Two identical square rods of metal are welded end to end as shown in figure (i), 20 calories of heat flows through it in 4 minutes. If the rods are welded as shown in figure (ii), the same amount of heat will flow through the rods in

The decreasing order of boiling points of 1 , 2 , 3, alcohol is:

In ΔABC, if then

Consider the following reaction, 

A liquid cools down from to in 5 minutes. The time taken to cool it from to will be

If one of the lines in the pair of stright lines given by bisects the angle between the coordinate axes, then k

Order of reactivity of halogen acids towards an alcohol is

Which of the following is an example of elimination reaction?

A body cools in a surrounding which is at a constant temperature of . Assume that of obeys Newton’s law of cooling. Its temperature is plotted against time . Tangents are drawn to the curve at the points and . These tangents meet the time axis at angles of and , as shown

The most unlikely representation of resonance structures of nitrophenoxide ion is

 is stronger acid than  because:

In the figure, area and Find area of

In the given figure, area (parallelogram ABCD) = 48 and Find area of

Hence option C is correct

In the given figure ABC is right angled at B in which BC = 15 cm, and CA = 17 cm Find the area of acute-angled triangle DBC, it being given that

Two rods P and Q have equal lengths. Their thermal conductivities are K₁ and K₂ and cross sectional areas are A₁ and A₂. When the temperature at ends of each rod are T₁ and T₂ respectively, the rate of flow of heat through P and Q will be equal, if

The graph shows the variation of temperature of one of a material with the heat supplied to it. At the substance is in the solid state. From the graph, we can conclude that