Discuss $p-n$ junction diode under forward bias.
View full solution →Question types
JUNE 2024 question types
77 questions across 4 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.
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Sample Questions
JUNE 2024 questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
Explain Nuclear binding energy.
A hydrogen atom initially in the ground level absorbs a photon, which excites it to the $n=4$ level. Determine the wavelength of photon.
\[\left(h=6.625 \times 10^{-34} Js \& c=3 \times 10^8 ms^{-1}\right)\]
View full solution →\[\left(h=6.625 \times 10^{-34} Js \& c=3 \times 10^8 ms^{-1}\right)\]
Light of frequency $9.21 \times 10^{14} Hz$ is incident on a metal surface. Electrons with a maximum speed $6.0 \times 10^5 ms^{-1}$ are ejected from the surface. What is the threshold frequency for photoemission of electrons?
\[\left(h=6.625 \times 10^{-34} Js\right)\]
View full solution →\[\left(h=6.625 \times 10^{-34} Js\right)\]
Derive an expression for the effective focal length of the combination of two thin lenses in contact.
Explain use of juction diode as full wave rectifier.
A given coin has a mass of 3.0 g . Calculate the nuclear energy that would be required to separate all the neutrons and protons from each other. For simplicity assume that the coin is entirely made of ${ }_{29}^{63} Cu$ atoms (of mass 62.92960 u )
View full solution →The work function of caesium is 2.14 eV . Find
(a) The threshold frequency for caesium.
(b) The wavelength of incident light if photocurrent is brought to zero by a stopping potential of $0.60 V .\left( h =6.625 \times 10^{-34} Js \right)$
View full solution →(a) The threshold frequency for caesium.
(b) The wavelength of incident light if photocurrent is brought to zero by a stopping potential of $0.60 V .\left( h =6.625 \times 10^{-34} Js \right)$
Derive $\frac{n_1}{-u}+\frac{n_2}{v}=\frac{n_2-n_1}{ R }$ for refraction at a spherical surface.
View full solution →A sinusoidal voltage of peak value 283 V and frequency 50 Hz is applied to a series LCR circuit in which $R =3 \Omega, L=25.48 mH$ and $C =796 \mu F$. Find
(a) The impedance of the circuit.
(b) The phase difference between the voltage across the source and the current.
(c) The power dissipated in the circuit.
View full solution →(a) The impedance of the circuit.
(b) The phase difference between the voltage across the source and the current.
(c) The power dissipated in the circuit.
Explain energy generation in stars through the process of nuclear fusion and explain proton. proton cycle.
A beam of light consisting of two wavelengths, 4500Å and 6000Å is used to obtain interference fringes in a Young's double slit experiment.
(a) Find the distance of the third dark fringe on the screen from the central maximum for wavelength 4500Å .
(b) What is the least distance from the central maximum where the bright fringe due to 4500Å coincides with dark fringe due to 6000Å.
(Here width of slit $d =0.15 cm$, distance between slit and screen $D=90 cm$ )
View full solution →(a) Find the distance of the third dark fringe on the screen from the central maximum for wavelength 4500Å .
(b) What is the least distance from the central maximum where the bright fringe due to 4500Å coincides with dark fringe due to 6000Å.
(Here width of slit $d =0.15 cm$, distance between slit and screen $D=90 cm$ )
Derive $\delta=i+e- A$ for a Prism. Also derive an expression for the refractive index of material of the Prism.
View full solution →Explain AC circuit with only an inductor.
Derive formula of torque acting on a rectangular current carrying coil placed in a uniform magnetic field in such a way that its magnetic moment makes an angle $\theta$ with the magnetic field.
View full solution →The expression for the magnetic energy per unit volume stored in a solenoid in terms of magnetic field is ___________ .
- ✓$\frac{1}{2} \frac{B^2}{\mu_0}$
- B$\frac{1}{2} B \mu_0^2$
- C$\frac{1}{2} \frac{B}{\mu_0}$
- D$\frac{1}{2} B^2 \mu_0$
Answer: A.
View full solution →Following figure shows planar loops of different shapes moving out of or into a region of a magnetic field which is directed normal to the plane of the loop away from the reader. The direction of induced current is in anticlockwise ___________ .
- Ain the loops (ii) and (iii)
- Bonly in the loop (ii)
- Conly in the loop (iii)
- ✓only in the loop (i)
Answer: D.
View full solution →A wheel with 10 metallic spokes each 0.5 m long is rotated with a speed of $120 rev / min$ in a plane normal to the horizontal component of earth's magnetic field $H _{ E }$ at a place. If $H _{ E }=0.4 G$ at the place, then induced $emf =$ ___________ $\left(1 G =10^{-4} T\right)$
- A$6.28 \times 10^{-5} \mu V$
- B$6.28 \times 10^{-2} \mu V$
- ✓$6.28 \times 10^{-2} m V$
- D$6.28 \times 10^{-5} m V$
Answer: C.
View full solution →Dimensional formula of self-inductance is ___________ .
- A$M ^1 L^2 T^{-2} A^2$
- B$M ^1 L^{-2} T^{-2} A^2$
- C$M ^{-1} L^{-2} T^{-2} A^{-2}$
- ✓$M ^1 L^2 T^{-2} A^{-2}$
Answer: D.
View full solution →The phenomenon of perfect diamagnetism in super conductors is called the ___________ .
- ACrompton effect
- BLorentz effect
- ✓Meissner effect
- DCurie's effect
Answer: C.
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