Central Institute of Higher Tibetan Studies 2009 CBSE CLASS X - Question Paper

solenoid
?? For making an electromagnet ½
11. accurate Ray Diagrams ½+½
Concave lens/Correct ray diagram ½+½
12. (a) Reaction will take place because Zn is above Cu in the activity series
(b) Reaction will not take place as Fe is beneath Zn in the activity series and
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cannot displace Zn from its compounds.
(c) Reaction will take place as Zn is above Fe in the activity series. 1x3= 3
13. (a) (i) + 50cm, convex lens ½+½
(ii) - 25cm, concave lens
(b) (i) =
= +100cm, m = one ½+½ 3
(ii) =
= -20cm, m = ½+½
14. (a) E
(b) D
(c) B
(d) D, atomic radius reduces with greater nuclear charge in the identical
period 1x5= 5
(e) Noble Gases / Inert Gases
15. (i) Ethanoic Acid / Acetic Acid 1
(ii) CH3 COOH + C2 H5 OH ----> CH3 COOC2 H5 + H2O 1
(iii) Saponification
CH3 COO C2 H5 NaoH > C2 H5 OH + CH3 COOH ½+½= 1
(iv) CO2 gas 1
2 CH3 COOH + Na2 Co3 ----> two CH3 COO Na + H2O + CO2 1
OR
(a) Due to the property of Catenation. Carbon has unique property to form
bonds with other carbon atoms. 1
(b) Saturated compounds are those in which all the valencies of carbon
atoms are satisfied by single bond ranging from them.
In unsaturated compounds, the valency per carbon atom remains unsatisfied.
Thus there is a double bond or triple bond ranging from carbon atoms. 2
(c) Unsaturated hydrocarbon 1
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(d) (i) Bromoethane
(ii) Hexyne
16. (i) The appliances can be operated independently. ½
(ii) They get the identical applied voltage ½
The fuse will not blow off even if the current in these devices were to
exceed their safe current values. This could damage these devices
and even reason fire. 3
Any fuse of lower amperage needs to be put in the circuit 1
OR
(i) I : Direct current ; I I : Alternating current 1
(ii) I : Dry cell ; I I : Alternating current generator 1
(iii) I : Zero ;I I : 50 cycles per 2nd 1
(iv) I : Direction remains constant and value of current remains identical. 1

Earning:   Approval pending.