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MCQOPTIONS
This section includes 12583 Mcqs, each offering curated multiple-choice questions to sharpen your Joint Entrance Exam - Main (JEE Main) knowledge and support exam preparation. Choose a topic below to get started.
| 11301. |
The wavelength of maximum emitted energy of a body at 700 K is 4.08 \[\mu m\]. If the temperature of the body is raised to 1400 K, the wavelength of maximum emitted energy will be [MP PET 1990] |
| A. | \[1.02\ \mu m\] |
| B. | 16.32\[\mu m\] |
| C. | 8.16\[\mu m\] |
| D. | 2.04\[\mu m\] |
| Answer» E. | |
| 11302. |
The maximum energy in thermal radiation from a source occurs at the wavelength 4000Å. The effective temperature of the source is [AMU (Engg.) 1999] |
| A. | \[7325\,K\] |
| B. | \[80000K\] |
| C. | \[{{10}^{4}}\,K\] |
| D. | \[{{10}^{6}}\,K\] |
| Answer» B. \[80000K\] | |
| 11303. |
What will be the ratio of temperatures of sun and moon if the wavelengths of their maximum emission radiations rates are 140 Å and 4200 Å respectively [J & K CET 2004] |
| A. | 1 : 30 |
| B. | 30 : 1 |
| C. | 42 : 14 |
| D. | 14 : 42 |
| Answer» C. 42 : 14 | |
| 11304. |
On investigation of light from three different stars A, B and C, it was found that in the spectrum of A the intensity of red colour is maximum, in B the intensity of blue colour is maximum and in C the intensity of yellow colour is maximum. From these observations it can be concluded that [CPMT 1989] |
| A. | The temperature of A is maximum, B is minimum and C is intermediate |
| B. | The temperature of A is maximum, C is minimum and B is intermediate |
| C. | The temperature of B is maximum, A is minimum and C is intermediate |
| D. | The temperature of C is maximum, B is minimum and A is intermediate |
| Answer» D. The temperature of C is maximum, B is minimum and A is intermediate | |
| 11305. |
The maximum wavelength of radiation emitted at \[2000\ K\]is \[4\mu m\]. What will be the maximum wavelength of radiation emitted at [MP PMT/PET 1998; DPMT 2000] |
| A. | \[3.33\ \mu m\] |
| B. | \[0.66\ \mu m\] |
| C. | \[1\ \mu m\] |
| D. | \[1\ m\] |
| Answer» B. \[0.66\ \mu m\] | |
| 11306. |
Four pieces of iron heated in a furnace to different temperatures show different colours listed below. Which one has the highest temperature [MP PET 1992] |
| A. | White |
| B. | Yellow |
| C. | Orange |
| D. | Red |
| Answer» B. Yellow | |
| 11307. |
The spectral energy distribution of star is maximum at twice temperature as that of sun. The total energy radiated by star is [J & K CET 2005] |
| A. | Twice as that of the sun |
| B. | Same as that of the sun |
| C. | Sixteen times as that of the sun |
| D. | One sixteenth of sun |
| Answer» D. One sixteenth of sun | |
| 11308. |
Rate of cooling at 600K, if surrounding temperature is 300K is R. The rate of cooling at 900K is [DPMT 2002] |
| A. | \[\frac{16}{3}R\] |
| B. | \[2R\] |
| C. | \[3R\] |
| D. | \[\frac{2}{3}R\] |
| Answer» B. \[2R\] | |
| 11309. |
At 127o C radiates energy is 2.7 ´ 10-3 J/s. At what temperature radiated energy is 4.32 ´ 10 6 J/s [BCECE 2004] |
| A. | 400 K |
| B. | 4000 K |
| C. | 80000 K |
| D. | 40000 K |
| Answer» D. 40000 K | |
| 11310. |
The energy spectrum of a black body exhibits a maximum around a wavelength \[{{\lambda }_{o}}.\] The temperature of the black body is now changed such that the energy is maximum around a wavelength \[\frac{3{{\lambda }_{o}}}{4}\].The power radiated by the black body will now increase by a factor of [KCET 2002] |
| A. | 256/81 |
| B. | 64/27 |
| C. | 16/9 |
