मराठी
महाराष्ट्र राज्य शिक्षण मंडळएस.एस.सी (इंग्रजी माध्यम) इयत्ता १० वी

These days when current in the circuit suddenly increases _______ switches are used.

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प्रश्न

These days when current in the circuit suddenly increases _______ switches are used.

पर्याय

  • MCA

  • MCC

  • MCD

  • MCB

MCQ
रिकाम्या जागा भरा
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उत्तर

These days when current in the circuit suddenly increases MCB switches are used.

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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 4: Effects of electric current - Choose the correct option. [पृष्ठ ४]

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एससीईआरटी महाराष्ट्र Science and Technology Part 1 [English] Standard 10 Maharashtra State Board
पाठ 4 Effects of electric current
Choose the correct option. | Q 6. | पृष्ठ ४

संबंधित प्रश्‍न

Compute the heat generated while transferring 96000 coulomb of charge in one hour through a potential difference of 50 V.


An electric iron of resistance 20 Ω takes a current of 5 A. Calculate the heat developed in 30 s.


Why are the conductors of electric heating devices, such as bread-toasters and electric irons, made of an alloy rather than a pure metal?


How does the resistance of a wire vary with its area of cross-section?


Write Joule's law of heating.


An electric iron of resistance 20 ohms draws a current of 5 amperes. Calculate the heat produced in 30 seconds.


 How much heat will an instrument of 12 W produce in one minute if it is connected to the heat produced by it?  


What is meant by the heating effect of current? Give two applications of the heating effect of current. 


An electric fuse works on the:
(a) chemical effect of current
(b) magnetic effect of current
(c) lighting effect of current
(d) heating effect of current


The heat produced in a wire of resistance 'x' when a current 'y' flows through it in time 'z' is given by:

(a) x2 × y × z
(bx × z × y2
(cy × z2 × x
(dy × z × 


An electric iron is connected to the mains power supply of 220 V. When the electric iron is adjusted at 'minimum heating' it consumes a power of 360 W but at 'maximum heating' it takes a power of 840 W. Calculate the current and resistance in each case. 


Which electric heating device in your home do you think have resistors which control the flow of electricity?


Give a scientific reason:

For electric power transmission, copper or aluminium wire is used.


Give Scientific reason.

In practice, the unit kWh is used for the measurement of electrical energy, rather than joule.


Name the factors on which the heat produced in a wire depends when current is passed in it, and state how does it depend on the factors stated by you.


What is the heating effect of electric current?


Which metal is used to make the filament of an electric bulb?


Right or wrong sentence.

Live wire and neutral wires have a 220 V potential difference.


What does overloading cause?


True or False – If False give the correct answer

The fuse wire does not melts whenever there is overload in the wiring.


Heating effect of current is called ______


Which of the following is correct?


An electric iron consumes energy at the rate of 420 W when heating is at the maximum rate and 180 W when heating is at the minimum rate. The applied voltage is 220 V. What is the current in each case?


The heating element of an electric iron is made up of:


An electric kettle consumes 1 kW of electric power when operated at 220 V. A fuse wire of what rating must be used for it?


An electric cell produces electricity from the ______ ______ in it.


Name a few appliances which work on the basis of the heating effect of current.


What is a trip switch?


The following is not a safety device.


An electrochemical cell converts ______ energy into ______ energy.


Find the odd one out.


In the electric equipment producing heat like iron, electric heater, boiler, toaster etc., an alloy such as nichrome is used, not pure metals.


In a set up the students coated iron nails with zinc metal and noted that, iron nails coated with zinc prevents rusting. They also observed that zinc initially acts as a physical barrier, but an extra advantage of using zinc is that it continues to prevent rusting even if the layer of zinc is damaged. Name this process of rust prevention and give any two other methods to prevent rusting.


State the law that explains the heating effect of current with respect to the measurable properties in an electrical circuit.


Anannya responded to the question: Why do electrical appliances with metallic bodies are connected to the mains through a three-pin plug, whereas an electric bulb can be connected with a two-pin plug?

She wrote: Three-pin connections reduce heating of connecting wires.

  1. Is her answer correct or incorrect? Justify.
  2. What is the function of a fuse in a domestic circuit?

An electric iron is rated 220 V, 2 kW. If the iron is used for 3h daily find the cost of running it for one week if it costs ₹ 4.25 per kWh.


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