Nichrome wire is commonly used in electrical heating devices because it
- Ais a good conductor of electricity.
- ✓generates more heat for a given current.
- Cis cheaper than copper.
- Dis an insulator of electricity.
Answer: B.
View full solution →Question types
Electricity: Magnetic and Heating Effects question types
101 questions across 9 question groups — pick any mix to generate a Science paper with step-by-step answer keys.
101
Questions
9
Question groups
5
Question types
01
M.C.Q. [I MARKS]
20 Q→02as requested in detail. [5 marks ]
3 Q→03Fill in the blanks: [1 M]
15 Q→04questions in short. [2 marks ]
18 Q→05true or false. [1 M]
17 Q→06questions in short. [3 marks ]
15 Q→07questions in details [4 marks ]
6 Q→08questions in on sentence. [1 M]
4 Q→09Match the Following.
3 Q→Sample Questions
Electricity: Magnetic and Heating Effects questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
An electric current flows through a nichrome wire for a short time.
(i) The wire becomes warm.
(ii) A magnetic compass placed below the wire is deflected.
(i) The wire becomes warm.
(ii) A magnetic compass placed below the wire is deflected.
- AOnly (i) is correct
- BOnly (ii) is correct
- ✓Both (i) and (ii) are correct
- DBoth (i) and (ii) are not correct
Answer: C.
View full solution →Assertion (A): While making elements of heating appliances from wires of materials like nichrome, the length of the wires is increased by making coils of the wire.
Reason (R): The increase in the length of the conducting wire does not change the heating effect of the electric current.
Reason (R): The increase in the length of the conducting wire does not change the heating effect of the electric current.
- ABoth (A) and (R) are true, and (R) is the correct explanation of (A).
- BBoth (A) and (R) are true, but (R) is not the correct explanation of (A).
- C(A) is true, but (R) is false.
- D(A) is false, but (R) is true.
Assertion (A): When an electric current passes through a conductor, it gets heated. This warming is called the heating effect of electric current.
Reason (R): When electric current flows through any conductor, it faces some opposition or resistance to its flow. This resistance converts some electric energy to heat energy.
Reason (R): When electric current flows through any conductor, it faces some opposition or resistance to its flow. This resistance converts some electric energy to heat energy.
- ABoth (A) and (R) are true, and (R) is the correct explanation of (A).
- BBoth (A) and (R) are true, but (R) is not the correct explanation of (A).
- C(A) is true, but (R) is false.
- D(A) is false, but (R) is true.
The strength of the electromagnet does NOT change with a change in
- AThe nature and thickness of the conductor
- BTime duration for which the current is passed
- CStrength of the electric current
- DThe number of turns in the coil
Look at the Figure. If the compass is placed near the coil deflects:
1. Draw an arrow on the diagram to show the path of the electric current.
2. Explain why the compass needle moves when current flows.
3. Predict what would happen to the deflection if you reverse the battery terminals.
1. Draw an arrow on the diagram to show the path of the electric current.
2. Explain why the compass needle moves when current flows.
3. Predict what would happen to the deflection if you reverse the battery terminals.
What is the heating effect of electric current? Explain with examples.
Explain the Structure of a Voltaic cell.
A current carrying coil behaves like a __________
The solution used in a Voltaic cell is called __________
Batteries used in laptops, backup devices like inverters and in motor vehicles are bigger batteries that are _______________
While making elements of heating appliances from wires of these materials, length of the wires is _______________ by making coils of the wire.
Example of the use of heating effect of electric current in industry are high _______________ furnaces.
A Voltaic cell, also known as a Galvanic cell, contains two metal plates made of different materials and a liquid called an electrolyte, placed in a glass or plastic container. The plates, called electrodes, are partly dipped in the electrolyte, which is usually a weak acid or a salt solution. A chemical reaction between the plates and the electrolyte produces electricity.
(a) In what way is the Voltaic cell different from the dry cell?
(b) Who discovered the Voltaic or the Galvanic cell? What was the difference of opinion between the two scientists about the electricity generation by the cell, and how was it resolved?
(a) In what way is the Voltaic cell different from the dry cell?
(b) Who discovered the Voltaic or the Galvanic cell? What was the difference of opinion between the two scientists about the electricity generation by the cell, and how was it resolved?
Write an activity to show that the electromagnets have two poles like a bar magnet.
Explain the magnetic effect of electric current. On what factors does the strength of an electromagnet depend? What way the lifting electromagnets used in industry?
Why are Voltaic cells not convenient as a portable source of electricity? What improvements have made rechargeable cells more widely used compared to dry cells?
Explain the structure and functioning of a dry cell. What precautions should be taken so that the cell does not weaken quickly or suddenly be used up?
An electromagnet, using a single cell, attracts more iron paper clips than the same electromagnet with a battery of 2 cells.
A coil becomes an electromagnet only when an electric current flows through it.
Dry cells are less portable compared to Voltaic cells.
A doorbell is an example of the heating effect of electric current.
The dry cells are single-use cells. Once these become weak, they have to be disposed of.
While doing the activity for the electromagnet, did you also notice that the wire ends got warm? Why would that happen?
Can we use electric current to make a magnet?
Neha keeps the coil the same way as in Activity but slides the iron nail out, leaving only the coiled wire. Will the coil still deflect the compass? If yes, will the deflection be more or less than before?
In Figure (below), in which case, the LED will glow when the switch is closed?
Electric heating devices (like an electric heater or a stove) are often considered more convenient than traditional heating methods (like burning firewood or charcoal). Give reasons to support this statement, considering societal impact.
Can we also make our Voltaic cell using easily available materials?
Are electromagnets also used in real life, for lifting objects?
Does an electromagnet also have two poles like a bar magnet?
Suppose Sumana forgets to move the switch of her lifting electromagnet model to the OFF position (in the introduction story). After some time, the iron nail no longer picks up the iron paper clips, but the wire wrapped around the iron nail is still warm. Why did the lifting electromagnet stop lifting the clips? Give possible reasons.
What is the magnetic effect of an electric current? Explain with examples.
Name three types of portable sources of electricity.
Define magnetic field.
What is an electrode?
What is an electrolyte?
| Column A | Column B |
| Q.1. Voltaic Cell | (a) Best suited for an electric heater |
| Q.2. Electric iron | (b) Works on magnetic effect of electric current |
| Q.3. Nichrome wire | (c) Works on the heating effect of electric current |
| Q.4. Electromagnet | (d) Generates electricity by chemical reactions |
| Clounm A | Column B |
| Q.1. Example of the heating effect of electric current | (a) Dry cell electrolyte |
| Q.2. Example of the magnetic effect of electric current | (b) Metallic trip over the carbon rod |
| Q.3. A weak acid or salt solution in liquid form | (c) Room heater,electric stove,hair dryer,electric icon |
| Q.4. An electrolyte in the form of a thick,moist paste | (d) Magnets in door bells,loudspeaker,electric motors,and fans |
| (e) Electrolyte in a Voltaic cell |
| Column A | Column B |
| Q.1. Examples of the heating effect of electric current | (a) North Pole and South Pole |
| Q.2. Increases the magnetic strength of an electromagnet | (b) Iron/copper, zinc/copper, zinc/silver, lead/copper |
| Q.3. Pairs of electrode materials used in Voltaic cells | (c) Number of turns in the coil |
| Q.4. Electromagnets also have | (d) Electric iron, electric kettle |
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