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Practice Online Test Series for JEE Main 2018 & NEET 2018
Force acting on a particle varies with the distance travelled by the particle as `F prop 1/(X)^(1/3)` then power due to this force varies with `X` as :
A particle of mass 1kg is moving along a straight line. Its velocity-time graph is as shown in figure.Work done by the resultant of all forces acting on the particle from t = 0 to t = 8 s is :
A rough vertical board has an acceleration ‘a’ so that a 2 kg block pressing against it does not fall. The coefficient of friction between the block and the board should be:
A passenger is standing ‘d’ m away from a bus. The bus begins to move with constant acceleration a. To catch the bus, the passenger runs at a constant speed v towards the bus. What must be the minimum speed of the passenger so that he may catch the bus?
The equation of state of some gases can be expressed as; `(P+a/V^2)(V-b)=RT` where P is the pressure, V the volume,T the absolute temperature and a, b, R are constants. The dimensions of ‘a’ are:
An electron moving with a speed u along the positive x-axis at y=0 enters a region of uniform magnetic field `vecB=-B_0veck` which exists to the right of y-axis. The electron exits from the region after some time with the speed v at co-ordinate y, then
If an electric heater is rated at 1000 W, then the time required to heat one litre of water from `20^o C` to `60^o C` is:
Charge q on a capacitor varies with voltage V as shown. The area of `triangleOPM` represents:
Two conductors of the same shape and size. One of copper and the other of aluminium (less conducting) are placed in a uniform electric field the charge induced in aluminium.
For a satellite if the time of revolution is T, then its KE is proportional to:
If wire of length L form a loop of radius R and have n turn. Find magnetic field at center of loop. Current flow in loop is I:
The equivalent resistance between A and B in the figure is:
Three capacitors 1, 2 and `4muF` are connect in series to a 10 volts source. The charge on the plates of middle capacitor is:
Force between A and B is F. If 75% charge of A is transferred to B then force between A and B is:
A simple pendulum performs S. H. M about x=0 with an amplitude A and time period T. The speed of pendulum at `x=A/2` will be:
In bio savart law direction of magnetic field is shown by-
`dvecB=(mu_0)/(4pi)(Ivec(dl)xxvecr)/r^3`
In the circuit shown in the adjoining figure, the reading of ammeter A is:
A `30muF` capacitor is charged by a constant current of 30 mA. If the capacitor is initially unchanged, how long does it take for the potential difference to reach 400 V:
Two object are rubbed against each other, the nature of electric force, when they are placed at some distance is:
A planet of mass m is moving in an elliptical orbit about the sum with time period T. If A be the area of orbit, then its angular momentum would be:
