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Specimen copy of Resonance Distance Learning program for IJSO Plus. Visit @ www.edushoppee.com to purchase.Full description
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IJSO QUESTION WITHANSWER (8-11-10) 1.
Sol.
If least prime factor of a number m is 3 and least prime factor of another number n is 7, then least prime factor of the number (m + n) is : (A*) 2 (B) 3 (C) 5 (D) 7 Least prime factor of number m is 3 and least prime factor of another number n is 7. Therefore both m, n are odd numbers because they donot have two as factor. So, when they are added we get an even eve n number. So, least prime factor of the number (m + n) is 2.
2.
A spring balance together with a suspended weight of 2.5 kg is dropped from a height of 30 metres. The reading on the spring balance, while falling, will be :
3.
(A) 2.5 kg
(B) 1.25 kg
(C*) 0 kg
(D) 25 kg
Removal of a hydride ion from methane molecule gives
Sol.
(A) methyl group.
(B) me methyl radical.
(C*) ca carbocation.
(D) ca carbanion.
When hydrogen atom of methane molecule leaves with the bond pair of electrons, the carbonatom acquires a positive charge. Thus, a methyl carbocation is formed.
4.
The term used for abnormal rise in RBC s count is (A) (A) ery erythro throcy cyto tope peni nia a (B) (B) hema hemato toly lysi sis s ’