50278 + Interview Questions in Physics Page 309 InterviewSolution

15401.	A painter of mass 100 kg is raising himself and the crate (such an arrangement is called Bosun's chair) on which he stands as shown. When he pulls the rope the force exerted by him on the crate's floor is 450 N. If the crate weighs 25 kg then, find the acceleration of the system and the tension in the rope.
Answer» A painter of mass $100 kg$ is raising himself and the crate (such an arrangement is called Bosun's chair) on which he stands as shown. When he pulls the rope the force exerted by him on the crate's floor is $450 N$ . If the crate weighs $25 kg$ then, find the acceleration of the system and the tension in the rope.

Discussion

15402.	A particle of mass 2 kg placed at a point experiences a gravitational force of 4 N along positive x-axis. The gravitational field at that point is
Answer» A particle of mass $2 kg$ placed at a point experiences a gravitational force of $4 N$ along positive $x-$ axis. The gravitational field at that point is

Discussion

15403.	Differentiation of the function y=2tanx+x4 is +.
Answer» Differentiation of the function $y = 2 tan x + x^{4}$ is +.

Discussion

15404.	An electric bulb is rated 220 V and 100 W. Power consumed by it operated on 110 V is
Answer» An electric bulb is rated 220 V and 100 W. Power consumed by it operated on 110 V is

Discussion

15405.	The acceleration of a particle moving in a straight line at any time t is given by a=4-2v where v is the speed of particle at any time t the max velocity is?
Answer» The acceleration of a particle moving in a straight line at any time t is given by a=4-2v where v is the speed of particle at any time t the max velocity is?

Discussion

15406.	Two coherent light sources of intensity ratio n are employed in an inteference experiment. The ratio of the intensities of the maxima and minima in the inteference pattern is
Answer» Two coherent light sources of intensity ratio n are employed in an inteference experiment. The ratio of the intensities of the maxima and minima in the inteference pattern is

Discussion

15407.	If →A,→B,→C are mutually perpendicular, show that →C×(→A×→B) = 0 Is the converse true ?
Answer» If $\to A, \to B, \to C$ are mutually perpendicular, show that $\to C \times (\to A \times \to B)$ = 0 Is the converse true ?

Discussion

15408.	A student is standing at a distance of 50 meters from the bus. As soon as the bus starts its motion with an acceleration of 1ms, the student starts running towards the bus with a uniform velocity u. Assuming the motion to be along a straight road, the minimum value of u, so that the student is able to catch the bus is
Answer» A student is standing at a distance of $50$ meters from the bus. As soon as the bus starts its motion with an acceleration of $1 \frac{m}{s},$ the student starts running towards the bus with a uniform velocity $u$ . Assuming the motion to be along a straight road, the minimum value of $u$ , so that the student is able to catch the bus is

Discussion

15409.	46. A uniform disc of mass M and radius R issuspended in vertical plane from a point on itsperiphery. Its time period of oscillation is
Answer» 46. A uniform disc of mass M and radius R issuspended in vertical plane from a point on itsperiphery. Its time period of oscillation is

Discussion

15410.	How the plasma state is able to create electric and electromagnetic fields
Answer» How the plasma state is able to create electric and electromagnetic fields

Discussion

15411.	The area (in sq. units) of the region bounded by the curves x2+2y−1=0, y2+4x−4=0 and y2−4x−4=0, in the upper half plane is
Answer» The area (in sq. units) of the region bounded by the curves $x^{2} + 2 y - 1 = 0, y^{2} + 4 x - 4 = 0 and y^{2} - 4 x - 4 = 0,$ in the upper half plane is

Discussion

15412.	For an electron revolving around Li++ nucleus:
Answer» For an electron revolving around Li++ nucleus:

Discussion

15413.	Show that time constant of R-C circuit has dimensions of time
Answer» Show that time constant of R-C circuit has dimensions of time

Discussion

15414.	Is the formula foraverage velocity x2-x1/t2-t1 or total displacement/total time
Answer» Is the formula foraverage velocity x2-x1/t2-t1 or total displacement/total time

Discussion

15415.	Resistance of a resistor at temperature t∘C is Rt=R0(1+at+bt2); where R0 is the resistance at 0∘C. The temperature coefficient of resistance at temperature t∘C is
Answer» Resistance of a resistor at temperature $t^{\circ} C$ is $R_{t} = R_{0} (1 + a t + b t^{2})$ ; where $R_{0}$ is the resistance at $0^{\circ} C .$ The temperature coefficient of resistance at temperature $t^{\circ} C$ is

Discussion

15416.	N(g) + O+(g) ---> N+(g) + O(g) is the above process spon†an eous?
Answer» N(g) + O+(g) ---> N+(g) + O(g) is the above process spon†an eous?

