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

( C p Cv ) of a diatomic gas at room temperature is

(A) 5/2
(B) 7/5
(C) 7/2
(D) 5/3
78. The radii of curvature of a biconvex lens are 24 cm every. If the refractive index of the material of the lens is 1.6, the focal length of the length is
(A) 20 cm (B) zero (C) 7.5 cm (D) 12 cm
79. Total internal reflection occurs when
(A) Light enters a rarer medium from a denser medium and the angle of incidence is more than the critical angle.
(B) Light enters a denser medium from a rarer medium and the angle of incidence is
more than the critical angle.
(C) Light enters a rarer medium from a denser medium and the angle of incidence is less than the critical angle.
(D) Light enters a denser medium from a rarer medium and the angle of incidence is less than the critical angle.
80. A uniform solid sphere of a conducting material is provided a charge +Q. Which of the subsequent statements is FALSE?
(A) No work needs to be done to move a unit positive charge on the surface of the
sphere.
(B) Electrostatic potential at the centre of the sphere is zero. (C) Electric field at the centre of the sphere is zero.
(D) Electric field is zero everywhere inside the sphere.
81. A solid block of a material floats in water (density of water = one g/cm3) with 60 % of its quantity submerged in water. If it floats in an oil with 90 % of its quantity submerged, the
density of the oil is (A) 0.67 g/cm3 (B) 0.50 g/cm3 (C) 1.50 g/cm3 (D) 1.00 g/cm3

82. 2 infinitely long straight wires carrying steady currents I1 and I2 in the identical direction are kept parallel to every other, with a distance of separation d ranging from them. Then,
(A) There is no force ranging from the wires.
(B) There is a repulsive force ranging from the wires.
(C) There is a force parallel to the wires, ranging from them. (D) There is a force of attraction ranging from the wires.

83. If the points (x, 0.1), (2, 3) and (4, 5) are collinear, then the value of x is
(A) –1.1 (B) –0.9 (C) 0.9 (D) 1.1

84. Let

a ? i ? j ? k

and

b ? i ? two j ? 3k

Earning:   Approval pending.