SSC Board Exam 2024 Sci Tech 1 Que Ans ~ DNYANYATRI TANTRASNEHI

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SSC Board Exam 2024 Sci Tech 1 Que Ans

SSC Board Exam 2024 Sci Tech 1 Queestion Answer

2024 III 18 1100-N 640-SCIENCE AND TECHNOLOGY (72) - PART I (E)

(REVISED COURSE)

Time: 2 Hours

Max. Marks: 40

(Pages 12)

Note: (i) All questions are compulsory.

(ii) Use of a calculator is not allowed.

(iii) The numbers to the right of the questions indicate full marks

(iv) In case of MCQs [Q. No. 1(A)] only the first attempt will be evaluated and will be given credit.

(v) Scientifically correct, labeled diagrams should be drawn wherever necessary.

1. (A) Write the correct alternative:

(i) The SI unit of heat is

(A) Calorie

(B) Joule

(D) Cal/g °C

(ii) We can see the sun even when it is little below the horizor because of

(A) Reflection of light

(B) Refraction of light

(D) Absorption of light

(iii) is the functional group of carboxylic acid

(A) -COOH

(B) -CO-

(D) –OH

(iv) In simple microscope lens is used.

(A) Concave

(B) Plano concave

(D) Convex

(υ) In metals. process a layer of molten tin is deposited on

(A) Anodization

(B) Tinning

(D) Alloying

(B) Answer the following:

(i) Write the name of the atom having the smallest size.

(ii) Write the molecular formula of calcium carbonate.

(ii) Write the use of 'Calorimeter'.

(iv)Identify the hydrocarbon from the given electron-dot structure:

H H

-- --

H : C : C : H

.. ..

H H

(0) Match the Columns:

Column 'A' Column 'B'

Refractive index (a) 1.31

of water (b) 1.36

2. 4 (A) Give scientific reasons (any two):

(i) When the gas formed on heating limestone, is passed through freshly prepared lime water, the lime water turns milky.

(ii) Tungsten metal is used to make a solenoid type coil in an electric bulb.

(iii) On exposure to air, silver articles turn blackish after some time.

(B) Answer the following (any three): 6

(1) State Dobereiner's law of triad. Give one example of it.

(2) Identify the figure and explain its use:

(iii) What is meant by satellite launch vehicle? Name any one Indian satellite launch vehicle.

(iv) What is free fall? When is it possible ?

(2) The focal length of a convex lens is 20 cm. What is its power ?

3. Answer the following (any five):

(6) Select the appropriate options and complete the following 15

paragraph:

(Metals, non-metals, metalloids, four, sevon, s-block, p-block, d-block, /-block).

On the basis of electronic configuration, elements in the modern periodie table are classified into ------------------------------ blocks Groups 1 and 2 elements are included ------------------------ n and all these olements are metals. (except Hydrogen). Group 13 to 18 elements are included in This block contains metais, non-metals and metalloids. Group 3 to 12 elements are included in ------------------------------ and all the elements are..... ...............elements shown at the bottom of the periodic table i.e. Lanthanides and Actinidos constitute ------------------------- and all these elements are metals.

() (2) What are the factors affecting the rate of chemical reaction ?

(b) Explain any one factor.

(ii) Observe the following graph and answer the following questions:

(৫)What does the graph represent?

(b) What does the line AB represent?

Figure -> Points ->
(α) Name of the dofect	---------------------	-----------------------
(b) Position of the image	---------------------	-----------------------
(c) Write any three general properties of ionic compounds	---------------------	-----------------------