ECAT Pre General Science Physics Chapter 8 Waves With Answers

ECAT Pre General Science Physics Chapter 8 Waves

Sr. # Questions Answers Choice
1 Smaller the damping, the resonance will be more flat more sharp both of them none of them
2 Smaller the damping, greater will be the frequency wavelength amplitude none of them
3 The damping depends upon the amplitude sharpness both of them none of them
4 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
5 In the resonance condition, the amplitude of the oscillator becomes very large very small zero any one of them
6 Shock absorber of the car is an example of resonance forced oscillations interference damped oscillations
7 The process in which energy is dissipated from the oscillating system is known as resonance interference diffraction damping
8 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
9 While describing the motion of a simple pendulum, the frictional effects are taken into account completely ignored partially ignored none of them
10 Such oscillations in which the amplitude decreases steadily with time, are called resonance force oscillations large oscillations damped oscillations
11 The waves produced in a microwave oven have wavelength. 12 mm 12 cm 12 m 12 mm
12 The waves produced in a microwave oven have frequency 2450 Hz 2450 K Hz 2450 M Hz 2450 G Hz
13 A swing has one natural frequency two natural frequencies three natural frequencies four natural frequencies
14 Which one of the following is an example of resonance swing tuning a radio microwave oven all of them
15 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
16 At 'resonance' the transfer of energy from deriving source to the oscillator is maximum minimum zero none of them
17 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
18 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
19 Associated with the motion of a driven harmonic oscillator, there is a very striking phenomenon, know as waves beat interference resonance
20 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
21 A physical system under going forced vibrations is known as Simple harmonic oscillator Compound harmonic oscillator Physical harmonic oscillator driven harmonic oscillator
22 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
23 The natural frequency of a pendulum which is vibrating freely, depends upon its mass length material all of them
24 The frequency of free vibrations is known as free frequency forced frequency natural frequency un-natural frequency
25 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
26 If a simple pendulum is shifted from karachi to K-2 cliff, its time period remains the same decreases increases none of them
27 The time period of pendulums of different lengths would be same different both of them none of them
28 A second's pendulum is a pendulum whose time period is 1 second 2 seconds 3 seconds 4 seconds
29 If the mass of the simple pendulum becomes double, its time period increase decreases remains constant none of them
30 If we increase the length of a simple pendulum four times, its time period will become 2 times 3 times 4 times 6 times
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