#### Second Revision Test

9th Standard

Reg.No. :
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Science

Time : 01:30:00 Hrs
Total Marks : 50

Section-A

5 x 1 = 5
1. ____________is the fundamental quantity.

(a)

Length

(b)

Area

(c)

Volume

(d)

Density

2. Force involved in uniform circular motion is given by _______________

(a)

f = mv2/r

(b)

f = mvr

(c)

f= mr2/v

(d)

f = v2/r

3. The focal length of a concave mirror is 5cm. Its radius of curvature is

(a)

5 cm

(b)

10 cm

(c)

2.5 cm

4. For a simple distillation process we need to have

(a)

an evaporating dish

(b)

a separating funnel

(c)

a filter with filter paper

(d)

a Liebig condenser

5. The number of protons, neutrons and electrons present respectively in $_{ 35 }^{ 80 }{ Br }$

(a)

80, 80, 35

(b)

35, 55,80

(c)

35, 35, 80

(d)

35, 45, 35

6. Section-B

5 x 1 = 5
7. Consider an object is rest at position x = 20m. Then its displacement – time graph will be straight line to _____________ the axis.

()

Parallel to

8. The ratio of sine of the angle of incidence to the sine of  _________ is a constant

()

Infraction

9. Chromatography is based on the principle of ______

()

different solubilities in the same solvent

10. Calcium and Argon are examples of a pair of __________

()

isobars

11. Dehydration is based on the principle of removal of _______________.

()

water/moisture

12. Section-C

5 x 1 = 5
13. Thomson

14. (1)

Starfish

15. Shoots growing towards the light

16. (2)

Father of computer

17. Echinodermata

18. (3)

Plum pudding model

19. Iron

20. (4)

Anaemia

21. Charles Babbage

22. (5)

Positive phototropism.

Section-D

5 x 1 = 5
23. The SI unit of electric current is kilogram

(a) True
(b) False
24. When an object is at the centre of curvature of concave mirror the image formed will be virtual and erect.

(a) True
(b) False
25. Oil and water are immiscible in each other

(a) True
(b) False
26. Smaller the size of the orbit, lower is the energy of the orbit

(a) True
(b) False
27. ISI mark is mandatory to certify agricultual products

(a) True
(b) False
28. Section-E

3 x 2 = 6
29. Convert : 104°F in to Celsius scale.

30. Clues:
Down:
1. Helium Nuclei (Particle)
2. Positive Charge mass at the core of the atom
3. An atom whose valency is zero
4. One or two electrons in the outermost shell of atoms of elements are called as ______________ electrons.
5. $_{ 6 }^{ 14 }{ C }$is used for carbon dating
6. Discovery of neutron

Across:
1. Electrons present in the outermost shell
2. This pair of atoms$_{ 20 }^{ 40 }{ C }a,\quad _{ 18 }^{ 40 }{ Ar }$ are ____
3. An atom that does not have neutron
4. Scattering of α particles in the gold foil experiment

31. Name some Natural Preservatives.

32. Section-F

3 x 3 = 9
33. A sound is heard 5 s later than the lightning is seen in the sky on a rainy day. Find the distance of location of lightning? Given the speed of sound = 346 ms-1

34. How will you separate a mixture containing saw dust, naphthalene and iron filings?

35. What is data processing?

36. Section-G

3 x 5 = 15
37. Calculate the diameter of the sphere which is shown in the Figure  Assume the scale has no zero error

38. Hydrogen sulphide (H2S) contains 94.11% sulphur, water (H2O) contains 11.11% hydrogen and sulphur dioxide (SO2) contains 50% of oxygen. Show that the results are in agreement with the law of reciprocal proportions

39. Describe the characteristic features of different Prochordates with suitable diagrams.