PHY101 Quiz Spring 2021

Phy101…QuiZ File

1.    K.E can be defined as the dot product of….. Mass and velocity

2.    A wheel of radius 50 cm having the angular speed of 5 rad/s will have linear speed in m/s…. 2.5

3.    Lighter objects always reach the ground later than heaver objects….. 2 and 3 only

4.    In …. object  returns to its original position if displaced slightly….. stable equilibrium

5.    Newton first law is also called….. law of inertia

6.    A mosquito’s buzz is often rated with a decibel rating of 40 db….. 20

7.    The product of force and time is called change in ….. momentum

8.    People try to keep the ….. over their feet n order to feel stable….. center of gravity

9.    Which of the following statement/s s / are true..1 the weight of a man….. 1 only

10. If the magnitude of force applied is incorrect the work done will….. be increased

11. Unit of distance is….. light year

12. Power is equal to the dot product of force and…. Velocity

13.  product of vector a with itself is equal to….. A^2

14. For a body to e in equilibrium under the combined action of several forces…. The sum of the torques about any point must equal zero

15. The ratio of circumference of a circle to its diameter is equal to…. Pai

16. A net torque applied to a rigid object always tends to produce…. Angular acceleration

17. The work done by gravity during the descent of a projectile….. is positive

18. A man with his arms at his sides is spinning on a light friction less….. his angular momentum remains same

19. Example of physical quantity s….. length

20. Swimming becomes possible because of…. Third law of motion

21. The scalar product of two vectors is maximum when they are…. Parallel

22. Which of the following statements are true of sound waves.. identify all that apply…. A sound wave is a mechanical wave

23. The angular momentum vector of earth about its rotation axis. Due to its daily rotation. Is directed….. north

24. For an object in equilibrium the net torque acting on it vanishes only if each torque is calculated about ……the same point

25. People try to keep the..over their feet in order to feel stable…..centre of gravity

26. Add two vectors of length 4 m & 5 m but their orientation is not known ..the length after addition….. between 9 m and 1 m

27. Which statement is not true for acceleration….. riding your bike straight down the street at a constant speed

28. Acceleration of an object must be zero at a point where….. the instantaneous velocity is constant

29. Which of the following statements are true of sound waves.. identify ll that apply …… a sound wave is a mechanical wave

30. If the distance between all pairs of particles of the body do not change by applying a force then the body s sad to be….. rigid

31. A couple produces…. Purely rotational motion

32. To determine if a rigid body s in equilibrium the vector sum of the gravitational forces acting on the particles of the body can be replaced by a single force acting at….the center of gravity

33. Work may be done by….. only living organisms

34. The dimension of joule is……[m l2 t-2]

35. The slope of a velocity time the graph at any point may be identified with…. Instantaneous acceleration

36. The goal of all scientific inquiry or scientific method s….. predicting natural events based on known patterns

37. The center of mass of earths atmosphere is….. near the center of earth

38. Per second refers to the dimensions of physical quantity….. angular velocity, time period

39. Add two vectors of length 4m and 5m but their orientation is not known the length after addition….between 9m and 1m

40. The unit kg*m2/s can be used for….. angular momentum

41. When the velocity of an aeroplane is doubled the momentum….. is conserved

42. Power is equal to the dot product of force and…. Velocity.

43. Unit of distance is….. second

44. The law of inertia was firstly formulated by….. Galileo

45. What is the angle of projection of projectile for which its maximum height and horizontal range are equal….. 90

46. It is easier to walk on the concrete road than on ice because…. The friction between the ice and the feet less

47. A body will be in translational equilibrium if…. EF=0

48. When brakes are applied to a fact moving car the passenger will be thrown…. Forward

49. An elastic collision is one in which…. K.E and momentum are both conserved

50. A particle oscillating in simple harmonic motion is…. In equilibrium at the ends of its path because the acceleration is zero there

51. If the total momentum of a system is changing ….. a net external force must be acting on the system

52. The area under the velocity time graph is… distance

53. The fundamental dimensions of angular momentum are…. ML2T-1, Kgm2/s

54. An object living in a circle at constant speed…. Has an acceleration of constant magnitude

55. In the formula F=Gm11m2/r2 the quantity G….. is a universal constant of nature

56. The gravitational constant G has the derived units…. N*m2/kg2

57. A sound wave is a mechanical wave not an electromagnetic wave this means that….. a medium is required in order for sound waves to transport energy

58. As the wavelength of a wave in a uniform medium increases its frequency will…. Remains the same

59. Suitable units for the gravitational constant G are….. m3/ kg*s2