50278 + Interview Questions in Physics

1.	If a photocell is illuminated with a radiation of 1240 ˚A, then the stopping potential is found to be 8 eV. The work function of the emitter and the threshold wavelength are-[Take : hc=12400 (eV)˚A]
Answer» If a photocell is illuminated with a radiation of $1240 ˚ A,$ then the stopping potential is found to be $8 eV .$ The work function of the emitter and the threshold wavelength are- [Take : $h c = 12400 (eV) ˚ A$ ]

Discussion

2.	A hydrogen atom is in an excited state of principle quantum number n. It emits a photon of wavelength λ when it returns to the ground state. The value of n is ( R is Rydberg constant)
Answer» A hydrogen atom is in an excited state of principle quantum number $n$ . It emits a photon of wavelength $λ$ when it returns to the ground state. The value of $n$ is $(R is Rydberg constant)$

Discussion

3.	Calculatethe height of the potential barrier for a head on collision of twodeuterons. (Hint: The height of the potential barrier is given by theCoulomb repulsion between the two deuterons when they just touch eachother. Assume that they can be taken as hard spheres of radius 2.0fm.)
Answer» Calculate the height of the potential barrier for a head on collision of two deuterons. (Hint: The height of the potential barrier is given by the Coulomb repulsion between the two deuterons when they just touch each other. Assume that they can be taken as hard spheres of radius 2.0 fm.)

Discussion

4.	A circular wheel comprises a ring of radius R and mass M and three spokes of mass m and length R each. The moment of inertia of the wheel about its axis passing through its centre and perpendicular to its plane is
Answer» A circular wheel comprises a ring of radius $R$ and mass $M$ and three spokes of mass $m$ and length $R$ each. The moment of inertia of the wheel about its axis passing through its centre and perpendicular to its plane is

Discussion

5.	A mass of 10 g moving with a velocity of 100 cm/sstrikes a pendulum bob of mass 10 g. The two masses stick together. The maximum height reached by thesystem now is (g= 10 m/s2) Zero 5 cm 2.5 cm 1.25 cm
Answer» A mass of 10 g moving with a velocity of 100 cm/sstrikes a pendulum bob of mass 10 g. The two masses stick together. The maximum height reached by thesystem now is (g= 10 m/s2) Zero 5 cm 2.5 cm 1.25 cm

Discussion

6.	Does NO2 and O3 have permanent dipole moment?
Answer» Does NO2 and O3 have permanent dipole moment?

Discussion

7.	If the sum of n terms of an A.P. is 3n2 + 5n and Tm = 164 then m = ?
Answer» If the sum of n terms of an A.P. is 3 $n^{2}$ + 5n and $T_{m}$ = 164 then m = ?

Discussion

8.	A force 10 N acts tangentially at the highest point of a solid sphere of mass 10 kg kept on a rough horizontal plane. If the sphere rolls without slipping, find the acceleration of the centre of the sphere (in m/s2).
Answer» A force $10 N$ acts tangentially at the highest point of a solid sphere of mass $10 kg$ kept on a rough horizontal plane. If the sphere rolls without slipping, find the acceleration of the centre of the sphere (in $m / s^{2}$ ).

Discussion

9.	A bomb of mass 16kg at rest explodes into two pieces of masses 4kg and 12kg. The velocity of the 12kg mass is 4ms−1. The kinetic energy of the other mass is
Answer» A bomb of mass $16 kg$ at rest explodes into two pieces of masses $4 kg$ and $12 kg$ . The velocity of the $12 kg$ mass is $4 {ms}^{- 1}$ . The kinetic energy of the other mass is

Discussion

10.	2 blocks A and B of masses hundred kg and 20 kg respectively separated by the distance of 5 M kept on the smooth surface a mass of the 60 kg is then added to block a now in order to experience the same attraction force as before the two blocks should be separated by the distance of
Answer» 2 blocks A and B of masses hundred kg and 20 kg respectively separated by the distance of 5 M kept on the smooth surface a mass of the 60 kg is then added to block a now in order to experience the same attraction force as before the two blocks should be separated by the distance of

