The Fundamental Unit of Life — Science STD 9 — Question

What is cyton?

What happens to the buoyant force as more and more volume of a solid object is immersed in a liquid? When does the buoyant force become maximum?

Joseph jogs from one end A to the other end B of a straight 300m road in 2 minutes 30 seconds and then turns around and jogs 100m back to point C in another 1 minute. What are Joseph’s average speeds and velocities in jogging (a) from A to B and (b) from A to C?

An empty plastic bottle floats, while a plastic bottle filled with sand sinks in water. Why?

What would you observe when:
A saturated solution of potassium chloride prepared at 60°C is allowed to cool to room temperature.

What can you say about the motion of a body if:

1. Its displacement-time graph is a straight line?
2. Its velocity-time graph is a straight line?

A man standing 825 metres away from a cliff (steep rock) fires a gun. After how long will he hear its echo? Speed of sound in air is 33m/s.

A pair of bullocks exerts a force of 140N on a plough. The field being ploughed is 15m long. How much work is done in ploughing the length of the field?

Suggest separation technique(s) one would need to employ to separate the following mixtures:
Mercury and water.