MCQOPTIONS
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MCQOPTIONS
This section includes 425 Mcqs, each offering curated multiple-choice questions to sharpen your Graduate Aptitude Test (GATE) knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
Liquid fuels consist of hydrocarbons. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 102. |
In an isothermal process, |
| A. | there is no change in temperature |
| B. | there is no change in enthalpy |
| C. | there is no change in internal energy |
| D. | all of these |
| Answer» E. | |
| 103. |
An open cycle gas turbine works on |
| A. | Carnot cycle |
| B. | Otto cycle |
| C. | Joule's cycle |
| D. | Stirling cycle |
| Answer» D. Stirling cycle | |
| 104. |
A perpetual motion machine of the first kind is __________ according to first law of thermodynamics. |
| A. | possible |
| B. | impossible |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 105. |
One kg of carbon requires 8/3 kg of oxygen for its complete combustion and produces 11/3 kg of carbon dioxide gas. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» B. Disagree | |
| 106. |
A triatomic molecule consists of __________ atoms. |
| A. | one |
| B. | two |
| C. | three |
| D. | four |
| Answer» D. four | |
| 107. |
According to kinetic theory of gases, the velocity of molecules __________ with the increase in temperature. |
| A. | remains constant |
| B. | increases |
| C. | decreases |
| D. | None of these |
| Answer» C. decreases | |
| 108. |
When a gas is heated at constant volume |
| A. | its temperature will increase |
| B. | its pressure will increase |
| C. | both temperature and pressure will increase |
| D. | neither temperature nor pressure will increase |
| Answer» D. neither temperature nor pressure will increase | |
| 109. |
For a perfect gas, according to Boyle's law (where p = Absolute pressure, v = Volume, and T = Absolute temperature) |
| A. | p v = constant, if T is kept constant |
| B. | v/T = constant, if p is kept constant |
| C. | p/T = constant, if v is kept constant |
| D. | T/p = constant, if v is kept constant |
| Answer» B. v/T = constant, if p is kept constant | |
| 110. |
Which of the following is the correct statement of the second law of thermodynamics? |
| A. | It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work. |
| B. | It is impossible to transfer heat from a body at a lower temperature to a higher temperature, without the aid of an external source. |
| C. | There is a definite amount of mechanical energy, which can be obtained from a given quantity of heat energy. |
| D. | all of the above |
| Answer» E. | |
| 111. |
Boyle's law states that change of internal energy of a perfect gas is directly proportional to the change of temperature. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 112. |
Which of the following is the extensive property of a thermodynamic system? |
| A. | Pressure |
| B. | Volume |
| C. | Temperature |
| D. | Density |
| Answer» C. Temperature | |
| 113. |
The entropy of water at 0°C is assumed to be |
| A. | 1 |
| B. | 0 |
| C. | -1 |
| D. | 10 |
| Answer» C. -1 | |
| 114. |
When a fluid is allowed to expand suddenly into a vaccum chamber through an orifice of large dimensions, the process is known as free expansion process. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 115. |
The isothermal and adiabatic processes are regarded as |
| A. | reversible process |
| B. | irreversible process |
| C. | reversible or irreversible process |
| D. | none of these |
| Answer» B. irreversible process | |
| 116. |
Diesel cycle consists of __________ processes. |
| A. | two constant volume and two isentropic |
| B. | two constant pressure and two isentropic |
| C. | two constant volume and two isothermal |
| D. | one constant pressure, one constant volume and two isentropic |
| Answer» E. | |
| 117. |
The mass of flue gas per kg of fuel is the ratio of the |
| A. | mass of oxygen in 1 kg of flue gas to the mass of oxygen in 1 kg of fuel |
| B. | mass of oxygen in 1 kg of fuel to the mass of oxygen in 1 kg of flue gas |