Discussion

11.	ntWhat is the difference between i) A B and ii) A B?n
Answer» ntWhat is the difference between i) A B and ii) A B?n

Discussion

12.	Equivalent capacitance
Answer» Equivalent capacitance

Discussion

13.	Two sources S1 and S2, emitting light of wavelength 600 nm, are placed a distance 1.0×10−2 cm apart. A detector can be moved on the line S1P, which is perpendicular to S1S2. What would be the minimum path difference (Approximately) at the detector, as it moves along the line S1P?
Answer» Two sources $S_{1}$ and $S_{2}$ , emitting light of wavelength $600 nm$ , are placed a distance $1.0 \times 10^{- 2} cm$ apart. A detector can be moved on the line $S_{1} P$ , which is perpendicular to $S_{1} S_{2}$ . What would be the minimum path difference (Approximately) at the detector, as it moves along the line $S_{1} P$ ?

Discussion

14.	Theceiling of a long hall is 25 m high. What is the maximum horizontaldistance that a ball thrown with a speed of 40 ms–1can go without hitting the ceiling of the hall?
Answer» The ceiling of a long hall is 25 m high. What is the maximum horizontal distance that a ball thrown with a speed of 40 m s^–1 can go without hitting the ceiling of the hall?

Discussion

15.	Evaluate ∫6−3x+6dx
Answer» Evaluate $\int \frac{6}{- 3 x + 6} d x$

Discussion

16.	Figures 10.23(a) and (b) refer to the steady flow of a (non-viscous) liquid. Which of the two figures is incorrect ? Why ?
Answer» Figures 10.23(a) and (b) refer to the steady flow of a (non-viscous) liquid. Which of the two figures is incorrect ? Why ?

Discussion

17.	five capacitors each of capacitance c are connected as shown in the figure .the ratio of capacitance between p and r and between p and q
Answer» five capacitors each of capacitance c are connected as shown in the figure .the ratio of capacitance between p and r and between p and q

Discussion

18.	two sides of a triangle represents two vectors 2i+3j+4k and 4i+3j+5k area of triangle is 1)9\sqrt2 ; 2)9\sqrt3 ; 3) 9/2 ; 4) 9\sqrt3/2
Answer» two sides of a triangle represents two vectors 2i+3j+4k and 4i+3j+5k area of triangle is 1)9\sqrt2 ; 2)9\sqrt3 ; 3) 9/2 ; 4) 9\sqrt3/2

Discussion

19.	A square current carrying loop of side 'a' produced magnatic field at its centre is 'B' .find magnatic moment of this loop in terms of 'B'
Answer» A square current carrying loop of side 'a' produced magnatic field at its centre is 'B' .find magnatic moment of this loop in terms of 'B'

Discussion

20.	An ac voltage source V=V0sinωt is connected across resistance R and capacitance C as shown in figure. It is given that R=1ωC. The peak current is I0. If the angular frequency of the voltage source is changed to ω√3 by keeping R and C fixed, then the new peak current in the circuit is-
Answer» An ac voltage source $V = V_{0} sin ω t$ is connected across resistance $R$ and capacitance $C$ as shown in figure. It is given that $R = \frac{1}{ω C}$ . The peak current is $I_{0}$ . If the angular frequency of the voltage source is changed to $\frac{ω}{\sqrt{3}}$ by keeping $R$ and $C$ fixed, then the new peak current in the circuit is-

Discussion

21.	In which organ is Somatostatin-28 present?
Answer» In which organ is Somatostatin-28 present?

Discussion

22.	A U-tube of base length l is filled with same volume of two liquids of densities ρ and 2ρ. It is moving with an acceleration a on the horizontal plane. If the height difference between the 2 surfaces (open to the atmosphere) becomes zero; then the height of the liquids h is given by( in terms of a,g and l
Answer» A U-tube of base length l is filled with same volume of two liquids of densities ρ and 2ρ. It is moving with an acceleration a on the horizontal plane. If the height difference between the 2 surfaces (open to the atmosphere) becomes zero; then the height of the liquids h is given by( in terms of a,g and l

