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What do you mean by polar molecules and non-polar molecules? Give ‘one’ example each.
Concept: Atomic Masses and Composition of Nucleus
Calculate the de-Broglie wavelength of an electron moving with one-fifth of the speed of light.Neglect relativistic effects. (`h = 6.63 xx 10^(-34)` J.s, c= `3xx10^8`m/s, mass of electron = `9 xx 10^(-31) kg)`
Concept: de-Broglie Relation
An electron of energy 150 eV has wavelength of 10-10m. The wavelength of a 0.60 keV electron is?
Concept: de-Broglie Relation
Using an expression for energy of electron, obtain the Bohr’s formula for hydrogen spectral lines.
Concept: Hydrogen Spectrum
What is binding energy of a hydrogen atom?
Concept: Mass Defect and Binding Energy
Which logic gate corresponds to the truth table given below?
|
A |
B |
Y |
|
0 |
0 |
I |
|
0 |
1 |
0 |
|
1 |
0 |
0 |
|
1 |
1 |
0 |
Concept: Digital Electronics and Logic Gates
Explain the elementary idea of an oscillator with the help of block diagram
Concept: Oscillators
In a semiconductor, acceptor impurity is.................................
- antimony
- indium
- phosphorous
- arsenic
Concept: Properties of Solids: Electrical Properties >> Applications of n-type and p-type Semiconductors
What are α and β parameters for a transistor? Obtain a relation between them.
Concept: Transistor and Characteristics of a Transistor
The output of NOR gate is high, when _______.
Concept: Digital Electronics and Logic Gates
Explain the formation of energy band diagram in case of conductor and semiconductor.
Concept: Energy Bands in Solids
Colour of light emitted by LED depends upon__________________ .
- its forward bias
- its reverse bias
- the band gap of the material of semiconductor
- its size
Concept: Special Purpose P-n Junction Diodes
In case of transistor oscillator, to obtain sustained oscillations, the product of voltage gain without feedback and feedback factor should be __________.
Concept: Oscillators
Explain the working of P-N junction diode in forward and reverse biased mode.
Concept: Semiconductor Diode
When a hole is produced in P-type semiconductor, there is _______.
Concept: Properties of Solids: Electrical Properties >> Applications of n-type and p-type Semiconductors
When a p-n-p transistor is operated in saturation region, then its ______.
(A) base-emitter junction is forward biased and base-collector junction is reverse biased.
(B) both base-emitter and base-collector junctions are reverse biased.
(C) both base-emitter and base-collector junctions are forward biased.
(D) base-emitter junction is reverse biased and base-collector junction is forward biased
Concept: Transistor and Characteristics of a Transistor
If the charge on the condenser of 10°F is doubled, then the energy stored in it becomes __________
Concept: Energy Bands in Solids
The logic gate which produces LOW output when one of the input is HIGH and produces
HIGH output only when all of its inputs are LOW is called _______.
(A) AND gate
(B) OR gate
(C) NOR gate
(D) NAND gate
Concept: Digital Electronics and Logic Gates
Distinguish between intrinsic and extrinsic semiconductor. (Give any two points).
Concept: Extrinsic Semiconductor
Draw the schematic symbols for AND, OR, NOT and NAND gate
Concept: Digital Electronics and Logic Gates
