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

Which of the following substance contracts on heating?

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प्रश्न

Which of the following substance contracts on heating?

पर्याय

  • Lukewarm water

  • Ice

  • Iron

  • Mercury

MCQ
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उत्तर

Ice

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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 4: Effects of electric current - Choose the correct option. [पृष्ठ ५]

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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 11. | पृष्ठ ५

संबंधित प्रश्‍न

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


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


When current is switched ‘on’ in a room heater, it ______.


Write Joule's law of heating.


An electric room heater draws a current of 2.4 A from the 120 V supply line. What current will this room heater draw when connected to 240 V supply line?


Why does the connecting cord of an electric heater not glow hot while the heating element does?


Write down the formula for the heat produced when a current I is passed through a resistor R for time t.


Explain why, tungsten is used for making the filaments of electric bulbs.


Derive the expression for the heat produced due to a current 'I' flowing for a time interval 't' through a resistor 'R' having a potential difference 'V' across its ends. With which name is this relation known?


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


What is meant by the heating effect of current?


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


Give a scientific reason:

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


Identify the figure and give its use.


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.


Answer the following question:
what is the heating effect of the electric current? state any four applications of it?


Compute the heat generated while transferring 96000 coulombs of charge in two hours through a potential difference of 40 V.


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


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


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


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.


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


Explain the importance/uses of fuse wire.


Name any two appliances which work under the principle of heating effect of current.


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


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


Can we use the same fuse in a geyser and a television set? Explain.


Name two electric devices for each where

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

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


An electric fuse has a body made of ceramic and two points for connecting the fuse wire.


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

The following is not a safety device.


An electric fuse is a wire made up of a material having ______ melting point.


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


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