Shortcut methods in aptitude solving-1

Time and Distance problems

1. Average Speed=Total distance/Total time

• When they are more than one average speed then in order to find the average speeds of all here are some conditions

1. When time is constant Average speed is Average of all speeds.
2. When distance is constant then average speed is Harmonic mean of all average speeds.

For e.g: Two speeds s₁,s₂ Average speed=2/((1/s1)+(1/s2))

Train Problems:

A train of length ‘l’ speed ‘s’ crossing a pole(man) of negligible length then time taken by train to train is

T=l/s

2    A train of length ‘l’ and speed ‘s’ crossing a platform of length ‘l_p’, then time taken by train to cross platform is
                                                                  T=(l+lp)/s

Relative speed Problems:

            In solving Relative speed problems there arises two cases

Case 1: When two objects of speeds s1, s2 are moving in the same direction then relative speed is difference of their speeds (i.e., s1~s2)

Case 2: When two objects of speeds s1, s2 are moving in the opposite direction then relative speed is sum of their speeds (i.e., s1+s2) 

To remember more things constant repetition is a way. The mind only remembers a quarter of what you hear.

Cracking word analogy questions

Many competitive exams have these type of analogy questions. In these type of questions we are going to find the relationship between words

These questions can be easily identified easily by....words separated with (:) and (::). The symbol (:) is read as "is to" and (::) means "as"..

Here let us see an example professor:university:: Doctor:hospital

There are several types of analogy questions u can easily solve by practice....

 Every 11years, the sun reverses its overall magnetic polarity. Its north magnetic pole becomes the south pole and vice-versa.

Beware of your CELLPHONE

                     Recently I have made research on cellphone and how the radiation levels are going to affect our brain and on health.

First let us know about the radiation of cellphone and how it is going to measured.......

                The radiation levels of cellphone can be measured by a rate called Specific Absorption Rate (SAR), which means the rate at which the RF radiation is absorbed by human body. This SAR value is measured in terms of Watts/Kilogram(W/Kg).

                If SAR value of your mobile phone is more than 0.5W/Kg, then your brain and nerves are affected soon by radiation of your cellphone.To know the SAR value of your phone click on the below link

http://www.sarshield.com/english/radiationchart.htm or Google it by "SAR value of Yourphonemodel"

                     Finally I suggest you that, If you are talking more, then use phone model with SAR less than 0.5W/Kg or take measures like using headset........