MODULE 3 PART 1.5


Question Number. 41. Surface molecular attraction between two different molecules is.
Option A. adhesive.
Option B. gravitational.
Option C. cohesive.
Correct Answer is. adhesive.
Explanation. Cohesion is the property that causes like substances to cling together (e.g. water molecules, forming raindrops - from 'cohesion' meaning to stick together). Adhesion is the property that causes unlike substances to stick together (e.g. the raindrops stick, or 'adhere to' a washing line).




Question Number. 42. The atomic mass number is the number of.
Option A. protons plus electrons.
Option B. neutrons plus electrons.
Option C. protons plus neutrons.
Correct Answer is. protons plus neutrons.
Explanation. Mass Number is the number of protons + neutrons.




Question Number. 43. A catalyst in a chemical reaction does what?.
Option A. Can either speed it up or slow it down.
Option B. Speeds it up.
Option C. Slows it down.
Correct Answer is. Speeds it up.
Explanation. Official definition of 'catalyst': A substance that increases the rate of a chemical reaction by reducing the activation energy, but which is left unchanged by the reaction.




Question Number. 44. What is the number of electrons in the inner-most shell of an atom?.
Option A. 4.
Option B. 8.
Option C. 2.
Correct Answer is. 2.
Explanation. The inner shell of an atom has 2 electrons.




Question Number. 45. What form of heat is used to turn a solid into a gas?.
Option A. Sensible heat.
Option B. Specific heat.
Option C. Latent heat.
Correct Answer is. Latent heat.
Explanation. To change any state, the heat required is called 'latent heat'.




Question Number. 46. The heat required to change a liquid to a gas at constant temperature is the heat of.
Option A. fusion.
Option B. condensation.
Option C. vaporisation.
Correct Answer is. vaporisation.
Explanation. The heat required to turn a liquid into a gas (vaporise) is called the 'latent heat of vaporisation'.




Question Number. 47. An atom with a full outer shell is.
Option A. practically inert.
Option B. a good insulator.
Option C. a good conductor.
Correct Answer is. practically inert.
Explanation. An atom with a full outer shell is practically inert.




Question Number. 48. An element with a full valence shell is.
Option A. very reactive.
Option B. good conductor.
Option C. inert.
Correct Answer is. inert.
Explanation. An element with a full valence shell is inert.




Question Number. 49. A substance of two or more different atoms is.
Option A. a neutrino.
Option B. an isotope.
Option C. a chemical compound.
Correct Answer is. a chemical compound.
Explanation. A compound is two or more different atoms.




Question Number. 50. An atom with 5 electrons in its outer shell is.
Option A. trivalent.
Option B. pentavelent.
Option C. covalent.
Correct Answer is. trivalent.
Explanation. Valency is the number of electrons in the outer shell (up to 4) or 8 minus the number of electrons in the outer shell (over 4).

Comments

Post a Comment

Popular posts from this blog

What is AC Generator? Modern AC sources are, almost exclusively, induction generators, where the principle of work is based on electromagnetic induction. In this case, the electromagnetic current is obtained by rotating the conductors in the magnetic field. Today, almost all alternating current generators are three-phase. This means that in their movable part, which is called a rotor, they have three separate coils, placed between each other at an angle of 120◦, in which three EMC are phase-shifted precisely by 120◦, or in time sequence for a third period. Coils are usually indicated by the letters R, S and T, each of which defines a single phase. Depending on the binding of these coils, the transmission of electricity from the generator to the consumer is carried out with 4 or with 3 conductors. If at the beginnings of all the coils are bound at one point (the so-called zero point), then we are talking about star connection. In that case, the other ends of each coil, are connected wit
Read more

MODULE 3 CHAPTERR 3 QUIZ 1

03. Electrical Terminology .................................. Question Number. 1. If a photon radiating into an electronic device causes the production of an electron/hole pair, the device is known as a. Option A. light emitting diode. Option B. laser diode. Option C. photodiode. Correct Answer is. photodiode. Explanation. NIL .................................. Question Number. 2. Faraday's Law States that. Option A. the magnitude of the EMF is indirectly proportional to the rate of change of flux. Option B. the magnitude of the EMF is directly proportional to the magnetic flux. Option C. the magnitude of the EMF is directly proportional to the rate of change of flux. Correct Answer is. the magnitude of the EMF is directly proportional to the rate of change of flux. Explanation. NIL .................................. Question Number. 3. Which of the following is 1 Amp?. Option A. 1000 mA. ... Option B. 1000 kA. Option C. 1000 μA. Correct Answer is. 1000 mA. Explanation. NIL .
Read more

EASA MODULE 13 AIRCRAFT STRUCTURES AND SYSTEMS

                EASA MODULE 13 AIRCRAFT STRUCTURES AND SYSTEMS SUB-MODULE 01 THEORY OF FLIGHT  SUB-MODULE 03 AUTOFLIGHT                                                                            (ATA 22)  SUB-MODULE 04 COMMUNICATION / NAVIGATION                                       (ATA 23/34) SUB-MODULE 05 ELECTRICAL POWER                                                             (ATA 24) SUB-MODULE 06 EQUIPMENT AND FURNISHINGS                                        (ATA 25) SUB-MODULE 07 FLIGHT CONTROLS                                                                (ATA 27) SUB-MODULE 08 INSTRUMENTS                                                                        (ATA 31) SUB-MODULE 09 LIGHTS                                                                                      (ATA 33) SUB-MODULE 10 ON BOARD MAINTENANCE SYSTEMS                              (ATA 45) SUB-MODULE 11 AIR CONDITIONING AND CABIN PRESSURISATION       (ATA 21) SUB-MODULE 12 FIRE PROTECTION           
Read more