Chemistry and Physics AS paper 12 MCQS

Mairaxo

Mairaxo

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KWIKIW said:
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s03_qp_1.pdf

Do you know how to do Qs 33 , 32, 20, 16, 11 in 01/M/J/2003?
Click to expand...
Q11- its B. this is because 1stly the road has an upward force on the wheels which is the opposite of the weight of the car. so its either a or b. then the 2nd force is applied so the car can move. so the force is applied to the right which causes the car motion to the right so it is B.
Q16- power is work done per unit time. B is also used to calculate power but C is the proper definition.
Q20- P=hdg so h=p/dg
pressure will be 10% of Po so 10Po/100 = Po/10
substituting u get Po/10dg :)
Q32- V=7.5 so 7.5/15=0.5A
Q33- 1st add the ones in series. 16kohm up and 16kohm down. then use the formula R1R2/R1+R2 = 16*16/16+16 = 8kohm :)
 
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KWIKIW

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Mairaxo said:
Q11- its B. this is because 1stly the road has an upward force on the wheels which is the opposite of the weight of the car. so its either a or b. then the 2nd force is applied so the car can move. so the force is applied to the right which causes the car motion to the right so it is B.
Q16- power is work done per unit time. B is also used to calculate power but C is the proper definition.
Q20- P=hdg so h=p/dg
pressure will be 10% of Po so 10Po/100 = Po/10
substituting u get Po/10dg :)
Q32- V=7.5 so 7.5/15=0.5A
Q33- 1st add the ones in series. 16kohm up and 16kohm down. then use the formula R1R2/R1+R2 = 16*16/16+16 = 8kohm :)
Click to expand...


Thanks.
But I have those doubts in chemistry May/June 2003 paper .
Sorry about not mentioning the subject in my post.
 
cute angel

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thank uuuuu ssssoooooooooo much frankuzi!!!!! may u get all A's in ur result!!! i had some doubts n u cleared em well!! thnkx once again.......
 
Mairaxo

Mairaxo

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cute angel said:
Can any body please solve these qs for me frm this ppr.........
Q 24 n 36
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w12_qp_13.pdf
Click to expand...
Q24- X is not a hydrocarbon as hydrocarbons dont react with PCl5. X can either be acid or alcohol but we cant still distinguish which one it is. X is not an aldehyde for sure as X does not react with 2,4-dinitrophenylhydraxine. So we cant be sure whether its an alcohol or acid but we can say that it certainly is not an aldehyde :)
Q36- 1 is correct as H-Cl forms stronger bonds than H-Br so the enthalpy change of HCl will be higher. 2 is also correct because H-Br is more stable than H-I so the forward reaction will be faster in HBr so as more products form it has a higher Kp value. 3 is wrong because I is below Cl in the group so its valence electron is farther away from the nucleus so it is held more weakly and needs less energy to be removed. Hence ionisation energy of Cl is higher so 3 is wrong :)
 
Mairaxo

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mariamh said:
Physics
2009
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w09_qp_11.pdf

Q 14, 16, 21 ,
Click to expand...
Q14- A because max height means it covered half the distance so the energy also gets halved.
Q16- C. first find input power. output/input *100=efficiency. so 400000000/80=5MW
then find I using P=IV, 5MW/25kV=200A
Q21- find the area under the graph. Make it a triangle 1st. A=0.5*100*(2*10^-3)=0.1J but the area is not exactly a triangle. It is slightly more than a triangle so we assume it to be 0.11J
 
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