• General Knowledge Practice Science & Technology Study Material

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The intrinsic semiconductor becomes an insulator at

a) 0 degree celcuis
b) 100 degree celcuis
c) 0 K
d) 300 k

If a wire is stretched to make its 0.1% longer ,its resistance will

a) Decrease by 0.2 %
b) Decrease by 0.05%
c) Increase by 0.05%
d) Increase by 0.2%

Hole is a:-

a) An antiparticle of electorn.
b) An artifically created particle.
c) Absence of free electrons.
d) A vacancy created when an electron leaves a covalent bond.

In the communication systems,AM is used for broadcasting because

a) Its is use avoids receiver complexity.
b) Its is more noise immune than other modulation system.
c) Its requie less transmitting power.
d) Do other modulation system can give the necessary bandwidth for faithful transmission.

A speech signal of 3 KHz is used to modulate a carrier signal of frequency 1 MHz, using amplitude modulation.The frequency of the side bands will be

a) 1.003 Mhz and 0.997 Mhz
b) 1003 Khz and 1000KHz
c) 3001 KHz and 2997 KHz
d) 1 MHz and 0.997 MHz

a) 10%
b) 20%
c) 25%
d) 50%

Heavy stable nuclei have more neutrons than protons.This is because of the

a) Neutorns are heavier than protons .
b) Electrostatic force between protons are repulsive.
c) Neturons decay into protons through beta decay.
d) Nuclear forces between neturons are weaker than that between protons.

a) 0 eV
b) (-27.2) eV
c) (-6.8) eV
d) None of these

If an electron and a photon propagate in the form of waves having the same wavelength,it implies that they have the same

a) Energy
b) Momentum
c) Angular momentum
d) Velocity