ECAT Pre General Science Online Test With Answers

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ECAT Pre General Science Online Test

Sr. # Questions Answers Choice
1 When a body is vibrating, the displacement from mean position: Increases with time Decreases with time Changes with time None of these
2 The restoring force is ______ amd opposite to the applied force within _____: Equal, elastic limit Different, the walls of the laboratory Different, elastic limit None of these
3 The SI unit of spring constant is identical with that of: Force Surface tension Pressure Loudness
4 Which one of the following is an example of SHM: Motion in a plane Motion in a swing Motion in a car None of these
5 The unit of spring constant is: J-sec Metre Nm<sup>-1</sup> None of these
6 To and fro motion of a body is about its mean position is known as: Translatory motion Vibratory motion Rotatory motion None of these
7 If the waves produced in a microwave oven are of wave-length 12 cm, then their frequency will be: 2500 MHz 0.25 MHz 2500 KHz None of these
8 Free oscillations are always produced by: An applied force Gravitational force Restoring force and inertia Inertia only
9 An object undergoes SHM. Its maximum equilibrium positions: Maximum Half of its maximum value Zero None
10 Second's pendulum is the pendulum whose time period is: 1 second 2 second 3 second None of these
11 The string of a simple pendulum should be: Heavy Extensible In-extensible None of these
12 The time period of a simple pendulum is independent of its: Length Mass Value of g Both A and B
13 A body of mass 0.031 kg attached to one end of a spring of spring constant 0.3 N/m, then time period of spring mass system will be: 1.5 sec 2.0 sec 2.3 sec 2.5 sec
14 Distance covered during one vibration of an oscillating body in terms of amplitude A is: A 2 A 3 A 4 A
15 When quarter of a circle is completed, the phase of vibration is: 90<span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">°</span> 180<span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">°</span> 45<span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">°</span> 360<span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">°</span>
16 Angular velocity is a: Scalar quantity Vector quantity Complex quantity None of these
17 In rotational motion, analogue of force F us called: Couple Torque Mass Moment of intertia
18 The useful unit of angular replacement in SI unit is: Degree Revolution Radian Metre
19 Radian is defined as the angle subtended at the center of a circle by an arc of: Length equal to its diameter Length equal to its radius Any length None of these
20 A body moving along the circumference of a circle of radius R completes one revolution. The radius of the covered path to the angle subtended at the center is: Radius of the circle Twice the radius Thrice the radius None of these
21 A flywheel accelerates from rest to an angular velocity of 7 rad/sec in 7 seconds. Its average acceleration will be: 49 rad/sec<sup>2</sup> 1 rad/sec<sup>2</sup> 0.16 rev/sec<sup>2</sup> Both A and C Both B and C
22 A car is turning around a corner at 10 m/sec as it travels along an arc of circle. If value of centripetal acceleration is 10 m/sec2in this case, find radius of the circular path: 1 m 5 m 10 m 15 m
23 A 1000 Kg car travelling with a speed of 90 km/hr turns around a curve of radius 0.1 km. The necessary centripetal force comes out to be: 8.1 X 10<sup>7</sup>N 625 N 6250 N None of these
24 A rotating wheel accelerates up to the value of 0.75 rev/sec2after 2 seconds of its start. Its angular velocity becomes: 9.42 rad/sec 2.6 rev/sec 1.5 rev/sec Both A and C
25 The rear wheels of an automobile are rev/sec which is reduced to 38 rad/sec in 5 seconds when brakes are applied. Its angular acceleration is: 5 rad/sec<sup>2</sup> -10 rav/sec<sup>2</sup> -10 rad/sec<sup>2</sup> -5 rav/sec<sup>2</sup>
26 A car is moves around a circular track of radius 0.3 m at the rate of 120 rev/min. The speed v of the car is: 38 m/sec 3.8 m/sec 0.6 m/sec None of these
27 A stone is tied to the end of a 20 cm along string is whirled in a horizontal circle.
if centripetal acceleration is 9.8 m/sec2, then its angular velocity in rad/sec is:
 22/7 7 14 21
28 One radian is equal to: 30.3<span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">°</span> 45.3<span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">°</span> 50.3<span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">°</span> 57.3<span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">°</span>
29 When a body is moves along a circular path with constant speed, it has an acceleration, which is always directed: Along the tangent Toward the centre Away from the centre None of them
30 One radian is: Greater than one degree Less than one degree Equal to one degree None of them
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