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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 the Gurudwara Bangla Saheeb, some people are employed to prepare food for Covid-19 patients. It is  observed that 3 males and 2 females altogether can prepare food in 15 hours while 2 males and 3 females can prepare food in 10 hours for the same. In how many hours 2 males and 5 females can prepare food for same .
Following are the statements regarding the planning of a field trip. What will be the correct arrangement? a) Prepare lesson to discuss the subject of the trip b) Prepare a trip schedule that includes arrival and departure times, bathroom stops, meals etc. c) Prepare a preliminary instructions guide for students d) Arrange a post- trip discussion
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.
Which of the following statements are true - I. Negative resists on exposure of light becomes more soluble. II. Positive resists on exposure of light becomes more soluble. III. Chrome glass is used as mask for pattern printing.
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.
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