50278 + Interview Questions in Physics Page 268 InterviewSolution

13351.	point masses m1 and m2 are placed at the opposite ends of a rigid rod of length L and negligible mass. The rod is to be set in rotation about an axis perpendicular to it. Find the position on this rod through which the axis should pass in order that the work required to set the rod in rotation with angular speed omega should be minimu
Answer» point masses m1 and m2 are placed at the opposite ends of a rigid rod of length L and negligible mass. The rod is to be set in rotation about an axis perpendicular to it. Find the position on this rod through which the axis should pass in order that the work required to set the rod in rotation with angular speed omega should be minimu

Discussion

13352.	In a Young's double slit experiment, the slits S1 and S2 are illuminated by a parallel beam of light of wavelength 4000 ˙A from the medium of refractive index μ1=1.2. A thin film of thickness 1.2 μm and refractive index μ=1.5 is placed in front of S1 perpendicular to the path of light. The refractive index of the medium between the plane of slits and screen is μ2=1.4. If the light coming from S1 and S2 have equal intensity 1 W/m2, then the intensityin W/m2 at the geometrical centre of screen O is
Answer» In a Young's double slit experiment, the slits $S_{1}$ and $S_{2}$ are illuminated by a parallel beam of light of wavelength $4000 ˙ A$ from the medium of refractive index $μ_{1} = 1.2$ . A thin film of thickness $1.2 μ m$ and refractive index $μ = 1.5$ is placed in front of $S_{1}$ perpendicular to the path of light. The refractive index of the medium between the plane of slits and screen is $μ_{2} = 1.4$ . If the light coming from $S_{1}$ and $S_{2}$ have equal intensity $1 {W/m}^{2}$ , then the intensity ${in W/m}^{2}$ at the geometrical centre of screen $O$ is

Discussion

13353.	If 1200W mercury lamp emits monochromatic radiation of wavelength 660nm. The number of photons emitted per second is(h=6.6×10^{-34}Js) (1) 2×10^{18} (2) 3×10^{16} (3) 8×10^{16} (4) 4×10^{21
Answer» If 1200W mercury lamp emits monochromatic radiation of wavelength 660nm. The number of photons emitted per second is(h=6.6×10^{-34}Js) (1) 2×10^{18} (2) 3×10^{16} (3) 8×10^{16} (4) 4×10^{21

Discussion

13354.	The ratio of energy flux and momentum density
Answer» The ratio of energy flux and momentum density

Discussion

13355.	1.how to find spin multiplicity of any subshell For eg , find it for 4d
Answer» 1.how to find spin multiplicity of any subshell For eg , find it for 4d

Discussion

13356.	Find the correct option among the following - [ a→ absorptive power, r→ reflective power, t→ transmissive power ]
Answer» Find the correct option among the following - $[a \to$ absorptive power, $r \to$ reflective power, $t \to$ transmissive power $]$

Discussion

13357.	A solid cylinder is rolling without slipping on a plane having inclination θ and the coefficient of static friction μ_s. The relation between θ and μ_{s }is 1)†an θ>3μ_s 2)†an θ≤3μ_s 3)†an θ
Answer» A solid cylinder is rolling without slipping on a plane having inclination θ and the coefficient of static friction μ_s. The relation between θ and μ_{s }is 1)†an θ>3μ_s 2)†an θ≤3μ_s 3)†an θ<3μ_s^{

Discussion

13358.	Apoint charge of 2.0 μC is at the centre of a cubic Gaussiansurface 9.0 cm on edge. What is the net electric flux through thesurface?
Answer» A point charge of 2.0 μC is at the centre of a cubic Gaussian surface 9.0 cm on edge. What is the net electric flux through the surface?

Discussion

13359.	A large †an k is filled with water upto a height H.A small hole is made at the base of the †an k.It takes T_1 time to decrease the height of water to H/x\lbrack x>1\rbrack and it takes time T_2 to take out the rest of the water.If T_1=T_2,then the value of x is?
Answer» A large †an k is filled with water upto a height H.A small hole is made at the base of the †an k.It takes T_1 time to decrease the height of water to H/x\lbrack x>1\rbrack and it takes time T_2 to take out the rest of the water.If T_1=T_2,then the value of x is?

