50278 + Interview Questions in Physics Page 290 InterviewSolution

14451.	A cylinder is pulled on a horizontal floor without slipping by a string wrapped around it. If the string is pulled horizontally from the top with a velocity v/2, then centre of the cylinder moves with a velocity v(c) equal to- 1)v/4, 2)2v, 3)v/2, 4)zer
Answer» A cylinder is pulled on a horizontal floor without slipping by a string wrapped around it. If the string is pulled horizontally from the top with a velocity v/2, then centre of the cylinder moves with a velocity v(c) equal to- 1)v/4, 2)2v, 3)v/2, 4)zer

Discussion

14452.	Electric field strength due to a uniformly charge rod
Answer» Electric field strength due to a uniformly charge rod

Discussion

14453.	The acceleration due to gravity near the earth's surface is 9.8 m/s2, and the earth's radius is 6400 km. From this data, calculate the mass of the earth. [G=6.67×10−11 Nm2/kg2]
Answer» The acceleration due to gravity near the earth's surface is $9.8 {m/s}^{2}$ , and the earth's radius is $6400 km$ . From this data, calculate the mass of the earth. $[G = 6.67 \times 10^{- 11} {Nm}^{2} {/kg}^{2}]$

Discussion

14454.	A rigid diatomic ideal gas undergoes an adiabatic process at room temperature. The relation between temperature and volume for this process is TVx=constant , then x is:
Answer» A rigid diatomic ideal gas undergoes an adiabatic process at room temperature. The relation between temperature and volume for this process is $T V^{x} = constant$ , then $x$ is:

Discussion

14455.	The torque acting on a dipole of moment →P in an electric field →E is
Answer» The torque acting on a dipole of moment $\to P$ in an electric field $\to E$ is

Discussion

14456.	Which of the following is true corresponding to the image formed by a convex mirror for a real object?
Answer» Which of the following is true corresponding to the image formed by a convex mirror for a real object?

Discussion

14457.	at room temperature the rms speed of the molecule of a certain diatomic gas found to be 1920 m/s .the gas i
Answer» at room temperature the rms speed of the molecule of a certain diatomic gas found to be 1920 m/s .the gas i

Discussion

14458.	X-rays of a particular wavelength are used to irradiate sodium and copper surfaces in two separate experiments and stopping potentials are determined. The stopping potentials are (1) Equal in both cases (2)greater for sodium (3) greater for copper (4) infinitte in both case
Answer» X-rays of a particular wavelength are used to irradiate sodium and copper surfaces in two separate experiments and stopping potentials are determined. The stopping potentials are (1) Equal in both cases (2)greater for sodium (3) greater for copper (4) infinitte in both case

Discussion

14459.	Two spherical stars A and B emit blackbody radiation. The radius of A is 400 times that of B and A emits 104 times the power emitted from B. The ratio (λAλB) of their wavelengths λA and λB at which the peaks occur in their respective radiation curves is
Answer» Two spherical stars $A$ and $B$ emit blackbody radiation. The radius of $A$ is $400$ times that of $B$ and $A$ emits $10^{4}$ times the power emitted from $B$ . The ratio $(\frac{λ_{A}}{λ_{B}})$ of their wavelengths $λ_{A}$ and $λ_{B}$ at which the peaks occur in their respective radiation curves is

Discussion

14460.	Which of the following is most volatile? Options: NH3 , PH3 , AsH3 , SbH3
Answer» Which of the following is most volatile? Options: NH3 , PH3 , AsH3 , SbH3

Discussion

14461.	Two plane mirrors inclined at 45∘ to each other. If an object is placed between them, then the number of images formed will be-
Answer» Two plane mirrors inclined at $45^{\circ}$ to each other. If an object is placed between them, then the number of images formed will be-

Discussion

14462.	g. Choose the incorrect statement(1) Mass is the measure of inertia(2) Action12and Reaction pair cannotdistinguishedm s olcwier(3) In a circular motion centripetal foforce acts onthe body4) All of theseg ln the civen ficure a force of 24acts on
Answer» g. Choose the incorrect statement(1) Mass is the measure of inertia(2) Action12and Reaction pair cannotdistinguishedm s olcwier(3) In a circular motion centripetal foforce acts onthe body4) All of theseg ln the civen ficure a force of 24acts on