Discussion

23.	Two tiny spheres carrying charges 1.5 μC and 2.5 μC are located 30 cm apart. Find the potential and electric field: (a) at the mid-point of the line joining the two charges, and (b) at a point 10 cm from this midpoint in a plane normal to the line and passing through the mid-point.
Answer» Two tiny spheres carrying charges 1.5 μC and 2.5 μC are located 30 cm apart. Find the potential and electric field: (a) at the mid-point of the line joining the two charges, and (b) at a point 10 cm from this midpoint in a plane normal to the line and passing through the mid-point.

Discussion

24.	While heating water, bubbles begin to form at the bottom of the vessel. After a while, they detach and rise. Consider a bubble to be a sphere of radius R and making a circular contact of radius r with the bottom of the vessel. Here, r<<R, the surface tension of water is T, and density of water is ρw. The value of r, just before the bubble detaches is,
Answer» While heating water, bubbles begin to form at the bottom of the vessel. After a while, they detach and rise. Consider a bubble to be a sphere of radius $R$ and making a circular contact of radius $r$ with the bottom of the vessel. Here, $r << R$ , the surface tension of water is $T$ , and density of water is $ρ_{w}$ . The value of $r$ , just before the bubble detaches is,

Discussion

25.	Ksino+ncos Where K and nare (+ve) constants. Find the minimum value of F (e isA force F depends on 0 as Facute)Ksin0+ncos6 के अनुसार निर्भर करता है, जहां Kऔर n धनात्मक नियतांक हैं। F का न्यूनतम मान ज्ञात करें (e न्यून कोण है)एक बल F, e पर F
Answer» Ksino+ncos Where K and nare (+ve) constants. Find the minimum value of F (e isA force F depends on 0 as Facute)Ksin0+ncos6 के अनुसार निर्भर करता है, जहां Kऔर n धनात्मक नियतांक हैं। F का न्यूनतम मान ज्ञात करें (e न्यून कोण है)एक बल F, e पर F

Discussion

26.	80.In the far-field diffraction pattern of single slit under polychromatic illumination, the first minimum with the wavelength lambda1 is found to be coincident with the third maximum at lambda 2 .So A)3lamda1=0.3lamda2 B)3lamda1=lamda2 C)lamda1=3.5lamda2 D)0.3lamda1=3lamda2
Answer» 80.In the far-field diffraction pattern of single slit under polychromatic illumination, the first minimum with the wavelength lambda1 is found to be coincident with the third maximum at lambda 2 .So A)3lamda1=0.3lamda2 B)3lamda1=lamda2 C)lamda1=3.5lamda2 D)0.3lamda1=3lamda2

Discussion

27.	An object of density ρ=500 kg/m3 is hanging from a thin steel wire. The fundamental frequency of transverse standing wave on the wire is 200 Hz. The set up is now immersed in water, so that one third of the object's volume is submerged. The new fundamental frequency (in Hz) is: [Given : Density of water (ρw)=1000 kg/m3]
Answer» An object of density $ρ = 500 {kg/m}^{3}$ is hanging from a thin steel wire. The fundamental frequency of transverse standing wave on the wire is $200 Hz$ . The set up is now immersed in water, so that one third of the object's volume is submerged. The new fundamental frequency (in $Hz$ ) is: [Given : Density of water $(ρ_{w}) = 1000 {kg/m}^{3}$ ]

Discussion

28.	q1, q2, q3 and q4 are point charges located at points as shown in the figure and S is a spherical Gaussian surface of radius R. Which of the following is true according to the Gauss's law ?
Answer» $q_{1}, q_{2}, q_{3}$ and $q_{4}$ are point charges located at points as shown in the figure and S is a spherical Gaussian surface of radius $R$ . Which of the following is true according to the Gauss's law ?

