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question_answer1)
On the Celsius scale the absolute zero of temperature is at
A)
\[0{}^\circ C\] done
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B)
\[\,32{}^\circ C\] done
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C)
\[100{}^\circ C\] done
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D)
\[\text{ }273.15{}^\circ C\] done
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question_answer2)
The temperature on Celsius scale is \[25{}^\circ C\]. What is the corresponding temperature on the Fahrenheit scale
A)
\[40{}^\circ F\] done
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B)
\[77{}^\circ F\] done
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C)
\[50{}^\circ F\] done
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D)
\[45{}^\circ F\] done
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question_answer3)
On centigrade scale the temperature of a body increases by 30 degrees. The increase in temperature on Fahrenheit scale is
A)
\[50{}^\circ \] done
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B)
\[40{}^\circ \] done
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C)
\[30{}^\circ \] done
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D)
\[54{}^\circ \] done
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question_answer4)
Water has maximum density at
A)
\[0{}^\circ C\] done
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B)
\[32{}^\circ F\] done
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C)
\[\text{ }4{}^\circ C\] done
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D)
\[4{}^\circ C\] done
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question_answer5)
Ratio among linear expansion coefficient \[(\alpha )\], areal expansion coefficient \[(\beta )\] and volume expansion coefficient \[(\gamma )\] is
A)
1 : 2 : 3 done
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B)
3 : 2 : 1 done
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C)
4 : 3 : 2 done
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D)
None of these done
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question_answer6)
Two rods, one of aluminum and the other made of steel, having initial length \[{{l}_{1}}\] and \[{{l}_{2}}\] are connected together to form a single rod of length \[{{l}_{1}}+{{l}_{2}}\]. The coefficients of linear expansion for aluminum and steel are \[{{\alpha }_{a}}\] and \[{{\alpha }_{s}}\] respectively. If the length of each rod increases by the same amount when their temperature are raised by \[{{t}^{o}}C\], then find the ratio \[\frac{{{l}_{1}}}{({{l}_{1}}+{{l}_{2}})}\]
A)
\[\frac{{{\alpha }_{s}}}{{{\alpha }_{a}}}\] done
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B)
\[\frac{{{\alpha }_{a}}}{{{\alpha }_{s}}}\] done
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C)
\[\frac{{{\alpha }_{s}}}{({{\alpha }_{a}}+{{\alpha }_{s}})}\] done
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D)
\[\frac{{{\alpha }_{a}}}{({{\alpha }_{a}}+{{\alpha }_{s}})}\] done
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question_answer7)
A quantity of heat required to change the unit mass of a solid substance, from solid state to liquid state, while the temperature remains constant, is known as
A)
Latent heat done
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B)
Sublimation done
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C)
Hoar frost done
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D)
Latent heat of fusion done
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question_answer8)
A metallic ball and highly stretched spring are made of the same material and have the same mass. They are heated so that they melt, the latent heat required
A)
Are the same for both done
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B)
Is greater for the ball done
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C)
Is greater for the spring done
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D)
For the two may or may not be the same depending upon the metal done
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question_answer9)
A closed bottle containing water at \[30{}^\circ C\] is carried to the moon in a space-ship. If it is placed on the surface of the moon, what will happen to the water as soon as the lid is opened
A)
Water will boil done
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B)
Water will freeze done
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C)
Nothing will happen on it done
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D)
It will decompose into \[{{H}_{2}}\] and \[{{O}_{2}}\] done
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question_answer10)
A block of mass 100 gm slides on a rough horizontal surface. If the speed of the block decreases from 10 m/s to 5 m/s, the thermal energy developed in the process is
A)
3.75 J done
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B)
37.5 J done
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C)
0.375 J done
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D)
0.75 J done
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question_answer11)
5 g of ice at \[0{}^\circ C\] is dropped in a beaker containing 20 g of water at \[40{}^\circ C\]. The final temperature will be
A)
\[32{}^\circ C\] done
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B)
\[16{}^\circ C\] done
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C)
\[8{}^\circ C\] done
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D)
\[24{}^\circ C\] done
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question_answer12)
The thermal capacity of a body is 80 cal, then its water equivalent is
A)
80 cal / gm done
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B)
8 gm done
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C)
80 gm done
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D)
80 kg done
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question_answer13)
