English
Maharashtra State BoardSSC (English Medium) 10th Standard

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

Advertisements
Advertisements

Question

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

One Line Answer
Advertisements

Solution

Tungsten metal is used to make the filament of an electric bulb.

shaalaa.com
  Is there an error in this question or solution?
Chapter 4: Effects of electric current - Answer in one sentence. [Page 13]

APPEARS IN

SCERT Maharashtra Science and Technology Part 1 [English] Standard 10 Maharashtra State Board
Chapter 4 Effects of electric current
Answer in one sentence. | Q 2. | Page 13

RELATED QUESTIONS

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


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


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?


Give two reasons why nichrome alloy is used for making the heating elements of electrical appliances.


How does the resistance of a wire vary with its: 

 diameter? 

 


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?  


The elements of electrical heating devices are usually made of:

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


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


Give a scientific reason.

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


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.


Statement 1 : Electric current ( flow of electrons ) creates heat in the resistor.
Statement 2 : Heat in the resistor is created according to the rule of energy conservation.
Explain Statement 1 with the help of Statement 2.


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.


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


Which of the following substance contracts on heating?


How can overloading be avoided?


Which of the following is correct?


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.

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


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.


When a switch is in OFF position,

  1. circuit starting from the positive terminal of the cell stops at the switch.
  2. circuit is open.
  3. no current flows through it.
  4. current flows after some time. 

Choose the combination of correct answer from the following.


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?


A trip switch is a ______ safety device.


1 kWh is equal to ______.


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.


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?


The graph of voltage vs current for four different materials is shown below.

Which of these four materials would be used for making filament of bulb?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×