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An electric refrigerator rated 400 W operates 8 hour/day. What is the cost of the energy to operate it for 30 days at Rs 3.00 per kW h? -CBSE Physics 1 AnswerA household uses the following electric appliances -CBSE physics class 101 Answer Several electric bulbs designed to be used on a 220 V electric supply line, are rated 10 W. How many lamps can be connected in parallel with each other across the two wires of 220 V line if the maximum allowable current is 5 A? -CBSE Physics 1 Answer Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are connected in parallel to electric mains supply. What current is drawn from the line if the supply voltage is 220 V? -CBSE Physics 1 AnswerA manufacturer can produce 12000 bearings per day. The manufacturer received an order of 8000 bearings per day from a customer. The cost of holding a bearing in stock is Rs.0.20 per month. Setup cost per production run is Rs.500. Assuming 300 working1 AnswerA torch bulb is rated 2.5 V and 750 mA. Calculate (i) its power, (ii) its resistance and (iii) the energy consumed if this bulb is lighted for 4 hours. -2005 CBSE Physic class 101 AnswerAn electric motor takes 5 A from a 220 V line. Determine the power of the motor and the energy consumed in 2 h. -CBSE Physics 1 AnswerWhy is an alternating current considered to be advantageous over direct current for long range transmission of electric energy? -CBSE physics class 101 AnswerWhy are coils of electric toasters and electric irons made of an alloy rather than a pure metal? -CBSE Physics 1 AnswerAn electric iron consumes energy at a rate of 840 W when heating is at the maximum rate and 360 W when the heating is at the minimum. The voltage is 220 V. What are the current and the resistance in each case? -CBSE Physics 1 AnswerWhy are the conductors of electric heating devices, such as bread-toasters and electric irons, made of an alloy rather than a pure metal?. -CBSE Physics 1 AnswerA current of 0.5 A is drawn by a filament of an electric bulb for 10 minutes. Find the amount of electric charge that flows through the circuit. -CBSE Physics1 Answer What are the environmental consequences of the increasing demand for energy? What steps would you suggest to reduce energy consumption? -CBSE Physics 1 AnswerA takes 6 days less than B to do a work. If both A and B working together can do it in 4 days, how many days will B take to finish it? Mathematics CBSE class 10 20171 AnswerMarginal cost refers to: -CBSE Economics Class 101 AnswerWhich energy is converted into electrical energy by a solar cell ? 1 AnswerImportant of advance co-operate accounting.1 AnswerThe rated nozzle flow rate and volume median diameter (VMD) of droplets of a hydraulic sprayer are 1.0 L min^-1 and 200 µm, respectively at the rated pressure of 500 kPa. If the desired nozzle flow rate is 1.5 L min^-1, the droplet diameter in µm w1 AnswerCost of a dozen pens is Rs 180 and cost of 8 ball pens is Rs 56. Find the ratio of the cost of a pen to the cost of a ball pen.-Mathematics-cbse-std 6th-Ratio and Proportion1 AnswerWhat does electric circuit mean? -CBSE Physics1 Answer