50278 + Interview Questions in Physics Page 247 InterviewSolution

12301.	The position coordinates of a projectile projected from ground on a certain planet (with no atmosphere) are given by y=(4t−2t2) m and x=(3t) m, where t is in second and point of projection is taken as origin. The angle of projection of projectile with vertical is
Answer» The position coordinates of a projectile projected from ground on a certain planet (with no atmosphere) are given by $y = (4 t - 2 t^{2}) m$ and $x = (3 t) m$ , where $t$ is in second and point of projection is taken as origin. The angle of projection of projectile with vertical is

Discussion

12302.	This question is just from my observation. I wachted a movie yesterday ( black p.). In a secne , a bad guy was locked in a room in which there is big glass slab on the wall , the police on 1 side was able to see the man but that man was not. So i want to ask how that " one side transparent glass work " or its just a vfx effect.
Answer» This question is just from my observation. I wachted a movie yesterday ( black p.). In a secne , a bad guy was locked in a room in which there is big glass slab on the wall , the police on 1 side was able to see the man but that man was not. So i want to ask how that " one side transparent glass work " or its just a vfx effect.

Discussion

12303.	Two identical antennas mounted on identical towers are separated from each other by a distance of 45 km. What should nearly be the minimum height of receiving antenna to receive the signals in line of sight? (Assume radius of earth is 6400 km)
Answer» Two identical antennas mounted on identical towers are separated from each other by a distance of $45 km$ . What should nearly be the minimum height of receiving antenna to receive the signals in line of sight? (Assume radius of earth is $6400 km$ )

Discussion

12304.	A steel ball of mass 1 kg is released from rest as shown and strikes a 45∘ inclined surface . If the co-efficient of restitution is 0.8, the distance S, where the ball will strike the horizontal plane at A will be (approximately)
Answer» A steel ball of mass $1 kg$ is released from rest as shown and strikes a $45^{\circ}$ inclined surface . If the co-efficient of restitution is $0.8$ , the distance $S$ , where the ball will strike the horizontal plane at $A$ will be (approximately)

Discussion

12305.	Two particles of mass m is moving in a horizontal circle with same angular speed .If both string are of same length then there ation of tension T1/T2
Answer» Two particles of mass m is moving in a horizontal circle with same angular speed .If both string are of same length then there ation of tension T1/T2

Discussion

12306.	The 20 cm diameter disc in the figure can rotate on the axle through its center. What is the net torque about O (in Nm)?
Answer» The $20 cm$ diameter disc in the figure can rotate on the axle through its center. What is the net torque about $O$ (in $Nm$ )?

Discussion

12307.	Tuning fork A of frequency 258 Hz gives 8 beats tunning fork B. When fork B is filled and again A andB are sounded the number of beats heard remainssame. The frequency of B is
Answer» Tuning fork A of frequency 258 Hz gives 8 beats tunning fork B. When fork B is filled and again A andB are sounded the number of beats heard remainssame. The frequency of B is

Discussion

12308.	A current carrying circular loop is produced a magnetic field of 8 mT on the axis of the loop at a distance of 0.5 m(>>radius of loop) from its centre. The magnetic moment (in Am2) of the given loop will be
Answer» A current carrying circular loop is produced a magnetic field of $8 mT$ on the axis of the loop at a distance of $0.5 m (>> radius of loop)$ from its centre. The magnetic moment (in ${Am}^{2}$ ) of the given loop will be

Discussion

12309.	The de-Broglie wavelength of a particle having kinetic energy E is λ. How much extra energy must be given to this particle so that the de-Broglie wavelength reduces to 75% of the initial value ?
Answer» The de-Broglie wavelength of a particle having kinetic energy E is $λ$ . How much extra energy must be given to this particle so that the de-Broglie wavelength reduces to $75 %$ of the initial value ?

