Write two important advantages of reflecting telescope over a refracting telescope.
Concept: Optical Instruments > Telescope
Give the truth table and circuit symbol for NAND gate
Concept: Digital Electronics and Logic Gates
Identify the part of the electromagnetic spectrum which is suitable for radar system used in aircraft navigation.
Concept: Electromagnetic Spectrum
Draw a labelled ray diagram showing the formation of a final image by a compound microscope at least distance of distinct vision
Concept: Optical Instruments > The Microscope
State de Broglie hypothesis
Concept: de-Broglie Relation
Derive Snell’s law on the basis of Huygen’s wave theory when the light is travelling from a denser to a rarer medium.
Concept: Snell’s Law
Find the de Broglie wavelength of electrons moving with a speed of 7 × 106 ms -1.
Concept: de-Broglie Relation
On the basis of Bohr's theory, derive an expression for the radius of the nth orbit of an electron of the hydrogen atom.
Concept: Bohr’s Model for Hydrogen Atom
Write one balanced equation to show Nuclear fission
Concept: Nuclear Energy > Nuclear Fusion – Energy Generation in Stars
What is the use of Zener diode?
Concept: Semiconductor Diode
A short electric dipole (which consists of two point charges, +q and -q) is placed at the centre 0 and inside a large cube (ABCDEFGH) of length L, as shown in Figure 1. The electric flux, emanating through the cube is:
a) `q"/"4piin_9L`
b) zero
c) `q"/"2piin_0L`
d) `q"/"3piin_0L`
Concept: Electric Dipole
What is meant by the term Quantization of charge?
Concept: Quantisation of Charge
Derive an expression for the intensity of electric field at a point in broadside position or on [4)
an equatorial line of an electric dipole.
Concept: Electric Dipole
Maximum torque acting on an electric dipole of moment 3×10-29 Cm in a uniform electric field E is 6 × 10-25 Nm. Find E.
Concept: Dipole in a Uniform External Field
The intensity of the electric field at a perpendicular distance of 0·5 m from an infinitely long line charge having linear charge density (λ) is 3-6 × 103 Vm-1. Find the value of λ.
Concept: Electric Field Lines
In Figure 1 below, a charge Q is fixed. Another charge q is moved along a circular arc MN of radius r around it, from the point M to the point N such that the length of the arc MN = l. The work done in this process is:
figure 1
Concept: Basic Properties of Electric Charge
A charged oil drop weighing 1.6 x 10-15 N is found to remain suspended in a uniform electric field of intensity 2 x 103 Nc-1. Find the charge on the drop.
Concept: Electric Field Due to a Point Charge
Two-point charges Q1 = 400 μC and Q2 = 100 μC are kept fixed, 60 cm apart in a vacuum. Find the intensity of the electric field at the midpoint of the line joining Q1 and Q2.
Concept: Electric Dipole
State Gauss’Law.
Concept: Applications of Gauss’s Law
In an electric dipole, at which point is the electric potential zero ?
Concept: Electric Dipole
