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Physics, Chemistry and Biology: Post your doubts here!

Iridescent

Iridescent

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Gehad Mohamed said:
Hello, Can anyone explain why in Q 26 c is the ans in http://www.freeexampapers.com/index.php/directory/download?location=IGCSE/Physics/CIE/1998 Nov/0625_w98_qp_01.pdf
Click to expand...

Each lamp provides some resistance. When they are connected in parallel, the total resistance is half the resistance of one of the lamp. When N is removed, the resistance increases because now the complete resistance of M is there. When the voltage is constant, resistance and current are inversely proportional. Therefore, when the resistance increases, the current decreases. So, the current will be less than 2A.
Hope you understood.
 
O

Othman

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omaaaar said:
http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Physics (0625)/0625_s09_qp_1.pdf
Q4
Q5
Q8
Q18
Q34
Q38
Click to expand...

q4) Not A, because the balance can measure mass.
Not C, not you can have a paper which is larger than a piece of iron, but iron has a larger volume.
Not D, weight is force mass is not.
So it is B.

q5) You need to find the weight for the 10kg on that planet. So it is 5*2 = 10, 18*5 = 90. Which is Venus. D

q8) The plank is in equilibrium, so the upward force must equal the downward force. So P+R=Q which is B.

q18) C, density of air is less because when you heat air particles gain more energy they increase in the distance between them. Thus the volume increases. D= M/V, if V increases then D decreases.

q34) C, neutron is not charged so it is not attracted or repelled by the electric field.

q38) Look at the graph it was 2200 then after two days it became 1100, so the half life is two days. Which is C

LOL, I've been solving V2 :$ now I'll explain V1.
 
Gehad Mohamed

Gehad Mohamed

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Iridescent said:
Each lamp provides some resistance. When they are connected in parallel, the total resistance is half the resistance of one of the lamp. When N is removed, the resistance increases because now the complete resistance of M is there. When the voltage is constant, resistance and current are inversely proportional. Therefore, when the resistance increases, the current decreases. So, the current will be less than 2A.
Hope you understood.
Click to expand...
Thanks alot :)
 
omaaaar

omaaaar

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Othman said:
q4) Not A, because the balance can measure mass.
Not C, not you can have a paper which is larger than a piece of iron, but iron has a larger volume.
Not D, weight is force mass is not.
So it is B.

q5) You need to find the weight for the 10kg on that planet. So it is 5*2 = 10, 18*5 = 90. Which is Venus. D

q8) The plank is in equilibrium, so the upward force must equal the downward force. So P+R=Q which is B.

q18) C, density of air is less because when you heat air particles gain more energy they increase in the distance between them. Thus the volume increases. D= M/V, if V increases then D decreases.

q34) C, neutron is not charged so it is not attracted or repelled by the electric field.

q38) Look at the graph it was 2200 then after two days it became 1100, so the half life is two days. Which is C

LOL, I've been solving V2 :$ now I'll explain V1.
Click to expand...

I didnot understand Q5
 
omaaaar

omaaaar

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Othman said:
So only 34 and 38.

q34) Right hand grip rule, the current is anticlockwise. So the compass facing that direction is C only.

q38) B, the alpha is helium nucleus. So 2 neutrons are lost. which Is 138-2=136.
Click to expand...

Q 34 could you elaborate
 
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