| D. | 4/3 |
| Answer» B. 64/27 | |
| 11311. |
A body takes 5 minute to cool from 80°C to 50°C. How much time it will take to cool from 60°C to 30°C, if room temperature is 20°C. [RPET 1998] |
| A. | 40 minute |
| B. | 9 minute |
| C. | 30 minute |
| D. | 20 minute |
| Answer» C. 30 minute | |
| 11312. |
A calorimeter of mass 0.2 kg and specific heat 900 J/kg-K. Containing 0.5 kg of a liquid of specific heat 2400J /kg-K. Its temperature falls from \[{{60}^{o}}C\,\text{to}\,\,\text{5}{{\text{5}}^{\text{o}}}C\] in one minute. The rate of cooling is [MP PET 2003] |
| A. | 5 J/s |
| B. | 15 J/s |
| C. | 100 J/s |
| D. | 115 J/s |
| Answer» E. | |
| 11313. |
According to ?Newton?s Law of cooling?, the rate of cooling of a body is proportional to the [MP PET 2001] |
| A. | Temperature of the body |
| B. | Temperature of the surrounding |
| C. | Fourth power of the temperature of the body |
| D. | Difference of the temperature of the body and the surroundings |
| Answer» E. | |
| 11314. |
The rates of cooling of two different liquids put in exactly similar calorimeters and kept in identical surroundings are the same if [MP PMT/PET 1998] |
| A. | The masses of the liquids are equal |
| B. | Equal masses of the liquids at the same temperature are taken |
| C. | Different volumes of the liquids at the same temperature are taken |
| D. | Equal volumes of the liquids at the same temperature are taken |
| Answer» E. | |
| 11315. |
Which of the following statements is true/correct [Manipal MEE 1995 |
| A. | During clear nights, the temperature rises steadily upward near the ground level |
| B. | Newton's law of cooling, an approximate form of Stefan's law, is valid only for natural convection |
| C. | The total energy emitted by a black body per unit time per unit area is proportional to the square of its temperature in the Kelvin scale |
| D. | Two spheres of the same material have radii \[1m\] and \[{{S}_{1}}\] and temperatures 4000 K and 2000 K respectively. The energy radiated per second by the first sphere is greater than that radiated per second by the second sphere |
| Answer» C. The total energy emitted by a black body per unit time per unit area is proportional to the square of its temperature in the Kelvin scale | |
| 11316. |
Which of the following is the correct device for the detection of thermal radiation [Manipal MEE 1995, UPSEAT 2000] |
| A. | Constant volume thermometer |
| B. | Liquid-in-glass thermometer |
| C. | Six's maximum and minimum thermometer |
| D. | Thermopile |
| Answer» E. | |
| 11317. |
The earth radiates in the infra-red region of the spectrum. The spectrum is correctly given by [RPET 2002; AIEEE 2003] |
| A. | Wien?s law |
| B. | Rayleigh jeans law |
| C. | Planck?s law of radiation |
| D. | Stefan?s law of radiation |
| Answer» D. Stefan?s law of radiation | |
| 11318. |
Two thermometers A and B are exposed in sun light. The valve of A is painted black, But that of B is not painted. The correct statement regarding this case is [BHU (Med.) 1999; MH CET 1999] |
| A. | Temperature of A will rise faster than B but the final temperature will be the same in both |
| B. | Both A and B show equal rise in beginning |
| C. | Temperature of A will remain more than B |
| D. | Temperature of B will rise faster |
| Answer» B. Both A and B show equal rise in beginning | |
| 11319. |
Half part of ice block is covered with black cloth and rest half is covered with white cloth and then it is kept in sunlight. After some time clothes are removed to see the melted ice. Which of the following statements is correct |