Discussion

15417.	ntwhy force of attraction is considered -ve and why energy of electron is -ve.n
Answer» ntwhy force of attraction is considered -ve and why energy of electron is -ve.n

Discussion

15418.	A 20 kVA, 400 V, 50 Hz three phase star connected synchronous generator has effective armature resistance and synchronous reactance 0.5 Ω/phase and 3 Ω/phase respectively. Voltage regulation for 0.8 leading power factor at full load_____%(Answer up to 2 decimal places)-10.86
Answer» A 20 kVA, 400 V, 50 Hz three phase star connected synchronous generator has effective armature resistance and synchronous reactance 0.5 $Ω$ /phase and 3 $Ω$ /phase respectively. Voltage regulation for 0.8 leading power factor at full load_____%(Answer up to 2 decimal places) -10.86

Discussion

15419.	A body is moving in a circular path with acceleration a. If its speed gets doubled, find the ratio of acceleration after and before the speed is changed
Answer» A body is moving in a circular path with acceleration $a$ . If its speed gets doubled, find the ratio of acceleration after and before the speed is changed

Discussion

15420.	Velocity (V) versus displacement (S) graph of a particle moving in a straight line is as shown in the figure. Given Vo=4 m/s and So=20 m. Corresponding acceleration (a) versus displacement (S) graph of the particle would be
Answer» Velocity $(V)$ versus displacement $(S)$ graph of a particle moving in a straight line is as shown in the figure. Given $V_{o} = 4 m / s$ and $S_{o} = 20 m .$ Corresponding acceleration $(a)$ versus displacement $(S)$ graph of the particle would be

Discussion

15421.	Calculate the wave number of the wave.
Answer» Calculate the wave number of the wave.

Discussion

15422.	The radius of current carrying coil is R. If fractional decreases in field value with respect to the center of the coil for a nearby axial point is 1%, then find the axial position of that point.[Take, 10.992/3=1.0067]
Answer» The radius of current carrying coil is $R$ . If fractional decreases in field value with respect to the center of the coil for a nearby axial point is $1 %$ , then find the axial position of that point. $[$ Take, $\frac{1}{{0.99}^{2 / 3}} = 1.0067]$

Discussion

15423.	Two identical beakers A and B contain equal volumes of two different liquids at 60∘C each and left to cool down. Liquid in A has density of 8×102 kg/m3 and specific heat of 2000 J kg−1K−1 while liquid in B has density of 103 kg m−3 and specific heat of 4000 J kg−1K−1. Which of the following best describes their temperature versus time graph schematically? (assume the emissivity of both the beakers to be the same?
Answer» Two identical beakers $A$ and $B$ contain equal volumes of two different liquids at $60^{\circ} C$ each and left to cool down. Liquid in $A$ has density of $8 \times 10^{2} k g / m^{3}$ and specific heat of $2000 J k g^{- 1} K^{- 1}$ while liquid in $B$ has density of $10^{3} k g m^{- 3}$ and specific heat of $4000 J k g^{- 1} K^{- 1}$ . Which of the following best describes their temperature versus time graph schematically? (assume the emissivity of both the beakers to be the same?

Discussion

15424.	child sits on school bus and puts his school bag on the floor .the bus accelerates towards east and there is no slipping between bag bus floor . the direction of friction on school bag is towards.
Answer» child sits on school bus and puts his school bag on the floor .the bus accelerates towards east and there is no slipping between bag bus floor . the direction of friction on school bag is towards.