Discussion

14463.	When light of wavelength 300 nm (nanometer) falls on a photoelectric emitter, photoelectrons are liberated. For another emitter, however light of 600 nm wavelength is sufficient for creating photoemission. What is the ratio of the work functions of the two emitters
Answer» When light of wavelength 300 nm (nanometer) falls on a photoelectric emitter, photoelectrons are liberated. For another emitter, however light of 600 nm wavelength is sufficient for creating photoemission. What is the ratio of the work functions of the two emitters

Discussion

14464.	A circular loop of one turn carries a current of 5.00 A. If the magnetic field B at the centre is 0.200 mT, find the radius of the loop.
Answer» A circular loop of one turn carries a current of 5.00 A. If the magnetic field B at the centre is 0.200 mT, find the radius of the loop.

Discussion

14465.	how to find velocity of a graph
Answer» how to find velocity of a graph

Discussion

14466.	A ball of mass m, moving with a velocity v along X-axis, strikes another ball of mass 2m kept at rest. The first ball comes to rest after collision and the other breaks into two equal pieces. One of the pieces starts moving along Y-axis with a speed v1. What will be the velocity of the other piece?
Answer» A ball of mass m, moving with a velocity v along X-axis, strikes another ball of mass 2m kept at rest. The first ball comes to rest after collision and the other breaks into two equal pieces. One of the pieces starts moving along Y-axis with a speed $v_{1}$ . What will be the velocity of the other piece?

Discussion

14467.	The period of oscillation of a simple pendulum isT = 2l/g.L is about 15cm and is known to 1mm accuracy . The period of oscillation is about 1s. The time of100 oscillation is measured with a watch of 0.1s resolution. What is the accuracy indetermination of g?
Answer» The period of oscillation of a simple pendulum isT = 2l/g.L is about 15cm and is known to 1mm accuracy . The period of oscillation is about 1s. The time of100 oscillation is measured with a watch of 0.1s resolution. What is the accuracy indetermination of g?

Discussion

14468.	The maximum electric field intensity on the axis of a uniformly charged ring of charge q and radius R will be
Answer» The maximum electric field intensity on the axis of a uniformly charged ring of charge q and radius R will be

Discussion

14469.	There are two particles A and B in space moving with velocities respectively and initial position vectors respectively. The condition for the two particles to collide isOptions:Wrong Should have chosen
Answer» There are two particles A and B in space moving with velocities respectively and initial position vectors respectively. The condition for the two particles to collide is Options: Wrong Should have chosen

Discussion

14470.	A fixed thermally conducting cylinder has a radius R and height L0. The cylinder is open at its bottom and has a small hole at its top. A piston of mass M is held at a distance L from the top surface, as shown. The atmospheric pressure is P0. While the piston is at a distance 2L from the top, the hole at the top is sealed. The piston is then released, to a position where it can stay in equilibrium. In this condition, the distance of the piston from the top is
Answer» A fixed thermally conducting cylinder has a radius R and height $L_{0}$ . The cylinder is open at its bottom and has a small hole at its top. A piston of mass M is held at a distance L from the top surface, as shown. The atmospheric pressure is $P_{0}$ . While the piston is at a distance 2L from the top, the hole at the top is sealed. The piston is then released, to a position where it can stay in equilibrium. In this condition, the distance of the piston from the top is

14470.

A fixed thermally conducting cylinder has a radius R and height L0. The cylinder is open at its bottom and has a small hole at its top. A piston of mass M is held at a distance L from the top surface, as shown. The atmospheric pressure is P0. While the piston is at a distance 2L from the top, the hole at the top is sealed. The piston is then released, to a position where it can stay in equilibrium. In this condition, the distance of the piston from the top is

Answer»

A fixed thermally conducting cylinder has a radius R and height $L_{0}$ . The cylinder is open at its bottom and has a small hole at its top. A piston of mass M is held at a distance L from the top surface, as shown. The atmospheric pressure is $P_{0}$ .

