-
We need your support!
We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
Click here to Donate Now (View Announcement)
Search results
-
AS Physics P1 MCQs Preparation Thread.
What we're supposed to do in this question is draw tangents to A, B, C & D FROM THE ORIGIN (don't ask why; pretty stupid question, in my opinion) and see which tangent has the largest gradient, i.e. is the steepest. Because 1/R=I/V, so if 1/R is big, R will be small. -
Physics: Post your doubts here!
ahmed abdulla I is proportional to (A^2)(f^2). For wave Q, the frequency is halved, so the intensity is divided by four. Then its amplitude is doubled, so the intensity is quadrupled. 4 and 4 cancel out. -
P1 MCQ's preparation thread for chemistry ONLY!!!!
2. Number of electrons = 10 (it's a negative ion) which also = the number of neutrons. 10. In symmetrical molecules, dipoles cancel out. 33. 1 is true because H2SO4 will dissociate lots since it's a strong acid. For 2, you'll have to check and see where the SO42- ion comes from. It comes from... -
Chemistry: Post your doubts here!
No, that's a -CO2C-, not -CO2H. It's an ester bond. For 6, all you gotta do is put the numbers they've given you into the formula. Also, one thing: V is found using mass/density. -
Physics: Post your doubts here!
You have to understand projectile motion to understand 14. The vertical component of the velocity at the highest point during a parabolic trajectory will be 0, and its horizontal component will stay the same throughout. In 19, all you have to do is put in numbers into the formulas I've given... -
Physics: Post your doubts here!
The reading on the voltmeter decreases because more voltage goes to the variable resistor. The reading on the ammeter isn't changed because the resistance of the resistor it is connected in series with is the same. -
P1 MCQ's preparation thread for chemistry ONLY!!!!
3. The RATE of the reaction is what's being talked of. The RATE will increase with a rise in temperature. 9. Write down the initial moles, then the change in moles, then the equilibrium moles, then add the equilibrium moles. 27. The C-I bond breaks fastest because it's the weakest. 36. 1 is... -
Chemistry and Physics AS paper 12 MCQS
7. In the case of B: Initial moles of P, Q & R = 2, 0, 0 Change in moles of each = -x, +2x, +x Final moles of each = 2-x, 2x, x Divide all the final moles by 2 and the sum of them will = (2 +x/2). Do the same for all of them. The sum of the final moles won't equal (2+x/2). 24. All the compounds... -
As physics p1 MCQS YEARLY ONLY.
There isn't any. Perhaps the examiners thought the equation for Al has 3/2 O2... -
Chemistry and Physics AS paper 12 MCQS
11. A because n is the number of bonds. In B n is the number of bonds too but not all the bonds are broken. In C n is the number of bonds but they're formed and not from separate atoms. In D n is the number of moles. 15. 2-1.32 grams of MO (metal oxide) were formed. Mole ratio of metal... -
A level Biology: Post your doubts here!
37. Macrophages cut up pieces of antigens after phagocytosis and display them on their cell surface membranes for T-cells to detect. 38. Yes, if they belong to different food webs then they can be at different trophic levels, but they can also have different foods to eat, so they won't compete... -
-
Physics: Post your doubts here!
11. Pressure increases with depth (p=density x g x height). So does Force, because F=pA and A is constant. 18. Pressure=density x g x height. The height is the difference in height between the two tubes. The difference in height is 2h, because the liquid in the right hand tube moves h metres up... -
Chemistry: Post your doubts here!
6. Use pV=nRT. 8. Volume is proportional to temperature at constant pressure. You can tell from pV=nRT. 27. Unreactive towards mild oxidising agents = tertiary alcohol. We can get only D from a tertiary alcohol. 29. B and C are not acidic; A is not chiral. That leaves D. 30. The acid used to... -
Need Help With Physics Paper 1 Questions
20. The average K.E. gets reduced because the molecules with the highest K.E. leave. So the average becomes less. 21. You'll have to use pressure=rho x g x h. Like this: 17.5 x (10^6) = (830 x 9.81 x h) + (1000 x 9.81 x 2000-h). -
Chemistry: Post your doubts here!
That's why D is not the correct answer. -
Chemistry: Post your doubts here!
D is: CH2CH2CO2(CH2)4CH3. C is: CH3(CH2)4CO2CH2CH3 The underlined parts are from the carboxylic acids. D's is propanoic acid and C's is hexanoic acid. In the question, we start of with hexanol, with is then oxidised to hexanal, and then to hexanoic acid. -
As physics p1 MCQS YEARLY ONLY.
Well if 0.5:0.75:1 can't be simplified into whole numbers, then there must be something wrong with the question. -
A level Biology: Post your doubts here!
15. Intracellular means within the cell, intercellular means from cell to cell. The membranes inside allow intracellular and the membranes outside allow intercellular. 19. Replication of DNA is the formation of chromosomes. Chromosomes are formed during interphase; they only become visible in... -
A level Biology: Post your doubts here!
There are differences too.