50278 + Interview Questions in Physics

1.	an athlete runs from one end to other end of semicircular track whose radius is 140 CM in 30 sec . what is the distance covered by the Marc and what is displacement at the end of the 75 sec
Answer» an athlete runs from one end to other end of semicircular track whose radius is 140 CM in 30 sec . what is the distance covered by the Marc and what is displacement at the end of the 75 sec

Discussion

2.	A 1/nth part of uniform chain of mass M and length L is hanging below the edge of the rough table having coefficient of friction u (meu) .Find the work done in pulling the chain on the table. If suddenly the chain slips then find the velocity of chain while leaving the table.
Answer» A 1/nth part of uniform chain of mass M and length L is hanging below the edge of the rough table having coefficient of friction u (meu) .Find the work done in pulling the chain on the table. If suddenly the chain slips then find the velocity of chain while leaving the table.

Discussion

3.	if potential at the surface of earth is assigmed zero value,then potential at centre of earth will be
Answer» if potential at the surface of earth is assigmed zero value,then potential at centre of earth will be

Discussion

4.	State the law of conservation of momentum.
Answer» State the law of conservation of momentum.

Discussion

5.	if ge is the acceleration due to gravity at the equator and gp be the that at the poles. assuming the earth to be a a sphere of radius Re roatating about its own axis with angular speed omega, then ge-gp is ?
Answer» if ge is the acceleration due to gravity at the equator and gp be the that at the poles. assuming the earth to be a a sphere of radius Re roatating about its own axis with angular speed omega, then ge-gp is ?

Discussion

6.	The acceleration-time graph of a body moving with uniform retardation is a straight line parallel to time axis, then
Answer» The acceleration-time graph of a body moving with uniform retardation is a straight line parallel to time axis, then

Discussion

7.	48. Calculate the frequency of particles when kinetic energy of subatomic particles is 3.79 into 10 to power minus 27 j
Answer» 48. Calculate the frequency of particles when kinetic energy of subatomic particles is 3.79 into 10 to power minus 27 j

Discussion

8.	a plane moves due east at 60 km/h over a city X at a certain time. Twelve minutes later another plane sets off from the station Y which is 40 km due north of the city and flies 37 degree south of east. If both maintain their directions , find speed with which second plane must fly in order to strike the first plane?
Answer» a plane moves due east at 60 km/h over a city X at a certain time. Twelve minutes later another plane sets off from the station Y which is 40 km due north of the city and flies 37 degree south of east. If both maintain their directions , find speed with which second plane must fly in order to strike the first plane?

Discussion

9.	The work function of a metal is
Answer» The work function of a metal is

Discussion

10.	A ball of mass 2 kg and another of mass 4 kg are dropped together from a 60 feet tall building. After a fall of 30 feet each towards earth, their respective kinetic energies will be in the ratio of
Answer» A ball of mass $2 kg$ and another of mass $4 kg$ are dropped together from a $60$ feet tall building. After a fall of $30$ feet each towards earth, their respective kinetic energies will be in the ratio of

Discussion

11.	A hollow sphere is cut into two halves and the halves are kept touching each other as shown in the diagram with axis AA' tangent to both at common point of contact. If original sphere had mass M and radius R, then find the moment of inertia of this new assembly about axis AA'.
Answer» A hollow sphere is cut into two halves and the halves are kept touching each other as shown in the diagram with axis $A A'$ tangent to both at common point of contact. If original sphere had mass $M$ and radius $R$ , then find the moment of inertia of this new assembly about axis $A A'$ .