While the piston is at a distance 2L from the top, the hole at the top is sealed. The piston is then released, to a position where it can stay in equilibrium. In this condition, the distance of the piston from the top is

Discussion

14471.	Difference in heights between the liquid columns in the vertical limbs of an accelerated U-tube as shown in the figure is: [Take g=10 m/s2]
Answer» Difference in heights between the liquid columns in the vertical limbs of an accelerated $U$ -tube as shown in the figure is: [Take $g = 10 {m/s}^{2}$ ]

Discussion

14472.	The dimensions of ab in the equation p=a−t2bx, where p is pressure, x is distance and t is time, are
Answer» The dimensions of $\frac{a}{b}$ in the equation $p = \frac{a - t^{2}}{b x}$ , where p is pressure, x is distance and t is time, are

Discussion

14473.	Water flows through a tapering horizontal tube of radii of cross section of the ends r1 and r2. The velocity of water at the points for the radius of cross section r1 is v1. Find the force imparted by the emerging water at the other end of the tube.
Answer» Water flows through a tapering horizontal tube of radii of cross section of the ends r₁ and r₂. The velocity of water at the points for the radius of cross section r₁ is v₁. Find the force imparted by the emerging water at the other end of the tube.

Discussion

14474.	A jar is filled with two non-mixing liquids 1 and 2 having densities s1 and s2 respectively. A solid ball, made of a material of density s3, is dropped in the jar. It comes to equilibrium in the position shown in the figure. Which of the following is true for s1,s2,s3?
Answer» A jar is filled with two non-mixing liquids 1 and 2 having densities $s_{1}$ and $s_{2}$ respectively. A solid ball, made of a material of density $s_{3}$ , is dropped in the jar. It comes to equilibrium in the position shown in the figure. Which of the following is true for $s_{1}, s_{2}, s_{3}$ ?

Discussion

14475.	ntA circular disc of moment of inertia I1 is rotating in a horizontal plane, about its symmetry axis, with a constant angular speed v1. Another disc of moment of inertiaI2 is dropped coaxially onto the rotating disc. Initially the second disc has zero angular speed. Eventually both the discs rotate with a constant angular speed v2. The energy lost by the initially rotating disc to friction is?n
Answer» ntA circular disc of moment of inertia I1 is rotating in a horizontal plane, about its symmetry axis, with a constant angular speed v1. Another disc of moment of inertiaI2 is dropped coaxially onto the rotating disc. Initially the second disc has zero angular speed. Eventually both the discs rotate with a constant angular speed v2. The energy lost by the initially rotating disc to friction is?n

Discussion

14476.	4×1023 tritium atoms are contained in a vessel. The half-life of decay of tritium nuclei is 12.3 y. Find (a) the activity of the sample, (b) the number of decays in the next 10 hours (c) the number of decays in the next 6.15 y.
Answer» $4 \times 10^{23}$ tritium atoms are contained in a vessel. The half-life of decay of tritium nuclei is 12.3 y. Find (a) the activity of the sample, (b) the number of decays in the next 10 hours (c) the number of decays in the next 6.15 y.

Discussion

14477.	If a simple pendulum is taken to a place where g decreases by 2%, then the time period
Answer» If a simple pendulum is taken to a place where g decreases by 2%, then the time period

Discussion

14478.	The maximum wavelength for photoelectric emission in tungsten is 230 nm. The wavelength of light which must be used in order that maximum KE of ejected photoelectrons is 1.5 eV, is1) 280 cm2) 210 cm3) 175 cm4) 180 cm
Answer» The maximum wavelength for photoelectric emission in tungsten is 230 nm. The wavelength of light which must be used in order that maximum KE of ejected photoelectrons is 1.5 eV, is 1) 280 cm 2) 210 cm 3) 175 cm 4) 180 cm

Discussion

14479.	A satellite is put in an orbit just above the earth's surface with a velocity √1.5 times the velocity for a circular orbit on surface of earth. Assuming that path of satellite is elliptical in nature. The maximum distance of the satellite from the surface of the earth is nR where R is radius of earth. Find n
Answer» A satellite is put in an orbit just above the earth's surface with a velocity $\sqrt{1.5}$ times the velocity for a circular orbit on surface of earth. Assuming that path of satellite is elliptical in nature. The maximum distance of the satellite from the surface of the earth is $n R$ where R is radius of earth. Find $n$

Discussion

14480.	Which of the given electronic level would allow the hydrogen atom to emit a maximum of three type of photon?
Answer» Which of the given electronic level would allow the hydrogen atom to emit a maximum of three type of photon?

