If the number of terms in the expansion of (1−x2+x24)n,x=0,is 28, then the sum of the coefficients of all the terms in this expansion, is :
For a simle pendulum, a graph is plotted between its kinetic energy (KE) and potential energy (PE) against its displacement d. Which one of the following represents these correctly ?
(Graphs are schematic and not drawn to scale)
3 g of activated charcoal was added to 50 mL. of acetic acid solution (0.06N) in a flask. After an hour it was filtered and the strength of the filtrate was found to be 0.042 N. The amount of acetic acid adsorbed (per gram of charcoal) is :
A train is moving on a straight track with speed 20ms−1. It is blowing its whistle at the frequency of 1000 Hz. The percentage change in the frequency heard by a person standing near the track as the train passes him is (speed of sound =320ms−1) close to :