Studied by 3 people

0.0(0)

Get a hint

Hint

1

Scientific hypothesis may turn out to be right or it may turn out to be wrong. If it is a valid hypothesis, there must be a test for proving it----

New cards

2

A) wrong.

New cards

3

B) right.

A) wrong.

New cards

4

In science, a theory is -------

New cards

5

A) a synthesis of a large body of well-tested knowledge

New cards

6

B) less than a fact.

New cards

7

C) unchangeable.

New cards

8

D) an educated guess

A) a synthesis of a large body of well-tested knowledge

New cards

9

A man weighing 1000 N stands at rest on two bathroom scales so that his weight is distributed evenly over both scales. The reading on each scale is

New cards

10

A) 200 N.

New cards

11

B) 1000 N.

New cards

12

C) 500 N.

New cards

13

D) none of these

C) 500 N.

New cards

14

If no external forces are acting on a moving object, it will

New cards

15

A) continue moving at the same speed.

New cards

16

B) continue moving at the same velocity.

New cards

17

C) move slower and slower until it finally stops.

B) continue moving at the same velocity.

New cards

18

A ball is thrown upwards and returns to the same position. Compared with its original speedafter release, its speed when it returns is about --------

New cards

19

A) twice as much.

New cards

20

B) half as much.

New cards

21

C) the same.

New cards

22

D) four times as much

C) the same.

New cards

23

Neglecting friction, a large block of ice and a small block of ice start sliding down an inclinetogether. The heavier block will get to the bottom -------

New cards

24

A) after the light block.

New cards

25

B) before the light block.

New cards

26

C) at the same time as the light block.

C) at the same time as the light block.

New cards

27

Ten seconds after starting from rest, a car is moving at 40 m/s. What is the car's acceleration?

New cards

28

A) 0.25 m/s2

New cards

29

B) 4.0 m/s

New cards

30

C) 4.0 m/s 2

New cards

31

D) 10 m/s2

New cards

32

E) 40 m/s

C) 4.0 m/s 2

New cards

33

A kilogram is a measure of an object's

New cards

34

A) weight.

New cards

35

B) force.

New cards

36

C) mass.

New cards

37

D) size.

C) mass.

New cards

38

An object is propelled along a straight-line path in space by a force. If the mass of the object somehow becomes twice as much, its acceleration

New cards

39

A) quadruples.

New cards

40

B) doubles.

New cards

41

C) stays the same.

New cards

42

D) halves.

New cards

43

E) none of these

D) halves.

New cards

44

The weight of a 1-kg mass at the Earth's surface is about

New cards

45

A) 1 kg.

New cards

46

B) 4.9 N.

New cards

47

C) 10 N.

New cards

48

D) 100 N.

New cards

49

E) none of these

C) 10 N.

New cards

50

While an object near the Earth's surface is in free fall, its

New cards

51

A) velocity increases.

New cards

52

B) acceleration increases.

New cards

53

C) mass increases.

New cards

54

D) velocity decreases.

A) velocity increases.

New cards

55

A ball is thrown upwards from the surface of the earth at the speed 10m/s. It returns to thesame position. How long does it stay in the air (neglect the air resistance)?

New cards

56

A) 2s

New cards

57

B) 4s

New cards

58

C) 5s

New cards

59

D) 0s

A) 2s

New cards

60

Whenever the net force on an object is zero, its acceleration

New cards

61

A) may be less than zero.

New cards

62

B) is zero.

New cards

63

C) may be more than zero

B) is zero.

New cards

64

Two tennis balls fall through the air from a tall building. One of them is filled with leadpellets. In presence of air-resistance, the ball to reach the ground first is the ----

New cards

65

A) lead-filled ball.

New cards

66

B) regular ball.

New cards

67

C) same for both

A) lead-filled ball.

New cards

68

Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has twice as much ----

New cards

69

A) inertia.

New cards

70

B) volume.

New cards

71

C) mass.

New cards

72

D) all of these

New cards

73

E) none of these

D) all of these

New cards

74

The two measurements necessary for calculating average speed are ------A) distance and acceleration.

New cards

75

B) velocity and time.

New cards

76

C) acceleration and time.

New cards

77

D) velocity and distance.

New cards

78

E) distance and time.

E) distance and time.

New cards

79

A player hits a ball with a bat. The action force is the impact of the bat against the ball. Thereaction to this force is the

New cards

80

A) air resistance on the ball.

New cards

81

B) weight of the ball.

New cards

82

C) force that the ball exerts on the bat.

New cards

83

D) grip of the player's hand against the ball.

New cards

84

E) weight of the bat.

C) force that the ball exerts on the bat.

New cards

85

A 5 kg ball has a acceleration of 2 m/s2. The the magnitude of the force responsible forproducing this acceleration is

New cards

86

A) 3 N

New cards

87

B) 4 N

New cards

88

C) 10 kg

New cards

89

D) 10 N

New cards

90

E) none of these

D) 10 N

New cards

91

Which is the following is not a vector quantity?

New cards

92

A. Mass

New cards

93

B. Weight

New cards

94

C. Force

New cards

95

D. Acceleration

New cards

96

E. None of these

A. Mass

New cards

97

A ball is thrown upwards and returns to the same position. Compared with its original speedafter release, its speed when it returns is about --------

New cards

98

A) twice as much.

New cards

99

B) half as much.

New cards

100

C) the same.

New cards