Discussion

12.	A rope passed over a pulley which is sufficiently high. Two monkeys climb the rope from the opposite ends, one of them climbing quickly than the other. Assuming that the pulley and the rope are weightless. Which monkey would reach the top first. Please explain
Answer» A rope passed over a pulley which is sufficiently high. Two monkeys climb the rope from the opposite ends, one of them climbing quickly than the other. Assuming that the pulley and the rope are weightless. Which monkey would reach the top first. Please explain

Discussion

13.	An ideal spring with spring constant k is hung from the ceiling and a block of mass m is attached to its lower end. The mass is released with the spring initially unstretched. The maximum extension in the spring is
Answer» An ideal spring with spring constant $k$ is hung from the ceiling and a block of mass $m$ is attached to its lower end. The mass is released with the spring initially unstretched. The maximum extension in the spring is

Discussion

14.	If y=(1+x)(1+x2)(1+x4)…(1+x2n), then y′(0) is equal to
Answer» If $y = (1 + x) (1 + x^{2}) (1 + x^{4}) \dots (1 + x^{2^{n}}),$ then $y^{'} (0)$ is equal to

Discussion

15.	Two mutually perpendicular infinite wires carry positive charge densities λ1 and λ2. The electric lines of force makes angle α with second wire then λ1λ2 is
Answer» Two mutually perpendicular infinite wires carry positive charge densities $λ_{1}$ and $λ_{2}$ . The electric lines of force makes angle $α$ with second wire then $\frac{λ_{1}}{λ_{2}}$ is

Discussion

16.	The equation of Mohr's circle is given by (σ−4)2+τ2=9where σ is the normal stress and τ is the shear stress. The maximum shear stress is units. ,3
Answer» The equation of Mohr's circle is given by $(σ - 4)^{2} + τ^{2} = 9$ where $σ$ is the normal stress and $τ$ is the shear stress. The maximum shear stress is units. , 3

16.

The equation of Mohr's circle is given by (σ−4)2+τ2=9where σ is the normal stress and τ is the shear stress. The maximum shear stress is units. ,3

Answer»

The equation of Mohr's circle is given by $(σ - 4)^{2} + τ^{2} = 9$ where $σ$ is the normal stress and $τ$ is the shear stress. The maximum shear stress is units. ,

3

Discussion

17.	A battery of emf 100 V and a resistor of resistance 10 kΩ are joined in series. This system is used as a source to supply current to an external resistance R. If R is not greater than 100 Ω, the current through it is constant up to two significant digits. Find its value. This is the basic principle of a constant-current source.
Answer» A battery of emf 100 V and a resistor of resistance 10 k $Ω$ are joined in series. This system is used as a source to supply current to an external resistance R. If R is not greater than 100 $Ω$ , the current through it is constant up to two significant digits. Find its value. This is the basic principle of a constant-current source.

Discussion

18.	The length of an elastic string is A meters when the tension is 4N and B meters when tension is 5N. The length in meters when the tension is 9N
Answer» The length of an elastic string is A meters when the tension is 4N and B meters when tension is 5N. The length in meters when the tension is 9N

Discussion

19.	When a solid sphere moves through a liquid, the liquid opposes the motion with a force F. The magnitude of F depends on the coefficient of viscosity η of the liquid, the radius r of the sphere and the speed v of the sphere. Assuming that F is proportional to different powers of these quantities, guess a formula for F using the method of dimensions. Use F = -ηA(v2−v1)x2−x1
Answer» When a solid sphere moves through a liquid, the liquid opposes the motion with a force F. The magnitude of F depends on the coefficient of viscosity $η$ of the liquid, the radius r of the sphere and the speed v of the sphere. Assuming that F is proportional to different powers of these quantities, guess a formula for F using the method of dimensions. Use F = - $\frac{η A (v_{2} - v_{1})}{x_{2} - x_{1}}$

19.

When a solid sphere moves through a liquid, the liquid opposes the motion with a force F. The magnitude of F depends on the coefficient of viscosity η of the liquid, the radius r of the sphere and the speed v of the sphere. Assuming that F is proportional to different powers of these quantities, guess a formula for F using the method of dimensions. Use F = -ηA(v2−v1)x2−x1

Answer»

When a solid sphere moves through a liquid, the liquid opposes the motion with a force F. The

magnitude of F depends on the coefficient of viscosity $η$ of the liquid, the radius r of the sphere and the speed v of the sphere.

