Which of the following has the highest value of refractive index ?
(A) Brine (sea water)
(B) Diamond
(C) Distilled water
(D) Glass
The phenomenon occurring during explosion of a hydrogen bomb is___________________?
(A) Nuclear fission
(B) Nuclear fusion
(C) A combination of both nuclear fission & fusion
(D) None of these
Energy of the sun arises mainly from __________________ reactions?
(A) Fusion
(B) Fission
(C) Combustion
(D) None of these
Absolute zero pressure can be attained at a temperature of___________________?
(A) 0°C
(B) 50°K
(C) 0°R
(D) None of these
Corrosion of metals cannot be prevented by its__________________?
(A) Tempering
(B) Chromising
(C) Aluminising
(D) Alloying
Other parameters remaining same, the recrystallisation temperature of an alloy is lowered, when_________________?
(A) Strain rate is increased
(B) Grain size is increased
(C) Prior cold deformation is increased
(D) Not affected by any of the above parameters
Which of the following rays has the least wavelength ?
(A) Ultraviolet rays
(B) Infrared rays
(C) Cosmic rays
(D) X-rays
Which of the following is not a principal alloying element for the structural steel ?
(A) Molybdenum
(B) Nickel
(C) Manganese
(D) Chromium
The following type of bonding is strongly directional in solids ?
(A) Vander Waal’s
(B) Ionic
(C) Metallic
(D) Covalent