GMAS Review12

The fact that matter is neither created nor destroyed in any chemical or physical change is called the ________.

• law of exothermic change

• law of thermal matter

• law of endothermic change

• law of conservation of matter

Which of the following experimental set-ups would be the best to use if a scientist were trying to confirm the speed of light in space?

• A laser is assembled in a vacuum chamber.

• A laser is assembled in a chamber filled with steel.

• A laser is assembled in a chamber filled with humid air.

• A laser is assembled in a chamber filled with dry air.

When an atom loses an electron, it ________.

• it becomes negatively charged

• it forms a covalent bond

• it becomes positively charged

• it becomes neutral

Which of the following is the best evidence for a chemical reaction?

• change in temperature

• formation of a new substance

• change in state

• gas bubbles

When a zero net force acts on an object, the force ________.

• changes the motion of an object

• must be greater than the reaction force

• does not change the motion of an object

• is equal to the weight of an object

In a game of tug-of-war, Mrs. Payne’s homeroom pulls on the rope with a force of 300 N to the right and Mrs. Rainey’s homeroom pulls on the rope with a force of 100 N to the left. What is the net force on the rope?

• the forces are balanced

• 200 N to the left

• 200 N to the right

• 300 N to the right

Which of the following explains the effect of gravity in space?

• There is no gravity in space.

• Gravity in space will be determined by the closeness of matter with a large mass.

• Gravity in space will be determined by the closeness of matter with a small mass.

• Gravity in space will be determined by the location of electromagnetic radiation.

How do microwaves cook food?

• by using electromagnetic waves and the process of radiation

• by using forced hot air currents through the process of convection

• by using the movement of charged particles through the process of induction

• by using direct contact of moving particles through the process of conduction

A magnetic resonance imager (MRI) is used in hospitals to observe internal organs. The patient being imaged cannot have anything that will be attracted to the imager's powerful magnet. Which might cause a patient the most problems?

• an aluminum belt buckle

• dental fillings made from silver and mercury

• a brass zipper

• a steel replacement joint

According to Newton’s second law of motion, if the force acting on an object stays the same, but the mass of the object increases, then acceleration will ___.

• increase

• decrease

• remain the same

• stop completely