Assuming that F is proportional to different powers of these quantities, guess a formula for F using the

method of dimensions. Use F = - $\frac{η A (v_{2} - v_{1})}{x_{2} - x_{1}}$

Discussion

20.	Three identical dipoles with charges q and −q and separation a between the charges are placed at the corners of an equilateral triangle of side d as shown in fig. Find the interaction energy of the system (a<<d).
Answer» Three identical dipoles with charges $q$ and $- q$ and separation $a$ between the charges are placed at the corners of an equilateral triangle of side $d$ as shown in fig. Find the interaction energy of the system $(a << d)$ .

Discussion

21.	You have m kgs of a certain liquid in a vessel, which is heated till there is a temperature change of ΔT. If the coefficient of volume expansion is γ, what is the density of the liquid after heating, if the initial density was ρ? Ik the answer...but how did...in the last step did ρ/(1+y∆T) changes to ρ(1-y∆T) Please explain this step. Thank you!
Answer» You have m kgs of a certain liquid in a vessel, which is heated till there is a temperature change of ΔT. If the coefficient of volume expansion is γ, what is the density of the liquid after heating, if the initial density was ρ? Ik the answer...but how did...in the last step did ρ/(1+y∆T) changes to ρ(1-y∆T) Please explain this step. Thank you!

Discussion

22.	Minimum excitation potential of Bohr's first orbit in hydrogen atom is
Answer» Minimum excitation potential of Bohr's first orbit in hydrogen atom is

Discussion

23.	How to find no of rotations from angular acceleration
Answer» How to find no of rotations from angular acceleration

Discussion

24.	Find the average angular speed of the minute hand of a normal clock in 30 minutes.
Answer» Find the average angular speed of the minute hand of a normal clock in $30 minutes$ .

Discussion

25.	23. Two point masses m are connected to the light rod of length I and it is free to rotate in vertical planeas shown in figure. Then the minimum horizontal velocity that should be given to mass so that itcompletes the circular motion in vertical plane24gl(1)(2)48gl(3) 18glV 5564gl(4)V5E -LO
Answer» 23. Two point masses m are connected to the light rod of length I and it is free to rotate in vertical planeas shown in figure. Then the minimum horizontal velocity that should be given to mass so that itcompletes the circular motion in vertical plane24gl(1)(2)48gl(3) 18glV 5564gl(4)V5E -LO

Discussion

26.	If x and a stand for distance, then for what value of n in the given equation is dimensionally correct? The equation is ∫dx√a2−xn=sin−1xa
Answer» If $x$ and $a$ stand for distance, then for what value of $n$ in the given equation is dimensionally correct? The equation is $\int \frac{d x}{\sqrt{a^{2} - x^{n}}} = {sin}^{- 1} \frac{x}{a}$

Discussion

27.	Two parallel-plate capacitors, each of capacitance 40μF, are connected in series. The space between the plates of one capacitor is filled with a dielectric of dielectric constant K=3, then the equivalent capacitance of the combination is
Answer» Two parallel-plate capacitors, each of capacitance $40 μ F$ , are connected in series. The space between the plates of one capacitor is filled with a dielectric of dielectric constant $K = 3$ , then the equivalent capacitance of the combination is

Discussion

28.	A semicircular wire fo radius 'R' carries a current 'i'. What will be the magnetic field strength at its centre?
Answer» A semicircular wire fo radius 'R' carries a current 'i'. What will be the magnetic field strength at its centre?

