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Recent questions tagged physics
Questions
A heat engine operates between a cold reservoir at temperature $\;T_{2}=600 K\;$ & a hot reservoir at temperature $\;T_{1}\;.$ It takes 1000 J of energy from hot reservoir & gives 200 J . What can be the minimum temperature of the hot reservoir
jeemain
physics
class11
cbse
thermodynamics
medium
asked
Mar 12, 2014
by
yamini.v
1
answer
A heat engine operates between a cold reservoir at temperature $\;T_{1}=300 K\;$ & a hot reservoir at temperature $\;T_{2}=600 K\;$ . It takes 500 J heat from hot reservoir and delivers x J of heat to cold reservoir in a cycle . Then x = ?
jeemain
physics
class11
cbse
thermodynamics
easy
asked
Mar 12, 2014
by
yamini.v
1
answer
An engine intakes 10 g of steam per sec at $\;100^{0}C\;$ & cools it down to $\;50^{0}C\;$. ( latent heat of vapourization of steam = 540 $\;calg^{-1}$) Heat rejected by engine per minute
jeemain
physics
class11
cbse
thermodynamics
easy
asked
Mar 12, 2014
by
yamini.v
1
answer
An ideal gas is made to expand isothermally from $\;V_{1}\;$ to $\;V_{2}\;$ & is then compressed adiabatically to $\;V_{1}\;$ . Then the total work done is -
jeemain
physics
class11
cbse
thermodynamics
medium
asked
Mar 12, 2014
by
yamini.v
1
answer
A ball is dropped from a height of $10\; m$ & it rises to a height of $5\; m$ . Assuming $\;50 \%\;$ of the energy goes into increasing temperature of ball , the temperature rise is (specific heat of ball's material = $\;1000 JK^{-1}$)
jeemain
physics
class11
cbse
thermodynamics
easy
asked
Mar 12, 2014
by
yamini.v
1
answer
If heat is supplied to a solid , its temperature -
jeemain
physics
class11
cbse
thermodynamics
easy
asked
Mar 12, 2014
by
yamini.v
1
answer
Two balls of equal masses moving with $\;10 \;ms^{-1}\;$ towards each other collide after some time . Considering the collision to be inelastic & mass of each ball to be 1 kg , the thermal energy developed in the process is equal to what?
jeemain
physics
class11
cbse
thermodynamics
easy
mock
asked
Mar 12, 2014
by
yamini.v
1
answer
A vehicle (mass=1000 kg) , moving at a speed of $\;36 \;kmh^{-1}\;$ is stopped in 2 s . Assuming that $\;50 \%\;$ of the mechanical energy lost appears as thermal energy , the average rate of production of thermal energy in $\;cal s^{-1}\;$ is -
jeemain
physics
class11
cbse
thermodynamics
easy
asked
Mar 12, 2014
by
yamini.v
1
answer
When a hot liquid sample is mixed with a cold one , the temperature of the mixture
jeemain
physics
class11
cbse
thermodynamics
difficult
asked
Mar 12, 2014
by
yamini.v
1
answer
A calorimeter (water equivalent = 25 g ) contains of 265 g of water at $\;30^{0}C\;$ . Steam is passed at $\;100^{0}C\;$ is passed which increases the temperature to $\;40^{0}C\;$ & the mass of the calorimeter and its contents by 2g . Given that the specific heat capacity of water is $\;1\;{calg^{-1}}^{0}C\;$ , the latent heat of vapourization of water is -
jeemain
physics
class11
cbse
thermodynamics
difficult
asked
Mar 12, 2014
by
yamini.v
1
answer
A bullet is fired into a box & penetrates it . The penetration process melts it . Assuming that $\;25 \%\;$ of its K.E . goes in heating & the initial and final temperature are $\;27^{0}C\;$ & $\;327^{0}C\;$, the initial velocity is - (specific heat capacity = $\;100 Jkg^{-1}K^{-1}\;$ Latent heat of fusion = $\;2 \times 10^{4} Jkg^{-1}$)
jeemain
physics
class11
cbse
thermodynamics
difficult
asked
Mar 12, 2014
by
yamini.v
1
answer
A ball is dropped from a height of 1000 Km .Due to heat from air friction & melts just before reaching the ground . The latent heat of fusion of ball's material is - (specific heat of material =100 $\;{J kg^{-1}}^{0}C$ Air tempeature=$\;25^{0}C\;$ , Melting point =$\;{J kg^{-1}}^{0}C\;$)
jeemain
physics
class11
cbse
thermodynamics
difficult
asked
Mar 12, 2014
by
yamini.v
1
answer
The mechanical equivalent of heat -
jeemain
physics
class11
cbse
thermodynamics
easy
asked
Mar 12, 2014
by
yamini.v
1
answer
As the temperature increases , the time period of the pendulum -
jeemain
physics
class11
cbse
thermodynamics
easy
asked
Mar 12, 2014
by
yamini.v
1
answer
A circular coil of area $0.04 m^2$, 200 turns and resistance 2 $\Omega$ changes from $0.1 \;Wb \;m^{−2}$ to $0.04 \;Wb\; m^{−2}$ in $0.02 \text{seconds}$. Find the induced emf.
