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Questions >> JEEMAIN and NEET >> Physics

Physics

A fermi is equivalent to

asked Jul 10, 2014 by meena.p

1 answer

Which of the following is not a unit of time

asked Jul 10, 2014 by meena.p

1 answer

The dimensional formula of magnetic flux is:

asked Jul 10, 2014 by balaji.thirumalai

1 answer

If E is the electric field intensity and $ \mu_0$ is the permeability of free space, then the quantity $\large\frac{E^2}{\mu_0}$ has the dimensions of

asked Jul 10, 2014 by balaji.thirumalai

1 answer

Light -year is a unit of

asked Jul 10, 2014 by meena.p

1 answer

One micron is equal to

asked Jul 10, 2014 by meena.p

1 answer

A particle starts from the position of rest under a constant acceleration. If travels a distance x in the first 10 seconds and distance y in the next 20 seconds . Then

asked Jul 10, 2014 by meena.p

1 answer

The greatest acceleration or deceleration that a train may have is $\alpha$ .The minimum time in which the train can get from one station to the next at a distance S is

asked Jul 10, 2014 by meena.p

1 answer

The front point of a train moving with constant acceleration crosses a signal post with velocity u and the end point of the train crosses the signal post with velocity v. With what velocity the middle point of the train crosses the signal post ?

asked Jul 10, 2014 by meena.p

1 answer

A car travels along straight road for the first half-time with a velocity $v_1$ and the second half-time with velocity $v_2$ The average velocity of cars is

asked Jul 10, 2014 by meena.p

1 answer

Given the two statements below, which of the following responses that follow the statements is correct?

asked May 12, 2014 by sreemathi.v

1 answer

Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:Internal energy of a gas must increase when temperature is increased}\\\text{Reason:Internal energy is a function of velocity of gas.}\end{array}$

asked May 12, 2014 by sreemathi.v

1 answer

Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:A substance existing in the gaseous state at a temperature below its critical temperature is called a vapour and can be liquified by the application of pressure done.Above the critical temperature liquefaction is not possible by compression of gas and it is called a gas}\\\text{Reason:A triple point is the pressure and temperature point for a substance where all its 3 states coexist.}\end{array}$

asked May 12, 2014 by sreemathi.v

1 answer

Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:The ratio }\large\frac{C_P}{C_V}\normalsize \text{ is more for helium than hydrogen.}\\\text{Reason:Atomic mass of helium is more than hydrogen.}\end{array}$

asked May 12, 2014 by sreemathi.v

1 answer

A tube sealed at both ends is 100cm long.It lies horizontally,the middle 0.1m containing mercury & 2 ends containing air at standard atmospheric pressure.If tube is turned to vertical position,what amount of mercury will be displaced?

asked May 12, 2014 by sreemathi.v

1 answer

An insulated container containing monoatomic gas of molar mass $m$ is moving with velocity $v_0$.If the container is suddenly stopped,find the change in temperature.

asked May 12, 2014 by sreemathi.v

1 answer

A box of $1m^3$ is filled with nitrogen at 1.5atm at 300K.The box has a hole of area $0.01mm^2$.How much time is required for pressure to reduce by 0.1atm.If pressure outside is 1atm

asked May 12, 2014 by sreemathi.v

1 answer

An air bubble is released from the bottom of a lake of depth 11m.The temperature at the bottom is $4^{\large\circ}C$ and that at the surface is $12^{\large\circ}C$.What is the ratio of bubble's radius at the surface and its radius at bottom?Assume density of heater is $100Kg/m^3$.Atmospheric pressure =$75$cm of Hg & density of mercury =$13600Kg/m^3$

asked May 12, 2014 by sreemathi.v

1 answer

A vertical cylinderical tank 1cm high has its top end closed by a tightly fitted frictionless piston of negligible weight.The air inside the cylinder is at an absolute pressure of 1atm.The piston is depressed by pouring mercury on it very slowly.How far will the piston before mercury spills on the top of cylinder?

