ECAT Pre General Science Online Test With Answers

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ECAT Pre General Science Online Test

Sr. # Questions Answers Choice
1 On the compression stroke of the petrol engine, the inlet value is closed and the mixture is compressed adiabatically isothermally isochorcally isobarically
2 A typical four stroke petrol engine undergoes how many successive processes in each cycle one two three four
3 Since the absolute scale is independent of the property of the working substance, hence, can be applied at very high temperature very low temperature any one of them none of them
4 The state in which ice, water and vapour coexists in equilibrium is called zero degree celsius zero degree fahrenheit absolute zero 373 K
5 The unit of thermodynamical scale is centigrade fahrenheit kelvin none of them
6 The absolute temperature of the tripple point of water is 100<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span> 4<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°C</span> 373 K 273.16 K
7 The basis to define a temperature scale that is independent of material properties is provided by carbon cycle nitrogen cycle Carnot cycle irreversible cycle
8 Generally a temperature scale is established by using certain physical properties of a material which varies nonlinearly with temperature linearly with temperature either of them none of them
9 Generally a temperature scale is established by one fixed point two fixed point three fixed point four fixed point
10 The efficiency of carnot engine cannot be 100% or one unless cold reservoir is at 100 K 273 K 0 K -273 K
11 Efficiency of carnot engine is independent of the temperature of sink temperature of source nature of the working substances none of them
12 The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is 70% 100% 35% 38%
13 When the temperature of source and sink of a heat engine become equal entropy change will be Zero Max Min -ve
14
During the whole carnot cycle
 Thermal equilibrium is maintained mechanical equilibrium is maintained both the thermal and mechanical equilibriumis maintained both the thermal and mechanical equilibrium is not maintained
15 Which of the following can become a good temporarily magnet iron steel both of them none of them
16 Which of the following can become a good permanent magnet iron steel both of them none of them
17 In a soft iron, domains are easily oriented along external field and do not return to original random positions easily oriented along external field and readily returns to originally random position do no oriented along external field and also do not returns to originally random position none of them
18 Within each domain, the magnetic field of all the spinning electrons are parallel antiparallel perpendicular all of them
19 The size of the domain is such that they can contain 10<sup>2</sup>to 10<sup>4</sup>atoms 10<sup>4</sup> to 10<sup>8</sup>atoms 10<sup>8</sup>to 10<sup>12</sup>atoms 10<sup>12</sup>to 10<sup>16</sup>atoms
20 The domains are of macroscopic size of the order of centimeters meters millimeters nanomneters
21 Recent studies of ferromagnetism have shown that there exists in ferromagnetic substances small regions called tiny regions domains vectors none of them
22 The substance in which atoms cooperate with each other in such a way so as to exhibit a strong magnetic effect, are called diamagnetic substances ferromagnetic substances paramagnetic substances all of them
23 The substance in which atoms are so oriented that the field produced by spin and orbital motion of the electrons might add up to zero,are called diamagnetic substances ferromagnetic substances paramagnetic substances all of them
24 The substances in which, atom are so oriented that their fields support each other and the atoms behave like tiny magnets, are called diamagnetic substances ferromagnetic substances paramagnetic substances all of them
25 The charged nucleus of an atom itself spins its magnetic field equal to the field produced by orbital electrons greater than the field produced by orbital electrons much weaker than the field produced by orbital electrons none of these
26 An atom in which there is a resultant magnetic field, behaves like a tiny magnet and is called as magnetic magnetic dipole magnetic monopole none of them
27 The magnetism produced by electrons within an atom can arise from electrons orbiting the nucleus electrons posses a spin both motions none of these motions
28 Recently a complex crystalline structure known as Yetrium Barium Copper Oxide have been reported to become superconductor at 125 K 25 K 263 K 163 K
29 Any superconductor with critical temperature above 77 K, is referred as low temperature superconductor high temperature superconductor very low temperature superconductor none of them
30 The critical temperature of tin is 1.18 K 4.2 K 3.72 K 7.2 K
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