| A. | Ice covered with white cloth will melt more |
| B. | Ice covered with black cloth will melt more |
| C. | Equal ice will melt under both clothes |
| D. | It will depend on the temperature of surroundings of ice |
| Answer» C. Equal ice will melt under both clothes | |
| 11320. |
For a perfectly black body, its absorptive power is [MP PMT 1989, 92; RPMT 2001; RPET 2001, 03; AFMC 2003] |
| A. | 1 |
| B. | 0.5 |
| C. | 0 |
| D. | Infinity |
| Answer» B. 0.5 | |
| 11321. |
Assertion : It is hotter over the top of a fire than at the same distance on the sides. Reason : Air surrounding the fire conducts more heat upwards. [AIIMS 2003] |
| A. | If both assertion and reason are true and the reason is the correct explanation of the assertion. |
| B. | If both assertion and reason are true but reason is not the correct explanation of the assertion. |
| C. | If assertion is true but reason is false. |
| D. | If the assertion and reason both are false. |
| Answer» D. If the assertion and reason both are false. | |
| 11322. |
A pendulum clock keeps correct time at \[0{}^\circ C\]. Its mean coefficient of linear expansions is \[\alpha /{}^\circ C\], then the loss in seconds per day by the clock if the temperature rises by \[t{}^\circ C\] is |
| A. | \[\frac{\frac{1}{2}\alpha \,t\times 864000}{1-\frac{\alpha \,t}{2}}\] |
| B. | \[\frac{1}{2}\alpha \,t\times \,86400\] |
| C. | \[\frac{\frac{1}{2}\alpha \,t\times 86400}{{{\left( 1-\,\frac{\alpha \,t}{2} \right)}^{2}}}\] |
| D. | \[\frac{\frac{1}{2}\alpha \,t\times 86400}{1+\frac{\alpha \,t}{2}}\] |
| Answer» C. \[\frac{\frac{1}{2}\alpha \,t\times 86400}{{{\left( 1-\,\frac{\alpha \,t}{2} \right)}^{2}}}\] | |
| 11323. |
At what temperature the centigrade (Celsius) and Fahrenheit, readings are the same |
| A. | \[\text{ }40{}^\circ \] |
| B. | \[+\text{ }40{}^\circ \] |
| C. | \[36.6{}^\circ \] |
| D. | \[\text{ }37{}^\circ \] |
| Answer» B. \[+\text{ }40{}^\circ \] | |
| 11324. |
The temperature of the sun is measured with |
| A. | Platinum thermometer |
| B. | Gas thermometer |
| C. | Pyrometer |
| D. | Vapour pressure thermometer |
| Answer» D. Vapour pressure thermometer | |
| 11325. |
Dry ice is |
| A. | Ice cube |
| B. | Sodium chloride |
| C. | Liquid nitrogen |
| D. | Solid carbon dioxide |
| Answer» E. | |
| 11326. |
A hammer of mass 1kg having speed of 50 m/s, hit a iron nail of mass 200 gm. If specific heat of iron is 0.105 cal/gm\[{}^\circ C\] and half the energy is converted into heat, the raise in temperature of nail is |
| A. | \[7.1{}^\circ C\] |
| B. | \[9.2{}^\circ C\] |
| C. | \[10.5{}^\circ C\] |
| D. | \[12.1{}^\circ C\] |
| Answer» B. \[9.2{}^\circ C\] | |
| 11327. |
Calorimeters are made of which of the following |
| A. | Glass |
| B. | Metal |
| C. | Wood |
| D. | Either [a] or [c] |
| Answer» C. Wood | |
| 11328. |
The mechanical equivalent of heat J is |
| A. | A constant |
| B. | A physical quantity |
| C. | A conversion factor |
| D. | None of the above |
| Answer» D. None of the above | |
| 11329. |
A body of mass 5 kg falls from a height of 30 metre. If its all mechanical energy is changed into heat, then heat produced will be |
| A. | 350 cal |
| B. | 150 cal |
| C. | 60 cal |
| D. | 6 cal |
| Answer» B. 150 cal | |
| 11330. |
A constant pressure air thermometer gave a reading of 47.5 units of volume when immersed in ice cold water, and 67 units in a boiling liquids. The boiling point of the liquid will be |
| A. | \[135{}^\circ C\] |
| B. | \[125{}^\circ C\] |
| C. | \[112{}^\circ C\] |
| D. | \[100{}^\circ C\] |
