Question Bank Directory

The work done during the expansion of a gas from a volume of $4\text{ dm}^3$ to $6\text{ dm}^3$ against a constant external pressure of $3\text{ atm}$ is:

For irreversible expansion of an ideal gas under isothermal conditions, the correct option is:

For the logic circuit shown, the truth table is:

If we study the vibration of a pipe open at both ends, then which of the following statements is not true:

A current-carrying closed loop in the form of a right-angle isosceles triangle ABC is placed in a uniform magnetic field acting along AB. If the magnetic force on the arm BC is F, the force on the arm AC is:

For a given reaction, if $\Delta H = 35.5 \text{ kJ/mol}$ and $\Delta S = 83.6 \text{ J/K}\cdot\text{mol}$, at what temperature is the reaction spontaneous? (Assume $\Delta H$ and $\Delta S$ remain constant with temperature.)

Match the trophic levels with their correct species examples in grassland ecosystem. (a) Fourth trophic level (i) Crow (b) Second trophic level (ii) Vulture (c) First trophic level (iii) Rabbit (d) Third trophic level (iv) Grass Select the correct option

For a plane electromagnetic wave propagating in $x$-direction, which one of the following combination gives the correct possible directions for electric field ($E$) and magnetic field ($B$) respectively?

An electron is moving in a circular path under the influence of a transverse magnetic field of $3.57 \times 10^{-2}$ T. If the value of $e/m$ is $1.76 \times 10^{11}$ C/kg, the frequency of revolution of the electron is:

How many true breeding pea plant varieties did Mendel select as pairs, which were similar except in one character with contrasting traits?

Consider the following reactions: (i) $H^+(aq) + OH^-(aq) \rightarrow H_2O(l); \Delta H = -x_1 \text{ kJ mol}^{-1}$ (ii) $H_2(g) + \frac{1}{2}O_2(g) \rightarrow H_2O(l); \Delta H = -x_2 \text{ kJ mol}^{-1}$ (iii) $CO_2(g) + H_2(g) \rightarrow CO(g) + H_2O(l); \Delta H = -x_3 \text{ kJ mol}^{-1}$ (iv) $C_2H_5(g) + \frac{5}{2}O_2(g) \rightarrow 2CO_2(g) + H_2O(l); \Delta H = -x_4 \text{ kJ mol}^{-1}$ Enthalpy of formation of $H_2O(l)$ is:

Which of the following statements is not correct?

A series LCR circuit is connected to an ac voltage source. When L is removed from the circuit, the phase difference between current and voltage is $\frac{\pi}{3}$. If instead C is removed from the circuit, the phase difference is again $\frac{\pi}{3}$ between current and voltage. The power factor of the circuit is :

A proton and an $\alpha$-particle both enter a region of uniform magnetic field $B$, moving at right angles to the field. If the radius of circular orbits for both particles is equal and the kinetic energy acquired by the proton is $1\text{ MeV}$, the energy acquired by the $\alpha$-particle will be:

The formation of a solution from two components can be considered as: (i) Pure solvent → separated solvent molecules, ∆H₁ (ii) Pure solute → separated solute molecules, ∆H₂ (iii) Separated solvent and solute molecules → solution, ∆H₃ The solution so formed will be ideal if:

The transverse section of a plant shows following anatomical features : (a) Large number of scattered vascular bundles surrounded by bundle sheath (b) Large conspicuous parenchymatous ground tissue (c) Vascular bundles conjoint and closed (d) Phloem parenchyma absent. Identify the category of plant and its part :

An infinitely long straight conductor carries a current of $5\text{ A}$ as shown. An electron is moving with a speed of $10^5\text{ m/s}$ parallel to the conductor. The perpendicular distance between the electron and the conductor is $20\text{ cm}$ at an instant. Calculate the magnitude of the force experienced by the electron at that instant.

A millivoltmeter of $25 \text{ mV}$ range is to be converted into an ammeter of $25 \text{ A}$ range. The value (in ohm) of necessary shunt will be:

Condoms are barriers that cover:

Match the items given in Column-I with those in Column-II and select the correct option given below: Column-I (a) Cristae (b) Cisternae (c) Thylakoids Column-II (i) Flat membranous sacs in stroma (ii) Infoldings in mitochondria (iii) Disc-shaped sacs in Golgi apparatus