Discussion

29.	30.Find the equivalent resistance between points P and Q
Answer» 30.Find the equivalent resistance between points P and Q

Discussion

30.	A film of soap solution is trapped between a vertical frame and a light wire ab of length 0.1 m. If acceleration due to gravity g=10 ms−2 and surface tension T=25×10−3 Nm−1, then the load W that should be suspended from the wire to keep it in equilibrium is
Answer» A film of soap solution is trapped between a vertical frame and a light wire $a b$ of length $0.1 m$ . If acceleration due to gravity $g = 10 m s^{- 2}$ and surface tension $T = 25 \times 10^{- 3} N m^{- 1}$ , then the load $W$ that should be suspended from the wire to keep it in equilibrium is

30.

A film of soap solution is trapped between a vertical frame and a light wire ab of length 0.1 m. If acceleration due to gravity g=10 ms−2 and surface tension T=25×10−3 Nm−1, then the load W that should be suspended from the wire to keep it in equilibrium is

Answer»

A film of soap solution is trapped between a vertical frame and a light wire $a b$ of length $0.1 m$ . If acceleration due to gravity $g = 10 m s^{- 2}$ and surface tension $T = 25 \times 10^{- 3} N m^{- 1}$ , then the load $W$ that should be suspended from the wire to keep it in equilibrium is

Discussion

31.	The ends of a metallic metre stick are maintained at temperatures 200∘C and 0∘C. If one end of a metallic rod of same material is maintained at 20∘C, where should its other end be kept in contact with metre stick so that there is no heat current in the rod in its steady state conduction?
Answer» The ends of a metallic metre stick are maintained at temperatures $200^{\circ} C$ and $0^{\circ} C$ . If one end of a metallic rod of same material is maintained at $20^{\circ} C,$ where should its other end be kept in contact with metre stick so that there is no heat current in the rod in its steady state conduction?

Discussion

32.	The kinetic energy KE of a particle moving along a circle of radius R depends on the dis†an ce covered as KE=as^3 where a is cons†an t. Find the total force acting on the particle
Answer» The kinetic energy KE of a particle moving along a circle of radius R depends on the dis†an ce covered as KE=as^3 where a is cons†an t. Find the total force acting on the particle

Discussion

33.	A simple pendulum of length l has been set up inside a railway wagon sliding down a frictionless inclined plane having an angle of inclination θ=30∘ with the horizontal. The period of oscillation as recorded by an observer inside the wagon is
Answer» A simple pendulum of length $l$ has been set up inside a railway wagon sliding down a frictionless inclined plane having an angle of inclination $θ = 30^{\circ}$ with the horizontal. The period of oscillation as recorded by an observer inside the wagon is

Discussion

34.	A certain charge Q is divided at first into two parts, q and Q−q. Later on, the charges are placed at a certain distance. If the force of interaction between the two charges is maximum, then-
Answer» A certain charge $Q$ is divided at first into two parts, $q$ and $Q - q$ . Later on, the charges are placed at a certain distance. If the force of interaction between the two charges is maximum, then-

Discussion

35.	If the angle of polarization for a medium is 60°, what will be critical angle?
Answer» If the angle of polarization for a medium is $60 °$ , what will be critical angle?

Discussion

36.	two particles having mass M and m are moving in a circular path having radius R and r if their time periods are same then ratio of their angular speed is
Answer» two particles having mass M and m are moving in a circular path having radius R and r if their time periods are same then ratio of their angular speed is

Discussion

37.	If S and V are the change in surface area and volume, when two soap bubbles coalesce under isothermal condition, then (σ is surface tension, Po is atmospheric pressure)
Answer» If S and V are the change in surface area and volume, when two soap bubbles coalesce under isothermal condition, then ( $σ$ is surface tension, $P_{o}$ is atmospheric pressure)

