MCQOPTIONS
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MCQOPTIONS
This section includes 205 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
Thermal radiations are electromagnetic wave belonging to |
| A. | Ultraviolet |
| B. | Visible region |
| C. | Gamma region |
| D. | Infrared region |
| Answer» E. | |
| 102. |
Water is used as coolant in the radiator of a car engine because it |
| A. | Has low density |
| B. | Has high specific heat |
| C. | Has low boiling point |
| D. | Is easily available |
| Answer» C. Has low boiling point | |
| 103. |
The most comfortable value for RH is |
| A. | 10% |
| B. | 30% |
| C. | 50% |
| D. | 100% |
| Answer» D. 100% | |
| 104. |
At 0K the velocity of the molecules is |
| A. | Zero |
| B. | Infinity |
| C. | Very large |
| D. | Of any value |
| Answer» B. Infinity | |
| 105. |
The unit of the coefficient of linear expansion is |
| A. | m |
| B. | / C |
| C. | m / C |
| D. | C |
| Answer» C. m / C | |
| 106. |
The amount of heat required to raise the tempreature of a body through 1 k is called, its |
| A. | Water equvalent |
| B. | Specific heat |
| C. | Thermal capacity |
| D. | Entropy |
| Answer» B. Specific heat | |
| 107. |
A circular disc of copper has a symmetrical hole at its centre. The disc is uniformly heated. The diameter of the hole will |
| A. | Increase |
| B. | Decrease |
| C. | Remain the same |
| D. | None of these |
| Answer» B. Decrease | |
| 108. |
When water is heated from 0 to 10 C, its volume |
| A. | Decreases |
| B. | Increases |
| C. | Remain unchanged |
| D. | First decreases and then increases |
| Answer» E. | |
| 109. |
If the temperature scale is changed from C to F the numerical value of specific heat will |
| A. | Increase |
| B. | Decrease |
| C. | Remain unchanged |
| D. | Nothing can be said |
| Answer» C. Remain unchanged | |
| 110. |
The correct value of 0 C on the kelvin scale is |
| A. | 273K |
| B. | 27.315 K |
| C. | 275.15 K |
| D. | 270 K |
| Answer» C. 275.15 K | |
| 111. |
A temperature at which both the fahrenheit and the centigrade scales have the same value is |
| A. | -60 |
| B. | -40 |
| C. | -20 |
| D. | 0 |
| Answer» C. -20 | |
| 112. |
If a substance contracts on heating, its co-efficient of linear expansion is |
| A. | +ve |
| B. | -ve |
| C. | Zero |
| D. | Infinity |
| Answer» C. Zero | |
| 113. |
Which of the following substances has greatest specific heat? |
| A. | Iron |
| B. | Water |
| C. | Copper |
| D. | Mercury |
| Answer» C. Copper | |
| 114. |
Glaciers always melt at the ........first. |
| A. | Top surface |
| B. | Sides |
| C. | Bottom |
| D. | Middle surface |
| Answer» D. Middle surface | |
| 115. |
The unit of latent heat is |
| A. | cal-g |
| B. | cal / C |
| C. | cal / g |
| D. | none of these |
| Answer» D. none of these | |
| 116. |
One Joule is approximately equal to |
| A. | 0.28 cal |
| B. | 0.32 cal |
| C. | 0.24 cal |
| D. | 4.2 cal |
| Answer» D. 4.2 cal | |
| 117. |
Mercury thermometers can be used to measure temperature up to |
| A. | 260 C |
| B. | 100 C |
| C. | 360 C |
| D. | 500 C |
| Answer» D. 500 C | |
| 118. |
Which of the following is the example of ideal black body? |
| A. | Kajal |
| B. | Black board |
| C. | A pin hole box |
| D. | None of these |
| Answer» D. None of these | |
| 119. |
The speed of light with the rise in the temperature of the medium |
| A. | Increases |
| B. | Decreases |
| C. | Remains unaltered |
| D. | Drops suddenly |
| Answer» D. Drops suddenly | |
| 120. |
What is the principle by which a cooling system (Radiator) in a motor car works? |
| A. | Conduction only |
| B. | Convection |
| C. | Radiation only |
| D. | Both conduction and radiation |
| Answer» C. Radiation only | |
| 121. |
The saturated vapour pressure of water at 100 C |
| A. | 750 mm of Hg |
| B. | 760 mm of Hg |
| C. | 76 mm of Hg |
| D. | 7.6 mm of Hg |
| Answer» C. 76 mm of Hg | |
| 122. |
A metal ball is being weighed in a liquid whose temperature is raised continuously. Then the apparent weight of the ball |
| A. | Remain unchanged |
| B. | Increases |
| C. | Decreases |
| D. | Changes erractically |
| Answer» C. Decreases | |
| 123. |
A temperature difference of 25 C is equivalent to a temperature difference of |
| A. | 25 F |
| B. | 45 F |
| C. | 67 F |
| D. | 77 F |
| Answer» C. 67 F | |
| 124. |
Some quantity of water at room temperature is placed in an open pan and allowed to evaporate. After sometime the temperature of water |
| A. | Decreases slightly |
| B. | Increases slightly |
| C. | Remains unchanged |
| D. | None of these |
| Answer» B. Increases slightly | |
| 125. |
If the temperature of a patient is 40 C his temperature on fahrenheit will be |
| A. | 72 F |
| B. | 96 F |
| C. | 100 F |
| D. | 104 F |
| Answer» E. | |
| 126. |
The gas thermometers is more sensitive than the liquid thermometre because gases |
| A. | Expand more than liquids |
| B. | Do not change their states easily |
| C. | Are much lighter |
| D. | Are easy to obtain |
| Answer» B. Do not change their states easily | |
| 127. |
The temperature of a gas is measured with a |
| A. | Platinum resistance thermometer |
| B. | Pyrometer |
| C. | Gas thermometer |
| D. | Vapour pressure thermometer |
| Answer» C. Gas thermometer | |
| 128. |
Which of the following is the correct device for the detection of thermal radiation? |
| A. | Constant volume gas thermometer |
| B. | Liquid-in-glass thermometer |
| C. | Thermopile |
| D. | None of the above |
| Answer» D. None of the above | |
| 129. |
Heat is transmitted from higher to lower temperature through acrual mass motion of the molecules in |
| A. | Conduction |
| B. | Convection |
| C. | Radiation |
| D. | All of these |
| Answer» C. Radiation | |
| 130. |
If an ideal gas i isothermally expanded, its internal energy will |
| A. | Increase |
| B. | Decrease |
| C. | Remain the same |
| D. | None of these |
| Answer» D. None of these | |
| 131. |
A gas in a metallic cylinder is suddenly compressed by a piston which is maintained at the same position with the passage of time the pressure of air |
| A. | Increases |
| B. | Decreases |
| C. | Remains the same |
| D. | None of these |
| Answer» C. Remains the same | |
| 132. |
Internal energy of a perfect gas is independent of |
| A. | Pressure |
| B. | Volume |
| C. | Temperature |
| D. | None of these |
| Answer» E. | |
| 133. |
At absolute zero temperature, the kinetic energy of the molecules |
| A. | Becomes maximum |
| B. | Becomes minimum |
| C. | Remains constant |
| D. | Becomes zero |
| Answer» E. | |
| 134. |
If a bimetallic strip is heated it will |
| A. | Bend towards the metal with lower thermal expansion co-efficient |
| B. | Bend towards the metal with higher thermal expansion co-officient |
| C. | Not bend at all |
| D. | Twist itself into helix |
| Answer» B. Bend towards the metal with higher thermal expansion co-officient | |
| 135. |
With rise of boiling point of a water the latent heat of steam |
| A. | Decreases |
| B. | Increases |
| C. | Dose not change |
| D. | None of these |
| Answer» B. Increases | |
| 136. |
A sphere, a cube and thin circular plate, all having the same mass and made of the same material are heated to the same temperature and then allowed to cool, which of them cools fastest? |
| A. | Sphere |
| B. | Cube |
| C. | Circular plate |