Discussion

12310.	The length of a steel wire when stretched by a force F1 is l1 and when stretched by a force F2 is l2.The unstretched length of the wire is
Answer» The length of a steel wire when stretched by a force $F_{1}$ is $l_{1}$ and when stretched by a force $F_{2}$ is $l_{2}$ .The unstretched length of the wire is

Discussion

12311.	a conducting disc rotating about its axis in a perpendicular magnetic field B. A resistor of resistance R is connected between the Centre and the rim. The radius of the disc is 5.0cm, angular speed w=40 rad/sec, B=0.10T and R=1 ohm. The current through the resistor is (1)5 mA (2)50 A(3)5A (4)10mA
Answer» a conducting disc rotating about its axis in a perpendicular magnetic field B. A resistor of resistance R is connected between the Centre and the rim. The radius of the disc is 5.0cm, angular speed w=40 rad/sec, B=0.10T and R=1 ohm. The current through the resistor is (1)5 mA (2)50 A(3)5A (4)10mA

Discussion

12312.	43.Two conducting spheres radii R1 and R2 are kept widely separated from each other. What are their individual capacitances? If the spheres are connected by a metal wire, what will be the capacitance of the combination?
Answer» 43.Two conducting spheres radii R1 and R2 are kept widely separated from each other. What are their individual capacitances? If the spheres are connected by a metal wire, what will be the capacitance of the combination?

Discussion

12313.	A rod is heated from 0∘C to 10∘C and its length is changed by 0.02%. By what percent does the mass density change?
Answer» A rod is heated from $0^{\circ} C$ to $10^{\circ} C$ and its length is changed by $0.02 %$ . By what percent does the mass density change?

Discussion

12314.	20.Where should an object be placed from an converging lens of focal length 20cm,so as to obtain a real image of magnification 2?
Answer» 20.Where should an object be placed from an converging lens of focal length 20cm,so as to obtain a real image of magnification 2?

Discussion

12315.	a wave travels on a string. equation of wave is y=Asin(wt-kx) it is reflected from heavier string tied to an end of lighter string at x=0 if 36% of incident energy is reflected back then equation of reflected wave is
Answer» a wave travels on a string. equation of wave is y=Asin(wt-kx) it is reflected from heavier string tied to an end of lighter string at x=0 if 36% of incident energy is reflected back then equation of reflected wave is

Discussion

12316.	A particle of mass m carrying -q1 charge is moving around +Q3 charge along a circular. Path of radius r .the period of revolution -q1 is:
Answer» A particle of mass m carrying -q1 charge is moving around +Q3 charge along a circular. Path of radius r .the period of revolution -q1 is:

Discussion

12317.	what is complement mediated cells lysis?
Answer» what is complement mediated cells lysis?

Discussion

12318.	An ideal gas is taken through the cycle A→B→C→A, as shown in the figure. If the net heat supplied to the gas in the cycle is 5 J, the work done by the gas in the process C→A is
Answer» An ideal gas is taken through the cycle $A \to B \to C \to A$ , as shown in the figure. If the net heat supplied to the gas in the cycle is 5 J, the work done by the gas in the process $C \to A$ is

Discussion

12319.	A long solenoid has 200 turns/cm and carries a current I. The magnetic field at its center is 6.28×10−2 Wb/m2. Another long solenoid has 100 turns/cm, and it carries a current I3. The value of magnetic field at its centre is :
Answer» A long solenoid has $200 turns/cm$ and carries a current $I$ . The magnetic field at its center is $6.28 \times 10^{- 2} {Wb/m}^{2}$ . Another long solenoid has $100 turns/cm$ , and it carries a current $\frac{I}{3}$ . The value of magnetic field at its centre is :

Discussion

12320.	60.A body weighted with spring balance in a train at rest, shows a weight W. When the train begins to move with velocity v around the equator from west to east and if the angular velocity of the train is w then the weight shown by spring balance is
Answer» 60.A body weighted with spring balance in a train at rest, shows a weight W. When the train begins to move with velocity v around the equator from west to east and if the angular velocity of the train is w then the weight shown by spring balance is

Discussion

12321.	Two plane mirrors M1 and M2 are inclined at 30∘to the vertical. A point object (O) is placed symmetrically between them at a distance of 4 cm from each mirror. Find the distance of the object from the second image formed in mirror M1.
Answer» Two plane mirrors $M_{1}$ and $M_{2}$ are inclined at $30^{\circ}$ to the vertical. A point object $(O)$ is placed symmetrically between them at a distance of $4 cm$ from each mirror. Find the distance of the object from the second image formed in mirror $M_{1}$ .

