Physics most important

Very Important Physics mcqs

 

فزکس کے اہم ترین سوالات

 

 

1. The time taken to complete one revolution is called:





ANSWER= (B) time period

 

2. A mass attached to a spring completes 60 vibrations in half minute. Its frequency is :





ANSWER= (D) 2 hertz

 

3. The time displacement graph of SHM is:





ANSWER= (C) sine wave

 

4. The SI unit of spring constant is identical with that of:





ANSWER= (C) surface tension

 

5. The force that brings the body back to its equilibrium position is called:





ANSWER= (D) restoring force

 

6. SHM when acceleration is maximum, then velocity is:





ANSWER= (D) zero

 

7. The waveform of SHM is:





ANSWER= (A) sine wave

 

8. If the mass attached to a spring increases, then its angular frequency :





ANSWER= (A) remains constant

 

9. The length of simple pendulum having time peroid of 1 second is:





ANSWER= (C) 0.25m

 

10. The length of seconds pendulum is given by:





ANSWER= (C) 0.992m

 

11. The frequency of pendulum.................. If its lenght increases:





ANSWER= (B) decreases

 

12. Time peroid of second pendulum is :





ANSWER= (A) 1 sec

 

13. Product of time period of a simple pendulum and its frequency is given by:





ANSWER= (B) increases

 

14. If mass attached to a spring is made four times, the time period becomes:





ANSWER= (A) doubled

 

15. The toatl energy of mass spring system independent of:





ANSWER= (A) mass of the body

 

16. A physical system undergoing forced vibration is known as:





ANSWER= (A) driven harmonic oscillator

 

17. In damping system:





ANSWER= (A) energy is dissipated

 

18. The energy of the particle executing damped oscillations with time is used in doing work against:





ANSWER= (B) restoring force

 

19. Which of the following is an example of damped oscillations?:





ANSWER= (C) shock absorber of the car

 

20. The sharpness of the resonance curve of a resonating system depends on:





ANSWER= (D) loss of mechanical energy

 

21. At resonance, the transfer of energy is:





ANSWER= (A) maximum

 

22. A system in damped vibration is acted upon by an external peroidic force when damping is small, resonance is:





ANSWER= (A) sharp

 

23. The word fluid means:





ANSWER= (B) to flow

 

24. If temperature rises, the coefficient of viscositt of a liquid:





ANSWER= (A) decreases

 

25. Stoke's law holds for:





ANSWER= (C) spherical bodies

 

26. Which of the following is most viscous :





ANSWER= (A) Glycerine

 

27. Friction in fluids is known as:





ANSWER= (B) viscosity

 

28. As the speed of the object moving through a fluid increases, the upward drag force experienced by it:





ANSWER= (B) increases

 

29. When droplet has terminal velocity, the acceleration is:





ANSWER= (A) zero

 

30. The fluid is said to be incomprehensible, if its density is:





ANSWER= (D) constant

 

 

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