50278 + Interview Questions in Physics Page 296 InterviewSolution

14751.	A point charge is held at the centre of a cylindrical envelope at its axis. If θ=60∘, then find the ratio of electric flux passing through the curved surface of envelope to that of passing through flat surfaces.
Answer» A point charge is held at the centre of a cylindrical envelope at its axis. If $θ = 60^{\circ}$ , then find the ratio of electric flux passing through the curved surface of envelope to that of passing through flat surfaces.

Discussion

14752.	2.9g of a gas at 95 °C occupied the same volume as 0.184 g ofdihydrogen at 17 °C, at the same pressure. What is the molar massof the gas?
Answer» 2.9 g of a gas at 95 °C occupied the same volume as 0.184 g of dihydrogen at 17 °C, at the same pressure. What is the molar mass of the gas?

Discussion

14753.	a particle is executing simple harmonic motion .its max acceleration is alpha and max velocity is beta then its time period of vibration willl be
Answer» a particle is executing simple harmonic motion .its max acceleration is alpha and max velocity is beta then its time period of vibration willl be

Discussion

14754.	In YDSE experiment, the angular width of a fringe formed on a distant screen is0.50. If light of wavelength 7000 A is used in the experiment, then distancebetween slits isOptions0.08 mm0.08 cm0.01 mm0.02 cm
Answer» In YDSE experiment, the angular width of a fringe formed on a distant screen is0.50. If light of wavelength 7000 A is used in the experiment, then distancebetween slits isOptions0.08 mm0.08 cm0.01 mm0.02 cm

Discussion

14755.	77. An object have specific gravity p is hung from massless string. The tension in the string is T. The object is immersed in water so that one half of its volume is submerged. The new tension in the string is ?
Answer» 77. An object have specific gravity p is hung from massless string. The tension in the string is T. The object is immersed in water so that one half of its volume is submerged. The new tension in the string is ?

Discussion

14756.	What is the volume occupied by spheres with radius r in the simple cubic unit cell?
Answer» What is the volume occupied by spheres with radius r in the simple cubic unit cell?

Discussion

14757.	If the deBroglie wavelength of an electron is equal to 10−3 times the wavelength of a photon of frequency 6×1014 Hz, then the speed of an electron is equal to:(Speed of light, c=3×108 ms−1Planck's constant, h=6.63×10−34 JsMass of electron, me=9.1×10−31 kg)
Answer» If the deBroglie wavelength of an electron is equal to $10^{- 3}$ times the wavelength of a photon of frequency $6 \times 10^{14} Hz,$ then the speed of an electron is equal to: $(Speed of light, c = 3 \times 10^{8} {ms}^{- 1} Planck's constant, h = 6.63 \times 10^{- 34} Js Mass of electron, m_{e} = 9.1 \times 10^{- 31} kg)$

Discussion

14758.	Why does the pendulum stop after oscillating for a while?
Answer» Why does the pendulum stop after oscillating for a while?

Discussion

14759.	An object is kept on a smooth inclined plane of height 1 unit and length l units. The horizontal acceleration to be imparted to the inclined plane so that the object is stationary relative to the incline is given by
Answer» An object is kept on a smooth inclined plane of height 1 unit and length $l$ units. The horizontal acceleration to be imparted to the inclined plane so that the object is stationary relative to the incline is given by

Discussion

14760.	No photoelectrons are emitted from a metal if the wavelength of light exceeds 6000 ∘A. The work function of the metal is approximately equal to
Answer» No photoelectrons are emitted from a metal if the wavelength of light exceeds $6000 \circ A$ . The work function of the metal is approximately equal to

Discussion

14761.	Conductivity of 0.12M CuSO_4 solution at 298K is 1.8 x 10^{-2} S cm^{-1}. Calculate its equivalent conductivity.
Answer» Conductivity of 0.12M CuSO_4 solution at 298K is 1.8 x 10^{-2} S cm^{-1}. Calculate its equivalent conductivity.

Discussion

14762.	A conducting wire of length l and cross-section area A is tied between two rigid supports and is vibrating in its fundamental mode with frequency 'f' and amplitude 'a' in a uniform magnetic field 'B' normal to the plane of vibration. The maximum potential difference generated across the wire will be. [B = 2T , f = 100 Hz, L = 1m, a = 5 mm & A=10−4m2](Write upto two digits after the decimal point.)
Answer» A conducting wire of length l and cross-section area A is tied between two rigid supports and is vibrating in its fundamental mode with frequency 'f' and amplitude 'a' in a uniform magnetic field 'B' normal to the plane of vibration. The maximum potential difference generated across the wire will be. [B = 2T , f = 100 Hz, L = 1m, a = 5 mm & $A = 10^{- 4} m^{2}]$ (Write upto two digits after the decimal point.)

