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Biology; Chemistry; Physics: Post your doubts here!

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Help Me :)

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Well it should be something like...... TV stations emit micro waves towards a satellite in space, the satellite then reflects the waves to the respective TVs in home, though this process of reflection etc must by highly directional and accurately aimed..... and the waves pass through clouds etc....
What does the marking scheme say?
havent checked if i had i wouldnt have asked :p
 
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Q.6. Answer = D

- Force = Ma
- = 20 x 10 =200N

Q.7. Answer = B

- Pressure 1 = Pressure 2
- 20/40 = x/5
- x = 10N

Q.16 Answer =D

- Discussed Earlier.

Q.18. Dunno :p

Q.19 Answer = C

- Angle of Incidence = Angle of Reflection

Q.20 Dunno :p

Q.27. Dunno :p

Q18: B
As speed and wavelength are directly proportional

Q20: B
As total internal reflection cannot occur at such a small angle of incidence...

Q27: C....
As due to equal resistance, current will be divided equally!!
 
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Q.6. Answer = D


Q.7. Answer = B

- Pressure 1 = Pressure 2
- 20/40 = x/5
- x = 10N


Umm how? Pressure = force/ area.

40 isn't the area.
This is like the Hydraulic systems do force1*distance1 = force2*distance 2. No?
So in that case, 20*40 = 5*force.
800/5= 160 N. D
 
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Guys can you tell me how to draw a "block diagram" related to electricity generation...???
 
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