The resistance of a resistance thermometer has values 2.71 and 3.70 ohm at \[10{}^\circ C\] and \[100{}^\circ C\]. The temperature at which the resistance is 3.26 ohm is
A)
\[40{}^\circ C\] done
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B)
\[50{}^\circ C\] done
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C)
\[60{}^\circ C\] done
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D)
\[70{}^\circ C\] done
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question_answer14)
One quality of a thermometer is that its heat capacity should be small. If P is a mercury thermometer, Q is a resistance thermometer and R thermocouple type then
A)
P is best, R worst done
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B)
R is best, P worst done
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C)
R is best, Q worst done
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D)
P is best, Q worst done
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question_answer15)
A device used to measure very high temperature is
A)
Pyrometer done
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B)
Thermometer done
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C)
Bolometer done
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D)
Calorimeter done
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question_answer16)
When a copper ball is heated, the largest percentage increase will occur in its
A)
Diameter done
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B)
Area done
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C)
Volume done
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D)
Density done
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question_answer17)
If the length of a cylinder on heating increases by 2%, the area of its base will increase by
A)
0.5% done
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B)
2% done
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C)
1% done
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D)
4% done
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question_answer18)
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 done
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B)
1.0 cm done
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C)
1.5 cm done
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D)
2.0 cm done
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question_answer19)
Water is used to cool radiators of engines, because
A)
Of its lower density done
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B)
It is easily available done
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C)
It is cheap done
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D)
It has high specific heat done
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question_answer20)
Two spheres made of same substance have diameters in the ratio 1 : 2. Their thermal capacities are in the ratio of
A)
1 : 2 done
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B)
1 : 8 done
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C)
1 : 4 done
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D)
2 : 1 done
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question_answer21)
At atmospheric pressure, the water boils at \[100{}^\circ C\]. If pressure is reduced, it will boil at
A)
Higher temperature done
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B)
Lower temperature done
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C)
At the same temperature done
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D)
At critical temperature done
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question_answer22)
The SI unit of mechanical equivalent of heat is
A)
Joule \[\times \] Calorie done
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B)
Joule/Calorie done
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C)
Calorie \[\times \] Erg done
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D)
Erg/Calorie done
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question_answer23)
A lead bullet of 10 g travelling at 300 m/s strikes against a block of wood and comes to rest. Assuming 50% of heat is absorbed by the bullet, the increase in its temperature is (Specific heat of lead = 150J/kg, K)
A)
\[100{}^\circ C\] done
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B)
\[125{}^\circ C\] done
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C)
\[150{}^\circ C\] done
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D)
\[200{}^\circ C\] done
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question_answer24)
During constant temperature, we feel colder on a day when the relative humidity will be
A)
25% done
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B)
12.5% done
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C)
50% done
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D)
75% done
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question_answer25)
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)
\[\frac{{{c}_{1}}{{T}_{1}}+{{c}_{2}}{{T}_{2}}+{{c}_{3}}{{T}_{3}}}{{{m}_{1}}{{c}_{1}}+{{m}_{2}}{{c}_{2}}+{{m}_{3}}{{c}_{3}}}\] done
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B)
\[\frac{{{m}_{1}}{{c}_{1}}{{T}_{1}}+{{m}_{2}}{{c}_{2}}{{T}_{2}}+{{m}_{3}}{{c}_{3}}{{T}_{3}}}{{{m}_{1}}{{c}_{1}}+{{m}_{2}}{{c}_{2}}+{{m}_{3}}{{c}_{3}}}\] done
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C)
\[\frac{{{m}_{1}}{{c}_{1}}{{T}_{1}}+{{m}_{2}}{{c}_{2}}{{T}_{2}}+{{m}_{3}}{{c}_{3}}{{T}_{3}}}{{{m}_{1}}{{T}_{1}}+{{m}_{2}}{{T}_{2}}+{{m}_{3}}{{T}_{3}}}\] done
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D)
\[\frac{{{m}_{1}}{{T}_{1}}+{{m}_{2}}{{T}_{2}}+{{m}_{3}}{{T}_{3}}}{{{c}_{1}}{{T}_{1}}+{{c}_{2}}{{T}_{2}}+{{c}_{3}}{{T}_{3}}}\] done
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question_answer26)
Thermoelectric thermometer is based on
A)
Photoelectric effect done
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B)
Seeback effect done
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C)
