ECAT Physics Online Test With Answers

ECAT Physics Online Test

Sr. # Questions Answers Choice
1 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>
2 Internal friction of fluid is called Surface tension Viscosity Resistance Cohesive force
3 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
4 The pressure will be low where the speed of the fluid is Zero High Low Constant
5 Blood has a density Equal to water Greater then water Lesser then water None of these
6 According to Stoke's law, drag force depends on Initial velocity Final velocity Terminal velocity Instantaneous velocity
7 Ball pen functions on the principle of Viscosity Boyle's law Gravitational force Surface tnesion
8 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
9 Surface tension of water is due to Inter molecular attractions Inter molecular spaces Inter molecular repulsion None of above
10 Bernoulli's equation is based upon law of conversation Mass Momentum Energy None of these
11 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>
12 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
13 A body whose momentum is constant must have constant Acceleration Velocity Force None of these
14 Swimming is based on the principle of Newton's 1st law Newton's 2nd law Newton's 3rd law All
15 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
16 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
17 When a body is moving on a surface, the force of friction is called Static friction Dynamic friction Limiting friction Rolling friction
18 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
19 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
20 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
21 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
22 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
23 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
24 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
25 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
26 Unit of impulse in Newton Kg m Kg m/s Joule
27 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
28 A cold soft drink is kept on the balance. When the cap is opened, then the weight Increases Decreases First increases, then decreases Remains same
29 When a bicycle is in motion but not pedaled, the force of friction exerted by the ground on the two wheels is such that it acts In the backward direction on the front wheel and in the forward direction on the rear wheel In the forwards directions on the front wheel and in the backward direction on the rear wheel In the forward direction on both the wheels In the backward direction on both the wheels
30 An aircraft is moving with a velocity of 300 ms-1. If all the forces acting on it are balanced, then It still moves with the same velocity It will be just floating at the same point in space It will be fall down instantaneously It will lose its velocity gradually
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