| Answer» D. \[100{}^\circ C\] | |
| 11331. |
The temperature of a body on Kelvin scale is found to be x K. When it is measured by Fahrenheit thermometer, it is found to be \[x{}^\circ F\], then the value of x is |
| A. | 40 |
| B. | 313 |
| C. | 574.25 |
| D. | 301.25 |
| Answer» D. 301.25 | |
| 11332. |
Thermoelectric thermometer is based on |
| A. | Photoelectric effect |
| B. | Seeback effect |
| C. | Compton effect |
| D. | Joule effect |
| Answer» C. Compton effect | |
| 11333. |
Three liquids with masses \[{{m}_{1}},\,{{m}_{2}},\,{{m}_{3}}\] are thoroughly mixed. If their specific heats are \[{{c}_{1}},\,{{c}_{2}},\,{{c}_{3}}\] and their temperatures \[{{T}_{1}},\,{{T}_{2}},\,{{T}_{3}}\] respectively, then the temperature of the mixture is |
| A. | \[\frac{{{c}_{1}}{{T}_{1}}+{{c}_{2}}{{T}_{2}}+{{c}_{3}}{{T}_{3}}}{{{m}_{1}}{{c}_{1}}+{{m}_{2}}{{c}_{2}}+{{m}_{3}}{{c}_{3}}}\] |
| B. | \[\frac{{{m}_{1}}{{c}_{1}}{{T}_{1}}+{{m}_{2}}{{c}_{2}}{{T}_{2}}+{{m}_{3}}{{c}_{3}}{{T}_{3}}}{{{m}_{1}}{{c}_{1}}+{{m}_{2}}{{c}_{2}}+{{m}_{3}}{{c}_{3}}}\] |
| C. | \[\frac{{{m}_{1}}{{c}_{1}}{{T}_{1}}+{{m}_{2}}{{c}_{2}}{{T}_{2}}+{{m}_{3}}{{c}_{3}}{{T}_{3}}}{{{m}_{1}}{{T}_{1}}+{{m}_{2}}{{T}_{2}}+{{m}_{3}}{{T}_{3}}}\] |
| D. | \[\frac{{{m}_{1}}{{T}_{1}}+{{m}_{2}}{{T}_{2}}+{{m}_{3}}{{T}_{3}}}{{{c}_{1}}{{T}_{1}}+{{c}_{2}}{{T}_{2}}+{{c}_{3}}{{T}_{3}}}\] |
| Answer» C. \[\frac{{{m}_{1}}{{c}_{1}}{{T}_{1}}+{{m}_{2}}{{c}_{2}}{{T}_{2}}+{{m}_{3}}{{c}_{3}}{{T}_{3}}}{{{m}_{1}}{{T}_{1}}+{{m}_{2}}{{T}_{2}}+{{m}_{3}}{{T}_{3}}}\] | |
| 11334. |
During constant temperature, we feel colder on a day when the relative humidity will be |
| A. | 0.25 |
| B. | 0.125 |
| C. | 0.5 |
| D. | 0.75 |
| Answer» B. 0.125 | |
| 11335. |
Water is used to cool radiators of engines, because |
| A. | Of its lower density |
| B. | It is easily available |
| C. | It is cheap |
| D. | It has high specific heat |
| Answer» E. | |
| 11336. |
An iron bar of length 10 m is heated from \[0{}^\circ C\] to \[100{}^\circ C\]. If the coefficient of linear thermal expansion of iron is \[10\times {{10}^{\,6}}/{}^\circ C\], the increase in the length of bar is |
| A. | 0.5 cm |
| B. | 1.0 cm |
| C. | 1.5 cm |
| D. | 2.0 cm |
| Answer» C. 1.5 cm | |
| 11337. |
If the length of a cylinder on heating increases by 2%, the area of its base will increase by |
| A. | 0.005 |
| B. | 0.02 |
| C. | 0.01 |
| D. | 0.04 |
| Answer» E. | |
| 11338. |
When a copper ball is heated, the largest percentage increase will occur in its |
| A. | Diameter |
| B. | Area |
| C. | Volume |
| D. | Density |
| Answer» D. Density | |
| 11339. |
A device used to measure very high temperature is |
| A. | Pyrometer |
| B. | Thermometer |
| C. | Bolometer |
| D. | Calorimeter |
| Answer» B. Thermometer | |
| 11340. |
2 kg of ice at \[\text{ }20{}^\circ C\] is mixed with 5kg of water at \[20{}^\circ C\] in an insulating vessel having a negligible heat capacity. Calculate the final mass of water remaining in the container. It is given that the specific heats of water and ice are \[1\text{ }kcal/kg\text{ }/{}^\circ C\] and \[0.5\text{ }kcal/kg/{}^\circ C\] while the latent heat of fusion of ice is 80 kcal/kg |
| A. | 7kg |
| B. | 6kg |
| C. | 4kg |
| D. | 2kg |
| Answer» C. 4kg | |
| 11341. |
A piece of metal weight 46 gm in air, when it is immersed in the liquid of specific gravity 1.24 at \[27{}^\circ C\] it weighs 30 gm. When the temperature of liquid is raised to \[42{}^\circ C\], the metal piece weighs 30.5 gm, specific gravity of the liquid at \[42{}^\circ C\] is 1.20, then the linear expansion of the metal will be |