Discussion

14481.	A stationary source emits sound of frequency 670 Hz. The sound is reflected by a car approaching the source with a speed of 2 m/s. The reflected signal is received by the source and superimposed with the original. What will be beat frequency of the resultant signal in Hz?(Given that the speed of sound in air is 340 m/s and the car reflects the sound at the frequency it has received)
Answer» A stationary source emits sound of frequency $670 Hz$ . The sound is reflected by a car approaching the source with a speed of $2 m/s$ . The reflected signal is received by the source and superimposed with the original. What will be beat frequency of the resultant signal in $Hz$ ? (Given that the speed of sound in air is $340 m/s$ and the car reflects the sound at the frequency it has received)

Discussion

14482.	Two racing cars of masses m1 and m2 are moving in circles of radii r1 and r2 respectively. Their speeds are such that each makes a complete circle in the same time t. The ratio of the angular speeds of the first to the second car is
Answer» Two racing cars of masses m1 and m2 are moving in circles of radii r1 and r2 respectively. Their speeds are such that each makes a complete circle in the same time t. The ratio of the angular speeds of the first to the second car is

Discussion

14483.	A metal rod AB of length 10x has its one end A in ice at 0∘C and the other end (B) in water at 100∘C. If a point P on the rod is maintained at 400∘C, then it is found that equal amounts of water and ice evaporate and melt per unit time. The latent heat of evaporation of water is 540cal g−1 and the latent heat of fusion of ice is 80cal g−1. If the point P is at a distance of λx from the end A, find the value of λ. (Neglect any heat loss to the surroundings)
Answer» A metal rod AB of length $10 x$ has its one end $A$ in ice at $0^{\circ} C$ and the other end (B) in water at $100^{\circ} C$ . If a point P on the rod is maintained at $400^{\circ} C$ , then it is found that equal amounts of water and ice evaporate and melt per unit time. The latent heat of evaporation of water is $540 {cal g}^{- 1}$ and the latent heat of fusion of ice is $80 {cal g}^{- 1}$ . If the point P is at a distance of $λ x$ from the end A, find the value of $λ$ . (Neglect any heat loss to the surroundings)

Discussion

14484.	a coil of induc†an ce l=50uh and resis†an ce 0.5ohm is connected to a battery of emf 5v. a resis†an ce of10 ohm is connected in parallel to the coil. now at the same ins†an t the connection of the battery is switched off. then the amount of heat generated in the coil
Answer» a coil of induc†an ce l=50uh and resis†an ce 0.5ohm is connected to a battery of emf 5v. a resis†an ce of10 ohm is connected in parallel to the coil. now at the same ins†an t the connection of the battery is switched off. then the amount of heat generated in the coil

Discussion

14485.	A horizontal metallic rod of mass m and length l is supported by two vertical identical springs of spring constant K each and natural lengths l0. A current i is flowing in the rod in the direction shown. If the rod is in equilibrium, then the length of each spring in this state is-
Answer» A horizontal metallic rod of mass $m$ and length $l$ is supported by two vertical identical springs of spring constant $K$ each and natural lengths $l_{0}$ . A current $i$ is flowing in the rod in the direction shown. If the rod is in equilibrium, then the length of each spring in this state is-

Discussion

14486.	In the following circuit diagram fig. the lengths of the wires AB and BC are same but the radius of AB is three times that of BC. The ratio of potential gradients at AB and BC will be
Answer» In the following circuit diagram fig. the lengths of the wires AB and BC are same but the radius of AB is three times that of BC. The ratio of potential gradients at AB and BC will be

Discussion

14487.	It is written that maximum kinetic energy of photo electron and frequency of incident radiation are having linear relationship. How?
Answer» It is written that maximum kinetic energy of photo electron and frequency of incident radiation are having linear relationship. How?

Discussion

14488.	In the given circuit taking potential at point B as zero, find the potential of point Q.
Answer» In the given circuit taking potential at point $B$ as zero, find the potential of point $Q$ .

Discussion

14489.	For the wave shown in the figure, write the equation of the wave if its position is shown at t=0 speed of wave is 200 m/s.
Answer» For the wave shown in the figure, write the equation of the wave if its position is shown at $t = 0$ speed of wave is 200 m/s.

