PHY 101 CBT Practice

1. An event is completely specified by ______.

2. The impulse of a bullet of mass 0.001 kg fired at 800 m/s is ______.

3. The speed of light in vacuum is ______ for all inertial observers regardless of their motion.

4. Since weight has both magnitude and direction, it is a ______ quantity.

5. The principle stating that the laws of physics are the same in all inertial frames is the ______ postulate of special relativity.

6. The magnitude of friction during motion depends mainly on the ______.

7. When relative motion exists between surfaces, friction is ______.

8. Banking of roads prevents vehicles from ______.

9. The unit of coefficient of friction is ______

10. “To every action, there is an equal but opposite reaction” is known as ______.

11. At high speed, friction between moving surfaces generally ______.

12. A push or pull that tends to change the state of motion of a body is known as ______.

13. In circular motion, acceleration is always directed toward the ______.

14. An automobile moving at 100 km/h on a level road with coefficient of friction 0.5 can be stopped in a minimum distance of ______.

15. Events that are simultaneous in one inertial frame may ______ in another inertial frame moving relative to it.

16. If upward forces are taken as positive, downward forces must be ______.

17. A reference frame moving with constant velocity relative to another is known as an ______ reference frame.

18. According to special relativity, a moving clock appears to run ______ when observed from a stationary frame.

19. The speed of a satellite orbiting just above Earth’s surface is approximately ______.

20. When coins placed on a paper strip do not fall off after a sudden jerk, the effect responsible is ______.

21. If rightward forces are taken as positive, leftward forces must be ______ to satisfy equilibrium.

22. In uniform circular motion, acceleration increases with force and decreases with mass.

23. All inertial reference frames are related by ______ motion with respect to one another.

24. The force that produces an acceleration of 1 m/s² in a body of mass 1 kg is called ______

25. The shortening of length observed when an object moves at relativistic speed is known as ______.

26. When the net force acting on a particle is not zero, the particle is ______.

27. The time interval measured by an observer moving with the clock is called ______.

28. When the sum of all forces acting on a body is zero, the body satisfies the ______ condition of equilibrium.

29. An automobile traveling at 27.78 m/s on a wet road (μ = 0.3) stops after ______.

30. When there is no relative motion between surfaces, the friction present is ______.

31. The ratio of limiting friction to normal reaction is ______.

32. If a spacecraft moves at 0.92c and the proper time between clock ticks is 1 s, the time interval measured on Earth is ______.

33. A rocket travels at 0.80c and takes 30 years to reach a planet as measured on Earth. The distance to the planet is ______ light-years.

34. A 0.001 kg bullet embeds into a 1 kg wooden block at rest. The final velocity is ______.

35. The coefficient of friction must always be less than one.

36. A 1.5 kg book is pressed against a wall with normal force 25 N. The minimum coefficient of static friction required is ______.

37. A cyclist of mass 30 kg applies a force of 250 N and accelerates at 4 m/s². The frictional force between the tyre and road is ______.

38. A body at rest or moving with uniform velocity has an acceleration of ______.

39. A system moving with uniform velocity or at rest is said to be in ______.

40. If a string is stretched by two opposite forces of 10 N each, the tension in the string is ______.