Discussion

14763.	A thin semi circular plate of radius R lies in the x-y plane with its centre of curvature at origin.If its area density of mass ,σ-varies with dis†an ce from origin r as kr,(0≤ r≤ R), then the dis†an ce of its centre of mass from the origin is
Answer» A thin semi circular plate of radius R lies in the x-y plane with its centre of curvature at origin.If its area density of mass ,σ-varies with dis†an ce from origin r as kr,(0≤ r≤ R), then the dis†an ce of its centre of mass from the origin is

Discussion

14764.	70.what is the diffrence between nm , nN , AND Nm
Answer» 70.what is the diffrence between nm , nN , AND Nm

Discussion

14765.	A block of mass m is placed on a plank of mass M. The system of block and plank is placed on a smooth horizontal surface. If both block and plank move together under a constant force F then the frictional force between the block(m) and the plank(M) is: _____________(A)FM/(M+m)(B)Fm/(m+M)(C)F(M+m)/m(D)F(M+2m)/(M+m)
Answer» A block of mass m is placed on a plank of mass M. The system of block and plank is placed on a smooth horizontal surface. If both block and plank move together under a constant force F then the frictional force between the block(m) and the plank(M) is: _____________ (A)FM/(M+m) (B)Fm/(m+M) (C)F(M+m)/m (D)F(M+2m)/(M+m)

Discussion

14766.	Two pith balls carrying equal charges are suspended from a comman point by strings of equal length , the equililibrium seperation between them is r. now the strings are rigidly clamped at half the hieght The equililibrium seperation between balls now become
Answer» Two pith balls carrying equal charges are suspended from a comman point by strings of equal length , the equililibrium seperation between them is r. now the strings are rigidly clamped at half the hieght The equililibrium seperation between balls now become

Discussion

14767.	A simple pendulum is being used to determine the value of gravitational acceleration g at a certain place. The length of the pendulum is 25.0 cm and a stop watch with 1 s resolution measures the time taken for 40 oscillations to be 50 s. The accuracy in g is
Answer» A simple pendulum is being used to determine the value of gravitational acceleration $g$ at a certain place. The length of the pendulum is $25.0 cm$ and a stop watch with $1 s$ resolution measures the time taken for $40$ oscillations to be $50 s$ . The accuracy in $g$ is

Discussion

14768.	It is claimed that two cesium clocks, if allowed to run for 100 years, free from any disturbance, may differ by only about 0.02 s. What does this imply for the accuracy of the standard cesium clock in measuring a time-interval of 1 s ?
Answer» It is claimed that two cesium clocks, if allowed to run for 100 years, free from any disturbance, may differ by only about 0.02 s. What does this imply for the accuracy of the standard cesium clock in measuring a time-interval of 1 s ?

Discussion

14769.	A block weighing 200 N is in contact with a level plane whose coefficients of static and kinetic friction are 0.4 and 0.2, respectively. The block is acted upon by a horizontal force (in newton) P=10t, where t denotes the time in seconds. The velocity (in m/s) of the block attained after 10 seconds is
Answer» A block weighing 200 N is in contact with a level plane whose coefficients of static and kinetic friction are 0.4 and 0.2, respectively. The block is acted upon by a horizontal force (in newton) P=10t, where t denotes the time in seconds. The velocity (in m/s) of the block attained after 10 seconds is

Discussion

14770.	77. Assertion-:Average of sinusoidal AC can never be zero over half cycle. Reason-:impedance of inductor does not depend upon frequency
Answer» 77. Assertion-:Average of sinusoidal AC can never be zero over half cycle. Reason-:impedance of inductor does not depend upon frequency

Discussion

14771.	An airoplane flying at a velocity of 600km / h ,dives at an angle of 30with the vertical direction if the sun is vertically above the plane find the velocity of the shadow on the ground?
Answer» An airoplane flying at a velocity of 600km / h ,dives at an angle of 30with the vertical direction if the sun is vertically above the plane find the velocity of the shadow on the ground?