Discussion

29.	A(−1,2,−3),B(5,0,−6) and C(0,4,−1) are the vertices of a triangle. The d.r's of the internal bisector of ∠BAC are:
Answer» $A (- 1, 2, - 3), B (5, 0, - 6)$ and $C (0, 4, - 1)$ are the vertices of a triangle. The d.r's of the internal bisector of $∠ B A C$ are:

Discussion

30.	s If frequency in a photoelectric experiment isdoubled keeping intensity constant then whichstatement is correct.(1) V, (stopping potential) will be doubled(2) Saturation current will remain constant(3) Saturation currenre correct
Answer» s If frequency in a photoelectric experiment isdoubled keeping intensity constant then whichstatement is correct.(1) V, (stopping potential) will be doubled(2) Saturation current will remain constant(3) Saturation currenre correct

Discussion

31.	Diagrammatically explain the sliding-filament theory?
Answer» Diagrammatically explain the sliding-filament theory?

Discussion

32.	Light of wavelength lamda enters a medium with refractive index n2 from a medium with refractive index n1.What is the wave lenght in second medium?
Answer» Light of wavelength lamda enters a medium with refractive index n2 from a medium with refractive index n1.What is the wave lenght in second medium?

Discussion

33.	A ball is dropped from a building.it travel 55m during the last second of its fall .the time of fall and the height of the building are (g=10m/s)
Answer» A ball is dropped from a building.it travel 55m during the last second of its fall .the time of fall and the height of the building are (g=10m/s)

Discussion

34.	An equilateral triangular loop of side L is carrying current i. Suddenly a magnetic field of magnitude B is switched on parallel to one of the sides of loop. Maximum angular velocity of loop if its mass is m is
Answer» An equilateral triangular loop of side L is carrying current i. Suddenly a magnetic field of magnitude B is switched on parallel to one of the sides of loop. Maximum angular velocity of loop if its mass is m is

Discussion

35.	A source, approaching with speed u towards the open end of a stationary pipe of length L, is emitting a sound of frequency fs. The farther end of the pipe is closed. The speed of sound in air is v and f0, is the fundamental frequency of the pipe. For which of the following combination(s) of u and fs, will the sound reaching the pipe lead to a resonance?
Answer» A source, approaching with speed $u$ towards the open end of a stationary pipe of length $L,$ is emitting a sound of frequency $f_{s} .$ The farther end of the pipe is closed. The speed of sound in air is $v$ and $f_{0},$ is the fundamental frequency of the pipe. For which of the following combination(s) of $u$ and $f_{s},$ will the sound reaching the pipe lead to a resonance?

Discussion

36.	find th maximum energy that β particle can have in the following decay {}_8^{19}O to {}_9^{19}F+{}_{-1}^0e+ ν
Answer» find th maximum energy that β particle can have in the following decay {}_8^{19}O to {}_9^{19}F+{}_{-1}^0e+ ν

Discussion

37.	What will the effect on force acting between parallel plates of-1. Isolated Capacitor 2. Capacitor connected to battery when a dielectri slab is inserted between them.
Answer» What will the effect on force acting between parallel plates of- 1. Isolated Capacitor 2. Capacitor connected to battery when a dielectri slab is inserted between them.

Discussion

38.	A bar magnet of magnetic moment 2 Am2 is free to rotate about a vertical axis passing through its centre. The magnet is then released from rest at east -west position. Find the Kinetic energy of the magnet as it takes north-south position is ________μJ (BH=25μT) (Give integer value)
Answer» A bar magnet of magnetic moment $2 {Am}^{2}$ is free to rotate about a vertical axis passing through its centre. The magnet is then released from rest at east -west position. Find the Kinetic energy of the magnet as it takes north-south position is ________ $μ J$ $(B_{H} = 25 μ T)$ (Give integer value)

Discussion

39.	A 50 g bullet moving with velocity 10 m/s strikes a block of mass 950 g at rest and gets embedded in it. The loss in kinetic energy will be
Answer» A 50 g bullet moving with velocity 10 m/s strikes a block of mass 950 g at rest and gets embedded in it. The loss in kinetic energy will be

Discussion

40.	find period function y=sec ki power 3x
Answer» find period function y=sec ki power 3x

Discussion

41.	a projectile is thrown with velocity v at an angle theta with horizontal. when the projectile is at a height equal to half of the maximum height, the vertical component of the velocity of projectile i
Answer» a projectile is thrown with velocity v at an angle theta with horizontal. when the projectile is at a height equal to half of the maximum height, the vertical component of the velocity of projectile i

Discussion

42.	When observer in non inertial frame NLM are invalid.Why?
Answer» When observer in non inertial frame NLM are invalid.Why?

