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ISJO QUESTION WITHANSWER (15-10-10)
1. Sol.
If x – y = 7 and x2 + 3xy – 4y2 = 14, the value of (x + y), is (A) 9 (B*) 5 (C) 6 x=7+y x2 + 3xy – 4y2 = 14 (7 + y)2 + 3(7 + y)y – 4y2 = 14 49 + y2 + 14y + 21y + 3y2 – 4y2 = 14 35y = – 35 y = – 1 x=6 x + y = 6 – 1 = 5
(D) 7
2.
A truck and a car moving m oving with the same K.E. are brought to rest res t by the application of brakes which provide equal retarding force. Which of them will come to rest in a shorter distance : (A) The truck (B) The car (C*) Both will travel same distance before coming to rest (D) The distance of travel will depend on the horse power of the vehicle
Sol.
Suppose mas of car is m and that of truck is M (m < M) retarding force is same and final velocityies and zero For Car v2 = u2 + 2as
u12 s1 = 2a1
........(i)
For Truck
u22 s2 = 2a2
........(ii)
But kinetic energy and same so,
or
1 1 mu12 = mu22 2 2 u12 u22
M m
From (1) and (2) s1 s2
u12
a2 a1
Here a
1 m
a1 So, a 2
M m
s1 s2
3.
u12
M m m M
s1 = s 2
Acid used for removing ink stains is (A) Acetic acid.
Sol.
(B*) Oxalic acid.
(C) Citric acid.
(D) Tartaric acid.
Oxalic aid is used for removing ink stains. other uses are in wood restorers where the acid dissolves away a layer of dry surface wood to expose fresh material underneath, as an additive to automotive wheel cleaners, etc.
4.
Match the columns. (a) (b) (c) (d) (d)
Columns I Erythrocytes Chondrocytes Osteocytes Schw Schwan ann n cel cells ls
p q r s t
Columns II B o ne Neuron Cartilage Blood Adipose tissue
(A) a – s, b – p, c – r, d – q (B) a – s, b – q, c – p, d – t (C*) a – s, b – r, c – p, d – q (D) a – s, b – r, c – t, d – p