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प्रश्न
Find the odd one out and justify it.
Fuse wire, M.C.B., Rubber Gloves, Generator
उत्तर
Generator.
All others are related to safety measures to avoid mishap due to electricity.
APPEARS IN
संबंधित प्रश्न
Draw a schematic diagram of a circuit consisting of a battery of three cells of 2 V each, a 5 Ω resistor, an 8 Ω resistor, and a 12 Ω resistor, and a plug key, all connected in series.
What do the following symbols mean in circuit diagrams?
What do the following symbols mean in circuit diagrams?
Draw the labelled diagram of an electric circuit comprising of a cell, a resistance, an ammeter, a voltmeter and a closed switch (or closed plug key). Which of the two has a large resistance : an ammeter or a voltmeter?
Explain with the help of a labelled circuit diagram how you will find the resistance of a combination of three resistors, or resistance R1, R2 and R3, joined in parallel. Also mention how you will connect the ammeter and the voltmeter in the circuit when measuring the current in the circuit and the potential difference across one of the three resistors of the combination.
Two tungsten bulbs of power 50 W and 60 W work on 220 V potential difference. If they are connected in parallel, how much current will flow in the main conductor?
Resistances R1, R2, R3 and R4 are connected as shown in the figure. S1 and S2 are two keys. Discuss the current flowing in the circuit in the following cases.
- Both S1 and S2 are closed.
- Both S1 and S2 are open.
- S1 is closed but S2 is open.
Distinguish between a closed circuit and an open circuit, with the use of suitable labelled diagrams.
Match the column ‘A’ with column ‘B’.
|
Column ‘A’
|
Column ‘B’ |
|
(1) Eka - boron
|
(a) Germanium
|
|
(2) Eka - Aluminium
|
(b) Scandium
|
|
(3) Eka - Silicon
|
(c) Gallium |
Draw a neat diagram showing a closed electric circuit.
Name the instrument used to control current in an electric circuit.
If you touch an electric wire carrying current you get a shock, but if on the same wire the birds sit they do not get any shock/current. Explain why?
Find the odd one out and give its explanation.
In the given circuit diagram, which of the given switch(s) should be closed. So that only bulb A glows.
Higher Order Question
A student made a circuit by using an electric cell, a switch, a torch bulb (fitted in the bulb holder), and copper connecting wires. When he turned on the switch, the torch bulb did not glow at all. The student checked the circuit and found that all the wire connections were tight.
- What could be the possible reason for the torch bulb not glowing even when the circuit appears to be complete?
Draw the circuit diagram for the following series connection
Which of the following a simple circuit must-have?
Three bulbs are connected end to end from the battery. This connection is called _______.
Assertion: People struck by lightning receive a severe electrical shock.
Reason: Lightning carries very high voltage.
What is electric circuit?
Instead of metal wires, a jute string can be used to make a circuit.
The rate of flow of electric charges in a circuit is called ______.
In the following circuits (Figure), heat produced in the resistor or combination of resistors connected to a 12 V battery will be
 |
 |
 |
| (i) | (ii) | (iii) |
In an electrical circuit three incandescent bulbs A, B and C of rating 40 W, 60 W and 100 W respectively are connected in parallel to an electric source. Which of the following is likely to happen regarding their brightness?
In an electrical circuit two resistors of 2 Ω and 4 Ω respectively are connected in series to a 6 V battery. The heat dissipated by the 4 Ω resistor in 5 s will be
A child has drawn the electric circuit to study Ohm’s law as shown in Figure. His teacher told that the circuit diagram needs correction. Study the circuit diagram and redraw it after making all corrections.
Name the device used these days in place of electric fuses in electrical circuits.
In an electric circuit a fuse is a _________ _______ to prevent possible fire.
Draw the symbols of the following circuit components.
switch in off position
In the above circuit, if the current reading in the ammeter A is 2A, what would be the value of R1?
Match the following
| 1. | Insulator | a. | Coulomb |
| 2. | Conductor | b. | Electric circuit |
| 3. | Closed path | c. | Copper |
| 4. | Electric charge | d. | Rubber |
What are the essential components of an electric circuit?
In the following arrangement shown in Fig. 12.2, the bulb will not glow if the ends A and B are connected with
In which of the following circuits A, B, and C gave in Fig. 12.4, the cell will be used up very rapidly?
Paheli connected two bulbs to a cell as shown in Fig. 12.8.
She found that filament of bulb B is broken. Will the bulb A glow in this circuit? Give reason.