Compton effect done
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D)
Joule effect done
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question_answer27)
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 done
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B)
313 done
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C)
574.25 done
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D)
301.25 done
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question_answer28)
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)
\[135{}^\circ C\] done
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B)
\[125{}^\circ C\] done
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C)
\[112{}^\circ C\] done
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D)
\[100{}^\circ C\] done
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question_answer29)
A uniform metal rod is used as a bar pendulum. If the room temperature rises by \[10{}^\circ C\], and the coefficient of linear expansion of the metal of the rod is \[2\times {{10}^{-\,6}}\text{per}\,{}^\circ C\], the period of the pendulum will have percentage increase of
A)
\[-\,2\times {{10}^{-\,3}}\] done
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B)
\[-\,1\times {{10}^{-\,3}}\] done
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C)
\[2\times {{10}^{-\,3}}\] done
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D)
\[1\times {{10}^{-\,3}}\] done
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question_answer30)
A solid ball of metal has a concentric spherical cavity within it. If the ball is heated, the volume of the cavity will
A)
Increase done
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B)
Decrease done
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C)
Remain unaffected done
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D)
None of these done
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question_answer31)
A cylindrical metal rod of length \[{{L}_{0}}\] is shaped into a ring with a small gap as shown. On heating the system
A)
x decreases, r and d increase done
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B)
x and r increase, d decreases done
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C)
x, r and d all increase done
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D)
Data insufficient to arrive at a conclusion done
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question_answer32)
Melting point of ice
A)
Increases with increasing pressure done
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B)
Decreases with increasing pressure done
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C)
Is independent of pressure done
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D)
Is proportional to pressure done
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question_answer33)
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 done
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B)
150 cal done
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C)
60 cal done
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D)
6 cal done
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question_answer34)
The mechanical equivalent of heat J is
A)
A constant done
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B)
A physical quantity done
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C)
A conversion factor done
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D)
None of the above done
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question_answer35)
Calorimeters are made of which of the following
A)
Glass done
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B)
Metal done
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C)
Wood done
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D)
Either [a] or [c] done
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question_answer36)
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)
\[7.1{}^\circ C\] done
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B)
\[9.2{}^\circ C\] done
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C)
\[10.5{}^\circ C\] done
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D)
\[12.1{}^\circ C\] done
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question_answer37)
Dry ice is
A)
Ice cube done
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B)
Sodium chloride done
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C)
Liquid nitrogen done
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D)
Solid carbon dioxide done
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question_answer38)
The temperature of the sun is measured with
A)
Platinum thermometer done
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B)
Gas thermometer done
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C)
Pyrometer done
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D)
Vapour pressure thermometer done
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question_answer39)
At what temperature the centigrade (Celsius) and Fahrenheit, readings are the same
A)
\[\text{ }40{}^\circ \] done
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B)
\[+\text{ }40{}^\circ \] done
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C)
\[36.6{}^\circ \] done
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D)
\[\text{ }37{}^\circ \] done
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question_answer40)
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)
\[\frac{\frac{1}{2}\alpha \,t\times 864000}{1-\frac{\alpha \,t}{2}}\] done
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B)
\[\frac{1}{2}\alpha \,t\times \,86400\] done
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C)
\[\frac{\frac{1}{2}\alpha \,t\times 86400}{{{\left( 1-\,\frac{\alpha \,t}{2} \right)}^{2}}}\] done
clear
D)
\[\frac{\frac{1}{2}\alpha \,t\times 86400}{1+\frac{\alpha \,t}{2}}\] done
clear
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