Recent questions tagged 2014

If $n_1$, $n_2$ and $n_3$ are the fundamental frequencies of three segments into which a string is divided, then the original fundamental frequency n of the string is given by:

asked Aug 20, 2018 by pady_1

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The mean free path of molecules of a gas (radius 'r') is inversely proportional to :

asked Aug 20, 2018 by pady_1

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A thermodynamics system undergoes cyclic process ABCDA as shown in Fig. The work done by the system in the cycle is:

asked Aug 20, 2018 by pady_1

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A mono atomic gas at a pressure P, having a volume V expands isothermally to a volume 2V and then adiabatically to a volume 16V. The final pressure of the gas is : (take $\gamma = 5/3$)

asked Aug 20, 2018 by pady_1

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Certain quantity of water cools from $70^°C$ to $60^°C$ in the first 5 minutes and to $54^°C$ in the next 5 minutes. The temperature of the surroundings is;

asked Aug 20, 2018 by pady_1

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Steam at $100^0 \;C$ is passed into 20g of water at $10^0 \;C$ When water acquires a temperature of $80^0 \;C$, the mass of water present will be: [Take specific heat of water = $1 \; cal\; g^{-10} C^{-1}$ and latent heat of steam = $540 \;cal \;g^{–1} $]

asked Aug 20, 2018 by pady_1

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A certain number of spherical drops of a liquid of radius 'r' coalesce to form a single drop of radius 'R' and volume 'V'. If 'T' is the surface tension of the liquid then:

asked Aug 20, 2018 by pady_1

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Copper of fixed volume 'V' is drawn into wire of length $'\lambda'$. When this wire is subjected to a constant force 'F', the extension produced in the wire is $'\Delta \ell'$ . Which of the following graph is a straight line ?

asked Aug 20, 2018 by pady_1

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Dependence of intensity of gravitational field (E) of earth with distance (r) from centre of earth is correctly represented by :

asked Aug 20, 2018 by pady_1

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A block hole is an object whose gravitational field is so strong that even light cannot escape from it. To what approximate radius would earth (mass = $5.98 \times 10^{24}\; kg$) have to be compressed to be a black hole ?

asked Aug 20, 2018 by pady_1

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The ratio of the acceleration for a solid sphere (mass 'm' and radius 'R') rolling down an incline of angle 'θ' without slipping and slipping down the incline without rolling is :

asked Aug 20, 2018 by pady_1

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A solid cylinder of mass 50 kg and radius 0.5 m is free to rotate about horizontal axis. A massless string is wound round the cylinder with one end attached to it and other hanging freely. Tension in the string required to produce an angular acceleration of 2 revolutions $s^{–2}$

asked Aug 20, 2018 by pady_1

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The oscillation of a body on a smooth horizonatal surface is represented by the equation, $X = A \cot (\omega t)$ where, $X$ = displacement at time $t$ $\omega$ = frequency of oscillation Which one of the following graph shows correctly the variation $'a'$ with $'t'$ ? Here a = acceleration at time t T = time period

asked Aug 20, 2018 by pady_1

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A body of mass (4m) is lying in x-y plane at rest. It suddenly explodes into three pieces. Two pieces each of mass (m) move perpendiculr to each other with equal speeds $(v)$. The total kinetic energy generated due to explosion is :

asked Aug 20, 2018 by pady_1

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A balloon with mass 'm' is descending down with an acceleration 'a' (where a < g). How much mass should be removed from it so that it starts moving up with an acceleration 'a' ?

asked Aug 20, 2018 by pady_1

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The force 'F' acting on a particle of mass 'm' is indicated by the force-time graph shown below. The change in momentum of the particle over the time interval from zero to 8 s is :

asked Aug 20, 2018 by pady_1

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A system consists of three masses $m_1, m_2$ and $m_3$ connected by a string passing over a pulley $P$. The mass $m_1$ hangs freely and $m_2$ and $m_3$ are on a rough horizontal table (the coefficient of friction= $\mu$). The pulley is frictionless and of negligible mass. The downward acceleration of mass $m_1$ is : (Assume $m_1 = m_2 = m_3 = m$)

asked Aug 20, 2018 by pady_1

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A particle is moving such that its position coordinates (x,y) are (2m, 3m) at time t= 0, (6m,7m) at time t= 2s and (13m, 14m) at time t= 5 s, Average velocity vector ($\overrightarrow{V}_{av}$) from t = 0 to t= 5 sis:

asked Aug 20, 2018 by pady_1

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A projectile is fired from the surface of the earth with a velocity of $5\;ms^{-1}$ and angle $\theta$ with the horizontal. Another projectile fired from another planet with a velocity of $3\;ms^{-1}$ at the same angle follows a trajectory which is identical with the trajectory of the projectile fired from the earth. The value of the acceleration due to gravity on the planet is : (given = $9.8 ms^{-2}$)

asked Aug 20, 2018 by pady_1

1 answer