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.
| 151. |
Water equivalent is equal to the product of |
| A. | Mass and Avogadro number |
| B. | Mass and gas counstant |
| C. | Mass and specific heat |
| D. | Latent heat and volume of water |
| Answer» D. Latent heat and volume of water | |
| 152. |
While measuring the thermal conductivity of a liquid, we keep the upper part hot and the lower part cool because |
| A. | Heat conduction is easier downwards |
| B. | Convection gets stopped in this way |
| C. | Radiation gets stopped in this way |
| D. | It is easier and more convenient to do so |
| Answer» C. Radiation gets stopped in this way | |
| 153. |
The critical temperature of a gas is the temperature |
| A. | At which Boyle's law is strictly obeyed |
| B. | At which the gas liquefies at a pressure of one atmosphere |
| C. | Above which the gas cannot be liquefied |
| D. | Below which the gas cannot be liquefied |
| Answer» D. Below which the gas cannot be liquefied | |
| 154. |
Heat capacity of substance is infinite. It means |
| A. | Infinite heat is given out |
| B. | Infinite heat is taken in |
| C. | No change in temperature whether heat is taken in or give out |
| D. | All of the above |
| Answer» D. All of the above | |
| 155. |
The unit of temperature adopted by the SI (international system of units) is the celsius and kelvin scales. It is based on the |
| A. | Melting point of ice |
| B. | Boiling point of water |
| C. | Triple point of water corresponding to -0.01 C |
| D. | Temperature at which solid, liquid and gaseous water are all in equilibrium, i.e., -273 C |
| Answer» D. Temperature at which solid, liquid and gaseous water are all in equilibrium, i.e., -273 C | |
| 156. |
Which one of the following statements is correct. Transfer of heat energy from a heater coil to the cooking vessel takes place through the process of |
| A. | Convection only |
| B. | Conduction and convection only |
| C. | Radiation and convection only |
| D. | Convection, conduction and radiation |
| Answer» D. Convection, conduction and radiation | |
| 157. |
Two bodies A and B are of same mass and same amount of heat is given to both of them. |
| A. | The specific heat capacity of A is more than that of B |
| B. | The specific heat capacity of A is less than that of B |
| C. | Both A and B have the same specific heat capacity but A has greater thermal conductivity |
| D. | Both A and B have the same specific heat capacity but B has greater thermal conductivity |
| Answer» C. Both A and B have the same specific heat capacity but A has greater thermal conductivity | |
| 158. |
During melting process the heat given to a body is utilised in |
| A. | Increasing the temperature |
| B. | Increasing the density of the material |
| C. | Increasing the potential energy of the molecules |
| D. | Increasing the kinetic energy of the molecules |
| Answer» D. Increasing the kinetic energy of the molecules | |
| 159. |
At normal temperature, due to a puncture, the compressed air inside the tube of a car wheel suddenly starts coming out. Then the air inside the tube |
| A. | Starts becoming hotter |
| B. | Starts becoming hotter |
| C. | Remains at the same temperature |
| D. | May become hotter or cooler depending on the amount of water vapour present in the air |
| Answer» D. May become hotter or cooler depending on the amount of water vapour present in the air | |
| 160. |
How can boiling point of a liquid be reduced? |
| A. | By adding a solid of lower melting point |
| B. | By dissolving a soluble solid in it |
| C. | By increasing the pressure on the liquid |
| D. | By decreasing the pressure on the liquid |
| Answer» E. | |
| 161. |
Low temperatures (cryogenise) find application in |
| A. | Space travel, surgery and magnetic levitation |
| B. | Surgery, magnetic levitation and telemetry |
| C. | Space travel, surgery and telemetry |
| D. | Space travel, magnetic levitation and telemetry |
| Answer» B. Surgery, magnetic levitation and telemetry | |
| 162. |
A polished metal plate with rough black spot on it is heated to about 2000 K and quickly taken to a dark room. Then the spot |
