Physical Science Model Paper 2020

PART - A

PHYSICAL SCIENCE

SECTION - I

NOTE : 1. Answer all the Questions. (6×1=6) 

               2. Each Question carries 1 Mark.

1. If ‘C’ is the speed of light in vaccum and ‘V’ is the speed of light in a medium then what information we get from ‘C/V’ ? 

2. The order of filling of electrons in the orbital of an atom will be

 (A) 3d, 4p, 4s, 4d, 5s (B) 3d, 4s, 4p, 4d, 5s (C) 5s, 4p, 3d, 4d, 4s (D) 4s, 3d, 4p, 5s, 4d 

3. Na, Mg, Zn, Fe, Ag and Au are the few metals of reactivity series of metals.

 Ramu : Fe is a moderate reactive metal. 

Raju : Mg is not a moderate reactive metal. 

(A) Ramu is correct ; Raju is incorrect   (B) Ramu is incorrect; Raju is correct            (C) Both Ramu and Raju are correct     (D) Both Ramu and Raju are incorrect

 4. Read the following statements: 

Statement A :  During evaporation, the temperature of the evaporating liquid                decreases.

 Statement B :  During condensation, the temperature of the surrounding air                       increases. 

(A) Both A and B are true            (B) A is true but B is false                                                (C) A is false but B is true             (D) Both A and B are false

5. Observe the following figure and identify the ‘x’ .

6. Name the chemical substance which is used to make baking powder?

SECTION - II

NOTE : 1. Answer all the Questions. (4×2=8) 

               2. Each Question carries TWO marks.

7. Refractive index of glass is 3/4.  What is the speed of light in glass ? 

8. State Lenz's Law?

9. Write the functional group of Alcohol and Aldehyde? 

10. Which one between Na and Na + would have more size ? Why ?

SECTION - III

NOTE : 1. Answer all the Questions. 

               2. Each Question carries FOUR marks.(4×4=16) 

11. Refractive indices of media P, Q, R and S are

 P-1.31       Q-1.33      R-1.52       S-1.50 

In which of the four media the speed of light is maximum and minimum? Why?

12. The atomic numbers of elements P, Q, R, S and T are given below. 

Element              P       Q       R       S       T 

Atomic number 7       10      12      4       19 

From the above table, answer the following questions.

(a) Which element among these is a non-metal ? (b) Which element belongs to 3rd period of periodic table ? 

13. Why does the picture appear distorted when a bar magnet is brought close to the screen of a television ?  Explain. 

14. Write the uses of bleaching powder and  washing soda?

SECTION - IV

NOTE : 1. Answer all the Questions. (2×8=16) 
               2. Each Question has internal choice. 
               3. Each Question carries 8 marks. 

15. How do you find the specific heat of a solid? Explain with an activity?

                                                                    (OR) 

        How does Ionisation energy varies in group and in periods. what are the factors            that affect ionisation energy?

16. Draw the ray diagrams (i) when object is placed at 2F  (ii) Object placed beyond 2F. 

                                                                    (OR)

     Draw the diagram of froth floatation and magnetic separation.