| C. | mass of carbon in 1 kg of flue gas to the mass of carbon in 1 kg of fuel |
| D. | mass of carbon in 1 kg of fuel to the mass of carbon in 1 kg of flue gas |
| Answer» D. mass of carbon in 1 kg of fuel to the mass of carbon in 1 kg of flue gas | |
| 118. |
A process, in which the gas is heated or expanded in such a way that the product of its pressure and volume remains constant, is called |
| A. | isothermal process |
| B. | hyperbolic process |
| C. | adiabatic process |
| D. | polytropic process |
| Answer» C. adiabatic process | |
| 119. |
When gas is heated at constant pressure, the heat supplied is utilised in |
| A. | increasing the internal energy of gas |
| B. | doing some external work |
| C. | increasing the internal energy of gas and also for doing some external work |
| D. | none of the above |
| Answer» D. none of the above | |
| 120. |
The absolute zero pressure will be |
| A. | when molecular momentum of the system becomes zero |
| B. | at sea level |
| C. | at the temperature of - 273 K |
| D. | at the centre of the earth |
| Answer» B. at sea level | |
| 121. |
One kilowatt is equal to |
| A. | 1 N-m/s |
| B. | 100 N-m |
| C. | 1000 N-m/s |
| D. | 1 x 106 N-m/s |
| Answer» D. 1 x 106 N-m/s | |
| 122. |
Which of the following has the highest calorific value? |
| A. | Peat |
| B. | Lignite |
| C. | Bituminous coal |
| D. | Anthracite coal |
| Answer» E. | |
| 123. |
The blast furnace gas is a by-product in the production of pig iron in the blast furnace. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 124. |
The oxygen atom is __________ times heavier than the hydrogen atom. |
| A. | 2 |
| B. | 4 |
| C. | 8 |
| D. | 16 |
| Answer» E. | |
| 125. |
For the same maximum pressure and temperature, |
| A. | Otto cycle is more efficient than Diesel cycle |
| B. | Diesel cycle is more efficient than Otto cycle |
| C. | Dual cycle is more efficient than Otto and Diesel cycles |
| D. | Dual cycle is less efficient than Otto and Diesel cycles |
| Answer» C. Dual cycle is more efficient than Otto and Diesel cycles | |
| 126. |
An open system is one in which |
| A. | heat and work crosses the boundary of the system, but the mass of the working substance does not crosses the boundary of the system |
| B. | mass of the working substance crosses the boundary of the system but the heat and work does not crosses the boundary of the system |
| C. | both the heat and work as well as mass of the working substance crosses the boundary of the system |
| D. | neither the heat and work nor the mass of the working substance crosses the boundary of the system |
| Answer» D. neither the heat and work nor the mass of the working substance crosses the boundary of the system | |
| 127. |
The gas constant (R) is equal to the |
| A. | sum of two specific heats |
| B. | difference of two specific heats |
| C. | product of two specific heats |
| D. | ratio of two specific heats |
| Answer» C. product of two specific heats | |
| 128. |
One reversible heat engine operates between 1600 K and T₂ K and another reversible heat engine operates between T₂ K and 400 K. If both the engines have the same heat input and output, then temperature T₂ is equal to |
| A. | 800K |
| B. | 1000K |
| C. | 1200K |
| D. | 1400K |
| Answer» B. 1000K | |
| 129. |
The ratio of specific heat at constant pressure (cp) and specific heat at constant volume (cv) is always __________ one. |
| A. | equal to |
| B. | less than |
| C. | greater than |
| D. | None of these |
| Answer» D. None of these | |
| 130. |
The value of universal gas constant is same for all gases. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 131. |
The increase in entropy of a system represents |
| A. | increase in availability of energy |
| B. | increase in temperature |
| C. | decrease in pressure |
| D. | degradation of energy |
| Answer» E. | |
| 132. |
The entropy is a point function and thus it is a property of the same. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 133. |
According to kinetic theory of gases, the kinetic energy of translation of a molecule is proportional to |