Discussion

14772.	32.The coldest recorded temp of air on Earth is 128 degrees F, occurred on July 21,1983 at vostok, a Russian station in Antarctica. Calculate th speed of sound in air at this temperature
Answer» 32.The coldest recorded temp of air on Earth is 128 degrees F, occurred on July 21,1983 at vostok, a Russian station in Antarctica. Calculate th speed of sound in air at this temperature

Discussion

14773.	A telephone wire of length 200 km has a capacitance of 0.014 μF per km. If it carries an AC of frequency 5 kHz, what should be the value of an inductor required to be connected in series so that the impedance of the circuit is minimum.
Answer» A telephone wire of length $200 km$ has a capacitance of $0.014 μ F$ per $km$ . If it carries an $AC$ of frequency $5 kHz,$ what should be the value of an inductor required to be connected in series so that the impedance of the circuit is minimum.

Discussion

14774.	A water tank standing on the floor has two small holes punched in the vertical wall, one above the other. The holes are 2.4 cm and 7.6 cm above the floor. If the jets of water from the holes hit the floor at the same point, then the height of water in the tank is
Answer» A water tank standing on the floor has two small holes punched in the vertical wall, one above the other. The holes are $2.4 cm$ and $7.6 cm$ above the floor. If the jets of water from the holes hit the floor at the same point, then the height of water in the tank is

Discussion

14775.	An npn transistor circuit has α=0.985. If IC=2 mA, then the value of IB is
Answer» An $npn$ transistor circuit has $α = 0.985.$ If $I_{C} = 2 mA$ , then the value of $I_{B}$ is

Discussion

14776.	The electrical resistance of a mercury column in a cylindrical container is R. When all of the mercury is poured out into another cylindrical container of half the radius of cross section, the resistance of the new mercury column will be ______.
Answer» The electrical resistance of a mercury column in a cylindrical container is $R$ . When all of the mercury is poured out into another cylindrical container of half the radius of cross section, the resistance of the new mercury column will be ______.

Discussion

14777.	In an AC circuit, EMF applied is E=5sinωt due to which a current i=3cosωt flows in the circuit. The average power (in watt) dissipated in the circuit will be
Answer» In an $AC$ circuit, $EMF$ applied is $E = 5 sin ω t$ due to which a current $i = 3 cos ω t$ flows in the circuit. The average power $(in watt)$ dissipated in the circuit will be

Discussion

14778.	Two wooden blocks are moving on smooth horizontal surface such that the mass m remains stationary with respect to the block of mass M as shown. Find the force exerted by the M on m.
Answer» Two wooden blocks are moving on smooth horizontal surface such that the mass $m$ remains stationary with respect to the block of mass $M$ as shown. Find the force exerted by the $M$ on $m$ .

Discussion

14779.	Two identical spring of constant K are connected in series and parallel as shown in figure. A mass m is suspended from them. The ratio of their frequencies of vertical oscillations will be
Answer» Two identical spring of constant K are connected in series and parallel as shown in figure. A mass m is suspended from them. The ratio of their frequencies of vertical oscillations will be

14779.

Two identical spring of constant K are connected in series and parallel as shown in figure. A mass m is suspended from them. The ratio of their frequencies of vertical oscillations will be

Answer»

Two identical spring of constant K are connected in series and parallel as shown in figure. A mass m is suspended from them. The ratio of their frequencies of vertical oscillations will be

Discussion

14780.	25 msThe time takenv by current to reach theEquation of alternating current is given by 10/2sin 100ntroot mean square value from t 0 i8 e ahen the value of ls(2) 2501200(4) 800To(3)200(5 n the AC direuit the current is expressed as 100 sin 200rl In this circuit the current rises from zero topeak value in time12)3004003)200100
Answer» 25 msThe time takenv by current to reach theEquation of alternating current is given by 10/2sin 100ntroot mean square value from t 0 i8 e ahen the value of ls(2) 2501200(4) 800To(3)200(5 n the AC direuit the current is expressed as 100 sin 200rl In this circuit the current rises from zero topeak value in time12)3004003)200100

Discussion

14781.	23 Which of the following property of a proton can change while it moves in a magnetic field? a)Mass b)Speed c)Velocity d)Momentum
Answer» 23 Which of the following property of a proton can change while it moves in a magnetic field? a)Mass b)Speed c)Velocity d)Momentum