Discussion

14490.	The square loop in the figure has sides of length 20 cm. It has 5 turns and carries a current of 2 A. The normal to the loop is at 37∘ to a uniform field, B=0.5^j T. Find the work needed to rotate the loop from its position of minimum energy to the given orientation.
Answer» The square loop in the figure has sides of length $20 cm$ . It has $5$ turns and carries a current of $2 A$ . The normal to the loop is at $37^{\circ}$ to a uniform field, $B = 0.5^j T$ . Find the work needed to rotate the loop from its position of minimum energy to the given orientation.

Discussion

14491.	What is the typical length (in cm) of an acoustic guitar for it to have a natural frequency of 165 Hz and an approximate tension to linear density ratio of 19600 Nm kg−1?42.4
Answer» What is the typical length (in $cm$ ) of an acoustic guitar for it to have a natural frequency of $165 Hz$ and an approximate tension to linear density ratio of $19600 {Nm kg}^{- 1}$ ? 42.4

Discussion

14492.	Calculate the efficiency of a Carnot engine working between boiling point and freezing point of water.
Answer» Calculate the efficiency of a Carnot engine working between boiling point and freezing point of water.

Discussion

14493.	A block of mass 2 kg is placed on the top of a bigger block of mass 10 kg as shown in figure. The system is released from rest. Assume all the surfaces are frictionless. Find the distance moved by the bigger block at the instant when the smaller block reaches the ground.
Answer» A block of mass $2 kg$ is placed on the top of a bigger block of mass $10 kg$ as shown in figure. The system is released from rest. Assume all the surfaces are frictionless. Find the distance moved by the bigger block at the instant when the smaller block reaches the ground.

Discussion

14494.	Anelectric dipole with dipole moment 4 × 10−9C m is aligned at 30° with the direction of a uniform electricfield of magnitude 5 × 104N C−1.Calculate the magnitude of the torque acting on the dipole.
Answer» An electric dipole with dipole moment 4 × 10⁻⁹ C m is aligned at 30° with the direction of a uniform electric field of magnitude 5 × 10⁴ N C⁻¹. Calculate the magnitude of the torque acting on the dipole.

Discussion

14495.	If the wavefront AB is incident on the surface as shown, which among the following options show the reflected wavefront ?
Answer» If the wavefront $AB$ is incident on the surface as shown, which among the following options show the reflected wavefront ?

Discussion

14496.	In a compound microscope the focal length of an objective lens is 1.2 cm and the focal length of the eye piece is 3 cm. When the object is kept at 1.25 cm in front of the objective lens, the final image is formed at infinity. Magnifying power of the compound microscope should be:
Answer» In a compound microscope the focal length of an objective lens is $1.2 cm$ and the focal length of the eye piece is $3 cm$ . When the object is kept at $1.25 cm$ in front of the objective lens, the final image is formed at infinity. Magnifying power of the compound microscope should be:

Discussion

14497.	The emf of the cell is 2.5 V. On connecting a 24 ohm resistance across the cell, the terminal potential difference falls to 2.4 V. The internal resistance of the cell is
Answer» The emf of the cell is 2.5 V. On connecting a 24 ohm resistance across the cell, the terminal potential difference falls to 2.4 V. The internal resistance of the cell is

Discussion

14498.	A hollow tilted cylindrical vessel of negligible mass rests on a horizontal plane as known. The diameter of the base is a and the side of the cylinder makes an angle q with the horizontal. Water is then slowly poured into the cylinder. The cylinder topples over when the water reaches a certain height h, given by.
Answer» A hollow tilted cylindrical vessel of negligible mass rests on a horizontal plane as known. The diameter of the base is a and the side of the cylinder makes an angle q with the horizontal. Water is then slowly poured into the cylinder. The cylinder topples over when the water reaches a certain height h, given by.

14498.

A hollow tilted cylindrical vessel of negligible mass rests on a horizontal plane as known. The diameter of the base is a and the side of the cylinder makes an angle q with the horizontal. Water is then slowly poured into the cylinder. The cylinder topples over when the water reaches a certain height h, given by.

