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Engineering :: Engineering Materials

301.  When a Ge-crystal is doped with phosphorous atom, it becomes
A. P-type semi-conductor B. N-type semi-conductor
C. Photo sensitive D. An insulator
E. A ferite    
302.  Cadmium sulphide cell is a
A. Photo conductive cell B. Solar cell
C. Photovoltaic cell D. Thermocouple
E. Photo emissive cell    
303.  Which of the following is incorrect for diamond?
A. An allotrope of graphite B. Insoluble in all solvents
C. White in colour D. Densest form of carbon
E. Transparent    
304.  Which of the following can have positive or negative charge?
A. Electron B. Iron
C. Hole D. Neutron
E. Isotope    
305.  Which of the following colour of light has the least wavelength?
A. Red B. Violet
C. Green D. Orange
E. Blue    
306.  An atom containing an odd number of electrons is said to be
A. Diamagnetic B. Hypermagnetic
C. Paramgnetic D. Ferromagnetic
E. Dielectric    
307.  A solution of NaOH conducts electricity bcause NaOH is
A. A dielectric B. A non-electrolyte
C. A strong electrolyte D. A week electrolyte
E. None of the above    
308.  Heavy water is obtained by
A. Rapid evaporation of water B. Slow evaporation of water
C. Repeared purification D. Low temperature, low pressure distillation
E. Prolonged electrolysis of water    
309.  Identify the correct relation
A. Mass number - Atomic number = Number of neutrons B. Mass number - Atomic number = Number of protons
C. Number of neutrons - Number of protons = Mass number D. Number of electrons outside the nucleus - Number of proton = Mass number
E. None of the above    
310.  Laser is a device to produce
A. Beam of white light B. Beam of monochromatic light
C. Coherent light D. Microwaves
E. X-rays    

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