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All the competitive exams today are objective type, i.e. MCQ type. They have 4 options out of which 1 or more are correct. There are some differences between a subjective and an objective test –
|Objective test||Subjective test|
|Only the final answer matters, not the method or number of words, etc||Proper logical flow is required in answer|
|OMR should be filled incorrectly||Handwriting and paper should be neat|
|Steps do not matter, students should reach the final answer in minimum time||The answer should step by step, each step carries marks|
|The negative marking may or may not be present||No negative marking|
Due to these, the test taking strategy for these tests also differ. Students in an objective exam need to be quick and reach the final answer as fast as possible. Now even after you are fully prepared and have practised enough, there are some tips that will help you reach the answer quickly, and maximise your score.
(b) (incorrect units)
(d) (correct units)
Now first calculate dimension of each option, you get
= [M]/  [L] = [T]. CORRECT ANSWER!! 🙂
The sum of n natural numbers (1+2+3+….+n) is:
(a) n (n-1)/2
(b) n (n+1)/2
(c) n (n+2)/3
(d) (n+1) (n-1)
Now if you have studied this and know the answer, well enough. If not, one may sit and start solving it or start proving it. But that will mean losing crucial exam time. Rather, some formulae can be proved or disproved by simple calculations. In this case –
Sum of first two natural numbers should be 3.
Put 2 as the value of n.
Solving (a) you get 1
Solving (b) equation, we get 3 as the answer while (c) equation dissolves into 8/3, which is not a natural number.
Solving (d) gives 3.
Now consider sum of first 3 natural numbers, so take n=3
(b) gives 6
(d) gives 8
So (b) is correct.
Some more tips –
So best strategy is – attempt the easier questions first to get full marks atleast in those questions. Then come to medium level questions, and leave difficult questions for the last.
However, note that if there is no negative marking for wrong answers in your paper, then choose the closest correct option that you feel is right.
But just like always we would urge you to first focus on your preparation, as there is no substitute to good preparation and practice.