41) Two Liquid samples are poured into a beaker. As shown, the liquids don't mix with each other but form layers instead. Which of these statements about the two liquids is correct? A) They have the same mass. B) They have the same density. l C) They have different masses. D) They have different volumes 4) 42) According to the Big Bang theory of the origin of the universe, the universe has expanded from a hot dense state into a vast, cooler state. What would be considered scientific evidence supporting this theory? A) Galaxies are moving toward each other. B) Galaxies are moving away from each other. C) Cosmic background X-ray radiation was detected in space. D) The existence of common elements throughout the universe. 4) 43) 50 ml of water is poured into a beaker. 50 ml of another liquid is poured into the same beaker. The beaker is left undisturbed for some time. After some time, it is observed tha the liquid forms a clear layer on top of water. If the density of water is 1 g/cc, what could be the density of the second liquid? A) 0.8 g/cc B) 1 g/cc C) 1.8 g/cc D) 1.12 g/cc Travel by Car Distance (km) D-l N u A ul 0- O O O O O O o Time (hours) 4)) 44))Mary and Carl drove to the store to shop. Their trip to the store and back home is graphed here. What was their average speed on the way home from the store? A) 30 km/h B) 40 km/h C) 60 km/h D) Cannot tell from this data. 4) 45) Roseanne and Jackie were asked to design and create a paper airplane that would stay in the air for as long as possible They began by folding printer paper into four different planes. They then tested the flying times of the planes by throwing them and timing their flights with a stopwatch. They compared results and selected the plane with the longest time as their best design. The selection of their bestairplane design is considered in the design process. A) designing a solution B) implementing a design C) identifying a problem 4D) 46) Meteorologists want to design a system of instruments that will evaluate ocean currents, air temperatures, and wind speed in order to predict catastrophic weather such as hurricanes and cyclones. Before building a working system of the weather instruments, the scientists have built a prototype. The next step in deciding if their design is successful would be to A) modify their design. B) collect data using a prototype. C) evaluate the result of their system. D) draw conclusions from the use of the prototype. 4) 47) A is developed through the scientific method. and it can be modified or improved upon. It may be represented by a model. As seen here, three different models were used to represent atomic structure as ideas changed over time. A) hypothesis B) law C) prediction D) theory 4D) 48) Which of two factors influence the weight of an object due to gravitational pull? A) the mass and radius of the planet B) the shape and radius of the planet C) the rotation and mass of the planet D) the composition and rotation of the planet 41)) 49) Which flow diagram BEST explains the energy transformations that occur within an automobile running on diesel? A) chemical energy kinetic energy heat energy B) heat energy > kinetic energy > chemical energy C) kinetic energy > mechanical energy heat energy D) mechanical energy > heat energy > chemical energy 41)) 50) Which is the BEST definition of refraction? A) Light or sound waves change direction. B) Light or sound waves bounce off a medium. C) Light or sound waves move from one area to another. D) Light or sound waves increase their rate of dispersion. 41)) 51) Why does Earth orbit the Sun rather than any other body in the solar system? A) The mutual repulsions among all the planets hold Earth in its orbit. B) The Earth is closer to the Sun than other bodies in the solar system. C) The Sun is the most massive object; gravitational attraction is related to mass. D) The rotational motions of all the planets, including Earth, cause them to remain in its orbit around the Sun. 40) 52) What statement BEST describes a gas? A) Gases have definite shape and variable volume. B) Gases have variable shape and variable volume. C) Gases have a definite shape and definite volume. D) Gases have a variable shape and definite volume. 4) 53) What happens when light strikes a translucent object? A) All of the light passes through the object. B) All of the light is reflected by the object. C) None of the light can pass through the object. D) Some of the light passes through, and some of the Light is absorbed or scattered by the object.