Question

important questions in physics class 9th Ch 3

Answer 1

in class 9th physics that is chapter 3 gravitation the most probably the derivations are going to come because my exam is done most maks ques were of the basic derivation would be of the universal law of gravitation and if it comes for 5 marks then then the derivations would be for the weight of object on moon with comparison to earth 1 questions will always come for relative density and and to calculate the value of g during in the case of free fall and a mass would always be given with the distance another most of the last question that would be coming is would be most probably for upthrust
only these many things came in my test so I am just advising you to read these topics thoroughly

Answer 2

Answer:

Here's your answer.

Explanation:

Q1) Name the scientist who laid the foundation of the chemical sciences and led to chemistry studies. Also, provide the answer to how did he find it?

Q2) Write down the law of conservation of mass by giving the example of a chemical reaction.

Q3) What is the law of constant proportion, and how does it help students perform chemical reactions?

Q4) Which world organization approves all the names of the elements we see in our textbooks and use in our daily lives? Also, write the symbol of mercury.  

Q5) Write down the symbols of Oxygen and Hydrogen.

Q6) "Atoms of most of the elements tend to not exist on their own" Name the two atoms which can exist as an independent atom.  

Q7) Provide one relevant reason in your answer for why the scientists have chosen 1/16 of the mass of an atom of a naturally found oxygen as the atomic mass unit.  

Q8) Which of the postulates from Dalton's atomic theory results from the law of conservation of mass?

Q9) What are the two drawbacks of Dalton's atomic theory and how were they corrected?  

Q10) How will you be able to differentiate between the molecule of a given element and the molecule of a given compound?