Biology; Chemistry; Physics: Post your doubts here!

[syed1995]

I have my physics paper day after tomorrow so I would be glad if someone can these problems

DAY AFTER TOMORROW ?!??!?!?!?!

 

[asd]

I have my physics paper day after tomorrow so I would be glad if someone can these problems

1. Describe simple experiments to show refraction of sound waves.
2. Describe the factors which influence the quality (timbre) of sound waves and how these factors may be demonstrated.
3. Use of ultra sound in quality control.
4. Discuss the environmental and cost implications of underground power transmission compared to overhead lines.
5. State the meaning of the terms processor, output device and feedback.
6. Describe the use of a bistable circuit.
7. Describe the use of a astable circuit. Describe how the frequency of an astable circuit is related to the values of the resistive and capacitive components.
8. Describe with the aid of a block diagram one type of fission reactor for the use in a power station.

All these topics are listed in the syllabus.
Waiting for someone to reply.

Thankyou

Dude that's IGCSE?

 

[syed1995]

Which option is it and why? The drawing is so jumbled up .. I can't understand it -,-

 

[ayeshaK]

Which option is it and why? The drawing is so jumbled up .. I can't understand it -,-

5

 

[Dukeofwin]

Which option is it and why? The drawing is so jumbled up .. I can't understand it -,-

My teacher said all options are possible but the actual answer of what i remember is (A)
because its the closest.
Please correct my teacher if he's wrong!

 

[syed1995]

A Repeat Question almost every 2-3 years .. I know the answer but what's the logic behind it?

 

[bogus]

Dude that's IGCSE?

its on r syllabus in case u dont know the revision checklist

 

[ayeshaK]

My teacher said all options are possible but the actual answer of what i remember is (A)
because its the closest.
Please correct my teacher if he's wrong!

No its 5 because all are nt connected from end points!!!

 

[bogus]

A Repeat Question almost every 2-3 years .. I know the answer but what's the logic behind it?

b?

 

[ayeshaK]

A Repeat Question almost every 2-3 years .. I know the answer but what's the logic behind it?

B is the answer !!

 

[a.abid]

A Repeat Question almost every 2-3 years .. I know the answer but what's the logic behind it?

The Answer is B

 

[ayeshaK]

its on r syllabus in case u dont know the revision checklist

O level physics is tmwrw !!!!

 

[bogus]

B is the answer !!

go on website elephantfurry physics and view animation...thats how i got it syed1995

 

[a.abid]

My teacher said all options are possible but the actual answer of what i remember is (A)
because its the closest.
Please correct my teacher if he's wrong!

The answer is C-that is 5

 

[bogus]

O level physics is tmwrw !!!!

ya i know

 

[syed1995]

My teacher said all options are possible but the actual answer of what i remember is (A)
because its the closest.
Please correct my teacher if he's wrong!

The Answer is 5 so C. not A. As it completes the whole circuit!

 

[ayeshaK]

ya i know

U havve written day after tmwrw

 

[Dukeofwin]

b?

A and D are out of question, while C is not possible since the device is earthed.
B is the correct answer, the reason to which is that when heat increases the resistance decreases thus allowing more current to flow which is above the range of the fuse!

 

[syed1995]

go on website elephantfurry physics and view animation...thats how i got it syed1995

where ?? and yea the answer is B. I remembered it but I don't know WHY it is B.

 

[Dukeofwin]

A Repeat Question almost every 2-3 years .. I know the answer but what's the logic behind it?

A and D are out of question, while C is not possible since the device is earthed.
B is the correct answer, the reason to which is that when heat increases the resistance decreases thus allowing more current to flow which is above the range of the fuse!