Physical Science: Question Preview (ID: 30897)

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What is the effect of prolonged exposure to an excessive amount of ultraviolet radiation?
a) Birth defects would result from mutated DNA and be apparent in later generations. b) Ultraviolet radiation would build up within the organism, destroying its internal organs. c) Mutations in genetic material would occur and cause a cancerous overgrowth of skin cells. d) Behavioral changes, such as lack of coordination, memory loss, and loss of motor skills, would occur.
Which statement explains why infrared waves are generally referred to as heat waves?
a) They are the primary waves emitted by the Sun. b) Their frequencies are higher than those of visible light. c) They are absorbed, not reflected, by the skin. d) The most common type is thermal radiation.
What is the purpose of a generator?
a) to measure forces b) to create electrical energy c) to produce a magnetic field d) to generate a mechanical force
Which energy transformation is found in an electric motor?
a) electrical energy → chemical energy b) mechanical energy → electrical energy c) electrical energy → mechanical energy d) chemical energy → mechanical energy
If a car is traveling at an average speed of 70 kilometers per hour, how long does it take the car to travel 14 kilometers?
a) 0.20 hour b) 0.51 hour c) 0.84 hour d) 5.10 hours
An object originally at rest is uniformly accelerated along a straight-line path to a speed of 12 m/s in 3.0 seconds. What is the acceleration of the object?
a) 1.25 m/s/s b) 4.0 m/s/s c) 15 m/s/s d) 36 m/s/s
Which correctly describes infrared radiation?
a) They are light waves that can be detected by the human eye. b) They are high-energy waves that can damage the eyes and skin. c) They are waves with frequencies lower than red on the visible spectrum. d) They are waves with frequencies higher than violet on the visible spectrum.
Which statement about the electromagnetic spectrum is true?
a) Energy with longer wavelengths are more damaging than energy with shorter wavelengths. b) Exposure to any type of energy on the electromagnetic spectrum will cause cellular damage. c) Information carried by most wavelengths of the spectrum are not visible to the human eye. d) Visible light has the shortest wavelengths of all energy on the electromagnetic spectrum.
Which law is best described as a body at rest tends to remain at rest, and a body in motion tends to remain in motion, unless acted upon by an unbalanced force.
a) law of forces b) law of friction c) law of gravity d) law of inertia
What will happen to an object in motion with no unbalanced force acting on it?
a) It will continue to accelerate until it reaches the speed of light. b) It will gradually slow down and come to a rest. c) It will continue to move at a constant speed. d) It will initially accelerate but gradually slow down until it comes to a rest.
If the mass of a moving object could be halved, what would happen to the inertia of the object?
a) It would remain unchanged. b) It would be quadrupled. c) It would be halved. d) It would be doubled.
A rocket's action is to push down on the ground with the force of its powerful engines, and the reaction is that the ground pushes the rocket upwards with an equal force. Which law best explains this event?
a) The Law of Universal Gravity b) Newton's 1st Law of Motion c) Newton's 2nd Law of Motion d) Newton's 3rd Law of Motion
Which statement describes the relationship between electric generators and electric motors?
a) Both electric generators and electric motors use motion in a magnetic field to produce electric current. b) Both electric generators and electric motors transform current from a magnetic field into mechanical energy. c) Generators transform mechanical energy into electrical energy whereas electric motors transform electric energy into mechanic d) Generators transform electrical energy into mechanical energy whereas electric motors transform mechanical energy into electr
Review the reactants in the chemical reaction shown. Na2O + H2O = How many atoms of oxygen must be present in the product of this reaction?
a) 1 b) 2 c) 4 d) 6
Which properties of metals best explain why they are often used in electrical wiring?
a) malleability and conductivity b) ductility and malleability c) ductility and conductivity d) luster and malleability
What is a benefit of ultraviolet radiation to humans?
a) electronic communication b) increased risk of cancer c) vitamin D formation d) sunburn
Which list includes mechanical waves only?
a) seismic waves, microwaves, X-rays b) infrared rays, ultraviolet rays, visible light c) radio waves, sound waves, waves in a rope d) seismic waves, sound waves, water waves
Which statement about the Law of the Conservation of Mass is true?
a) The mass of the products can be less than the mass of the reactants. b) The mass of the products must be equal to the mass of the reactants. c) The mass of the final products can be more than the mass of the reactants. d) The mass of the reactants must be more than the mass of the products.
The mass of chemical A is 2 g, and the mass of chemical B is 5 g. If the two chemicals are mixed and a chemical reaction takes place, what is the mass of the end products?
a) 2 g b) 3 g c) 7 g d) 10 g
How are the elements organized into the periodic table?
a) Elements are ordered by atomic weight. b) Elements are ordered by atomic number. c) Elements are arranged alphabetically. d) Elements are grouped by color.
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