Physical Science Sem I Final Exam

A testable prediction is what?

• A testable prediction is a theory or statement that cannot be proven or disproven.

• A testable prediction is a wild guess with no basis in evidence.
• A testable prediction is a random idea with no connection to scientific inquiry.
• A testable prediction, known as a hypothesis, is a statement that can be tested through experimentation or observation.

Tags

NGSS.MS-LS1-1

Why does a cork float in water?

• The cork floats because its buoyancy force is greater than its mass.

• The cork floats because its buoyancy force is less than its density.

• The cork floats because its buoyancy force is equal to the mass of the water

• The cork does not float it sinks because it is more dense than water.

When are buoyancy forces equal?

• When the object is submerged in a solid
• When the object's mass is equal to the buoyancy forces being applied under it.

• When the object is moving at a constant speed in a fluid
• When the object is in a vacuum

How can we calculate the volume of an irregularly shaped object

• Displacement method
• Density method
• Area method
• Weight method

The upward force exerted on an object falling through the air is what?

• Air resistance or drag
• Gravity
• Friction
• Magnetic force

An object moving in a circular path accelerating toward the center is experiencing what?

• Centripetal acceleration
• Radial acceleration
• Centrifugal acceleration
• Tangential acceleration

What is the formula for calculating density?

• Density = Mass / Volume
• Density = Weight / Volume
• Density = Mass * Volume
• Density = Volume / Mass

Why do object's sink in water?

• Objects sink due to the force of gravity and the buoyant force of water.
• Objects sink because they are made of metal
• Objects sink because they are too heavy
• Objects sink because they are too light

In order to stay airborne and in level flight a helicopter's tail rotor must spin how many times faster than the main rotor?

• 5
• 1.5
• 3
• 2

An diver in water feels pressure from what direction?

• Only from the sides
• Only from below perpendicular to their body's surface

• All directions perpendicular to their body's surface

• Only from above parallel to their body's surface