Discussion

13360.	What is the equipotential surface for a two identical point charge system
Answer» What is the equipotential surface for a two identical point charge system

Discussion

13361.	A particle stays at rest as seen in a frame. We can conclude that
Answer» A particle stays at rest as seen in a frame. We can conclude that

Discussion

13362.	48.A 500 microcoulomb charge at a centre of a square of side 10 cm. Find the work done in moving a charge of 10 microcoulomb between two diagonally opposite points on the square.
Answer» 48.A 500 microcoulomb charge at a centre of a square of side 10 cm. Find the work done in moving a charge of 10 microcoulomb between two diagonally opposite points on the square.

Discussion

13363.	Which of the path (I) or (II) of a projectile has more time of flight? Use necessary assumptions. Given H1 = H2
Answer» Which of the path (I) or (II) of a projectile has more time of flight? Use necessary assumptions. Given $H_{1}$ = $H_{2}$

13363.

Which of the path (I) or (II) of a projectile has more time of flight? Use necessary assumptions. Given H1 = H2

Answer»

Which of the path (I) or (II) of a projectile has more time of flight? Use necessary assumptions.
Given $H_{1}$ = $H_{2}$

Discussion

13364.	Escape velocity from earth is about 11kms−1. Escape velocity from a planet having twice the radius and same mean density as the earth is.
Answer» Escape velocity from earth is about $11 k m s^{- 1}$ . Escape velocity from a planet having twice the radius and same mean density as the earth is.

Discussion

13365.	coversion of 1 Mw power on a new system having basic unit mass , length and time as 10 kg ,1 dm and 1minute respectively is
Answer» coversion of 1 Mw power on a new system having basic unit mass , length and time as 10 kg ,1 dm and 1minute respectively is

Discussion

13366.	Two circular current carrying coils of radius 3 cm and 6 cm are having equal magnetic moment. Find the ratio of currents in the loops.
Answer» Two circular current carrying coils of radius $3 cm$ and $6 cm$ are having equal magnetic moment. Find the ratio of currents in the loops.

Discussion

13367.	Difference between intrinsic and extrinsic semiconductors.
Answer» Difference between intrinsic and extrinsic semiconductors.

Discussion

13368.	Remplace les mots soulignés par ' y/en':1. Mets le livre sur la table.2. Donne un bouquet de fleurs à ton ami.3. N'entre pas dans cette salle .4. Ne mange pas de chips .
Answer» Remplace les mots soulignés par ' y/en': 1. Mets le livre sur la table. 2. Donne un bouquet de fleurs à ton ami. 3. N'entre pas dans cette salle . 4. Ne mange pas de chips .

Discussion

13369.	Two charges( q,m) and (- q ,m) are connected by a massless rod of lenght l and released in a region of uniform electric field as shown .find the maximum speed of the charges
Answer» Two charges( q,m) and (- q ,m) are connected by a massless rod of lenght l and released in a region of uniform electric field as shown .find the maximum speed of the charges

Discussion

13370.	Tea contained in a mug is an example of:
Answer» Tea contained in a mug is an example of:

Discussion

13371.	Man A and B come to the middle of a boat which is at rest. Then displacement of the boat (neglecting any kind of friction) will be
Answer» Man $A$ and $B$ come to the middle of a boat which is at rest. Then displacement of the boat (neglecting any kind of friction) will be

Discussion

13372.	The current i in the circuit will be
Answer» The current i in the circuit will be

Discussion

13373.	the unit of length ,velocity and force are doubled.Which of the following is the correct change in the other units? -unit of time is doubled -unit of mass is doubled -unit of momentum is doubled -unit of energy is double
Answer» the unit of length ,velocity and force are doubled.Which of the following is the correct change in the other units? -unit of time is doubled -unit of mass is doubled -unit of momentum is doubled -unit of energy is double

Discussion

13374.	a 200m long train moving with velocity 20m/s overtakes a man running in the same direction in 20 seconds .how long the train will take to overtake the man if he was running in opposite d
Answer» a 200m long train moving with velocity 20m/s overtakes a man running in the same direction in 20 seconds .how long the train will take to overtake the man if he was running in opposite d