Discussion

15425.	A rigid (AB) of length L=√2 is undergoing translational as well as rotational motion in the x-y plane (see the figure). The point A has the velocity V1=i+2jm/s. The end B is contrained to move only along the x-direction . The magnitude of velocity V2(in m/s) at the end B is.
Answer» A rigid (AB) of length $L = \sqrt{2}$ is undergoing translational as well as rotational motion in the x-y plane (see the figure). The point A has the velocity $V_{1} = i + 2 j m / s$ . The end B is contrained to move only along the x-direction . The magnitude of velocity $V_{2}$ (in m/s) at the end B is.

Discussion

15426.	Under what condition a convex lens when placed in a medium acts as a ordinary glass plate?
Answer» Under what condition a convex lens when placed in a medium acts as a ordinary glass plate?

Discussion

15427.	At room temperature, the rms speed of the molecules of certain diatomic gas is found to be 1930 m/s. The gas is
Answer» At room temperature, the rms speed of the molecules of certain diatomic gas is found to be 1930 m/s. The gas is

Discussion

15428.	Answercarefully:(a) Twolarge conducting spheres carrying charges Q1and Q2are brought close to each other. Is the magnitude of electrostaticforce between them exactly given by Q1Q2/4πr2,where r isthe distance between their centres?(b) IfCoulomb’s law involved 1/r3dependence (instead of 1/r2),would Gauss’s law be still true?(c) A smalltest charge is released at rest at a point in an electrostatic fieldconfiguration. Will it travel along the field line passing throughthat point?(d) What isthe work done by the field of a nucleus in a complete circular orbitof the electron? What if the orbit is elliptical?(e) We knowthat electric field is discontinuous across the surface of a chargedconductor. Is electric potential also discontinuous there?(f) Whatmeaning would you give to the capacitance of a single conductor?(g) Guess apossible reason why water has a much greater dielectric constant (=80) than say, mica (= 6).
Answer» Answer carefully: (a) Two large conducting spheres carrying charges Q₁ and Q₂ are brought close to each other. Is the magnitude of electrostatic force between them exactly given by Q₁ Q₂/4πr ², where r is the distance between their centres? (b) If Coulomb’s law involved 1/r³ dependence (instead of 1/r²), would Gauss’s law be still true? (c) A small test charge is released at rest at a point in an electrostatic field configuration. Will it travel along the field line passing through that point? (d) What is the work done by the field of a nucleus in a complete circular orbit of the electron? What if the orbit is elliptical? (e) We know that electric field is discontinuous across the surface of a charged conductor. Is electric potential also discontinuous there? (f) What meaning would you give to the capacitance of a single conductor? (g) Guess a possible reason why water has a much greater dielectric constant (= 80) than say, mica (= 6).

15428.

Answercarefully:(a) Twolarge conducting spheres carrying charges Q1and Q2are brought close to each other. Is the magnitude of electrostaticforce between them exactly given by Q1Q2/4πr2,where r isthe distance between their centres?(b) IfCoulomb’s law involved 1/r3dependence (instead of 1/r2),would Gauss’s law be still true?(c) A smalltest charge is released at rest at a point in an electrostatic fieldconfiguration. Will it travel along the field line passing throughthat point?(d) What isthe work done by the field of a nucleus in a complete circular orbitof the electron? What if the orbit is elliptical?(e) We knowthat electric field is discontinuous across the surface of a chargedconductor. Is electric potential also discontinuous there?(f) Whatmeaning would you give to the capacitance of a single conductor?(g) Guess apossible reason why water has a much greater dielectric constant (=80) than say, mica (= 6).

Answer»

Answer
carefully:

(a) Two
large conducting spheres carrying charges Q₁
and Q₂
are brought close to each other. Is the magnitude of electrostatic
force between them exactly given by Q₁
Q₂/4πr
²,
where r is
the distance between their centres?

(b) If
Coulomb’s law involved 1/r³
dependence (instead of 1/r²),
would Gauss’s law be still true?

(c) A small
test charge is released at rest at a point in an electrostatic field
configuration. Will it travel along the field line passing through
that point?

(d) What is
the work done by the field of a nucleus in a complete circular orbit
of the electron? What if the orbit is elliptical?

(e) We know
that electric field is discontinuous across the surface of a charged
conductor. Is electric potential also discontinuous there?

