IJSO Solutions 14-10-10

ISJO QUESTION WITHANSWER (14-10-10)

1.

ABC

is an isosceles right triangle tr iangle with area P. P. The radius of the circle that passes through the point A, B and C is (A*)

(B)

P

Sol.

P 2

(C)

P 2

(D)

2P

B a

a A

C

2a

Area of ABC = a=

1 2 a =P 2

2P

2 = 2r

2a×

2 p = 2r

2 P = 2r

r= P 2.

Water can be heated in a cup of paper because : (A) Paper is good conductor of heat (B) Paper has high specific heat (C*) Paper is thin (D) Paper is good radiator of heat

3.

Which of the following ion has the maximum magentic moment (A*) Mn2+.

Sol.

(B) Fe2+.

(C) Ti2+.

(D) Cr2+

No. of unpaired electron in Mn2+ = 5 No. of unpaired electron in Fe2+ = 4 No. of unpaired electron in Ti2+ = 2 No. of unpaired electron in Cr2+ = 4. Mn2+ contains maximum number of unpaired electrons, hence has maximum magnetic moment.

4.

Ligament connects (A) Muscle to skin

(B*) Bone to bone

(C) Muscle to muscle

(D) Muscle to bone