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Questions >> JEEMAIN and NEET >> Physics

Physics

In an ac circuit with combination of L and C which one of following represents the variation of frequency f with reactance X?

asked Mar 25, 2014 by meena.p

1 answer

The ends of a metal rod of length 60 cm are showing the steady temperature $\;70^{0}C\;$ and $\;30^{0}C\;$ is the steady state . The temperature of the rod at a distance of 15 cm from hot end is

asked Mar 25, 2014 by yamini.v

1 answer

The equation of AC voltage is $E=220\; \sin (wt+\large\frac{\pi}{6})$ and AC current is $I= 10 \sin (wt+\large\frac{\pi}{6})$ The average power dissipated is

asked Mar 25, 2014 by meena.p

1 answer

A bulb is rated $100\;V,100\;W$ The inductance of an inductor that should be connected in series with the bulb to operate the bulb at rated power, with ac source $200 V, 50 \;Hz$

asked Mar 25, 2014 by meena.p

1 answer

Five rods of the same dimension are arranged as shown . AB are maintained at different temperatures . No Heat flows through the central rod ; then

asked Mar 25, 2014 by yamini.v

1 answer

Two metal rods have their thermal conductivities $\;K_{1}\;$ and $\;K_{2}\;$ in the ratio 3 : 2 so that their thermal resistance are the same . Then their lengths are is the ratio ( Area of C .S . are the same )

asked Mar 25, 2014 by yamini.v

1 answer

A square iron plate of side 3 cm and thickness 8 mm has its opposite faces at $\;100^{0}C\;$ and $\;60^{0}C\;$ . If K=0.16 C.G.S units , then the amount of heat flow through the rod is 1 minute is

asked Mar 25, 2014 by yamini.v

1 answer

An AC Source gives a voltage of $V= 20\; \cos \;(2000 \;t)$. It is connected in a circuit as shown. The voltmeter reading is

asked Mar 25, 2014 by meena.p

1 answer

In the given circuit what will be reading of voltmeter.

asked Mar 25, 2014 by meena.p

1 answer

For the series LCR circuit what is resonance frequency and amplitude.

asked Mar 25, 2014 by meena.p

1 answer

A LC circuit has a $10\;V,50\;Hz$ AC sources, A current of $1A$ flows in the circuit. The voltage leads by u phase angle of $\large\frac{\pi}{3}$ radians. The Value of resistance and inductive resistance are

asked Mar 25, 2014 by meena.p

1 answer

The temperature gradient in a rod 0.5 m long is 80 c/m . The temperature of the hot end of the rod is $\;30^{0}C\;$. Then the temperature of the cooler and is

asked Mar 24, 2014 by yamini.v

1 answer

A fully charge capacitor C either initial charge q is connected to a coil of self inductance. L at $t=0$ the time at which the energy is stored equally between electric and magnetic field is

asked Mar 24, 2014 by meena.p

1 answer

Brass at $\;30^{0}C\;$ is observed to be 1 m long when measured by a steel scale which is connect at $\;0^{0}C\;$ . Correct length of the brass of at $\;0^{0}C\;$ is $\;(\alpha_{steel}=12 \times 10^{-6}/^{0}C\;and \; \alpha_{brass}=18 \times 10^{-6}/^{0}C\;)$

asked Mar 24, 2014 by yamini.v

1 answer

A clock which keeps correct time at $\;20^{0}C\;$ . How many seconds will it gains or loss per day when the temperature falls to $\;0^{0}C\;$ ? ( Coefficient of linear expansion of brass = $\;12\times 10^{-6}/^{0}C\;$ )

asked Mar 24, 2014 by yamini.v

1 answer

A metal rod of resistance $20 \;\Omega$ is fixed along the diameter of a conducting ring of radius$0.1 m$ . A magnetic field of $B=50T$ acts perpendicular to the plane The ring rotates with an angular velocity of $w=20\;rad/s$ about its axis . An external resistance of $10 \;\Omega$ is connected across center and rim of the ring. What is current through the external resistance.

asked Mar 24, 2014 by meena.p

1 answer

An iron bar is heated from $\;0^{0}C\;$ to $\;50^{0}C\;$ . If $\;\gamma\;$ of iron = $\;2 \times 10^{12} \;dyne/cm^{2}\;$ and $\;\alpha\;$ of iron is $\;12 \times 10^{-6}/^{0}C\;$ . The stress developed in the rod if it is prevented from expanding is

asked Mar 24, 2014 by yamini.v

1 answer

A crystal has a coefficient of linear expansion $\;13\times 10^{-7}/^{0}C\;$ , $\;12 \times 10^{-7}/^{0}C\;$ and $\;10 \times 10^{-7}/^{0}C\;$ in three mutually perpendicular directions respectively . Then the coefficient of cubical expansion of the crystal is

asked Mar 24, 2014 by yamini.v

1 answer

In the circuit given the switch is closed at time $t=0$ What is the amount of charge passing through the battery in are time constant ?

