JKBOSE 10th Class Model Paper Science

Class: 10h Time: 3 hrs

Subject: Science Max. Marks: 80

(Physics, Chemistry and Biology)
SECTION-A
Note:- Q. NOs 1to 18 Very Very Short Answer Type Questions of 1 mark each.
1.The radius of Curvature of a spherical mirror is20cm. What is its focal length.
a) 12 cm b) 10cm
c) -10 cm d) 2 cm
2. Power of Concave lens of focal length 200 cm

a) 0.8 D b) 1.5 D

c) 0.5 D d)5 D
3. The change in focal length of eye lens is caused by the action of the

a) Pupil b)Retina
c) Ciliary muscles d) Iris
4. How much work is done in moving a charge of 2C across two points having potential difference

12 v ?

a) 24 J b)26 J
c) 12 J d) 2.4 J
5. The device used for producing electric current is called

a) generator b) Ammeter

c) galvanometer d) motor
6. Asolution terns red litmus blue, its PH likely to be

a) 1 b) 5

c) 4 d) 10
7. In order to balance the following chemical equation, the value of Cofficients x and y resp. are
Heat
xpb( NO,)z 2Pbo + yNo, + O;

a) 2, 4 b) 2, 2

c) 2, 3 d) 4, 2
Ethane with molecular formula C, H6 has

a) 6 Covalent bonds b) 8Covalent bonds

c) 7 Covalent bonds d) 9 Covalent bonds

because
9. Food cans are Coated with tinand not with zinc
a) Zinc is more reactive than tin

b) Zinc is less reactive than tin
c)Zinc is costlier than tin

d) zinchas higher melting point than tin
10. Melting point of Acetic acid is :

a) 290 K b) 209 K

c) 391 K d) 211 K

11. The kidney in human beings are part of which system:
a) Nutrition b) Respiration
c) Excretion d) transporation
12. The brain is responsible for
a) Thinking b)Balancing body
c) Regulating the heart beat d) Allof the above
13. The Anther contains:

a) Sepal b) Pistil
c) Ovules d) pollen grains
14. In evolutionary terms we have more in common with:
a) a Chinese school boy b)a spider
c) a chimpanzee d) a bacterium
15. living has always been part of India's tradition and culture.
a) Sustainable b)Sad
c) Happy d) Economic

1x 15 =15 Marks

Note: For QNo's 16 to 18,two statements (Assertion 'A' and Reason
'R') are given. Select the
Correct answer to these questions from the Codes (a),(b),(c) and (d) as given
below:
Code(a):A and Rare true and Ris correct explanation of A
Code(b): Both A and Rare true and R is not correct
explanation of A
Code(c): Ais true but Ris false
Code(d): A is false but R is true

16. Assertion (A): Magnetic field lines don't intersect each other
Reason (R) : Magnetic field lines are imaginary lines, the tangents to which any point gives
the direction of the field at that point.
17. Assertion(A): Metallods are classified as semi-metals
Reason (R): Metalloids are intermediate in properties then exhibit properties of both metals
and non- metals.
18Assertion(A): An aerobic respiration, one of the end product is alcohol.

Reason (R): There is an incomplete breakdown of glucose.

1x3 = 3 Marks

SECTION -B

Note: - There will be 10 Questions in this Section.
Q.No's from 19 to 28 ( Each of 2 Marks)

19. Why planets don't twinkle?
20. Discuss four properties of ionic compounds.

21. Why do acids don't show acidic behaviour in the absence of water?
22. An electric motor takes 5Afrom a 220V line. Determine the power of the motor and energy

Consumed in 2 hours?

23. Define Ohm's Law and draw the Circuit diagram
24. sHowwould you able to check if the water is hard by using detergent?

25. What Criteriado we use to decide whether something is alive?

26. Why is DNA Copying an essential [art of the process of reproduction?
27. How do mendel's experiment show that traits may be dominent or recessive?
blood?
28. How does our body respond when adrenaline is secreted into

SECTION-C
(Each of 3 Marks) ]
Note :- There will be 9 questions [ Short Answer With internal choice
Q.No's 29 to 37

29. Write Sign Convention for spherical mirrors

Or
lens be
AConcave lens has focal length of 15cm. At which distance should the object from the
placed so that it forms an image at 10cm from the lens? Also find the magnefication produced by the
lens.

30. Explain Myopia with its occurence and Correction

Explain Hypermetropia with Occurence and Correction.

31. 100J of heat is producedeach secondin a 4T resistance. Find the potential difference across the
Resistor.
Or

Why is the series arrangement not used for domestic circuits.

32. How would you distinguish experimentally between an alcohol and a carboxylic acid?
Or

Explain oxidising agents with examples.

33. Why pure gold is not suitable for making jewwllery?
Or

Define the following terms
a) Mineral
b) Ore

c) Gangue

34. Why magneisum ribbon is cleaned before heating
Or

Balance the following reacton
a) Zn + CusO, ZnSO, + Cu
b) Na + 0, Na,0
c) HNO,+ Ca(OH), Ca(NO,),+ H,0

35. What are the differences between the transport of materials in Xylem andpholem/
Or

Describe double Circulation of blod in human beings. Why is it necessary?

36. How does binary fission differ from multiple fission?
Or

Why is egetative propagation practised for growing some types of plants?

37. What will happen if we kill all the organisms in one tropic level.
Or

What is Ozone and how does it affect any ecosystem?

9x3 = 27 MarkS

SECTION-D
with internal choice [ Each of 5 Marks]
Note :- There will be 3 Long Answer Type Questions
[Q. NO's 38 to 40]
magnification produced by lens. (05)
38. Define Power of Lens and its S.l unit. Also describe
Or

Answer the following questions

a) Explain Snell's Law. (01)
an astronaut? (02)
b) Why Sky appear dark instead of blue to
potential difference between two
c) How is Voltmeter Connected in the Circuit to measure the

points?
(02)

esterification. (05)
39. What is an Esterification Reaction? Describe an activity to show
Or

Answer the following questions
a) Write the uses of Baking Soda (02)
acid. (01)
b) Draw election dot structure for Ethanoic
(02)
c) Whyis respiration Considered an exothermic reaction.

40. Answer the following questions
(02)
a) How and where does fat digested
gland? (02)
b)Why pitutary gland is called Master

c) Name two biodegradable substances. (01)
Or

Answer the following questions
a) What is photosynthesis and write its reaction? (02)
b) Define Reflex arc. (02)
c) Name two non-biodegradable substances (01)

5x3=15 Marks