NLN Science practice 60 Questions with Answer 2023,100% CORRECT

NLN Science practice 60 Questions with Answer 2023 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) 1⁄2 - CORRECT 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-12 - CORRECT 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) 1.0−2.0 - CORRECT 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) exothermic - CORRECT 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' Law - CORRECT 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 covalent - CORRECT ANSWER (C) ionic Which of the following wavelengths of visible light is best absorbed by chlorophyll? (A) 300nm (B) 495nm (C) 665nm (D) 550nm - CORRECT 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) consumers - CORRECT ANSWER (A) carnivores In which phase of mitosis do the chromosomes line up? (A) interphase (B) metaphase (C) prophase (D) anaphase - CORRECT ANSWER (B) metaphase Digestive enzymes can be found in which cellular organelle? (A) lysosomes (B) mitochondria (C) Golgi apparatus (D) ribosomes - CORRECT 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) fructose - CORRECT ANSWER (A) glucose The process of food traveling throughout the digestive system is known as (A) defecation. (B) contractions. (C) reverse peristalsis. (D) peristalsis. - CORRECT ANSWER (D) peristalsis. Accumulation of cholesterol leads to the hardening of the arteries. This is called (A) vasoconstriction. (B) venipuncture. (C) atherosclerosis. (D) hypertension. - CORRECT ANSWER (C) atherosclerosis. The stomach and mouth are connected by the (A) anus. (B) esophagus. (C) spinal column. (D) epiglottis. - CORRECT ANSWER (B) esophagus. Which of the following is not a type of muscle? (A) nervous muscle (B) smooth muscle (C) skeletal muscle (D) cardiac muscle - CORRECT ANSWER (A) nervous muscle The heart is composed of which type of tissue? (A) cardiac muscle (B) ligaments (C) smooth tendons (D) cartilage - CORRECT ANSWER (A) cardiac muscle The growth and development of bone is assisted by the use of vitamin D because vitamin D can (A) help the body excrete excess salt. (B) control sulfur and calcium levels in the blood. (C) aid in the absorption of calcium. (D) regulate levels of chloride ion. - CORRECT ANSWER (C) aid in the absorption of calcium. Synapses are the gaps between (A) nephrons. (B) neurons. (C) the cell membrane. (D) protons and neutrons. - CORRECT ANSWER (B) neurons. The small intestine contains a large quantity of villi that help (A) absorb acids and salvia from the mouth. (B) provide a greater surface for absorption of materials passing through the digestive tract. (C) produce saliva. (D) secrete hydrochloric acid to break down foods. - CORRECT ANSWER (B) provide a greater surface for absorption of materials passing through The process by which oxygen travels from the air into your lungs and then into your blood is called (A) hypertonic. (B) osmosis. (C) diffusion. (D) passive transport. - CORRECT ANSWER (C) diffusion. Which of the following are considered normal values for the measurements of a person's pulse and blood pressure? (A) 72 beats per minute and 120 over 80mm Hg (B) 100 beats per minute and 140 over 100mm Hg (C) 160 beats per minute and 100 over 70mm Hg (D) 55 beats per minute and 75 over 60mm Hg - CORRECT ANSWER (A) 72 beats per minute and 120 over 80mm Hg The retina transmits nerve impulses to the brain via the (A) optic nerve. (B) cranial nerve. (C) cardiac nerve. (D) esophagus. - CORRECT ANSWER (A) optic nerve. Which muscle pushes food through the digestive system? (A) renal (B) smooth (C) cardiac (D) rough - CORRECT ANSWER (B) smooth A person gets hit in the face with a puck while playing a game of ice hockey and fractures a bone. Which bone is a most likely candidate for this fracture? (A) mandible (B) rib (C) radius (D) femur - CORRECT ANSWER (A) mandible The word renal refers to the (A) liver. (B) gallbladder. (C) kidney. (D) lung. - CORRECT ANSWER (C) kidney. The bicuspid valve is found in the (A) heart. (B) veins. (C) lymph nodes. (D) anus. - CORRECT ANSWER (A) heart. Which of the following is not an accessory organ? (A) liver (B) pancreas (C) gallbladder (D) stomach - CORRECT ANSWER (D) stomach Bile is stored in the _____ and helps to digest _____ via _____. (A) liver . . . proteins . . . emulsification (B) liver . . . fats . . . dehydration synthesis (C) gallbladder . . . fats . . . emulsification (D) gallbladder . . . proteins . . . proteases - CORRECT ANSWER (C) gallbladder . . . fats . . . emulsification If a salt is added to water, which of the following is likely to occur? (A) The boiling point will increase and the freezing point will decrease. (B) The boiling point will increase and the freezing point will