PHYSICS CH3 Fluids — Science STD 9 — Question

Symbol	Atomic No.	Electronic Configuration
1) He	2	?
2) Ne	?	2,8
3) Ar	?	2, 8,8
4) Na	11	?

 

Two immiscible liquids are taken in the above funnel for separation. Which is denser, X or Y? Suggest any one example for X and one for Y. A third liquid Z which is soluble only in Y is added to the mixture and contents in the funnel are shaken well. How many layers will you observe now? How will you separate the three liquids? Boiling point of X is 98°C, that of Y is 43°C and that of Z is 75°C.

Explain the Archimedes principle with an example.

Higher Order Thinking Skill.

Imagine that student A studied the importance of certain factors in photosynthesis. He took a potted plant and kept it in dark for 24 hours. In the early hours of the next morning, he covered one of the leaves with dark paper in the centre only. Then he placed the plant in sunlight for a few hours and tested the leaf which was covered with black paper for starch.

1. What aspect of photosynthesis was being investigated? 
2. Why was the plant kept in the dark before the experiment? 
3. How will you prove that starch is present in the leaves?
4. Name the raw materials needed for photosynthesis.

Define acceleration and state its SI unit for motion along a straight line, when do we consider the acceleration to be (i) positive (ii) negative? Give an example of a body in uniform acceleration.

Distinguish e.m.f and potential difference.

Compare types of Bio fertilisers with their functions.

Convert the following units in metre.

Higher Order Thinking Skills. 

Light ray emerges from water into air. Draw a ray diagram indicating the change in its path in water.