Discussion

14782.	Two radioactive nuclei A and B initially contain equal number of radioactive atoms. Source A has a half-life of 1-hour and source B has a half-life of 2-hours. At the end of 2-hours, the ratio of the rate of disintegration of A to that of B is-
Answer» Two radioactive nuclei $A$ and $B$ initially contain equal number of radioactive atoms. Source $A$ has a half-life of $1$ -hour and source $B$ has a half-life of $2$ -hours. At the end of $2$ -hours, the ratio of the rate of disintegration of $A$ to that of $B$ is-

Discussion

14783.	Is the work energy theorem for variable force is applicable for both conservative and non-conservative forces or not?
Answer» Is the work energy theorem for variable force is applicable for both conservative and non-conservative forces or not?

Discussion

14784.	A stone is dropped from the top of a building if it is covered three by fourth of its total length in last second of its earlier than total time of fall is
Answer» A stone is dropped from the top of a building if it is covered three by fourth of its total length in last second of its earlier than total time of fall is

Discussion

14785.	A projectile is thrown with an initial velocity of (x^i+y^j) m/s. If the range of the projectile is double the maximum height reached by it, then
Answer» A projectile is thrown with an initial velocity of $(x^i + y^j) m/s$ . If the range of the projectile is double the maximum height reached by it, then

Discussion

14786.	Two drops of equal radius coalesce to form a bigger drop. What is the ratio of surface energy of the bigger drop to the smaller drop?
Answer» Two drops of equal radius coalesce to form a bigger drop. What is the ratio of surface energy of the bigger drop to the smaller drop?

Discussion

14787.	The correct formula for specific gravity of a substance is
Answer» The correct formula for specific gravity of a substance is

Discussion

14788.	two charges + q and minus to each of the mass M area or revolving in the circle of radius R under mutual electrostatic force find speed of each charge kinetic energy of system potential energy of a system Total energy of a system
Answer» two charges + q and minus to each of the mass M area or revolving in the circle of radius R under mutual electrostatic force find speed of each charge kinetic energy of system potential energy of a system Total energy of a system

Discussion

14789.	34.The equivalent resistance between A and B is ? A)4.5 ohm B)12ohm C)5.4ohm D)20ohm
Answer» 34.The equivalent resistance between A and B is ? A)4.5 ohm B)12ohm C)5.4ohm D)20ohm

Discussion

14790.	In a resonance - column experiment to measure the velocity of sound, the first resonance is obtained at a length l1 and the second resonance at a length l2. Which of the following is (are) correct?
Answer» In a resonance - column experiment to measure the velocity of sound, the first resonance is obtained at a length $l_{1}$ and the second resonance at a length $l_{2}$ . Which of the following is (are) correct?

Discussion

14791.	A body is acted upon by a constant force, then it will have a uniform (1) speed(2) momentum (3) acceleration (4) velocity
Answer» A body is acted upon by a constant force, then it will have a uniform (1) speed (2) momentum (3) acceleration (4) velocity

Discussion

14792.	A solid sphere of radius R has a charge Q distributed in its volume with a charge density ρ=kra, where k and a are constants and r is the distance from its centre. If the electric field at r=R2is18 times that at r = R, find the value of a.
Answer» A solid sphere of radius R has a charge Q distributed in its volume with a charge density $ρ = k r^{a}$ , where k and a are constants and r is the distance from its centre. If the electric field at $r = \frac{R}{2} i s \frac{1}{8}$ times that at r = R, find the value of a.

Discussion

14793.	The maximum speed at which a car can turn round a curve of 40 m radius on a level road is: (Given: coefficient of friction between the tyres and road is 0.5)
Answer» The maximum speed at which a car can turn round a curve of 40 m radius on a level road is: (Given: coefficient of friction between the tyres and road is 0.5)

Discussion

14794.	A block of mass m is connected with another block of mass 2m by a light spring. 2m is connected with a hanging mass 3m by an inextensible light string. At the time of release of block 3m?
Answer» A block of mass m is connected with another block of mass 2m by a light spring. 2m is connected with a hanging mass 3m by an inextensible light string. At the time of release of block 3m?

14794.

A block of mass m is connected with another block of mass 2m by a light spring. 2m is connected with a hanging mass 3m by an inextensible light string. At the time of release of block 3m?

Answer»

A block of mass m is connected with another block of mass 2m by a light spring. 2m is connected with a hanging mass 3m by an inextensible light string. At the time of release of block 3m?

