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The Brewsters angle $i_b$ for an interface should be
A full wave rectifier circuit consists of two p-n junction diodes, a centre-tapped transformer, capacitor and a load resistance. Which of these components remove the ac ripple from the rectified output?
An ideal gas is compressed to half its initial volume by means of several processes. Which of the following processes results in the maximum work being done on the gas?
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?
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:
A person sitting on the ground floor of a building notices through the window, of height $1.5 \text{ m}$, a ball dropped from the roof of the building crosses the window in $0.1 \text{ s}$. What is the velocity of the ball when it is at the topmost point of the window? ($g=10 \text{ m/s}^2$)