Description : Explain the damages which are caused by expansion or contraction by giving two examples.
Last Answer : I. In hot summer, the concrete used in roads expands. If no space is provided for its expansion, then road surface crack. II. Two sections of railway track are laid with gaps. If there are no gaps, then they may be de-shaped due to expansion in summer.
Description : Describe the effects of expansion and contraction of solids.
Last Answer : I. In hot summer, concrete in roads expands and road surface crack. II. Two sections of railway track are laid with gaps. If there are no gaps, then they may be de-shaped due to expansion ... gap is also present at this end. So that it can move forward and backward during expansion and contraction.
Description : Explain the expansion of liquids and with the help of an experiment.
Last Answer : I. Take an empty flask and fit a cork into its mouth. Pass short limb of U-shape glass tube through it. II. Clamp the flask in a stand. III. Dip the long limb of U-shaped tube in the water ... . On cooling, air in the flask contracts, so suction is created which pulls the water in the glass tube up.
Description : What is thermal expansion? Explain it with the help of experiment.
Last Answer : The expansion of material objects on heating is called thermal expansion. I. Take a metallic sphere which can pass easily through a ring. II. Remove the sphere out of the ring. III. Now heat the ... expansion due to heating. V. On cooling the sphere, it attracts and passes through the ring again.
Description : Describe a simple experiment to study the thermal expansion of Gases.
Last Answer : I. Take an empty flask and fit a cork into the mouth of the flask. II. Limb of the U shaped glass tube through the cork. III. Clamp the flask in a stand as shown in fig. IV. Dip the ... and produce bubbles in water. X. On cooling flask contracts and water level is pulled up in the glass tube.
Description : When a vessel containing a liquid is heated, the level of liquid initially falls and then rises up. Why does it happen so? OR Describe the irregular expansion of liquid.
Last Answer : On heating the liquid water from 0 degree C to 4 degree C, it contracts so the level of liquid initially falls. But after 4 degree C it expands so liquid rises up.
Description : Why is water not used instead of mercury in thermometers?
Last Answer : Because Mercury has high coefficient of expansion per unit rise in temperature
Description : What is thermometer? How it works?
Last Answer : A thermometer is a device used to measure the temperature. When some hot object touch the bulb of the thermometer, the liquid inside the narrow tube expands and rises up and we can measure the temperature by reading scale.
Description : Demonstrate how a bimetallic strip works in a thermostat.
Last Answer : In electric iron, when current passes through heating element, it becomes hot. The connected bimetallic strip also heats up. On getting hot, it bends and is disconnected from heating element so, circuit breaks and switches off the electric iron.
Description : What is Rivet and Riveting?
Last Answer : A rivet is a small, cylindrical and smooth shaft whose one end is swollen (called Head) while the other end is flat. Hot rivets are used to join the metal plates. The process in which two metal plates are joined together by means of rivets is called riveting.
Description : Why do gases expand faster than liquids and solids?
Last Answer : Because the particles of gases are widely disturbed i.e. their particles are far apart from each other and they free to move. Other
Description : Why do hot air balloons rise up?
Last Answer : Since hot gases rose up in air, so hot air in balloon causes it to rise up.
Description : Why gaps are left between two sections of a railway track?
Last Answer : The gaps allow the expansion and contraction of rails during summer and winter season.
Description : Why one end of the iron girders is placed on rollers in construction of bridges?
Last Answer : One end of iron girders is placed on the rollers along with a gap at this end so that girder can move forward and backward during expansion or contraction.