Discussion

13375.	A solid cylinder having a radius of 0.4 m, initially rotating (at t=0) with angular velocity ω0=54 rad/s is placed on a rough inclined plane with θ=37∘ having friction coefficient μ=0.5. The time taken by the cylinder to start pure rolling is[Take g=10 m/s2]
Answer» A solid cylinder having a radius of $0.4 m$ , initially rotating (at $t = 0$ ) with angular velocity $ω_{0} = 54 rad/s$ is placed on a rough inclined plane with $θ = 37^{\circ}$ having friction coefficient $μ = 0.5$ . The time taken by the cylinder to start pure rolling is [Take $g = 10 {m/s}^{2}$ ]

Discussion

13376.	Two point charges of magnitude +q and -q are placed at (-d/2,0,0) and (d/2,0,0), respectively. Find the equation of equipotential surface, where the potential is zero.
Answer» Two point charges of magnitude +q and -q are placed at (-d/2,0,0) and (d/2,0,0), respectively. Find the equation of equipotential surface, where the potential is zero.

Discussion

13377.	The dimension of a/b in the equation p=a-t^2/bx,where p is pressure,x is distance and t is time,are:(1) [M^2LT^3](2) [ML^0T^-2](3) [ML^3T^-1](4) [M^0LT^-3]
Answer» The dimension of a/b in the equation p=a-t^2/bx,where p is pressure,x is distance and t is time,are: (1) [M^2LT^3] (2) [ML^0T^-2] (3) [ML^3T^-1] (4) [M^0LT^-3]

Discussion

13378.	If 50% energy released during fission would be converted into electrical energy, then the number of fission in a second in a nuclear reactor of 6.4 MW output is[Energy per fission=200 MeV]
Answer» If $50 %$ energy released during fission would be converted into electrical energy, then the number of fission in a second in a nuclear reactor of $6.4 MW$ output is $[Energy per fission = 200 MeV]$

Discussion

13379.	Stopping potential for photoelectrons
Answer» Stopping potential for photoelectrons

Discussion

13380.	A block of mass m is placed at the top of a smooth wedge ABC. The wedge is rotated about an axis passing through C as shown in the figure. The value of angular speed ω such that the block at A does not slip on the wedge is
Answer» A block of mass $m$ is placed at the top of a smooth wedge ABC. The wedge is rotated about an axis passing through C as shown in the figure. The value of angular speed $ω$ such that the block at $A$ does not slip on the wedge is

Discussion

13381.	A ball is thrown vertically upward. At the highest point in its path, which of the following statements is correct?
Answer» A ball is thrown vertically upward. At the highest point in its path, which of the following statements is correct?

Discussion

13382.	Water flows in a horizontal tube. The pressure of water changes by 600 N m-2between A and B where the areas of cross section are 30 cm2 and 15 cm2 respectively. Find the rate of flow of water through the tube. Given √0.4= 0.63 approx.
Answer» Water flows in a horizontal tube. The pressure of water changes by 600 N m^-2between A and B where the areas of cross section are 30 cm² and 15 cm² respectively. Find the rate of flow of water through the tube. Given $\sqrt{0.4}$ = 0.63 approx.

13382.

Water flows in a horizontal tube. The pressure of water changes by 600 N m-2between A and B where the areas of cross section are 30 cm2 and 15 cm2 respectively. Find the rate of flow of water through the tube. Given √0.4= 0.63 approx.

Answer»

Water flows in a horizontal tube. The pressure of water changes by 600 N m^-2between A and B where the areas of cross section are 30 cm² and 15 cm² respectively. Find the rate of flow of water through the tube. Given $\sqrt{0.4}$ = 0.63 approx.

Discussion

13383.	79. Assertion: A particle has enough energy to pass from gold foil in Rutherford experiment. Reason:This is due to uniform distribution of mass over the entire atom.
Answer» 79. Assertion: A particle has enough energy to pass from gold foil in Rutherford experiment. Reason:This is due to uniform distribution of mass over the entire atom.