Answer»

A hollow tilted cylindrical vessel of negligible mass rests on a horizontal plane as known. The diameter of the base is a and the side of the cylinder makes an angle q with the horizontal. Water is then slowly poured into the cylinder. The cylinder topples over when the water reaches a certain height h, given by.

Discussion

14499.	A block of mass 25 kg is raised by a 50 kg man in two different ways as shown in Fig. 5.19. What is the action on the floor by the man in the two cases? If the floor yields to a normal force of 700 N, which mode should the man adopt to lift the block without the floor yielding?
Answer» A block of mass 25 kg is raised by a 50 kg man in two different ways as shown in Fig. 5.19. What is the action on the floor by the man in the two cases? If the floor yields to a normal force of 700 N, which mode should the man adopt to lift the block without the floor yielding?

14499.

A block of mass 25 kg is raised by a 50 kg man in two different ways as shown in Fig. 5.19. What is the action on the floor by the man in the two cases? If the floor yields to a normal force of 700 N, which mode should the man adopt to lift the block without the floor yielding?

Answer»

A block of mass 25 kg is raised by a 50 kg man in two different ways as shown in Fig. 5.19. What is the action on the floor by the man in the two cases? If the floor yields to a normal force of 700 N, which mode should the man adopt to lift the block without the floor yielding?

Discussion

14500.	What is the physical significance of partial differentiation
Answer» What is the physical significance of partial differentiation

Discussion

Explore topic-wise InterviewSolutions in .

A cylinder is pulled on a horizontal floor without slipping by a string wrapped around it. If the string is pulled horizontally from the top with a velocity v/2, then centre of the cylinder moves with a velocity v(c) equal to- 1)v/4, 2)2v, 3)v/2, 4)zer

Electric field strength due to a uniformly charge rod

The acceleration due to gravity near the earth's surface is 9.8 m/s2, and the earth's radius is 6400 km. From this data, calculate the mass of the earth. [G=6.67×10−11 Nm2/kg2]

A rigid diatomic ideal gas undergoes an adiabatic process at room temperature. The relation between temperature and volume for this process is TVx=constant , then x is:

The torque acting on a dipole of moment →P in an electric field →E is

Which of the following is true corresponding to the image formed by a convex mirror for a real object?

at room temperature the rms speed of the molecule of a certain diatomic gas found to be 1920 m/s .the gas i

X-rays of a particular wavelength are used to irradiate sodium and copper surfaces in two separate experiments and stopping potentials are determined. The stopping potentials are (1) Equal in both cases (2)greater for sodium (3) greater for copper (4) infinitte in both case

Two spherical stars A and B emit blackbody radiation. The radius of A is 400 times that of B and A emits 104 times the power emitted from B. The ratio (λAλB) of their wavelengths λA and λB at which the peaks occur in their respective radiation curves is

Which of the following is most volatile? Options: NH3 , PH3 , AsH3 , SbH3

Two plane mirrors inclined at 45∘ to each other. If an object is placed between them, then the number of images formed will be-

g. Choose the incorrect statement(1) Mass is the measure of inertia(2) Action12and Reaction pair cannotdistinguishedm s olcwier(3) In a circular motion centripetal foforce acts onthe body4) All of theseg ln the civen ficure a force of 24acts on

When light of wavelength 300 nm (nanometer) falls on a photoelectric emitter, photoelectrons are liberated. For another emitter, however light of 600 nm wavelength is sufficient for creating photoemission. What is the ratio of the work functions of the two emitters

A circular loop of one turn carries a current of 5.00 A. If the magnetic field B at the centre is 0.200 mT, find the radius of the loop.

how to find velocity of a graph

A ball of mass m, moving with a velocity v along X-axis, strikes another ball of mass 2m kept at rest. The first ball comes to rest after collision and the other breaks into two equal pieces. One of the pieces starts moving along Y-axis with a speed v1. What will be the velocity of the other piece?

The period of oscillation of a simple pendulum isT = 2l/g.L is about 15cm and is known to 1mm accuracy . The period of oscillation is about 1s. The time of100 oscillation is measured with a watch of 0.1s resolution. What is the accuracy indetermination of g?

