50278 + Interview Questions in Physics

1.	If K.E. increases by 3%. Then momentum willincrease by:21.(1) 1.5%(2) 9%Tots(4) 2%(3) 3%
Answer» If K.E. increases by 3%. Then momentum willincrease by:21.(1) 1.5%(2) 9%Tots(4) 2%(3) 3%

Discussion

2.	A point starts moving in a straight line with a certain acceleration. At a time t after beginning of motion the acceleration suddenly becomes retardation of the same value. The total time in which the point returns to the initial position is
Answer» A point starts moving in a straight line with a certain acceleration. At a time t after beginning of motion the acceleration suddenly becomes retardation of the same value. The total time in which the point returns to the initial position is

Discussion

3.	ntA boy of mass M , standing at a height h tgrows a ball of mass m vertically down with a speed u.Assuming no gravity ,the distance of man above the ground when ball reaches the floor isn nt(1) hn nt(2) ((M-m)h)/Mn nt(3)((m-M)h)/Mn nt(4)((m+M)h)/Mn
Answer» ntA boy of mass M , standing at a height h tgrows a ball of mass m vertically down with a speed u.Assuming no gravity ,the distance of man above the ground when ball reaches the floor isn nt(1) hn nt(2) ((M-m)h)/Mn nt(3)((m-M)h)/Mn nt(4)((m+M)h)/Mn

Discussion

4.	how to find approximately where to keep a charge so that it has no net force from (for ex two other charges)
Answer» how to find approximately where to keep a charge so that it has no net force from (for ex two other charges)

Discussion

5.	a wheel having moment of inertia 2kgm2 about its vertical axis rotates at the rate of 60rpm about its axos the torque which can stop yhe wheel in one minute would b
Answer» a wheel having moment of inertia 2kgm2 about its vertical axis rotates at the rate of 60rpm about its axos the torque which can stop yhe wheel in one minute would b

Discussion

6.	It's given that force between charges is independent of the medium between them but it is also given that the force reduces when medium is changed. Is that only the effect of force that is changed and not the actual force exerted?
Answer» It's given that force between charges is independent of the medium between them but it is also given that the force reduces when medium is changed. Is that only the effect of force that is changed and not the actual force exerted?

Discussion

7.	There are three co concentric spheres A B and C with radius are r2r and 3r respectively there is a charge of 2 q on the outer surface of c and q charge on the outer surface of a the year B is being Earth then find the potential on each sphere
Answer» There are three co concentric spheres A B and C with radius are r2r and 3r respectively there is a charge of 2 q on the outer surface of c and q charge on the outer surface of a the year B is being Earth then find the potential on each sphere

Discussion

8.	An 8 kW, 250 V, 1200 rpm dc shunt motor has Ra=0.7Ω. The field current is adjusted, until on no-load with a supply of 250 V, the motor runs at 1250 rpm and draws armature current of 1.6 A. A load torque is then applied to the motor shaft, which causes the Ia to rise to 40 A and the speed falls to 1150 rpm. The reduction in flux per pole due to armature reaction is___________%. 3.01
Answer» An 8 kW, 250 V, 1200 rpm dc shunt motor has $R_{a} = 0.7 Ω$ . The field current is adjusted, until on no-load with a supply of 250 V, the motor runs at 1250 rpm and draws armature current of 1.6 A. A load torque is then applied to the motor shaft, which causes the $I_{a}$ to rise to 40 A and the speed falls to 1150 rpm. The reduction in flux per pole due to armature reaction is___________%. 3.01

Discussion

9.	An under water swimmer is at a depth of 12 m below the surface of water. A bird is at a height of 18 m from the surface of water, directly above his eyes. For the swimmer the bird appears to be at a distance from the surface of water equal to (Refractive index of water is 43)
Answer» An under water swimmer is at a depth of $12 m$ below the surface of water. A bird is at a height of $18 m$ from the surface of water, directly above his eyes. For the swimmer the bird appears to be at a distance from the surface of water equal to (Refractive index of water is $\frac{4}{3}$ )

