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Practice Online Test Series for JEE Main 2018 & NEET 2018
Two capacitors of 25 `muF` and 100 `muF` are connected in series to a source of 120 V. Keeping their charges unchanged they are separated and connected in parallel to each other. Find out energy loss in the process
Maxwell"s velocity distribution curve is given for the same quantity two different temperatures. For the given curves
A vessel contains oil (density = 0.8 g c`m^(–3)`) over mercury (density = 13.6 g c`m^(–3)`). A uniform sphere floats with half its volume immersed in mercury and the other half in oil. The density of the material of sphere in g c`m^(–3)` is
A circular platform is mounted on a frictionless vertical axle. Its radius R = 2m and its moment of inertia about the axle is 200 kg `m^2`. It is initially at rest. A 50 kg man stands on the edge of the platform and begins to walk along the edge at the speed of 1 m`s^(–1)` relative to the ground. Time taken by the man to complete one revolution with respect to disc is
5 mole of an ideal gas with `gamma=7/5` initially at STP are compressed adiabatically so that its temperature becomes 400ºC. The increase in the internal energy of gas in kJ is
The intensity of magnetic field at a point X on the axis of a small magnet is equal to the field intensity at another point Y on its equatorial axis. The ratio of distances of X and Y from the centre of the magnet will be
A charged particle of mass m and charge q is released from rest in an electric field of constant magnitude E. The kinetic energy of the particle after time t is
A gas bubble from an explosion under water oscillates with a time period T, depends upon static pressure p, density of water `rho` and the total energy of explosion E, Find the expression for the time period T. k is a dimensionless constant
Two weights `w_1` and `w_2` are suspended from the ends of a light string over a smooth fixed pulley. If the pulley is pulled up with acceleraton g, the tension in the string will be
A 15 g ball is shot from a spring gun whose spring has a force constant 600 N`m^(–1)`. The spring is compressed by 5 cm. The greatest possible horizontal range of the ball for this compression (take g = 10 m`s^(–2)`)
lf coefficient of friction between all surfaces is 0.4. then the minimum horizontal force F to have the equilibrium of the system will be. (g = 10m / `s^2`)
Air of density `rho` moving with a velocity v strikes perpendicularly the inclined surface of area A of a wedge kept on a horizontal surface. The mass of the wedge is m. Assuming that air molecules move along the surface of the wedge after collision, the minimum value of, the coefficient of friction between the wedge and the ground so that the wedge does not move is
On a block of mass 1kg resting on a rough horizontal xy plane `(mu_s=0.6, mu_k=0.5)` force `vecF =8hati-6hatj+2hatk` acts. The friction force on the block is `(g=10ms^(-2))`
Two blocks m and M are connected by a light string passing over a smooth pulley When set free m moves up by 1.4 m in 2s. The ratio `m/M` is (g=10 m`s^(-2)`)
A uniform rope has been placed on a sloping surface as shown in the fig. The vertical separation and horizontal separation between the end points of the rope are H and X respectively. The friction coefficient `(mu)`is just large enough to prevent the rope from sliding down. The value of `mu` is
A car moves around a circular arc subtending an angle of `60^o` at the center. The car moves at a constant speed `u_o` and magnitude of its instantaneous acceleration is `a_o`. The average acceleration of the car over the `60^o` arc is
A stationary body of mass m is slowly lowered onto a rough, long. massive platform moving at a constant velocity `v_o =` 4m / s . The total distance the body will slide with respect to the platform is
A block of mass m is at rest with respect to a rough incline kept in elevator moving up with acceleration a. Which of the following statements is correct?
A particle is projected along a horizontal surface whose coefficient of friction varies as `mu=A/r^2`, where r is the distance from the origin is metres and A is a positive constant. The initial distance of the particle is 1m from the origin and its velocity is radially outwards. The minimum initial velocity at this point so the particle never stops is
A ball of mass M collides elastically with another stationary ball of mass m. If M > m, the maximum angle of deflection of M is
