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Practice Online Test Series for JEE Main 2018 & NEET 2018
An ac source of angular frequency `omega` is fed across a resistor R and capacitor C in series. The current registered is I. Now the frequency is changed to `omega/3` (but maintaining the same voltage), then the current in circuit found to be halved. The ratio of reactance to resistance at original frequency `omega` is
In the circuit shown in figure `V_1,V_2,V_3`, and `V_4` voltmeters. If reading of `V_1 =2V`, reading of `V_2 = 4V,` reading of `V_3: = 8V` reading the `V_4` is
In the circuit shown in figure current in the branch BC is
In the circuit shown below R is varied from zero to a very large value. If P is power delivered by cell to the combination of resistances between X and Y. Then which of the following P - R graph is correct.
In the circuit shown figure, the value of R, for which one of two cells is in open circuit condition is
At t=0, is closed and it is found that `V_C=V_D` for all time t. Then `C_2` is
A potential difference of 30V is applied between ends of a conductor of length 100 m and resistance `0.5 Omega`. The conductor has uniform cross-section. The total linear momentum of free electrons is (mass of electron`=9.1xx10^(-31) kg, e = 1.6xx10^(-49) C)`
A capacitor of capacitance C containing air between its plates is charged by a cell of emf V. Keeping cell connected with plates a slab of dielectric constant K is introduced slowly to fill entire space between plates by an external agent. Then work done by external agent is
The circuit shown in figure contain three capacitors each of capacitance C. Capacitor 1 and 3 are initially charged and 2 is uncharged. Loss of electrostatic energy after switch S is closed and circuit settles, is
In X - Y plane an electrostatic field is given by `vecE=2hati+3hatj` v/m. Which of the following line represents line of constant potential?
Three point charges `+2Q, -Q, -Q` are placed at points `A(a, 0, 0), B(0, a, 0)` and `C(0, 0, a)` respectively. The total electric dipole moment `vecp`of the system of point charges is
Charge/volume `(rho)` varies with radial distance r from centre of a non-conducting charged sphere according to graph shown below then which of the following represents variation of magnitude of intensity `vecE`as a function of r. (R= radius of sphere).
. Figure represent a part of ring of radius R, carrying constant charged per unit length `lambda (lambda>0)`. If `vecE` is intensity of electric field of centre O then `vecE`is
A particle of mass m perform S.H.M on x-axis about x=0 with amplitude `A_0`. A damping force F=-bv is applied on the particle where v is velocity of particle of x-axis at any time t and b is constant. Amplitude of damped oscillation is `(b!=0)`.
A particle performs S.H.M on x-axis with potential energy (U) varying with position of particle on x-axis x according to `U=(20+x^2)` J where x is in m. If total mechanical energy of particle is 45J then amplitude of oscillation is
A satellite revolves round the earth. Air pressure inside the satellite is maintained at 76 cm of mercury. Height of mercury column, in a barometer tube 1 m long placed in the satellite, is
A large cylindrical tank has a hole of area A at its bottom. Water is poured in the tank by a tube of equal cross sectional area A ejecting water at the speed V. Then which of the following is correct.
Initial volume of water is 1000 c`m^3` at pressure `10^5` N/`m^2`. Pressure is increased to `10^6` N/`m^2`. If compressibility of water is `50xx10^(-11) m^2`/N then change in volume of water is
Two waves, of equal wave length and frequency having initial phase difference zero, travelling in same direction superimpose with each other at a point in space where path difference is `lambda/6 (lambda=` wavelength of each wave). If `4I_0` and `I_0` are intensity of two wave then intensity of resultant wave at the point of superposition is
A source emitting sound wave of frequency f is moving towards O with velocity `V_s=etav` where v is velocity of sound with respect to air. A detector D is at rest as shown in figure. Assume there is no wind the apparent frequency of sound wave for the detector, when source reaches O is.`(1>eta>0)`
