List of top Questions asked in MET- 2020

Radiation, with wavelength 6561 $?$ falls on a metal surface to produce photoelectrons. The electrons are made to enter a uniform magnetic field of $3 \times 10^{-4} T$. If the radius of the largest circular path followed by the electrons is 10 mm, the work function of the metal is close to :
A body of mass \( m \) rises to a height \( h = \frac{R}{5} \) from the earth's surface, where \( R \) is the earth’s radius. If \( g \) is acceleration due to gravity at the earth’s surface, then the increase in potential energy is:
The energy required to break the covalent bond in a semiconductor is:
When a glass prism of refracting angle \(60^\circ\) is immersed in a liquid its angle of minimum deviation is \(30^\circ\). The critical angle of glass with respect to the liquid medium is:
Faraday constant:
A comb is run through wet hair on a rainy day, then:
The displacement-time graph of a particle moving along a straight line is shown in the figure. The acceleration-time graph of this particle is:
The maximum kinetic energy of photoelectrons coming out of a metal surface is \(10 \, \text{eV}\). The minimum voltage required to stop the emission of electrons from this metal surface is:
Thermal radiation exist in which part of electromagnetic spectrum?
A rod of length \(L\) is composed of two equal parts: half wood (mass \(m_w\)) and half brass (mass \(m_b\)). The moment of inertia about an axis through its centre and perpendicular to the rod is:
A particle, doing simple harmonic motion, at a distance \(3\,cm\) from mean position has acceleration \(12\,cm/s^2\). What is its time period?
A step up transformer has turn ratio \(10:1\). A cell of emf \(2\,V\) is fed to the primary, then the secondary voltage developed is:
A man at a distance \(11\,km\) from two pillars wants to see them separately. What will be the approximate distance between the pillars?
Dimensions of Stefan’s constant is:
Time period of oscillation of mass \(m\) suspended from a spring is \(T\). What is the time period when the spring is cut in half and the same mass is suspended from one of the halves?
An electric current of \(2\,A\) passes through a wire of resistance \(25\,\Omega\). How much heat will be generated in \(1\,min\)?
A mass \( m \) hanging from a spring is doing simple harmonic motion with frequency \( f \). If the mass is increased by 4 times, then frequency will be:
Internal energy of a gas remains unchanged in:
I. an isothermal process
II. an adiabatic process
III. a reversible process
IV. a cyclic process
An electric charge in uniform motion produces:
If \( \lambda \) is the incident wavelength and \( \lambda_0 \) is the threshold wavelength for a metal surface, photoelectric effect takes place only if:
The mass number of an atom is 15 and its atomic number is 7. Now, this atom absorbs an \( \alpha \)-particle and emits a proton. What will be the mass number of changed atom?
What is the direction of the electric field at the centre \(O\) of the square in the figure shown below? Given that, \( q = 10\,\text{nC} \) and the side of the square is \(5\,\text{cm}\).
Which equation is valid for adiabatic process?
Which of the following relation is correct? (\(v_{\mathrm{rms}}\): root mean square velocity, \(\bar{v}\): mean velocity and \(v_{\mathrm{mp}}\): most probable velocity)
The effect of reverse bias in a junction diode on its potential barrier is: