The                is a mixture of cement and sand, the usual proportion being 1:3.

Related MCQs

• A water-heater is covered with insulation boards over a total surface area of 3 m2. The inside board surface is at 75°C and the outside being at 20°C and the conductivity of material being 0.08 W/m K. Find the thickness of board to limit the heat transfer loss to 200 W ?
• 540g of ice at 0°C is mixed with 540g of water at 80°C. What is the final temperature of the mixture?
• What the number that measures an object’s resistance to being deformed elastically when stress is applied to it?
• A composite wall is made of two layers of thickness δ1 and δ2 having thermal conductivities k and 2k and equal surface area normal to the direction of heat flow. The outer surface of composite wall are at 100 degree Celsius and 200 degree Celsius. The minimum surface temperature at the junction is 150 degree Celsius. What will be the ratio of wall thickness?
• A GaAs injection laser has a threshold current density of 2.5*103Acm-2 and length and width of the cavity is 240μm and 110μm respectively. Find the threshold current for the device.
• The fundamental frequency of a sonometer wire is n. If the tension is made 3 times and length and diameter are also increased 3 times, the new frequency will be
• If unloaded Q due to conductor loss and unloaded Q due to dielectric loss is 29390 and 2500 respectively, then the total unloaded Q of the circular cavity is:
• The                              system is best developed and is used for fabricating both lasers and LEDs for the shorter wavelength region.
• Calculate the numerical aperture of an optical fibre whose core and cladding are made of materials of refractive index 1.6 and
• The expansion and contraction joints generally consist of some elastic material, known as                  which should be compressible, rigid, cellular and Resilient.