Engineering Physics Online Test

1. The displacement of particles in a string stretched in the x-direction is represented by y. Among the following expressions for y, those describing wave motion are ____________

2. In a hand driven grinding machine, the handle is put _____________

3. Which statement is incorrect?

4. The water at the foot of the fall will be at a different temperature from that at the top.

5. A hammer is resting on a plane surface. If force P is applied on the hammer along with a line not passing through its centre of mass, them the hammer _____________

6. In which medium sound travels faster?

7. The increase in internal energy of a system is equal to the work done in the system. Which process does the system undergo?

8. In case of a forced vibration, the resonance wave becomes very sharp when the ___________

9. The Energy of the particle is proportional to ____________

10. Air is more elastic than water.

11. A wave of frequency 100Hz travels along a string towards its fixed end. When this wave travels back, after reflection, a node is formed at a distance of 10cm from the fixed end. The speed of the wave (incident and reflected) is?

12. The speed of driving a car safely depends on ___________

13. Calculate the minimum uncertainty in the momentum of a 4He atom confined to 0.40 nm.

14. A wire fixed at the upper end stretches by length l by applying a force F. What is the work done in stretching?

15. The phase difference between the instantaneous velocity and acceleration of a particle executing simple harmonic motion is ___________

16. What is the time period of a pendulum hanged in a satellite? (T is the time period on earth)

17. A body of mass M while falling vertically downwards under gravity breaks into two parts, a body B of mass 1/3 M and body C of mass 2/3 M. The centre of mass of bodies B and C taken together shifts compared to that of body A towards ___________

18. If a simple pendulum oscillates with amplitude of 50mm and time period of 2s, then its maximum velocity is?

19. Potential energy is also called mutual energy.

20. The kinetic energy is water is used to run turbines.

21. In a capillary tube experiment, a vertical, 30 cm long capillary tube is dipped in water. The water rises up to a height of 10 cm due to capillary action. If this experiment is conducted in a freely falling elevator, the length of the water column becomes ___________

22. In Raman spectroscopy, the radiation lies in the ________

23. Assertion: Smaller drops of liquid resist deforming forces better than the larger drops.
Reason: Excess pressure inside a drop is directly proportional to its surface area.

24. Waves in the wave packets are such that they interfere constructively over a large region of space.

25. The coefficient of volumetric expansion of mercury is 18×10^-5/°C. The thermometer bulb has a volume of 10^-6 m³ and cross-section of the stem is 0.002cm². Assuming that bulb is filled with mercury at 0°C, the increase in length of the mercury column at 100°C will be ___________

26. The Q-value of fission reaction is of the order ___________

27. The cosmic background radiation observed is starlight.

28. Length of a string tied to two rigid supports is 40cm. Maximum length (wavelength in cm) of a stationary wave produced on it is?

29. Which of the following is the correct expression for the magnetic moment of the electron?

30. Sound travels through a gas under which of the following condition?

31. Heat was given to a body, which raises its temperature by 1°C is ___________

32. The Schrodinger for the particle inside a finite potential well becomes ____________

33. What is the most fundamental property of wave?

34. The motion of a wave packet is similar to _____________

35. Two trains, each moving with a velocity of 30m/s, cross each other. One of the trains gives a whistle whose frequency is 600Hz. If the speed of sound is 330m/s, the apparent frequency for passengers sitting in the other train before crossing would be __________

36. A body is moving along a straight path. What will happen to the body in the absence of an external field?

37. In which of the following ways the accelerated motion of a body will occur under an external force?

38. G is called gravitation constant.

39. If two sound waves having a phase difference of 60°, then they will have a path difference of __________

40. A body A of mass 0.5kg and specific heat 0.85 is at a temperature of 60°C. Another body B of mass 0.3kg and specific heat 0.9 is at a temperature of 90°C. When they are connected to a conducting rod, heat will flow from ___________

41. A body in linear motion can never be in equilibrium.

42. Assertion: The radiation from the sun’s surface varies as the fourth power of its absolute temperature.
Reason: Sun is not a black body.

43. A rod of length 5 m is moving at a speed of 0.6 c. To an observer sitting perpendicular to the direction of motion, the length appears to be _______________

44. Mechanical waves are called elastic waves.

45. Nova are thought to occur in a system, X, in which a white-dwarf star orbits a red giant star. What is X?

46. M⁰ L⁰ T^(-1) is an example for ___________

47. A bullet of mass 20g is found to pass two points 30m apart in a time interval of 4s. Calculate the kinetic energy of the bullet if it moves with constant speed.

48. What is the lattice constant for FCC crystal having atomic radius 1.476 Å?

49. The potential energy of a simple harmonic oscillation when the article is halfway to its end point is ___________

50. What is the ration of the force of attraction between two bodies kept in the air and the same distance apart in the water?