Recent questions in 2014

In an ammeter 0.2% of main current passes through the galvanometer. If resistance of galvanometer is G, the resistance of ammeter will be:

asked Aug 20, 2018 by pady_1

1 answer

Following figures show the arrangement of bar magnets in different configurations. Each magnet has magnetic dipole $\overrightarrow{m}$ . Which configuration has highest net magnetic dipole moment?

asked Aug 20, 2018 by pady_1

1 answer

A potentiometer circuit has been set up for finding the internal resistance of a given cell. The main battery, used across the potentiometer wire, has an emf of 2.0 V and a negligible internal resistance. The potentiometer wire itself is 4 m long. When the resistance, R, connected acrose the given cell, has values of. (i) infinity $\; \; \; \; \; \; $ (ii) 9.5 Q The 'balancing lengths, on the potentiometer wire are found to be 3m and 2.85 m, respectively. The value of internal resistance of the cell is:

asked Aug 20, 2018 by pady_1

1 answer

The resistance in the two arms of the meter bridge are 5 $\Omega$ and R $\Omega$ , respectively. When the resistance R is shunted with an equal resistance, the new balance point is at $1.6 \ell_1$ . The resistance 'R' is :

asked Aug 20, 2018 by pady_1

1 answer

Two cities are 150 km apart. Electric power is sent from one city to another city through copper wires. The fall of potential per km is 8 volt and the average resistance per km is 0.5 $\Omega$ The power loss in the wire is:

asked Aug 20, 2018 by pady_1

1 answer

In a region the potential is represented by V(x, y, z) = 6x - 8xy - 8y + 6yz, where Vis in volts and x, y, z, are in meters. The electric force experienced by a charge of 2 coulomb situated at point (1, 1,1) is :

asked Aug 20, 2018 by pady_1

1 answer

A conducting sphere of radius R is given a charge Q. The electric potential and the electric field at the centre of the sphere respectively are:

asked Aug 20, 2018 by pady_1

2 answers

Two thin dielectric slabs of dielectric constants $K_1$ and $K_2 ( K_1 < K_2)$ are inserted between plates of a parallel plate capacitor, as shown in the figure. The variation of electric field 'E' between the plates with distance 'd' as measured from plate P is correctly shown by:

asked Aug 20, 2018 by pady_1

1 answer

A speeding motorcyclist sees traffic jam ahead of him. He slows down to 36km/hour. He finds that traffic has eased and a car moving ahead of him at 18 km/hour is honking at a frequency of 1392 Hz. If the speed of sound is 343 m/s, the frequency of the honk as heard by him will be:

asked Aug 20, 2018 by pady_1

1 answer

The number of possible natural oscillations of air column in a pipe closed at one end of length 85 cm whose frequencies lies below 1250 Hz are: (velocity of sound = $340 \;ms^{-1}$)

asked Aug 20, 2018 by pady_1

1 answer

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

1 answer

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

asked Aug 20, 2018 by pady_1

1 answer

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

1 answer

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

1 answer

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

1 answer

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

1 answer

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

1 answer

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

1 answer

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

1 answer

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

1 answer

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

1 answer

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

1 answer

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

1 answer

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

1 answer

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

1 answer

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

1 answer

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

1 answer

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

1 answer

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

If force (F), velocity(V) and time (T) are taken as fundamental units, the dimensions of mass are

asked Aug 20, 2018 by pady_1

1 answer

Ask Questions, Get Answers

In an ammeter 0.2% of main current passes through the galvanometer. If resistance of galvanometer is G, the resistance of ammeter will be:

Following figures show the arrangement of bar magnets in different configurations. Each magnet has magnetic dipole $\overrightarrow{m}$ . Which configuration has highest net magnetic dipole moment?

The resistance in the two arms of the meter bridge are 5 $\Omega$ and R $\Omega$ , respectively. When the resistance R is shunted with an equal resistance, the new balance point is at $1.6 \ell_1$ . The resistance 'R' is : <br>

Two cities are 150 km apart. Electric power is sent from one city to another city through copper wires. The fall of potential per km is 8 volt and the average resistance per km is 0.5 $\Omega$ The power loss in the wire is:

In a region the potential is represented by V(x, y, z) = 6x - 8xy - 8y + 6yz, where Vis in volts and x, y, z, are in meters. The electric force experienced by a charge of 2 coulomb situated at point (1, 1,1) is :

A conducting sphere of radius R is given a charge Q. The electric potential and the electric field at the centre of the sphere respectively are:

Two thin dielectric slabs of dielectric constants $K_1$ and $K_2 ( K_1 < K_2)$ are inserted between plates of a parallel plate capacitor, as shown in the figure. The variation of electric field 'E' between the plates with distance 'd' as measured from plate P is correctly shown by: <br>

A speeding motorcyclist sees traffic jam ahead of him. He slows down to 36km/hour. He finds that traffic has eased and a car moving ahead of him at 18 km/hour is honking at a frequency of 1392 Hz. If the speed of sound is 343 m/s, the frequency of the honk as heard by him will be:

The number of possible natural oscillations of air column in a pipe closed at one end of length 85 cm whose frequencies lies below 1250 Hz are: (velocity of sound = $340 \;ms^{-1}$)

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:

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

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

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 $\gamma = 5/3$)

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;

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: <br> [Take specific heat of water = $1 \; cal\; g^{-10} C^{-1}$ and latent heat of steam = $540 \;cal \;g^{–1} $]

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:

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 ?

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

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 ?

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 :

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 $s^{–2}$

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 :

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' ?

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 : <br>

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:

If force (F), velocity(V) and time (T) are taken as fundamental units, the dimensions of mass are