Description : Write down the effects of heating and cooling on gases
Last Answer : Gas expand on heating and contract on cooling
Description : Write down the effects of heating and cooling on solids
Last Answer : Solid expand on heating and contract on cooling
Description : A partial denture that seats on the master cast but fails to seat correctly in the mouth is a result of, A. Contraction of the metal framework during casting B. Insufficient expansion of the investment material C. Distortion of impression D. Failure to block out unwanted undercuts
Last Answer : C. Distortion of impression
Description : A solid metallic block weighing 5 kg has an initial temperature of 500°C. 40 kg of water initially at 25°C is contained in a perfectly insulated tank. The metallic block is brought into contact with water. Both of them come to equilibrium. ... .kg-1, K-1is (A) -1.87 (B) 0 (C) 1.26 (D) 3.91
Last Answer : (B) 0
Description : When dry cast is immersed in water saturated with calcium sulphate:** A. There is contraction B. There is negligible expansion C. There is definite expansion D. There is no change E. None of the above
Last Answer : B. There is negligible expansion
Description : Could someone help me understand the this strange behavior (inside for details)
Last Answer : Depending on your age, puberty & hormones are big factors in the answer to “why” in the sudden change.
Description : What is the breaking of rocks due constant expansion and contraction called?
Last Answer : Exfoliation.
Description : What type of weathering is thermal heat expansion and contraction?
Last Answer : Feel Free to Answer
Description : Devaluation of currency leads to - (1) expansion of export trade (2) contraction of import trade (3) expansion of import substitution (4) All of the above
Last Answer : (4) All of the above Explanation: Devaluation in modern monetary policy is a reduction in the value of a currency with respect to those goods, services or other monetary units with which ... deficit. Import substitution means promotion of export to replace imports. It is also fallout of devaluation.
Description : In a railway track, two rails are joined end to end with a gap in between them because – (1) steel can be saved (2) accidents due to contraction in winter can be avoided (3) air-gaps are necessary for bearing the weight of running train (4) accidents due to expansion in summer can be avoided.
Last Answer : (4) accidents due to expansion in summer can be avoided. Explanation: The volume of materials changes depending on current temperature. Usually heat makes them expand, and cold leads them to contract. ... on the tracks. The same applies in many other fields of engineering, i.e. bridge building.
Description : Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the (A) Packing may be crushed due to thermal expansion/contraction of the ... C) Viscosity variation of the fluids may cause channelling/flooding (D) None of these
Last Answer : (A) Packing may be crushed due to thermal expansion/contraction of the components of the equipments
Description : In a railway track, two rails are joined end to end with a gap tin between them because? A. Steel can be saved B. Accidents due to contraction in winter can be avoided C. Air gaps are necessary ... of running train D. Accidents due to expansion in summer can be avoided (Answer) E. All of these
Last Answer : D. Accidents due to expansion in summer can be avoided (Answer)
Description : A coal with high ash content is undesirable, as (A) It is abrasive to the coal pulveriser (i.e. ball mill) and the combustion chamber (B) The ash in molten condition gets absorbed in the pores of the ... and stick to the boiler tubes thereby reducing the heat transfer (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : Major loss in sudden contraction in pipe flow is due to (A) Boundary friction (B) Flow contraction (C) Expansion of flow after sudden contraction (D) None of these
Last Answer : (B) Flow contraction
Description : Disc compensators are provided in large diameter fuel gas carrying pipelines to (A) Keep the pipe in proper orientation (B) Make the pipe joint leak-proof (C) Account for contraction/expansion ... due to temperature changes of the surroundings (D) Account for the pressure variation side the pipeline
Last Answer : (C) Account for contraction/expansion of pipe due to temperature changes of the surroundings
Description : To prevent compressive stresses in a rigid concrete pavement, the joint provided, is (A) Expansion joint (B) Contraction joint (C) Hinged joint (D) All the above
Last Answer : Answer: Option D
Description : Tie bars in cement concrete pavements are at (A) Expansion joints (B) Contraction joints (C) Warping joints (D) Longitudinal joints
Description : The surface where two successive placements of concrete meet, is known as (A) Contraction joint (B) Expansion joint (C) Construction joint (D) Both (a) and (b)
Last Answer : Answer: Option C
Description : A stress which develops within an object when it attempts to expand or contract in response to a temperature changes, but cannot, due to being held rigidly in place. a. elongation b. thermal stress c. expansion contraction d. thermal expansion
Last Answer : thermal stress
Description : Why would you invest the wax pattern as soon as possible in an indirect inlay fabrication: A. Minimise distortion B. Avoid contraction C. Avoid expansion
Last Answer : A. Minimise distortion
Description : A period of expansion and contraction measured by real GDP is called (a) Business cycle (b) Expansion © Recession (d) Contraction
Last Answer : (a) Business cycle
Description : Which of the following phases describes the phase of business cycle that occurs after a trough and before a peak (a) Lag (b) Consolidation © Expansion (d) Contraction
Last Answer : © Expansion
Description : 45 The function of conservator in a transformer is A. To protect against internal fault B. To reduce copper as well as core losses C. To cool the transformer oil D. To take care of the expansion and contraction of transformer oil due to variation of temperature of surroundings
Last Answer : D. To take care of the expansion and contraction of transformer oil due to variation of temperature of surroundings
Description : In a railway track, two rails are joined end to end with a gap in between thembecause (1) steel can be saved (2) accidents due to contraction in winter can be avoided (3) air-gaps are necessary for bearing the weight of running train (4) accidents due to expansion in summer can be avoided.
