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 The waves which propagate through the oscillations of material particles are known as: Mechanical waves Electromagnetic waves Any of them None of them
2 The restoring force is always directed towards: Rest position Equilibrium position Mean position All of them
3 Amplitude is the displacement of the vibrating body from: One extreme position to the other extreme position Mean position any one extreme position Both A and B are correct None of these
4 An oscillating body oscillates due to: Applied force Restoring force Frictional force None of these
5 An angle of 180° in circular motion is equivalent to ______ in SHM. Half the vibration One vibration 3/4th of a vibration None of these
6 In SHM, the acceleration is ______ when velocity is _____: Zero, smallest Smallest, zero Zero, zero Zero, greatest
7 An object in SHM will have maximum speed when its displacement from equilibrium position is: Infinity Maximum Zero Minimum
8 If there identical strings each of constant K are hooked together the spring constant of resultant spring will be: 3 K 2 K K/4 K/3
9 Hertz is unit of: Time period Displacement Amplitude Frequency
10 A spring of constant k = 0.4 N m-1is to be extended thorugh 10 cm at a place where g = 10 m sec-2. The mass to be suspended should be: 4 gms 0.4 gms 40 gms None of these
11 A body with frequency of would complete one vibration in: f seconds 1/f seconds 1 second f<sup>2</sup>second
12 If a given spring of spring constant K is cut into two identical segments, the spring constant of each segment is: K/2 2 K 4 K None of these
13 The number of vibration in two seconds can be expressed as
______ of frequency of vibration is f:
 f 2 f 3 f 1/2 f
14 If a force of 0.05 N produces an elongation of 20 mm in a string, then its spring constant will be: 250 N m<sup>-1</sup> 25 N m<sup>-1</sup> 2.5 N m<sup>-1</sup> None of these
15 If mass of 10 gm is suspended from a spring of K=0.8 Nm-1then the extension will be: 10 cm 1 m 10 mn None of these
16 A particle is moving along a circular path with uniform speed. Its projection will execute ___along the _____ of the circle: Circular motion, circumference Vibratory, chord SHM, diameter SHM, circumference
17 When quarter of a circle is completed, 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>
18 The body oscillates due to _____ accelerates and overshoots the rest position due to______,: Applied force, inertial Restoring force, friction Frictional force, inertial Restoring force, inertial
19 Amplitude in SHM is equivalent to ______ in circular motion: Diameter Radius Circumference None of these
20 The restoring force is _____ and opposite to the applied force within ______,: Equal, elastic limit Different, the walls of the laboratory Different, elastic limit None of these
21 When a mass attached to a spring begins to move left or right from the equilibrium position, its P.E.: Increases Decreases Remains constant None of these
22 To and from motion of a body about its mean position is known as: Translatory motion Vibratory motion Rotatory motion None of these
23 In a _____ flow, each particle of the fluid is called a streamline and different streamlines ______cross each other. Streamline, cannot Turbulent, cannot Streamline, can None of these
24 The study of fluid in motion basically involves law of conservation of: Mass Energy Change Both A and C Both A and B
25 The drag force acting on a spherical droplet of radius 10-5m moving with a velocity of 1 cm/sec in a fluid of velocity 5.31 x 10-7m/sec. The units comes out to be: 10<sup>-16</sup>N 10<sup>-14</sup>N 10<sup>-12</sup>N 10<sup>-10</sup>N
26 The dimensions of viscosity are: M<sup>2</sup>L<sup>-1</sup>T<sup>-2</sup> M<sup>-1</sup>L<sup>1</sup>T<sup>-1</sup> M<sup>-1</sup>L<sup>-1</sup>T ML<sup>-1</sup>T<sup>-1</sup>
27 The unit of viscosity is SI system is: Kg<sup>-1</sup>m sec<sup>-1</sup> Kgm<sup>-1</sup> sec<sup>-1</sup> Kg<sup>-1</sup>m<sup>-1</sup> sec None of these
28 When the upward drag force of the fluid becomes equal to downward force of gravity of the droplet, then its velocity: Starts increasing Starts decreasing Becomes constant Is called escape velocity
29 0.10 cm can be written as: 1.0 x 10<sup>-2</sup>m 1.0 x 10<sup>-3</sup>cm 1.0 x 10<sup>-4</sup>cm 1. x 10<sup>-4</sup>m
30 Stoke;s law is not applicable when the speed of the object moving through a fluid is: Zero Small Large None of these
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