx + ay) - by(bx + ay) = 0 or, (ax - by)(bx + ay) = 0 This means Either, ax - by = 0 .... ....(i) or, bx + ay = 0 ..............(ii) Equations (i) and (ii) .....
We know that Nepal is a nation of many legends. We have many national luminaries, beautiful and world-famous high Himalayan peaks, national parks, renowned arts and artifacts. We also get inspired by the people who have sacrificed their lives for .....
The highest number that divides exactly into two or more numbers. It is the "greatest" thing for simplifying fractions!
Example: The common factors of 15, 30 and 105
Factors of 15 are 1, 3, .....Consider, two numbers √4 and √5. We have, √4 = √22 = 2. So, √4 is not a surd. But, √5 cannot be further simplified. So, √5 is the surd. Surd is the type of number with .....
Solution : Total cash paid without VAT and Service charge = Rs.750 VAT amount = 13 % of 750 = 13/100 * 750 = Rs.97.5 Total cost with VAT = Rs.750 + Rs.97.5 = Rs.847.5 Service Charge = 10 % of 847.5=10/100 * 847.5 = Rs.84.75 Total amount .....
Since the Radius R of the earth at the poles is minimum, the value of acceleration due to gravity g is maximum, i.e. 9.83 m/s2. Similarly, the radius R of the earth at the equator is maximum , so the value of g is minimum, i.e. 9.78 m/s2. And, .....
You know that we all live on earth. Earth is spherical in shape like an orange. But we are all able to stay on this spherical earth.
It is because of the attractive force of the earth to pull us towards its center.
The force of .....Solution : SP = Rs.3700 CP = Rs.2900 Since, SP is greater than CP, there is profit. Profit P = 3700 - 2900 = Rs.800 Then, Profit Percent = P/CP * 100% = (800/2900) *100% = .....
Climate change may be defined as a significant change in the weather pattern of the given place that may persist over a longer period of time. Climate change is a global phenomenon that affects each and every part of world. Rich or poor it affects .....
Corolla is very important for pollination because it is the colorful part of the flower and helps to attract insects for pollination. Corolla also protects the reproductive organs of a .....
By the question. Mass(m) = 60 kg Distance (d) = no os steps * height of each steps = 15 * 30 = 450 cm = 4.5 m Time (t) = 15 sec Gravity (g) = 10m/s2. By the formula Power (p) = Work done .....
The organs of the body which respond to external stimuli by conveying impulses to the sensory nervous system are called sense organs. (eyes, nose tongue, ear, skin)
They help us to .....
Solution : Power P = 2 KW = 2000 W Time T = 2 hours = 2 * 60 * 60 = 7200 sec Energy Supplied E = ? We know, P = E / T or, 2000 = E / 7200 or, E = 14400000 .....
करण कुनै पनि सकारात्मक अर्थ बुझाउने वाक्यलाई करण भनिन्छ | यसले हो वा छ भन्ने सकारात्मक अर्थ .....
All viruses are totally parasitic and behave like living organisms inside the living host cell, while they are quite inactive and seem to be dead out of the host cell. Therefore, viruses are kept in the borderline of living and non-living .....
he seed in a plant is the part that develops from the ovules after fertilization. They are enclosed in the fruit which develops from the fertilized ovary. The seeds are formed as a result of sexual reproduction and contain the young embryo which .....
Solution : ( x , -2 ) = (3 , y ) so, x = 3 and y = .....
An ophthalmologist is a medical doctor (MD) or a doctor of osteopathic medicine (DO) who specializes in eye and vision care. Ophthalmologists are trained to perform eye exams, diagnose and treat disease, prescribe medications and perform eye .....
If the combustion is complete, we get carbon dioxide and if there is incomplete combustion, we get a mixture of carbon dioxide and carbon monoxide. Carbon monoxide in turn burns in air / oxygen and gives carbon dioxide.
So, we can say the .....
When Calcium Carbonate is heated in a test tube a colourless and odourless gas, carbondioxide gas is evolved and a white precipitate of Calcium Oxide is left behind in the test tube. CaCO3 .....
An ecosystem comprises both abiotic and biotic components of the environment. Green plants (producers) absorb water and minerals ie. abiotic components from the environement. All animals depend on green plants directly or indirectly for their .....
The distance covered by a moving body is the length of path covered by the body. Its SI unit is metre m. It is a scalar .....
We know that Nepal is a nation of diversity. More the 10 religions are practiced her. We have more than 125 castes and 123 languages. So, social custom may be defined as a set of behaviour exhibited by certain group or community during any kind .....
Solution : let constant acceleration is a distance travels in 20 seconds s = 0*20+a*20²/2 s = 200a -------------(1) distance travels in first 10 seconds s1 = 0*10+a*10²/2 s1 = 50a -----------------(2) distance travels .....