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IJSO QUESTION WITHANSWER (29-10-10) 1.
ABCD is a rectangle and lines DX, DY and XY are drawn as shown. Area of AXD is 5, Area of BXY is 4 and area of CYD is 3. If the area of DXY can be expressed as
2.
p where p
N then p is equal to X
A
A small object of mass m slides down a rough uneven hilly plane from a height h and stops after travelling a certain distance BC on a horizontal surface. surface . The work needed to be done to return the object to its initial position along the same path would be :
B Y C
D
(A) 72 (C*) 84 a
A
(B) 75 (D) 96 X x – a 4
Sol.
y
5
xy – 12 3
D
x
(C*) 2 mgh (D) Cannot be ascertained
Y b C
3.
Sol.
...(i)
xy – 12 = p =
84 p = 84.
84
(C) 1:1.
(D) 2:2.
In benzene,(C6H6) there are 12 sigma bonds and
4.
If all bacteria of intestine die, then what will be (A) Man will will feel tired tired all the body (B) It will cause blindness (C*) There will be no synthesis of vitamin -B Complex (D) Excretion will be effected
84
84 By compairing (i) & (ii)
(B) 2:1.
the effect on body:
24 2 84 2
12 – ab =
(A*) 4:1.
4:1.
24 576 – 240 2
= 12 –
The ratio of sigma and pi bonds in benzene benzene is-
3 pi bonds.Thus ratio of sigma and pi bonds is
10 6 × + ab = 24 a b a2b2 – 24ab + 60 = 0
=
(B) mgh
B y – b
ay = 10 xb = 6 (x – a)(y – b) = 8 xy – ay – bx + ab = 8 xy – 10 – 6 + ab = 8 xy + ab = 24 xy – 12 = 12 – ab xy + ab = 24