Discussion

10.	A particle experience an acceleration a = (4e–3t) m/s2 along positive x-axis, where t is time in s. If the initial velocity of the particle is 2 m/s along positive x-axis, the velocity of the particle when its acceleration becomes zero is
Answer» A particle experience an acceleration a = (4e–3t) m/s2 along positive x-axis, where t is time in s. If the initial velocity of the particle is 2 m/s along positive x-axis, the velocity of the particle when its acceleration becomes zero is

Discussion

11.	A particle vertically upward with any velocity.The distance travelled by particle in first second of it's descent?
Answer» A particle vertically upward with any velocity.The distance travelled by particle in first second of it's descent?

Discussion

12.	12. A black hole is an object whose gravitational fieldis so strong that even light cannot escape from it.To what approximate radius would earth(mass 5.98 x 1024 kg) have to be compresed tobe a black hole?[AIPMT-2014](1) 10-9 m(2) 10-6 m(3) 10-2 m(4) 100 m
Answer» 12. A black 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 x 1024 kg) have to be compresed to be a black hole? [AIPMT-2014] (1) 10-9 m (2) 10-6 m (3) 10-2 m (4) 100 m

Discussion

13.	Equilibrium of symmetric geometrical point charged systemValue of Q at centre for which system to be in state of equilibriumoQa.of a equilateral triangle and squarewith each side a and charge on ech vertex q
Answer» Equilibrium of symmetric geometrical point charged systemValue of Q at centre for which system to be in state of equilibriumoQa.of a equilateral triangle and squarewith each side a and charge on ech vertex q

Discussion

14.	The maximum current can be drawn from which of the following cells?
Answer» The maximum current can be drawn from which of the following cells?

Discussion

15.	A ball A IS DROPPED from the top of a building of height 100m. At the same the another ball name B is thrown upward with speed 50m/s from the bottom of the building the time when balls meet AND where ball A will meet ball B
Answer» A ball A IS DROPPED from the top of a building of height 100m. At the same the another ball name B is thrown upward with speed 50m/s from the bottom of the building the time when balls meet AND where ball A will meet ball B

Discussion

16.	The distance between the two charges +q and −q of a dipole is r. On the axial line at a distance d from the centre of dipole, the intensity is proportional to
Answer» The distance between the two charges $+ q$ and $- q$ of a dipole is $r$ . On the axial line at a distance $d$ from the centre of dipole, the intensity is proportional to

Discussion

17.	Two mutually perpendicular wire carry charge densities λ1 and λ2. The electric line of force makes angle α with second wire, then the ratio λ1λ2 is equal to (in terms of angle α)
Answer» Two mutually perpendicular wire carry charge densities $λ_{1}$ and $λ_{2}$ . The electric line of force makes angle $α$ with second wire, then the ratio $\frac{λ_{1}}{λ_{2}}$ is equal to (in terms of angle $α)$

Discussion

18.	A bar magnet of magnetic moment 3.0 Am2 is placed in a uniform magnetic field of 2×10−5 T. If each pole experiences a force of 6×10−4 N, the length of the magnet is
Answer» A bar magnet of magnetic moment $3.0 {Am}^{2}$ is placed in a uniform magnetic field of $2 \times 10^{- 5} T$ . If each pole experiences a force of $6 \times 10^{- 4} N$ , the length of the magnet is

Discussion

19.	Find difference between the given vectors A & B.
Answer» Find difference between the given vectors A & B.

19.

Find difference between the given vectors A & B.

Answer»

Find difference between the given vectors A & B.

Discussion

20.	A rod of uniform thickness is placed along x-axis with one end at origin. If length of rod is L and its linear mass density is proportional to x, then find distance of its centre of mass from origin.
Answer» A rod of uniform thickness is placed along x-axis with one end at origin. If length of rod is L and its linear mass density is proportional to x, then find distance of its centre of mass from origin.

