Maharashtra SSC Class 10 Science and Technology I March 2019 question paper with answers

Q.1 (A)

1 mark each

Q.1 (A) (1)1 mark $m_1$
Q.1 (A) (2)1 mark $In the Dobereiner's triad Li, Na, K, the atomic masses of lithium and potassium are 6.9 and 39.1 respectively. What will be the atomic mass of sodium?$
Q.1 (A) (3)1 mark $State whether the given statement is true or false: A concave lens is a converging lens.$
Q.1 (A) (4)1 mark $By considering the first correlation, complete the second correlation: Hubble telescope : 569 km high from earth surface :: Revolving orbit of Hubble telescope : ____$
Q.1 (A) (5)1 mark $Find the odd man out: Tinning, Anodization, Alloying, Froth flotation.$

1 mark each

Q.1 (B) (1)1 mark $The reaction of iron nail with copper sulphate solution is ________ reaction.$
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Q.1 (B) (2)1 mark $R_1$
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Q.1 (B) (3)1 mark $50^\circ$
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Q.1 (B) (4)1 mark $^\circ C$
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Q.1 (B) (5)1 mark $The carbon compound used in daily life is ________.$
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2 marks each · attempt any 5

Q.2 (1)2 marks $Two tungsten bulbs of power 50 W and 60 W work on 220 V potential difference. If they are connected in parallel, how much current will flow in the main conductor?$
Q.2 (2)2 marks $Give scientific reason: In electric equipment producing heat, e.g. iron, electric heater, boiler, toaster etc., an alloy such as Nichrome is used, not pure metals.$
Q.2 (3)2 marks $(g = 9.8\ \text{m/s}^2)$
Q.2 (4)2 marks $Write the names of the first four members of the homologous series of alcohols.$
Q.2 (5)2 marks $F_1$
Q.2 (6)2 marks $Out of sodium and sulphur, which is a metal? Explain its reaction with oxygen.$
A tapping vessel opens in a tank-like container that is tapering on the lower side. The tank has an outlet for water on the upper side and a water inlet on the lower side. Finely ground ore is released in the tank. A forceful jet of water is introduced in the tank from the lower side and gangue particles and pure ore are separated by this method.
Q.2 (7) (i)2 marks $The above description is of which gravity (gravitation) separation method?$
Q.2 (7) (ii) $Draw a labelled diagram of this method.$

3 marks each · attempt any 5

Q.3 (1)3 marks $What would be the value of 'g' on the surface of the earth if its mass were twice and its radius half of what it is now?$
Q.3 (2)3 marks $Write the merits of Mendeleev's periodic table.$
Study the following chemical reaction and answer the questions given below: $\mathrm{AgNO_{3(aq)} + NaCl_{(aq)} \rightarrow AgCl_{(s)}\!\downarrow + NaNO_{3(aq)}}$
Q.3 (3) (i)3 marks $Identify and write the type of chemical reaction.$
Q.3 (3) (ii) $Write the definition of the above type of chemical reaction.$
Q.3 (3) (iii) $Write the names of the reactants and products of the above reaction.$
Q.3 (4)3 marks $Explain the given temperature vs time graph (with points A, B, C, D) showing the changes occurring when a mixture of ice and water is heated.$
Surabhi from Std. X uses spectacles. The power of the lenses in her spectacles is 0.5 D. Answer the following questions from the given information.
Q.3 (5) (i)3 marks $Identify the type of lenses used in her spectacles.$
Q.3 (5) (ii) $Identify the defect of vision Surabhi is suffering from.$
Q.3 (5) (iii) $Find the focal length of the lenses used in her spectacles.$
Q.3 (6)3 marks $\mathrm{CH_2{=}CH_2}$
Q.3 (7)3 marks $What is meant by space debris? Why is there a need to manage the debris?$

Sr. No.	Common Name	Structural Formula	IUPAC Name
1.	Ethylene	$\mathrm{CH_2{=}CH_2}$	?
2.	?	$\mathrm{CH_3COOH}$	Ethanoic acid
3.	Methyl alcohol	?	Methanol

5 marks each · attempt any 1

Taking into consideration the period of the elements given below, answer the following questions:
Elements Atomic Radius (pm)
O 66
B 88
C 77
N 74
Be 111
Li 152
Q.4 (1) (i)5 marks $Arrange the above elements in a decreasing order of their atomic radii.$
Q.4 (1) (ii) $State the period to which the above elements belong.$
Q.4 (1) (iii) $Why is this arrangement of elements similar to the above period of the modern periodic table?$
Q.4 (1) (iv) $Which of the above elements have the biggest and the smallest atom?$
Q.4 (1) (v) $What is the periodic trend observed in the variation of atomic radius while going from left to right within a period?$
Observations made by Swarali while doing experiments are given below. Based on these, write answers to the questions: Swarali found that a light ray travelling from a denser medium to a rarer medium goes away from the normal. If the angle of incidence (i) is raised by Swarali, the angle of refraction (r) went on increasing. However, after a certain value of the angle of incidence, the light ray is seen to return back into the denser medium.
Q.4 (2) (i)5 marks $\angle i$
Q.4 (2) (ii) $What is the process of reflection of the incident ray back into the denser medium called?$
Q.4 (2) (iii) $Draw the diagrams of the three observations made by Swarali.$