jeemain
physics
cbse
class12
ch6
easy
electromagnetic-induction
faradays-law
asked
Mar 12, 2014
by
balaji.thirumalai
1
answer
From a rectangular box , a circular portion is removed and the figure looks like - when the object is heated , the distance PQ -
jeemain
physics
class11
cbse
thermodynamics
difficult
asked
Mar 12, 2014
by
yamini.v
1
answer
Ram is pedaling his bicylce down a road, perpendicular to the Earth's magnetic field of $5.5 \times 10^{-5} T$. His Wheel has an area of $1.2 m^2$. What is the flux through the metal rim of his bicycle wheel?
jeemain
physics
electromagnetic-induction
cbse
class12
ch6
easy
ac-generator
asked
Mar 12, 2014
by
balaji.thirumalai
1
answer
A pendulum clock is made of iron rod $\;(\alpha_{iron}={10^{-5}}^{0}C^{-1})\;.$ At room temperature $\;(15^{0}C)\;,$ it works correctly . The error when the temperature rises to $\;24^{0}C\;$
jeemain
physics
class11
cbse
thermodynamics
medium
asked
Mar 12, 2014
by
yamini.v
1
answer
A pendulum clock having copper rod keeps correct at $\;20^{0} C\;.$ It gains 15 seconds per day if cooled to $\;0^{0}C\;.$ Calculate the coefficient of linear expansion of copper :
jeemain
physics
class11
cbse
thermodynamics
medium
asked
Mar 12, 2014
by
yamini.v
1
answer
If ideal gas is taken through a process given by the graph below, identify which of the following options is incorrect:
jeemain
physics
kinetic-theory-of-gases
class11
ch13
behaviour-of-gases
ideal-gas-law
medium
asked
Mar 11, 2014
by
balaji.thirumalai
1
answer
If the plot of density $\rho$ versus temperature $T$ is as given below, identify which of the following statements is incorrect?
jeemain
physics
kinetic-theory-of-gases
class11
ch13
medium
molecular-nature-of-matter
behaviour-of-gases
ideal-gas-law
pressure-of-an-ideal-gas
asked
Mar 11, 2014
by
balaji.thirumalai
1
answer
Q Joules of Heat is given to a sample of Helium in such a manner that the pressure remains constant throughout. The work done by the gas is then?
jeemain
physics
kinetic-theory-of-gases
work-done
class11
ch13
difficult
kinetic-theory-of-an-ideal-gas
specific-heat-capacity
asked
Mar 11, 2014
by
balaji.thirumalai
1
answer
The equation of a state of gas is given by $PV = nRT + Pb$. If the gas is isothermally expanded from a volume $V$ to $2V$, what is the work done during the process?
jeemain
physics
kinetic-theory-of-gases
kinetic-theory-of-an-ideal-gas
isothermal-process
class11
ch13
difficult
asked
Mar 11, 2014
by
balaji.thirumalai
1
answer
The density of the gaseous mixture of Hydrogen and Carbon-di-Oxide is $\large\frac{30\;g}{22.4\;l}$ at NTP. What is the % composition of Hydrogen and Carbon-di-oxide by volume in the mixture respectively?
molecular-nature-of-matter
jeemain
physics
kinetic-theory-of-gases
class11
ch13
behaviour-of-gases
ideal-gas-law
difficult
asked
Mar 11, 2014
by
balaji.thirumalai
1
answer
A student while performing an experiment forgot to add the reaction mixture and started heating the open round bottom flask on the flame. If he found the temperature to be $227 ^{\circ} C$ after heating, which was $27 ^{\circ} C$ earlier, what fraction of air would have been expelled out?
jeemain
physics
kinetic-theory-of-gases
molecular-nature-of-matter
class11
ch13
behaviour-of-gases
ideal-gas-law
medium
asked
Mar 11, 2014
by
balaji.thirumalai
1
answer
A gaseous compound X contains 44.4% Carbon, 51.9% Nitrogen and 3.7% Hydrogen. Under like conditions, same volume of X as that of Hydrogen took 50 seconds to diffuse whereas Hydrogen took 9.62 seconds. What is the molecular formula of X?