| A. | Will appear brighter than the plate |
| B. | Will appear darker than the plate |
| C. | And the plate will appear equally bright |
| D. | None of the above |
| Answer» B. Will appear darker than the plate | |
| 163. |
Metal tea pots have wooden handless because |
| A. | Wood is bad conductor of heat |
| B. | It prevents electric shock |
| C. | It gives beauty to the pots |
| D. | It is hygienic |
| Answer» B. It prevents electric shock | |
| 164. |
The water from a hand-pump is warm in winter because |
| A. | Our body is cold in winter and water appears to be warm |
| B. | The temperature inside the earth is higher than the atmospheric temperature |
| C. | The pumping process causes friction which warms up the water |
| D. | Inside water comes out and absorbs heat from the environment |
| Answer» C. The pumping process causes friction which warms up the water | |
| 165. |
The specific heat of a gas at constant pressure is greater than the specific heat at constant volume because |
| A. | Work is done in the expansion of the gas at constant pressure |
| B. | Work is done in the expansion of the gas at constant volume |
| C. | The attraction between the molecules increases at constant pressure |
| D. | The molecular collision increases at constant pressure |
| Answer» B. Work is done in the expansion of the gas at constant volume | |
| 166. |
Which of the following statement (s) is (are) true about thermal radiations? |
| A. | (i), (ii) and (iii) |
| B. | (ii), (iii) and (iv) |
| C. | (iii) and (iv) |
| D. | All of them |
| Answer» E. | |
| 167. |
According to Newton's law of cooling, the rate of cooling of a body is proportional to the |
| A. | Temperature of the body |
| B. | Temperature of the surrounding |
| C. | difference of the temperature of the body and its surroundings |
| D. | None of the above |
| Answer» D. None of the above | |
| 168. |
The product of the pressure and volume of an ideal gas is |
| A. | A constant |
| B. | Approximately equal to the universal gas constant |
| C. | directly proportional to its temperature |
| D. | Inversely proportional to its temperature |
| Answer» D. Inversely proportional to its temperature | |
| 169. |
The pressure exerted on the walls of the container by a gas is due to the fact that the gas molecules |
| A. | Lose their kinetic energy |
| B. | Stick to the walls |
| C. | Are accelerated towards the walls |
| D. | Change their momenta due to collision with the walls |
| Answer» E. | |
| 170. |
Two blocks of ice when pressed together join to form one block because |
| A. | Of heat produced during pressing |
| B. | Of cold produced during pressing |
| C. | Melting point of ice increases with increase of pressure |
| D. | Melting point of ice decrease with increase of pressure |
| Answer» E. | |
| 171. |
It is difficult to cook at high altitudes because |
| A. | There is less oxygen in the air |
| B. | Due to falling temperature, more heat has to be given |
| C. | Due to decrease in atmospheric pressure, the boiling point of water decreases |
| D. | Of high moisture content there |
| Answer» D. Of high moisture content there | |
| 172. |
Which of the following statements are true regarding heat? |
| A. | 1, 2 and 3 |
| B. | 2, 3 and 4 |
| C. | 1, 2 and 4 |
| D. | 1, 3 and 4 |
| Answer» E. | |
| 173. |
When an ideal gas under goes an isothermal expansion, the pressure of the gas in the enclosure falls. This is due to |
| A. | Decreased in the change of momentum per collision |
| B. | Decrease in the frequency of collision |
| C. | Decrease in the frequency of collision and the change of momentum per collision |
| D. | Decrease in neither the frequency of collision nor the change of momentum per collision |
| Answer» C. Decrease in the frequency of collision and the change of momentum per collision | |
| 174. |
In a pressure cooker the cooking is fast because |
| A. | The boiling point of water is raised by the increased pressure inside the cooker |
| B. | The boiling point of water is lowered by the increased pressure |
| C. | More steam is available to cook the food at 1000 C |
