Related Mcqs:

1. The ratio of mass of a neutron to that of an electron is about 1839. What is the ratio of the mass of a proton to that of an electron ?

   A. 159
   B. 1837
   C. 2537
   D. 10000

2. Two wires of the same radius & material having length in the ratio of 1 : 2 are stretched by the same force. The strain produced in the two wires will be in the ratio of__________________?

   A. 1 : 1
   B. 1 : 2
   C. 2 : 1
   D. 1 : 4

3. 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

4. Tip of the match stick contains a mixture of________________?

   A. K + S
   B. K + S + K2Cr2O7
   C. S + K2Cr2O7 + White P
   D. None of these

5. Out of the following, maximum temperature drop for a given heat flow & for the same thickness will be in the case of________________?

   A. Steel
   B. Glass wood
   C. Copper
   D. Fireclay bricks

6. _______________ has a negative co-efficient of linear expansion?

   A. Iron
   B. Copper
   C. Rubber
   D. Nickel

7. Diffusion co-efficient of a metal in a solid solution depends upon its ?

   A. Composition
   B. Temperature
   C. Both A. & B.
   D. Neither A. nor B.

8. The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 × 10-16 m2S-1 and it is 1.94 × 10-14 m2S- 1 at 1200 K. The activation energy (in k. J.mole-1) for the diffusion of Ni in Cu is_________________?

   A. 130
   B. 180
   C. 230
   D. 250

9. 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

10. For efficient performance of a blast furnace, the extent of reduction of Wustite (FeO) should be___________________?

    A. 100% indirect reduction
    B. 100% direct reduction
    C. 50-60% indirect reduction
    D. 30-40% indirect reduction