Questions

Brightness of bulb depends on both voltage and current. The brightness depends on power.

Since we know that  Power (P) = Voltage x Current = V I

So whether you increase the current or the voltage the brightness will increase.

Example Illustration:

 If you connect a long bulb and a round bulb in series, the long bulb glows but the round bulb does not. Both of them have the same current flowing through them (they are in series) but the long bulb has a greater voltage across it because it has more resistance (even though V= IR is not obeyed exactly, voltage drop does depend on the resistance). If you connect a round bulb and a long bulb in parallel, however, it is the round bulb that is brighter because now the voltage across both bulbs is the same but the current is larger through the round bulb (smaller resistance).

Hence, the brightness of a bulb depends on power i.e, both voltage and current.

‘Attacked on him’ is the incorrect form of phrasal verb that needs to be replaced with ‘Attacked him’ to make the sentence correct. This is because; ‘Attack’ is not followed by any preposition. Thus, the correct sentence would be, ‘That Brutus, who was his trusted friend had attacked him caused heartbreak to Julius Caesar’.

Rocket works on the principle of conservation of momentum. The rockets gain momentum equal to the momentum of the gas expelled from the engine, but in the opposite direction.

1*3+1=4

4*3+4=16

16*3+16=64

64*3+64=208 but it is given 126