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- Question
Which part of the flame is the hottest?
Options- A. Blue Zone
- B. Luminous Zone
- C. Dark Zone
- D. Non - Luminous Zone
- Correct Answer
- Blue Zone
ExplanationBlue Zone is the hottest part of the flame that is where the flame has the most Oxygen and you are getting complete combustion. It is about 1400 degrees Centigrades. The Reddish part (Non - Luminous Zone) is the coolest part, about 800 deg C.
- 1. The ability to do work is called Energy.
Options- A. TRUE
- B. FALSE Discuss
- 2. A bimetal made copper and iron strips welded together is straight at room temperature. It is held vertically with iron strip towards left and copper strip towards right. If this bimetal is heated , it will
Options- A. remain straight
- B. bend towards right
- C. bend towards left
- D. none of these Discuss
- 3. An integrated circuit is more advantages than a coventional circuit because
Options- A. they make the electric equipments more reliable and easier for servicing
- B. a faulty part of a conventional circuit may be difficult to locate and repair
- C. if a part of the integrated circuit fails the entire circuit is simply replaced
- D. all the above Discuss
- 4. A series of fast moving still pictures can be made to appear as a moving picture because the eye
Options- A. can focus very rapidly as pictures change
- B. is quicker than the brain
- C. can see 2 images separated only if the interval betwen seeing them is more than one-tenth of a second
- D. can shut out some of the light Discuss
- 5. Radio waves sent out by a radio stations are reflected by
Options- A. troposphere
- B. stratosphere
- C. mesosphere
- D. ionosphere Discuss
- 6. Compressions and Rarefactions are characteristic of
Options- A. Longitudinal waves
- B. Transverse waves
- C. Both A & B
- D. Neither of A & B Discuss
- 7. Which compound is a nonelectrolyte?
Options- A. C2H6O
- B. HCl
- C. Na2CO3
- D. NaCl Discuss
- 8. Mirage is due to
Options- A. Magnetic disturbances in the atmosphere
- B. Equal heating of different parts of the atmosphere
- C. Unequal heating of different parts of the atmosphere
- D. Depletion of ozone layer in the atmosphere Discuss
- 9. What measures Air pressure?
Options- A. Barkometer
- B. Bolometer
- C. Spectrometer
- D. Barometer Discuss
- 10. Wind and solar energy are examples of
Options- A. Non renewable
- B. Renewable
- C. Unsustainable
- D. Limited Discuss
Physics problems
Search Results
Correct Answer: TRUE
Explanation:
Yes, the ability to do work is called Energy is True.
Correct Answer: bend towards left
Correct Answer: all the above
Explanation:
Integrated circuit (IC) is a tiny device that controls electric signals in such electronic equipments as computers and T.V sets. Many integrated circuits contain thousands of electronic parts on a paper - thin chip of silicon. These parts include capacitors, diodes, all in a very small, compact space.
Correct Answer: can see 2 images separated only if the interval betwen seeing them is more than one-tenth of a second
Explanation:
The eye can see images separately only if they are exhibited at an interval of more than 1/10 of a second. In the case of a movie, the still pictures come one after the other at less than this minimum interval. So we do not see them separately but only as a continuous moving picture.
Correct Answer: ionosphere
Explanation:
This is a layer of atmosphere about 60 to 70 km above the earth and extends to about 400km. It contains ionised particles which can reflect radio waves making radio communication round the world possible.
Correct Answer: Longitudinal waves
Explanation:
Compressions and Rarefactions are characteristic of Longitudinal waves.
The direction of vibration of the particles is in the same plane as in which the wave is propagating. The particles vibrate back and forth, about their mean positions.
Correct Answer: C2H6O
Explanation:
is a Non-electrolyte.
An electrolyte is a compound that conducts an electric current when it is in an aqueous solution or melted. In order to conduct a current, a substance must contain mobile ions that can move from one electrode to the other. All ionic compounds are electrolytes. When ionic compounds dissolve, they break apart into ions which are then able to conduct a current ( conductivity ). Even insoluble ionic compounds such as CaCO 3 are electrolytes because they can conduct a current in the molten (melted) state.
A nonelectrolyte is a compound that does not conduct an electric current in either aqueous solution or in the molten state. Many molecular compounds, such as sugar or ethanol, are nonelectrolytes. When these compounds dissolve in water, they do not produce ions.
Electrolytes are of 3 types ---- Strong Electrolytes, Weak Electrolytes and Non Electrolytes.
Strong Electrolytes ---- Compounds which completely dissolves. ( NaCl, Na2Co3, HCl )
Weak Electrolytes ----- Compounds which do not completely dissolves.
Non Electrolytes ------ Compounds which do not dissolves at all.
Correct Answer: Unequal heating of different parts of the atmosphere
Correct Answer: Barometer
Explanation:
Air Pressure can be defined as the pressure of air in the earth's atmosphere. It reaches a maximum of about 100,000 Pa near sea level and decreases as altitude increases.
The barometer is an instrument which is used for measuring Air pressure.
Physics instruments and their uses:
Barkometer - - - Tanning liquors used in tanning leather
Bolometer - - - Electromagnetic radiation
Spectrometer - - - Properties of light.
Correct Answer: Renewable
Explanation:
Many types of renewable energy resources such as wind and solar energy are constantly replenished and will never run out.
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