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a) Yes. for example in cloning Dolly the sheep, the surrogate is also a sheep. It does not have to be the same type of sheep though. b) It seems too long. You can say the seedlings are grown in the hormone rich medium from the beginning as this stimulates root/shoot development. Also i thought...

Lol, im not sure if my first two answers are correct (kinda guessing them) a) for both animals the enzymatic activity increases from 0degrees to a certain point (when the enzyme is most efficient) then decreases with further increases in temperature. The enzyme activity is generally greater for...

Lungs: oxygen concentration increases and diffuses into bloodstream during inhalation, carbon dioxide concentration decreases as it CO2 diffuses from blood into lung alveoli for exhalation Small intestine: carbon dioxide increases as it is a waste product of cell metabolism, concentration of...

The formation of gametes occurs by meiosis. In diploid cells, single stranded homologous chromosomes duplicate to form double stranded homologous chromosomes which pair up. Crossing over occurs along random segments, forming recombinant chromosomes. The double stranded homologous chromosomes are...

An arterial blood gas analyser is an invasive medical procedure in which a probe collects a blood sample from which gaseous and electrolytic composition can be determined. Carbon dioxide saturation of blood can be determined using electrodes in the analyser which convert the chemical signal into...

i wrote piezoelectric transducer, computer and i also said the gel as a back up

I assume that you may lose 2 or 3marks since the question said "changing electrical properties of materialS" so you had to talk about two materials. For superconductors would you say something like; superconductors below their critical temperature will have zero resistance as electrons form...

i said initially the space station is a weightless environment since the only acting force is gravity (ie. no normal reaction force). When it rotates, the astronaut experiences centripetal force towards the centre of the space station as he is accelerating. This provides a reaction force, which...

^ u should state the criteria that you're justification is based on; i.e. type/nature of radiation emitted and half life The type of radiation should be gamma rays or PET and half life should be short enough to prevent excess exposure to radiation therefore only fluorine18 and technetium 99m are...

basically i wrote: a photocell consists of an anode and a photosensitive cathode in a highly evacuated glass tube. When light of a frequency higher than the cathode's threshold frequency strikes the cathode it emits free electrons by the photoelectric effect. The electrons are accelerated as a...

i think i got 0.175m/s/s which is near your value.

It was three marks. And it is a sin wave. I meant i didnt use a ruler to draw the axes. It was free hand. The curve looked decent though.

no part b asked for magnitude and direction of electric field. if u wanna check fizzy cist posted the paper

i got 1.19AU???

^yeh. i showed that the emf doubled in the second second. and the frequency was double as well

for the question where you had to draw the emf versus time, i drew the wrong graph at first. But then i crossed it out and drew a new graph with all the correct features. However i didnt use a ruler (i only realised 20seconds before end of exam), would this cost me a mark?

i wrote V=Ed = 0.01 x 15 = 0.15 V b)magnetic field deflects electron down. so electric field must deflect it up. so direction of field is down. Equate forces caused by electric and magnetic field; Eq=qvB E = 10^4 x 0.5 = 5000 N/C downwards

since the mass moves at constant felocity net force is O. this means the upward force produced by the motor's rotation should equal the downward weight force of the mass. so use f=mg

Thanks! Could you please post up your solutions to MCQ?

P and Q are the copper rings, not the names of the magnetic fields. theres more flux threading the plane of Q, however theres more flux per area threading P hence D