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- Question
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
- Correct Answer
- bend towards left
- 1. 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
- 2. 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
- 3. Radio waves sent out by a radio stations are reflected by
Options- A. troposphere
- B. stratosphere
- C. mesosphere
- D. ionosphere Discuss
- 4. Tap water is placed in an open pad and allowed to evaporate. After some time the temperature of water
Options- A. increases to a great extent
- B. increases slightly
- C. decreases slightly
- D. decreases rapidly Discuss
- 5. The cover of a solar coker is made of glass because
Options- A. it absorbs sun's rays
- B. it reflects sun's rays
- C. it retains the heat inside by the green house effect
- D. it rediates heat better than metals Discuss
- 6. The ability to do work is called Energy.
Options- A. TRUE
- B. FALSE Discuss
- 7. Which part of the flame is the hottest?
Options- A. Blue Zone
- B. Luminous Zone
- C. Dark Zone
- D. Non - Luminous Zone Discuss
- 8. Compressions and Rarefactions are characteristic of
Options- A. Longitudinal waves
- B. Transverse waves
- C. Both A & B
- D. Neither of A & B Discuss
- 9. Which compound is a nonelectrolyte?
Options- A. C2H6O
- B. HCl
- C. Na2CO3
- D. NaCl Discuss
- 10. 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
Physics problems
Search Results
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: decreases slightly
Explanation:
Evaporation causing cooling.Here the evaporation is less. Therefore cooling is less.
Correct Answer: it retains the heat inside by the green house effect
Explanation:
As the inside of the cooker is painted black, heat absorption is more producing heat waves of longer wavelength which cannot escape through glass and hence are trapped inside. Thus the food is cooked.
Correct Answer: TRUE
Explanation:
Yes, the ability to do work is called Energy is True.
Correct Answer: Blue Zone
Explanation:
Blue 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.
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
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