Chemistry-
General
Easy
Question
The decreasing order of strength of following bases is:
The correct answer is:
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Two rods ofsamelengthandareaofcross-sectionA1and A2havetheirendsatthesametemperature.If K1and K2 are their thermal conductivities,c1 and c2 are their specific heatsandd1andd2aretheirdensities,thentherateofflow of heat is the same in both the rods if
Two rods ofsamelengthandareaofcross-sectionA1and A2havetheirendsatthesametemperature.If K1and K2 are their thermal conductivities,c1 and c2 are their specific heatsandd1andd2aretheirdensities,thentherateofflow of heat is the same in both the rods if
Physics-General
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In a room where the temperature is 30
C,a body cools from 61C to 59C in 4 minutes. The time (in minutes)taken by the body to cool from 51c to 49Cwill be:
In a room where the temperature is 30C,a body cools from 61C to 59C in 4 minutes. The time (in minutes)taken by the body to cool from 51c to 49Cwill be:
Physics-General
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Steam at 100C is passed in to 20gofwateratl0C.When water acquires a temperature of 80C, the mass of water present will be:
Steam at 100C is passed in to 20gofwateratl0C.When water acquires a temperature of 80C, the mass of water present will be:
Physics-General
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If
are efficient of linear, area and volume expansion respectively, then
Ifare efficient of linear, area and volume expansion respectively, then
Physics-General
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Two spheres of different materials one with double the radius and one-fourth wall thickness of the other are filled with ice. If the time taken for complete melting of ice in the larger sphere is 25 minute and for smaller one is 16 minute, the ratio of thermal conductivities of the materials of larger spheres to that of smaller sphere is
Two spheres of different materials one with double the radius and one-fourth wall thickness of the other are filled with ice. If the time taken for complete melting of ice in the larger sphere is 25 minute and for smaller one is 16 minute, the ratio of thermal conductivities of the materials of larger spheres to that of smaller sphere is
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A long metallicbar is carrying heat from one of its ends to the other end under steady-state. The variation of temperature 0 along the length x of the bar from its hot end is best described by which of the following figures?
A long metallicbar is carrying heat from one of its ends to the other end under steady-state. The variation of temperature 0 along the length x of the bar from its hot end is best described by which of the following figures?
Physics-General
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Two rods of same length and transfer a given amount of heat12second,whentheyarejoined as shown in figure (i).But when they are joined as shown in figure (ii), then they will transfer same heat in same
conditions in
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conditions in
Physics-General
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Two rods, one of aluminum and the other made of steel having initial length 
and 
are connected to get her to expansion for aluminum and steel are 
and a s and respectively. If the length of each rod increases by the same amount when their temperature are raised by tC, then find the ratio 
Two rods, one of aluminum and the other made of steel having initial length and are connected to get her to expansion for aluminum and steel are and a s and respectively. If the length of each rod increases by the same amount when their temperature are raised by tC, then find the ratio
Physics-General
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When the temperature of a rod increases from t to
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When the temperature of a rod increases from t to, its moment of inertia increases from I to If be the co efficient of line are x pansion of the rod, then the value of
Physics-General
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A rectangular block is heated from 0cto100C. Thepercentageincreaseinitslengthis0.10%.Whatwillbethepercentage increase in its volume?
A rectangular block is heated from 0cto100C. Thepercentageincreaseinitslengthis0.10%.Whatwillbethepercentage increase in its volume?
Physics-General
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The filament of an evacuated light bulb has a length 10 cm, diameter 0.2 mm and emissivity 0.2. Calculate the power itradiatesat2000K.(cr=5.67
10-8W/m2K4)
The filament of an evacuated light bulb has a length 10 cm, diameter 0.2 mm and emissivity 0.2. Calculate the power itradiatesat2000K.(cr=5.6710-8W/m2K4)
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A wall has two layers A and B made of different materials. The thickness of both layers is the same. The normal conductivity of A and Bare KA and KB such that KA= 3KB.Thetemperatureacrossthewallis20C.Inthermalequilibrium
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Which oft he following statements is/are false about mode of heat transfer?
Which oft he following statements is/are false about mode of heat transfer?
Physics-General
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if light with wavelength 0.50 
falls on a slit of width 10 and at an angle 
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if light with wavelength 0.50 falls on a slit of width 10 and at an angle = 300 to its normal. Then angular position of first minima located on right sides of the central Fraunh offer’s diffraction will be at
Physics-General
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100 cm3 of water is compressed from 0.5 atmosphere pressure The work done is x. The work done in compressing 100 cm3 of air from 0.5 atmosphere to 5 atmosphere is y. Then:
100 cm3 of water is compressed from 0.5 atmosphere pressure The work done is x. The work done in compressing 100 cm3 of air from 0.5 atmosphere to 5 atmosphere is y. Then:
Physics-General
