Science and Technology SEE 2082, Karnali Province question paper

(a) Which of the following of signal's can be coded? i) Analogue ii) Baseband iii) Digital iv) Broadband

(b) Which of the following is correct about sex determination of embryo? i) Embryo will develop into a male because of X chromosome. ii) Embryo will develop into a male because of Y-chromosome. iii) Gender cannot be determined on the basis of X chromosome. iv) Embryo will develop into a female because of Y-chromosome.

(c) Which of the following pairs is correct?

i) a-iii, b-i, c-ii ii) a-ii, b-iii, c-i iii) a-ii, b-i, c-iii iv) a-iii, b-ii, c-i

(d) If a stone is dropped from the top of the tower having height 22.05 m, how long does it take to reach the ground? i) 1 second ii) 1.5 second iii) 2 second iv) 2.5 second

(e) $W_1$, $W_2$ and $W_3$ are the weights of an object on weighing by a spring balance in air, water and oil respectively. What is the correct ascending order of given weights? i) $W_2<W_3<W_1$ ii) $W_1<W_2<W_3$ iii) $W_3<W_2<W_1$ iv) $W_2<W_1<W_3$

(f) Which of the following is the characteristics of the image of the object kept in front of the convex lens as shown in the figure. [figure in the original paper] i) The image is virtual, and magnified ii) The image is virtual, inverted and diminished iii) The image is real, inverted and diminished iv) The image is real and magnified

(g) Which of the following is the source of Alternating current? i) dry cell ii) solar panel iii) dynamo iv) voltaic cell

(h) Which of the following is correct about saturated hydrocarbon? i) Four bonds between carbon - carbon and general formula $C_n{H}_{2n+2}$ ii) carbon - carbon has double or triple bond and general formula $C_n{H}_{2n}$ iii) carbon - carbon has single bond and general formula $C_n{H}_{2n+2}$ iv) carbon - carbon has single and double bond and general formula $C_n{H}_{2n-2}$ (i) Which of the following is soap less soap? a) Sodium chloride b) Alkyl benzene sulphonate c) Sodium palmitate d) Sodium sulphate

Write very short answers of the following questions. a) Identify a dependent variable in Ohm's law V=IR. b) Write a function of RBC. c) Write any one measure to conserve rare birds in Nepal. d) On which principle does Hydraulic brake work? e) If Y is a metal, what is its valency in given product of the chemical equation? $2\mathrm{Y}+\mathrm{N}{}_2\to 2\mathrm{YN}$ f) Write a difference between roasting and calcination. g) Draw a labelled diagram to purify impure copper by electro refining process. h) IVF is a boon for childless couple, why? i) Although shampoo and detergents are better cleaning agents, they degrade our environment. Suggest one natural alternative of such chemical cleansers.