SCIENCE NLN PRACTICE QUESTIONS AND ANSWERS NEW UPDATE 2022

SCIENCE NLN PRACTICE QUESTIONS AND ANSWERS NEW UPDATE 2022 To be isotopes, two atoms of the same element must have a different number of (A) neutrons. (B) protons. (C) electrons. (D) quarks.Correct Answer- (A) neutrons. Depending on its environment, a substance that can act as either an acid or a base is described as (A) amphoteric. (B) an isomer. (C) hydrolytic. (D) a polymer.Correct Answer- (A) amphoteric. A certain substance is not broken down in a chemical reaction. The substance is most likely (A) a compound. (B) an aqueous solution. (C) an element. (D) a heterogeneous mixture.Correct Answer- (C) an element. A hydrogen ion concentration of 1 × 10−7 M in a solution is considered (A) basic. (B) alkali. (C) acidic. (D) neutral.Correct Answer- (D) neutral. The radioactive isotope I-131 has a half-life of 8 days. What fraction of a sample of I-131 will remain after 24 days? (A) 1⁄4 (B) 1⁄16 (C) 1⁄8 (D) 1⁄2Correct Answer- (C) 1⁄8 Which of the following particles/rays is not a type of radioactive emanation? (A) alpha particle (B) beta particle (C) gamma ray (D) carbon-12Correct Answer- (D) carbon-12 The strongest acid can be found in which of the following pH ranges? (A) 11.1−12 (B) 7.1−8.2 (C) 4.5−5.7 (D) 1.0−2.0Correct Answer- (D) 1.0−2.0 The symbol K on the periodic table stands for (A) potassium. (B) calcium. (C) carbon. (D) phosphorus.Correct Answer- (A) potassium. Which of the following reactions releases heat energy? (A) double replacement (B) decomposition (C) endothermic (D) exothermicCorrect Answer- (D) exothermic Which gas law states that the volume of a gas is inversely proportional to the pressure? (A) Ideal Gas Law (B) Boyle's Law (C) Combined Gas Law (D) Charles' LawCorrect Answer- (B) Boyle's Law What type of bond is created when bromine and magnesium are reacted to form MgBr2? (A) polar covalent (B) metallic (C) ionic (D) nonpolar covalentCorrect Answer- (C) ionic Which of the following wavelengths of visible light is best absorbed by chlorophyll? (A) 300nm (B) 495nm (C) 665nm (D) 550nmCorrect Answer- (C) 665nm The xylem vessels of a plant are responsible for carrying (A) water up through the plant. (B) light energy to the leaves. (C) chlorophyll to the leaves. (D) oxygen into the leaves.Correct Answer- (A) water up through the plant. When placed in distilled water, a human red blood cell (A) shrivels up. (B) neither shrinks nor swells. (C) takes up more salts to balance all concentrations. (D) swells to a larger size.Correct Answer- (D) swells to a larger size. During plant cell replication, the division of the cytoplasm is called (A) cytohydrolysis. (B) cytokinesis. (C) plasmolysis. (D) cytoplasmosis.Correct Answer- (B) cytokinesis. Which of the following are classified as animals that eat only meat? (A) carnivores (B) herbivores (C) decomposers (D) consumersCorrect Answer- (A) carnivores In which phase of mitosis do the chromosomes line up? (A) interphase (B) metaphase (C) prophase (D) anaphaseCorrect Answer- (B) metaphase Digestive enzymes can be found in which cellular organelle? (A) lysosomes (B) mitochondria (C) Golgi apparatus (D) ribosomesCorrect Answer- (A) lysosomes The process by which an enzyme acts on the substrate can be described by the (A) lock-and-key model. (B) enzyme-and-substrate model. (C) enzyme folding model. (D) catalytic model.Correct Answer- (A) lock-and-key model. When an organism contains chloroplast in its cells, the color of the organism would most likely be (A) orange. (B) brown. (C) yellow. (D) green.Correct Answer- (D) green. In most living things, all of the following groups of chemicals can be found naturally EXCEPT (A) lipids. (B) synthetic polymers. (C) nucleic acids. (D) carbohydrates.Correct Answer- (B) synthetic polymers. Carbohydrates and starches must be changed to ______ so that they can be used by cells. (A) glucose (B) glycerin (C) sucrose (D) fructoseCorrect Answer- (A) glucose CONTINUES.....