Physics paper 1 doubts here !!

niassu · Mar 21, 2011

CaptainDanger · Mar 21, 2011

First Link
D
As we know when car is accelerating its kinetic energy increases and as it gains height the potential energy increases too...

Second Link
4- A
As there is no air resistance so speed or acceleration does not decrease... Only acceleration is constant...

11-A
Its clear the weight of the boy is more so he produces more power...

26-C ZY is in front of engineer... XY will reflect it upwards... PV will reflect it towards ZY... And WX area is lesser then XY... ( SORRY DON'T KNOW THE BETTER EXPLANATION HOPE YOU GET IT)

Third Link
2-D At positions P and Q ball is accelerating... The problem is at R I guess??? Well when it hits the ground due to the force it is accelerated upwards...

38- B At 0 counter reading is 140... At half life it should give 70... That is between 40 and 60 seconds...

Fourth Link
B
The pressure applied is the same so the height of mercury column is same... It does not depend on the cross sectional area...

Fifth Link
No idea... I am doing O level... Never learned that... :/ Gona try doing it myself....

Sixth Link
I know but I am unable to explain...

Seventh Link
21-B A should go in vertical direction as it leaves water... It hits surface of water at right angle so it must leave it at right angle without any deviation... C cannot be the answer too, light is going from denser medium to rare medium which means it needs to bend away from the normal... It is bending towards the normal at D...

30- B Potentiometer has the sliding contact... It cannot be seen in A and D while C has the wire joined with it so it disturbs the output you want to get...

Eighth Link
No idea...

Ninth Link
29-D In other options Voltmeter is connected in line... You need to connect it across the lamp or anything....

32-B It is used as potentiodivider having a slide contact to control the voltage...

Tenth Link
A Current will always try to go through the path which is easy for it... When that switched is closed... Very little amount passes through R which gives more to the lamp and makes it brighter.... As the resistance becomes less....

I hope it helps... If I am wrong anywhere do correct me... I am not good at explaining things...

niassu · Mar 21, 2011

CaptainDanger said:
First Link
D
As we know when car is accelerating its kinetic energy increases and as it gains height the potential energy increases too...

Second Link
4- A
As there is no air resistance so speed or acceleration does not decrease... Only acceleration is constant...

11-A
Its clear the weight of the boy is more so he produces more power...

26-C ZY is in front of engineer... XY will reflect it upwards... PV will reflect it towards ZY... And WX area is lesser then XY... ( SORRY DON'T KNOW THE BETTER EXPLANATION HOPE YOU GET IT)

Third Link
2-D At positions P and Q ball is accelerating... The problem is at R I guess??? Well when it hits the ground due to the force it is accelerated upwards...

38- B At 0 counter reading is 140... At half life it should give 70... That is between 40 and 60 seconds...

Fourth Link
B
The pressure applied is the same so the height of mercury column is same... It does not depend on the cross sectional area...

Fifth Link
No idea... I am doing O level... Never learned that... :/ Gona try doing it myself....

Sixth Link
I know but I am unable to explain...

Seventh Link
21-B A should go in vertical direction as it leaves water... It hits surface of water at right angle so it must leave it at right angle without any deviation... C cannot be the answer too, light is going from denser medium to rare medium which means it needs to bend away from the normal... It is bending towards the normal at D...

30- B Potentiometer has the sliding contact... It cannot be seen in A and D while C has the wire joined with it so it disturbs the output you want to get...

Eighth Link
No idea...

Ninth Link
29-D In other options Voltmeter is connected in line... You need to connect it across the lamp or anything....

32-B It is used as potentiodivider having a slide contact to control the voltage...

Tenth Link
A Current will always try to go through the path which is easy for it... When that switched is closed... Very little amount passes through R which gives more to the lamp and makes it brighter.... As the resistance becomes less....

I hope it helps... If I am wrong anywhere do correct me... I am not good at explaining things...

thnx very much for ur efforts
actually 38- B At 0 counter reading is 140... At half life it should give 70... That is between 40 and 60 seconds...

should be btw 60 and 140

niassu · Mar 21, 2011

plz guys if anyone also can help to i'll be waitng for ur replies soon thnx

niassu · Mar 22, 2011

htere some here who could help here ??? waa.....ting...?????

CaptainDanger · Mar 23, 2011

No the counter reading is between 40 and 60 seconds... I mean in between is 70... HALFLIFE...

CaptainDanger · Mar 23, 2011

AND NO PROBLEM!

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Physics paper 1 doubts here !!

niassu

CaptainDanger

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niassu

CaptainDanger

CaptainDanger

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