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

Identify the figure and give its use.

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प्रश्न

Identify the figure and give its use.

Identify a figure and write one use of it:

वर्गीकरण करा
लघु उत्तर
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उत्तर

  • Figure: MCB (Miniature Circuit Breaker)
  • Uses: An MCB is a device which functions as a fuse but does not require replacement. MCB falls down to break the circuit when a heavy amount of current flows through it. Once the fault is rectified, the MCB is reset.
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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 4: Effects of electric current - Exercise [पृष्ठ ६१]

संबंधित प्रश्‍न

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


A heating coil has a resistance of 200 Ω. At what rate will heat be produced in it when a current of 2.5 A flows through it?


A resistance of 25 Ω is connected to a 12 V battery. Calculate the heat energy in joules generated per minute.


The current passing through a room heater has been halved. What will happen to the heat produced by it?


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 elements of electrical heating devices are usually made of:

(a) tungsten
(b) bronze
(c) nichrome
(d) argon


Which of the following characteristic is not suitable for a fuse wire?

(a) thin and short
(b) thick and short
(c) low melting point
(d) higher resistance than rest of wiring


If the current flowing through a fixed resistor is halved, the heat produced in it will become:


How does the wire in the filament of a light bulb behave differently to the other wires in the circuit when the current flows?

What property of the filament wire accounts for this difference?


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?


Solve the following example.

Two tungsten bulbs of wattage 100 W and 60 W power work on 220 V potential difference. If they are connected in parallel, how much current will flow in the main conductor? 


Why does tungsten metal used to make solenoid type coil in an electric bulb?


In an electric bulb, coil of _______ metal is used.


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


Find the odd one out and give its explanation.


What is used to turn off the sudden increase in current in the electrical circuit of the house nowadays?


Write two devices based on the heating effect of electric current.


Right or wrong sentence.

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


Name any two appliances which works on the phenomenon of heating effect of electric current.


How can overloading be avoided?


Explain the application of heating effect of electric current in an electric bulb with a diagram.


Define fuse.


Name some devices that run using heat effect of electric current


Which of the following is correct?


A fuse wire repeatedly gets burnt when used with a good heater. It is advised to use a fuse wire of:


Why is parallel arrangement used in domestic wiring?


(a) Observe the diagram given below and state whether the bulb will glow or not when we switch on K.

(b) Is it safe to handle the bulb when the switch is OFF?

(c) Give a reason for your answer in (b).


Paheli took a wire of length 10 cm. Boojho took a wire of 5 cm of the same material and thickness. Both of them connected the wires as shown in the circuit given in the following figure. The current flowing in both the circuits is the same.

  1. Will the heat produced in both cases be equal? Explain.
  2. Will the heat produced be the same if the wires taken by them are of equal lengths but of different thickness? Explain.


Fuse is a strip of alloy wire which is made up of lead and tin with a very low ______.


Match the following

1. Bulb a. Conductor
2. Electroplating b.

Insulator

3. Pure water c.  Heating effect of current
4. Salt solution d. Chemical effect of current

Name the effect of the current responsible for the glow of the bulb in an electrical circuit.


A student boils water in an electric kettle for 20 minutes. Using the same mains supply he wants to reduce the boiling time of water. To do so should he increase or decrease the length of the heating element? Justify your answer.


A trip switch is a ______ safety device.


If 220 V potential difference is applied across an electric bulb, a current of 0.45 A flows in the bulb. What must be the power of the bulb?


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?


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