Wipro placement Paper Latest 2007 Dec

1. An electron moving in an electromagnetic field moves in a
(a) In a straight path (b) Along the same plane in the direction of its propagation(c) Opposite to the original direction of propagation(d) In a sine wave
Ans. (b)
2. The total work done on the particle is equal to the change in its kinetic energy
(a) Always(b) Only if the forces acting on the body are conservative.(c) Only if the forces acting on the body are gravitational.(d) Only if the forces acting on the body are elastic.
Ans. (a)
3. The following unit measure energy:
(a) Kilo-watt hour.(b) Volt*volt/sec*ohm.(c) Pascal*foot*foot(d) (Coulomb*coulomb)*farad
Ans. (a)
4. Astronauts in stable orbits around the earth are in a state of weightlessness because
(a) There is no gravitational force acting on them.(b) The satellite and the air inside it have an acceleration equal to that of gravitational acceleration there.(c) The gravitational force of the earth and the sun balance giving null resultant.(d) There is no atmosphere at the height at which the satellites move.
Ans. (b)
5. An organ pipe, open at both ends and another organ pipe closed at one end, will resonate with each other, if their lengths are in the ratio of
(a) 1:1(b) 1:4(c) 2:1(d) 1:2
Ans. (c)