Discussion

38.	Coil of 800 turns of effective area 0.05 m2 is kept perpendicular to a magnetic field of magnitude 5×10−5 T. When the plane of the coil is rotated by 90°around any of its coplanar axis in 0.1 s, the emf induced in the coil will be
Answer» Coil of 800 turns of effective area $0.05 m^{2}$ is kept perpendicular to a magnetic field of magnitude $5 \times 10^{- 5} T$ . When the plane of the coil is rotated by $90 °$ around any of its coplanar axis in $0.1 s$ , the emf induced in the coil will be

Discussion

39.	A simple pendulum has time period T the Bob is given negative charge and surface below it is given positive charge. The new time period is:-Less than TGreater than T Equal to TInfinite
Answer» A simple pendulum has time period T the Bob is given negative charge and surface below it is given positive charge. The new time period is:- Less than T Greater than T Equal to T Infinite

Discussion

40.	A wire elongates by 2 mm when a load W is hanged from it. If this wire goes over a pulley and two weightsW each are hung at the two ends then elongation in the wire will be(2) 0.5 mm(3) 2 mm(4) 4 mm
Answer» A wire elongates by 2 mm when a load W is hanged from it. If this wire goes over a pulley and two weightsW each are hung at the two ends then elongation in the wire will be(2) 0.5 mm(3) 2 mm(4) 4 mm

Discussion

41.	There are several pair of material when they are rubbed with each other, equal and opposite charges are transferred. How will you explain conservation of charges?
Answer» There are several pair of material when they are rubbed with each other, equal and opposite charges are transferred. How will you explain conservation of charges?

Discussion

42.	13.A body is of mass 10 kg. It moves inXY plane starting from rest. Its potentialenergy is given by U = -16x + 12y(x and y are in metre). The speed of thebody at t 5 s is-1
Answer» 13.A body is of mass 10 kg. It moves inXY plane starting from rest. Its potentialenergy is given by U = -16x + 12y(x and y are in metre). The speed of thebody at t 5 s is-1

Discussion

43.	Correct representation of stopping potential (V0) with respect to frequency (ν) of radiation is
Answer» Correct representation of stopping potential $(V_{0})$ with respect to frequency $(ν)$ of radiation is

Discussion

44.	Wavenumber of radiation having wavelength lambda = 5000 A
Answer» Wavenumber of radiation having wavelength lambda = 5000 A

Discussion

45.	A block of mass m1 is pushed towards the movable wedge of mass m2 and height h, with a velocity v0. All surfaces are smooth. The minimum value of v0 for which the block will reach the top of the wedge is
Answer» A block of mass $m_{1}$ is pushed towards the movable wedge of mass $m_{2}$ and height $h$ , with a velocity $v_{0}$ . All surfaces are smooth. The minimum value of $v_{0}$ for which the block will reach the top of the wedge is

Discussion

46.	a copper rod o length l is rotated about one end perpendicular to the uniorm magnetic ield B with constant angular velocity w . the induced em between its two ends is
Answer» a copper rod o length l is rotated about one end perpendicular to the uniorm magnetic ield B with constant angular velocity w . the induced em between its two ends is

Discussion

47.	Find the temperature at which molecules of oxygen gas have the same rms speed as that of Helium atoms at 240 K.{Molecular mass of O2=32 g/mol & He=4 g/mol}
Answer» Find the temperature at which molecules of oxygen gas have the same rms speed as that of Helium atoms at $240 K$ . ${Molecular mass of O_{2} = 32 g/mol & He = 4 g/mol}$

Discussion

48.	During the construction of rDNA by using ECO R1 number of formed phosphodiester and hydrogen bonds respectively are?
Answer» During the construction of rDNA by using ECO R1 number of formed phosphodiester and hydrogen bonds respectively are?

