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Match the following classification of glasses with their specific uses: a. Soda lime glass 1. Used in the manufacturing of glass articles which have to withstand high temperatures. b. Potash lime glass 2. Used in the manufacturing of artificial gems, electric bulbs, lenses, Prisms, etc. c. Potash lead glass 3. Used in the manufacturing of glass tubes, laboratory apparatus, plate glass, window panels, etc. d. Common glass 4. Used in the manufacturing of medicine bottles
Consider the following statements.
1. Glass wool has tensile strength greater than steel.
2. Glass wool is fire proof.
3. Glass wool has high electrical conductivity and absorbs moisture.
4. Glass wool is used to prepare libre glass.
Which of the statements given above are correct?
In this question, a statement is given followed by four conclusions. Choose the conclusion(s) which best fit(s) logically. Statement: To pass the examination, one must work hard. Conclusions: I. Examination is related to only hard work. II. All those who do not work hard pass. III. Without hard work, one does not pass. IV. Hard-working person is a satisfied person.
The bypass factor (B. P. F.) in case of sensible heating of air is (Where td₁ = Dry bulb temperature of air entering the heating coil, td₂ = Dry bulb temperature of air leaving the heating coil, and td₃ = Dry bulb temperature of heating coil)
The bypass factor (B.P.F.) in case of sensible heating of air is (Where td1 = Dry bulb temperature of air entering the heating coil, td2 = Dry bulb temperature of air leaving the heating coil and td3 = Dry bulb temperature of heating coil)
In an experiment, glass is broken by the high pitch sound producing instruments. Statement: The same experiment is conducted in the moon and the glass is broken. Reason: The frequency of sound waves is matched with the natural frequency of the glass. So the glass is broken.
A cuboid of length 56 cm ,breadth 49 cm and height 11 cm. It is melted and convert into marble spherical glass. Find how many such conical marble glass can make by cuboid and also find how much money is needed if one spherical marble glass cost Rs. 25 and radius of conical marble glass is 7 cm.
With regard to glass, which of these statements are NOT correct? I. Soda-lime glass is used in the manufacture of artificial gems and lenses. II. Chromatic glass is used in ICU and meeting rooms. III. The appearance of potash-lime glass in colour is Green to colourless.
A crown glass prism with refractive index 6° is to be achromatized for red and blue color light with flint glass prism. What will be the angle of flint glass prism? (µr = 1.513, µr‘ = 1.645, µ2 = 1.523 and µ2‘ = 1.665, Where µr and µ2 are refractive indices of red and blue light respectively whereas, µr‘ and µ2‘ are refractive indices of red and blue light respectively for flint glass.)
A glass fibre reinforced epoxy composite is made with 60 wt.% unidirectional continuous glass fibres. The elastic moduli of the glass fibre and the epoxy matrix are 72.5 and 2.4 GPa, respectively. What is the elastic modulus of this composite along the fibre direction, in GPa? The densities of glass fibre and epoxy are 2.58 g/cm3 and 1.14 g/cm3, respectively