Maharashtra Board Class 10 SSC
Science and Technology -I Question Paper
STD: SSC (Xth) Science and Technology-I Marks: 40 Marks Time: 2 Hours
Q. 1 (A) Choose the correct option. (05)
i) The minimum velocity of the space craft to escape from earth’s gravitational force must be ____________.
A) 112 km/s B)
11.2 km/s C) 1.12 km/s D) 0.112 km/s
ii) The melting point of pure ethanoic acid is ____________.
A) 170C B) 190C C) 150C D) 270C
iii) The separation of light into its component colours while it passes through a medium is called ____________.
A) Reflection B) Refraction C) Dispersion D) Internal reflection
iv) The conversion of ferrous sulphate into ferrous sulphate is ____________ reaction,
A) Oxidation B) Displacement C) Electrolysis D) Reduction
v) The unknown element eka-boron in Mendeleev’s periodic table was named as ____________ after it’s discovery.
A) Gallium B) Scandium C) Germanium D) Sodium
(B) Solve the following. (05)
i) State true or false. An electric motor converts mechanical energy to electrical energy.
ii) Write the correlated answer: Torch : Concave lens : : Camera : ____________
iii) Find odd man out : Nitrogen, Neon, Argon, Helium
iv) Draw the structural formula of C4H10
v) Which satellite
is used in educational field among INSAT and GSAT series?
Q.
2 (A) Give scientific reasons (Any Two). (04)
i) Simple
microscope is used for watch repairs.
ii) The
copper vessels turns greenish and silver articles turn blackish when kept open
in air for long time.
iii) Elements belonging to the same group have some valency.
(B) Answer the following questions
(Any three). (06)
i)
An object takes 5 seconds to reach the ground from a
height of 5 m on a planet. What is the value of ‘g’ on that planet?
ii) Define specific heat capacity. Write its SI unit.
iii) Distinguish between transition and inner transition elements.
iv) What are (i) free fall ii) Escape velocity
v) Explain the similarity and difference in two events, namely adding NaOH to water and adding CaO to water.
Q. 3 Answer the following (Any five). (15)
i) An Iron ball of mass 3 kg is released from a height of 125 m and falls freely to the ground. Assuming that the value of ‘g’ is 10 m/s2, calculate:
a) Time taken by the ball to reach the ground.
b) Velocity of the ball on reaching the ground.
ii) An element has it’s electronic configuration (2, 8, 3). Answer the following questions.
a) What is the atomic number of this element?
b) What is the ‘Group’ of this element?
c) To which ‘period’ does this element belong?
iii) Draw a neat labelled diagram of human eye. Explain power of occomodation of eye lens.
iv) a) Write the ‘endothermic’ or ‘enothermic’ nature of the reaction:
|
|
Position of |
Position of |
Size of |
Nature of |
|
|
object |
image |
image |
image |
|
a) |
...................... |
At focus F2 |
Point image |
Real and |
|
b) |
At 2F1 |
At 2F2 |
...................... |
Real and inverted |
|
c) |
Between F1 and O |
On the same |
Very large |
...................... |
|
|
(within focal |
side object |
|
|
|
|
length) |
side) |
|
|
Q. 4 Solve the following questions (Any One). (05)
i) Answer the following.
a) Draw the electron-dot structure of Methane.
b) Define Homologous series.
c) Write the IUPAC names of the following.
i) CH3 - CH2 - COOH
ii) CH3 - CHOH - CH3
iii) CH3 - CO - CH3 - CH3
ii) a) What is hypermetropia?
b) What are the possible reasons of hypermetropia?
c) How is hypermetropia corrected?
d) Explain with diagrams.
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