Discussion

13384.	An average emf of 20 V is induced in an inductor when the current in it is changed from 2.5 A in one direction to 5.5 A in the opposite direction, in 0.1 s. Find the self-inductance of the inductor.
Answer» An average emf of $20 V$ is induced in an inductor when the current in it is changed from $2.5 A$ in one direction to $5.5 A$ in the opposite direction, in $0.1 s$ . Find the self-inductance of the inductor.

Discussion

13385.	what is electron cloud?is it necessary that always we can get a electron in electron cloud?
Answer» what is electron cloud?is it necessary that always we can get a electron in electron cloud?

Discussion

13386.	A pre-timed four phase signal has critical lane flow rate for the first three phases as 200, 187 and 210 veh/hr with saturation flow rate of 1800 veh/hr/lane. The lost time is given as 4 second for each phase. If the cycle length is 60 sec, the effective green time (in second) of the fourth phase is_____15.755
Answer» A pre-timed four phase signal has critical lane flow rate for the first three phases as 200, 187 and 210 veh/hr with saturation flow rate of 1800 veh/hr/lane. The lost time is given as 4 second for each phase. If the cycle length is 60 sec, the effective green time (in second) of the fourth phase is_____ 15.755

13386.

A pre-timed four phase signal has critical lane flow rate for the first three phases as 200, 187 and 210 veh/hr with saturation flow rate of 1800 veh/hr/lane. The lost time is given as 4 second for each phase. If the cycle length is 60 sec, the effective green time (in second) of the fourth phase is_____15.755

Answer»

A pre-timed four phase signal has critical lane flow rate for the first three phases as 200, 187 and 210 veh/hr with saturation flow rate of 1800 veh/hr/lane. The lost time is given as 4 second for each phase. If the cycle length is 60 sec, the effective green time (in second) of the fourth phase is_____

15.755

Discussion

13387.	If the energy absorbed by each X2 molecule of a gas is 3.5% 10-19 J and the bond energy of X2 is 180.6 kJ mol-1 then the kinetic energy per atom will be (1) 2.5 x 10-19 J (3) 2.5 x 10-20 J (2) 5.0 x 10-20 J (4) 1.5x10-19 J
Answer» If the energy absorbed by each X2 molecule of a gas is 3.5% 10-19 J and the bond energy of X2 is 180.6 kJ mol-1 then the kinetic energy per atom will be (1) 2.5 x 10-19 J (3) 2.5 x 10-20 J (2) 5.0 x 10-20 J (4) 1.5x10-19 J

Discussion

13388.	A ring of radius R=4 m has mass of m1=5.4×109 kg, which is distributed uniformly over its circumference. A highly dense particle of mass m2=5.4×109 kg is placed along the axis of the ring at a distance x0=3 m from the centre. Neglecting all other forces, except mutual gravitational interaction between the ring and particle. Calculate displacement of the ring when particle is at the centre of the ring.
Answer» A ring of radius $R = 4 m$ has mass of $m_{1} = 5.4$ $\times 10^{9} kg$ , which is distributed uniformly over its circumference. A highly dense particle of mass $m_{2} = 5.4$ $\times 10^{9} kg$ is placed along the axis of the ring at a distance $x_{0} = 3 m$ from the centre. Neglecting all other forces, except mutual gravitational interaction between the ring and particle. Calculate displacement of the ring when particle is at the centre of the ring.

Discussion

13389.	A hollow uncharged spherical conductor has inner radius A and outer radius b. A positive point charge +q is in the cavity at the center of the sphere (Fig. 3.48). Find the potential V( r) everywhere, assuming thatatV=0 at r= infinty
Answer» A hollow uncharged spherical conductor has inner radius A and outer radius b. A positive point charge +q is in the cavity at the center of the sphere (Fig. 3.48). Find the potential V( r) everywhere, assuming that at V=0 at r= infinty

Discussion

13390.	when 4 bar magnets of moments M,2M,3M,4M are arranged to form a square with unlike poles at each corner then resul†an t magnetic moment is
Answer» when 4 bar magnets of moments M,2M,3M,4M are arranged to form a square with unlike poles at each corner then resul†an t magnetic moment is

