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

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

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प्रश्न

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

लघु उत्तर
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उत्तर

Tungsten metal is used to make solenoid type coil in an electric bulb because:

  • Tungsten metal has high resistance and high melting point (nearly 3422°C)
  • Because of current it gets heated at high temperature and emits  light.
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2018-2019 (March) Balbharati Model Question Paper Set 2

संबंधित प्रश्‍न

Write Joule's law of heating.


An electric heater is connected to the 230 V mains supply. A current of 8 A flows through the heater. 

(a) How much charge flows around the circuit each second?


What is nichrome? State its one use.


How does the resistance of a wire vary with its: 

 diameter? 

 


Why is a series arrangement not used for connecting domestic electrical appliances in a circuit?


An electric kettle rated at 220 V, 2.2 kW, works for 3 hours. Find the energy consumed and the current drawn.


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


Name the material which is used for making the filaments of an electric bulb.


Identify the figure and give its use.


An electric iron of 1100 W is operated for 2 hrs daily. What will be the electrical consumption expenses for that in the month of April? (The electric company charges Rs 5 per unit of energy).


Give scientific reason :
In the electric equipment producing heat e.g. iron, electric heater, boiler, toaster, etc., an alloy such as Nichrome is used, not pure metals.


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.


The ‘live’ and the ‘neutral’ wires have potential difference of _______.


Which of the following substance contracts on heating?


Find the odd one out and give its explanation.


What is the heating effect of electric current?


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


Write scientific reason.

A coil made up of alloy Nichrome is used in the electric heater cooker as a resistor.


When does overloading occur?


Name some devices that run using heat effect of electric current


Which of the following is correct?


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


An electric bulb is connected to a 220 V generator. The current is 0.50 A. What is the power of the bulb?


How does use of a fuse wire protect electrical appliances?


Why is parallel arrangement used in domestic wiring?


Three incandescent bulbs of 100 W each are connected in series in an electric circuit. In another circuit another set of three bulbs of the same wattage are connected in parallel to the same source.

  1. Will the bulb in the two circuits glow with the same brightness? Justify your answer.
  2. Now let one bulb in both the circuits get fused. Will the rest of the bulbs continue to glow in each circuit? Give reason.

(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).


Name two electric devices for each where

  1. heating effect of current is used and
  2. magnetic effect of current is used.

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.


An MCB can be used instead of a fuse in an electrical circuit.


What are the uses of electromagnets?


What are the factors affecting heating effect of electric current?


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

What is a trip switch?


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?


Find the odd one out.


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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