| A. | \[3.316\,\times \,{{10}^{-5}}\,/{}^\circ C\] |
| B. | \[2.316\,\times \,{{10}^{-5}}\,/{}^\circ C\] |
| C. | \[4.316\,\times \,{{10}^{-5}}\,/{}^\circ C\] |
| D. | None of these |
| Answer» C. \[4.316\,\times \,{{10}^{-5}}\,/{}^\circ C\] | |
| 11342. |
If the length of a cylinder on heating increases by 2%, the area of its base will increase by- |
| A. | 0.005 |
| B. | 0.02 |
| C. | 0.01 |
| D. | 0.04 |
| Answer» E. | |
| 11343. |
When a building is constructed at \[-10{}^\circ C\], a steel beam (cross-sectional area \[45\text{ }c{{m}^{2}}\]) is put in place with its ends cemented in pillars. If the sealed ends cannot move, what will be the compressional force in the beam when the temperature is \[25{}^\circ C\]? For this kind of steel, \[\alpha =1.1\times {{10}^{-5}}\,{{\,}^{o}}{{C}^{-1}}\] and \[Y=2.0\times {{10}^{11}}N/{{m}^{2}}\]. |
| A. | \[2.5\times {{10}^{3}}N\] |
| B. | \[3.5\times {{10}^{5}}N\] |
| C. | \[2.5\times {{10}^{5}}N\] |
| D. | \[3.5\times {{10}^{3}}N\] |
| Answer» C. \[2.5\times {{10}^{5}}N\] | |
| 11344. |
A circular hole is made in a plate. The plate is now heated. Which of the following statements is/are correct? |
| A. | radius of the hole starts to decrease |
| B. | no stress is developed in the material of plate |
| C. | volume of the plate material will decrease |
| D. | none of these |
| Answer» C. volume of the plate material will decrease | |
| 11345. |
4 gms of steam at \[100{}^\circ C\] is added to 20 gms of water at \[46{}^\circ C\] in a container of negligible mass. Assuming no heat is lost to surrounding, the mass of water in container at thermal equilibrium is. Latent heat of vaporisation \[=\text{ }540\text{ }cal/gm\]. Specific heat of water \[=\text{ }1\text{ }cal/gm-{}^\circ C\]. |
| A. | 18gm |
| B. | 20gm |
| C. | 22gm |
| D. | 24gm |
| Answer» D. 24gm | |
| 11346. |
An ice block at \[0{}^\circ C\] and of mass m is dropped from height 'h' such that the loss in gravitational potential energy of block is exactly equal to the heat required to just completely melt the ice. Taking latent heat of fusion of ice \[=\text{ }80\text{ }cal/gm,\] acceleration due to gravity \[=\text{ }10\text{ }m/{{s}^{2}}\] and, mechanical equivalent of heat \[=\text{ }4.2\text{ }J/Cal\]. The value of 'h' is |
| A. | 8 m |
| B. | 8 km |
| C. | 33.6 m |
| D. | 33.6 km |
| Answer» E. | |
| 11347. |
On an X temperature scale, water freezes at \[-125.0{}^\circ X\] and boils at \[375.0{}^\circ X\]. On a Y temperature scale, water freezes at \[-70.0{}^\circ Y\] and boils at\[-30.0{}^\circ Y\]. The value of temperature on X-scale equal to the temperature of \[50.0{}^\circ Y\] on Y-scale is : |
| A. | \[455.0{}^\circ X\] |
| B. | \[-125.0{}^\circ X\] |
| C. | \[1375.0{}^\circ X\] |
| D. | \[1500.0{}^\circ X\] |
| Answer» D. \[1500.0{}^\circ X\] | |
| 11348. |
The resistance of a resistance thermometer has values 2.71 and 3.70 ohm at 10°C and 100°C. The temperature at which the resistance is 3.26 ohm is [CPMT 1994] |
| A. | 40°C |
| B. | 50°C |
| C. | 60°C |
| D. | 70°C |
| Answer» C. 60°C | |
| 11349. |
The correct value of 0°C on Kelvin scale will be [RPMT 1999] |
| A. | 273.15 K |
| B. | 273.00 K |
| C. | 273.05 K |
| D. | 273.63 K |
| Answer» B. 273.00 K | |
| 11350. |
A constant pressure air thermometer gave a reading of 47.5 units of volume when immersed in ice cold water, and 67 units in a boiling liquids. The boiling point of the liquid will be [AIIMS 1994] |
| A. | 135°C |
| B. | 125°C |
| C. | 112°C |
| D. | 100°C |
| Answer» D. 100°C | |