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1.
Draw electron dot structure of H2.
2.
What is the criteria for the arrangement of elements in
the modern periodic table?
3.
Budding is one of the mode of reproduction in yeasts.
[true/false]
4.
The germ cells of human contains 23 pairs of chromosomes. [true/false]
The germ cells of human contains 23 pairs of chromosomes. [true/false]
5.
Who postulated the hypothesis - ‘evolution takes place due to natural
selection’
6.
What do you mean by acquired traits?
7.
Define focal length of a spherical mirror.
8.
What is Fovea centralis?
9.
Name one gas responsible for acid rain.
10. What
are two properties of carbon which lead to the huge amount of carbon compounds
we see around us? 11. What do you mean by “Law of octaves”?
12.
Differentiate between atomic mass and atomic number.
13.
How does the creation of variations in a species
promote survival?
14. Give
the phenotypic and genotypic ratio of a monohybrid cross.
15.
Why are the small numbers of surviving tigers a cause of worry from the point of view of genetics?
Why are the small numbers of surviving tigers a cause of worry from the point of view of genetics?
16. What
is Myopia? Suggest the corrective measures for it.
17.
Why is colour of sky blue?
18.
What is law of reversibility of light?
19. What
will be the formula and electron dot structure of cyclopentane?
20. (a)
What were the limitations of Döbereiner’s classification?
(b) What were the
limitations of Newlands’ Law of Octaves?
21.
How is the sex of the child determined in human beings?
22. Describe
the formation of rainbow with diagram?
23. A
convex mirror used for rear-view on an automobile has a radius of curvature of
3.00 m. If a bus is located at 5.00 m from this mirror, find the position,
nature and size of the image.
24. An
object is placed between the focal length and radius of curvature of a concave
mirror. Draw a ray diagram to show the formation of image and right the
characteristics of the image formed.
25. Ethanol,
commonly called as alcohol is an excellent solvent, is used in medicines and is
an important chemical compound involved in synthesis of many chemical
compounds. However in spite of its benefits to man, its impact on social
behaviour has always been questioned. Media has often show abnormal behaviour
of people while drunk. It is considered as a curse in the lives of those who are
addicted to alcohol – ‘Alcoholic’ people are not only lowering their metabolism
and affecting Central Nervous System, they are also a threat to the lives of
others. Anger and rude behaviour are some of its ill effects.
(i)
Comment on the statement –
‘Should production of alcohol should be banned’, give three valid reasons to
justify.
(ii)
As a student what initiative would you take in the
common concern of ‘Save Life, Do not Drink’. Give two suggestions.
Or
A 2.0 cm tall
object is placed perpendicular to the principal axis of a concave lens of focal
length 10 cm. The distance of the object from the mirror is 15 cm. Find the
nature, position and size of the image formed. Represent the situation with the
help of a ray diagram.
26. Draw
a well labeled diagram of human eye. What is power of accommodation?
Or
Make a diagram to
show how hypermetropia is corrected. The near point of a hypermetropic eye is 1
m. What is the power of the lens required to correct this defect? Assume that
the near point of the normal eye is 25 cm.
27. Draw
the electron dot structures of -- Cyclopentane, methane, S8, N2.
Or
Write the history
of development of periodic table in brief.
Markings:
question no. 1 – 9 contains 1 mark each [1x9 = 9] Question no. 11 – 18 contains 2 marks each[2
x 9 = 18]
Question no. 19 – 24
contains 3 marks each [3 x 6 = 18]
Question no. 25 – 25
contains 5 marks each [5
x 3 = 15]
Total = 9 + 18 + 18 + 15
= 70 marks
