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Recent questions tagged physics
Questions
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
jeemain
physics
alternating-current
lc-oscillators
class12
ch7
medium
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
jeemain
physics
class11
cbse
thermodynamics
heat-transfer
easy
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
jeemain
physics
electromagnetic-inductance
lc-oscillator
class12
ch6medium
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 $\;(\alpha_{steel}=12 \times 10^{-6}/^{0}C\;and \; \alpha_{brass}=18 \times 10^{-6}/^{0}C\;)$
jeemain
physics
class11
cbse
thermodynamics
thermal-expansion
easy
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 = $\;12\times 10^{-6}/^{0}C\;$ )
jeemain
physics
class11
cbse
thermodynamics
thermal-expansion
easy
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.
jeemain
physics
electromagnetic-induction
motional-electromotive-force
class12
ch6difficult
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
jeemain
physics
class11
cbse
thermodynamics
thermal-expansion
easy
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
jeemain
physics
class11
cbse
thermodynamics
thermal-expansion
easy
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 ?
jeemain
physics
electromagnetic-induction
inductance
class12
ch6
difficult
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
jeemain
physics
class11
cbse
thermodynamics
thermal-expansion
easy
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 .
jeemain
physics
class11
cbse
thermodynamics
thermal-expansion
easy
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
jeemain
physics
class11
cbse
thermodynamics
thermal-expansion
easy
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 ?
jeemain
physics
class11
cbse
thermodynamics
thermal-expansion
easy
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 $\;100^{0}C\;$ ?
jeemain
physics
class11
cbse
thermodynamics
thermal-expansion
easy
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
jeemain
physics
class11
cbse
thermodynamics
thermal-expansion
easy
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
jeemain
physics
class11
cbse
thermodynamics
thermal-expansion
easy
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
jeemain
physics
class11
cbse
thermodynamics
thermometry
easy
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 .
jeemain
physics
class11
cbse
thermodynamics
thermometry
easy
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.
jeemain
physics
electromagnetic-induction
inductance
class12
ch6
medium
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
jeemain
physics
electromagnetic-waves
medium
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
jeemain
physics
electromagnetic-induction
inducatnce
class12
ch6
medium
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
jeemain
physics
electromagnetic-induction
inductance
class12
ch6
difficult
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
jeemain
physics
electromagnetic-induction
inductance
class12
ch6
medium
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?
jeemain
physics
class11
ch2
units-and-measurement
medium
dimensional-formulae-and-analysis
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 $P$
jeemain
physics
class11
ch2
units-and-measurement
medium
accuracy-precision-and-errors-in-measurement
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"
jeemain
physics
class11
unit6
gravitation
q17
medium
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 $B$?
jeemain
physics
work-power-energy
medium
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.
jeemain
physics
rotational-motion
difficult
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
jeemain
physics
electromagnetic-induction
inductance
class12
ch6
medium
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
jeemain
physics
electromagnetic-induction
faradays-law
class12
ch6
medium
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
jeemain
physics
electromagnetic-induction
inductance
class12
ch6
medium
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
jeemain
physics
electromagnetic-induction
magnetic-flux
class12
ch6
medium
asked
Mar 21, 2014
by
meena.p
1
answer
At what temperature is reading on kelvin scale be double that on the celsius scale
jeemain
physics
class11
cbse
thermodynamics
thermometry
easy
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 ?
jeemain
physics
class11
cbse
thermodynamics
thermometry
easy
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
jeemain
physics
electromagnetic-induction
motional-electromotive-force
class12
ch6
medium
asked
Mar 21, 2014
by
meena.p
1
answer
The work done in process ABC (in atm litre)
jeemain
physics
class11
cbse
thermodynamics
easy
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
jeemain
physics
electromagnetic-induction
motional-electromotive-force
class12
ch6
difficult
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
jeemain
physics
electromagnetic-induction
faradays-law
class12
ch6
medium
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 :
jeemain
physics
class11
cbse
thermodynamics
easy
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 :
jeemain
physics
electromagnetic-induction
easy
faradays-law
ch6
class12
asked
Mar 21, 2014
by
meena.p
1
answer
An aeroplane in which the distance between the tips of using is $50\;m$ is flying horizontally with speed of $360\;km/hr$ over a place where the vertical component of earth's magnetic field is $2.0 \times 10^{-4}\;Weber /m^{2}$ The potential difference between the tips of wings will be
jeemain
physics
electromagnetic-induction
motional-electromotive-force
ch6
medium
class12
asked
Mar 21, 2014
by
meena.p
1
answer
Work done by gas in cyclic process ABCDA .
jeemain
physics
class11
cbse
thermodynamics
easy
asked
Mar 21, 2014
by
yamini.v
1
answer
During an adiabatic process , the pressure of a gas is formed to be proportional to the cube of its absolute temperature the value of r for the gas is
jeemain
physics
class11
cbse
thermodynamics
easy
asked
Mar 21, 2014
by
yamini.v
1
answer
A diamotic gas is heated at constant pressure such that it performs 4 J of work . Find the heat supplied to the gas
jeemain
physics
class11
cbse
thermodynamics
easy
asked
Mar 21, 2014
by
yamini.v
1
answer
P - T graph of an ideal gas is shown . Density of the gas at A is ' d ' and then density of the gas at B is
jeemain
physics
class11
cbse
thermodynamics
easy
asked
Mar 21, 2014
by
yamini.v
1
answer
In a thermodynamic process 400 J of heat is given to a gas and 100 J of work is also done on set . Calculate the change in internal energy of the gas .
jeemain
physics
class11
cbse
thermodynamics
easy
asked
Mar 21, 2014
by
yamini.v
1
answer
The ratio of molar heat capacities in path 1 and path 2
jeemain
physics
class11
cbse
thermodynamics
easy
asked
Mar 21, 2014
by
yamini.v
1
answer
The internal energy of a system remains constant when it undergoes
jeemain
physics
class11
cbse
thermodynamics
easy
asked
Mar 21, 2014
by
yamini.v
1
answer
In P - V graph
jeemain
physics
class11
cbse
thermodynamics
easy
asked
Mar 21, 2014
by
yamini.v
1
answer
The work done in cyclic process is
jeemain
physics
class11
cbse
thermodynamics
easy
asked
Mar 21, 2014
by
yamini.v
1
answer
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