Discussion

21.	A physical pendulum consists of three equal thin bars of length l and mass m which forms an equilateral triangle as shown in figure.Find the angular frequency of small oscillations.
Answer» A physical pendulum consists of three equal thin bars of length l and mass m which forms an equilateral triangle as shown in figure.Find the angular frequency of small oscillations.

21.

A physical pendulum consists of three equal thin bars of length l and mass m which forms an equilateral triangle as shown in figure.Find the angular frequency of small oscillations.

Answer»

A physical pendulum consists of three equal thin bars of length l and mass m which forms an equilateral triangle as shown in figure.Find the angular frequency of small oscillations.

Discussion

22.	A uniform magnetic field, →B=(3^i+4^j+5^k) T, exists in a region. A rod of length 5 m, placed along y−axis, is moved along x−axis with constant speed of 1 ms−1. The magnitude of induced emf in the rod is(Give integer value only)
Answer» A uniform magnetic field, $\to B = (3^i + 4^j + 5^k) T$ , exists in a region. A rod of length $5 m$ , placed along $y -$ axis, is moved along $x -$ axis with constant speed of $1 {ms}^{- 1}$ . The magnitude of induced emf in the rod is (Give integer value only)

Discussion

23.	If the unit of force,energy and velocity are 100 dyne,400 erg and 10cm/s respectively, find the unit of length,mass and time.
Answer» If the unit of force,energy and velocity are 100 dyne,400 erg and 10cm/s respectively, find the unit of length,mass and time.

Discussion

24.	A string wound round the rim of a mounted flywheel of mass 20kgand radius 20cm.A steady pull of 25 N is applied on the cord.Neglecting friction and mass of the string,the angular acceleration of the wheel is
Answer» A string wound round the rim of a mounted flywheel of mass 20kgand radius 20cm.A steady pull of 25 N is applied on the cord.Neglecting friction and mass of the string,the angular acceleration of the wheel is

Discussion

25.	59. Balls are being thrown with speed u at an angle theta with horizontal at the rate n balls per second. Mass of each ball is m . What is the average force exerted by the balks at point P. (
Answer» 59. Balls are being thrown with speed u at an angle theta with horizontal at the rate n balls per second. Mass of each ball is m . What is the average force exerted by the balks at point P. (

Discussion

26.	A certain diatomic molecule, AB has dipolemoment 1.6 D and the internuclear distance is100 pm. The percentage of electronic chargeexisting on more electronegative atom is(1) 33%(2) 25%(3) 50%(4) 10%
Answer» A certain diatomic molecule, AB has dipolemoment 1.6 D and the internuclear distance is100 pm. The percentage of electronic chargeexisting on more electronegative atom is(1) 33%(2) 25%(3) 50%(4) 10%

Discussion

27.	The radius of a coil of wire with N turns is 0.22 m and 3.5 A current flows clockwise in the coil as shown. A long straight wire carrying a current 54 A towards the left is located 0.05 m from the edge of the coil. The magnetic field at the centre of the coil is zero tesla. The number of turns N in the coil are :
Answer» The radius of a coil of wire with N turns is 0.22 m and 3.5 A current flows clockwise in the coil as shown. A long straight wire carrying a current 54 A towards the left is located 0.05 m from the edge of the coil. The magnetic field at the centre of the coil is zero tesla. The number of turns N in the coil are :

Discussion

28.	If the pitch of a note from a closed organ pipe of metal is independent of small variations in temperature, then the ratio of cubical expansion of air to that of metal (assume that pressure remains unchanged and initial temperature of air is 0∘C) is 4/3x, then x= _______
Answer» If the pitch of a note from a closed organ pipe of metal is independent of small variations in temperature, then the ratio of cubical expansion of air to that of metal (assume that pressure remains unchanged and initial temperature of air is $0^{\circ} C$ ) is 4/3x, then x= _______