| A. | T |
| B. | T |
| C. | 1/T |
| D. | 1/T |
| Answer» D. 1/T | |
| 134. |
The workdone in a free expansion process is zero. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 135. |
The heat absorbed or rejected by the working substance is given by (where ds = Increase or decrease of entropy, T = Absolute temperature, and dQ = Heat absorbed or rejected) |
| A. | δQ = T.ds |
| B. | δQ = T/ds |
| C. | dQ = ds/T |
| D. | none of these |
| Answer» B. δQ = T/ds | |
| 136. |
Which of the following process can be made reversible with the help of a regenerator? |
| A. | Constant pressure process |
| B. | Constant volume process |
| C. | Constant pvn process |
| D. | all of these |
| Answer» E. | |
| 137. |
The throttling process is __________ process. |
| A. | reversible |
| B. | irreversible |
| C. | reversible or irreversible |
| D. | None of these |
| Answer» C. reversible or irreversible | |
| 138. |
The value of one bar (in S. I. units) is equal to |
| A. | 1 x 102 N/m² |
| B. | 1 x 103 N/m² |
| C. | 1 x 104 N/m² |
| D. | 1 x 105 N/m² |
| Answer» E. | |
| 139. |
A process, in which the gas is heated or expanded in such a way that product of its pressure and volume remains constant, is called isothermal process. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 140. |
The atomic mass of an element is the number of times the atom of that element is heavier than the hydrogen atom. |
| A. | True |
| B. | False |
| C. | Can't say |
| D. | None of these |
| Answer» B. False | |
| 141. |
The heating of a gas at constant pressure is governed by |
| A. | Boyle's law |
| B. | Charles' law |
| C. | Gay-Lussac law |
| D. | Avogadro's law |
| Answer» C. Gay-Lussac law | |
| 142. |
According to Avogadro's law |
| A. | the product of the gas constant and the molecular mass of an ideal gas is constant |
| B. | the sum of partial pressure of the mixture of two gases is sum of the two |
| C. | equal volumes of all gases, at the same temperature and pressure, contain equal number of molecules |
| D. | all of the above |
| Answer» D. all of the above | |
| 143. |
The absolute pressure of a given mass of a perfect gas varies inversely as its volume, when the temperature remains constant. This statement is known as Boyle's law. |
| A. | Yes |
| B. | No |
| C. | Can't say |
| D. | None of these |
| Answer» B. No | |
| 144. |
The entropy may be expressed as a function of |
| A. | pressure and temperature |
| B. | temperature and volume |
| C. | heat and work |
| D. | all of these |
| Answer» B. temperature and volume | |
| 145. |
The throttling process is an irreversible steady flow expansion process. |
| A. | Correct |
| B. | Incorrect |
| C. | Can't say |
| D. | None of these |
| Answer» B. Incorrect | |
| 146. |
The temperature at which the volume of a gas becomes zero is called |
| A. | absolute scale of temperature |
| B. | absolute zero temperature |
| C. | absolute temperature |
| D. | none of these |
| Answer» C. absolute temperature | |
| 147. |
The amount of heat required to raise the temperature of 1 kg of water through one Kelvin is called |
| A. | specific heat at constant volume |
| B. | specific heat at constant pressure |
| C. | kilo-Joule |
| D. | none of these |
| Answer» D. none of these | |
| 148. |
The heat supplied to the gaS at constant volume is (where m = Mass of gas, cv = Specific heat at constant volume, cp = Specific heat at constant pressure, T2 - T1 = Rise in temperature, and R = Gas constant) |
| A. | mR(T2 - T1) |
| B. | mcv(T2 - T1) |
| C. | mcp(T2 - T1) |
| D. | mcp(T2 + T1) |
| Answer» C. mcp(T2 - T1) | |
| 149. |
If the carbon content in the bituminous coal is 78 to 81%, it is said to be coking bituminous coal. |
| A. | Agree |
| B. | Disagree |
| C. | Can't say |
| D. | None of these |
| Answer» C. Can't say | |
| 150. |
In open cycle gas turbine plants |
| A. | the indirect heat exchanger and cooler is avoided |
| B. | direct combustion system is used |
| C. | a condenser is used |
| D. | all of the above |
| Answer» E. | |