CONTACT US cflogic.careerforum.in cf12plus.careerforum.in cfwings.careerforum.in
   CF Courses
   Post-A-Query
   Utilities
   CF Blogs
   Event Calender
   Share this page
 

   

ABOUT SSL CERTIFICATES
About Exam
Home

Quick tips for the 12+ Entrance Exams
Manish Pandey, Faculty (Physics)

We will be giving you some ‘Quick Tips’ on how to answer some of the questions which appear in the 12+ entrance exams. If you are aspiring to join a Medical and/or Engineering institution, the key to a good score is ‘timing as well accuracy’ in answering the paper.

In many instances your scores are not what you were expecting, as every year there is a change in paper pattern.

Hence to help you overcome this we are giving you some helpful tips and this round of ‘Quick tips’ we shall be dealing with problems in Physics.

The Physics paper has questions which are ‘conceptual’ as well as ‘numerical’. But in most entrances there are few questions on ‘conceptual’ (the figure approximation). There are more questions ‘numerical’ based questions, involving fundamentals as well as calculations. (Calculations are to be done without the help of calculators or Logarithmic tables).

This is where ‘Quick tips’ come handy!

Why are we stressing on solving numericals?

The reason is that, ultimately a crystal clear idea emerges about the concept.

Starting with examples of the question types.

Most questions contain two quantities at different conditions and you need to find the ratio of those two quantities.

The other alternative is you will be given one of the values and one which needs to be determined i.e. finding the value of the remaining part. (whatever has been discussed here is approximate figure the patterns may differ slightly)

Examples:

Q. A charge placed at the center of a cube of volume a3 causes an electric flux through the top square surface of the cube. If the charge is moved downwards through a distance a/2, what is the electric flux through the top surface?

Solution:
Here we have two same quantities at different condition here distance is decreased through half of the distance and we need to determine flux I the second part



Q. Electric field on the axis of a small electric dipole at a distance r is and . What will be the electric field at a distance of 2r on the equator of the dipole?

Solution:



Q. Energy stored in a parallel combination of two identical capacitors when charged with a d.c. source of 100 V, is 4 x 105 erg. Then the amount of energy stored in series combination of these capacitors when connected across 200 V, is

Solution:
CP = 2C and . Energy E = CV2. Ratio of energies = 1. Es = Ep
Copyright © Career Forum Ltd. All rights reserved
Career Forum
SNAPsprint MBAsprint MATsprint