(f) What
meaning would you give to the capacitance of a single conductor?

(g) Guess a
possible reason why water has a much greater dielectric constant (=
80) than say, mica (= 6).

Discussion

15429.	A current of 2 ampere flows in a system of conductors as shown in the following figure. The potential difference (VA−VB) will be (in volts):
Answer» A current of $2 ampere$ flows in a system of conductors as shown in the following figure. The potential difference $(V_{A} - V_{B})$ will be (in $volts$ ):

Discussion

15430.	A particle performs SHM given by the equation x=3cosωt+4sinωt. Find the phase constant and amplitude.
Answer» A particle performs SHM given by the equation $x = 3 cos ω t + 4 sin ω t$ . Find the phase constant and amplitude.

Discussion

15431.	The speed of a projectile at its maximum height is 3/2 times of its initial speed 'u' of projection.its range on the horizontal plane is :
Answer» The speed of a projectile at its maximum height is 3/2 times of its initial speed 'u' of projection.its range on the horizontal plane is :

Discussion

15432.	A taxi leaves the station X for station Y every 10 minutes. Simultaneously, a taxi leaves the station Y also for station X every 10 minutes. The taxis move at the same constant speed and go from X to Y or vice-versa in 2 hours. How many taxis coming from the other side will each taxi meet enroute from Y to X.
Answer» A taxi leaves the station X for station Y every 10 minutes. Simultaneously, a taxi leaves the station Y also for station X every 10 minutes. The taxis move at the same constant speed and go from X to Y or vice-versa in 2 hours. How many taxis coming from the other side will each taxi meet enroute from Y to X.

Discussion

15433.	The principle of working of a rocket is based on
Answer» The principle of working of a rocket is based on

Discussion

15434.	A solid spherical conductor of radius R has a spherical cavity of radius a(a
Answer» A solid spherical conductor of radius R has a spherical cavity of radius a(a

Discussion

15435.	The radii of two charged metal spheres are 5 cm and 10 cm both having same charge 75 mC. If they are connected by a wire, the quantity of charge transferred through the wire is
Answer» The radii of two charged metal spheres are 5 cm and 10 cm both having same charge 75 mC. If they are connected by a wire, the quantity of charge transferred through the wire is

Discussion

15436.	Find the work required to rotate the system of charges (+q,−q) connected by rod of mass m and length l by an angle of 180∘.
Answer» Find the work required to rotate the system of charges $(+ q, - q)$ connected by rod of mass $m$ and length $l$ by an angle of $180^{\circ}$ .

Discussion

15437.	What is the total force acting on earth due to the solar radiation? Assume that the earth absorbs all of the incident radiations.Given: radius of earth, R=6400 km, intensity of solar radiations, I=1.5 kW/m2.
Answer» What is the total force acting on earth due to the solar radiation? Assume that the earth absorbs all of the incident radiations. Given: radius of earth, $R = 6400 km$ , intensity of solar radiations, $I = 1.5 {kW/m}^{2}$ .

Discussion

15438.	Two identical pulses whose centres are initially 16 cm apart are moving towards each other on a stretched string with same speed as shown in the figure. After 4 seconds, if the vertical displacement for resultant pulse is zero then the speed of pulses are
Answer» Two identical pulses whose centres are initially $16 cm$ apart are moving towards each other on a stretched string with same speed as shown in the figure. After $4$ seconds, if the vertical displacement for resultant pulse is zero then the speed of pulses are

Discussion

15439.	All formulae of Thermodynamics
Answer» All formulae of Thermodynamics

Discussion

15440.	The potential energy of a 4 kg particle free to move along the x− axis is given by U(x)=x33−5x22+6x+3. Total mechanical energy of the particle is 17 J. Then the maximum kinetic energy is
Answer» The potential energy of a $4 kg$ particle free to move along the $x -$ axis is given by $U (x) = \frac{x^{3}}{3} - \frac{5 x^{2}}{2} + 6 x + 3$ . Total mechanical energy of the particle is $17 J$ . Then the maximum kinetic energy is

Discussion

15441.	A particle of mass m is projected with a velocity v=kve(k<1) from the surface of the earth. (ve= escape velocity). The maximum height above the surface reached by the particle is -R is the radius of earth.
Answer» A particle of mass $m$ is projected with a velocity $v = k v_{e} (k < 1)$ from the surface of the earth. $(v_{e} =$ escape velocity $)$ . The maximum height above the surface reached by the particle is - $R$ is the radius of earth.

