_____________ glass is used in the mercury in glass thermometer meant for measuring a temperature of 500°C ?

Related Mcqs:

1. A thin, flat & square plate measuring 2 m × 2 m is freely hanging in ambient air at 25°C. It is exposed to the solar radiation falling on one side of the plate at the rate of 500 W/m2. The plate temperature will remain constant at 30°C, if the convective heat transfer co-efficient is ________________ W/m2 °C ?

   A. 50
   B. 100
   C. 150
   D. 200

2. The boiling & freezing points on a newly defined temperature scale in degree ‘D’ are 400°D & 100°D respectively. The temperature reading corresponding to 60°C on this new temperature scale will be equal to _____________ °D ?

   A. 140
   B. 180
   C. 240
   D. 280

3. Heating the Hypo-eutectoid steels to 30°C above the upper critical temperature line, soaking at that temperature and then cooling slowly to the room temperature to form a pearlite & ferrite structure is called_______________________?

   A. Tempering
   B. Hardening
   C. Annealing
   D. Normalising

4. The ratio of thermal & electrical conductivity is same for all the metals at the same temperature; and at around room temperature, this ratio is proportional to(where, T = absolute temperature, °K) ?

   A. T
   B. 1/T
   C. T2
   D. 1/T2

5. The following thermocouple may be used for measuring temperature upto 1873°K__________________?

   A. Chromel-alumel
   B. Copper-constantan
   C. Platinum-platinum rhodium
   D. Iron-constantan

6. While the oxy-acetylene flame produces a temperature of 3200°C, the temperature produced by oxy-hydrogen flame is about _____________ °C ?

   A. 1800
   B. 2000
   C. 2400
   D. 3000

7. Fibre glass is a composite material of_________________?

   A. Glass fibre in a polymer matrix
   B. Glass fibre in a metallic matrix
   C. Polymer fibre in a glassy matrix
   D. Both ‘b’ & ‘c’

8. Glass reacts with___________________?

   A. H2SO3
   B. HF
   C. HNO3
   D. K2Cr2O7

9. Spherical shape of mercury droplets is due to its____________________?

   A. High viscosity
   B. Low surface tension
   C. High density
   D. High surface tension

10. The value of y = cp/cv. at < 500°C for air & most common gases can be safely assumed to be_____________________?

    A. 0.8
    B. 1
    C. 1.4
    D. 1.8