Discussion

43.	what is 1. work 2. positive work 3.negative work 4. zero work 5. energy 6. kinetic energy 7.work energy theorem 8.conservative & non-conservative forces 9. power 10. potential energy 11. gravitational potential energy 12.potential energy of a spring 13. principal of conservation of mechanical energy 14.elastic & inelastic collisions 15. elastic dimensional elastic collision 16. one dimensional inelastic collision 17. two dimensional elastic collision 18.two dimensional elastic collision.
Answer» what is 1. work 2. positive work 3.negative work 4. zero work 5. energy 6. kinetic energy 7.work energy theorem 8.conservative & non-conservative forces 9. power 10. potential energy 11. gravitational potential energy 12.potential energy of a spring 13. principal of conservation of mechanical energy 14.elastic & inelastic collisions 15. elastic dimensional elastic collision 16. one dimensional inelastic collision 17. two dimensional elastic collision 18.two dimensional elastic collision.

Discussion

44.	6.A ray gets successively reflected from two mirrors inclined at 40 degree . if angle of incidence on first mirror is 30 degree then net deviation of the ray is
Answer» 6.A ray gets successively reflected from two mirrors inclined at 40 degree . if angle of incidence on first mirror is 30 degree then net deviation of the ray is

Discussion

45.	As shown in Fig.7.40, the two sides of a step ladder BA and CA are 1.6 m long and hinged at A. A rope DE, 0.5 m is tied half way up. A weight 40 kg is suspended from a point F, 1.2 m from B along the ladder BA. Assuming the floor to be frictionless and neglecting the weight of the ladder, find the tension in the rope and forces exerted by the floor on the ladder. (Take g = 9.8 m/s2)(Hint: Consider the equilibrium of each side of the ladder separately.)
Answer» As shown in Fig.7.40, the two sides of a step ladder BA and CA are 1.6 m long and hinged at A. A rope DE, 0.5 m is tied half way up. A weight 40 kg is suspended from a point F, 1.2 m from B along the ladder BA. Assuming the floor to be frictionless and neglecting the weight of the ladder, find the tension in the rope and forces exerted by the floor on the ladder. (Take g = 9.8 m/s²) (Hint: Consider the equilibrium of each side of the ladder separately.)

45.

As shown in Fig.7.40, the two sides of a step ladder BA and CA are 1.6 m long and hinged at A. A rope DE, 0.5 m is tied half way up. A weight 40 kg is suspended from a point F, 1.2 m from B along the ladder BA. Assuming the floor to be frictionless and neglecting the weight of the ladder, find the tension in the rope and forces exerted by the floor on the ladder. (Take g = 9.8 m/s2)(Hint: Consider the equilibrium of each side of the ladder separately.)

Answer»

As shown in Fig.7.40, the two sides of a step ladder BA and CA are 1.6 m long and hinged at A. A rope DE, 0.5 m is tied half way up. A weight 40 kg is suspended from a point F, 1.2 m from B along the ladder BA. Assuming the floor to be frictionless and neglecting the weight of the ladder, find the tension in the rope and forces exerted by the floor on the ladder. (Take g = 9.8 m/s²)

(Hint: Consider the equilibrium of each side of the ladder separately.)

