SAMPLE QUESTIONS OF CLASS 10 | SCIENCE | IMPORTANT QUESTIONS





THIS ARE FEW QUESTIONS OF SCIENCE WHICH INCLUDE ALL TYPES 1 MARK , 2 MARKS 3 MARKS  AND 5 MARKS 




➥MAKE SURE YOU SOLVE THIS QUESTIONS BECAUSE BOARD EXAM IS TO CLOSE 



1.Name a device which converts mechanical energy into electrical energy. Explain the  underlying principle and working of this device with the help of a labeled diagram       

2.Two elements A and B belong to the 3rd period of modern periodic table and are in group 2 and 13 respectively. Compare their following characteristics in tabular form:


(i) Number of electrons in their atoms
(ii) Size of their atoms
liii) Their tendencies to lose electrons
(iv) The formula of their oxides
(v) Their metallic character
(vi) The formula of their chlorides.                                                                         

3.Fresh milk has a pH of 6. How do you think the pH will change as it turns into curd? Explain.


4.Fill in the blank with appropriate reactant(X)  and product (Y and Z).

Na2CO3+ (X) → Na2SO4+ (Y) + (Z)
(a) X = HCl, Y =NaCl, Z = CO2
(b) X = H2SO4, Y =H2O, Z =CO2
(c) X = H2O, Y =H2SO4,Z =CO2
(d) X = NaHCO3, Y =H2O, Z =CO2

5.Compound used in making fire extinguisher:

(i) Caustic Soda
(ii) Baking soda
(iii) carbon dioxide
(iv) washing soda

6.What is a neutralisation reaction? Give two  examples.

7What is the difference between displacement and double displacement reaction? Write equations for these reactions.

8.A metal salt MX when exposed to light, split up to form metal M And a gas X2 . Metal M is used in making ornaments whereas gas X, is used in making bleaching powder. The salt MX is itself used in black and white photography.
(i) Identify metal M and gas X2.
(ii) Mention the type of chemical reaction involved when salt MX is exposed to light.




9.Name the substances which on addition to acetic acid produce carbon dioxide gas? Give relevant chemical equation for the above.
(ii) How is CO2 gas tested in the laboratory?                                                                2 marks

10.Name a device which converts mechanical energy into electrical energy. Explain the underlying principle and working of this device with the help of a labelled diagram.                   

11.Give any for qualities of an ideal source of energy?      .

                                          
12.Write limitations of Newland's law of octaves .    
                                                      

13.Name any two energy source that you should conider to be renewable  

14..Draw a diagram to show magnetic field due to bar magnet 

15.What is meant by electromagnetic induction? Name one device which works on the principle
of electromagnetic induction.
(ii) Describe three different ways to produce
induced current in a coil of wire.   


16.(i) Name the element with atomic number 
(ii) To which group does it belong?
(iii) To which period does it belong?
(iv) Write its electronic configuration. 

17..Differentiate between modern periodic table &  mendeleev' periodic table. 


18.An organic compound 'A' is an essential constituent of wine and beer. Oxidation of 'A' yields an organic acid B' which is present in vinegar. Name the compounds 'A' and B' and write their structural formula. What happens when 'A' and B' react in the presence of an acid catalyst? Write the chemical equation for the reaction.


CLICK ON BLOW LINK FOR IMPORTANT QUESTIONS OF CHAPTER 4 CARBON AND ITS COMPOUND 

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