Q. What is the signeficance of binding energy per nucleon of a nucleus of a radioactive element?

Q. Wavelengths of the first lines of the Lyman series, Paschen series and Balmer series in hydrogen spectrum are denoted by ${\lambda }_L,{\lambda }_{P}and{\lambda }_B$ respectively. Arrange these wavelength in increasing order.

Q. Two points charges of 10C each are kept at a distance of 3m in vacuum. Calculate their electrostatic potential energy.

Q. If $E_P$ and $E_k$ represent potential energy and kinetic energy respectively, of an orbital electron, then according to Bohr's theory:

1. $E_k=-E_p$
2. $E_k=-2E_p$
3. $E_k=2E_p$
4. $E_k=-E_p/2$

Q. Derive an expression for intensity of electric field at a point broadside position or an equatorial line of an electric dipole.

Q. State Moseley's law.

Q. A moving electron entres a uniform and perpendicular magnetic field. Inside the magnetic field, the electron travels along:

1. A straight line
2. A parabola
3. A hyperbola
4. A circle

Q. Draw labelled graphs to show how electrical resistance varies with temperature for:
(a) A metallic wire.

Q. An emf of 2V is induced in a coil when current in it is changed from 0A to 10A in 0.40 sec. Find the coefficient of self-inductance of the coil.

Q. State how magnetic susceptibility is different for the three types of magnetic materials, i.e., diamagnetic, paramagnetic and ferromagnetic materials.

Q. Draw labelled graphs to show how electrical resistance varies with temperature for:
(a) A piece of carbon.

Q. A short electric dipole (which consists of two point charges $+qand-q$) is placed at the centre O and inside a large cube (ABCDEFGH) of length L, as shown in figure. The electric flux, emanating through the cube is:

1. Zero
2. $q/3\pi {\epsilon }_{0}L$
3. $q/4\pi {\epsilon }_{0}L$
4. $q/2\pi {\epsilon }_{0}L$

Q. State any one advantage of using a reflecting telescope in place of a refracting telescope.

Q. Two resister $R_1=400\Omega$ and $R_2=20\Omega$ are connected in parallel to a battery. If heating power developed in $R_1$ in 25 W, find the heating power developed in $R_2$.

Q. What type of lens is used to correct long-sightedness?

Q. Four capacitors, $C_1,C_2,C_3$ and $C_4$ are connected as shown in figure below. Calculate equivalent capacitance of the circuit between points X and Y.

Q. With the help of labelled diagram, show that the balancing condition of Wheatstone bridge is:

Q. Write any one balanced equation representing nuclear fission.

Q. A monochromatic ray of light falls on a regular prism. What is the relation between angle of incidence and angle of emergence in the case of minimum deviation ?

Q. How are electric vector $\overrightarrow{\left(E\right)}$, magnetic vector $\overrightarrow{\left(B\right)}$ velocity vector $\overrightarrow{\left(c\right)}$ oriented in an electromagnetic wave ?

Q. The equivalent resistance between points $a$ and $f$ of the networks shown in figure.

1. 24 $\Omega$
2. 110 $\Omega$
3. 140 $\Omega$
4. 200 $\Omega$

Q. A resistor $R$ is connected to a cell of emf $e$ and internal resistance $r$. Potential difference across the resistor $R$ is found to be $V$. State the relation between $e,V,R$ and $r$.

Q. Three identical cells each of emf 2V and internal resistance 1$\Omega$ are connected in series to form a battery. The battery is then connected to a parallel combination of two identical resistors, each of resistance 6$\Omega$. Find the current delivered by the battery.

Q. What is the difference between analog signal and digital signal?

Q. Name three elements of the earth's magnetic field which help in defining earth's magnetic field completely.

Q. A $10m$ long uniform metallic write having a resistance of $20\Omega$ is used as a potentiometer wire. This wire is connected in series with another resistance of $480\Omega$ and a battery of emf $5V$ having negligible internal resistance. If an unknown emf e is balanced across $6m$ of the potentiometer wire, calculate:
(i) The potential gradient across the potentiometer wire.
(ii) The value of the unknown emf e.

Q. Explain the term hysteresis.

Q. What is meant by term Quantization of of charge?

Q. State any two methods by which ordinary light can be polarised.

Q. A fish which is at a depth of 12 cm in $(\mu =\frac{4}{3})$ is viewed by an observer on the bank of lake. Its apparent depth as observed by the observer is:

1. 3 cm
2. 9 cm
3. 12 cm
4. 16 cm