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Multiple choice physics simple electric circuits bulbs bulb bulb connected to an electric cell

Fill in the blanks:

Pure tungsten has _________.

  1. low resistivity and a high melting point.

  2. high resistivity and a high melting point.

  3. high resistivity and a low melting point.

  4. low resistivity and a low melting point.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

tungsten has a high melting point and is able to withstand heat and corrosion. Tungsten is one of the most durable types of filaments used in light bulbs. It must be exposed to very high temperatures before melting, and only carbon arc has a higher heat resistance level than tungsten.

Multiple choice physics simple electric circuits bulbs bulb bulb connected to an electric cell

 An electric bulb converts electrical energy into 

  1. sound energy

  2. mechanical energy

  3. nuclear energy

  4. none of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Electric bulb uses the  heating effect of current.when current is passed, electric bulbs has a tungsten filament which gets heated with the flow of current and brighten up, the filament having a high value of resistance heated up , more the heat more will be the light.

Multiple choice physics simple electric circuits bulbs bulb bulb connected to an electric cell

A building has $10$ bulbs of $40W$, $5$ bulbs of $100W$, $5$ fans of SOW and one heater of $1$ kilowatt.Every day bulbs are using for $5$ hours, fans are using for $8$ hours and heater is using for $1$ hour. The electric mains voltage is $220 V$. Calculate:

  1. Maximum power of the electric circuit in the building

  2. The minimum capacity of main fuse in the building and

  3. The cost of consumed electric energy the rate of Rs $5$ per unit in a week

  4. Maximum power of the electric circuit in the building.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Daily energy: 10×40×5/1000 = 2 kWh (bulbs), 5×100×8/1000 = 4 kWh (fans), 1×1×1 = 1 kWh (heater). Total daily = 7 kWh. Weekly = 49 kWh. Cost at Rs 5/unit = Rs 245. Option C asks for the cost of consumed energy.

Multiple choice physics simple electric circuits bulbs bulb bulb connected to an electric cell

When the current passes through the filament, it gets heated to incandescence and give light while the connecting wires are not heated because

  1. The connecting wires are good conductor of heat while the filament is bad conductor.

  2. The connecting wires are of low resistance while the filament is of high risistance.

  3. The density of connecting wires is less than that of the filament.

  4. The connecting wires are bad conductor of heat while the filament is good conductor.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
An incandescent light bulb, incandescent lamp or incandescent light globe is an electric light with a wire filament heated to a high temperature, by passing an electric current through it, until it glows with visible light (incandescence).The hot filament is protected from oxidation with a glass or quartz bulb that is filled with inert gas or evacuated. In a halogen lamp, filament evaporation is prevented by a chemical process that redeposits metal vapor onto the filament, extending its life.
The resistance of wires used inside bulb is very high so on passing current it glows.
Multiple choice physics simple electric circuits bulbs bulb bulb connected to an electric cell

The bulbs which emit a bluish light, are

  1. filled with argon

  2. filled with nitrogen

  3. vacuum bulbs

  4. coated from inside with a light blue colour
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Because atoms and molecules can exist only in certain specific energy states, the energy emitted by the excited molecule is limited to differences between these states. Only certain energies of light are emitted. The colour of the glow is determined by the energy of the emitted light. and for argon its bluish