| D. | All at the same rate |
| Answer» D. All at the same rate | |
| 137. |
Device used to measure very high temperature is |
| A. | Pyrometer |
| B. | Thermometer |
| C. | Bolometer |
| D. | Calorimeter |
| Answer» B. Thermometer | |
| 138. |
An instrument used to measure humidity is |
| A. | Anemometer |
| B. | Hygrometer |
| C. | Thermometer |
| D. | Pyrheliometer |
| Answer» C. Thermometer | |
| 139. |
At upper atmosphere, an astronaut feels |
| A. | Extremely hot |
| B. | Slightly hotter |
| C. | Extremely cool |
| D. | Slightly cooler |
| Answer» D. Slightly cooler | |
| 140. |
The wavelength of the radiation emitted by a body depends upon |
| A. | The nature of the surface |
| B. | The area of the surface |
| C. | The temperature of the surface |
| D. | All of the above factors |
| Answer» D. All of the above factors | |
| 141. |
Two samples A and B of the same mass of a gas initially at the same pressure, temperature and volume are compressed to half the original volume. A isothermally and B adiabatically. The final pressure of A is |
| A. | Greater than that of B |
| B. | Equal to that of B |
| C. | Less than that of B |
| D. | Twice that of B |
| Answer» D. Twice that of B | |
| 142. |
In an isothermal expansion of a gas |
| A. | A pressure remains constant |
| B. | Temperature remains constant |
| C. | Density remains constant |
| D. | None of the above |
| Answer» C. Density remains constant | |
| 143. |
Temperature can be expressed as a derived quantity in terms of |
| A. | Length and mass |
| B. | Mass and time |
| C. | Length, mass and time |
| D. | None of these |
| Answer» E. | |
| 144. |
Pressure exerted by gas is |
| A. | Independent of the density of the gas |
| B. | Inversely proportional to the density of the gas |
| C. | Directly proportional to the density of the gas |
| D. | Directly proportional to the square of the density of the gas |
| Answer» D. Directly proportional to the square of the density of the gas | |
| 145. |
A real gas can be liquefied by the application of pressure when its temperature is |
| A. | Above the room temperature |
| B. | Above the inversion temperature |
| C. | At the Boyle temperature |
| D. | At the critical temperature |
| Answer» E. | |
| 146. |
White clothes are cooler than black ones because they |
| A. | Absorb all the light that reaches them |
| B. | Reflect all the light that reaches them |
| C. | Will not allow the light to penetrate |
| D. | Cool the sun light completely |
| Answer» C. Will not allow the light to penetrate | |
| 147. |
When a gas expends adiabatically |
| A. | No energy is required for expansion |
| B. | Energy is required and it comes from the wall of the container of the gas |
| C. | Internal energy of the gas is used in doing work |
| D. | Law of conservation of energy does not hold |
| Answer» D. Law of conservation of energy does not hold | |
| 148. |
The temperature of boiling water in a steam engine may be high because |
| A. | There are dissolved substances in water |
| B. | There is low pressure inside the boiler |
| C. | There is high pressure inside the boiler |
| D. | The fire is at very high temperature |
| Answer» D. The fire is at very high temperature | |
| 149. |
Cooking taken longest time |
| A. | At the sea level |
| B. | At Simla |
| C. | At Mount Everest |
| D. | None of these |
| Answer» D. None of these | |
| 150. |
A liquid boils at a temperature at which its saturated vapour pressure becomes |
| A. | Equal to the atmospheric pressure |
| B. | Twice the atmospheric pressure |
| C. | Half the atmospheric pressure |
| D. | None of the above |
| Answer» B. Twice the atmospheric pressure | |