Recent questions in 2013

A bar magnet of length â€˜lâ€™ and magnetic dipole moment â€˜Mâ€™ is bent in the form of an arc as shown in figure. The new magnetic dipole moment will be â€“

asked Aug 20, 2018 by pady_1

1 answer

A current loop in a magnetic field -

asked Aug 20, 2018 by pady_1

1 answer

When a proton is released from rest in a room, it starts with an initial acceleration $a_0$ towards west. When it is projected towards north with a speed $v_0$ it moves with an initial acceleration $3a_0$ toward west. The electric and magnetic fields in the room are -

asked Aug 20, 2018 by pady_1

1 answer

The resistances of the four arms P, Q, R and S in a Wheatstone’s bridge are 10 ohm, 30 ohm, 30 ohm and 90 ohm, respectively. The e.m.f. and internal resistance of the cell are 7 volt and 5 ohm respectively. If the galvanometer resistance is 50 ohm, the current drawn from the cell will be -

asked Aug 20, 2018 by pady_1

1 answer

The internal resistance of a 2.1 V cell which gives a current of 0.2A through a resistance of $10 \Omega$ is -

asked Aug 20, 2018 by pady_1

1 answer

A wire of resistance 4Ω is stretched to twice its original length. The resistance of stretched wire would be -

asked Aug 20, 2018 by pady_1

1 answer

A, B and C are three points in a uniform electric field. The electric potential is -

asked Aug 20, 2018 by pady_1

1 answer

Two pith balls carrying equal charges are suspended from a common point by strings of equal length, the equilibrium separation between them is r. Now the strings are rigidly clamped at half the height. The equilibrium separation between the balls now become -

asked Aug 20, 2018 by pady_1

1 answer

A source of unknown frequency gives 4 beats/s, when sounded with a source of known frequency 250 Hz. The second harmonic of the source of unknown frequency gives five beats per second, when sounded with a source of frequency 513 Hz. The unknown frequency is -

asked Aug 20, 2018 by pady_1

1 answer

It we study the vibration of a pipe open at both ends, then the following statement is not true -

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1 answer

A wave travelling in the +ve x-direction having displacement along y-direction as 1m, wavelength $2 \pi m$ and frequency of $\frac{1}{\pi}$ Hz is represented by :

asked Aug 20, 2018 by pady_1

1 answer

The amount of heat energy required to raise the temperature of 1 g of Helium at NTP, from $T_1 \; K$ to $T_2 \; K$ is :

asked Aug 20, 2018 by pady_1

1 answer

In the given $(V-T)$ diagram, what is the relation between pressures $P_1$ and $P_2$ ?

asked Aug 20, 2018 by pady_1

1 answer

During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its temperature. The ratio of $\frac{C_p}{C_v}$ for the gas is -

asked Aug 20, 2018 by pady_1

1 answer

A gas is taken through the cycle $A \to B \to C \to A$ , as shown. What is the net work done by the gas ?

asked Aug 20, 2018 by pady_1

1 answer

A piece of iron is heated in a flame. It first becomes dull red then becomes reddish yellow and finally turns to white hot. The correct explanation for the above observation is possible by using -

asked Aug 20, 2018 by pady_1

1 answer

The molar specific heats of an ideal gas at constant pressure and volume are denoted by $C_p$ and $C_v$ , respectively. If $\gamma = \frac{C_p}{C_v}$ and R is the universal gas constant, then $C_v$ is equal to -

asked Aug 20, 2018 by pady_1

1 answer

The wettability of a surface by a liquid depends primarily on -

asked Aug 20, 2018 by pady_1

1 answer

The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied ?

asked Aug 20, 2018 by pady_1

1 answer

Infinite number of bodies, each of mass 2 kg are situated on x-axis at distances 1m, 2m, 4m, 8m, … , respectively, from the origin. The resulting gravitational potential due to this system at the origin will be -

asked Aug 20, 2018 by pady_1

1 answer

A body of mass 'm' is taken from the earth's surface to the height equal to twice the radius (R) of the earth. The change in potential energy of body will be -

asked Aug 20, 2018 by pady_1

2 answers

A small object of uniform rolls up a curved surface with an initially velocity 'v'. It reaches upto a maximum height of $\frac{3v^2}{4g}$ with respect to the initial position. The object is -

asked Aug 20, 2018 by pady_1

1 answer

A rod PQ of mass M and length L is hinged at end P. The rod is kept horizontal by a massless string tied to point Q as shown in figure. When string is cut, the initial angular acceleration of the rod is -

asked Aug 20, 2018 by pady_1

1 answer

An explosion breaks a rock into three parts in a horizontal plane. Two of them go off at right angles to each other. The first part of mass 1 kg moves with a speed of $12 ms^{–1}$ and the second part of mass 2 kg moves with $8 ms^{–1}$ speed. If the third part files off with $4 ms^{–1}$ speed, then its mass is -

asked Aug 20, 2018 by pady_1

1 answer

A uniform force of $(3 \hat{i} + \hat {j})$ newton acts on a particle of mass 2 kg. Hence the particle is displaced from position $(2 \hat {i} + \hat{k})$ meter to position $(4 \hat{i} + 3 \hat{j} - \hat{k})$ meter. The work done by the force on the particle is -

asked Aug 20, 2018 by pady_1

1 answer

The upper half of an inclined plane of inclination θ is perfectly smooth while lower half is rough. A block starting from rest at the top of the plane will again come to rest at the bottom, if the coefficient of friction between the block and lower half of the plane is given by -

asked Aug 20, 2018 by pady_1

1 answer

Three blocks with masses m, 2m and 3m are connected by strings, as shown in the figure. After an upward force F is applied on block m, the masses move upward at constant speed v. What is the net force on the block of mass 2m ? (g is the acceleration due to gravity)

