To obtain a p-type germanium semi-conductor, it must be doped with

1  arsenic
2.  antimony
3.  indium
4.  phosphorous

Subtopic:  Types of Semiconductors |
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Sound waves do not show the phenomenon of:

1.  interference
2.  diffraction
3.  refraction
4.  polarisation

Subtopic:  Polarization of Light |
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The magnifying power of a compound microscope is high if
 

1.  both the objective and the eyepiece has short focal lengths
2.  both the objective and the eyepiece have long focal lengths
3.  the objective has a short focal length and the eyepiece has a long focal length
4.  the objective has a long focal length and the eyepiece has a short focal length

Subtopic:  Simple & Compound Microscope |
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Subtopic:  Radioactivity |
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To double the covering range of a TV transmitter tower, its height should be made
 
1.  2 times

 

Subtopic:  Introduction |
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An alternating voltage V = Vsin ωt is applied across a circuit. As result I = Io sin ωt - π2 flows in it. The power consumed per cycle is
 
1.  zero

 

Subtopic:  RMS & Average Values |
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A slab consist of two portions of different materials of same thickness and having the conductivitiesK1 and K2. The equivalent thermal conductivity of the slab is
 
1.  K1K2

 

Subtopic:  Conduction |
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A prism is made up of material of refractive index . The angle of prism is A. If the angle of minimum deviation is equal to the angle of the prism, then the value of A is
 
1.  30°

 

Subtopic:  Prisms |
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The following table 
 
is a truth table for
 

 

Subtopic:  Logic gates |
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The half-life of a radioactive substance is 10 days. This means that

1.  The substance completely disintegrates in 20 days
2.  The substance completely disintegrates in 40 days
3.  1/8 part of the mass of the substance will be left intact at the end of 40 days
4.  7/8 part of the mass of the substance disintegrates in 30 days

Subtopic:  Radioactivity |
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