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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----
A) wrong.
B) right.
A) wrong.
In science, a theory is -------
A) a synthesis of a large body of well-tested knowledge
B) less than a fact.
C) unchangeable.
D) an educated guess
A) a synthesis of a large body of well-tested knowledge
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
A) 200 N.
B) 1000 N.
C) 500 N.
D) none of these
C) 500 N.
If no external forces are acting on a moving object, it will
A) continue moving at the same speed.
B) continue moving at the same velocity.
C) move slower and slower until it finally stops.
B) continue moving at the same velocity.
A ball is thrown upwards and returns to the same position. Compared with its original speedafter release, its speed when it returns is about --------
A) twice as much.
B) half as much.
C) the same.
D) four times as much
C) the same.
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 -------
A) after the light block.
B) before the light block.
C) at the same time as the light block.
C) at the same time as the light block.
Ten seconds after starting from rest, a car is moving at 40 m/s. What is the car's acceleration?
A) 0.25 m/s2
B) 4.0 m/s
C) 4.0 m/s 2
D) 10 m/s2
E) 40 m/s
C) 4.0 m/s 2
A kilogram is a measure of an object's
A) weight.
B) force.
C) mass.
D) size.
C) mass.
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
A) quadruples.
B) doubles.
C) stays the same.
D) halves.
E) none of these
D) halves.
The weight of a 1-kg mass at the Earth's surface is about
A) 1 kg.
B) 4.9 N.
C) 10 N.
D) 100 N.
E) none of these
C) 10 N.
While an object near the Earth's surface is in free fall, its
A) velocity increases.
B) acceleration increases.
C) mass increases.
D) velocity decreases.
A) velocity increases.
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)?
A) 2s
B) 4s
C) 5s
D) 0s
A) 2s
Whenever the net force on an object is zero, its acceleration
A) may be less than zero.
B) is zero.
C) may be more than zero
B) is zero.
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 ----
A) lead-filled ball.
B) regular ball.
C) same for both
A) lead-filled ball.
Compared to a 1-kg block of solid iron, a 2-kg block of solid iron has twice as much ----
A) inertia.
B) volume.
C) mass.
D) all of these
E) none of these
D) all of these
The two measurements necessary for calculating average speed are ------A) distance and acceleration.
B) velocity and time.
C) acceleration and time.
D) velocity and distance.
E) distance and time.
E) distance and time.
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
A) air resistance on the ball.
B) weight of the ball.
C) force that the ball exerts on the bat.
D) grip of the player's hand against the ball.
E) weight of the bat.
C) force that the ball exerts on the bat.
A 5 kg ball has a acceleration of 2 m/s2. The the magnitude of the force responsible forproducing this acceleration is
A) 3 N
B) 4 N
C) 10 kg
D) 10 N
E) none of these
D) 10 N
Which is the following is not a vector quantity?
A. Mass
B. Weight
C. Force
D. Acceleration
E. None of these
A. Mass
A ball is thrown upwards and returns to the same position. Compared with its original speedafter release, its speed when it returns is about --------
A) twice as much.
B) half as much.
C) the same.
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