asked Aug 20, 2018 by pady_1

1 answer

A stone falls freely under gravity. It covers distances $h_1$ , $h_2$ and $h_3$ in the first 5 seconds, the next 5 seconds and the next 5 seconds respectively. The relation between $h_1$ , $h_2$ and $h_3$ is -

asked Aug 20, 2018 by pady_1

1 answer

The velocity of a projectile at the initial point A is $(2 \hat{i} + 3 \hat{j})$ m/s. It's velocity (in m/s) at point B is -

asked Aug 20, 2018 by pady_1

1 answer

In an experiment four quantities a, b, c and d are measured with percentage error 1%, 2%, 3% and 4% respectively. Quantity P is calculated as follows : $P = \frac{a^3b^2}{cd} . \%$ error in P is :

asked Aug 20, 2018 by pady_1

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Ask Questions, Get Answers

A bar magnet of length â€˜lâ€™ and magnetic dipole moment â€˜Mâ€™ is bent in the form of an arc as shown in figure. The new magnetic dipole moment will be â€“ <br>

A current loop in a magnetic field -

When a proton is released from rest in a room, it starts with an initial acceleration $a_0$ towards west. When it is projected towards north with a speed $v_0$ it moves with an initial acceleration $3a_0$ toward west. The electric and magnetic fields in the room are -

The resistances of the four arms P, Q, R and S in a Wheatstone’s bridge are 10 ohm, 30 ohm, 30 ohm and 90 ohm, respectively. The e.m.f. and internal resistance of the cell are 7 volt and 5 ohm respectively. If the galvanometer resistance is 50 ohm, the current drawn from the cell will be -

The internal resistance of a 2.1 V cell which gives a current of 0.2A through a resistance of $10 \Omega$ is -

A wire of resistance 4Ω is stretched to twice its original length. The resistance of stretched wire would be -

A, B and C are three points in a uniform electric field. The electric potential is - <br>

Two pith balls carrying equal charges are suspended from a common point by strings of equal length, the equilibrium separation between them is r. Now the strings are rigidly clamped at half the height. The equilibrium separation between the balls now become - <br>

A source of unknown frequency gives 4 beats/s, when sounded with a source of known frequency 250 Hz. The second harmonic of the source of unknown frequency gives five beats per second, when sounded with a source of frequency 513 Hz. The unknown frequency is -

It we study the vibration of a pipe open at both ends, then the following statement is not true -

A wave travelling in the +ve x-direction having displacement along y-direction as 1m, wavelength $2 \pi m$ and frequency of $\frac{1}{\pi}$ Hz is represented by :

The amount of heat energy required to raise the temperature of 1 g of Helium at NTP, from $T_1 \; K$ to $T_2 \; K$ is :

In the given $(V-T)$ diagram, what is the relation between pressures $P_1$ and $P_2$ ? <br>

During an adiabatic process, the pressure of a gas is found to be proportional to the cube of its temperature. The ratio of $\frac{C_p}{C_v}$ for the gas is -

A gas is taken through the cycle $A \to B \to C \to A$ , as shown. What is the net work done by the gas ? <br>

A piece of iron is heated in a flame. It first becomes dull red then becomes reddish yellow and finally turns to white hot. The correct explanation for the above observation is possible by using -

The molar specific heats of an ideal gas at constant pressure and volume are denoted by $C_p$ and $C_v$ , respectively. If $\gamma = \frac{C_p}{C_v}$ and R is the universal gas constant, then $C_v$ is equal to -

The wettability of a surface by a liquid depends primarily on -

The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied ?

Infinite number of bodies, each of mass 2 kg are situated on x-axis at distances 1m, 2m, 4m, 8m, … , respectively, from the origin. The resulting gravitational potential due to this system at the origin will be -

A body of mass 'm' is taken from the earth's surface to the height equal to twice the radius (R) of the earth. The change in potential energy of body will be -

A small object of uniform rolls up a curved surface with an initially velocity 'v'. It reaches upto a maximum height of $\frac{3v^2}{4g}$ with respect to the initial position. The object is -

A rod PQ of mass M and length L is hinged at end P. The rod is kept horizontal by a massless string tied to point Q as shown in figure. When string is cut, the initial angular acceleration of the rod is -

A uniform force of $(3 \hat{i} + \hat {j})$ newton acts on a particle of mass 2 kg. Hence the particle is displaced from position $(2 \hat {i} + \hat{k})$ meter to position $(4 \hat{i} + 3 \hat{j} - \hat{k})$ meter. The work done by the force on the particle is -

The upper half of an inclined plane of inclination θ is perfectly smooth while lower half is rough. A block starting from rest at the top of the plane will again come to rest at the bottom, if the coefficient of friction between the block and lower half of the plane is given by -

Three blocks with masses m, 2m and 3m are connected by strings, as shown in the figure. After an upward force F is applied on block m, the masses move upward at constant speed v. What is the net force on the block of mass 2m ? (g is the acceleration due to gravity) <br>

A stone falls freely under gravity. It covers distances $h_1$ , $h_2$ and $h_3$ in the first 5 seconds, the next 5 seconds and the next 5 seconds respectively. The relation between $h_1$ , $h_2$ and $h_3$ is -

The velocity of a projectile at the initial point A is $(2 \hat{i} + 3 \hat{j})$ m/s. It's velocity (in m/s) at point B is - <br>

In an experiment four quantities a, b, c and d are measured with percentage error 1%, 2%, 3% and 4% respectively. Quantity P is calculated as follows : $P = \frac{a^3b^2}{cd} . \%$ error in P is :