# 25 msk educational academy english medium

```MSK EDUCATIONAL ACADEMY ENGLISH MEDIUM SCHOOL
KAVITAM
UNIT-II
9 CLASS PHYSICAL SCIENCE
25
TH
Time: 1 hour
Max.Marks: 25
NAME: ……………………………………………………………………………………………ROLL NO:…………………
I Answer any three of the following questions
1.
2.
3.
4.
Derive V=U+at?
Define the terms renewable and non-renewable sources of energy?
Define Kinetic Energy and Potential Energy?
Define Oxidation and reduction according to modern concept?
II Answer any three of the following questions
5.
6.
7.
8.
3x2=6m
3x1=3m
Define work?
What is meant by horse power?
What is an octet?
What are the forces present in ionic bond?
III Answer any Two of the following questions
2x4=8m
9. Derive S= ut + &frac12; at?
10. Write ten examples of objects possessing kinetic Energy?
11. Explain how the following molecules are formed. Indicate the type of bond formed in them.
Write the equation with electron dot model?
a) Sodium Chloride b) Hydrogen fluoride
6x &frac12; =3m
12. Negative acceleration is called
(
a) Momentum
b) Inertia
c) Retardation
d) Resultant
13. Dis placement
(
a) Average velocity /time
b)Average velocity X time
c) Average velocity X acceleration
d) Time/Average velocity
14. The unit of work in C.G.S. system
(
a) Erg
b)Dyne
c) Joule
d) Newton
15. One horse power =
(
a) 𝟏𝟎𝟏𝟎 ergs
b) 746 Watts
c) 550 Watts
d) 𝟏𝟎𝟓 ergs
16. Triple bonds are present in _________________molecules
(
a) Oxygen
b) Chlorine
c) Hydrogen
d) Nitrogen
17. Ionic substances are soluble in
(
a) Benzene
b) Kerosene
c) Ether
d) Water
)
)
)
)
)
)
V Fill in the blanks
5x &frac12; =2 &frac12; m
18. Covalent compounds are soluble in…………………………………………………………………solvents
19. Magnesium Chloride is …………………………………………………………………………………..compound
20. Coal. Petroleum and Natural gas are………………………………………………………………fuels
22. The motion of a rocking horse is an example of ……………………………………………………..
VI Match the following
5x &frac12; =2 &frac12; m
Group A
23.
24.
25.
26.
27.
Group B
Covalent bond
ionic bond
Polar molecule
Bond angle in Ammonia molecule
Bond angle in water molecule
(
(
(
(
(
)
)
)
)
)
A) 107&deg;
B) Oxygen molecule
C) 109&deg;
D) MgO molecule
E) 105&deg;
F) Ne atom
G) HCI molecule
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```