Mechanics & physics,can anyone explain the scenarios?Very practical Questions?

[flabber]

Mechanics & physics,can anyone please explain the scenarios?Very practical Questions?

Hi...Can anyone please be kind enough to help me? i know it will take a bit longer for u to answer. I have some scenarios and questions in the following pages:

http://www.geocities.com/flabberguest_gabcraft/pg1.jpg
http://www.geocities.com/flabberguest_gabcraft/pg2.jpg

These are related to physics & mechanical aptitude test. I know the answers but i am not able to explain them with the help of theories. Can anyone please help me explain these situations. Please take a look it is interesting thanks in advance ...
for assistance I'm providing the Answers:
Q1 = A
Q2 = B
Q3 = A
Q4 = don't know
Q5 = A
Q6 = B
Q7 = don't know
Q8 = B
Q9 = don't know

 

[Badi]

I think that Q4 = C because the the magnetic field which is induced by the current flowing in the wire is not in any of the direction described in A or B (It is actually normal to the plane of the screen.
Also, Q3 = A because the torque of a force acting at a larger distance from the center of rotation is larger than one acting close to the center, that is torque = F x r where r is the distance from the center and x is a cross product.
Also Q8=B because saw dust is more thermally insulating than air, I suppose.

 

[Subductionzon]

Question 9 is A since three points define a plane. More than that and you will have at least one leg off the floor on uneven ground.