Recently Active Physics Questions

Intensity and exact wavelength of the lines in the spectrum of an element depends upon ? a) temperature b) Pressure c) Pressure of Electric Field,magnetic field and motion of source d) None e) All ...

Sorry if this is silly, If sound travels faster in solids than in air then why on closing our ears we cannot hear the sound properly? ...

a test tube is taken with a volume V filled with water upto brim . it is slowly turned such that (if we consider that the test tube is rotated at +ive x axis starting from the tip of the base of test tube) at a particular ang ...

What to do and what not to do in the last month before IIT-JEE http://www.youtube.com/watch?v=Z5-AfiJxjOc&context=C4acfebbADvjVQa1PpcFMQX-FKsRHXxJDA7RTt_k4sN1NL6Iapsuo= ...

if perimeter of a quadrilateral is 4x then find the maximum value of the area of 3 triangles out of which 2 are identical such that the sum of the area of the triangle is not exceeding the area of the quardilateral .......... ...

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*Image* The figure shows mass m moves with velocity u. Ring is restricted to move on smooth fixed horizontal rod. Velocity of the ring at that moment? I thought the answer to be u/2 but the correct answer is 2u. This can happ ...

*Image* follow link given post #3 for image please give solutions... ...

*Image* For second, Options B,D are same. And those contain the answer I think For Third, Someone verify. I think it should be C ...

Q.Find the minimum radius of a planet of density rho temperature T which can retain oxygen in it's atmosphere.The mass of oxygen is M and the acceleration due to gravity is g m/s^2. Ans-:sqrt[(9RT)/8*G*m*rho*pie] here i get t ...

The shape of a water clock jar is such that water level. Descends at constant rate at all times.is it falls by x m/s,shape of jar is given by y proportional to x^n find value of n if radius of drain hole is r and can be assum ...

Which of these does not associates with a black body : a) It absorbs radiation b) It emits radiation c) It refracts radiation d) It reflects radiation. I don't remember the question correctly. So Excuse for the language. ...

1. A block A of mass m is placed over a plank B of mass 2m. The friction between them is .5 while the ground surface is smooth. The upper block A is imparted a velocity V towards right. The acceleration of B relative to A wil ...

*Image* *Image* The figure shows mass m moves with velocity u. Ring is restricted to move on smooth fixed horizontal rod. Velocity of the ring at that moment? I thought the answer to be u/2 but the correct answer is 2u. This ...

multi correct; in non uniform spherical shell of mass 'm' and radius R (here E is gravitational intensity) which of the following are wrong; (A) E = 0 (r<R) (B) ∫ E.dS = 0 on any closed surface inside the shell (C) E can ...

A point object moves on a circular path such that distance covered by it is given by S=t^2/2 +2t meter(t in seconds) .ratio of magnitude of acceleration at t=2 and t=5s is 1:2 .then radius of circle is? Ans 3√51 Please expl ...

a square loop PQRS of side 'L' is placed near an infinite current( i ) carrying wire in the same plane at a distance 'L'. now the loop is rotated about side PS by 90° . find the charge which passes through any point of the l ...

Q. A rod is placed tilted like a ladder is placed having its contact with ground as well as with the perpendicular wall. the rod is making an angle 37° with the horizontal. If the end touching the ground of the rod is being ...

in a hypothetical atom, potential energy beteen electron and proton at distance 'r' is given by ( -ke2/4r3 ) where k is constant . suppose bohr model is valid and n is principal quatum number , then total energy is proportion ...

Give the waveform of an AC Wave which has form factor less than 1 ? ...

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Three rods of identical cross-sectional area and made from the same metal form the sides of an isosceles triangle ABC, right angeled at B. The points A and B are maintained at temperatures T and (√2)T respectively. In stead ...

A uniform rod of length 27 m is rotating through one end through a fixed axis perpendicular to rod.ratio of angular and linear momentum? Options: 3,9,18,27 My answer is 9 but correct one is 18 which comes if we take MV=MWL/2 ...

if a particle covers half of distance with 30m/s. Then what should be the velocity of particle at other half distance,so that its average velocity will be 60m/s. ...

multi correct A neutron collides head on with a stationary hydrogen atom in ground state.Which of the following are correct( take mass of neutron ≈ hydrogen) A) if kinetic energy of neutron is less than 13.6 eV , collision ...

1. If nitrogen gas molecule goes straight up with its rms speed at 0°c from the surface of the earth and there are no collisions with other molecules, then it will rise to an approx. height of (a) 8 km (b) 12 km (c) 12 m (d) ...

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1) A spectroscopic instrument can differntiate 2 close wavelengths λ and λ+Δλ if λ/Δλ = 8000. The instrument is used to study spectral lines of balmer series of hydrogen. find approx how many lines are distinguished by ...

*Image* specifics ; radius = 5 cm u (coeff) = 0.8 ...

I.184 A chain AB of length l is located in a smooth horizontal tube so that its fraction of length h hangs freeely and toches the surface of the table with End B. At a certain moment the end A of the chain is set free. With w ...