Discussion

49.	63.The field inside the conductor is always zero. Even if we place a charge inside the conductor , the charges on the conductor gets redistributed to make the electic field inside zero. Now, if we place a charge Q inside the metallic hollow sphere of radius R and make a gaussian surface at a distance x(
Answer» 63.The field inside the conductor is always zero. Even if we place a charge inside the conductor , the charges on the conductor gets redistributed to make the electic field inside zero. Now, if we place a charge Q inside the metallic hollow sphere of radius R and make a gaussian surface at a distance x(

Discussion

50.	A single phase, 2000 V alternator has armature resistance and reactance of 0.8 Ωand 4 Ω respectively. The voltage regulation of alternator at 100 A load at 0.8 leading power factor is______%.-6.96
Answer» A single phase, 2000 V alternator has armature resistance and reactance of 0.8 $Ω$ and 4 $Ω$ respectively. The voltage regulation of alternator at 100 A load at 0.8 leading power factor is______%. -6.96

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

If a photocell is illuminated with a radiation of 1240 ˚A, then the stopping potential is found to be 8 eV. The work function of the emitter and the threshold wavelength are-[Take : hc=12400 (eV)˚A]

A hydrogen atom is in an excited state of principle quantum number n. It emits a photon of wavelength λ when it returns to the ground state. The value of n is ( R is Rydberg constant)

Calculatethe height of the potential barrier for a head on collision of twodeuterons. (Hint: The height of the potential barrier is given by theCoulomb repulsion between the two deuterons when they just touch eachother. Assume that they can be taken as hard spheres of radius 2.0fm.)

A circular wheel comprises a ring of radius R and mass M and three spokes of mass m and length R each. The moment of inertia of the wheel about its axis passing through its centre and perpendicular to its plane is

A mass of 10 g moving with a velocity of 100 cm/sstrikes a pendulum bob of mass 10 g. The two masses stick together. The maximum height reached by thesystem now is (g= 10 m/s2) Zero 5 cm 2.5 cm 1.25 cm

Does NO2 and O3 have permanent dipole moment?

If the sum of n terms of an A.P. is 3n2 + 5n and Tm = 164 then m = ?

A force 10 N acts tangentially at the highest point of a solid sphere of mass 10 kg kept on a rough horizontal plane. If the sphere rolls without slipping, find the acceleration of the centre of the sphere (in m/s2).

A bomb of mass 16kg at rest explodes into two pieces of masses 4kg and 12kg. The velocity of the 12kg mass is 4ms−1. The kinetic energy of the other mass is

2 blocks A and B of masses hundred kg and 20 kg respectively separated by the distance of 5 M kept on the smooth surface a mass of the 60 kg is then added to block a now in order to experience the same attraction force as before the two blocks should be separated by the distance of

ntWhat is the difference between i) A B and ii) A B?n

Equivalent capacitance

Two sources S1 and S2, emitting light of wavelength 600 nm, are placed a distance 1.0×10−2 cm apart. A detector can be moved on the line S1P, which is perpendicular to S1S2. What would be the minimum path difference (Approximately) at the detector, as it moves along the line S1P?

Theceiling of a long hall is 25 m high. What is the maximum horizontaldistance that a ball thrown with a speed of 40 ms–1can go without hitting the ceiling of the hall?

Evaluate ∫6−3x+6dx

Figures 10.23(a) and (b) refer to the steady flow of a (non-viscous) liquid. Which of the two figures is incorrect ? Why ?

five capacitors each of capacitance c are connected as shown in the figure .the ratio of capacitance between p and r and between p and q

two sides of a triangle represents two vectors 2i+3j+4k and 4i+3j+5k area of triangle is 1)9\sqrt2 ; 2)9\sqrt3 ; 3) 9/2 ; 4) 9\sqrt3/2

A square current carrying loop of side 'a' produced magnatic field at its centre is 'B' .find magnatic moment of this loop in terms of 'B'

An ac voltage source V=V0sinωt is connected across resistance R and capacitance C as shown in figure. It is given that R=1ωC. The peak current is I0. If the angular frequency of the voltage source is changed to ω√3 by keeping R and C fixed, then the new peak current in the circuit is-

In which organ is Somatostatin-28 present?

Two tiny spheres carrying charges 1.5 μC and 2.5 μC are located 30 cm apart. Find the potential and electric field: (a) at the mid-point of the line joining the two charges, and (b) at a point 10 cm from this midpoint in a plane normal to the line and passing through the mid-point.

