The three bells ring at 12’O clock every day. The 1st bell rings for every 15 min, 2nd bell rings for every 25 min, 3rd bell rings for every 40 min. At what time will all the bells ring again?

Two bells ring together. If the bells ring at every 3 minutes and 4 minutes respectively. After what interval of time will they ring together again ?

Two bells ring together. If the bells ring at every 3 minutes and 4 minutes respectively. After what interval of time will they ring together again ?

Prasad and Raju met in the market on 1st of this month. Prasad goes to the market every 3rd day and Raju goes every 4th day. On what day of the month will they meet again?

A house has three tube lights, two fans and a Television. Each tube light draws 40W. The fan draws 80W and the Television draws 60W. On the average all the tube lights are kept on for five hours, two fans for 12 hours and the television for five hours every day. Find the cost of electric energy used in 30 days at the of Rs. 3.00 per KWH.

The typical reaction of benzene and other aromatic compounds is electrophilic substitution. Presence of electron donating group activates the ring towards electrophilic substitution, while presence of electron withdrawing group deactivates the ring towards electrophilic substitution but at the same time activates the ring towards nucleophilic substitution. Some groups are predominantly meta directing and all of these are deactivating. Except halogen, most of the o- and p- directing groups are activating groups. (E.A.S = Electrophilic aromatic substation) The reaction of toluene with Cl_2 in presence of FeCl_3 gives predominantly:

A Rowland ring of mean radius 15 cm has 3500 turns of wire wound on a ferromagnetic core of relative permeability 800. What is the magnetic field B in the core for a magnetising current of 1.2 A ?

If a satellite has to orbit the earth in a circular path every 6 hrs, at what distance from the surface of the earth should be satellite placed (radius of earth , R_e = 6400 km ) ( Assume , (GM)/(4pi ^2) = 8.0 xx 10^(12) N// m^2 // kg Where ,G and M are gravitational constant and mass of earth and 10^(1//3) = 2.1.

Rahul's father wants to deposit some amount of money every year on the day of Rahul's birthday. On his 1^(st) birthday Rs.100, on his birthday Rs.300, on his 3^(rd) birthday Rs.600, on his birthday Rs.1000 and so on. What is the amount deposited by his father on Rahul's 15^(th) birthday?

H_(2)O_(2)+H_(2)O+1/2O(2) (1st order). Time to time the H_(2)O_(2) solution is titrated with standard acidified KMnO_(4) . The data is Time (min ) " "0" "15 KMnO_(4)"consumed")" "16ml" "2ml What is half life in minutes?