increase. (C) The boiling point will decrease and the freezing point will decrease. (D) The boiling point will decrease and the freezing point will increase. - CORRECT ANSWER (A) The boiling point will increase and the freezing point will decrease. A 60-watt light bulb is powered by a 110-volt power source. What is the current being drawn? (A) 1.83 amperes (B) 0.55 amperes (C) 50 amperes (D) 6,600 amperes - CORRECT ANSWER (B) 0.55 amperes A transverse wave does not have (A) a compression. (B) an amplitude. (C) a frequency. (D) a wavelength. - CORRECT ANSWER (A) a compression. A wave moves through its medium at 20m/ s with a wavelength of 4 m. What is the frequency of the wave? (A) 24 s −1 (B) 5 s −1 (C) 16 s −1 (D) 80 s −1 - CORRECT ANSWER (B) 5 s −1 Light hits a smooth mirror at an angle of 45 degrees. At what angle will the light be reflected? (A) 0 degrees (B) 180 degrees (C) 45 degrees (D) 90 degrees - CORRECT ANSWER (C) 45 degrees White light enters a prism and is broken up into the colors of the rainbow. This phenomenon is called (A) reflection. (B) diffraction. (C) dispersion. (D) refraction. - CORRECT ANSWER (C) dispersion. A laser beam of light is pointed through the air and then into a diamond. The beam of light then bends. This results from the process called (A) reflection. (B) diffraction. (C) dispersion. (D) refraction. - CORRECT ANSWER (D) refraction. An atom becomes an ion that possesses a negative charge. The atom must have (A) gained protons. (B) lost protons. (C) lost electrons. (D) gained electrons. - CORRECT ANSWER (D) gained electrons. Which of the following is not correctly paired up with its unit of measure? (A) current/ohms (B) voltage/volts (C) charge/coulombs (D) power/watts - CORRECT ANSWER (A) current/ohms The symbol Ω represents (A) current. (B) resistance. (C) amperes. (D) power. - CORRECT ANSWER (B) resistance. Which equation is written incorrectly, demonstrating a relationship that does not exist? (A) V= IR (B) P = IV (C) R= V/I (D) I = R/V - CORRECT ANSWER (D) I = R/V A set of lights decorates the window of a store. One of the light bulbs burns out, but the remaining light bulbs stay lit. The light bulbs are connected in (A) parallel. (B) series. (C) short circuit. (D) a 220-volt line. - CORRECT ANSWER (A) parallel. What is the voltage required to deliver a current of 1.0 amps to a device that has a resistance of 1.5 ohms? (A) 2.5 volts (B) 1.5 volts (C) 0.67 volts (D) 0.5 volts - CORRECT ANSWER (B) 1.5 volts Electrical potential is measured in (A) ohms. (B) watts. (C) amperes. (D) volts. - CORRECT ANSWER (D) volts. A 110-volt appliance draws 2.0 amperes. How many watts of power does it require? (A) 220 watts (B) 55 watts (C) 112 watts (D) 108 watts - CORRECT ANSWER (A) 220 watts A 110-volt hair dryer delivers 1,525 watts of power. How many amperes does it draw? (A) 167,750 amperes (B) 1,635 amperes (C) 1,415 amperes (D) 13.9 amperes - CORRECT ANSWER (D) 13.9 amperes A force of 10 N is delivered to an object for 1.5 seconds. What is the impulse directed on the object? (A) 15 N•s (B) 8.5N (C) 11.5 s (D) 6.7 N/s - CORRECT ANSWER (A) 15 N•s A 10-kg object moving at 5m/ s has an impulse acted on it causing the velocity to change to 15m/s. What was the impulse which was applied to the object? (A) 10 kg•m/s (B) 20 kg•m/s (C) 15 kg•m/s (D) 100 kg•m/s - CORRECT ANSWER (D) 100 kg•m/s An airplane travels 500 miles northeast and then, on the return trip, travels 500 miles southwest. Which of the following is true? (A) The displacement of the plane is 1,000 miles and the distance traveled is 0 miles. (B) The displacement of the plane is 1,000 miles and the distance traveled is 1,000 miles. (C) The displacement of the plane is 0 miles and the distance traveled is 0 miles. (D) The displacement of the plane is 0 miles and the distance traveled is 1,000 miles. - CORRECT ANSWER (D) The displacement of the plane is 0 miles and the distance traveled is 1,000 miles. The reaction 2NaI + Cl2→ 2NaCl + I2 demonstrates a (A) decomposition reaction. (B) synthesis reaction. (C) single replacement reaction. (D) double replacement reaction. - CORRECT ANSWER (C) single replacement reaction. An electromagnet is holding a 1,500-kg car at a height of 25 m above the ground. The magnet then experiences a power outage, and the car falls to the ground (without injuring anyone). Which of the following is false? (A) The car had a potential energy of 367.5 kJ. (B) 367.5 kJ of potential energy is converted to kinetic energy. (C) The car still has a potential energy of 367.5 kJ when it hits the ground. (D) The potential energy is converted to kinetic energy and then converted to sound energy. - CORRECT ANSWER (C) The car still has a potential energy of 367.5 kJ when it hits the ground.