Discussion

29.	A rod of length l is pivoted at one end and is rotated with a uniform angular velocity in a horizontal plane .the value of x for point p where tension is 1/4th of the tension at 0
Answer» A rod of length l is pivoted at one end and is rotated with a uniform angular velocity in a horizontal plane .the value of x for point p where tension is 1/4th of the tension at 0

Discussion

30.	A truck starts from rest and accelerates uniformly at 2.0 m s¯². At t = 10 s, a stone is dropped by a person standing on the top of the truck (6 m high from the ground). What are the (a) velocity, and (b) acceleration of the stone at t = 11s ? (Neglect air resistance.)
Answer» A truck starts from rest and accelerates uniformly at 2.0 m s¯². At t = 10 s, a stone is dropped by a person standing on the top of the truck (6 m high from the ground). What are the (a) velocity, and (b) acceleration of the stone at t = 11s ? (Neglect air resistance.)

Discussion

31.	Interference fringes are produced by a double slit arrangement and a plane parallel glass of refractive index 1.5 is placed in front of one of the interfering beam. If the fringes are displaced through 30 fringe width for light of wavelength 6×10−5 cm, then the thickness of the plate will be:
Answer» Interference fringes are produced by a double slit arrangement and a plane parallel glass of refractive index $1.5$ is placed in front of one of the interfering beam. If the fringes are displaced through $30$ fringe width for light of wavelength $6 \times 10^{- 5} cm$ , then the thickness of the plate will be:

Discussion

32.	Photons emitted when electrons in a H-atom make transition from a higher energy state to lower energy state, whose difference in angular momentum is hπ , are made to be incident on a sample of sodium metal (work function, W=2.3 eV). What will be the kinetic energy of the photoelectrons?
Answer» Photons emitted when electrons in a H-atom make transition from a higher energy state to lower energy state, whose difference in angular momentum is $\frac{h}{π}$ , are made to be incident on a sample of sodium metal (work function, $W = 2.3 e V$ ). What will be the kinetic energy of the photoelectrons?

Discussion

33.	Which electronic appliances can be jammed using emp jammer
Answer» Which electronic appliances can be jammed using emp jammer

Discussion

34.	Two cars intially at 20 km from the square are approaching towards it. One at 60 km/h and another at 80 km/h. Minimum separation between the cars is [in km] (Write until two digits after the decimal point.)
Answer» Two cars intially at 20 km from the square are approaching towards it. One at 60 km/h and another at 80 km/h. Minimum separation between the cars is [in km] (Write until two digits after the decimal point.)

Discussion

35.	one mole of an ideal gas is heated isobarically by supplying Q=1.6kJ of heat .if temperature of gas increases by 72K THE VALUE OF γ IS
Answer» one mole of an ideal gas is heated isobarically by supplying Q=1.6kJ of heat .if temperature of gas increases by 72K THE VALUE OF γ IS

Discussion

36.	One of the satellite of Jupiter has an orbital period of 1.769 days and the radius of the orbit is 4.88×108 m. Show that the mass of the Jupiter is about one-thousand that of the sun.
Answer» One of the satellite of Jupiter has an orbital period of 1.769 days and the radius of the orbit is $4.88 \times 10^{8} m$ . Show that the mass of the Jupiter is about one-thousand that of the sun.

Discussion

37.	A coil has power factor of 0.707 at 60 Hz. Then its power factor at 180 Hz will be what? Also explain.
Answer» A coil has power factor of 0.707 at 60 Hz. Then its power factor at 180 Hz will be what? Also explain.

Discussion

38.	Which of the following graphs represent the behavior of an ideal gas ? Symbols have their usual meaning.
Answer» Which of the following graphs represent the behavior of an ideal gas ? Symbols have their usual meaning.