Discussion

12322.	18.Find moment of inertia of solid hemisphere about an axis passing through the centre inclined at an angle of 30^° degree with the horizontal diameter
Answer» 18.Find moment of inertia of solid hemisphere about an axis passing through the centre inclined at an angle of 30^° degree with the horizontal diameter

Discussion

12323.	40.A concave lens forms the image of an object such that the distance between the object and the image is 10 cm and magnification produced is 1/4 .fint the focal length of the lens.
Answer» 40.A concave lens forms the image of an object such that the distance between the object and the image is 10 cm and magnification produced is 1/4 .fint the focal length of the lens.

Discussion

12324.	A gas X of molar mass 40 g/mol is found to be 50% dissociated at equilibrium into two gaseousspecies Y and Z with molar masses 26 g/mol and 14 g/mol respectively. Rate of effusion of equilibrium mixture must be(1) Faster than that of CH4 gas under all identical conditions(2) slower than that of CO2 gas under alll identical conditions(3) Faster than that of N2 gas under all identical conditions(4) Slower than that of Ar gas under all identical conditions.
Answer» A gas X of molar mass 40 g/mol is found to be 50% dissociated at equilibrium into two gaseous species Y and Z with molar masses 26 g/mol and 14 g/mol respectively. Rate of effusion of equilibrium mixture must be (1) Faster than that of CH4 gas under all identical conditions (2) slower than that of CO2 gas under alll identical conditions (3) Faster than that of N2 gas under all identical conditions (4) Slower than that of Ar gas under all identical conditions.

Discussion

12325.	If the charge on left plate of the 5 μF capacitor in the circuit segment shown in the figure is −20 μC, then the charge on the right plate of 3 μF capacitor is:
Answer» If the charge on left plate of the $5 μ F$ capacitor in the circuit segment shown in the figure is $- 20 μ C$ , then the charge on the right plate of $3 μ F$ capacitor is:

Discussion

12326.	For a broad gauge railway track on a horizontal curve of radius 'R' (in m) the equilibrium cant 'e' required for a train moving at a speed of V (in km per hour) is
Answer» For a broad gauge railway track on a horizontal curve of radius 'R' (in m) the equilibrium cant 'e' required for a train moving at a speed of V (in km per hour) is

Discussion

12327.	A particle of mass m moves with constant speed v on a circular path of radius r. Find magnitude of average force on it in half revolution.
Answer» A particle of mass m moves with constant speed v on a circular path of radius r. Find magnitude of average force on it in half revolution.

Discussion

12328.	ntIf a, b, c (with vector sign) are non coplanar vectors and r a = r b = r c = 0, show that r is a zero vector.n
Answer» ntIf a, b, c (with vector sign) are non coplanar vectors and r a = r b = r c = 0, show that r is a zero vector.n

Discussion

12329.	What is the meaning of r0 in the formula r=r0*A^1/3 used for the calculation of radius of nucleus?
Answer» What is the meaning of r0 in the formula r=r0*A^1/3 used for the calculation of radius of nucleus?

Discussion

12330.	Two small identical dipoles AB and CD, each having dipole moment of magnitude p are kept at an angle of 120∘ as shown in the figure. If this system is subjected to an uniform electric field of magnitude E directed along +x direction, then the magnitude of torque acting on this is
Answer» Two small identical dipoles $AB$ and $CD$ , each having dipole moment of magnitude $p$ are kept at an angle of $120^{\circ}$ as shown in the figure. If this system is subjected to an uniform electric field of magnitude $E$ directed along $+ x$ direction, then the magnitude of torque acting on this is

Discussion

12331.	why work is a scalar quantity as force and displacement are vectors
Answer» why work is a scalar quantity as force and displacement are vectors

