Browse and search thousands of solved questions for your preparation.
Free questions with full explanations — locked behind signup to protect quality.
The dimensional formula for Planck's constant (h) is
A transistor is operated in a common emitter configuration at $V_c = 2 \text{ V}$ such that a change in the base current from $100 \text{ } \mu\text{A}$ to $300 \text{ } \mu\text{A}$ produces a change in the collector current from $10 \text{ mA}$ to $20 \text{ mA}$. The current gain is:
Two bodies of mass $4 \text{ kg}$ and $6 \text{ kg}$ are tied to the ends of a massless string. The string passes over a pulley, which is frictionless (see figure). The acceleration of the system in terms of acceleration due to gravity ($g$) is:
The half-life of a radioactive nuclide is 100 hours. The fraction of original activity that will remain after 150 hours would be
Curie is a unit of:
As the temperature increases, the electrical resistance:
A metallic bar of Young's modulus $0.5 \times 10^{11}\text{ N m}^{-2}$, coefficient of linear thermal expansion $10^{-5}\ ^\circ\text{C}^{-1}$, length $1\text{ m}$ and cross-sectional area $10^{-3}\text{ m}^2$ is heated from $0^\circ\text{C}$ to $100^\circ\text{C}$ without expansion or bending. The compressive force developed in the metallic bar is:
Length cannot be measured by
During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its temperature. The ratio of $C_P/C_V$ for the gas is equal to:
The equivalent capacitance of the combination shown in the figure is
Unit of moment of inertia in MKS system
Two identical piano wires kept under the same tension $T$ have a fundamental frequency of $600 \text{ Hz}$. The fractional increase in the tension of one of the wires which will lead to the occurrence of $6 \text{ beats/s}$ when both the wires oscillate together would be:
Two equal negative charges of charge -q are fixed at the points (0, a) and (0, -a) on the Y-axis. A positive charge Q is released from rest at the point (2a, 0) on the X-axis. The charge Q will:
A car moving with a speed of $40 \text{ km/h}$ can be stopped by applying brakes for atleast $2 \text{ m}$. If the same car is moving with a speed of $80 \text{ km/h}$, what is the minimum stopping distance?
A body A starts from rest with an acceleration $a_1$. After $2$ seconds, another body B starts from rest with an acceleration $a_2$. If they travel equal distances in the $5^{\text{th}}$ second, after the start of A, then the ratio $a_1 : a_2$ is equal to:
The displacement of a particle is given by $y = a + bt + ct^2 - dt^4$. The initial velocity and acceleration are, respectively:
Acceleration-time graph of a body is shown. The corresponding velocity-time graph of the same body is:
The graph which shows the variation of the de Broglie wavelength ($\lambda$) of a particle and its associated momentum ($p$) is
In half wave rectification, if the input frequency is $60\text{ Hz}$, then the output frequency would be
Two ideal diodes are connected to a battery as shown in the circuit. The current supplied by the battery is: