# Archives

## Rationalise the equation âˆš3-1/âˆš3+1

Answer: Given (âˆš3 - 1)/(âˆš3 + 1) To rationalize the given equation we will multiply and divide the denominator by (âˆš3 - 1) â‡’ (âˆš3 - 1)(âˆš3 -... View Article

## When concentration of solutes is low in plant cell , absorption of water is ?

When the concentration of solutes is low in plant cells, the absorption of water is retarded. In this process exosmosis takes place. The movement... View Article

## In which state of matter does fire exists?

Fire is in the plasma state. It is considered as the fourth state of matter after solid, liquid, and gas. Plasma is a state which comprises of... View Article

## Why is carboxylic acid weaker than HCl ?

Carboxylic acid weaker than HCl due to the following reasons: Ions of carboxylic acid do not dissociate completely in water Carboxylic acid... View Article

## Name the raw materials needed for photosynthesis.

Answer: Photosynthesis is the process in which green plants use sunlight to make their own food. Photosynthesis requires sunlight, chlorophyll,... View Article

## Why do all objects have tendency to fall towards the earth when thrown up

All objects have a tendency to fall towards the earth when thrown up due to the influence of gravity. The gravitational force acts upon the body... View Article

## If you subtract 1/2 from a number and multiply the result by 1/2 , you get 1/8 .What is the number

Answer: Let us consider the number be x As per the given condition If we subtract 1/2 from a number and multiply the result by 1/2, then we... View Article

## Ice floats over water although it is solid .why

Usually, solids have a higher density than that of liquids. But Ice floats on water. Reson: Ice is generally regarded as a solid-state of... View Article

## Why do we yawn

We yawn usually when we feel sleepy. Our body gets tired and it tends to take rest or sleep. When we feel sleepy rate of respiration slows down.... View Article

## When we breathe oxygen in, we exhale CO2 within seconds. Is the CO2 we breathe out the by product of the respiration which happened with the oxygen we just breathed in.

Yes, the CO2 we breathe out the by-product of the respiration which happened with the oxygen we just breathed in. The end products are CO2 and... View Article

## Why does gases exert pressure?

The pressure exerted by a gas is due to the random motion of particles in the gas. Gases have weak intermolecular forces and the particles are in... View Article

## Why evaporation is a cooling process ?

In general terms evaporation is defined as the process in which the liquid state is convverted in to gas. This process requires heat energy.... View Article

## A car accelerates uniformly from 18km per hour to 36km per hour in 5 seconds . Calculate the acceleration and the distance covered by the car in that time.

Answer: Given parameters Time taken (t) = 5 sec Initial velocity (u) =18 km/hour     u = 5 m/s Final velocity (v) =36km/hour... View Article

## The relation between amplitude of electric and magnetic field at any place is given by

In electromagnetic waves the ratio of amplitudes of electric field and magnetic field is equal to the velocity of the electromagnetic waves in... View Article

## Hot air is lighter than cold air. Justify

Answer: The movement of air is mainly caused by the differences in pressure and temperature. Warm air is lighter and it rises upwards,... View Article

## Write a short note on microrganisms

Microorganisms are minute organisms that are invisible to the naked eye. Microorganisms are so small that they can only be seen under a... View Article

## 3/x-1+1/x-3=4/x-2. Find x.

Given equation 3/x-1+1/x-3=4/x-2 We need to find the value of x 3/x-1+1/x-3=4/x-2 On taking LCM in LHS we get 3(x-3) + 1 (x-1) / (x-1)(x-3)= 4/... View Article

## Prove that own and only one out of any three consecutive positive integers is divisible by 3.

Let the three consecutive positive integers be n,n+1,n+2 We know that n is of the form 3q,3q+1 or, 3q+2 Hence we can consider the following... View Article

## Explain the capture of food by amoeba

Endocytosis is a process by which amoeba engulfs its food. Amoeba has a flexible membrane and finger-like projections called pseudopodia.... View Article

## What mechanisms are involved in absorption of digested food and water?

The digested products absorbed by the blood and supplied to all parts of the body are called absorption. This process involves the following... View Article