ECAT Physics Online Test With Answers

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ECAT Physics Online Test

Sr. # Questions Answers Choice
1 Each atom in metal crystal: Remains fixed Vibrates about a fixed point Moves randomly Rotates about center of a crystal None of these
2 The smallest three dimensional basic structure is called as: An atom Unit cell Crystal lattice Polymer None of these
3 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
4 The pattern of NaCl particles have a shape which is : Cubic Body centred cubic Simple cubic face centred Both (A) and (C)
5 The whole structure obtained by the repetition of unit cells is called: Crystal lattice Amorphous solid Polymeric solid Polysterne None of these
6 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)
7 Tick the one which is not a crystalline solid: Zirconia Glass Copper Ceramic solid An ionic compound
8 A unit cell is smallest basic structure which is: One dimensional Two dimensional Three dimensional Four dimensional None of these
9 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)
10 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
11 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>
12 The pattern of crystalline solid is: One dimesional Two dimensional Three dimensional None of these Either (A) or (B)
13 Amorphous solids: Have definite melting points Are called glassy solids Have no definite melting point Both (B) and (C) Both (A) and (C)
14 The word amorphous means: Without any structure With definite structure Regular arrangement of molecules Both (B) and (C) None of these
15 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
16 The transition from solid state to liquid state is: Abrupt Slow Continous Discontinous Both (A) and (D)
17 The transition from solid to liquid is actually from: Order to disorder Disorder to order Order to order Disorder to disorder None of these
18 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
19 Zirconia is classified as: Ceramic solid Ionic compound Metal Either (A) or (B) Either (B) or (C)
20 The solids are classified as: Metals Crystalline Amorphous Polymeric All except (A)
21 Crystalline solids are in the form of: Metals Ionic Compounds Ceramics Both (A) and (B) All of these
22 The basic circuit element in D.C. circuit is: A capacitor A resistor An inductor Both (A) and (C) Both (A) and (B)
23 The basic circuit element in A.C. circuits are: Resistor and capacitor Resistor and Inductor Capacitor only Both (B) and (C) None of these
24 Unless stated otherwise, when we speak of A.C. meter reading, we usualy mean: Peak value RMS value Instantaneous value Peak-to-peak value Both (A) and (C0
25 The length of rotating vector (on a certain scale) represents the: Peak value of alternating quantity RMS value of alternating quantity Instantaneous value of alternating quantity Either (B) or (C) Either (A) or (B)
26 A sinusoidally alternating voltage or current can be graphically represented by a: Vector Rotating vector Clockwise vector Anticlockwise voltage vector None of these
27 If 250V is the RMS value of alternative voltage, then its peak value Vowill be: 353.5V 250V 175V zero 400V
28 If we connect a A.C. volt meter to read A.C. voltage, It would read its: RMS value Instantaneous value Valued average over a cycle Zero Both (B) and (C)
29 The phase at the positive peak of an A.C. cycle is: 0<span style="font-family: &quot;Times New Roman&quot;, serif; font-size: 12pt; text-align: justify;">º</span><p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;"><o:p></o:p></span></p><p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;"><o:p></o:p></span></p> 90<span style="font-family: &quot;Times New Roman&quot;, serif; font-size: 12pt; text-align: justify;">º</span><p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;"><o:p></o:p></span></p> 180<span style="font-family: &quot;Times New Roman&quot;, serif; font-size: 12pt; text-align: justify;">º</span><p class="MsoNormal" style="text-align:justify"><span style="font-size:12.0pt; line-height:107%;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;"><o:p></o:p></span></p> 0 and<span style="font-size:12.0pt;line-height:107%; font-family:&quot;Plantagenet Cherokee&quot;,&quot;serif&quot;;mso-fareast-font-family:Calibri; mso-fareast-theme-font:minor-latin;mso-bidi-font-family:&quot;Times New Roman&quot;; mso-ansi-language:EN-US;mso-fareast-language:EN-US;mso-bidi-language:AR-SA">Ꮨ</span> <span style="font-size:12.0pt;line-height:107%; font-family:&quot;Plantagenet Cherokee&quot;,&quot;serif&quot;;mso-fareast-font-family:Calibri; mso-fareast-theme-font:minor-latin;mso-bidi-font-family:&quot;Times New Roman&quot;; mso-ansi-language:EN-US;mso-fareast-language:EN-US;mso-bidi-language:AR-SA">Ꮨ/2 and 3</span><span style="font-size:12.0pt;line-height:107%; font-family:&quot;Plantagenet Cherokee&quot;,&quot;serif&quot;;mso-fareast-font-family:Calibri; mso-fareast-theme-font:minor-latin;mso-bidi-font-family:&quot;Times New Roman&quot;; mso-ansi-language:EN-US;mso-fareast-language:EN-US;mso-bidi-language:AR-SA">Ꮨ/2</span>
30 The alternative voltage of current is actually measured by: Its RMS value Square root of its mean square value Instantaneous value Peak value Both (A) and (B)
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