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
A bust cell has intracellular bacteria symbionts. If the growth rate of the bacterial symbiont is always 10%
higher than that of the host cell, after 10 generations of the host cell the density of bacteria in host cells will
increase -
(A) by 10 % (B) two-fold (C) ten-fold (D) hundred-fold
Selection of lysine auxotroph (bacteria which requires lysine for growth) from a mixed population of bacteria
can be done by growing the bacterial population in the presence of-
(A) lysine (B) penicillin (C) lysine and penicillin (D) glucose
If a man with an X-linked dominant disease has six sons with a woman having a normal complement of
genes, then the sons will
(A) not show any symptoms of the disease
(B) show strong symptoms of the disease
(C) three will show a disease symptom, while three will not
(D) five will show a disease symptom, while one will not
Two friends A and B are 30 km apart and they start simultaneously on motorcycles to meet each other. The speed of A is 3 times that of B. The distance between them decreases at the rate of 2 km per minute. Ten minutes after they start, A's vehicle breaks down and A stops and waits for B to arrive. After how much time (in minutes) A started riding, does B meet A?
option
(A) 15
(B) 20
(C) 25
(D) 30
If you compare adults of two herbivore species of different sizes, but from the same geographical area, the
amount of faeces produced per kg body weight would be-
(A) More in the smaller one than the larger one
(B) More in the larger one than the smaller one
(C) Roughly the same amount in both
(D) Not possible to predict which would be more
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