asked May 12, 2014 by sreemathi.v

1 answer

A vessel A with a capacity $V_1=2lt$ contains gas at a pressure $P_1=2atm$ and a vessel B with a capacity of $V_2=4lt$ contains the same gas at a pressure of 1atm.The temperature is $0^{\large\circ}C$ in A & $27^{\large\circ}C$ in B.What will be the pressure in the vessels if they are connected by a tube?

asked May 12, 2014 by sreemathi.v

1 answer

A cubical box of side 1cm contains helium gas (atomic weight =4) at a pressure of $100N/s^2$.During an abservation time of 1sec,an atom travelling with a root mean square speed parallel to one of the edges of the cube was found to make 500 hits with the wall.Evaluate the temperature of the gas

asked May 12, 2014 by sreemathi.v

1 answer

Calculate the $V_{RMS}$ of organ atoms at room temperature $25^{\large\circ}$

asked May 12, 2014 by sreemathi.v

1 answer

At temperature T,N molecules of a gas A,each having mass m and at the same temperature,2N molecules of gas B each having mass 2m are filled in a container .$V_{RMS}$ of molecules of B is $V^2$ and $x$ component of $V_{RMS}$ of A is $\omega^2$.$\large\frac{\omega^2}{V^2}$ is

asked May 12, 2014 by sreemathi.v

1 answer

28gm of $N_2$ gas is contained in a flask at a pressure 10atm and at a temperature of $57^{\large\circ}$C.It is found that due to leakage in the flask,the pressure is reduced to half & temperature is reduced to $27^{\large\circ}$C.Quantity of $N_2$ leaked out

asked May 12, 2014 by sreemathi.v

1 answer

Which of the following curve represent ideal gas behaviour

asked May 12, 2014 by sreemathi.v

1 answer

Calculate the total degrees of freedom of /cc of hydrogen

asked May 12, 2014 by sreemathi.v

1 answer

A balloon has 5.0g mole of helium at $7^{\large\circ}C$.Calculate the total internal energy of the system

asked May 12, 2014 by sreemathi.v

1 answer

A vessel containing 1gm of oxygen at a pressure of 10atm a temperature of $47^{\large\circ}C$.It is found that because of a leak,the pressure drops to $\large\frac{5}{8}$th of its original value & temperature falls to 2x.Find the mass of oxygen that has leaked out.

asked May 12, 2014 by sreemathi.v

1 answer

What is the energy of the rotational motion of molecules contained in 1Kg of nitrogen at a temperature of $7^{\large\circ}C$

asked May 12, 2014 by sreemathi.v

1 answer

RMS speed of a monoatomic gas is increased by 2 times.If the process is done adiabatically then the ratio of initial volumes to final volume will be

asked May 12, 2014 by sreemathi.v

1 answer

N molecules of an ideal gas at temperature $T_1$ & pressure $P_1$ are contained in a closed box.If the molecules in the box get doubled,keeping total K.E same then if new pressure is $P_2$ & temperature is $T_2$ then

asked May 12, 2014 by sreemathi.v

1 answer

RMS velocity of $H_2$ at 300K is $1930m/s$.Rms velocity of $O_2$ at 1200K will be

asked May 12, 2014 by sreemathi.v

1 answer

The distance between gas molecules is doubled on constant temperature,then the pressure is

asked May 12, 2014 by sreemathi.v

1 answer

At constant pressure,hydrogen is having temperature of $327^{\large\circ}C$.Till what temperature is it to be cooled such that the rms velocity of its molecules becomes half of the earlier values

asked May 12, 2014 by sreemathi.v

1 answer

An oxygen storage tank has a capacity of $0.05m^3$.The gas pressure is 100atm.Determine the total K.E of gas.

