Definitions MCQ

Test your knowledge with important Definitions MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Definitions MCQs at Bissoy

• Consider two rocket engines A and B with A having a specific impulse of 242s and B having a specific impulse of 150s. What can be said about their efficiency?
  ক

  Both A and B are equally efficient

  খ

  A is more efficient than B

  গ

  B is more efficient than A

  ঘ

  Efficiency doesn’t depend on specific impulse
• Given that the total impulse is 25000 Ns and specific impulse is 300s, find out the effective propellant mass for a burn duration of 8s.
  ক

  17 kg

  খ

  8.5 kg

  গ

  34 kg

  ঘ

  68 kg
• For a rocket, the specific impulse was found to be 250s. Given that the thrust force is constant and assuming gravity-free and drag-free conditions, what will the thrust force be for a mass flow rate of the form (4t2-3t) kg/s and a burn duration of 3s?
  ক

  18375 N

  খ

  12426 N

  গ

  25234 N

  ঘ

  15595 N
• Suppose the thrust force of a rocket varies with time t as F = 250(3t2 + 2t). Then find out the total impulse for a burn duration of 4s.
  ক

  10000 Ns

  খ

  20000 Ns

  গ

  40000 Ns

  ঘ

  80000 Ns
• For a constant thrust of 6000 N, find the total impulse for the burning time of 3s.
  ক

  36000 Ns

  খ

  18000 Ns

  গ

  9000 Ns

  ঘ

  0 Ns
• What is the typical liquid propellant feed system used in space launch vehicles?
  ক

  The Gas pressure feed system

  খ

  Pump-fed system

  গ

  Gravity assisted feed system

  ঘ

  No feed system is used
• Which of the following pressure feed systems is mostly used in attitude control of liquid propellant rocket engine with more than one thrust chamber per engine?
  ক

  The Gas pressure feed system

  খ

  Pump-fed system

  গ

  Gravity assisted feed system

  ঘ

  No feed system is used
• What is the range of temperature of reaction product gases in a rocket engine?
  ক

  500 to 1700 °C

  খ

  1700 to 2500 °C

  গ

  2500 to 4100 °C

  ঘ

  4100 to 6900 °C
• Which of the following is not a valid classification of rocket engines based on their energy source?
  ক

  Chemical

  খ

  Geothermal

  গ

  Solar

  ঘ

  Nuclear
• Which of the following is not an air-breathing engine?
  ক

  Turbojet

  খ

  Turbofan

  গ

  Rocket

  ঘ

  Scramjet
• Thermostat is a combination of ___ and ___
  ক

  therm, ostat

  খ

  thermo, stat

  গ

  therm, stat

  ঘ

  therms, tat
• What does LASER stand for?
  ক

  Light Amplification of Stimulated Emission of Radiation

  খ

  Light Amplification of Stimulated Emission by Radiation

  গ

  Light Amplification by Stimulated Emission of Radiation

  ঘ

  Light Amplification by Stimulated Emission by Radiation
• A _____ is a representation of an object on another surface.
  ক

  drawing

  খ

  image

  গ

  illustration

  ঘ

  picture
• Which of these is a representation of an object drawn by lines?
  ক

  Drawing

  খ

  Picture

  গ

  Illustration

  ঘ

  Photo
• Which of these must be eliminated by a writer while defining?
  ক

  Facts

  খ

  Knowledge

  গ

  Prejudices

  ঘ

  Information
• A definition excludes everything which is unimportant.
  ক

  True

  খ

  False
• A definition consists of how many parts?
  ক

  Two

  খ

  Three

  গ

  Four

  ঘ

  Five
• A definition usually consists of ___ statement(s).
  ক

  three

  খ

  one

  গ

  four

  ঘ

  five
• Which of these terms do not need a definition?
  ক

  Principles

  খ

  Concepts

  গ

  Processes

  ঘ

  Names
• Information is required to describe an object.
  ক

  True

  খ

  False
• Which of the following statements is true for the diffraction patterns in the crystal lattice?
  ক

  Diffraction patterns possess a center of symmetry

  খ

  Diffraction patterns doesn’t have center of symmetry

  গ

  Diffraction patterns are linear space

  ঘ

  Diffraction patterns contains α-rays
• What is the value of Z (no. of the atoms) in the α-Fe structure?
  ক

  1

  খ

  2

  গ

  3

  ঘ

  4
• In the diffraction of X-rays by the set of a plane, in some cases the resultant intensity is zero, these are caused by absent reflections, what is the number absent reflection is divided?
  ক

  2

  খ

  10

  গ

  50

  ঘ

  100
• Labelling of the lattice planes is done by using ___________
  ক

  Bragg’s indices

  খ

  Miller indices

  গ

  Stockbarger indices

  ঘ

  Dalton’s indices
• Lattice planes which are introduced with Bragg’s Law are defined from which of the following factors?
  ক

  Shape and concentration of the crystal

  খ

  Solubility and concentration of the crystal

  গ

  Number of unit cell present in the crystal

  ঘ

  Shape and dimensions of the unit cell of the crystal
• For the crystal structures how many numbers of Bravais lattice are there?
  ক

  3

  খ

  6

  গ

  14

  ঘ

  24
• The unit cell in which the top face is partially sheared relative to the bottom face and in a direction parallel to one of the box edges is known as_______
  ক

  Orthorhombic unit cell

  খ

  Monoclinic unit cell

  গ

  Triclinic unit cell

  ঘ

  Trigon unit cell
• Crystals in which the number of the combinations of the symmetric molecule is limited to 32 is known as _________
  ক

  Crystallographic unit cell

  খ

  Crystallographic point groups

  গ

  Crystallographic crystals

  ঘ

  Crystallographic atoms
• The smallest repetitive unit of the crystal structure is known as____________
  ক

  Atoms

  খ

  Compound

  গ

  Unit cell

  ঘ

  Lattice
• When a polydentate ligand uses all its donor atoms simultaneously to bond to a single metal ion, it is said to be a _______ ligand.
  ক

  unidentate

  খ

  didentate

  গ

  chelate

  ঘ

  ambidentate