Discussion

12332.	Estimatingthe following two numbers should be interesting. The first numberwill tell you why radio engineers do not need to worry much aboutphotons! The second number tells you why our eye can never ‘countphotons’, even in barely detectable light.(a) The numberof photons emitted per second by a Medium wave transmitter of 10 kWpower, emitting radiowaves of wavelength 500 m.(b) The numberof photons entering the pupil of our eye per second corresponding tothe minimum intensity of white light that we humans can perceive(∼10−10W m−2).Take the area of the pupil to be about 0.4 cm2,and the average frequency of white light to be about 6 × 1014Hz.
Answer» Estimating the following two numbers should be interesting. The first number will tell you why radio engineers do not need to worry much about photons! The second number tells you why our eye can never ‘count photons’, even in barely detectable light. (a) The number of photons emitted per second by a Medium wave transmitter of 10 kW power, emitting radiowaves of wavelength 500 m. (b) The number of photons entering the pupil of our eye per second corresponding to the minimum intensity of white light that we humans can perceive (∼10⁻¹⁰ W m⁻²). Take the area of the pupil to be about 0.4 cm², and the average frequency of white light to be about 6 × 10¹⁴ Hz.

12332.

Estimatingthe following two numbers should be interesting. The first numberwill tell you why radio engineers do not need to worry much aboutphotons! The second number tells you why our eye can never ‘countphotons’, even in barely detectable light.(a) The numberof photons emitted per second by a Medium wave transmitter of 10 kWpower, emitting radiowaves of wavelength 500 m.(b) The numberof photons entering the pupil of our eye per second corresponding tothe minimum intensity of white light that we humans can perceive(∼10−10W m−2).Take the area of the pupil to be about 0.4 cm2,and the average frequency of white light to be about 6 × 1014Hz.

Answer»

Estimating
the following two numbers should be interesting. The first number
will tell you why radio engineers do not need to worry much about
photons! The second number tells you why our eye can never ‘count
photons’, even in barely detectable light.

(a) The number
of photons emitted per second by a Medium wave transmitter of 10 kW
power, emitting radiowaves of wavelength 500 m.

(b) The number
of photons entering the pupil of our eye per second corresponding to
the minimum intensity of white light that we humans can perceive
(∼10⁻¹⁰
W m⁻²).
Take the area of the pupil to be about 0.4 cm²,
and the average frequency of white light to be about 6 × 10¹⁴
Hz.

Discussion

12333.	If the system in the figure is released from rest in the configuration shown, find the velocity of the block Q after it has fallen through a distance 10 meters. Given P=Q=10 kg.
Answer» If the system in the figure is released from rest in the configuration shown, find the velocity of the block $Q$ after it has fallen through a distance $10 meters$ . Given $P = Q = 10 kg$ .

Discussion

12334.	A bus is moving on a straight road with 10m/s along north direction. A man is running on a straight line with 10m/s along west. Calculate the magnitude and direction of velocity of man with respect to an observer in the bus.
Answer» A bus is moving on a straight road with 10m/s along north direction. A man is running on a straight line with 10m/s along west. Calculate the magnitude and direction of velocity of man with respect to an observer in the bus.

Discussion

12335.	In which of the following situations, the transistor is operating in the active region ?
Answer» In which of the following situations, the transistor is operating in the active region ?

Discussion

12336.	a capacitor is connected across a battery which delivers a current o 1 A at an instant in the capacitor . Displacement current through the capacitor at that instant is
Answer» a capacitor is connected across a battery which delivers a current o 1 A at an instant in the capacitor . Displacement current through the capacitor at that instant is

Discussion

12337.	Why only external forces are considered in torque
Answer» Why only external forces are considered in torque

Discussion

12338.	40. ankur and barun are skating on a horizontal road in same direction with velocity va and vb such that Va>Vb. Both are carrying packets of equal masses and they exchanged them sideways when they were at equal positions. How will be the velocities of ankur and barun be related ?
Answer» 40. ankur and barun are skating on a horizontal road in same direction with velocity va and vb such that Va>Vb. Both are carrying packets of equal masses and they exchanged them sideways when they were at equal positions. How will be the velocities of ankur and barun be related ?

