OMTEX CLASSES
Science preliminary paper MAHARASHTRA
STATE BOARD
Section
A
Q1.
Solve the following: 7
Marks
i.
If 3 Ω, 4 Ω and 5 Ω are connected in series then the equivalent resistance is
_____________.
ii.
Match the column:
|
Column A
|
Column B
|
|
1. Concave mirror
2. Convex lens
|
a. Microscope
b. Solar furnace
c. Rear view mirrors
|
iii.
Find odd man out:
1. Sodium carbonate, Copper
sulphate, Sodium bicarbonate.
2. Boron, Silicon, Arsenic, Sodium.
iv.
What is SI unit of potential difference?
v.
Define potential difference.
Q2.
Answer the following sub questions: 6
marks
i. Distinguish between convex mirror
and concave mirror.
ii. The melting point of filament of
a bulb is very high. Why?
iii. A simple microscope is used by
watch repairers. Why?
Q3.
Answer Any Four of the following questions: 12
marks
i. Write a note on indicators with
proper example.
ii. What do you understand by the
term redox reaction? Explain with one example.
iii. It is possible to enjoy a
rainbow at fountains in any season. Why?
iv. a.
Define electric motor.
b. Explain why alloys like alnico or nippermag
are used in industry.
v. Explain the features of modern
periodic table.
Q4.
Answer any one of the following questions: 5
marks
i. Explain the construction, working and uses of Electric motor.
ii. Find the expression for the
resistance connected in series, how are the appliances connected
at home? Why?
Section
B.
Q5.
(A) Fill in the blanks: 3
marks
i. The digested food is absorbed by
the ________ in the small intestine.
ii. __________ is the largest gland
in the body.
iii. Brain is the main
______________ centre of the body.
(B)
Answer in one sentence 4
marks
i.
Components of central nervous system.
ii.
Vestigial organs or structures found in human.
iii.
What is catenation.
iv.
The crystalline allotropes of carbon.
Q6 .
(A) Give scientific reasons: 4 marks
i.
Translocation is needed in all higher tall plants.
ii.
A plant kept near a window bends towards light.
Q6. (B)
Distinguish between : 2 marks
Transpiration and Translocation.
Q7.
Answer any four of the following questions: 12 marks
i. Explain Darwin's theory of evolution.
ii.
How are fats digested in human body?
iii.
Explain co – ordination in plants.
iv.
State and explain how alkanes are further classified.
v.
How can one change the property of metals which are corrosive and prevent them
from getting corroded? Explain
giving an example.
Q8.
Answer in detail (Any one) 5 marks
i. With the help of a diagram describe the various parts of a flower.
ii.
Write any five Application of Convex lens.
=============All
the best==============
