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

Identify the figure and give its use. - Science and Technology 1

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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: Cartridge type fuse/Electric fuse

Uses: 

  1. It is a safety device that protects the wiring from overheating caused by an excessive current supply.
  2. It melts when a high current travels through the circuit, causing the circuit to break and the current to stop flowing through it.
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पाठ 4: Effects of electric current - Exercises [पृष्ठ ६१]

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बालभारती Science and Technology 1 [English] Standard 10 Maharashtra State Board
पाठ 4 Effects of electric current
Exercises | Q 11.1 | पृष्ठ ६१

संबंधित प्रश्‍न

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


What is nichrome? State its one use.


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.


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


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


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


Explain why, the current that makes the heater element very hot, only slightly warms the connecting wires leading to the heater.


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


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


The current passing through an electric kettle has been doubled. The heat produced will become:

(a) half
(b) double
(c) four time
(d) one-fourth 


The elements of electrical heating devices are usually made of:

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


Two exactly similar heating resistances are connected (i) in series, and (ii) in parallel, in two different circuits, one by one. If the same current is passed through both the combinations, is more heat obtained per minute when they are connected in series or when they are connected in parallel? Give reason for your answer.


Three heaters each rated 250 W, 100 V are connected in parallel to a 100 V supply. Calculate:

  1. the total current taken from the supply
  2. the resistance of each heater and
  3. the energy supplied in kWh to the three heaters in 5 hours.

Give a scientific reason.

Tungsten metal is used to make a solenoid type coil in an electric bulb.


Name any six domestic appliances based on the heating effect of electric current.


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


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


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


Mark the correct choice

  1. Assertion: Electric appliances with a metallic body have three wire connections.
  2. Reason: Three-pin connections reduce the heating of the connecting wires.

Assertion: Bending of wire decreases the resistance of the electric wire.

Reason: The resistance of a conductor depends on length, thickness, nature of material and temperature of the conductor.


How does use of a fuse wire protect electrical appliances?


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.

What is Joule’s heating effect? How can it be demonstrated experimentally? List its four applications in daily life.


An electric component used as a safety device is electric circuit is ______.


Unscramble the following words:

SFEU


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.


What are the uses of electromagnets?


What are the factors affecting heating effect of electric current?


______ wire is used in the filament of the bulbs.


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

Assertion: A current-carrying wire should be charged.
Reason: The current in a wire is due to the flow of free electrons in a definite direction.


An electrochemical cell converts ______ energy into ______ energy.


A fuse is used in an electric circuit to stop high currents flowing through the circuit.


Tara, after completing her exams, went to her grandmother's house along with her younger brother Rahul. One day, Rahul came home after playing and switched on the fan and air conditioner. At the same time, his grandmother was preparing a milkshake for him using a mixer. Suddenly, they heard a big sound and the electricity of the house got shut down. Tara is called an electrician. He said the main reason for supply to shut down was overloading.

  1. What is overloading?
  2. Is overloading and short the same? When does short-circuiting take place?
  3. How can the effects of overloading be avoided?

In which of the following applications of Iron, rusting will occur most? Support your answer with valid reason.

A B C D

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.


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