Discussion

46.	A coil of inductance 20mH and resistance 2 ohm is connected to a source of voltage 2V, the current reaches half of its steady state value in 1)0.1s 2)0.01s 3)0.15s 4)0.0075s
Answer» A coil of inductance 20mH and resistance 2 ohm is connected to a source of voltage 2V, the current reaches half of its steady state value in 1)0.1s 2)0.01s 3)0.15s 4)0.0075s

Discussion

47.	Moment of inertia of a ring of radius R whose mass per unit length varies with parametric angle θ according to the relation λ=λ°cos²θ, about its axis will be
Answer» Moment of inertia of a ring of radius R whose mass per unit length varies with parametric angle θ according to the relation λ=λ°cos²θ, about its axis will be

Discussion

48.	Two magnets of equal masses are joined at right angles to each other as shown in the diagram. Magnet-1 has a magnetic moment three times that of magnet-2. This arrangement is pivoted so that it is free to rotate in the horizontal plane. Under equilibrium, what angle will the magent-1 subtend with the magnetic meridian?
Answer» Two magnets of equal masses are joined at right angles to each other as shown in the diagram. Magnet-1 has a magnetic moment three times that of magnet-2. This arrangement is pivoted so that it is free to rotate in the horizontal plane. Under equilibrium, what angle will the magent-1 subtend with the magnetic meridian?

Discussion

49.	THE WAVELENGTH OF SOUND WAVES IN HYDROGEN GAS CORRRSPONDING TO THE LOWER LIMIT OF AUDIBILITY I
Answer» THE WAVELENGTH OF SOUND WAVES IN HYDROGEN GAS CORRRSPONDING TO THE LOWER LIMIT OF AUDIBILITY I

Discussion

50.	Two carts on horizontal straight rails are pushed apart by an explosion of a point charge Q placed between the carts. Suppose the coefficient of friction of the two are equal and 200 kg cart travels a distance of 36 m and stops. The distance covered by the cart weighing 300 kg is
Answer» Two carts on horizontal straight rails are pushed apart by an explosion of a point charge $Q$ placed between the carts. Suppose the coefficient of friction of the two are equal and $200 kg$ cart travels a distance of $36 m$ and stops. The distance covered by the cart weighing $300 kg$ is

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

an athlete runs from one end to other end of semicircular track whose radius is 140 CM in 30 sec . what is the distance covered by the Marc and what is displacement at the end of the 75 sec

A 1/nth part of uniform chain of mass M and length L is hanging below the edge of the rough table having coefficient of friction u (meu) .Find the work done in pulling the chain on the table. If suddenly the chain slips then find the velocity of chain while leaving the table.

if potential at the surface of earth is assigmed zero value,then potential at centre of earth will be

State the law of conservation of momentum.

if ge is the acceleration due to gravity at the equator and gp be the that at the poles. assuming the earth to be a a sphere of radius Re roatating about its own axis with angular speed omega, then ge-gp is ?

The acceleration-time graph of a body moving with uniform retardation is a straight line parallel to time axis, then

48. Calculate the frequency of particles when kinetic energy of subatomic particles is 3.79 into 10 to power minus 27 j

The work function of a metal is

A ball of mass 2 kg and another of mass 4 kg are dropped together from a 60 feet tall building. After a fall of 30 feet each towards earth, their respective kinetic energies will be in the ratio of

A hollow sphere is cut into two halves and the halves are kept touching each other as shown in the diagram with axis AA' tangent to both at common point of contact. If original sphere had mass M and radius R, then find the moment of inertia of this new assembly about axis AA'.

A rope passed over a pulley which is sufficiently high. Two monkeys climb the rope from the opposite ends, one of them climbing quickly than the other. Assuming that the pulley and the rope are weightless. Which monkey would reach the top first. Please explain

An ideal spring with spring constant k is hung from the ceiling and a block of mass m is attached to its lower end. The mass is released with the spring initially unstretched. The maximum extension in the spring is

If y=(1+x)(1+x2)(1+x4)…(1+x2n), then y′(0) is equal to

Two mutually perpendicular infinite wires carry positive charge densities λ1 and λ2. The electric lines of force makes angle α with second wire then λ1λ2 is

The equation of Mohr's circle is given by (σ−4)2+τ2=9where σ is the normal stress and τ is the shear stress. The maximum shear stress is units. ,3

The length of an elastic string is A meters when the tension is 4N and B meters when tension is 5N. The length in meters when the tension is 9N

Three identical dipoles with charges q and −q and separation a between the charges are placed at the corners of an equilateral triangle of side d as shown in fig. Find the interaction energy of the system (a&lt;&lt;d).

