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March 2015 Science and Technology Board Paper with Solution

March 2015 Science and Technology Board Paper with Solution

1. A. a. Read the following statements with suitable words in the blanks:

i. The device used for producing electric current is called a ________________ (Electric Generator)
ii. ____________ the second layer of the atmosphere reaches 48 km above the earth’s surface. (Stratosphere)

b. Rewrite the following table so as to match the second column with the first column:

Column A
column B
i. eosin
1. losing hydrogen
ii. oxidation
2. synthetic indicator

3. losing oxygen

4. natural indicator

c. Give the molecular formula of bleaching powder.
Ans. CaOCl2
(B) Rewrite the following statements by selecting the correct options:
1. When phenolphthalein is added to NaOH, the colour of the solution will become _______ (pink)
a. colourless
b. red
c. pink
d. yellow

2. If the potential difference across the ends of a conductor is 220 V and the resistance of the conductor is 44 Ω (ohm), then the current flowing through is _______________(5 A)
a. 0.2 A
b. 0.5 A
c. 2 A
d. 5 A

3. 1 A = ______________ mA (10-3 )
a. 102
b. 103
c. 10-3
d. 10-6

4.  The distance between principal focus and optical centre of the lens is ______________  (Focal length)
a. diameter
b. focal length
c. principal axis
d. optical centre

5. When rays of light are incident on a glass slab, then the incident ray and emergent ray are __________ to each other.  (parallel)
a. perpendicular
b. parallel
c. opposite
d. concurrent.

Section B
5. A. a. Find the correlation in the given pair and rewrite the answer:

1. Tinning : Tin Galvanizing: ______________ (iron)
2. Mammals: _______________ Amphibia : Fishes (Reptiles)

b. State True or False:
1. Solar water – heater works on renewable energy system. (True)
2. In human beings the blood goes to the heart in one cycle once. (False)
3. In frog, thyroid secretion stimulates the metamorphosis from tadpole to adult frog. (True)

(B) Rewrite the following statements by selecting the correct options:

1. The molecular formula of acetic acid is ______________ [CH3COOH]
a. CH3COOH
b. CH3 – CH3
c. C6H6
d. C2H4

2. Carbon dioxide enters into the leaves through tiny pores present on the surface of the leaf called ________ [stomata]
a. chlorophyll
b. chloroplast
c. stomata
d. epidermis

3. _________________ is the solution in blue in colour.  (CuSO4)
a. CuSO4
b. FeSO4
c. ZnSO4
d. Al2(SO4­­­)3

4. Yeast reproduced by _______________ (budding)
a. Spore formation
b. multiple fission
c. fragmentation
d. budding

5. Raisins put in water absorb water by the process of ____________ (osmosis)
a. diffusion
b. osmosis
c. transpiration
d. excretion

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2019 Board Paper Solution

HSC ENGLISH SET A 2019 21st February, 2019

HSC ENGLISH SET B 2019 21st February, 2019

HSC ENGLISH SET C 2019 21st February, 2019

HSC ENGLISH SET D 2019 21st February, 2019

SECRETARIAL PRACTICE (S.P) 2019 25th February, 2019

HSC XII PHYSICS 2019 25th February, 2019

CHEMISTRY XII HSC SOLUTION 27th, February, 2019

OCM PAPER SOLUTION 2019 27th, February, 2019

HSC MATHS PAPER SOLUTION COMMERCE, 2nd March, 2019

HSC MATHS PAPER SOLUTION SCIENCE 2nd, March, 2019

SSC ENGLISH STD 10 5TH MARCH, 2019.

HSC XII ACCOUNTS 2019 6th March, 2019

HSC XII BIOLOGY 2019 6TH March, 2019

HSC XII ECONOMICS 9Th March 2019

SSC Maths I March 2019 Solution 10th Standard11th, March, 2019

SSC MATHS II MARCH 2019 SOLUTION 10TH STD.13th March, 2019

SSC SCIENCE I MARCH 2019 SOLUTION 10TH STD. 15th March, 2019.

SSC SCIENCE II MARCH 2019 SOLUTION 10TH STD. 18th March, 2019.

SSC SOCIAL SCIENCE I MARCH 2019 SOLUTION20th March, 2019

SSC SOCIAL SCIENCE II MARCH 2019 SOLUTION, 22nd March, 2019

XII CBSE - BOARD - MARCH - 2019 ENGLISH - QP + SOLUTIONS, 2nd March, 2019

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