jeemain
physics
kinetic-theory-of-gases
class11
ch13
medium
kinetic-theory-of-an-ideal-gas
rate-of-diffusion
difficult
asked
Mar 11, 2014
by
balaji.thirumalai
1
answer
Consider a gas in a container which is made air tight. Now, there is a movable piston fitted with the container. The gas performs some mechanical work on the piston by moving it. The reason the gas performs its work is because of which of the following?
jeemain
physics
kinetic-theory-of-gases
class11
ch13
easy
kinetic-theory-of-an-ideal-gas
speed-of-molecules
asked
Mar 11, 2014
by
balaji.thirumalai
1
answer
2 Moles of Oxygen is heated from $0 ^{\circ} C$ at constant pressure till its volume increases by $20%$. The specific heat of Oxygen is given to be $0.22$ cal$ \;g^{-1} K^{-1}$. What is the amount of heat required?
jeemain
physics
kinetic-theory-of-gases
specific-heat-capacity
molar-specific-heat
class11
ch13
medium
asked
Mar 11, 2014
by
balaji.thirumalai
1
answer
For an ideal gas, the following conversions are made:
jeemain
physics
kinetic-theory-of-gases
kinetic-theory-of-an-ideal-gas
adiabatic-process
class11
ch13
difficult
asked
Mar 11, 2014
by
balaji.thirumalai
1
answer
An ideal gas has a molar heat capacity pressure $C_p = 2.5 R$. The gas is kept in a closed volume of $0.083 m^3$ at a temperature of $300 ^{\circ}K$ and a pressure of $10^5 N/m^2$. $200J$ of heat is supplied to the gas. Calculate the final temperature and pressure of the gas.
jeemain
physics
kinetic-theory-of-gases
specific-heat-capacity
molar-specific-heat
class11
ch13
difficult
asked
Mar 11, 2014
by
balaji.thirumalai
1
answer
Two gases are sent through 2 ends of a 2m long pipe. If the gases reach at a distance of 1.5m from the end of the lighter gas, then what is the ratio of their masses (lighter: heavier), assuming pressure conditions to be the same?
jeemain
physics
kinetic-theory-of-gases
class11
ch13
medium
kinetic-theory-of-an-ideal-gas
rate-of-diffusion
asked
Mar 11, 2014
by
balaji.thirumalai
1
answer
In the figure below, $N_2$ and $H_2$ are sent into the metre pipe through the two ends. At what distance $x$ will Ammonia be formed.
jeemain
physics
kinetic-theory-of-gases
class11
ch13
medium
kinetic-theory-of-an-ideal-gas
mock
rate-of-diffusion
asked
Mar 11, 2014
by
balaji.thirumalai
1
answer
If N molecules of $O_2$ at $- 73^{\circ}$ possess the same kinetic energy as another sample of $H_2$ at $27^{\circ}$ then the number of molecules of $H_2$ is ?
kinetic-energy-of-ideal-gas
jeemain
physics
kinetic-theory-of-gases
class11
ch13
easy
asked
Mar 11, 2014
by
balaji.thirumalai
1
answer
What would be the most likely value for C$_T$, the molar heat capacity at constant temperature?
jeemain
physics
kinetic-theory-of-gases
specific-heat-capacity
molar-specific-heat
class11
ch13
easy
asked
Mar 11, 2014
by
balaji.thirumalai
1
answer
An open vessel containing 3 moles of an ideal gas at $ 300 ^{\circ}$ is heated to $ 500 ^{\circ}$. What is the number of moles left after heating?
molecular-nature-of-matter
jeemain
physics
kinetic-theory-of-gases
class11
ch13
behaviour-of-gases
ideal-gas-law
medium
asked
Mar 11, 2014
by
balaji.thirumalai
1
answer
When an open vessel is heated, which of the following holds true for the ideal gas inside the vessel?
jeemain
physics
kinetic-theory-of-gases
class11
ch13
kinetic-theory-of-an-ideal-gas
pressure-of-an-ideal-gas
behaviour-of-gases
ideal-gas-law
asked
Mar 11, 2014
by
balaji.thirumalai
1
answer
A proton is bombarded on a stationary lithium nucleus. As a result of collision two $\;\alpha\;$ particles are produced . If direction of motion of $\;\alpha \;$ particle with initial direction of motion makes an angle $\;cos^{-1}(\large\frac{1}{4})\;$ find kinetic energy of striking proton . Given binding energies per nucleon of $\;Li^{7}\;$ & $\;He^{4}\;$ are $5.60 MeV$ and $7.06 MeV$ respectively
jeemain
physics
class12
atoms-and-nuclei
difficult
asked
Mar 11, 2014
by
yamini.v
1
answer
The half life of $\;^{215}At\;$ is $\;200 \mu s\;$ . The time taken for radioactivity of a sample of $\;^{215}At\;$ to decay to $\;{\large\frac{1}{4}}^{th}\;$ of its initial value is
jeemain
physics
class11
ch13
nuclei
nuclear-physics
easy
radioactivity
half-life
alpha-beta-and-gamma-decay
asked
Mar 11, 2014
by
yamini.v
1
answer
Two wave pulse A & B are moving in opposite directions .along a taut string with a speed of 2.00 cm/sec . The amplitude of A is twice the amplitude of B . The pulse are shown in figure given at t=0 .Which is string shape of string at t=3 sec ?
