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प्रश्न
Find the odd one out and justify it.
Fuse wire, M.C.B., Rubber Gloves, Generator
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उत्तर
Generator.
All others are related to safety measures to avoid mishap due to electricity.
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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?
Draw circuit symbols for
a battery of three cells
Draw a circuit diagram to show how 3 bulbs can be lit from a battery so that 2 bulbs are controlled by the same switch the third bulb has its own switch.
Explain the construction and working of the following. Draw a neat diagram and label it.
Electric motor
How does the short circuit form?
Who will spend more electrical energy? 500 W TV Set in 30 mins, or 600 W heater in 20 mins?
The following figure shows the symbols for components used in the accompanying electrical circuit. Place them at proper places and complete the circuit.
Which law can you prove with the help of above circuit?
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.
A battery is to be formed by joining 3 dry cells with connecting wires. Show how will you connect the wires by drawing a diagram.
Write the condition required for a circuit to be a closed circuit.
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 |
Answer the following question.
With the help of a suitable circuit diagram prove that the reciprocal of the equivalent resistance of a group of resistances joined in parallel is equal to the sum of the reciprocals of the individual resistances.
How much is the potential difference between live and neutral wires?
Right or wrong sentence.
Increasing the current passing through the wire decreases the magnetic field intensity.
What is the use of earthing wire?
Flow of electricity through a closed circuit is _____.
In the circuit diagram below, 10 units of electric charge move past point x every second What is the current in the circuit ______.
In the circuit shown, which switches (L,M or N) must be closed to light up the bulb?
_____ has a thin metallic filament that melts and breaks the connection when the circuit is overheated.
State whether true or false. If false, correct the statement.
Ammeter is connected in parallel in any electric circuit.
When a circuit is open, _____ cannot pass through it.
The wiring in a house consists of ______ circuits.
What is the role of the earth wire in domestic circuits?
Explain about domestic electric circuits. (circuit diagram not required)
Assertion: In an open circuit, the current passes from one terminal of the electric cell to another.
Reason: Generally, the metal disc of a cell acts as a positive terminal.
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.
Our body is a ______ of electricity.
The ______ is a species of fish that can give electric shocks of up to six hundred fifty watts of electricity.
Match the following
| 1. | Insulator | a. | Coulomb |
| 2. | Conductor | b. | Electric circuit |
| 3. | Closed path | c. | Copper |
| 4. | Electric charge | d. | Rubber |
Will the bulb glow in the circuit shown in the following figure? Explain.
An electric motor rated 1100 W is connected to 220 V mains. Find:
- The current drawn from the mains,
- Electric energy consumed if the motor is used for 5 hours daily for 6 days.
- Total cost of energy consumed if the rate of one unit is 5.
Assertion: People struck by lightning receive a severe electrical shock.
Reason: Lightning carries very high voltage.