Discussion

39.	A thin film of soap solution (μs=1.4) lies on the top of a glass plate (μg=1.5). When visible light is incident almost normal to the plate, two adjacent reflection maxima are observed at two wavelegths 420 nm and 630 nm. The minimum thickness of the soap solution are
Answer» A thin film of soap solution $(μ_{s} = 1.4)$ lies on the top of a glass plate $(μ_{g} = 1.5)$ . When visible light is incident almost normal to the plate, two adjacent reflection maxima are observed at two wavelegths $420 nm$ and $630 nm$ . The minimum thickness of the soap solution are

Discussion

40.	A resistance of potentiometer wire of length 10m is 25 ohm. A resistance box and a 2 volt accumulator are connected in series with it. What resistance should be introduced from the resistance box to have potential drop of one microvolt per millimeter of the potentiometer wire
Answer» A resistance of potentiometer wire of length 10m is 25 ohm. A resistance box and a 2 volt accumulator are connected in series with it. What resistance should be introduced from the resistance box to have potential drop of one microvolt per millimeter of the potentiometer wire

Discussion

41.	A man is rowing a boat with a constant velocity vo in a river of depth ′D′. The contact area of boat is ′A′ and coefficient of viscosity of water is η. Find the force required to row the boat.
Answer» A man is rowing a boat with a constant velocity $v_{o}$ in a river of depth $^{'} D^{'}$ . The contact area of boat is $^{'} A^{'}$ and coefficient of viscosity of water is $η$ . Find the force required to row the boat.

Discussion

42.	what is the difference between avogadro no. and avogadro cons†an t ?
Answer» what is the difference between avogadro no. and avogadro cons†an t ?

Discussion

43.	How does electrostatic potential works.
Answer» How does electrostatic potential works.

Discussion

44.	Vectors →A=a^i+a^j+3^k and →B=a^i−2^j−^k are perpendicular to each other, then the positive value of a is
Answer» Vectors $\to A = a^i + a^j + 3^k$ and $\to B = a^i - 2^j -^k$ are perpendicular to each other, then the positive value of $a$ is

Discussion

45.	Two coherent narrow slits emitting light of wavelength λ in the same phase are placed parallel to each other at a small separation of 2λ. The light is collected on a screen which is placed at a distance D(>>λ) from the slit S1 as shown in figure.Find x such that the path difference between the waves from the two sources is λ at point P.
Answer» Two coherent narrow slits emitting light of wavelength $λ$ in the same phase are placed parallel to each other at a small separation of $2 λ$ . The light is collected on a screen which is placed at a distance $D (>> λ)$ from the slit $S_{1}$ as shown in figure. Find $x$ such that the path difference between the waves from the two sources is $λ$ at point $P$ .

Discussion

46.	In which of these states of matter is the effect of pressure highest?
Answer» In which of these states of matter is the effect of pressure highest?

Discussion

47.	Assertion : When the speed of an electron increases its specific charge decreases. Reason: Specific charge is the ratio of the charge to mass.
Answer» Assertion : When the speed of an electron increases its specific charge decreases. Reason: Specific charge is the ratio of the charge to mass.

Discussion

48.	State three factors on which loudness of sound heard by a listener depends.
Answer» State three factors on which loudness of sound heard by a listener depends.

Discussion

49.	54.The wavelength of K-alpha x rays for lead isotopes pb208,pb206 and pb204 are v1 ,v2,and v3 respectiVely then
Answer» 54.The wavelength of K-alpha x rays for lead isotopes pb208,pb206 and pb204 are v1 ,v2,and v3 respectiVely then

Discussion

50.	A wheel having mass 1 kg has charges 10 nC and −10 nC on diametrically opposite points as shown in figure. It remains in equilibrium on a rough inclined plane in the presence of a uniform vertical electric field E. What is the value of E ?(Take g=10 m/s2)
Answer» A wheel having mass $1 kg$ has charges $10 n C$ and $- 10 n C$ on diametrically opposite points as shown in figure. It remains in equilibrium on a rough inclined plane in the presence of a uniform vertical electric field $E$ . What is the value of $E$ ? (Take $g = 10 {m/s}^{2}$ )

