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ECAT Physics Online Test
| Sr. # | Questions | Answers Choice |
|---|---|---|
| 1 | Electrostatics is the branch of physics which
deals with the study of electro charges: |
<p class="MsoNormal"><span style="font-size:12.0pt;line-height:107%;font-family: "Times New Roman","serif"">At rest<o:p></o:p></span></p> <p class="MsoNormal"><span style="font-size:12.0pt;line-height:107%;font-family: "Times New Roman","serif"">At rest under the action of electric forces<o:p></o:p></span></p> <p class="MsoNormal"><span style="font-size:12.0pt;line-height:107%;font-family: "Times New Roman","serif"">In motion under the action of electric forces<o:p></o:p></span></p> <p class="MsoNormal"><span style="font-size:12.0pt;line-height:107%;font-family: "Times New Roman","serif"">In motion<o:p></o:p></span></p> <p class="MsoNormal"><span style="font-size:12.0pt;line-height:107%;font-family: "Times New Roman","serif"">At rest under the action of nuclear forces<o:p></o:p></span></p> |
| 2 | In case of two identical charges placed certain
distance apart, the electric field lines are: |
<p class="MsoNormal"><span style="font-size:12.0pt;line-height:107%;font-family: "Times New Roman","serif"">Straight lines<o:p></o:p></span></p> <p class="MsoNormal"><span style="font-size:12.0pt;line-height:107%;font-family: "Times New Roman","serif"">Sine curves<o:p></o:p></span></p> <p class="MsoNormal"><span style="font-size:12.0pt;line-height:107%;font-family: "Times New Roman","serif"">Curved<o:p></o:p></span></p> <p class="MsoNormal"><span style="font-size:12.0pt;line-height:107%;font-family: "Times New Roman","serif"">Both (A) and (B)<o:p></o:p></span></p> <p class="MsoNormal"><span style="font-size:12.0pt;line-height:107%;font-family: "Times New Roman","serif"">None of these<o:p></o:p></span></p> |
| 3 | Field lines are closer to each other in the region where the field is: | <p class="MsoNormal"><span style="font-size:12.0pt;line-height:107%;font-family: "Times New Roman","serif"">Stronger<o:p></o:p></span></p> <p class="MsoNormal"><span style="font-size:12.0pt;line-height:107%;font-family: "Times New Roman","serif"">Weaker<o:p></o:p></span></p> <p class="MsoNormal"><span style="font-size:12.0pt;line-height:107%;font-family: "Times New Roman","serif"">Much weaker<o:p></o:p></span></p> <p class="MsoNormal"><span style="font-size:12.0pt;line-height:107%;font-family: "Times New Roman","serif"">Absent<o:p></o:p></span></p> <p class="MsoNormal"><span style="font-size:12.0pt;line-height:107%;font-family: "Times New Roman","serif"">None of these<o:p></o:p></span></p> |
| 4 | Electric field lines emerge from the charge in: | <p class="MsoNormal"><span style="font-size:12.0pt;line-height:107%;font-family: "Times New Roman","serif"">One dimension<o:p></o:p></span></p> <p class="MsoNormal"><span style="font-size:12.0pt;line-height:107%;font-family: "Times New Roman","serif"">Two dimensions<o:p></o:p></span></p> <p class="MsoNormal"><span style="font-size: 12pt; line-height: 107%; font-family: "Times New Roman", serif;">Three dimensions<b><o:p></o:p></b></span></p> <p class="MsoNormal"><span style="font-size:12.0pt;line-height:107%;font-family: "Times New Roman","serif"">Four dimensions<o:p></o:p></span></p> <p class="MsoNormal"><span style="font-size:12.0pt;line-height:107%;font-family: "Times New Roman","serif"">None of them<o:p></o:p></span></p> |
| 5 | The value of relative permittivity of different dielectrics are: | <p class="MsoNormal"><span style="font-family: "Times New Roman", serif; font-size: 16px;">Equal</span></p> <p class="MsoNormal"><span style="font-family: "Times New Roman", serif; font-size: 16px;">Different</span></p> <p class="MsoNormal"><span style="font-family: "Times New Roman", serif; font-size: 16px;">Greater than one</span></p> <p class="MsoNormal"><span style="font-family: "Times New Roman", serif; font-size: 16px;">Smaller than one</span></p> <p class="MsoNormal"><b><span style="font-size:12.0pt;line-height:107%;font-family:"Times New Roman","serif"">Both (B) and (C)<o:p></o:p></span></b></p> |
