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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----

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A) wrong.

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B) right.

A) wrong.

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

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

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B) less than a fact.

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C) unchangeable.

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D) an educated guess

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

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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

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A) 200 N.

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B) 1000 N.

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C) 500 N.

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D) none of these

C) 500 N.

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

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A) continue moving at the same speed.

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B) continue moving at the same velocity.

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C) move slower and slower until it finally stops.

B) continue moving at the same velocity.

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

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A) twice as much.

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B) half as much.

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C) the same.

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D) four times as much

C) the same.

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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 -------

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A) after the light block.

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B) before the light block.

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C) at the same time as the light block.

C) at the same time as the light block.

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

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A) 0.25 m/s2

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B) 4.0 m/s

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C) 4.0 m/s 2

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D) 10 m/s2

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E) 40 m/s

C) 4.0 m/s 2

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A kilogram is a measure of an object's

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A) weight.

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B) force.

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C) mass.

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D) size.

C) mass.

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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

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A) quadruples.

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B) doubles.

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C) stays the same.

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D) halves.

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E) none of these

D) halves.

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

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A) 1 kg.

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B) 4.9 N.

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C) 10 N.

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D) 100 N.

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E) none of these

C) 10 N.

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

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A) velocity increases.

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B) acceleration increases.

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C) mass increases.

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D) velocity decreases.

A) velocity increases.

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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)?

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A) 2s

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B) 4s

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C) 5s

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D) 0s

A) 2s

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

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A) may be less than zero.

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B) is zero.

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C) may be more than zero

B) is zero.

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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 ----

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A) lead-filled ball.

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B) regular ball.

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C) same for both

A) lead-filled ball.

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

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A) inertia.

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B) volume.

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C) mass.

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D) all of these

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E) none of these

D) all of these

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

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B) velocity and time.

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C) acceleration and time.

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D) velocity and distance.

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E) distance and time.

E) distance and time.

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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

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A) air resistance on the ball.

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B) weight of the ball.

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C) force that the ball exerts on the bat.

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

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E) weight of the bat.

C) force that the ball exerts on the bat.

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

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A) 3 N

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B) 4 N

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C) 10 kg

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D) 10 N

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E) none of these

D) 10 N

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Which is the following is not a vector quantity?

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A. Mass

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B. Weight

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C. Force

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D. Acceleration

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E. None of these

A. Mass

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

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A) twice as much.

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B) half as much.

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C) the same.

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