Discussion

13391.	Diameter of a plano-convex lens is 6 cm and thickness at the centre is 3 mm. If speed of light in material of lens is 2×108 m/s, the focal length of the lens is :
Answer» Diameter of a plano-convex lens is $6 cm$ and thickness at the centre is $3 mm$ . If speed of light in material of lens is $2 \times 10^{8} m/s$ , the focal length of the lens is :

Discussion

13392.	In the figure shown above, the output voltage V0 is______V. (Assume op-amps are ideal) 0
Answer» $In the figure shown above, the output voltage V_{0} is______V. (Assume op-amps are ideal)$ 0

Discussion

13393.	A Kundt's tube apparatus has a steel rod of length 1 m clamped at the centre. It is vibrated in its fundamental mode at a frequency of 2600 Hz. The lycopodium powder dispersed in the tube collects into heaps seperates by 6.5 cm. Calculate the speed of sound in air
Answer» A Kundt's tube apparatus has a steel rod of length $1 m$ clamped at the centre. It is vibrated in its fundamental mode at a frequency of $2600 Hz$ . The lycopodium powder dispersed in the tube collects into heaps seperates by $6.5 cm$ . Calculate the speed of sound in air

Discussion

13394.	Two cylindrical wires A and B are of the same material. Their lengths are in the ratio 1:2 and the diameters are in the ratio 2:1. If they are pulled by the same force, then increase in their respective lengths will be in the ratio
Answer» Two cylindrical wires $A$ and $B$ are of the same material. Their lengths are in the ratio $1 : 2$ and the diameters are in the ratio $2 : 1$ . If they are pulled by the same force, then increase in their respective lengths will be in the ratio

Discussion

13395.	Three masses of 15 kg. 10 kg and 5 kg are suspended vertically as shown in the fig. If the string attached to the support breaks and the system falls freely, what will be the tension in the string between 10 kg and 5 kg masses. Take g=10ms−2 . It is assumed that the string remains tight during the motion
Answer» Three masses of 15 kg. 10 kg and 5 kg are suspended vertically as shown in the fig. If the string attached to the support breaks and the system falls freely, what will be the tension in the string between 10 kg and 5 kg masses. Take $g = 10 m s^{- 2}$ . It is assumed that the string remains tight during the motion

13395.

Three masses of 15 kg. 10 kg and 5 kg are suspended vertically as shown in the fig. If the string attached to the support breaks and the system falls freely, what will be the tension in the string between 10 kg and 5 kg masses. Take g=10ms−2 . It is assumed that the string remains tight during the motion

Answer»

Three masses of 15 kg. 10 kg and 5 kg are suspended vertically as shown in the fig. If the string attached to the support breaks and the system falls freely, what will be the tension in the string between 10 kg and 5 kg masses. Take $g = 10 m s^{- 2}$ . It is assumed that the string remains tight during the motion

Discussion

13396.	THE MAGNITUDE OF CHANGE IN VELOCITY OF A PARTICLE HAVING SPEED V IS V DURING A TIME INTERVAL\bigtriangleup t WHILE MOVING IN A UNIFORM CIRCULAR MOTION THEMAGNITUDE OF AVERAGE FORCE ON THE PARTICLE IS PROPORTIONAL T
Answer» THE MAGNITUDE OF CHANGE IN VELOCITY OF A PARTICLE HAVING SPEED V IS V DURING A TIME INTERVAL\bigtriangleup t WHILE MOVING IN A UNIFORM CIRCULAR MOTION THEMAGNITUDE OF AVERAGE FORCE ON THE PARTICLE IS PROPORTIONAL T

Discussion

13397.	Consider a sphere of radius R exposed to radiation of intensity I as shown in figure. If surface of sphere is partially reflecting with reflection coefficient is 0.3, then radiation force experienced is
Answer» Consider a sphere of radius $R$ exposed to radiation of intensity $I$ as shown in figure. If surface of sphere is partially reflecting with reflection coefficient is $0.3$ , then radiation force experienced is

Discussion

13398.	A bob of mass m=50 kg is suspended from the ceiling of a trolley by a light inextensible string. If the trolley accelerates horizontally, the string makes an angle 30o with the vertical. Find the acceleration of the trolley.
Answer» A bob of mass $m = 50 kg$ is suspended from the ceiling of a trolley by a light inextensible string. If the trolley accelerates horizontally, the string makes an angle $30^{o}$ with the vertical. Find the acceleration of the trolley.

