SSC Papers for Practice Science I Maharashtra Board
I) A.Rewrite
the following statements with suitable words in the blanks: (5)
i. Convex mirror : Diverging : :
Concave mirror : ________
ii. Acid rain : Corrosion of building : : ________: Skin cancer
iii. Oil spill : ________ : :
Land fill : Soil pollution
iv. Fluorine : 2,7 : : Chlorine
: ________
v. Red colour : Bends the least : : Violet colour : ________
I) B.
Rewrite the following statements by selecting the correct options: (5)
i) If a ray of light propagating in air strikes a glass slab at
an angle of 300with the surface of the slab, the angle of refraction
is________.
a) 900
b) Less than 600
c) 600
d) More than 600
ii) The clear supernatant
solution of soil and water turns the pH paper yellowish orange. Which of the
following would change the colour of this pH paper to greenish blue?
a) Kokam extract
b) Vinegar
c) Common salt
d) An antacid
iii) A candle of 15 cm is
placed in front of a plane mirror, the height of the image formed will be ________.
a) 30 cm
b) 15 cm
c) 1/15 cm
d) 5 cm
iv) Student dipped pH paper in
oxalic acid and checked the colour of pH paper. pH paper turns ________.
a) Green
b) Orange
c) Purple
d) Blue
v) If three resistances of 2
ohm, 3 ohm and 4 ohm are connected in series then the effective resistance is
________ ohm.
a) 6 Ω
b) 5 Ω
c) 9 Ω
d) 11 Ω
II) Solve
any five of the following: (10)
i) The power of a convex lens is 2 dioptre. Find its focal
length.
ii) Metallic character
decreases from left to right in a period. Give reason.
iii) Why nichrome wire is used
in heating devices?
iv) State the properties of
magnetic lines of force.
v) What do you observe when H2S
gas is passed through cadmium chloride solution?
vi) Write a note on ammeter.
III) Answer any five of the following: (15)
i) How could the Modern periodic table remove various anomalies
of Mendeleev’s periodic table?
ii) Aqueous solution of a
substance A in the presence of alcoholic medium and cone. HCL gives glucose and
a new sugar rich substance B.
a. Name the substance A and
B.
b. At which temperature is
the reaction carried out?
c. Write the balanced
chemical equation.
iii) A compound of sodium is
used in the kitchen to make pakoras crispy. It is also used to remove acidity
in the stomach.
a. Identify the compound and
write its chemical formula.
b. Why do pakoras become
crispy when this compound of sodium is added to the batter?
c. Write the uses of this
compound other than mentioned above.
iv) Explain the types of water
pollutants.
v) Explain any three factors
on which the resistance of a conductor depends.
vi) What are the rules used
for drawing ray diagrams for formation of image by spherical mirror?
IV) Attempt any one of the following: (5)
i) Explain construction and working of a D.C, generator
(Dynamo).
ii) Explain Newton’s
experiment to show that sunlight is a mixture of seven colours.