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General Knowledge Practice Science & Technology Study Material

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Astronomy

The intrinsic semiconductor becomes an insulator at

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

✔Answer

Correct Answer Is : 0 K

Solution Is :

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%

✔Answer

Correct Answer Is : Increase by 0.2%

Solution Is :

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.

✔Answer

Correct Answer Is : A vacancy created when an electron leaves a covalent bond.

Solution Is :

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.

✔Answer

Correct Answer Is : Its is use avoids receiver complexity.

Solution Is :

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

✔Answer

Correct Answer Is : 1.003 Mhz and 0.997 Mhz

Solution Is :

The maximum peak to peak voltage of an AM wave is 24 mV and the minimum peak to peak voltage is 8mV.The modulation index is.

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

✔Answer

Correct Answer Is : 50%

Solution Is :

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.

✔Answer

Correct Answer Is : Electrostatic force between protons are repulsive.

Solution Is :

The ground state energy of hyrogen atom is -13.6eV.What is the potential energy of the electorn in this state?

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

✔Answer

Correct Answer Is : (-27.2) eV

Solution Is :

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

✔Answer

Correct Answer Is : Momentum

Solution Is :

When a compact disc is illusminated by a source of white light,coloured lanes are observed.This due to

a) Dispersion
b) Diffraction
c) Interference
d) Refraction

✔Answer

Correct Answer Is : Diffraction

Solution Is :

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General Knowledge Practice Science & Technology Study Material

Astronomy

The intrinsic semiconductor becomes an insulator at

Correct Answer Is : 0 K

Solution Is :

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

Correct Answer Is : Increase by 0.2%

Solution Is :

Hole is a:-

Correct Answer Is : A vacancy created when an electron leaves a covalent bond.

Solution Is :

In the communication systems,AM is used for broadcasting because

Correct Answer Is : Its is use avoids receiver complexity.

Solution Is :

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

Correct Answer Is : 1.003 Mhz and 0.997 Mhz

Solution Is :

The maximum peak to peak voltage of an AM wave is 24 mV and the minimum peak to peak voltage is 8mV.The modulation index is.

Correct Answer Is : 50%

Solution Is :

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

Correct Answer Is : Electrostatic force between protons are repulsive.

Solution Is :

The ground state energy of hyrogen atom is -13.6eV.What is the potential energy of the electorn in this state?

Correct Answer Is : (-27.2) eV

Solution Is :

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

Correct Answer Is : Momentum

Solution Is :

When a compact disc is illusminated by a source of white light,coloured lanes are observed.This due to

Correct Answer Is : Diffraction

Solution Is :

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