A 100 watt bulb is used for 5 hours daily and four 60 watt bulbs are used for 5 hours daily. Calculate the energy consumed (in kWh) in the month of January.

A tourch bulb is rated at 3 V and 600 mA. Calculate a) Power b) Resistance c) Energy consumed if it is used for 4 hour.

(i) A torch bulb is rated at 3V and 600 ma . Calculate it's (a) power (b) resistance (c) energy consumed if it used for 4 hours. (ii) Why does sound travel faster on a rainy day than on a dry day ?

An electric iron has a resistance of 80 Omega and is connected to a source of 200 V. If it is used for two hours then Calculate the electrical energy spent.

(i) A torch bulb is rated at 3V and 600 mA. Calculate, (a) power (b) resistance (c ) energy consumed if it is used for 4 hours. (ii) Calculate the mass of a body weighing 100 dyne. g=10m//s^(2) .

A manufacturer has 3 machines I, II and III installed in his factory. Machines I and II are capable of being operated for utmost 12 hours whereas machine III must be operated atleast for 5 hours a day. He produces only two items A and B each requiring the use of three machines. The number of hours required for producing 1 unit of each of the items A and B on the three machines are given below. He makes a profit of Rs 7600 on item A and Rs 400 on item B. Assume that he can sell all that he produces. (i) Formulate this as a linear programming problem. (ii) Solve the L.P.P by corner point method.

The lower surface of a slab of stone of face-area 3600cm^(2) and thickness 10cm is exposed to steam at 100^(@)C . A block of ice at 0^(@)C rests on the upper surface of the slab. 4.8g of ice melts in one hour. Calculate the thermal conductivity of the stone. Latent heat of fusion of ice =3.36 xx 10^(5) J kg^(-1)

Water falling from a 50 m high fall is to be used for generating electric enegy. If 1.8xx10^5kg of water falls per hour and half the gravitational potential energyh can be converted into electric energy, how many 100 W lamps can be it?