Discussion

14795.	A capacitor of capacitance 12 μF is joined to an AC source of frequency 200 Hz. The rms current in the circuit is 2 A. The rms voltage across the capacitor is
Answer» A capacitor of capacitance $12 μ F$ is joined to an $A C$ source of frequency $200 Hz$ . The $r m s$ current in the circuit is $2 A$ . The $r m s$ voltage across the capacitor is

Discussion

14796.	A nucleus X alpha decays to produce Y. The volume of nucleus Y is nearly 56 times the volume of alpha particle. If the mass number of X is taken as A, the value of A100 is (Write upto two digits after the decimal point)
Answer» A nucleus $X$ alpha decays to produce Y. The volume of nucleus Y is nearly 56 times the volume of alpha particle. If the mass number of X is taken as A, the value of $\frac{A}{100}$ is (Write upto two digits after the decimal point)

Discussion

14797.	A particle is projected from horizontal making an angle 60∘ with initial velocity 40 m/s. Find the time taken to the particle to make angle 45∘ from horizontal.
Answer» A particle is projected from horizontal making an angle $60^{\circ}$ with initial velocity 40 m/s. Find the time taken to the particle to make angle $45^{\circ}$ from horizontal.

Discussion

14798.	What is electric motor and how does it works
Answer» What is electric motor and how does it works

Discussion

14799.	The potential energy of a particle varies with velocity v, as U= AV^3/v+B where A and B are constants. Dimensional formula of A/B
Answer» The potential energy of a particle varies with velocity v, as U= AV^3/v+B where A and B are constants. Dimensional formula of A/B

Discussion

14800.	In a heated tennis match Nadal returns the ball straight to Federer at 40m/s speed. Federer returns the ball straight back to Nadal at 30m/s. Given the mass of ball to be 12 kg, find the impulse with which Federer returned the ball? (1)35 N (2)70 N (3)70 Ns (4)35 Ns
Answer» In a heated tennis match Nadal returns the ball straight to Federer at 40m/s speed. Federer returns the ball straight back to Nadal at 30m/s. Given the mass of ball to be 12 kg, find the impulse with which Federer returned the ball? (1)35 N (2)70 N (3)70 Ns (4)35 Ns

Discussion

Explore topic-wise InterviewSolutions in .

A point charge is held at the centre of a cylindrical envelope at its axis. If θ=60∘, then find the ratio of electric flux passing through the curved surface of envelope to that of passing through flat surfaces.

2.9g of a gas at 95 °C occupied the same volume as 0.184 g ofdihydrogen at 17 °C, at the same pressure. What is the molar massof the gas?

a particle is executing simple harmonic motion .its max acceleration is alpha and max velocity is beta then its time period of vibration willl be

In YDSE experiment, the angular width of a fringe formed on a distant screen is0.50. If light of wavelength 7000 A is used in the experiment, then distancebetween slits isOptions0.08 mm0.08 cm0.01 mm0.02 cm

77. An object have specific gravity p is hung from massless string. The tension in the string is T. The object is immersed in water so that one half of its volume is submerged. The new tension in the string is ?

What is the volume occupied by spheres with radius r in the simple cubic unit cell?

If the deBroglie wavelength of an electron is equal to 10−3 times the wavelength of a photon of frequency 6×1014 Hz, then the speed of an electron is equal to:(Speed of light, c=3×108 ms−1Planck's constant, h=6.63×10−34 JsMass of electron, me=9.1×10−31 kg)

Why does the pendulum stop after oscillating for a while?

An object is kept on a smooth inclined plane of height 1 unit and length l units. The horizontal acceleration to be imparted to the inclined plane so that the object is stationary relative to the incline is given by

No photoelectrons are emitted from a metal if the wavelength of light exceeds 6000 ∘A. The work function of the metal is approximately equal to

Conductivity of 0.12M CuSO_4 solution at 298K is 1.8 x 10^{-2} S cm^{-1}. Calculate its equivalent conductivity.

