ECAT Pre General Science Online Test With Answers

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ECAT Pre General Science Online Test

Sr. # Questions Answers Choice
1 Silicon is one of the mot commonly used: onductor Dielectric Insulator Semiconduction Both (B) and (C)
2 Tick the one which is not polymer solid:
 Zirconia Polythene Nylon Synthetic rubber None of these
3 Polymers are the chemical combination of carbon with: Nitrogen Oxygen Hydrogen All of these None of these
4 Examples of crystalline solids are: Cooper NaCl Zirconia Both (A) and (B) All of these
5 Examples of polymeric substances are: Plastic Synthetic rubbers Zirconia All of these Both (A) and (B)
6 A structure of polymeric solid is: An ordered structure A disordered structure Intermediate between order and disorder Any of these None of these
7 When relatively simple molecules are chemically combined into massive molecules, the reaction is called: Fission reaction Fusion reaction Polymerization Any of these None of these
8 Each atom in metal crystal: Remains fixed Vibrates about a fixed point Moves randomly Rotates about center of a crystal None of these
9 The smallest three dimensional basic structure is called as: An atom Unit cell Crystal lattice Polymer None of these
10 In crystalline solids, atoms are held about their equilibrium positions depending upon the strength of: Adhesive force Nuclear forces Inter atomic cohesive force Electromagnetic force None of these
11 The pattern of NaCl particles have a shape which is : Cubic Body centred cubic Simple cubic face centred Both (A) and (C)
12 The whole structure obtained by the repetition of unit cells is called: Crystal lattice Amorphous solid Polymeric solid Polysterne None of these
13 The temperature at which the vibrations become so great that structure of the Crystal breaks up, is called: Critical temparature Temperature of vaporization Melting point Both (A) and (C) Both (A) and (B)
14 Tick the one which is not a crystalline solid: Zirconia Glass Copper Ceramic solid An ionic compound
15 A unit cell is smallest basic structure which is: One dimensional Two dimensional Three dimensional Four dimensional None of these
16 The arrangement or molecules or atoms in a crystalline solid can be studied by using: Chemical methods Neutrons X-ray techniques Copper atoms Both (A) and (B)
17 An ordinary glass gradually softens into a 'paste -like' state before it becomes a very viscous liquid. It happens almost at: 800<sup>o</sup>C 500<sup>o</sup>C 300<sup>o</sup>C 100<sup>o</sup>C None of these
18 In a cubic crystal, All solids meet at: 60<sup>o</sup> 90<sup>o</sup> 109<sup>o</sup> 30<sup>o</sup> 10<sup>o</sup>
19 The pattern of crystalline solid is: One dimesional Two dimensional Three dimensional None of these Either (A) or (B)
20 Amorphous solids: Have definite melting points Are called glassy solids Have no definite melting point Both (B) and (C) Both (A) and (C)
21 The word amorphous means: Without any structure With definite structure Regular arrangement of molecules Both (B) and (C) None of these
22 The force which maintain the strict long-range order between atoms of a crystalline solid is the: Nuclear force Cohesive force Adhesive force Coulomb force None of these
23 The transition from solid state to liquid state is: Abrupt Slow Continous Discontinous Both (A) and (D)
24 The transition from solid to liquid is actually from: Order to disorder Disorder to order Order to order Disorder to disorder None of these
25 Each atom in a metal crystal vibrates about a fixed point with an amplitude that: Decrease the rise in temprature Is not affected by rise in temprature Increase with rise in temprature Both (B) and (C) None of these
26 Zirconia is classified as: Ceramic solid Ionic compound Metal Either (A) or (B) Either (B) or (C)
27 The solids are classified as: Metals Crystalline Amorphous Polymeric All except (A)
28 Crystalline solids are in the form of: Metals Ionic Compounds Ceramics Both (A) and (B) All of these
29 The basic circuit element in D.C. circuit is: A capacitor A resistor An inductor Both (A) and (C) Both (A) and (B)
30 The basic circuit element in A.C. circuits are: Resistor and capacitor Resistor and Inductor Capacitor only Both (B) and (C) None of these
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