Biology; Chemistry; Physics: Post your doubts here!

[exploded diper]

To post the link, just press and hold the link, it will become highlighted. There will be 2 draggers on each side to extend the copied text, and then just click on copy

Why is everyones avatar like this.....

 

[asadalam]

Can someone plz explain these mcqs to me????
Awesome12 Dark Destination funky brat asadalam

1.Draw a parallelogram to find the resultant.Ans is B it think.
2.Ans is A?Cuz if you reverse connections with diode going to the positive,it'll rectify the current if attached with negative and wont allow current to flow
3.Ans is A?
4.Ans is C?

 

[exploded diper]

What thinks....

1.Draw a parallelogram to find the resultant.Ans is B it think.
2.Ans is A?Cuz if you reverse connections with diode going to the positive,it'll rectify the current if attached with negative and wont allow current to flow
3.Ans is A?
4.Ans is C?

 

[asadalam]

What thinks....

Me

 

[exploded diper]

So u r an it....bet u r tht cat....

Me

 

[Fate0]

(c) part please.

 

[Dream.Eater]

1.Draw a parallelogram to find the resultant.Ans is B it think.
2.Ans is A?Cuz if you reverse connections with diode going to the positive,it'll rectify the current if attached with negative and wont allow current to flow
3.Ans is A?
4.Ans is C?

The first two are correct and thanks a lot, I understood it.
3 is D not A and 4 is(surprisingly) A. Even I thought it was c

 

[asadalam]

The first two are correct and thanks a lot, I understood it.
3 is D not A and 4 is(surprisingly) A. Even I thought it was c

Oops yeah i didnt see in 4 correctly,that would be A.Draw a clockwise rotation and they both would have same direction of current that would cause the compass to be so.
And i dont get 3 though i suppose it would be about the bulbs being in parallel.

 

[Awesome12]

Can someone plz explain these mcqs to me????
Awesome12 Dark Destination funky brat asadalam

Since the first 2 have been explained, I will explain the last 2

3) If the given circuit, a bulb requires 1 A to glow
We know that in parallel the current divides, and we will need 2 A for both the bulbs to glow.
What did you choose? I can explain what you did wrong

4) Look at the compasses on the side. Use the right hand grip rule (for current). The fingers will be the direction of the magnetic field at which the compass will align itself. You will observe that X and Y both carry current in the same direction (magnetic field lines produced are the same). Now the compass in the middle is also pointing upwards which is the same as X. This means that X has a stronger magnetic field and hence the current flow is greater

 

[Dream.Eater]

Since the first 2 have been explained, I will explain the last 2

3) If the given circuit, a bulb requires 1 A to glow
We know that in parallel the current divides, and we will need 2 A for both the bulbs to glow.
What did you choose? I can explain what you did wrong

4) Look at the compasses on the side. Use the right hand grip rule (for current). The fingers will be the direction of the magnetic field at which the compass will align itself. You will observe that X and Y both carry current in the same direction (magnetic field lines produced are the same). Now the compass in the middle is also pointing upwards which is the same as X. This means that X has a stronger magnetic field and hence the current flow is greater

I chose C for 3 while asadalam chose A

Thanks a lot bro!!! I understood 3 &4.

 

[FLRNAB]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_s12_qp_22.pdf
Question 3 Part B (II)

 

[Awesome12]

I chose C for 3 while asadalam chose A

Thanks a lot bro!!! I understood 3 &4.

In C, the current will remain the same as they are in series

 

[asadalam]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_s12_qp_22.pdf
Question 3 Part B (II)

300 x 60 x 60 = 1080000 J
Since 300 watts are used per second then we simply multiply

 

[Awesome12]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_s12_qp_22.pdf
Question 3 Part B (II)

The power is 300W
Time is 1 hour = 3600 s

Energy = 300*3600
= 1.08 * 10^6

 

[asadalam]

So u r an it....bet u r tht cat....

 

[Dream.Eater]

Did u make this meme????

 

[Mahnoorfatima]

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_w13_qp_12.pdf
Question 7 and 29 anyone?

 

[asadalam]

Did u make this meme????

Internet par mila bhai

http://papers.xtremepapers.com/CIE/Cambridge International O Level/Physics (5054)/5054_w13_qp_12.pdf
Question 7 and 29 anyone?

7 is C since if we move weight closer,there will be less distance from pivot and less torque so other end will move down to less torque on one end.
29 is B cuz we close s1 n s2 to get a combined resistance of 1.5 and open s3 to make current flow through 4.5 ohm resister that will give a total resistance of 6.

 

[FLRNAB]

300 x 60 x 60 = 1080000 J
Since 300 watts are used per second then we simply multiply

The power is 300W
Time is 1 hour = 3600 s

Energy = 300*3600
= 1.08 * 10^6

I got the same answer but MS said "1.08 × 106J; 1.1 × 106J" and I didn't think it was raised to power 6

 

[FLRNAB]

To how many SF do we have to give our answers?