asked Mar 24, 2014 by meena.p

1 answer

The coefficient of linear expansion of a rod changes from $\;\alpha_{1}\;$ to $\;\alpha_{2}\;$ from end to end for a length l of the rod . If the temperature changes from $\;0^{0}C\;$ to $\;t^{0}C\;$ , the change of length is

asked Mar 24, 2014 by yamini.v

1 answer

A glass bottle weighs 50 g 1040 g then filled with a liquid at $\;0^{0}C\;$ . When it is at $\;100^{0}C\;$ , 10 g of the liquid overflows . If $\;\gamma_{r}=2 \times 10^{-4}/^{0}C\;$ , find the coefficient of linear expansion of container .

asked Mar 24, 2014 by yamini.v

1 answer

Two identical tumblers are fully filled with water at a certain temperature . One of the tumbler is warmed up and the other cooled . But it is formed that water overflows from both the tumblers . The temperature at which they are fully filled is

asked Mar 24, 2014 by yamini.v

1 answer

The mercury column of height $\;0.8\;gm\;$ at $\;0^{0}C\;$ balances the mercury column of height $\;0.8144\;m\;$ at $\;100^{0}C\;$ . Calculate the coefficient of real expansion of mercury ?

asked Mar 24, 2014 by yamini.v

1 answer

When 52 g of liquid in a vessel is heated from $\;0^{0}C\;$ to $\;100^{0}C\;$ 2 g of liquid is expelled . If 104 g of liquid is taken in a vessel made of same matenal how much of liquid is expelled on heating from $\;0^{0}C\;$ to $\;100^{0}C\;$ ?

asked Mar 24, 2014 by yamini.v

1 answer

Coefficient of real expansion of mercury is $\;0.18\times 10^{-3}/^{0}C\;$ . If the density of mercury at $\;0^{0}C\;$ is $\;13.6\;gm/C.C\;$ , then is density at 473 K will be

asked Mar 24, 2014 by yamini.v

1 answer

On heating a liquid of efficient of cubical expansion ' r ' in a container having coefficient of cubical expansion $\;\large\frac{r}{3}\;$ , the level of liquid in the container will

asked Mar 24, 2014 by yamini.v

1 answer

A mercury thermometer is transferred from melting ice to hot liquid . The mercury rises $\;\large\frac{9}{10}\;$ of the distance between the lower fixed point and the upper fixed point . The temperature of the liquid is $\;^{0}C\;$ is

asked Mar 24, 2014 by yamini.v

1 answer

A thermometer which has upper fixed points and lower fixed points equal to $\;95^{0}\;$ and $\;5^{0}\;$ respectively , reads $\;59^{0}\;$. What is the temperature on the centigrade scale .

asked Mar 24, 2014 by yamini.v

1 answer

In the given circuit shown : $L= 200\;mH;$ Emp of battery $E= 12 V$ $R_1=R_2=2 \Omega$ the internal resistance of battrey is negligible . The potential drop across the inductance L after time t.

asked Mar 24, 2014 by meena.p

1 answer

A plane Electro magnetic wave of frequency $30\; MHZ$ travels in free space component of wave at a point $E= 6V/m$ along y direction . The magnetic field component B at this point would be

asked Mar 24, 2014 by meena.p

1 answer

A emf of 10V is applied in a circuit containing inductance L and resistance R. $L=5H$ and $R= 10 \;\Omega$ . The ratio of current at $t =\infty$ and $t= 1\;s$ in

asked Mar 24, 2014 by meena.p

1 answer

A coil of inductance $84\;mH$ and resistance $8 \Omega$ is connected to $12 V$ battery. The current in the coil is 1 A at approximately

asked Mar 24, 2014 by meena.p

1 answer

A uniformly would soleacidal (ie) of self inductance $8 \times 10^{-4}\;H$ and resistance $45\;L$ is broken into two identical coils. These colis are then connected in parallel across a battery of $10V$ of negligible resistance the time constant for this circuit is

asked Mar 24, 2014 by meena.p

1 answer

Suppose we are told that the acceleration $A$ of a particle moving with uniform speed $v$ in a circle of radius $r$ is proportional to some power of r, say $r^n$, and some power of v, say $v^m$. Which of the following is the simplest form of an equation for the acceleration?

