Class test — I

Subject: Physics

Test: Class test — I

Class: ISC — II, PUC — II

Question 1

Whats the unit of capacitance?

Question 2

What is the amount of work done on an equipotential surface?

Question 3

Between an $\alpha$-particle and a proton which has more energy in a 100-Volt region?

Question 4

Which is correct for a series combination of capacitance?

(a) $C = C_1+C_2$ (b) $C = \frac{1}{C_1} + \frac{1}{C_2}$ (c) $\frac{1}{C} = \frac{1}{C_1} + \frac{1}{C_2}$.

Question 5

Electric field intensity $(E =|\vec{E}|)$ for a spherical metallic conductor is

(a) $\frac{\sigma}{\epsilon_0}$ (b) $\frac{2\sigma}{\epsilon_0}$ (c) $\frac{2q\sigma}{\epsilon_0}$.

Question 6

For a Van de Graaff generator

(a) Outer sphere is at higher potential?

(b) Inner sphere is at higher potential?

Question 7

Cyclotron frequency

(a) is proportional to energy (b) depends on magnetic field (B)

Question 8

Angular momentum L is an integral multiple of which constant?

(a) Fine structure constant

(b) Rydberg constant

(c) Universal gas constant

(d) Planck’s constant

Question 9

Ground state speed of $e^{-}$ in the H-atom in terms of speed-of-light c is

(a) $\frac{c}{137}$ (b) $c\times 137$ (c) $\frac{\alpha\times c}{137}$ (d) $\frac{c}{10}$

Question 10

Whats the energy of H-atom according to Niels Bohr?

(a) $-\frac{13.61}{n^2}\hspace{2pt}eV$ (b) $+\frac{13.61}{n^2}\hspace{2pt}eV$ (c) $-\frac{13.61}{n}\hspace{2pt}eV$ (d) $-13.61 \hspace{2pt} eV$.

Class test — II.

Subject: Physics

Test: Class test — II

Class: ISC — II, PUC — II

Question 1

Which property of the charge is valid?

(a) Charge is a vector quantity

(b) Conservation of quantity of charge

(c) Flux of charge outside a Gaussian surface is conserved.

Question 2

Which is the drawback of Rutherford’s model?

(a) Atomic instability due to radiative energy loss.

(b) Line spectrum of H-atom is inexplicable.

(c) Can’t explain H-atom.

Question 3

Which are drawbacks of Bohr’s theory?

(a) Can’t explain Balmer series (b) Can’t explain atomic stability (c) Can’t explain N-spectrum.

Question 4

Write out the relation between $\epsilon, \epsilon_0, \epsilon_r$.

Question 5

If dielectric material of dielectric constant K is introduced in a space, which is reduced $E, V \hspace{2pt}or\hspace{2pt}Q$?

Question 6

Half life of Ra is $x \hspace{2pt} hrs$, of N is $y \hspace{2pt}hrs$, where $x. If we start with 1000 of each which is available in less quantity, after an hour?

Question 7

Which is used in a nuclear reactor as a moderator material and why?

Question 8

What is the energy of radiation between H-atom levels, $n = 2, n = 3$?

Question 9

Write the charge — in units of electron’s charge e, and mass — in units of amu = u, of proton (p) electron (e), $\alpha -{particle}$ and $^{12}C_6$.

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I am an experimental particle physicist, traveler, teacher, researcher, scientist and communicator of ideas. I am a quarkist and a bit quirky ! Hypothesis non fingo, eppur si muove, dubito cogito ergo sum are things that turn me on ! Researcher in experimental high energy physics (aka elementary particle physics; like “quarks, leptons & mesons and baryons”) … Teacher of Physics (and occasionally chemistry and maths) Blogger (check my website; mdashf.org) ! Love to read read and read but only stuff that interest me. Love to puff away my time in frivolities, just dreaming and may be thinking. Right now desperately trying to streamline myself.