| D. | None of the above |
| Answer» B. The boiling point of water is lowered by the increased pressure | |
| 175. |
A cooking pot should have |
| A. | High specific heat and low conductivity |
| B. | High specific heat and high conductivity |
| C. | Low specific heat and low conductivity |
| D. | Low specific heat and high conductivity |
| Answer» C. Low specific heat and low conductivity | |
| 176. |
A piece of metal and a piece of wood are kept at temperature of 45 C on touching the two of them with hand |
| A. | The two will appear equally hot |
| B. | The piece of wood will appear hotter than the piece of metal |
| C. | The piece of metal will appear hotter than the piece of wood |
| D. | The distinction in the hotness will not be possible |
| Answer» D. The distinction in the hotness will not be possible | |
| 177. |
A piece of glass is heated to high temperature and then allowed to cool. If it cracks, a possible reason for this is the following property of glass |
| A. | Low thermal conductivity |
| B. | High thermal conductivity |
| C. | High specific heat |
| D. | Low specific heat |
| Answer» B. High thermal conductivity | |
| 178. |
A solid sphere of radius R and a hollow sphere of inner radius R / 2 and outer radius R, made of copper, are heated to the same temperature and are allowed to cool in the same environment. Then |
| A. | Hollow sphere cools faster |
| B. | Both the spheres attain room temperature at the same time |
| C. | Solid sphere cools faster |
| D. | None of the above |
| Answer» B. Both the spheres attain room temperature at the same time | |
| 179. |
A solid cube and solid sphere of the same material have equal surface areas. Both are at the same temperature of 120 C then |
| A. | Both of them will cool down at the same rate |
| B. | The cube will cool down faster than the sphere |
| C. | The sphere will cool down faster than the cube |
| D. | None of the above |
| Answer» C. The sphere will cool down faster than the cube | |
| 180. |
If a graph is plotted taking the temperature in fahrenheit along the Y-axis and the corresponding temperature in celsius along X-axis it will be straight line |
| A. | Having a positive intercept on the Y-axis |
| B. | Having a positive intercept on X-axis |
| C. | Passing through origin |
| D. | Having negative intercepts on both the axes |
| Answer» B. Having a positive intercept on X-axis | |
| 181. |
A glass container cracks when very hot tea is poured into it. A probable reason for this is the |
| A. | Low thermal conductivity of glass |
| B. | High thermal conductivity of glass |
| C. | Low specific heat of glass |
| D. | None of the above |
| Answer» B. High thermal conductivity of glass | |
| 182. |
During adiabatic compression of a gas its temperature |
| A. | Remains constant |
| B. | Becomes zero |
| C. | Falls |
| D. | Rises |
| Answer» E. | |
| 183. |
If the thermal capacity of a body is infinite, then |
| A. | Heat can never be added to it |
| B. | Heat can never be extracted from it |
| C. | The temperature of the body can not be altered by adding or extracting any amount of heat |
| D. | It has infinite amount of heat |
| Answer» D. It has infinite amount of heat | |
| 184. |
A closed bottle containing water at room temperature is taken to the moon and then the lid is opened. The water will |
| A. | Freeze |
| B. | Boil |
| C. | Decompose into hydrogen and oxygen |
| D. | Not change at all |
| Answer» C. Decompose into hydrogen and oxygen | |
| 185. |
The energy that can harness heat stored below the earth's surface is known as |
| A. | Thermal energy |
| B. | Nuclear energy |
| C. | Tidal energy |
| D. | Geo-thermal energy |
| Answer» E. | |
| 186. |
The amount of heat required to raise the temperature of a body through 1 K is called its |
| A. | Thermal capacity |
| B. | Entropy |
| C. | Specific heat |
| D. | Water equivalent |
| Answer» B. Entropy | |
| 187. |
The first operation involved in a Carnot cycle is |
| A. | Isothermal expansion |
| B. | Adiabatic expansion |
| C. | Isothermal compression |
| D. | Adiabatic compression |