asked Mar 23, 2014 by balaji.thirumalai

1 answer

A physical quantity $P$ is related to four observables $a,b,c$ and $d$ as follows $P=\large\frac{\large a^3b^2}{(\sqrt {cd})}$. The percentage error in measuring $a,b,c,d$ are $1 \%,3 \%,4 \%$ and $2 \%$ respectively. What is percentage error in calculation of $P$

asked Mar 23, 2014 by balaji.thirumalai

1 answer

Objects at rest on earth's surface move in circular paths with a period of 24 hours. What should be the length of the day so that such objects experience weightlessness, so that they are in "true orbit"

asked Mar 23, 2014 by balaji.thirumalai

1 answer

A roller coaster pictured below starts at point $A$ and speeds down a curved track with speed $u$. Assume that the friction between the roller coaster and the track is negligible even though it always stays in contact with the track. What is the speed of the roller coaster at point $B$?

asked Mar 22, 2014 by balaji.thirumalai

1 answer

Two identical ladders are arranged as shown in the figure, resting on a horizontal surface. Mass of each ladder is M and length L. A block of mass m hangs from the apex point P. If the system is in equilibrium, find direction and magnitude of friction force acting at A or B.

asked Mar 21, 2014 by balaji.thirumalai

1 answer

A inductor $(L= 50 \;mH)$ and resistor of $R =100\;\Omega$ and a battery , of emf 100 V is initially connected in series. Then the battery is short circuited , the current flowing 1 ms after the short circuit is

asked Mar 21, 2014 by meena.p

1 answer

A conducting circular loop is placed in a uniform field of $B=0.05\;T$ with its plane perpendicular to the loop. The radius of loop is made to shrink at constant rate of $0.5\;mm$ per second. The induced emf when radius is $2 \;cm$ is

asked Mar 21, 2014 by meena.p

1 answer

A current $I= 10 \sin (100 \pi t)$ ampere is passed in first coil which induces a maximum emf of $5 \pi$ volts in second coil. The mutual inductance M is

asked Mar 21, 2014 by meena.p

1 answer

A circular coil of radius $30\; cm$ and resistance $\pi^{2}\;Ohms$ is rotating in a uniform magnetic field $B=10^{-2}$. Axis of rotation is diameter of coil which is perpendicular to direction of B. If Coil rotates with $200\;rpm$ the current induced in coil is

asked Mar 21, 2014 by meena.p

1 answer

At what temperature is reading on kelvin scale be double that on the celsius scale

asked Mar 21, 2014 by yamini.v

1 answer

Normal body temperature is $\;98.4^{0}F\;.\;$ What is the corresponding reading on the celsius scale ?

asked Mar 21, 2014 by yamini.v

1 answer

A conducting rod AB of length 1 m is moving with uniform speed of $2\;m/s$ in a uniform magnetic field of 4T which is directed perpendicular to the plane of motion of the rod AB. A capacitor of capacity $C= 10\;\mu F$ is connected. The charge on the capacitor is

asked Mar 21, 2014 by meena.p

1 answer

The work done in process ABC (in atm litre)

asked Mar 21, 2014 by yamini.v

1 answer

A horizontal wire AB of length l is free to slide on a vertical conducting frame as shown. The wire has mass m and length l and resistance of circuit is R. The system is placed in a uniform magnetic field B directed perpendicular to the frame. The wire after falling a distance under the influence of gravity aquires a terminal speed equal to

asked Mar 21, 2014 by meena.p

1 answer

A conducting circular loop of radius a and resistance R is kept in a horizontal plane. A vertical time varying magnetic field $B=2t$ is switched on at $t=0$ Then the flow of charge per unit time from any section of coil is

asked Mar 21, 2014 by meena.p

1 answer

A gas is expanded from volume $\;V_{0}\;$ to $\;2V_{0}\;$ under three different processes . Process 1 is isobaric , process 2 is isothermal and process 3 is adiabatic . Let $\;\bigtriangleup u_{1}\;, \bigtriangleup u_{2}\;$ and $\;\bigtriangleup u_{3}\;$ be the change in internal energy of the gas in the three processes . Then :

asked Mar 21, 2014 by yamini.v

1 answer

A magnetic flux passing perpendicular to plane of a coil is varying according to the relation. $\phi =3t^2+2t+5$ milliwebers. the emf induced at $t=2 \;sec$ is :

asked Mar 21, 2014 by meena.p

1 answer

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