List of practice Questions

The number of extensive and intensive properties in the following list is respectively: Mass, temperature, pressure, enthalpy, heat capacity, internal energy, density
If one litre of an ideal gas at a pressure of 20 atm expands isothermally and reversibly to a final volume of 'X' L by absorbing 92.12 L.atm heat, 'X' (in L) is
In a transistor circuit, if emitter and collector connections are interchanged then
A body is thrown vertically upwards with an initial velocity \( u \). If \( g \) is the acceleration due to gravity, then the total time taken for the body to return to the starting point is:
In which of the following, orbitals are correctly arranged in the increasing order of their energies?
The energy (in J) released when an excited electron of 5$^{\text{th}}$ orbit of hydrogen atom returns to its ground state is
The ion with smallest radius among the following is
The correct order of the metallic nature of the following elements is
Match the following
hybridisation
The self-inductance of a long solenoid of cross-sectional area \( A \), length \( l \) and \( n \) turns per unit length is given by:
A resistor of resistance 40 \( \Omega \), a capacitor of capacitive reactance 20 \( \Omega \) and an inductor of inductive reactance 50 \( \Omega \) are connected in series to an ac source of 100 V. The current through the circuit is:
To heat the food containing water, the frequency of the microwaves used in microwave oven is:
The threshold wavelength of a photosensitive material is equal to the frequency of H$_\alpha$ line of hydrogen. If a photon whose frequency equal to the frequency of H$_\beta$ line of hydrogen is incident on this photosensitive material, the maximum kinetic energy of the emitted photoelectrons is: (R -- Rydberg's constant, h -- Planck's constant and c -- speed of light in vacuum)
In a hydrogen atom, an electron in an orbit with principal quantum number \( n \) jumps to the first excited state, emitting a photon of wavelength \( \lambda \). Then the value of \( n \) is:
The following is not used as a nuclear fuel.
A radioactive material whose half life period is 2 years weighs 1 g and is stored in the laboratory for 4 years. Then the amount of remaining radioactive material is
Eight drops of mercury, each of the same radius and same charge, combine to form a bigger drop. The ratio of the capacitance of the bigger drop to that of each smaller drop is:
The given circuit shows two capacitors connected to a battery. After the capacitors are completely charged, the battery is removed and the capacitors are connected with plates of opposite polarity together. Then the energy lost in the process is:
two capacitors connected to a battery
Two cells with same emf E but different internal resistances, $r_1$ and $r_2$ are connected in series to an external resistance R. If the potential difference across the first cell is zero then the value of R is
Choose the correct option with respect to the statements A and B.
A cyclotron’s oscillator frequency is 20 MHz. The operating magnetic field for accelerating protons is
(Charge of proton = \( 1.6 \times 10^{-19} \) C, mass of proton = \( 1.67 \times 10^{-27} \) kg)
A straight wire carrying a current of 12 A is bent into a semi-circular arc of radius 2 cm as shown in the figure. Then the magnetic field due to the straight segments at the centre of the arc is
A straight wire carrying a current of 12 A
Which of the following do not exist?
A diatomic gas has an initial internal energy of 80 cal. A work of 18 cal is done on the gas, and the gas releases heat energy of 42 J. The final internal energy of the gas is:
Three moles of a gas at a temperature \( T \) are heated to thrice its volume by keeping the pressure constant. If \( \gamma \) is the ratio of specific heats, then the increase in internal energy of the gas is: