The following three objects (1) a metal tray, (2) a block of wood, and (3) a woolen cap are left in a closed room overnight. Next day the temperature of each is recorded as T1, T2 and T3 respectively. The likely situation is
option
(A) T1 = T2 = T3
(B) T3 > T2 > T1
(C) T3 = T2 > T1
(D) T3 > T2 = T1
MnO4
– oxidizes (i) oxalate ion in acidic medium at 333 K and and (ii) HCl. For balanced chemical
equations, the ratios [MnO4
– : C2O4
2–] in (i) and [MnO4
– : HCl] in (ii), respectively, are-
(A) 1 : 5 and 2 : 5 (B) 2 : 5 and 1 : 8 (C) 2 : 5 and 1 : 5 (D) 5 : 2 and 1 : 8
Let ABC be an equilateral triangle, let KLMN be a rectangle with K, L on BC, M on AC and N on AB.
Suppose AN/NB = 2 and the area of triangle BKN is 6. The area of the triangle ABC is-
(A) 54 (B) 108
(C) 48 (D) not determinable with the above data
In 1670, Robert Boyle conducted an experiment where in he placed a viper (a poisonous snake) in a chamber
and rapidly reduced the pressure in that chamber. Which of the following would be true ?
(A) Gas bubbles developed in the tissues of the snake
(B) The basal metabolic rate of the snake increased tremendously
(C) The venom of the snake was found to decrease in potency
(D) The venom of the snake was found to increase in potency
A solution containing 8.0 g of nicotine in 92 g of water freezes 0.925 degrees below the normal freezing
point of water. If the molal freezing point depression constant Kf = – 1.85ºC mol–1 then the molar mass of
nicotine is-
(A) 16 (B) 80 (C) 320 (D) 160
Consider the regions A = {(x, y) | x^2 + y^2 ≤ 100} and = {(x, y) | sin (x + y) > 0} in the plane. Then the area
of the region A ∩ B is-
(A) 10 π (B) 100 (C) 100 π (D) 50 π