| 6 | The value of E0in coulomb's law is: | 9 x 10<sup>9</sup>Nm<sup>2</sup>C<sup>-2</sup> 8.85 x 10<sup>-12</sup>C<sup>2</sup>N<sup>-1</sup>m<sup>-2</sup> 8.85 x 10<sup>-12</sup>Nm<sup>2</sup>C<sup>-2</sup> 9 x 10<sup>9</sup>C<sup>2</sup>N<sup>-1</sup>m<sup>-2</sup> |
| 7 | If the distance between two charges is doubled, the force between them will become: | Double Half Three times One fourth One third |
| 8 | Average KE of a gas molecule has: | Direct relation with absolute temperature and inverse relation with pressure Direction relation with both absolute temperature and pressure Inverse relation with both absolute temperature and pressure None of these |
| 9 | Gas constant per molecule is called: | Universal gas constant Stefen's constant Boltzmann constant Gravitation constant |
| 10 | Tick the correct pair when M denotes the molecular mass and other symbols carry usual meanings: | N = nN<sub>A</sub>m = MN<sub>A</sub> n = N N<sub>A</sub>, M = mN<sub>A</sub> M = N<sub>A</sub>/N , N<sub>A</sub>= m/n N = nN<sub>A</sub>, M = mN<sub>A</sub> |
| 11 | In the formula P = N0KT, N0denotes: | Number of molecules per unit per volume Number of moles Number of molecules None of these |
| 12 | The volume of universal gas constant R is: | 8.314 J/K mole K 8314 J/K mole K 8.314 J/mole K None of these |
| 13 | If the formula PV = nRT, n denotes: | Number of molecules per unit volume Number of moles Number of molecules None of these |
| 14 | While deriving equation of pressure by kinetic theory of gases, we take into account: | Only linear motion of molecules Only rotational motion Only vibratory motion All of these |
| 15 | Pressure applied at any point of gas at rest is transmitted equally to all parts of the gas. This is the statement of: | Newton's second law Pascal's law Carnot theorem Second law of thermodynamics |
| 16 | If denotes the total number of molecules in cubic vessel such that m is mass of each milecule and I is length of each side of vessel, then mN/I3gives the: | Force Density Work done Pressure |
| 17 | The rate of change of momentum of a molecule is equal to: | Pressure Work Density Force |
| 18 | If a molecule with momentum mv strikes a wall and rebound then the change in momentum will be: | -2 mv Zero 2 mv mv |
| 19 | Pressure may be define as _______ per second per unit area: | Change in force Change in momentum Change in energy Work done |
| 20 | Truth of kinetic energy is confirmed by: | Diffusion of gases Brownian motion Both A and B None of these |
| 21 | Electromagnetic waves emitted by hot bodies are called: | Photoelectrons Alpha rays Thermal radiation None of these |
| 22 | The nature of thermal radiation is similar to: | Ultraviolet rays Light rays Both of them None of these |
| 23 | The relationship between Boltzmann constant k with R and NAis given as: | k = RN<sub>A</sub> k =R/N<sub>A</sub> k = NR/N<sub>A</sub> None of these |
| 24 | At constant temperature, if the density of the gas is increased, its pressure will: | One kg of a substance Unit volume of a substance One mole of a substance None of these |
| 25 | The motion of molecules in gases is: | Orderly Random Circular All of these |
| 26 | In an ideal gas, the molecules have: | Kinetic energy only Potential energy only Both KE and PE None of these |
| 27 | Which of the following does not have the same units: | Work Heat Kinetic energy Power |
| 28 | The temperature scale approved in SI units is: | Celsius scale Kelvin scale Fehrenheit scale None of these |
| 29 | In the theory of dimensional analysis, heat may be properly represented by: | ML<sup>2</sup>T<sup>-2</sup> MT<sup>-2</sup> ML<sup>-1</sup>T<sup>-1</sup> None of these |
| 30 | The only significant motion possessed by the mono-atomic gas represented is: | Translatory Rotatory Vibratory None of these |