| Answer» B. Adiabatic expansion | |
| 188. |
PV / T = constant is true for |
| A. | Isothermal changes only |
| B. | Adiabatic changes only |
| C. | Both isothermal and adiabatic changes |
| D. | Neither isothermal nor adiabatic changes |
| Answer» D. Neither isothermal nor adiabatic changes | |
| 189. |
In which of the following process the internal energy of a system remains constant? |
| A. | Adiabatic |
| B. | Isothermal |
| C. | Isobaric |
| D. | None of these |
| Answer» C. Isobaric | |
| 190. |
A body cools from 85 C to 80 C in 5 minutes. The time taken to cool from 80 C to 75 C is |
| A. | Less than 5 minutes |
| B. | More than 5 minutes |
| C. | 5 minutes |
| D. | None of these |
| Answer» C. 5 minutes | |
| 191. |
If the atmospheric temperature and the due point are nearly equal then |
| A. | The relative humidity is 100% |
| B. | The relative humidity is zero |
| C. | The relative humidity is 50% |
| D. | None of the above |
| Answer» B. The relative humidity is zero | |
| 192. |
A body cools from 60 C to 50 C in 10 minutes when kept in air at 30 C. In the next 10 minutes its temperature will be |
| A. | Below 40 C |
| B. | 40 C |
| C. | Above 40 C |
| D. | Can not be predicted |
| Answer» D. Can not be predicted | |
| 193. |
A sample of gas expands from volume V |
| A. | Iso-thermal |
| B. | Isobaric |
| C. | Adiabatic |
| D. | Equal in all cases |
| Answer» C. Adiabatic | |
| 194. |
If is hotter for the same distance over the top of a flame than it is on one side of it because |
| A. | More heat is radiated upwards |
| B. | Air conducts more heat upwards |
| C. | Convection takes heat upward |
| D. | Of some reason other than the above three |
| Answer» D. Of some reason other than the above three | |
| 195. |
A piece of blue glass heated to a high temperature and piece of red glass at room temperature are taken inside dimly-lit room Then |
| A. | The blue piece will look blue and the red piece will red as usual |
| B. | Both the pieces will look equally red |
| C. | The blue piece will look brighter red as compared to the red piece |
| D. | Both the pieces will look red but the blue piece will be dimmer |
| Answer» D. Both the pieces will look red but the blue piece will be dimmer | |
| 196. |
In the winter season if we touch two blocks one of iron and another of wood in the early morning then the block of iron appears to be more cold because |
| A. | The temperature of the iron block is less than that of the wooden block |
| B. | Iron is a good conductor of heat in comparison of the wood |
| C. | Iron is a bad conductor of heat in comparison of the wood |
| D. | The block of iron is heavier than the wooden block |
| Answer» C. Iron is a bad conductor of heat in comparison of the wood | |
| 197. |
Woollen clothes keep the body warm because |
| A. | Wool increases the temperature of the body |
| B. | Wool is the bad conductor of the heat so it does not allow heat to flow out of the body |
| C. | Wool absorbs radiant heat from outer objects |
| D. | Wool rejects heat from outer objects |
| Answer» C. Wool absorbs radiant heat from outer objects | |
| 198. |
An electric heater, kept in vacuum, is heated continuously by passing electric current. Its temperature |
| A. | Will go on rising with time |
| B. | Will stop rising after some time as it will lose heat to the surrounding by conduction |
| C. | Will become constant after some time because of loss of heat due to radiation |
| D. | None of the above |
| Answer» D. None of the above | |
| 199. |
A large iceberg melts at the base but not at the top because |
| A. | The base of iceberg remains in warmer conditions |
| B. | Ice at the base contains impurities |
| C. | Higher pressure at the base lowers the melting point of ice |
| D. | Ice at the top is different kind |
| Answer» D. Ice at the top is different kind | |
| 200. |
Rate of diffusion is |
| A. | Faster in solids than in liquids and gases |
| B. | Faster in gases than in solids and gases |
| C. | Faster in gases than in liquids and gases |
| D. | Equal in solids, liquids and gases |
| Answer» D. Equal in solids, liquids and gases | |