The maximum electric field intensity on the axis of a uniformly charged ring of charge q and radius R will be

There are two particles A and B in space moving with velocities respectively and initial position vectors respectively. The condition for the two particles to collide isOptions:Wrong Should have chosen

Difference in heights between the liquid columns in the vertical limbs of an accelerated U-tube as shown in the figure is: [Take g=10 m/s2]

The dimensions of ab in the equation p=a−t2bx, where p is pressure, x is distance and t is time, are

Water flows through a tapering horizontal tube of radii of cross section of the ends r1 and r2. The velocity of water at the points for the radius of cross section r1 is v1. Find the force imparted by the emerging water at the other end of the tube.

A jar is filled with two non-mixing liquids 1 and 2 having densities s1 and s2 respectively. A solid ball, made of a material of density s3, is dropped in the jar. It comes to equilibrium in the position shown in the figure. Which of the following is true for s1,s2,s3?

4×1023 tritium atoms are contained in a vessel. The half-life of decay of tritium nuclei is 12.3 y. Find (a) the activity of the sample, (b) the number of decays in the next 10 hours (c) the number of decays in the next 6.15 y.

If a simple pendulum is taken to a place where g decreases by 2%, then the time period

The maximum wavelength for photoelectric emission in tungsten is 230 nm. The wavelength of light which must be used in order that maximum KE of ejected photoelectrons is 1.5 eV, is1) 280 cm2) 210 cm3) 175 cm4) 180 cm

Which of the given electronic level would allow the hydrogen atom to emit a maximum of three type of photon?

Two racing cars of masses m1 and m2 are moving in circles of radii r1 and r2 respectively. Their speeds are such that each makes a complete circle in the same time t. The ratio of the angular speeds of the first to the second car is

a coil of induc†an ce l=50uh and resis†an ce 0.5ohm is connected to a battery of emf 5v. a resis†an ce of10 ohm is connected in parallel to the coil. now at the same ins†an t the connection of the battery is switched off. then the amount of heat generated in the coil

A horizontal metallic rod of mass m and length l is supported by two vertical identical springs of spring constant K each and natural lengths l0. A current i is flowing in the rod in the direction shown. If the rod is in equilibrium, then the length of each spring in this state is-

In the following circuit diagram fig. the lengths of the wires AB and BC are same but the radius of AB is three times that of BC. The ratio of potential gradients at AB and BC will be

It is written that maximum kinetic energy of photo electron and frequency of incident radiation are having linear relationship. How?

In the given circuit taking potential at point B as zero, find the potential of point Q.

For the wave shown in the figure, write the equation of the wave if its position is shown at t=0 speed of wave is 200 m/s.

The square loop in the figure has sides of length 20 cm. It has 5 turns and carries a current of 2 A. The normal to the loop is at 37∘ to a uniform field, B=0.5^j T. Find the work needed to rotate the loop from its position of minimum energy to the given orientation.

What is the typical length (in cm) of an acoustic guitar for it to have a natural frequency of 165 Hz and an approximate tension to linear density ratio of 19600 Nm kg−1?42.4

Calculate the efficiency of a Carnot engine working between boiling point and freezing point of water.

A block of mass 2 kg is placed on the top of a bigger block of mass 10 kg as shown in figure. The system is released from rest. Assume all the surfaces are frictionless. Find the distance moved by the bigger block at the instant when the smaller block reaches the ground.

Anelectric dipole with dipole moment 4 × 10−9C m is aligned at 30° with the direction of a uniform electricfield of magnitude 5 × 104N C−1.Calculate the magnitude of the torque acting on the dipole.

If the wavefront AB is incident on the surface as shown, which among the following options show the reflected wavefront ?

In a compound microscope the focal length of an objective lens is 1.2 cm and the focal length of the eye piece is 3 cm. When the object is kept at 1.25 cm in front of the objective lens, the final image is formed at infinity. Magnifying power of the compound microscope should be:

The emf of the cell is 2.5 V. On connecting a 24 ohm resistance across the cell, the terminal potential difference falls to 2.4 V. The internal resistance of the cell is

A block of mass 25 kg is raised by a 50 kg man in two different ways as shown in Fig. 5.19. What is the action on the floor by the man in the two cases? If the floor yields to a normal force of 700 N, which mode should the man adopt to lift the block without the floor yielding?

What is the physical significance of partial differentiation