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Statement: Initially the term pseudo-sol...

Statement`:` Initially the term pseudo`-`solid was given for solids which were easily distorted by bending and compressing forces. They even tend to flow slowly under its own weight and lose shape.
Explanation `:` These, characteristics are shown by pseudo`-`solids as in pitch, glass and thus the name pseudo`-`solid was replaced by super `-` cooled liquids.

A

I is correct but II is wrong

B

I is wrong but II is correct

C

Both I and II are correct and II is correct explanation of I

D

Both I and II are correct but II is not correct explanation of I

Text Solution

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The correct Answer is:
D
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On fusion of a mixture of Na-2CO_3 and CaCO_3 with silica at 1500^@C , a liquid consisting of silicatees of sdium and calcium is formed. On cooling . Liquid become viscous and eventually ceasesto flow . It becomes solid and is known as flass. By varying the proportions of the three basic ingredients and by adding other substances, the properties of glass can be altered, Glass can be represented as R_2 O. MO.6SiO_2 , where R= Na or K, M = CaBa, Zn or pbSiO_2 may be replaced by Akl_2 O_3 , b_2 O_3 or P_2 O_5 . Colourd glasses are obtained by adding certain metallic oxdes or salts in the fused mass, Glass is attached by HF and this property is used to make marking on the galss , This is known as etching . The glass on rapid coolling becomes brittle and fragile . The artciles of glass are cooled neither slowly nor very rapidly . The process of graducal cooling of flass iscalled annealing . A special type of glass which contains cerium oxide and does not allow the passage of ultraviolet rays is called .

Knowledge Check

  • On fusion of a mixture of Na-2CO_3 and CaCO_3 with silica at 1500^@C , a liquid consisting of silicatees of sdium and calcium is formed. On cooling . Liquid become viscous and eventually ceasesto flow . It becomes solid and is known as flass. By varying the proportions of the three basic ingredients and by adding other substances, the properties of glass can be altered, Glass can be represented as R_2 O. MO.6SiO_2 , where R= Na or K, M = CaBa, Zn or pbSiO_2 may be replaced by Akl_2 O_3 , b_2 O_3 or P_2 O_5 . Colourd glasses are obtained by adding certain metallic oxdes or salts in the fused mass, Glass is attached by HF and this property is used to make marking on the galss , This is known as etching . The glass on rapid coolling becomes brittle and fragile . The artciles of glass are cooled neither slowly nor very rapidly . The process of graducal cooling of flass iscalled annealing . A special type of glass which contains cerium oxide and does not allow the passage of ultraviolet rays is called .

    A
    Flint flass
    B
    Crooke`s glass
    C
    Hard glass
    D
    Pyrex glass

  • Read the passage carefully and select the best answer to each question out of the given four alternatives. PASSAGE - III Religious architecture forms a major portion of India.s built heritage. These structures are not only unwritten documents of history, they are also stamps of the might of the rulers who built them and articulations of grand visions. Secular and religious structures are products of their location - the material used to build them depended on what was available to the kings and workers at that time. They were also a reflection of the piety of the artisans and workers, for nothing else can explain the hard work that went into cutting through solid natural rock to carve out temples and spectacular sculptures. Rock-cut architecture never fails to awe me with all its majesty, precision, and intricate detail. The earliest rock-cut architecture is from the Mauryan dynasty, but the Ajanta caves, which I had visited a few decades ago and which left me awestruck, are among the earliest rockcut temples. The Udayagiri caves, in Vidisha, Madhya Pradesh, are not as popular but they are worth a visit, for they contain some of the oldest Hindu temples and iconography. They were built during the Gupta period (350-550 CE). These caves were not just an expression of religious piety but also a political statement. They lie on two low sandstone hills between the rivers Betwa and Beas. It is possible that when these caves were carved out, they fell directly on the Tropic of Cancer and thus the name translates to Mount of Sunrise. On the day of summer solstice, the sun would have been directly overhead, making this a place of worship. Why the caves of Vidisha got its name as Udayagiri - MountofSunrise?

    A
    It is because the day of winter solstice, the sun is directly overhead to the caves.
    B
    It is because when the rock was carved out of these caves, it fell onto Tropic of Cancer.
    C
    It is because Gupta had deep reverence for Sun god.
    D
    None of these

  • Read the passage carefully and select the best answer to each question out of the given four alternatives. Religious architecture forms a major portion of India’s built heritage. These structures are not only unwritten documents of history, they are also stamps of the might of the rulers who built them and articulations of grand visions. Secular and religious structures are products of their location – the material used to build them depended on what was available to the kings and workers at that time. They were also a reflection of the piety of the artisans and workers, for nothing else can explain the hard work that went into cutting through solid natural rock to carve out temples and spectacular sculptures. Rock-cut architecture never fails to awe me with all its majesty, precision, and intricate detail. The earliest rock-cut architecture is from the Mauryan dynasty, but the Ajanta caves, which I had visited a few decades ago and which left me awestruck, are among the earliest rock-cut temples. The Udayagiri caves, in Vidisha, Madhya Pradesh, are not as popular but they are worth a visit, for they contain some of the oldest Hindu temples and iconography. They were built during the Gupta period (350-550 CE). These caves were not just an expression of religious piety but also a political statement. They lie on two low sandstone hills between the rivers Betwa and Beas. It is possible that when these caves were carved out, they fell directly on the Tropic of Cancer and thus the name translates to Mount of Sunrise. On the day of summer solstice, the sun would have been directly overhead, making this a place of worship. Why the caves of Vidisha got its name as Udayagiri - Mount of Sunrise?

    A
    It is because the day of winter solstice, the sun is directly overhead to the caves.
    B
    It is because when the rock was carved out of these caves, it fell onto Tropic of Cancer.
    C
    It is because Gupta had deep reverence for Sun god.
    D
    None of these