80.In the far-field diffraction pattern of single slit under polychromatic illumination, the first minimum with the wavelength lambda1 is found to be coincident with the third maximum at lambda 2 .So A)3lamda1=0.3lamda2 B)3lamda1=lamda2 C)lamda1=3.5lamda2 D)0.3lamda1=3lamda2

q1, q2, q3 and q4 are point charges located at points as shown in the figure and S is a spherical Gaussian surface of radius R. Which of the following is true according to the Gauss's law ?

30.Find the equivalent resistance between points P and Q

A film of soap solution is trapped between a vertical frame and a light wire ab of length 0.1 m. If acceleration due to gravity g=10 ms−2 and surface tension T=25×10−3 Nm−1, then the load W that should be suspended from the wire to keep it in equilibrium is

The ends of a metallic metre stick are maintained at temperatures 200∘C and 0∘C. If one end of a metallic rod of same material is maintained at 20∘C, where should its other end be kept in contact with metre stick so that there is no heat current in the rod in its steady state conduction?

The kinetic energy KE of a particle moving along a circle of radius R depends on the dis†an ce covered as KE=as^3 where a is cons†an t. Find the total force acting on the particle

A simple pendulum of length l has been set up inside a railway wagon sliding down a frictionless inclined plane having an angle of inclination θ=30∘ with the horizontal. The period of oscillation as recorded by an observer inside the wagon is

A certain charge Q is divided at first into two parts, q and Q−q. Later on, the charges are placed at a certain distance. If the force of interaction between the two charges is maximum, then-

If the angle of polarization for a medium is 60°, what will be critical angle?

two particles having mass M and m are moving in a circular path having radius R and r if their time periods are same then ratio of their angular speed is

If S and V are the change in surface area and volume, when two soap bubbles coalesce under isothermal condition, then (σ is surface tension, Po is atmospheric pressure)

Coil of 800 turns of effective area 0.05 m2 is kept perpendicular to a magnetic field of magnitude 5×10−5 T. When the plane of the coil is rotated by 90°around any of its coplanar axis in 0.1 s, the emf induced in the coil will be

A simple pendulum has time period T the Bob is given negative charge and surface below it is given positive charge. The new time period is:-Less than TGreater than T Equal to TInfinite

A wire elongates by 2 mm when a load W is hanged from it. If this wire goes over a pulley and two weightsW each are hung at the two ends then elongation in the wire will be(2) 0.5 mm(3) 2 mm(4) 4 mm

There are several pair of material when they are rubbed with each other, equal and opposite charges are transferred. How will you explain conservation of charges?

13.A body is of mass 10 kg. It moves inXY plane starting from rest. Its potentialenergy is given by U = -16x + 12y(x and y are in metre). The speed of thebody at t 5 s is-1

Correct representation of stopping potential (V0) with respect to frequency (ν) of radiation is

Wavenumber of radiation having wavelength lambda = 5000 A

A block of mass m1 is pushed towards the movable wedge of mass m2 and height h, with a velocity v0. All surfaces are smooth. The minimum value of v0 for which the block will reach the top of the wedge is

a copper rod o length l is rotated about one end perpendicular to the uniorm magnetic ield B with constant angular velocity w . the induced em between its two ends is

Find the temperature at which molecules of oxygen gas have the same rms speed as that of Helium atoms at 240 K.{Molecular mass of O2=32 g/mol &amp; He=4 g/mol}

During the construction of rDNA by using ECO R1 number of formed phosphodiester and hydrogen bonds respectively are?

A single phase, 2000 V alternator has armature resistance and reactance of 0.8 Ωand 4 Ω respectively. The voltage regulation of alternator at 100 A load at 0.8 leading power factor is______%.-6.96

Find the temperature at which molecules of oxygen gas have the same rms speed as that of Helium atoms at 240 K.{Molecular mass of O2=32 g/mol & He=4 g/mol}