MDCAT Physics Online Test With Answers

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MDCAT Physics Online Test

Sr. # Questions Answers Choice
1 Brownian motion confirms the truth of : Wave theory of light Boyle's law Kinetic theory of gases Adiabatic process
2 According to boyle's law, volume of a given mass of a gas is Inversely proportional mass at constant pressure Directly proportional to pressure at constant temprerature Inversely proportional pressure at constant temprature None of these
3 The pressure exerted on the walls on the vessel by gas molecules is defined as: Force per unit volume Energy per unit area mass per unit volume None of these
4 Change in momentum per second is: Product force and time Product of pressure and area Ratio of pressure and area None of these
5 The rate of change of momentum of a molecule is equal to: Pressure Work Density Force
6 If a molecule with momentum mv strikes a wall and rebound then the change in momentum will be: -2 mv Zero 2 mv mv
7 Pressure may be defined as_____per second per unit area: Change in force Change in momentum Change in energy Work done
8 Truth of kinetic energy theory is confirmed by: Diffusion of gases Brownian motion Both A and B None of these
9 Electromagnetic waves emitted by hot bodies are called: Photoelectrons Alpha rats Thermal radiation None of these
10 The nature of thermal radiation is similar to: Ultraviolet rays Light rays Both of them None of them
11 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
12 At constant temperature, if the density of the gas is increased, its pressure will: Decrease Increase Remain unchanged None of these
13 The motion of molecules in gases i: Orderly Random Circular All of these
14 In an ideal gas, the molecules have: Kinetic energy only Potential energy only Both KE and PE None of these
15 Which of the following does not have the same units: Work Heat Kinetic energy Power
16 The temperature scale approved in SI units is: Calslus scale Kelvin scale Fehrenhelt scale None of these
17 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
18 The only significant motion possessed by the mono-atomic gas molecules is: Translatory Rotatory Vibratory None of these
19 At constant temperature, if the volume of a given mass of a gas is doubled, then the density of gas becomes: Double Remains constant Half None of these
20 Real gases strictly obey gas laws at: High pressures and low temperatures Low pressures and high temperatures High pressures and &amp; temperatures None of these
21 A gas which strictly obeys the gas laws under all conditions of temperatures and pressure is called: Ideal gas Inert gas Real gas None of these
22 When two objects come to common temperature, the body is said to be in: Static equilibrium Dynamic equilibrium Thermal equilibrium None of these
23 Absolute zero is considered as that temperature at which: All liquids become gases All gases become liquids Water freezes None of these
24 Hotness and coldness of an object is represented in terms of: Heat Temperature Chemicial None of these
25 When heat is added to the system, the entropy change is: Positive Negative Zero None of these
26 Only those processes are probable to take place for which entropy os the system: Increases Remains constant Both A and B are correct None of above
27 No entropy change is associated with: Isothermal Adiabatic process Isobaric process None of them
28 Number of spark plugs needed in diesel engine is: Four Five Six None of these
29 The efficiency of a particle heat engine: can be 100% Cannot be 100% Is always zero None of these
30 Carnot cycle is: Reversible Irreversible Sometimes A, Sometimes B None of these
31 In which process the change in internal energy of the system is zero: Isochoric process Isobaric process Adiabatic process Isothermal process
32 The nature of thermal radiation is smaller to: Ultraviolet rays Light rays Both of them None of these
33 Avogadro number is known as number of molecules in: One kg of a substance Unit volume of a substance One mole of a substance None of these
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