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

If K.E. increases by 3%. Then momentum willincrease by:21.(1) 1.5%(2) 9%Tots(4) 2%(3) 3%

A point starts moving in a straight line with a certain acceleration. At a time t after beginning of motion the acceleration suddenly becomes retardation of the same value. The total time in which the point returns to the initial position is

ntA boy of mass M , standing at a height h tgrows a ball of mass m vertically down with a speed u.Assuming no gravity ,the distance of man above the ground when ball reaches the floor isn nt(1) hn nt(2) ((M-m)h)/Mn nt(3)((m-M)h)/Mn nt(4)((m+M)h)/Mn

how to find approximately where to keep a charge so that it has no net force from (for ex two other charges)

a wheel having moment of inertia 2kgm2 about its vertical axis rotates at the rate of 60rpm about its axos the torque which can stop yhe wheel in one minute would b

It's given that force between charges is independent of the medium between them but it is also given that the force reduces when medium is changed. Is that only the effect of force that is changed and not the actual force exerted?

There are three co concentric spheres A B and C with radius are r2r and 3r respectively there is a charge of 2 q on the outer surface of c and q charge on the outer surface of a the year B is being Earth then find the potential on each sphere

An under water swimmer is at a depth of 12 m below the surface of water. A bird is at a height of 18 m from the surface of water, directly above his eyes. For the swimmer the bird appears to be at a distance from the surface of water equal to (Refractive index of water is 43)

A particle experience an acceleration a = (4e–3t) m/s2 along positive x-axis, where t is time in s. If the initial velocity of the particle is 2 m/s along positive x-axis, the velocity of the particle when its acceleration becomes zero is

A particle vertically upward with any velocity.The distance travelled by particle in first second of it's descent?

12. A black hole is an object whose gravitational fieldis so strong that even light cannot escape from it.To what approximate radius would earth(mass 5.98 x 1024 kg) have to be compresed tobe a black hole?[AIPMT-2014](1) 10-9 m(2) 10-6 m(3) 10-2 m(4) 100 m

Equilibrium of symmetric geometrical point charged systemValue of Q at centre for which system to be in state of equilibriumoQa.of a equilateral triangle and squarewith each side a and charge on ech vertex q

The maximum current can be drawn from which of the following cells?

A ball A IS DROPPED from the top of a building of height 100m. At the same the another ball name B is thrown upward with speed 50m/s from the bottom of the building the time when balls meet AND where ball A will meet ball B

The distance between the two charges +q and −q of a dipole is r. On the axial line at a distance d from the centre of dipole, the intensity is proportional to

Two mutually perpendicular wire carry charge densities λ1 and λ2. The electric line of force makes angle α with second wire, then the ratio λ1λ2 is equal to (in terms of angle α)

A bar magnet of magnetic moment 3.0 Am2 is placed in a uniform magnetic field of 2×10−5 T. If each pole experiences a force of 6×10−4 N, the length of the magnet is

Find difference between the given vectors A &amp; B.

A rod of uniform thickness is placed along x-axis with one end at origin. If length of rod is L and its linear mass density is proportional to x, then find distance of its centre of mass from origin.

A physical pendulum consists of three equal thin bars of length l and mass m which forms an equilateral triangle as shown in figure.Find the angular frequency of small oscillations.

A uniform magnetic field, →B=(3^i+4^j+5^k) T, exists in a region. A rod of length 5 m, placed along y−axis, is moved along x−axis with constant speed of 1 ms−1. The magnitude of induced emf in the rod is(Give integer value only)

If the unit of force,energy and velocity are 100 dyne,400 erg and 10cm/s respectively, find the unit of length,mass and time.

