SHUBHAKAMANA ACADEMY
Kirtipur-15-Taudaha
Third Term Exam -
2073
Sub-Science
F.M:
75
Class-Ten P.M:
30
Time- 2:15 hrs.
Students are encouraged to to answer in their own words as far as
practicable. Priority is given to creativity and clarity but not to rote learning.
Figures in the margin indicate full marks.
Attempt all the questions.
PHYSICS
1. A. Define free-fall. Write down
the conclusion drawn from the coin and feather experiment. Calculate the mass
of the earth if the radius of the earth is 6.4 × 106 m and g = 9.8
m/s2 .
(1+1+2.5)
B. In the context of Nepal " bio-mass
energy is the best source of alternative energy". Justify the statement.
The hydroelectricity is an an indirect source of solar energy. Clarify the
statement. (1+2)
2. A. What is the relation between
density and up-thrust of a liquid? Lower
portion of dam is made stronger than upper portion, why? Write one advantage
and one disadvantage of anamolous expansion of water. (0.5+2+2)
B. State Pascal's law. What amount of
water is displaced when a piece of ice of volume 30,000 cm3 is
placed in water. Density of ice is 0.92 g/cm3. (1+2)
3. A. If three liquids A, B and C
having equal masses are taken in three same size beakers and exposed in the
sunlight. After one hour the increased temperature in each is shown in the
table below.
|
Liquid
|
Increased
temperature
|
Mass
|
|
A
|
800C
|
1 kg
|
|
B
|
600C
|
1 kg
|
|
C
|
330C
|
1 kg
|
i)
Which liquid has the lowest the specific heat capacity and why?
ii)
If all the three liquids are heated to the same temperature
and put in the same beakers separately, which one cools down at last and
why? (1.5+1.5)
B. What is magnification of lens?
What is long sightedness? State the two causes of the defect and draw the
diagram to show how this defect can be corrected. (1+0.5+2)
4. A. Write any two differences
between a filament lamp and a fluorescent lamp. In a house, 10 bulbs of 60
watt, 4 bulbs of 100 watt and a 750 watt refrigerator are connected in 220 volt
and used for 5 hours daily. Calculate the total electricity consumption in a
month. (2+2)
B. What is motor effect? What type of
transformer is used in the radio, TV, etc.? Find out the voltage in the
secondary coil having 400 turns provided with 220 V primary voltage in the
primary coil of 2000 turns. (1+0.5+2)
CHEMISTRY
5. A. Write any two characteristics
of modern periodic table. Study the given table and answer the following
questions.
|
Elements
|
Electronic
configuration
|
|
A
|
1S2,2S2,2P6,3S1
|
|
B
|
1S2,2S2,2P6,3S2,3P6,4S1
|
|
C
|
1S2,2S2,2P6
|
i)
What is the valency of C?
ii)
Which is more active between the element A and B, why? (2+0.5+1.5)
B. Draw a neat and well labeled
diagram for the preparation of carbon dioxide gas in the laboratory. Write the
structural formula of ethyl alcohol. Name the compound below: H – C = C – H. Is it saturated or unsaturated hydrocarbon,
why?
(2+0.5+1)
6. A. Which metal is obtained from
haematite? Write the chemical equation
for the reaction between this metal and dilute sulphuric acid. What is the pH value
of the neutral substance? Write with an example. (0.5+2+0.5+0.5)
B. What are the substances used to
make lead crystal glass? Environmentalists request to avoid the use of plastic,
why? (2+2)
BIOLOGY
7. A. Draw the diagram of a virus and
label any two parts. What is reflex action? Write the name of hormone that
controls sugar in the blood. Give one example of positive photo taxis. (2+1+0.5+1)
B. Define heart beat? Write any two
differences between auricle and ventricle. (1+2)
8. A. Define meiosis cell division.
It is called reductional cell division, why? Write the two significance of this
cell division. (1+1.5+2)
B. Write any one difference between
primary mycelium and secondary mycelium. Write any two advantages that can be
obtained from the vegetative propagation by farmers. (1+2)
9. A. What is hybrid? Draw a chart to
show the result obtained in the first and second filial generation by crossing
a black rat and white rat according to Mendelism. (1+2.5)
B. What is nitrogen fixation? Write
one phylum or division of the following living beings with one major character.
I) bat ii) sea horse iii) cycas (1+3)
ASTRONOMY AND GEOLOGY
10. A. Scientists have said that human beings and
the earth did not come into existence at the same time, why? How is fossil formed? What is the importance
of ozone layer? (1+1.5+1)
B. Write any two differences between
meteor and comet. Name one spiral galaxy. How is red giant star formed? (2+0.5+1.5)
THE END
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