Last Answer : accidents due to expansion in summer can be avoided.
Description : Devaluation of currency leads to (1) expansion of export trade (2) contraction of import trade (3) expansion of import substitution (4) All of the above
Last Answer : All of the above
Description : Define Seasonal Unemployment. Why is educated unemployment a peculiar problem in India? Explain -Economics 9th
Last Answer : Seasonal unemployment is a type of unemployment in which the employment offered to an individual is seasonal. One cannot get a job round the year . Educated unemployment is one of the peculiar problems in India as today more and more youth choose the same stream and most of them have a common goal.
Description : Which of the weathering agents is almost peculiar to the Indian Himalayas? (a) Wind (b) Glaciers (c) Snowfall (d) Running water
Last Answer : Ans: (b)
Description : Isn’t it peculiar what can run through your head just as you’re falling asleep?
Last Answer : [mod says] Moved to Social. Yes, the weirdest thoughts come up. I don’t really get scary thoughts at night, but I do regularly startle myself with silly organizational stuff. Then I feel the urge to respond to emails or buy new sheets at 3 am. Somehow, that’s vitally important right then.
Description : Does anyone else think it peculiar that the delegates in Cleveland are so adept at showing no signs of any sense of humor?
Last Answer : It’s hard for anyone to have a sense of humor while staring up the barrel of a gun.
Description : What's an eating habit that you find reasonable but others find peculiar?
Last Answer : Most of my foods can’t touch each other. Dry foods can touch, but wet foods can’t.
Description : Isn't it peculiar that in the Middle East Israel and Iran aren't natural allies?
Last Answer : Mortar attacking and bombing each other every day isn’t very enlightened.
Description : Do you have any habits most people find peculiar?
Last Answer : I much prefer looking at the night sky to watching television. I’m very out of touch with pop culture as a result of that; and I’m sure most find it very odd.
Description : Do you have any peculiar ocular stuff going on?
Last Answer : Unfortunately, yes. I often get what is called migraine with aura. I have moments that feel like my eyes are going cross eyed (this is the best way I can think of to explain it). It's not ... see zigzag patterns, blind spots and what looks like flashing lights when this happens. It's not fun. :/
Description : Do you have any food combos that would be considered peculiar?
Last Answer : My favourite slightly unusual food combo (though not unheard of by any means) is black pepper with my strawberries instead of sugar. It’s lovely! (Similar effect to chilli-chocolate….)
Description : Why is my Firefox acting peculiar?
Last Answer : Have you tried restarting your OS and/or installing the latest Firefox?
Description : Do you think it takes a certain intellectual level for an animal to consider a technological species such as Humans, as gods instead of just another animal with peculiar abilities?
Last Answer : King Louie from Jungle book wanted to be a man cub so maybe they think of us as the superior being , the all mighty power could i be wrong / Jungle book was real so don’t say it wasn’t if its on tv its real . lol