Discussion

13399.	A projectile can have the same range for two angles of projection . If T1 and T2 be the times of flight in the two cases, then what is the initial velocity of projection?
Answer» A projectile can have the same range for two angles of projection . If T1 and T2 be the times of flight in the two cases, then what is the initial velocity of projection?

Discussion

13400.	A jet plane is travelling towards west at a speed of 1800 km/h. Whatis the voltage difference developed between the ends of the wing having a span of 25 m, if the Earth’s magnetic field at the locationhas a magnitude of 5 × 10–4 T and the dip angle is 30°.
Answer» A jet plane is travelling towards west at a speed of 1800 km/h. Whatis the voltage difference developed between the ends of the wing having a span of 25 m, if the Earth’s magnetic field at the locationhas a magnitude of 5 × 10–4 T and the dip angle is 30°.

Discussion

Explore topic-wise InterviewSolutions in .

If 1200W mercury lamp emits monochromatic radiation of wavelength 660nm. The number of photons emitted per second is(h=6.6×10^{-34}Js) (1) 2×10^{18} (2) 3×10^{16} (3) 8×10^{16} (4) 4×10^{21

The ratio of energy flux and momentum density

1.how to find spin multiplicity of any subshell For eg , find it for 4d

Find the correct option among the following - [ a→ absorptive power, r→ reflective power, t→ transmissive power ]

A solid cylinder is rolling without slipping on a plane having inclination θ and the coefficient of static friction μ_s. The relation between θ and μ_{s }is 1)†an θ>3μ_s 2)†an θ≤3μ_s 3)†an θ

Apoint charge of 2.0 μC is at the centre of a cubic Gaussiansurface 9.0 cm on edge. What is the net electric flux through thesurface?

A large †an k is filled with water upto a height H.A small hole is made at the base of the †an k.It takes T_1 time to decrease the height of water to H/x\lbrack x>1\rbrack and it takes time T_2 to take out the rest of the water.If T_1=T_2,then the value of x is?

What is the equipotential surface for a two identical point charge system

A particle stays at rest as seen in a frame. We can conclude that

48.A 500 microcoulomb charge at a centre of a square of side 10 cm. Find the work done in moving a charge of 10 microcoulomb between two diagonally opposite points on the square.

Which of the path (I) or (II) of a projectile has more time of flight? Use necessary assumptions. Given H1 = H2

Escape velocity from earth is about 11kms−1. Escape velocity from a planet having twice the radius and same mean density as the earth is.

coversion of 1 Mw power on a new system having basic unit mass , length and time as 10 kg ,1 dm and 1minute respectively is

Two circular current carrying coils of radius 3 cm and 6 cm are having equal magnetic moment. Find the ratio of currents in the loops.

Difference between intrinsic and extrinsic semiconductors.

Remplace les mots soulignés par ' y/en':1. Mets le livre sur la table.2. Donne un bouquet de fleurs à ton ami.3. N'entre pas dans cette salle .4. Ne mange pas de chips .

Two charges( q,m) and (- q ,m) are connected by a massless rod of lenght l and released in a region of uniform electric field as shown .find the maximum speed of the charges

Tea contained in a mug is an example of:

Man A and B come to the middle of a boat which is at rest. Then displacement of the boat (neglecting any kind of friction) will be

The current i in the circuit will be

the unit of length ,velocity and force are doubled.Which of the following is the correct change in the other units? -unit of time is doubled -unit of mass is doubled -unit of momentum is doubled -unit of energy is double

a 200m long train moving with velocity 20m/s overtakes a man running in the same direction in 20 seconds .how long the train will take to overtake the man if he was running in opposite d

A solid cylinder having a radius of 0.4 m, initially rotating (at t=0) with angular velocity ω0=54 rad/s is placed on a rough inclined plane with θ=37∘ having friction coefficient μ=0.5. The time taken by the cylinder to start pure rolling is[Take g=10 m/s2]

Two point charges of magnitude +q and -q are placed at (-d/2,0,0) and (d/2,0,0), respectively. Find the equation of equipotential surface, where the potential is zero.

