Solutions of IJSO Daily Practice Test- 3 (13-10-10)
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IJSO QUESTION WITHANSWER (2-11-10) 1.
Sol.
In the trapezium trape zium shown, AB II DC, and E and F are the midpoints of the two diagonals. If DC = 60 and EF = 5 then the length of AB is equal to :
(A) 40 (B) 45 (C*) 50 (D) 55 Given AB |||| CD and E & Fare the m id-point of AC and BD respectively. respec tively. So,
2.
EF =
1 (CD – AB) 2
AB = CD – 2EF AB = 60 – 2(5) AB = 50 cm.
If the earth shrinks, what will be the effect on the value of acceleration due to gravity g ? (A) It will decrease (B*) It will increase (C) It will become zero (D) It will become infinite
3.
Sol.
The most efficient fuel among the following is : (A*) methane.
(B) propane.
(C) butane.
(D) pentane.
Methane has the highest percentage of hydrogen. Hence, it burns to give maximum energy.
4.
Which step in blood clotting will not occur in absence of vitamin K ? (A) Conversion of fibrinogen to fibrin (B) Conversion of prothrombin to thrombin (C) Synthesis of thromboplastin (D*) Synthesis of prothrombin