ECAT Pre General Science Physics Online Test With Answers

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ECAT Pre General Science Physics Online Test

Sr. # Questions Answers Choice
1 The amplitude of oscillation of each atom in a metallic crystal rises with the rise in temperature decrease in temperature even temperature remains constant all of them
2 The molecules or ions in a crystalline solids are static not static randomly moving all of them
3 The vast majority of solids are in the form of amorphous structure polymeric structure crystalline structure all of them
4 The neighbours of every molecule in crystalline solids are arranged in an irregular manner a regular manner any manner none of them
5 The solids which has structure in-between order and disorder are called amorphous solids polymeric solids crystalline solids all of them
6 There is a regular arrangement of molecules in a amorphous solids polymeric solids crystalline solids none of them
7 If a freely oscillating system is subjected to an external force, then free vibrations will take place the body will move with its natural frequency forced vibrations will take place none of them
8 The natural frequency of a pendulum which is vibrating freely, depends upon its mass length material all of them
9 The frequency of free vibrations is known as free frequency forced frequency natural frequency un-natural frequency
10 A body is executing free vibrations when it oscilates with the interference of an external force without the interference of an external force with the interference of an internal force none of them
11 If a simple pendulum is shifted from karachi to K-2 cliff, its time period remains the same decreases increases none of them
12 The time period of pendulums of different lengths would be same different both of them none of them
13 A second's pendulum is a pendulum whose time period is 1 second 2 seconds 3 seconds 4 seconds
14 If the mass of the simple pendulum becomes double, its time period increase decreases remains constant none of them
15 If we increase the length of a simple pendulum four times, its time period will become 2 times 3 times 4 times 6 times
16 Energy is dissipated and consequently the energy mass system do not oscillate indefinitely because of very small energy very large energy frictional forces acceleration due to gravity
17 The total energy of spring mass system is zero changing with time constant none of them
18 When the bob of simple pendulum is at mean position, its K.E will be maximum minimum zero all of them
19 When the bob of simple pendulum is at extreme position, its K.E. will be maximum minimum zero all of them
20 When a mass 'm' is pulled slowly through a distance 'xo' , the elastic potential energy of the spring would be P.E=Kx<sup>2</sup><sub>o</sub> P.E= 1/2kx<sub>o</sub> P.E=1/2Kx<sup>2</sup><sub>o</sub> P.E=Kx<sup>2</sup><sub>o</sub>
21 When a mass 'm' is pulled slowly, the spring stretches by an amount xo, then the work done will be W=Kx<sub>o</sub> W=1/2Kx<sub>o</sub> W=1/2Kx<sup>2</sup><sub>o</sub> W=4Kx<sub>o</sub>
22 When a mass 'm' is pulled slowly, the spring stretches by an amount x0,then the average force would be F= Kx<sub>0</sub> F=1/2Kx<sub>0</sub> F=2Kx<sub>0</sub> F=4Kx<sub>0</sub>
23 If the time period a simple pendulum is 2 s, its frequency would be 2 Hz 1.5 Hz 1.0 Hz 0.5 Hz
24 If the length of a simple pendulum is 0.25 m its time period would be 1.0 s 2.0 s 3.0 s 4.0 s
25 Time period of simple pendulum is independent of length mass acceleration due to gravity none of them
26 Time period of a simple pendulum depends upon the length of the pendulum acceleration due to gravity none of them both of them
27 If the length of second pendulum becomes four times then its time period will become Four time Two times Six times Eight times
28 The weight 'mg' of the bob is resolved into one component two components three components four components
29 The bob of a simple pendulum is suspended by string heavy inextensible string light extensible string light inextensible string
30 A simple pendulum consists of a small light bob small heavy bob big light bob big heavy bob
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