English
Maharashtra State BoardSSC (English Medium) 10th Standard

Find the odd one out and give its explanation. Potassium, Magnesium, Calcium, Beryllium

Advertisements
Advertisements

Question

Find the odd one out and give its explanation.

Options

  • Tungsten

  • Nichrome

  • Aluminium

  • Iron

MCQ
Advertisements

Solution

Nichrome

Explanation-

Nichrome is an alloy used for making wires, while others are soft metals.

shaalaa.com
  Is there an error in this question or solution?
Chapter 4: Effects of electric current - Find odd one out. [Page 12]

APPEARS IN

SCERT Maharashtra Science and Technology Part 1 [English] Standard 10 Maharashtra State Board
Chapter 4 Effects of electric current
Find odd one out. | Q 3. | Page 12

RELATED QUESTIONS

State four most common electrical appliances based on heating effect of electric current. Why do we use finely heated platinum wire in surgery?


Why is the tungsten used almost exclusively for filament of electric lamps?


Name any two effects of electric current.


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

  1. How much charge flows around the circuit each second?
  2. How much energy is transferred to the heater each second?

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


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


What is meant by the 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


Give Scientific reasons.

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


Write the mathematical expression for Joule’s law of heating.


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


Which of the following substance contracts on heating?


What is a short circuit?


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.


Name some devices that run using heat effect of electric current


Heating effect of current is called ______


Which of the following is correct?


An electric iron consumes energy at the rate of 420 W when heating is at the maximum rate and 180 W when heating is at the minimum rate. The applied voltage is 220 V. What is the current in each case?


A current of 1 A is drawn by a filament of an electric bulb. Number of electrons passing through a cross-section of the filament in 16 seconds would be roughly:


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


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?


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).


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


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.


______ 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

Name a few appliances which work on the basis of the heating effect of current.


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


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


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?


What is the heating effect of electric current?


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


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×