Discussion

12339.	Figure shows three identical springs A, B, C. when a 4 kg weight is hung on A, it descends by 1 cm. When a 6kg weight is hung on C, it will descend by
Answer» Figure shows three identical springs A, B, C. when a 4 kg weight is hung on A, it descends by 1 cm. When a 6kg weight is hung on C, it will descend by

Discussion

12340.	A rocket of mass 3000 kg is launched with an exhaust speed of the gas v=50 m/s. What will be the acceleration of the rocket after 3 sec, if the rate of consumption of fuel is 600 kg/s? (Take g=10 m/s2)
Answer» A rocket of mass $3000 kg$ is launched with an exhaust speed of the gas $v = 50 m/s$ . What will be the acceleration of the rocket after $3 s e c$ , if the rate of consumption of fuel is $600 kg/s$ ? (Take $g = 10 {m/s}^{2})$

Discussion

12341.	Consider two masses m1 and m2 are moving in circles of radii r1 and r2 respectively. Their speeds are such that they complete circular motion in the same time t. The ratio of their untripetal acceleration is,
Answer» Consider two masses $m_{1}$ and $m_{2}$ are moving in circles of radii $r_{1}$ and $r_{2}$ respectively. Their speeds are such that they complete circular motion in the same time t. The ratio of their untripetal acceleration is,

Discussion

12342.	A hemispherical earth plate is buried into the earth. Find the potential difference between the feet of a man standing on ground as shown in figure. Current through earth plate is I. Conductivity of earth is [δ=10−3π,I=1A](up to two decimal places)
Answer» A hemispherical earth plate is buried into the earth. Find the potential difference between the feet of a man standing on ground as shown in figure. Current through earth plate is I. Conductivity of earth is [ $δ = 10^{- 3} π, I = 1 A$ ](up to two decimal places)

Discussion

12343.	7.how will the (i) energy stored in the capacitor (ii) the electric field inside the capacitor be affected when it is completely filled with a dielectric material of dielectric constant 'K'?
Answer» 7.how will the (i) energy stored in the capacitor (ii) the electric field inside the capacitor be affected when it is completely filled with a dielectric material of dielectric constant 'K'?

Discussion

12344.	A block of mass 2 kg slides down the face of a smooth 45∘ wedge of mass 9kg as shown in figure. The wedge is placed on a frictionless horizontal surface. Determine the acceleration of the wedge.
Answer» A block of mass 2 kg slides down the face of a smooth $45^{\circ}$ wedge of mass 9kg as shown in figure. The wedge is placed on a frictionless horizontal surface. Determine the acceleration of the wedge.

12344.

A block of mass 2 kg slides down the face of a smooth 45∘ wedge of mass 9kg as shown in figure. The wedge is placed on a frictionless horizontal surface. Determine the acceleration of the wedge.

Answer»

A block of mass 2 kg slides down the face of a smooth $45^{\circ}$ wedge of mass 9kg as shown in figure. The wedge is placed on a frictionless horizontal surface. Determine the acceleration of the wedge.

Discussion

12345.	If equation of projectile is given by ax-bx square. Find speed of projection angle of projection and time of flight.
Answer» If equation of projectile is given by ax-bx square. Find speed of projection angle of projection and time of flight.

Discussion

12346.	4.The smooth rod PR of mass 2 kg is in equilibrium inside a hollow fixed sphere such that angle PQR = 120^° . Find the normal reaction on the rod at end P. Q is the centre of the sphere. (A) 10 N (B) 20 N (C) 10\sqrt{}3 N (D) 20\sqrt{}3 N
Answer» 4.The smooth rod PR of mass 2 kg is in equilibrium inside a hollow fixed sphere such that angle PQR = 120^° . Find the normal reaction on the rod at end P. Q is the centre of the sphere. (A) 10 N (B) 20 N (C) 10\sqrt{}3 N (D) 20\sqrt{}3 N

Discussion

12347.	41.The period of oscillation of a simple pendulum is given by the relation T = 2 pie root under L/g. The measured value of length London and the period of oscillations for 50 oscillations are (20.0 +- 0.1)cm and (45+-1) sec respectively. Find the absolute error in determination of g.
Answer» 41.The period of oscillation of a simple pendulum is given by the relation T = 2 pie root under L/g. The measured value of length London and the period of oscillations for 50 oscillations are (20.0 +- 0.1)cm and (45+-1) sec respectively. Find the absolute error in determination of g.

