MAHASAMKALPAM :: CHITTOOR DISTRICT Spell : 2

Subject: Phy. Sci. (1,2 & 3 Lessons)

I. Answer all. Each question carries one mark :-

Max. Marks : 25

4x1 = 4M

1. Convert 270 into Kelvin Scale? 2. Why do we apply paint on iron articles? 3. Write Fermat’ s principle? 4. Which mirror is used as a rear view mirror in the vehicles ? II. Answer all. Each question carries two marks :-

5x2 = 10M

5. Why the water in earthen pot (Matka) cool? Explain. 6. MnO2 + 4 HCl MnCl2 + 2H2O + Cl2 In the above equation name the compound which is oxidized and which is reduced? 7. Ca CO3  x + CO2 in this reaction name the product “x” and say what type of reaction it is? 8. Compare real image with virtual image? 9. Show the formation of image with a ray diagram when an object is placed on the principle axis of a concave mirror away from the centre of curvature ? 2x4 = 8M

III. Answer all. Each question carries four marks:-

10(a). The graph between temperature and time when ice is heated till it becomes water vapour Is given under. Observe the graph and answer the questions given below? i) At what temperature ice converts into water? ii) At which temperature water converts into water vapour? iii) What does AB represents? iv) what is the range of temperature of liquid water? Or

10(b). Fill the following table in the case concave mirror? Position of the object Between mirror and F Between F and C At C Beyond C

Position of the image

Size of the image

Invert/erect

11(a). Name the process in which water dissociates into hydrogen and oxygen on passing the current? Draw a neat labled diagram for that process? Or

11(b). Balance the following chemical equations? i) Zn + AgNO3 Zn(NO3)2 + Ag iii) Ag + H2S Ag2S + H2O

ii) Fe2O3 + C  Fe + CO2 iv) Cu + O2 CuO

IV. Choose the correct answer. Each question carries ½ Mark.

6x1/2 = 3

12 . Three bodies P, Q and R are in equilibrium. The temperature of P is 500 C then the temperature of Q and R are ( ) A) 500 C, 500 C

B) 500 C, 00 C

C) 00 C, 500 C

D) 1000 C, 1000 C

13. Match the following i) ii) iii) iv)

(

)

a) 1 Cal/g0 C b) 80 Cal/g c) 540 Cal/g d) 0.5 Cal/ g0 C

Specific heat of ice Specific heat of water Lateral heat of ice Lateral heat of water vapour A) i–a, ii - b, iii – c iv – d C) i–b, ii - d, iii – c iv – a

B) i–d, ii - a, iii – b iv – c D) i–d, ii - c, iii – a iv – b

14. The reaction of formation of HCl from H2 and Cl2 represents ________ type of reaction. ( A) Decomposition B) Displacement

C) Combination

)

D) Double Displacement

15. Rancidity means

(

A) Improve the quality of food

B) Improve the preservation

C) Spoilage of food by oxidation

D) None of these

)

16. The radius of curvature of a concave mirror is 2m. Then the focal length of the mirror is __ ( A) 2

B) 1

C) 100

.

D) B

17. The mirror which always produce virtual and diminished image is ______ A) Concave

B) Convex

C) Plane

D) None

)

C

(

)