Discussion

15442.	What is a Totipontent cell?
Answer» What is a Totipontent cell?

Discussion

15443.	The electric field associated with an electromagnetic wave in vacuum is given by, →E=40cos(kz−6×108t)^i, where all quantities are in SI units. The value of k is -
Answer» The electric field associated with an electromagnetic wave in vacuum is given by, $\to E = 40 cos (k z - 6 \times 10^{8} t)^i$ , where all quantities are in SI units. The value of $k$ is -

Discussion

15444.	A particle executes SHM of amplitude 25 cm and time period 3 s. What is the minimum time required for the particle to move between two points located at 12.5 cm on either side of the mean position.
Answer» A particle executes $SHM$ of amplitude $25 cm$ and time period $3 s$ . What is the minimum time required for the particle to move between two points located at $12.5 cm$ on either side of the mean position.

Discussion

15445.	The surface tension of a liquid is 70 dyne/cm. In MKS system its value is
Answer» The surface tension of a liquid is $70 dyne/cm$ . In MKS system its value is

Discussion

15446.	A car moves with constant tangential acceleration a(t)=0.80m/S2 along a horizontal surface circumscribing a circle of radius R=40m. The coefficient of sliding friction between the wheels of the car and the surface is Meu=0.20. What distance will the car ride without sliding of its initial speed is 0.
Answer» A car moves with constant tangential acceleration a(t)=0.80m/S2 along a horizontal surface circumscribing a circle of radius R=40m. The coefficient of sliding friction between the wheels of the car and the surface is Meu=0.20. What distance will the car ride without sliding of its initial speed is 0.

Discussion

15447.	A charge q is placed at the centre of a conducting spherical shell of radius R, which is given a charge Q. An external charge Q′ is also present at distance R′ (R′>R) from q′. Then the resultant field will be best represented for region r<R is-[where r is the distance of the point from q]
Answer» A charge $q$ is placed at the centre of a conducting spherical shell of radius $R,$ which is given a charge $Q .$ An external charge $Q^{'}$ is also present at distance $R^{'} (R^{'} > R)$ from $q^{'} .$ Then the resultant field will be best represented for region $r < R$ is- [where $r$ is the distance of the point from $q$ ]

Discussion

15448.	A body at rest has mass 10 kg. It is moved by a horizontal force of 5 N on a frictionless horizontal surface. The work done by the force in 8 s is -
Answer» A body at rest has mass $10 kg$ . It is moved by a horizontal force of $5 N$ on a frictionless horizontal surface. The work done by the force in $8 s$ is -

Discussion

15449.	An L-R circuit connected to a battery of a constant emf E. The switch S is closed at time t = 0. If ‘e’ denotes the induced emf across the inductor which of the graphs represents the variation of e with i?
Answer» An L-R circuit connected to a battery of a constant emf E. The switch S is closed at time t = 0. If ‘e’ denotes the induced emf across the inductor which of the graphs represents the variation of e with i?

15449.

An L-R circuit connected to a battery of a constant emf E. The switch S is closed at time t = 0. If ‘e’ denotes the induced emf across the inductor which of the graphs represents the variation of e with i?

Answer»

An L-R circuit connected to a battery of a constant emf E. The switch S is closed at time t = 0. If ‘e’ denotes the induced emf across the inductor which of the graphs represents the variation of e with i?

Discussion

15450.	A vessel contains a small amount of water at 0∘C. If the air in the vessel is rapidly pumped out, it causes freezing of the water. What percentage of the water in the container can be frozen by this method? Latent heat of vaporization and fusion are Lv=540 cal g−1and Lf=80 cal g−1 respectively.
Answer» A vessel contains a small amount of water at $0^{\circ} C$ . If the air in the vessel is rapidly pumped out, it causes freezing of the water. What percentage of the water in the container can be frozen by this method? Latent heat of vaporization and fusion are $L_{v} = 540 {cal g}^{- 1}$ and $L_{f} = 80 {cal g}^{- 1}$ respectively.

