Let f(x) be a polynomial of degree four having extreme values at x=1and x=2. If (lim)x0[1+x2f(x)]=3, then f(2) is equal to :
Compound (A), C8H9Br, gives a white precipitate when warmed with alcoholic AgNO3. Oxidation of (A) gives a acid (B), C8H6O4. (B) easily forms anhydride on heating. Identify the compound (A).
Assertion : Nitrogen and Oxygen are the main components in the atmosphere but these do not react to form oxides of nitrogen.
Reason : The reaction between nitrogen and oxygen requires high temperature.
The supply voltage to a room is 120 V. The resistance of the lead wires is 6 Ω A 60 W bulb is already switched on. What is the decrease of voltage across the bulb, when a 240 W heater is switched on in parallel to the bulb?