ECAT Pre General Science Online Test With Answers

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ECAT Pre General Science Online Test

Sr. # Questions Answers Choice
1 The damping depends upon the amplitude sharpness both of them none of them
2 The resonance will be sharp, if the amplitude decreases rapidly at a frequency equal to the resonant frequency slight different from the resonant frequency greatly different from the resonant frequency any one of them
3 In the resonance condition, the amplitude of the oscillator becomes very large very small zero any one of them
4 Shock absorber of the car is an example of resonance forced oscillations interference damped oscillations
5 The process in which energy is dissipated from the oscillating system is known as resonance interference diffraction damping
6 As the bob of the pendulum moves to and fro which of the force is experienced by the bob its weight tension in the string viscous drag force by air all of them
7 While describing the motion of a simple pendulum, the frictional effects are taken into account completely ignored partially ignored none of them
8 Such oscillations in which the amplitude decreases steadily with time, are called resonance force oscillations large oscillations damped oscillations
9 The waves produced in a microwave oven have wavelength. 12 mm 12 cm 12 m 12 mm
10 The waves produced in a microwave oven have frequency 2450 Hz 2450 K Hz 2450 M Hz 2450 G Hz
11 A swing has one natural frequency two natural frequencies three natural frequencies four natural frequencies
12 Which one of the following is an example of resonance swing tuning a radio microwave oven all of them
13 Resonance occurs when one of the natural frequencies of vibration of the forced or driven harmonic oscillator greater than the frequency of applied force equal to the frequency of applied force less than the frequency of applied force all of them
14 At 'resonance' the transfer of energy from deriving source to the oscillator is maximum minimum zero none of them
15 In a resonance situation the amplitude of the motion may become extra ordinarily large, if the driving force is large the driving force is zero the driving force may be feeble all of them
16 If the external driving force is periodic with a period compareable to the natural period of the oscillator, then we get diffraction beat interference resonance
17 Associated with the motion of a driven harmonic oscillator, there is a very striking phenomenon, know as waves beat interference resonance
18 The vibrations of factory floor caused by the running of heavy machinery is an example of free vibration natural vibrations forced vibrations all of them
19 A physical system under going forced vibrations is known as Simple harmonic oscillator Compound harmonic oscillator Physical harmonic oscillator driven harmonic oscillator
20 In a transistor, if the central region is p-type then this type of transistor is known as p-n-p transistor n-p-n transistor either of these none of these
21 Which of the following diodes can operate in the reverse biased condition photo diode light emitting diode photo voltaic cell none of these
22 Which of the following diode is used to derive the current in external circuit when light is incident in the circuit photo diode light emitting diode photo voltaic cell none of these
23 F = I(L x B) is a vector scalar unit vector none of these
24 The gavanometer constant of a moving coil galvanometer is given by K=BAN/C K=BN/CA K=NAC/B K=C/BAN
25 When the waveform of one voltage is increasing and that of second is decreasing and vice versa, then phase difference between these voltage is 90<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 75<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 0<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 180<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span>
26 The CRO is used for displaying the waveform of a given current voltage both of them none of them
27 The voltage increases linearly with time velocity acceleration torque
28 How many number of anodes used in electron gun one two three six
29 If a nucleus emits an alpha particle, its mass number decreases by 4 while charge number decreased by -4 4 2 1
30 Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in 1916 1919 1921 1923
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