1. A current through a wire-depends on time as i = ot + t 2. Where do = 20A/s and = 8As. Find the charge crossed through a section of the wire in 15s. (a) 2100C (b) 2250C (c) 260C (d) 11250C The work done by a gas molecule in an isolated system is given by W=ae akT, where x is the displacement, k is the Boltzmann constant and T is the temperature. a and are constants. Then the dimensions of will be: 3. (a) [MLT2] (b) [MLT-2] (c) [MLT] (d) [MLT] In the given figure, a mass M is attached to a horizontal spring which is fixed on one side to a rigid support. The spring constant of the spring is k. The mass oscillates on a frictionless surface with time period T and amplitude A. When the mass is in equilibrium position, as shown in the figure, another mass m is gently fixed upon it. New amplitude of oscillation will be: m M k M (a) A M-m 4. (b) A M M+m M-m M+m (c) A (d) A Mong the circur M Four identical particles of equal masses 1kg made to move along the circumference of a circle of radius 1m under the actin of their own mutual gravitational attraction. The speed of each particle will be: (1+22)G (a) 2 (b)(1+22) (c)(22-1) (d) G(1+22)