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Start learning 50% faster. Sign in nowLet the speed of boat in still water be a km/hr and that of stream be b km/hr. Therefore, 30/(a + b)= 3 ⇒ a + b = 10 ………..(i) 30/(a – b)= 5 ⇒ a + b = 6 ………..(ii) On adding, eq (i) and (ii) ⇒ 2a = 16 km/hr ⇒ a = 8 km/hr
Modern periodic table has ______ groups and ______ periods.
The common name of hydrogen peroxide is:
Which of the following fibers will melt when heated?
Match the following columns and choose the correct option:
Column I A. Leishmania donovani B. Trypanosoma gambiense C. Entamoeba histolytica D. W...
Which of the following is correct regarding isobars?
I. They have different atomic numbers
II. The have same mass numbers
Alkali metals have ______.
I. low melting points
II. low densities
Which metal remains liquid at room temperature?
Aromatic hydrocarbons contain at least how many benzene rings in their molecules?
On a clean glass plate, a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because:
Which bond is weakest in nature?
