ECAT Physics Online Test With Answers

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ECAT Physics Online Test

Sr. # Questions Answers Choice
1 A lift is descending at a constant speed V. A passenger in the lift drops a coin. The acceleration of the coin towards the floor will be Zero g -g V + g
2 A vehicle of mass 120 kg is moving with a uniform velocity of 108 km/h. The force required to stop the vehicle in 10s is 120 x 10.8 N 180 N 720 N 360 N
3 Essential characteristic of equilibrium is Momentum equal to zero Acceleration equal to zero Kinetic energy equal to zero Velocity equal to zero
4 If a car rest acceleration uniformly to a speed of 144 km/h in 20 s it covers a distance of 20 m 400 m 1440 m 2880 m
5 A ball falls on the surface from 10 m height and rebounds to 2.5 m. if the duration of contact with the floor is 0.01 seconds then the average acceleration during contact is 2100 m/s<sup>2</sup> 1400 m/s<sup>2</sup> 700 m/s<sup>2</sup> 400 m/s<sup>2</sup>
6 By which velocity a ball be projected vertically so that the distance covered by it in 5th seconds is twice the distance it covers in its 6th second ( g=10m/s2) 58.8 m/s 49 m/s 65 m/s 19.6 m/s
7 A 120 m long train is moving in a direction with speed 20 m/s. A train B moving with 30 m/s in the opposite direction and 130 m long crosses the first train in a time 6 s 36 s 38 s None of these
8 A ball of mass m moving with uniform speed collides elastically with another stationary ball. The incident ball will lose maximum kinetic energy when mass of the stationary ball is m 2 m 4 m Infinity
9 A car moves for half of its time at 80 km/h and rest half of time at 40 km/h, The total distance covered is 60 km. What is the average speed of the car? 60 km/hr 80 km/hr 120 km/hr 180 km/hr
10 An airplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically above a point A on the ground, a bomb is released from it. The bomb strikes the ground, at point B. The distance AB is 1200 m 0.33 km 3.33 km 33 km
11 For a moving body, at any instant of time If the body is not moving the acceleration is necessarily zero If the body is slowing, the retardation is negative If the body is slowing, the distance is negative If displacement, velocity and acceleration at that instant are known, we can find the displacement at any given time in future
12 A body walks to his school at a distance of 6 km with a speed of 2.5 km/h and walks back with a constant speed of 5 km/h. His average speed for round trip expressed in km/h is 24/13 10/3 3 4,8
13 A ball is thrown upwards with a velocity of 100 m/s. It will reach the ground after 10 s 20 s 5 s 40 s
14 At the top of the trajectory of a projectile the acceleration is The maximum The minimum Zero g
15 Which of the following four statements is false? A body can have zero velocity and still be accelerated A body can have a constant velocity and still have a varying speed A body can have a constant speed and still have a varying velocity The direction of the velocity of a body can change when its acceleration is constant
16 A body is dropped from a tower with zero velocity, reaches ground in 4s. The height of the tower is about 80 m 20 m 160 m 40 m
17 What will be the ratio of the distance moved by a freely falling body from rest in 4th and 5th seconds of journey? 4 : 5 7 : 9 16 : 25 1 : 1
18 A train of 150 m length is going towards north direction at a speed of 10 ms-1. A parrot files at a speed of 5 ms-1towards south direction parallel to the railway track. The time taken by the parrot to cross the train is equal to 12 s 8 s 15 s 10 s
19 The sum of the magnitude of two forces acting at a point is 18 and the magnitude of their resultant is 12. If the resultant is at 90° with the force of the smaller magnitude, then their magnitudes are 3, 15 4, 14 5, 13 6, 12
20 A motorist travels A to B at a speed at 40 km/h and returns at speed of 60km/h. His average speed will be 40 km/h 48 km/h 50 km/h 60 km/h
21 In velocity of a particle at an instant is 10 m/s and after 5s the velocity of the particle is 20 m/s. The velocity 3s before in m/s is 8 4 6 7
22 To get a resultant displacement of 10 m, two displacement vectors of magnitude 6 m and 8 m should be combined Parallel Antiparallel At angle 60<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> Perpendicular to each other
23 In Bernoulli's theorem the relation between velocity and pressure is Inverse Direct None of the above Both a and b
24 In the case of an incompressible fluid in stead flow the net rate of flow of mass entering one end of the tube of flow is equal to the net rate of flow of mass leaving the other end. This equation is called Quadratic equation Equation of discontinuity Equation of continuity None of the above
25 The smooth or steady stream-line flow is know as Laminar flow Turbulent flow Both a and b None of the above
26 With the increase of temperature viscosity Increase Decrease Remains same Doubles
27 A P-N juction or semiconductor diode cannot be used as A rectifier Detector Oscillator An amplifier
28 The substances whose resistance decreases with the increase in temperature these substances have coefficient of positive temperature negative temperature absolute temperature zero temperature
29 In the phenomenon of hysteresis magnetism leads the magnetising current magnetism lags behind the magnetising current meganetism goes along the magnetising current none of them
30 The curie temperature of iron is about 250<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span> 500<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span> 750<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span> 1000<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span>
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