IJSO Solutions 22-10-10

IJSO QUESTION WITHANSWER (22-10-10) 1.

Sol.

Given 2y cos  = x sin  and 2x sec   – y cosec  = 3, then the value of x2 + 4y2 is equal to (A) 1 (B) 2 (C) 3 (D*) 4 2x y =3  – cos  sin 

(B)

0

(C)

...(i) ...(ii)

0

(D*)

0 3.

ºC

ºF

ºC ºF

ºF

ºC

0

ºF

In esterification reaction, concentrated sulphuric acid acts as a (A*) dehydrating agent. (B) hydrating agent. (C) reducing agent. (D) hydrolysing agent.

Sol.

or light reaction of photosynthesis occur as a component of which cell organelle.

(C) Golgi apparatus

Which graph represents correct curve between ºC along y-axis and ºF along x-axis :

ºC

sunlight energy converted con verted in to ATP ATP & NADPH2

(B*) Chloroplasts

y = sin put y = sin in (ii) 2ycos = xsin 2×sincos = xsin x = 2cos x2 + 4y2= 4cos2 + 4sin2 =4

(A)

Thylakoids is membranous structure in which

(A) Mitochondria

2 x sin  – y cos  =3 cos  sin  2xsin  – ycos = 3cossin xsin  – 2ycos = 0 (ii) × 2, then (i)  – (ii)

2.

4.

Esters are most commonly formed by reaction of an acid and an alcohol.

(D) Endoplasmic reticulum