Discussion

12348.	A band brake consists of a lever attached to one end of the band. The other end of the band is fixed to the ground. The wheel has a radius of 200 mm and the wrap angle of the band is 270∘. The braking force applied to the lever is limited to 100 N, and the coefficient of friction between the band and the wheel is 0.5. No other information is given.The maximum tension that can be generated in the band during braking is
Answer» A band brake consists of a lever attached to one end of the band. The other end of the band is fixed to the ground. The wheel has a radius of $200 m m$ and the wrap angle of the band is $270^{\circ}$ . The braking force applied to the lever is limited to $100 N$ , and the coefficient of friction between the band and the wheel is $0.5$ . No other information is given. The maximum tension that can be generated in the band during braking is

Discussion

12349.	A cylinder of mass 10kg is sliding on a plane with initial velocity 10m/s. If the coefficient of friction between the cylinder and the floor is 0.5, then what dis†an ce will it cover before stopping?
Answer» A cylinder of mass 10kg is sliding on a plane with initial velocity 10m/s. If the coefficient of friction between the cylinder and the floor is 0.5, then what dis†an ce will it cover before stopping?

Discussion

12350.	positive electron gain enthalpy is found in
Answer» positive electron gain enthalpy is found in

Discussion

Explore topic-wise InterviewSolutions in .

The position coordinates of a projectile projected from ground on a certain planet (with no atmosphere) are given by y=(4t−2t2) m and x=(3t) m, where t is in second and point of projection is taken as origin. The angle of projection of projectile with vertical is

Two identical antennas mounted on identical towers are separated from each other by a distance of 45 km. What should nearly be the minimum height of receiving antenna to receive the signals in line of sight? (Assume radius of earth is 6400 km)

A steel ball of mass 1 kg is released from rest as shown and strikes a 45∘ inclined surface . If the co-efficient of restitution is 0.8, the distance S, where the ball will strike the horizontal plane at A will be (approximately)

Two particles of mass m is moving in a horizontal circle with same angular speed .If both string are of same length then there ation of tension T1/T2

The 20 cm diameter disc in the figure can rotate on the axle through its center. What is the net torque about O (in Nm)?

Tuning fork A of frequency 258 Hz gives 8 beats tunning fork B. When fork B is filled and again A andB are sounded the number of beats heard remainssame. The frequency of B is

A current carrying circular loop is produced a magnetic field of 8 mT on the axis of the loop at a distance of 0.5 m(&gt;&gt;radius of loop) from its centre. The magnetic moment (in Am2) of the given loop will be

The de-Broglie wavelength of a particle having kinetic energy E is λ. How much extra energy must be given to this particle so that the de-Broglie wavelength reduces to 75% of the initial value ?

The length of a steel wire when stretched by a force F1 is l1 and when stretched by a force F2 is l2.The unstretched length of the wire is

a conducting disc rotating about its axis in a perpendicular magnetic field B. A resistor of resistance R is connected between the Centre and the rim. The radius of the disc is 5.0cm, angular speed w=40 rad/sec, B=0.10T and R=1 ohm. The current through the resistor is (1)5 mA (2)50 A(3)5A (4)10mA

43.Two conducting spheres radii R1 and R2 are kept widely separated from each other. What are their individual capacitances? If the spheres are connected by a metal wire, what will be the capacitance of the combination?

A rod is heated from 0∘C to 10∘C and its length is changed by 0.02%. By what percent does the mass density change?

20.Where should an object be placed from an converging lens of focal length 20cm,so as to obtain a real image of magnification 2?

a wave travels on a string. equation of wave is y=Asin(wt-kx) it is reflected from heavier string tied to an end of lighter string at x=0 if 36% of incident energy is reflected back then equation of reflected wave is

A particle of mass m carrying -q1 charge is moving around +Q3 charge along a circular. Path of radius r .the period of revolution -q1 is:

what is complement mediated cells lysis?

An ideal gas is taken through the cycle A→B→C→A, as shown in the figure. If the net heat supplied to the gas in the cycle is 5 J, the work done by the gas in the process C→A is

A long solenoid has 200 turns/cm and carries a current I. The magnetic field at its center is 6.28×10−2 Wb/m2. Another long solenoid has 100 turns/cm, and it carries a current I3. The value of magnetic field at its centre is :

60.A body weighted with spring balance in a train at rest, shows a weight W. When the train begins to move with velocity v around the equator from west to east and if the angular velocity of the train is w then the weight shown by spring balance is

Two plane mirrors M1 and M2 are inclined at 30∘to the vertical. A point object (O) is placed symmetrically between them at a distance of 4 cm from each mirror. Find the distance of the object from the second image formed in mirror M1.