jeemain
physics
class12
unit10
oscillations-and-waves
medium
asked
Mar 11, 2014
by
yamini.v
1
answer
The angular frequency 'w' of the system is
jeemain
physics
class12
unit10
oscillations-and-waves
medium
asked
Mar 11, 2014
by
yamini.v
1
answer
The equivalent spring constant of the system is
jeemain
physics
class12
unit10
oscillations-and-waves
medium
asked
Mar 11, 2014
by
yamini.v
1
answer
The equivalent spring constant for the system is
jeemain
physics
class12
unit10
oscillations-and-waves
medium
asked
Mar 11, 2014
by
yamini.v
1
answer
A light string of mass m and length L has its ends tied to two walls that are separated by the distance D. Two objects each of mass M are suspended from the string as shown in figure. if a wave pulse is sent from point A how long does it take to reach point B?
jeemain
physics
class12
unit10
oscillations-and-waves
difficult
asked
Mar 11, 2014
by
yamini.v
1
answer
A rid of length l and mass is fixed at point O as shown in the figure and it is free to rotate about that point . Find the frequency (w) for small angular oscillation
jeemain
physics
class12
unit10
oscillations-and-waves
difficult
asked
Mar 11, 2014
by
yamini.v
1
answer
If the per of human ear is 0.4 s and the minimum distance for an echo is 50 m . Then find the speed of sound in the medium
jeemain
physics
class12
unit10
oscillations-and-waves
difficult
asked
Mar 11, 2014
by
yamini.v
1
answer
Ram pedals a stationary bicycle whose pedals are attached to a 1000 turn coil of area 0.10 $m^2$. The coil rotates at half a revolution per second and it is placed in a uniform magnetic field of 0.01 T perpendicular to the axis of rotation of the coil. What is the maximum voltage generated in the coil?
jeemain
physics
electromagnetic-induction
cbse
class12
ch6
easy
ac-generator
asked
Mar 10, 2014
by
balaji.thirumalai
1
answer
A wheel with 10 metallic spokes each 0.3 m long is rotated with a speed of 120 rev/min in a plane normal to the horizontal component of earth’s magnetic field $H_E$ at a place. If $H_E$ = 0.4 G at the place, what is the induced emf between the axle and the rim of the wheel? Note that 1 G = $10^{–4}$ T.
cl31011
jeemain
physics
electromagnetic-induction
cbse
class12
ch6
easy
motional-electromotive-force
asked
Mar 10, 2014
by
balaji.thirumalai
1
answer
A light string with a mass per unit length of 8.00 g/m has its ends tied to two walls separated by distance equal to three - fourth the length of the string .An object of mass m is suspended from the center of the string , putting a tension in the string then transverse wave speed in the string as a function of hanging mass
jeemain
physics
class12
unit10
oscillations-and-waves
difficult
asked
Mar 10, 2014
by
yamini.v
1
answer
A wheel with 10 metallic spokes each 0.5 m long is rotated with a speed of 120 rev/min in a plane normal to the horizontal component of earth’s magnetic field $H_E$ at a place. If $H_E$ = 0.4 G at the place, what is the induced emf between the axle and the rim of the wheel? Note that 1 G = $10^{–4}$ T.
jeemain
physics
motional-electromotive-force
electromagnetic-induction
cbse
class12
ch6
easy
asked
Mar 10, 2014
by
balaji.thirumalai
1
answer
A metallic rod of 1 m length is rotated with a frequency of 100 rev/s, with one end hinged at the centre and the other end at the circumference of a circular metallic ring of radius 1 m, about an axis passing through the centre and perpendicular to the plane of the ring (see fig). A constant and uniform magnetic field of 1 T parallel to the axis is present everywhere. What is the emf between the centre and the metallic ring?
cl31007
jeemain
physics
motional-electromotive-force
electromagnetic-induction
cbse
class12
ch6
medium
asked
Mar 10, 2014
by
balaji.thirumalai
1
answer
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