A string wound round the rim of a mounted flywheel of mass 20kgand radius 20cm.A steady pull of 25 N is applied on the cord.Neglecting friction and mass of the string,the angular acceleration of the wheel is

59. Balls are being thrown with speed u at an angle theta with horizontal at the rate n balls per second. Mass of each ball is m . What is the average force exerted by the balks at point P. (

A certain diatomic molecule, AB has dipolemoment 1.6 D and the internuclear distance is100 pm. The percentage of electronic chargeexisting on more electronegative atom is(1) 33%(2) 25%(3) 50%(4) 10%

If the pitch of a note from a closed organ pipe of metal is independent of small variations in temperature, then the ratio of cubical expansion of air to that of metal (assume that pressure remains unchanged and initial temperature of air is 0∘C) is 4/3x, then x= _______

A rod of length l is pivoted at one end and is rotated with a uniform angular velocity in a horizontal plane .the value of x for point p where tension is 1/4th of the tension at 0

A truck starts from rest and accelerates uniformly at 2.0 m s¯². At t = 10 s, a stone is dropped by a person standing on the top of the truck (6 m high from the ground). What are the (a) velocity, and (b) acceleration of the stone at t = 11s ? (Neglect air resistance.)

Interference fringes are produced by a double slit arrangement and a plane parallel glass of refractive index 1.5 is placed in front of one of the interfering beam. If the fringes are displaced through 30 fringe width for light of wavelength 6×10−5 cm, then the thickness of the plate will be:

Photons emitted when electrons in a H-atom make transition from a higher energy state to lower energy state, whose difference in angular momentum is hπ , are made to be incident on a sample of sodium metal (work function, W=2.3 eV). What will be the kinetic energy of the photoelectrons?

Which electronic appliances can be jammed using emp jammer

Two cars intially at 20 km from the square are approaching towards it. One at 60 km/h and another at 80 km/h. Minimum separation between the cars is [in km] (Write until two digits after the decimal point.)

one mole of an ideal gas is heated isobarically by supplying Q=1.6kJ of heat .if temperature of gas increases by 72K THE VALUE OF γ IS

One of the satellite of Jupiter has an orbital period of 1.769 days and the radius of the orbit is 4.88×108 m. Show that the mass of the Jupiter is about one-thousand that of the sun.

A coil has power factor of 0.707 at 60 Hz. Then its power factor at 180 Hz will be what? Also explain.

Which of the following graphs represent the behavior of an ideal gas ? Symbols have their usual meaning.

A thin film of soap solution (μs=1.4) lies on the top of a glass plate (μg=1.5). When visible light is incident almost normal to the plate, two adjacent reflection maxima are observed at two wavelegths 420 nm and 630 nm. The minimum thickness of the soap solution are

A resistance of potentiometer wire of length 10m is 25 ohm. A resistance box and a 2 volt accumulator are connected in series with it. What resistance should be introduced from the resistance box to have potential drop of one microvolt per millimeter of the potentiometer wire

A man is rowing a boat with a constant velocity vo in a river of depth ′D′. The contact area of boat is ′A′ and coefficient of viscosity of water is η. Find the force required to row the boat.

what is the difference between avogadro no. and avogadro cons†an t ?

How does electrostatic potential works.

Vectors →A=a^i+a^j+3^k and →B=a^i−2^j−^k are perpendicular to each other, then the positive value of a is

In which of these states of matter is the effect of pressure highest?

Assertion : When the speed of an electron increases its specific charge decreases. Reason: Specific charge is the ratio of the charge to mass.

State three factors on which loudness of sound heard by a listener depends.

54.The wavelength of K-alpha x rays for lead isotopes pb208,pb206 and pb204 are v1 ,v2,and v3 respectiVely then

A wheel having mass 1 kg has charges 10 nC and −10 nC on diametrically opposite points as shown in figure. It remains in equilibrium on a rough inclined plane in the presence of a uniform vertical electric field E. What is the value of E ?(Take g=10 m/s2)

Find difference between the given vectors A & B.