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 What is the coefficient of mutual inductance, when the magnetic flux changes by 2 X 10-2Wb, and change in current is 0.01 A? 2 H 3 H 1/2 H Zero
2 The device in which induced emf is statically induced emf is: Transformer AC generator Alternator Dynamo
3 For inducting emf in a coil the basic requirement is that: Flux should link the coil Change in flux should link the coil Coil should form a closed loop Both B and C are true
4 A spring of constant k = 0.4 N m-1is to be extended through 10 cm at a place where g = 10 m sec-2. The mass to be suspended should be: 4 gms 0.4 gm 40 gms None of these
5 A body with frequency would complete one vibration in: f seconds 1/f seconds 1 second f<sup>2</sup>second
6 If a given spring of spring constant k is cut into two indentical segments, the spring constant of each segment is: k/2 2 k 4 k None of these
7 In SHM, there is always a constant ratio between displacement if body and its: Velocity Period Mass Acceleration
8 The number of vibrations in two seconds can be expressed as______if frequency of vibration is f. f 2 f 3 f 1/2 f
9 If a force of 0.05 N produces an elongation of 20 mm in 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
10 If a mass of 10 gm is suspended from a spring of k = 9.8 Nm-1, then the extension will be: 1 cm 1 m 10 mm None of these
11 A particle is moving along a circular path with uniform speed. Its projection will execute____along the____of the circle: Circular motion, circumference Vibrator, chord SHM, diameter SHM, circumference
12 The time taken to complete one vibration is called: Frequency Amplitude Time Time period
13 When quarter of a cycle 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>
14 The body oscillates due to ______ accelerates and overshoots the rest position due to _____: Applied force , inertia Restoring force, friction Frictional force, inertia Restoring force, inertia
15 Amplitude in SHM is equivalent to_____ in circular motion: Diameter Radius Circumference None of these
16 The graph showing the variation of displacement with time is a: Sine curve Straight line Parabola None of these
17 When a body is vibrating, the displacement from mean position: Increases with time Decreases with time Changes with time None of these
18 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
19 The SI unit of spring constant is identical with that of: Force Surface tension Pressure Loudness
20 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
21 The unit of spring constant is: J-sec Metre Nm<sup>-1</sup> None of these
22 To and fro motion of a body is about its mean position is known as: Translatory motion Vibratory motion Rotatory motion None of these
23 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
24 Free oscillations are always produced by: An applied force Gravitational force Restoring force and inertia Inertia only
25 An object undergoes SHM. Its maximum equilibrium positions: Maximum Half of its maximum value Zero None
26 Second's pendulum is the pendulum whose time period is: 1 second 2 second 3 second None of these
27 The string of a simple pendulum should be: Heavy Extensible In-extensible None of these
28 The time period of a simple pendulum is independent of its: Length Mass Value of g Both A and B
29 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
30 Distance covered during one vibration of an oscillating body in terms of amplitude A is: A 2 A 3 A 4 A
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