SA 1 Model Paper 1

TENTH CLASS MODEL PAPER (AP)

SUMMATIVE ASSESSMENT - 1

GENERAL SCIENCE (Physical Science)

PAPER - I (English Version)

Time: 2 Hrs. 45 Min. Max.Marks: 50

Instructions:1) There are four sections and 33 questions in this paper.

2) Answers should be written in a given answer booklet.

3) There is an internal choice in Section - IV.

4) Write all the questions visibly and legibly.

SECTION - I

Note:i) Answer All the questions.12 x1/2= 6

ii) Each question carries 1/2mark.

1. SI unit of temperature is ......

2. Three bodies A, B, C are in thermal equilibrium. The temperature of B is 45°C. Then what is the temperature of C?

A) 45°C B) 90°C C) 40°C D) None

3. Complete the following equation.

Acid + Base → ....... + Water

4. Which gas evolves when acids react with metals?

5. What is the speed of light in vacuum?

6. X : Refractive index n = c/v

Y : Refractive index has no units.

A) Both are correct B) X is correct, Y is wrong

C) X is wrong, Y is correct D) Both are wrong 

7. What is the shape of p - orbital?

8. Which rule is violated when two electrons in an 2s orbital possesses same clock wise spin?

9. Lens Focal length

A +20 cm

B −15 cm

Identify the convex lens from above table.

10. Which lens can form real and virtual image?

11. Match the following.

a) eka Boron ( ) x) Germanium

b) eka Aluminium ( ) y) Scandium

c) eka Silicon ( ) z) Galium

12. Highest electronegativity : Fluorine : : Highest electropositivity : .......

Identify the element name should be kept in the blank.

SECTION - II

Note: i) Answer All the questions. 8 x 1 = 8

ii) Each question carries 1 mark.

13. Convert 20°C into Kelvin Scale.

14. What role does specific heat play in keeping a water melon cool for a long time after removing it from fridge on a hot day?

15. Why pure acetic acid does not turn blue litmus to red?

16. Observe the following table.

Medium                     Water.             Crown glass

Refractive Index         1.33                     1.52

Which is the denser medium? Explain.

17. Draw the shape of s − orbital.

18. Write the lens formula.

19. An element has atomic number 19. Where would you expect this element in the periodic table.

20. Define the modern periodic law.

SECTION - III

Note: i) Answer All the questions. 8x 2 = 16

ii) Each question carries Two marks.

21. Why water inside a clay pot becomes cool?

22. How do you appreciate the role of the higher specific heat of water in stabilizing atmospheric temperature during winter and summer seasons?

23. Why does not distilled water conduct electricity?

24. Why does tooth decay start when the pH of mouth is lower than 5.5?

25. What are the factors that influence the refractive index?

26. Explain why electrons enter into 4s orbital but not 3d orbital after filling the 3p orbital.

27. Frame any two questions to understand difference between convex lens and concave lens.

28. Define Dobereiner law of triads and give one example.

SECTION - IV

Note: i) Answer All questions. 5 x 4 = 20

ii) Each question carries 4 marks.

iii) Each question has an internal choice.

29. a) Write the factors that effect the process of evaporation. Explain with suitable examples.

(OR)

b) Define the following terms.

i) Refractive Index ii) Laws of Refraction

30. a) Explain the significance of three quantum numbers in predicting the positions of an electron in an atom.

(OR)

b) Discuss the construction of the long form of the periodic table.

31. a) Explain the relationship between the angle of incidence and angle of refraction with an experiment.

(OR)

b) How do you find the focal length of a convex lens experimentally by U − V method?

32. a) Complete the following table.

Sub shell name ‘l’ value No.of orbitals ml values Max.no.of electrons

(OR)

b) The electron configuration of A, B, C, D and E are as follows.

A − 1s2 2s2 2p1 

B − 1s2 2s2 2p6 3s2 3p1

C − 1s2 2s2 2p6 3s2 3p6

D − 1s2 2s2 2p6 3s2 3p3 

E − 1s2 2s2 2p6

Based on the above information answer the following questions.

i) Which of these belongs to same group? 

ii) Which of these belongs to same period?

iii) Name of the element E. 

iv) Which element belongs to s − block?

33. a) Draw a neat diagram showing acid solution in water conducts electricity.

(OR)

b) Draw ray diagrams for the following positions of convex lens.

i) Object is placed beyond 2F2.

ii) Object is placed between 2F2 and F2.