Biology; Chemistry; Physics: Post your doubts here!

[Kamihus]

but wont hot water denature the enzymes in the microbes? i still dont get q40. what two distinct groups of offsprings? how do a heterozygous and a homozygous recessive produce two clearcut offsprings? their ratio will be 1:1 so theyre either tall or short...is that it?

hot water may not be that hot and C is absolutely correct
in 40 the height increases then decreases then increases so those are the two distinct groups
read the graph u dont have to deduce yourself as they're no mention of heterozygous or homozygous

 

[Snowysangel]

hot water may not be that hot and C is absolutely correct
in 40 the height increases then decreases then increases so those are the two distinct groups
read the graph u dont have to deduce yourself as they're no mention of heterozygous or homozygous

tall and short are the two distinct groups? plus its a bar chart so it has to be discontinuous variation right? does hieight always have both discontinious and continuous variation? under what circumstances is there only one type of v?

 

[Kamihus]

tall and short are the two distinct groups? plus its a bar chart so it has to be discontinuous variation right? does hieight always have both discontinious and continuous variation? under what circumstances is there only one type of v?

bar chart is not always discontinuous. there is variation even in the groups short and tall
depends on height its not always continuous.what is v?

 

[ZaqZainab]

Ohms Law:
"the current flowing in a metallic conductor is directly proportional to the potential difference applied across its end, provided that the physical conditions (such as temperature) are constant "...hence V proportional to I .....and V = IR...where R is a constant (resistance of the conductor)

Thanks

the image formed by the lens in camera is: i) real ii) inverted iii) diminished
Ans: B

My doubt might seem a little idiotic but when i look at an image in my camera it is not inverted

 

[kiara15]

Is this A Level or O Leve?

a level

 

[thementor]

So now.... the answer to the phy MCQ as to what happens to the voltmeter and ammeter readings if the filament in lamp 1 broke..... is that..... Ammeter reading decreases and voltmeter reading increases.... those of you who did it wrong...... Join the club!!

the answer was ammeter increases voltmeter decreases....

 

[thementor]

Yup i did it but probably its wrong

the answer is ammeter increeses and voltmeter decreases.

 

[thementor]

Literally everyone did that!!

that is the real answer.

 

[Saad Mughal]

the answer is ammeter increeses and voltmeter decreases.

Hope so.

 

[thementor]

Hope so.

I know...but still it's common sense

 

[Saad Mughal]

I know...but still it's common sense

That's what I thought but you know how tension gets the better of a person.

 

[thementor]

That's what I thought but you know how tension gets the better of a person.

Yeah.....let's just pray for the best...and good luck for Bio tomorrow

 

[usama321]

I so wanted to believe that it was current increases and voltage decreases.
Thing is when the filament breaks, the current takes the path of the voltmeter. From what i have read online, they are saying voltmeters have EXTREMELY high resistance. So, the ammeter reading is bound to decrease if that is correct The other logic that current decreases because it can't flow is perhaps wrong. but it worked for them

 

[Saad Mughal]

Yeah.....let's just pray for the best...and good luck for Bio tomorrow

I don't have Bio.

 

[Zuhsid]

I so wanted to believe that it was current increases and voltage decreases.
Thing is when the filament breaks, the current takes the path of the voltmeter. From what i have read online, they are saying voltmeters have EXTREMELY high resistance. So, the ammeter reading is bound to decrease if that is correct The other logic that current decreases because it can't flow is perhaps wrong. but it worked for them

Exactly...... but the voltage increases.... also search it online, coz it is directly to the battery now, so it has a higher potenial difference across it now!!

 

[usama321]

Exactly...... but the voltage increases.... also search it online, coz it is directly to the battery now, so it has a higher potenial difference across it now!!

voltmeter almost completely blocks the current. You have to remember that voltage is also dependent on current. When there is such a low current, the voltage would decrease too. Still, i am not sure

 

[Zuhsid]

voltmeter almost completely blocks the current. You have to remember that voltage is also dependent on current. When there is such a low current, the voltage would decrease too. Still, i am not sure

Your concept is not clear.... i actually had to learn it from an electrical engineer to get it too
What "potential difference" means is that in the two wires connected an appliance(neutral and live), there should be a difference in voltage....... and as one side was connected directly to the power supply, that wore was at higher potential and the other at 0V(since, like u said current would not pass)....... so it basically gets the maximum p.d!!

 

[usama321]

Your concept is not clear.... i actually had to learn it from an electrical engineer to get it too
What "potential difference" means is that in the two wires connected an appliance(neutral and live), there should be a difference in voltage....... and as one side was connected directly to the power supply, that wore was at higher potential and the other at 0V(since, like u said current would not pass)....... so it basically gets the maximum p.d!!

hmmmmmmmmmm, I am still not clear. Still, let's hope it is decrease both, at least you guys will get the mark

 

[Zuhsid]

hmmmmmmmmmm, I am still not clear. Still, let's hope it is decrease both, at least you guys will get the mark

Yeaaaa.... about that..... i did it wrong too!!
The above research was done AFTER the paper! lol

 

[usama321]

Yeaaaa.... about that..... i did it wrong too!!
The above research was done AFTER the paper! lol