In a full wave rectifier with input frequency 50 Hz, the ripple in the output is mainly of the frequency (in Hz)
A particle of mass 0.6 gm and having charge of 25 nC is moving horizontally with a uniform velocity 1.2 x 104 ms-1 in a uniform magnetic field, then the value of the magnetic induction is (g = 10 m s-2 )
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A series combination of R,L,C is connected to an a.c. source. If resistance is 3 Ω and the circuit is :
A fighter pilot flies along a vertical circle of radius 1 km. At the topmost point of the circle, he feels weightless. What is the speed of the fighter plane? (Acceleration due to gravity = 10 ms–2)
Superconductivity was observed when the temperature of mercury was cooled down to
The coefficient of mutual inductance, when magnetic flux changes by 2 X 10-2 Wb and current changes by 0.01 A is
Radio wave diffract around building although light waves do not. The reason is that radio waves:
A parallel plate capacitor C with plates of unit area and separation d is filled with a liquid of dielectric constant K = 2. The level of liquid is d 3 initially. Suppose the liquid level decreases at a constant speed V, the time constant as a function of time t is
A 10 μF capacitor is charged to a potential difference 50 V and it is then connected to another uncharged capacitor in parallel. If common potential difference becomes 20 V, then capacitance of the second capacitor is
In a gravitational field, the work done in transporting mass from one point to another
A block of 1 kg is stopped aganist a wall by aplying a force F perpendicular to the wall. If μ = 0.2 then minimum value of F will be
If a planet consist of a satellite whose mass and radius were both half that of the earth, the acceleration dur to gravity at its surface would be (g on earth = 9.8 m/sec2)
At a common temperture, a block of wood and a block of metal feel equally cold or hot. The temperatures of block of wood and block of metal are
In Young's double slit experiment, if one slit is covered with red filter and the other slit is covered by green filter, then their interference pattern will be
A cell is connected between two points of a uniformly thick circular conductor. i₁ and i₂ are the currents flowing in two parts of the circular conductor of radius a. The magnetic field at the centre of the loop will be
On reducing the volume of the gas at constant temperature, the pressure of the gas
A 50 Ω galvanometer gets full scale deflection when a current of 0.01 A pass through the coil. When it is converted to a 10 A ammeter, the shunt resistance is
An electron moves in a circular orbit with a uniform velocity v. It produces a magentic field B at the centre of the circle. The radius of the circle is proportional to
The susceptibility of magnetic substance for different purposes is determined by its
The field of a short bar magnet at a distance of 1 m on its axial line is 1 oersted. At a distance of 2 m on the same line, the intensity in oersted will be
The magnetic field at a point at a distance 'd' from the centre on axial line of a very short bar magnet of magnetic moment M is B. The magnetic field at a distance '2d' from centre on equitorial line of magnet of magnetic moment 8 M, will be
A solid of density ρ₁ is floating in a liquid of density ρ₂. If ν is the volume of solid submerged in the liquid and V is the total volume of the solid, the ν/V is equal to
Horizontal tube of non-uniform cross-section has radii of 0.1m and 0.05m respectively at M and N. For a streamline flow of liquid the rate of liquid flow is
A cube is subjected to a uniform volumatric compression. If side of cube decreases by 1%, then its bulk strain is
Three point masses m₁,m₂,m₃ are located at the vertices of an equilateral triangle of length 'a'. The moment of inertia of the system about an axis along the altitude of the triangle passing through m₁ is
A car accelerated from initial position and then returned at initial point, then