Minimum excitation potential of Bohr's first orbit in hydrogen atom is

How to find no of rotations from angular acceleration

Find the average angular speed of the minute hand of a normal clock in 30 minutes.

23. Two point masses m are connected to the light rod of length I and it is free to rotate in vertical planeas shown in figure. Then the minimum horizontal velocity that should be given to mass so that itcompletes the circular motion in vertical plane24gl(1)(2)48gl(3) 18glV 5564gl(4)V5E -LO

If x and a stand for distance, then for what value of n in the given equation is dimensionally correct? The equation is ∫dx√a2−xn=sin−1xa

Two parallel-plate capacitors, each of capacitance 40μF, are connected in series. The space between the plates of one capacitor is filled with a dielectric of dielectric constant K=3, then the equivalent capacitance of the combination is

A semicircular wire fo radius 'R' carries a current 'i'. What will be the magnetic field strength at its centre?

A(−1,2,−3),B(5,0,−6) and C(0,4,−1) are the vertices of a triangle. The d.r's of the internal bisector of ∠BAC are:

s If frequency in a photoelectric experiment isdoubled keeping intensity constant then whichstatement is correct.(1) V, (stopping potential) will be doubled(2) Saturation current will remain constant(3) Saturation currenre correct

Diagrammatically explain the sliding-filament theory?

Light of wavelength lamda enters a medium with refractive index n2 from a medium with refractive index n1.What is the wave lenght in second medium?

A ball is dropped from a building.it travel 55m during the last second of its fall .the time of fall and the height of the building are (g=10m/s)

An equilateral triangular loop of side L is carrying current i. Suddenly a magnetic field of magnitude B is switched on parallel to one of the sides of loop. Maximum angular velocity of loop if its mass is m is

find th maximum energy that β particle can have in the following decay {}_8^{19}O to {}_9^{19}F+{}_{-1}^0e+ ν

What will the effect on force acting between parallel plates of-1. Isolated Capacitor 2. Capacitor connected to battery when a dielectri slab is inserted between them.

A bar magnet of magnetic moment 2 Am2 is free to rotate about a vertical axis passing through its centre. The magnet is then released from rest at east -west position. Find the Kinetic energy of the magnet as it takes north-south position is ________μJ (BH=25μT) (Give integer value)

A 50 g bullet moving with velocity 10 m/s strikes a block of mass 950 g at rest and gets embedded in it. The loss in kinetic energy will be

find period function y=sec ki power 3x

a projectile is thrown with velocity v at an angle theta with horizontal. when the projectile is at a height equal to half of the maximum height, the vertical component of the velocity of projectile i

When observer in non inertial frame NLM are invalid.Why?

6.A ray gets successively reflected from two mirrors inclined at 40 degree . if angle of incidence on first mirror is 30 degree then net deviation of the ray is

A coil of inductance 20mH and resistance 2 ohm is connected to a source of voltage 2V, the current reaches half of its steady state value in 1)0.1s 2)0.01s 3)0.15s 4)0.0075s

Moment of inertia of a ring of radius R whose mass per unit length varies with parametric angle θ according to the relation λ=λ°cos²θ, about its axis will be

THE WAVELENGTH OF SOUND WAVES IN HYDROGEN GAS CORRRSPONDING TO THE LOWER LIMIT OF AUDIBILITY I

Two carts on horizontal straight rails are pushed apart by an explosion of a point charge Q placed between the carts. Suppose the coefficient of friction of the two are equal and 200 kg cart travels a distance of 36 m and stops. The distance covered by the cart weighing 300 kg is

Three identical dipoles with charges q and −q and separation a between the charges are placed at the corners of an equilateral triangle of side d as shown in fig. Find the interaction energy of the system (a<<d).