asked May 12, 2014 by sreemathi.v

1 answer

If pressure and temperature of an ideal gas is doubled and volume is halved the number of molecules of gas:-

asked May 12, 2014 by sreemathi.v

1 answer

A water tank is constructed on the top of a building with what speed will the water come out of a tank 8m below the water level the tank?Assume steady flow and that the pressure above the water level is equal to $P_{atm}$.

asked May 12, 2014 by sreemathi.v

1 answer

The profile of a dam is an arc of a circle,the arc having a radius of 30m and subtending an angle of $60^{\large\circ}$ at the centre of curvature which lies in the water surfaces.Determine the load on the dam in N/m

asked May 12, 2014 by sreemathi.v

1 answer

A tank with vertical sides is square in plane with 3m long sides.The tank contains oil of relative density 0.9 to a depth of 2.0m which is floating on water a depth of 1.5m.Calculate the force on the walls.(Consider one wall of the tank).

asked May 12, 2014 by sreemathi.v

1 answer

A closed tank has an orifice $0.025m$ diameter in one of its vertical sides.The tank contains oil to a depth of 0.61m above the centre of the orifice and the pressure in the air space above oil is maintained at $13780N/m^2$ above atmospheric.What is the discharge from the orifile.(Coefficient of discharge of the orifice is 0.61 relative density of oil is 0.9)

asked May 12, 2014 by sreemathi.v

1 answer

The face of a dam is vertical to a depth of 17m below the water surface from slopes at $60^{\large\circ}$ to the vertical.If the depth of water is 7.5m.What is the $F_{resultant}$ on the whole face?

asked May 9, 2014 by sreemathi.v

1 answer

What height would a water barometer need to be to measure atmospheric pressure?

asked May 9, 2014 by sreemathi.v

1 answer

At what depth below the surface of oil,relative density 0.8,will produce a pressure of $120KN/m^2$?

asked May 9, 2014 by sreemathi.v

1 answer

What will the absolute pressure of water at depth 12m below the surface?$(\rho_{water}=1000Kg/m^3,P_{atm}=101KN/m^2)$

asked May 9, 2014 by sreemathi.v

1 answer

Water flows in a horizontal tube as shown in figure.The pressure of water changes by $600N/m^2$ between A and B where the areas of cross section are $30cm^2$ and $15cm^2$ respectively.Find the rate of flow of water through the tube

asked May 9, 2014 by sreemathi.v

1 answer

A metal piece of mass 160g lies in equlibrium inside a glass of $H_2O$.The piece touches the bottom of the glass at a small number of points.If the density of the metal is $8000Kg/m^3$.Find the normal force exerted by the bottom of the glass on the metal piece

asked May 9, 2014 by sreemathi.v

1 answer

The area of cross section of the wider tube shown in figure is $900cm^2$.If the boy standing on the piston weights 45Kg then difference in the levels of water in the two tubes are ($\rho_{water}=1000Kg/m^3)$

asked May 9, 2014 by sreemathi.v

1 answer

In a test experiment on a model aeroplane in a wind tunnel,the flow speeds on the upper and lower surfaces of the wing are $70ms^{-1}$ respectively.What is the lift on the wing if its area is $2.5m^2$?Take the density of air to be $1.3Kgm^{-3}$

asked May 9, 2014 by sreemathi.v

1 answer

A U-tube contains water and methylated spirit separated by mercury.The mercury columns in the two arms are in level with 10cm of water in one arm & 12.5cm of spirit in the other.What is specific gravity of spirit ?

asked May 9, 2014 by sreemathi.v

1 answer

In Milikan's oil drop experiment,what is the terminal speed of an uncharged drop of radius $2\times 10^{-5}m$ and density $1.2\times 10^3Kgm^{-3}$?Take the viscocity of air at the temperature of the experiment is $1.8\times 10^{-5}pas$.How much is the viscous force on the drop at the speed?Neglect byoyancy of the drop due to air.

asked May 9, 2014 by sreemathi.v

1 answer

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