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AS (Biology) P1 MCQs Preparation Thread.
Yup, 100%. What'd your teacher tell you that's different? -
AS (Biology) P1 MCQs Preparation Thread.
Sure, no problem. I've done this one before: 42 EPGU - 10 SMU 1 EPGU - x SMU 42x - 10 x - 10/42 = 0.238 SMU 1 SMU - 0.01 mm 0.238 SMU - x mm x - 0.01 x 0.238 = 0.00238 mm Therefore, step 1: 10 divided by 42 = 0.238 x 0.01 = 0.00238 mm. Step 2: 0.00238 multiplied by 1000 = 2.38 micrometres. -
A level Biology: Post your doubts here!
24. B, because water enters by osmosis. Osmosis is a passive process, requiring no energy. 31. All you have to do is read the graph. 13. Phosphorous chloride and oxide are both acidic. 15. The electrolyte contains Na+ Cl- H+ & OH-. H2 is given off; for that, two molecule of H2O are need. Cl2... -
AS Physics P1 MCQs Preparation Thread.
13. You can make a closed triangle of sides 3 cm, 4 cm and 5 cm. Forces in equilibrium can be represented by a closed triangle. 27. WD=qV=the same for both. 13. The acceleration of the box = the acceleration of the 2 kg mass. You must consider them to be one thing. Act like the whole system is... -
Revision for bio paper 1
It's C because the % of DNA left after five generations is 1/32%. That's 3.125. Or you can do measurements to check: -
Chemistry and Physics AS paper 12 MCQS
12. Horizontal, frictionless surface - constant p. Therefore B & C can be ruled out. Rebounds along its original path - the final p has to be negative. 20. We know that GPE increases when an object's height increases, on the Earth's surface. The Earth's gravitational field lines are downwards... -
AS (Biology) P1 MCQs Preparation Thread.
They're asking for the % of cells containing 15N after 5 generations. After 1 generation it's 1/2%, after 2 generations it's 1/4%, after 3 generations it's 1/8%, after 4 generations it's 1/16% and after 5 generations it's 1/32%. -
As physics p1 MCQS YEARLY ONLY.
The power of a battery is got by using P=IV only. -
AS (Biology) P1 MCQs Preparation Thread.
It was grown for five generations. -
AS Physics P1 MCQs Preparation Thread.
No, that's not what I mean. I was just giving those numbers as an example. What I meant to say is that the galvanometer showed zero deflection when the voltage across XY was, FOR INSTANCE, 6 V, and when the EMF was 12 and the variable resistor was 6 V. Then the variable resistor got 8 V across... -
AS Physics P1 MCQs Preparation Thread.
The V across XY decreases when the R of the variable resistor increases. So, for XY to take more V, it should increases it's R, and to increase its R, it should increase its length. If the contact moves closer to X, the voltage will decrease even more. You need to get back the old V to get zero... -
As physics p1 MCQS YEARLY ONLY.
A is wrong because the GPE does not increase. B is correct; it loses GPE and gain EPE because the pressure increases with depth; WD on a fluid = pressure x delta volume = EPE. C is incorrect; it loses GPE but does not gain KE because the question states that the rate of flow is constant. D is... -
As physics p1 MCQS YEARLY ONLY.
31. Electric fields are uniform between two parallel plates. 30. E=V/d. D is irrelevant. C: if the resistance of the resistor is increased, it'll take more voltage for itself. That'll decrease the voltage across the plates, and therefore the E. B: an increase in the PD will lead to an increase... -
Chemistry and Physics AS paper 12 MCQS
You'll find this video helpful, hopefully: . -
As physics p1 MCQS YEARLY ONLY.
11. Mass is conserved; it always is. The initial and final speeds are the same, so the speed too is conserved. If the mass and speed are the same, then the k.e. too is the same. That leaves momentum. 15. 21. Efficiency = Power output/Power input. Power output=200 x 6000. Power input=500 x 9.81... -
AS Physics P1 MCQs Preparation Thread.
You have to keep in mind that the points on a wave don't travel to the right, they only move up and down. A trough is travelling towards the point P, so P will go downwards. Point Q will be at the same position as point P when point P becomes a trough. Point P in the diagram has 0 displacement... -
AS Physics P1 MCQs Preparation Thread.
You need to know that the potentiometer circuit shown in the question is the same as a circuit of 2 resistors in series. One resistor is the variable resistor & the other resistor is the wire of length XN. If the resistance of the variable resistor increases, it will take more voltage and the XN... -
AS Physics P1 MCQs Preparation Thread.
30. Charge = current x time. Average current = (100+20)/2 x 8. 34. The maximum voltage across the variable resistor = 50/60 x 9. The least is 10/60 x 9. -
AS Physics P1 MCQs Preparation Thread.
35. The voltage across R1 = 5-3=2 V, across R2 = 3-2=1 V, and R3 = 2 V. You can find the resistance of the resistor using the formula for potential dividers in series. For instance, the resistance in R1 can be found using the formula R1/(R1+R2+R3) x 5 = 2. 22. k=F/e. F for one spring is W/3, so... -
AS Physics P1 MCQs Preparation Thread.
Ah, sorry, I made a mistake. It's actually rho/l = rho/V^(1/3) (because l = V^(1/3). Your method is correct as well. Like so: