ECAT Physics Online Test With Answers

image
image
image

ECAT Physics Online Test

Sr. # Questions Answers Choice
1 Distance covered by a freely falling body in 2 sec will be 4.9 m 19.6 m 29.2 m 44.1 m
2 The artillery shells travel along parabolic paths under the influence of magnetic field electric field electromagnetic field gravitational field
3 An object thrown in arbitrary direction in space with an initial velocity and moving freely under gravity will follow a circular path a straight line a hyperbola a parabola
4 The motion of a projectile is one dimension two dimension three dimension all of them
5 The motion in a plane is the motion in one dimension two dimension three dimension four dimension
6 The motion of a body in a straight line is the motion in one dimension two dimension three dimension four dimension
7 If m is the mass of the gases ejected per second with velocity v relative to the rocket of mass M, then the acceleration of rocket is a = M/mv a = mM/v a = mv/M a = v/mm
8 A rocket carries its own fuel in the form of liquid only liquid or solid liquid and solid liquid or solid and oxygen
9 A typical rocket consists of fuel more than 60% of launch mass less than 60% of launch mass less than 80% of launch mass more than 80% of launch mass
10 A typical rocket ejects the burnt gases at speeds over 400 ms<sup>-1</sup> 40000m s<sup>-1</sup> 40000 ms<sup>-1</sup> 60000 ms<sup>-1</sup>
11 A typical rocket consumes about 100 kg s<sup>-1</sup>of fuel 1000 kg s<sup>-1</sup>of fuel 10000 kg s<sup>-1</sup>of fuel 100000 kg s<sup>-1</sup>of fuel
12 Flight of rocket in the space is an example of Newton's first law Newton's third law Newton's second law all of them
13 When a shall explodes a mid-air, the total momentum of its fragments is less than the momentum of shell equal to the momentum of shell greater than the momentum of shell none of them
14 When a shell explodes in mid-air, its fragments fly off in only one direction in two direction different directions a particular direction
15 Suppose the water flows out from a pipe at 3kg s-1and its velocity changes from 5m s-1to zero on striking the wall, then the force exerted by water on wall will be 5 N 10 N 15 N 20 N
16 A snooker ball moving with velocity V collides head on with another snooker ball of same mass at rest. If the collision is elastic, the velocity of second snooker ball is Zero Infinity V 2 V
17 An alpha particle has a charge of +2e -2e -e +3e
18 When a nucleus emits an alpha particles, its charge number decreases by 3 2 6 5
19 When a nucleus emits an alpha particle, it atomic mass decreased by 2 1 4 3
20 Radioactivity is self disruptive activity spontaneous activity exhibited by all elements under proper conditions both 'a' and 'b'
21 Curie is a unit of reluctance resistivity binding energy radioactivity
22 Alfa , beta and gamma rays are emitted from a radio-active substance spontaneously when it is heated when it is exposed to light When it interacts with the other particle
23 Gamma rays consist of steam of electron proton photons all of these
24 Alfa particles are hydrogen nuclei helium nuclei electrons photons
25 Beta particles are hydrogen nuclei helium nuclei electrons photons
26 Maric Curie and Pieree Curie discovered two new radioactive elements, which are called polonium uranium uranium and radium polonium and radium none of these
27 Radioactivity was discovered by Rutherford Henri Becqureal Maxwell James Chadwick
28 Radioactivity is exhibited more by semiconductors in general in exhibited more by the element when they are coupled with other radioactive elements by a covalent bond is an atomic property of radioactive elements
29 Binding energy per nucleus is greater for heavy nucleus least for heavy nucleus greatest for light nuclei decreases for medium weight niclei
30 The amount of energy equivalent to 1 a.m.u is 9.315 Mev 93.15 Mev 931.5 Mev 2.22 Mev
Download This Set
×