Discussion

Explore topic-wise InterviewSolutions in .

A particle of mass 2 kg placed at a point experiences a gravitational force of 4 N along positive x-axis. The gravitational field at that point is

Differentiation of the function y=2tanx+x4 is +.

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The acceleration of a particle moving in a straight line at any time t is given by a=4-2v where v is the speed of particle at any time t the max velocity is?

Two coherent light sources of intensity ratio n are employed in an inteference experiment. The ratio of the intensities of the maxima and minima in the inteference pattern is

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For an electron revolving around Li++ nucleus:

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A 20 kVA, 400 V, 50 Hz three phase star connected synchronous generator has effective armature resistance and synchronous reactance 0.5 Ω/phase and 3 Ω/phase respectively. Voltage regulation for 0.8 leading power factor at full load_____%(Answer up to 2 decimal places)-10.86

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Calculate the wave number of the wave.

The radius of current carrying coil is R. If fractional decreases in field value with respect to the center of the coil for a nearby axial point is 1%, then find the axial position of that point.[Take, 10.992/3=1.0067]

child sits on school bus and puts his school bag on the floor .the bus accelerates towards east and there is no slipping between bag bus floor . the direction of friction on school bag is towards.

A rigid (AB) of length L=√2 is undergoing translational as well as rotational motion in the x-y plane (see the figure). The point A has the velocity V1=i+2jm/s. The end B is contrained to move only along the x-direction . The magnitude of velocity V2(in m/s) at the end B is.

Under what condition a convex lens when placed in a medium acts as a ordinary glass plate?

At room temperature, the rms speed of the molecules of certain diatomic gas is found to be 1930 m/s. The gas is

A current of 2 ampere flows in a system of conductors as shown in the following figure. The potential difference (VA−VB) will be (in volts):

A particle performs SHM given by the equation x=3cosωt+4sinωt. Find the phase constant and amplitude.

The speed of a projectile at its maximum height is 3/2 times of its initial speed 'u' of projection.its range on the horizontal plane is :

The principle of working of a rocket is based on

A solid spherical conductor of radius R has a spherical cavity of radius a(a

The radii of two charged metal spheres are 5 cm and 10 cm both having same charge 75 mC. If they are connected by a wire, the quantity of charge transferred through the wire is

Find the work required to rotate the system of charges (+q,−q) connected by rod of mass m and length l by an angle of 180∘.

What is the total force acting on earth due to the solar radiation? Assume that the earth absorbs all of the incident radiations.Given: radius of earth, R=6400 km, intensity of solar radiations, I=1.5 kW/m2.

Two identical pulses whose centres are initially 16 cm apart are moving towards each other on a stretched string with same speed as shown in the figure. After 4 seconds, if the vertical displacement for resultant pulse is zero then the speed of pulses are

All formulae of Thermodynamics

The potential energy of a 4 kg particle free to move along the x− axis is given by U(x)=x33−5x22+6x+3. Total mechanical energy of the particle is 17 J. Then the maximum kinetic energy is

A particle of mass m is projected with a velocity v=kve(k&lt;1) from the surface of the earth. (ve= escape velocity). The maximum height above the surface reached by the particle is -R is the radius of earth.

What is a Totipontent cell?

The electric field associated with an electromagnetic wave in vacuum is given by, →E=40cos(kz−6×108t)^i, where all quantities are in SI units. The value of k is -

A particle executes SHM of amplitude 25 cm and time period 3 s. What is the minimum time required for the particle to move between two points located at 12.5 cm on either side of the mean position.

The surface tension of a liquid is 70 dyne/cm. In MKS system its value is

A body at rest has mass 10 kg. It is moved by a horizontal force of 5 N on a frictionless horizontal surface. The work done by the force in 8 s is -

An L-R circuit connected to a battery of a constant emf E. The switch S is closed at time t = 0. If ‘e’ denotes the induced emf across the inductor which of the graphs represents the variation of e with i?

A particle of mass m is projected with a velocity v=kve(k<1) from the surface of the earth. (ve= escape velocity). The maximum height above the surface reached by the particle is -R is the radius of earth.