Physics ECAT Pre Engineering MCQ's Test For Full Book With Answers

Physics ECAT Pre Engineering MCQ's Test For Full Book

Sr. # Questions Answers Choice
1 Pressure exerted by a gas on the walls of its container in due to adhesion between the gas molecules and the container cohesion between the gas molecules and the container collision between the gas molecules and the container surface tension of the gas
2 A body is floating in a liquid. The up thrust on the body is Equal to weight of liquid displaced Zero Less than the weight of liquid displaced Weight of body-weight of liquid displaced
3 In a surface tension experiment with a capillary tube water rises up to 0.1 m. if the same experiment is repeated on an artificial satellite, which is resolving around the earth, water will rise in the capillary tube up to a height of 0.1 m 0.2 m 0.98 m Full length of the capillary tube
4 In a container having water filled up to a height h, a hole is made in the bottom. The velocity of water flowing out of the hole is Independent of h Proportional to h<sup>1/2</sup> Proportional to h Proportional to h<sup>2</sup>
5 Internal friction of fluid is called Surface tension Viscosity Resistance Cohesive force
6 At high altitude the blood oozes out of the nose and ear because The blood pressure increase at high altitudes The percentage of oxygen in the air increase The atmospheric pressure decrease there The density of blood decrease at high altitudes
7 The pressure will be low where the speed of the fluid is Zero High Low Constant
8 Blood has a density Equal to water Greater then water Lesser then water None of these
9 According to Stoke's law, drag force depends on Initial velocity Final velocity Terminal velocity Instantaneous velocity
10 Ball pen functions on the principle of Viscosity Boyle's law Gravitational force Surface tnesion
11 A person standing near the track of a fast moving train has tendency to fall towards it because of Vibration due to motion of train Gravitation force of attraction between person and trains The high speed of train Some other effect
12 Surface tension of water is due to Inter molecular attractions Inter molecular spaces Inter molecular repulsion None of above
13 Bernoulli's equation is based upon law of conversation Mass Momentum Energy None of these
14 The terminal velocity of a small size spherical body of radius R moving in a fluid varies as R R<sup>2</sup> 1/R (1/R)<sup>2</sup>
15 The velocity of falling raindrops attains limited value because of Up thrust of air Air currents of the earth atmosphere Surface tension effect Viscous force exerted by air
16 A body whose momentum is constant must have constant Acceleration Velocity Force None of these
17 Swimming is based on the principle of Newton's 1st law Newton's 2nd law Newton's 3rd law All
18 If rope of lift breaks suddenly. The tension exerted by the surface of lift is (a=Acceleration of lift) mg m (g+a) m (g - a) 0
19 A body of mass 1.0 kg is falling with an acceleration of 10 m/s2. Its apparent weight will be (g=10 m/s2) 1.0 kg wt 2.0 kg wt 0.5 kg wt Zero
20 When a body is moving on a surface, the force of friction is called Static friction Dynamic friction Limiting friction Rolling friction
21 A railway engine (mass 104kg) is moving with a speed of 73 km/h. The force which should be applied to bring it to rest over a distance of 20 m is 3,600 N 7,200 N 10,000 N 100,000 N
22 When a horse pulls a cart, the force that makes the horse run forward is the force exerted by The horse on the ground The horse on the cart The ground on the horse The ground on the cart
23 When a bicycle is in motion, the frictional forces exerted by the ground are In the forward direction on both the wheels In the backward direction on both the wheels In the forward direction on the front wheel and the backward direction on the rear wheel In the backward direction on the front wheel and the forward direction on the rear wheel
24 In an elevator moving vertically up with an acceleration 'g' the force exerted on the floor by a passenger of mass M is Mg 1/2 Mg Zero 2 Mg
25 Rocket engines lift a rocket from the earth surface, because hot gas with high velocity Push against the air React against the rocket and push it up Heat up the air which lifts the rocket Push against the earth
26 Two bodies of masses 1 kg and 5 kg are dropped gently form the top of a tower. A a point 20 cm from the ground both the bodies will have the same Momentum Kinetic energy Velocity Total energy
27 When the surfaces are coated with a lubricant, then they Stick to each other Slide upon each other Roll upon each other None of these
28 A force of 50 dynes is acted on a body of mass 5 g which is at rest, for an interval of 3 seconds, then impulse is 0.15 x 10<sup>-3</sup>Ns 0.98 x 10<sup>-3</sup>Ns 1.5 x 10<sup>-3</sup>Ns 2.5 x 10<sup>-3</sup>Ns
29 Unit of impulse in Newton Kg m Kg m/s Joule
30 A man fires a bullet of mass 200 g at a speed of 5 m/s. The gun is of one kg mass. By what velocity the gun rebounds backwards? 0.1 m/s 10 m/s 1 m/s 0.01 m/s
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