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#1
Sunday, December 27, 2009
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MCQ Of Physics Past Papers
Hey Guys ,
Please share ur plan about Mcq's prep. Which books are you guys using. and Shouldnt v start solving Mcq's ??? I have one mcq which is like nailing me hard . Its from 2009 P2 Q. With the passage of time the rate of decay of a radioactive element will a. Increase Exponentially b. Decrease Linearly c. Becomes Zeron in 2 half lives d. None of these I think its b but i am not sure what this linear thing is about >???? 
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#2
Monday, February 22, 2010
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solution of objectives
Assalamoalaykum dear. have u solved the objectives of previous papers? kindly share them with me.
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#3
Saturday, February 27, 2010
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Quote:
correct answer is D: reason: a is wrong, becoz decay rate decrease (not increases) b is wrong, becoz decay rate never decrealse linearly, if it decrease linearly it will become zero but it never b zeor(although tends to zero, but not equal to zero) C is wrong , becoz it never become zero d is right, becoz, decay rate decreases inverse exponentially, (initial state, it is 1, after one half life it will be half, after two half life it will be one-forth, after 2 half life it will be one-eighth, then one-sixteenth and so on. (never become zero)
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________________________________________________________________________________________________ My GoaL is to be a Failure! If I reach my GoaL, I'll be Successful and if I don't reach my GoaL, I'll still be Successful. ________________________________________________________________________________________________ Habibrahet
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#4
Friday, March 12, 2010
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Can Any1 Post The Answer To The MCQ's Of Past papers
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#6
Tuesday, July 13, 2010
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D is the correct answer
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#7
Tuesday, July 13, 2010
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another 1 from the 2009 paper A confuses me
Q. A body is moving northward and a force is applied in eastward , the acceleration produced is a) northward b) 45 degree east of north c) eastward d) none of these if it was moving very slowly towards north with the simplest approach from second law of newton it should be clear that accleration should be in direction of applied force hence option C should be correct . if it was moving very fast with increasing velocity towards north and force is very small then option A is correct option B can also be correct in a special case. hence this way it looks as if option D is best answer to be given at this moment.
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#8
Tuesday, July 13, 2010
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Option C is correct because the acceleration is always in the direction of applied force. your 1st reasoning is incorrect, even if it was moving with very high speed still the acceleration is eastward. 2nd argument is again wrong, if the body is moving with increasing velocity toward north this simply means that the force acting in two directions 1 northward 2- eastward, thus the acceleration would be somewhere b/w east and north. What is the special case for B in your mind the question is straight forward, these assumption are wrong..
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#9
Wednesday, July 21, 2010
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well it was the case B
but i got your point we have to consider zero acceleration in body before application of eastward force (ie body isn't under any force previously ) 1 more flaw in this objective is that they havent mentioned whether force should be applied like an impulse or it should be continuous like the gravitational pull of the earth . like electrons are moving in northward direction through an eastward directing electrical field path .  (these questions often come to my mind) but i agree with you option C is the correct answer if we dont make special cases and stick to the simplest second law of newton Last edited by Andrew Dufresne; Wednesday, July 21, 2010 at 09:56 PM.
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#10
Wednesday, July 21, 2010
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Even if it is impulse still the acceleration is in the direction of impulse, this isn't the flaw and your fig is proving my statement because you have applied the two forces the result will be two accelerations and we pick the resultant.
i suggest you to study some good foreign author books.
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