Indian Institute of Information Technology 2006 Entrance Exams IIT Entrance Exams JAM BIOTECHNOLOGY TEST - Question Paper

(A) 1:2 (B) 1:4 (C) 2:1 (D) 4:1
70. 4 equal resistances are connected in such a way that they form a square loop. If the value of every resistance is R, the resistance ranging from any 2 diagonally opposite points will be
(A) 2R
(B) R
2 2
(C) R
4
(D) R
71. 1 kilogram of cotton and 1 kilogram of iron have the identical weight. If they are placed
on an equal-arm balance kept in air, which of the subsequent statements is TRUE? (A) Both the arms will be at the identical level.
(B) The arm with the cotton will be at the lower level. (C) The arm with the iron will be at the lower level. (D) The arms keep oscillating.
72. A radioactive material containing N0 number of nuclei at time t=0 decays with a decay constant ?. The number of nuclei that will undergo decay in time t is

(A)

(B)

N e ?t
N e- ?t


(C)

N ?1 - e - ?t ?

(D)

N 0 ?t

73. An alternating current

I ? I 0 sin ?t , where ? is the angular frequency, is passed through a

resistor whose resistance is R. The thermal energy developed in the resistor during 1 time period (T) of the alternating current is

(A)

I two RT


(B)

I two RT
4

(C) zero
2


(D)

I 0 RT
2

74. Impurity energy levels in the case of an n-type semiconductor are situated
(A) Just above the top of the valence band.
(B) Just beneath the bottom of the conduction band.
(C) Exactly at the middle of the gap ranging from the valence and conduction bands. (D) Within the conduction band.

75. The separation ranging from the slits in the Young’s double slit apparatus is 0.1 mm. If the wavelength of light used is 500 nm, the separation ranging from the successive bright fringes of the interference trend found on a screen kept at a distance of one m from the slits is (A) 50 mm
(B) 10 mm (C) 5 mm (D) 2.5 mm
76. If the radii of orbits of 2 planets around the sun are in the ratio 1:4, their time periods of
revolution about the sun will be in the ratio
(A) 1:8 (B) 1:6 (C) 1:4 (D) 1:2
77. The ratio of the molar heat capacities at constant pressure and at constant quantity

Earning:   Approval pending.