The dimension of a/b in the equation p=a-t^2/bx,where p is pressure,x is distance and t is time,are:(1) [M^2LT^3](2) [ML^0T^-2](3) [ML^3T^-1](4) [M^0LT^-3]

If 50% energy released during fission would be converted into electrical energy, then the number of fission in a second in a nuclear reactor of 6.4 MW output is[Energy per fission=200 MeV]

Stopping potential for photoelectrons

A block of mass m is placed at the top of a smooth wedge ABC. The wedge is rotated about an axis passing through C as shown in the figure. The value of angular speed ω such that the block at A does not slip on the wedge is

A ball is thrown vertically upward. At the highest point in its path, which of the following statements is correct?

Water flows in a horizontal tube. The pressure of water changes by 600 N m-2between A and B where the areas of cross section are 30 cm2 and 15 cm2 respectively. Find the rate of flow of water through the tube. Given √0.4= 0.63 approx.

79. Assertion: A particle has enough energy to pass from gold foil in Rutherford experiment. Reason:This is due to uniform distribution of mass over the entire atom.

An average emf of 20 V is induced in an inductor when the current in it is changed from 2.5 A in one direction to 5.5 A in the opposite direction, in 0.1 s. Find the self-inductance of the inductor.

what is electron cloud?is it necessary that always we can get a electron in electron cloud?

If the energy absorbed by each X2 molecule of a gas is 3.5% 10-19 J and the bond energy of X2 is 180.6 kJ mol-1 then the kinetic energy per atom will be (1) 2.5 x 10-19 J (3) 2.5 x 10-20 J (2) 5.0 x 10-20 J (4) 1.5x10-19 J

A hollow uncharged spherical conductor has inner radius A and outer radius b. A positive point charge +q is in the cavity at the center of the sphere (Fig. 3.48). Find the potential V( r) everywhere, assuming thatatV=0 at r= infinty

when 4 bar magnets of moments M,2M,3M,4M are arranged to form a square with unlike poles at each corner then resul†an t magnetic moment is

Diameter of a plano-convex lens is 6 cm and thickness at the centre is 3 mm. If speed of light in material of lens is 2×108 m/s, the focal length of the lens is :

In the figure shown above, the output voltage V0 is______V. (Assume op-amps are ideal) 0

A Kundt's tube apparatus has a steel rod of length 1 m clamped at the centre. It is vibrated in its fundamental mode at a frequency of 2600 Hz. The lycopodium powder dispersed in the tube collects into heaps seperates by 6.5 cm. Calculate the speed of sound in air

Two cylindrical wires A and B are of the same material. Their lengths are in the ratio 1:2 and the diameters are in the ratio 2:1. If they are pulled by the same force, then increase in their respective lengths will be in the ratio

THE MAGNITUDE OF CHANGE IN VELOCITY OF A PARTICLE HAVING SPEED V IS V DURING A TIME INTERVAL\bigtriangleup t WHILE MOVING IN A UNIFORM CIRCULAR MOTION THEMAGNITUDE OF AVERAGE FORCE ON THE PARTICLE IS PROPORTIONAL T

Consider a sphere of radius R exposed to radiation of intensity I as shown in figure. If surface of sphere is partially reflecting with reflection coefficient is 0.3, then radiation force experienced is

A bob of mass m=50 kg is suspended from the ceiling of a trolley by a light inextensible string. If the trolley accelerates horizontally, the string makes an angle 30o with the vertical. Find the acceleration of the trolley.

A projectile can have the same range for two angles of projection . If T1 and T2 be the times of flight in the two cases, then what is the initial velocity of projection?

A jet plane is travelling towards west at a speed of 1800 km/h. Whatis the voltage difference developed between the ends of the wing having a span of 25 m, if the Earth’s magnetic field at the locationhas a magnitude of 5 × 10–4 T and the dip angle is 30°.