Physics
The fact that two large ships travelling on close parallel courses in the same direction tend to move towards each other can be explained by

Earth's gravitational force
Magnetic properties of the ship's material
Newton's third law of motion
Bernoulli's principle

ANSWER DOWNLOAD EXAMIANS APP

Physics
When a pail of water is swung in a vertical circle, the water does not fall out at the top of the loop when the speed is

Above a certain minimum value irrespective of amount of water in the pail
Below a certain minimum value irrespective of amount of water in the pail
Above a certain minimum value depending on amount of water in the pail
Below a certain minimum value depending on amount of water in the pail

ANSWER DOWNLOAD EXAMIANS APP