Free Praxis II Science Exam Practice Questions
Q.1 What number moles of HCL must be added to sufficient water to structure 3 liters of a 2 M HCL result?
(A) 1 mol
(B) 2 mol
(C) 3 mol
(D) 6 mol
Q.2 A bit of paper that seems blue in daylight is lit up exclusively by a red light that is passed through a green channel. What shade does the paper show up under this light?
(A) Black
(B) Green
(C) Red
(D) Blue
Q.3 Which of the accompanying things will be pulled in to the north pole of a changeless magnet by an attractive energy?
(A) The north pole of an alternate perpetual magnet
(B) A bit of iron that is not a perpetual magnet
(C) A positively charged glass pole
(D) An adversely charged elastic pole
Q.4 If each of the accompanying dishes gives the same number of calories, which dish requires the most land to generate the food?
(A) Lentil soup and brown bread
(B) Steak and a prepared potato
(C) Corn tortilla and refried beans
(D) Red beans and rice
Q.5 Which of the accompanying is well on the way to cause an increase in the normal temperature of Earth's environment in future?
(A) Co2 from fossil powers
(B) Atomic warfare
(C) Dust mists from volcanoes
(D) Depletion of the Earth's ozone layer
Q.6 Polarized sunglasses are utilized to cut glare from daylight reflected at a looking point off autos, water, and different surfaces. Such sunglasses are a down to earth requisition of which of the accompanying physical standards?
(A) Brewster's law
(B) Coulomb's law
(C) Lenz's law
(D) Snell's law
Q.7 Which of the accompanying parts of the Sun is effectively visible just throughout a solar eclipse ?
(A) Photosphere
(B) Core
(C) Sunspots
(D) Corona
Q.8 Researchers accept that an overall cataclysmic occasion happened throughout the late Cretaceous period and that this occasion likely brought about which of the accompanying?
(A) The development of sea-going creatures onto land
(B) The sudden downfall of the dinosaurs
(C) The rise of Homo sapiens on the fields of Africa
(D) The first manifestation of vertebrates
Q.9 Earth's seasons are brought about by which of the accompanying?
(A) The tilt of the Earth's axis of revolution in respect to the ecliptic as Earth rotates around the Sun (B) The Earth's circle about the Sun as an oval instead of a round (C) The fluctuating measure of sunspot action (D) The turn of the Earth throughout a 24-hour dayQ.10 Which of the accompanying represents the best danger while being warmed in a school research center?
(A) Copper(ii) sulfate hydrate
(B) Mercury(ii) oxide
(C) Sodium chloride
(D) A mixture of iron and sulfur
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Correct Answers for Praxis II Science Exam with Explanation
Answer 1.(D) A convergence of 2 M means there are 2 moles of HCL for every liter of water. So 6 moles of HCL must be added to sufficient water to structure 3 liters of a 2 M HCL result.
Answer 2.(A) The green channel assimilates all shades with the exception of green, which it passes. Hence, the red light will be ingested by the channel, which will pass no light. The paper won't be enlightened, along these lines it will seem dark, paying little respect to its beginning shade.
Answer 3.(B) Iron is effortlessly charged. The point when iron is brought near a lasting magnet, the iron will get charged in such a route as to be pulled in to the changeless magnet.
Answer 4.(B) Vitality is lost as matter is exchanged starting with one trophic level then onto the next. It takes more land to process the vitality in steak than it does to handle the same measure of vitality in food from plants. Hence, (A), (C), and (D) are off base in light of the fact that these nourishments are determined from the essential makers (plants) only.
Answer 5.(A) Expanded carbon dioxide in the air will most likely bring about a dangerous atmospheric deviation. Nuclear warfare might more probable bring about an "atomic winter." Volcanoes would most likely cause cooling because of high air dust engrossing the Sun's beams so they can't achieve the ground. The consumption of the ozone layer will let more ultraviolet radiation through the environment however in itself ought not to result in warming.
Answer 6.(A) As stated by Brewster's law, reflected light will dependably be enraptured in a flat course, parallel to the reflecting surface. Polarized sunglasses are constructed to stop this reflected light and ton transmit light captivated just in the vertical heading.
Answer 7.(D) The Sun's corona has a great degree low thickness and is obvious just throughout a solar eclipse.
Answer 8.(B) The sudden vanishing of 90 percent of the dinosaur species happened about 60 million years ago. Recent synthetic proof focuses to a disastrous occasion, for example, an expansive effect, happening around then.
Answer 9.(A) Seasons are best illustrated as resulting from the Earth's axial tilt and not from distance varieties, sunspot activity, atmospheric transparency, or turn.
Answer 10.(B) Mercury(ii) oxide breaks down on warming to metallic mercury and oxygen. Mercury vapor that is given off is highly toxic when breathed in or retained through the skin, and presentation to mercury in a school ought to be significantly restricted if not disposed altogether.
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