18.Find moment of inertia of solid hemisphere about an axis passing through the centre inclined at an angle of 30^° degree with the horizontal diameter

40.A concave lens forms the image of an object such that the distance between the object and the image is 10 cm and magnification produced is 1/4 .fint the focal length of the lens.

If the charge on left plate of the 5 μF capacitor in the circuit segment shown in the figure is −20 μC, then the charge on the right plate of 3 μF capacitor is:

For a broad gauge railway track on a horizontal curve of radius 'R' (in m) the equilibrium cant 'e' required for a train moving at a speed of V (in km per hour) is

A particle of mass m moves with constant speed v on a circular path of radius r. Find magnitude of average force on it in half revolution.

ntIf a, b, c (with vector sign) are non coplanar vectors and r a = r b = r c = 0, show that r is a zero vector.n

What is the meaning of r0 in the formula r=r0*A^1/3 used for the calculation of radius of nucleus?

Two small identical dipoles AB and CD, each having dipole moment of magnitude p are kept at an angle of 120∘ as shown in the figure. If this system is subjected to an uniform electric field of magnitude E directed along +x direction, then the magnitude of torque acting on this is

why work is a scalar quantity as force and displacement are vectors

If the system in the figure is released from rest in the configuration shown, find the velocity of the block Q after it has fallen through a distance 10 meters. Given P=Q=10 kg.

A bus is moving on a straight road with 10m/s along north direction. A man is running on a straight line with 10m/s along west. Calculate the magnitude and direction of velocity of man with respect to an observer in the bus.

In which of the following situations, the transistor is operating in the active region ?

a capacitor is connected across a battery which delivers a current o 1 A at an instant in the capacitor . Displacement current through the capacitor at that instant is

Why only external forces are considered in torque

40. ankur and barun are skating on a horizontal road in same direction with velocity va and vb such that Va>Vb. Both are carrying packets of equal masses and they exchanged them sideways when they were at equal positions. How will be the velocities of ankur and barun be related ?

Figure shows three identical springs A, B, C. when a 4 kg weight is hung on A, it descends by 1 cm. When a 6kg weight is hung on C, it will descend by

A rocket of mass 3000 kg is launched with an exhaust speed of the gas v=50 m/s. What will be the acceleration of the rocket after 3 sec, if the rate of consumption of fuel is 600 kg/s? (Take g=10 m/s2)

Consider two masses m1 and m2 are moving in circles of radii r1 and r2 respectively. Their speeds are such that they complete circular motion in the same time t. The ratio of their untripetal acceleration is,

A hemispherical earth plate is buried into the earth. Find the potential difference between the feet of a man standing on ground as shown in figure. Current through earth plate is I. Conductivity of earth is [δ=10−3π,I=1A](up to two decimal places)

7.how will the (i) energy stored in the capacitor (ii) the electric field inside the capacitor be affected when it is completely filled with a dielectric material of dielectric constant 'K'?

A block of mass 2 kg slides down the face of a smooth 45∘ wedge of mass 9kg as shown in figure. The wedge is placed on a frictionless horizontal surface. Determine the acceleration of the wedge.

If equation of projectile is given by ax-bx square. Find speed of projection angle of projection and time of flight.

4.The smooth rod PR of mass 2 kg is in equilibrium inside a hollow fixed sphere such that angle PQR = 120^° . Find the normal reaction on the rod at end P. Q is the centre of the sphere. (A) 10 N (B) 20 N (C) 10\sqrt{}3 N (D) 20\sqrt{}3 N

41.The period of oscillation of a simple pendulum is given by the relation T = 2 pie root under L/g. The measured value of length London and the period of oscillations for 50 oscillations are (20.0 +- 0.1)cm and (45+-1) sec respectively. Find the absolute error in determination of g.

A cylinder of mass 10kg is sliding on a plane with initial velocity 10m/s. If the coefficient of friction between the cylinder and the floor is 0.5, then what dis†an ce will it cover before stopping?

positive electron gain enthalpy is found in

A current carrying circular loop is produced a magnetic field of 8 mT on the axis of the loop at a distance of 0.5 m(>>radius of loop) from its centre. The magnetic moment (in Am2) of the given loop will be