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#3
12th July 2018, 12:23 PM
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| Re: SCRA previous paper
The SCRa is conducted by UPSC. But from last year the UPSC does not plan for SCRA exam. Special Class Railway Apprentices exam by UPSC for the 12th passed or graduates degree is being organized every year. UPSC SCRA exam is being given by large number of candidates every year. The examination is organized to choose the candidates for the mechanical department in railways. SCRA Exam has to be prepared in the very proper manner so that the candidates can read all the sections that can come in the exam. Here is PDF for Special Class Railway Apprentices previous paper: Special Class Railway Apprentices previous paper     Special Class Railway Apprentices previous paper: A simple of mass m is at x=0 and moving along the x axis with velocity V0, at time t=0. it is subjected to a frictional force -bvx where b is a constant. and vx is the velocity in the x-direction. At what position x on the x-axis will it come to rest ? (a) x=bv (b) x=bv/m (c) x=mbv (d) x=mv/b A body B of mass m moving forward with velocity v along the x-axis, collides elastically with a stationary object C of mass 2m at the origin. After the collision, body B moves backward along the x-axis. Given that the kinetic energy of the system is conserved. what is the speed of the object C after the collistion ? (a) 2v/3 (b) v/2 (c) v/3 (d) 3v/4 A body is moved along a straight line by a machine delivering constant power. The distance moved by the body in time t is proportional to (a) t 1/2 (b) t 3/4 (c) t 3/2 (d) t2 A body of mass 3 kg is under a force which causes displacement in it, given by s=t2/3 in meter, with time t in second. what is the work done by the force between time t=0 and t=2 ? (a) 8 J (b) 5.2 J (c) 3.9 J (d) 2.6 j . What is the lateral displacement of a ray of light passing through a parrllel plate of glass of thickness t with angles of incidence and refraction respectively as α and β ? (a) t sec (α/β) (b) t sin(α-β) sec β (c) t sin (α-β) (d) t cos (α-β) cosec β . A spacesship is a launched into a cirular orbit close to the Earth's surface. Waht additional velocity has to be imparted to the spaceship to overcome the gravitational pull ? (radius of the Earth is R) (a) gR (b) √2 gR (c) (√-1) √gR (d) (√2-1) gR What is the trajectory of a particles if it moves according to the kaw x=a sin(ωt) and y=a cos(2ωt) ? (a) Circle (b) Parabola (c) Hyperbola (d) Elipse The velocity of a particle moving in the positive direction of x-axis varies as v=α√x where α is a positive constant. Assuming t=0, the particle is at x=0. Waht is the time dependence on displacement ? (a) t=2x/α (b) t=2√x/α (c) t=2√x/√α (d) t=√2x/√α A Particle of mass m moves in a borizontal circle of radius r under the influence of a centripetal force given by-kr-2, where k is a constant. What is the energy of the particle ? (a) k/r (b) -k/(2r) (c) k/(2r) (d) -k/r |