A thin semi circular plate of radius R lies in the x-y plane with its centre of curvature at origin.If its area density of mass ,σ-varies with dis†an ce from origin r as kr,(0≤ r≤ R), then the dis†an ce of its centre of mass from the origin is

70.what is the diffrence between nm , nN , AND Nm

Two pith balls carrying equal charges are suspended from a comman point by strings of equal length , the equililibrium seperation between them is r. now the strings are rigidly clamped at half the hieght The equililibrium seperation between balls now become

A simple pendulum is being used to determine the value of gravitational acceleration g at a certain place. The length of the pendulum is 25.0 cm and a stop watch with 1 s resolution measures the time taken for 40 oscillations to be 50 s. The accuracy in g is

It is claimed that two cesium clocks, if allowed to run for 100 years, free from any disturbance, may differ by only about 0.02 s. What does this imply for the accuracy of the standard cesium clock in measuring a time-interval of 1 s ?

77. Assertion-:Average of sinusoidal AC can never be zero over half cycle. Reason-:impedance of inductor does not depend upon frequency

An airoplane flying at a velocity of 600km / h ,dives at an angle of 30with the vertical direction if the sun is vertically above the plane find the velocity of the shadow on the ground?​

32.The coldest recorded temp of air on Earth is 128 degrees F, occurred on July 21,1983 at vostok, a Russian station in Antarctica. Calculate th speed of sound in air at this temperature

A telephone wire of length 200 km has a capacitance of 0.014 μF per km. If it carries an AC of frequency 5 kHz, what should be the value of an inductor required to be connected in series so that the impedance of the circuit is minimum.

A water tank standing on the floor has two small holes punched in the vertical wall, one above the other. The holes are 2.4 cm and 7.6 cm above the floor. If the jets of water from the holes hit the floor at the same point, then the height of water in the tank is

An npn transistor circuit has α=0.985. If IC=2 mA, then the value of IB is

The electrical resistance of a mercury column in a cylindrical container is R. When all of the mercury is poured out into another cylindrical container of half the radius of cross section, the resistance of the new mercury column will be ______.

In an AC circuit, EMF applied is E=5sinωt due to which a current i=3cosωt flows in the circuit. The average power (in watt) dissipated in the circuit will be

Two wooden blocks are moving on smooth horizontal surface such that the mass m remains stationary with respect to the block of mass M as shown. Find the force exerted by the M on m.

Two identical spring of constant K are connected in series and parallel as shown in figure. A mass m is suspended from them. The ratio of their frequencies of vertical oscillations will be

23 Which of the following property of a proton can change while it moves in a magnetic field? a)Mass b)Speed c)Velocity d)Momentum

Two radioactive nuclei A and B initially contain equal number of radioactive atoms. Source A has a half-life of 1-hour and source B has a half-life of 2-hours. At the end of 2-hours, the ratio of the rate of disintegration of A to that of B is-

Is the work energy theorem for variable force is applicable for both conservative and non-conservative forces or not?

A stone is dropped from the top of a building if it is covered three by fourth of its total length in last second of its earlier than total time of fall is

A projectile is thrown with an initial velocity of (x^i+y^j) m/s. If the range of the projectile is double the maximum height reached by it, then

Two drops of equal radius coalesce to form a bigger drop. What is the ratio of surface energy of the bigger drop to the smaller drop?

The correct formula for specific gravity of a substance is

two charges + q and minus to each of the mass M area or revolving in the circle of radius R under mutual electrostatic force find speed of each charge kinetic energy of system potential energy of a system Total energy of a system

34.The equivalent resistance between A and B is ? A)4.5 ohm B)12ohm C)5.4ohm D)20ohm

In a resonance - column experiment to measure the velocity of sound, the first resonance is obtained at a length l1 and the second resonance at a length l2. Which of the following is (are) correct?

A body is acted upon by a constant force, then it will have a uniform (1) speed(2) momentum (3) acceleration (4) velocity

A solid sphere of radius R has a charge Q distributed in its volume with a charge density ρ=kra, where k and a are constants and r is the distance from its centre. If the electric field at r=R2is18 times that at r = R, find the value of a.

The maximum speed at which a car can turn round a curve of 40 m radius on a level road is: (Given: coefficient of friction between the tyres and road is 0.5)

A block of mass m is connected with another block of mass 2m by a light spring. 2m is connected with a hanging mass 3m by an inextensible light string. At the time of release of block 3m?

A capacitor of capacitance 12 μF is joined to an AC source of frequency 200 Hz. The rms current in the circuit is 2 A. The rms voltage across the capacitor is

A nucleus X alpha decays to produce Y. The volume of nucleus Y is nearly 56 times the volume of alpha particle. If the mass number of X is taken as A, the value of A100 is (Write upto two digits after the decimal point)

A particle is projected from horizontal making an angle 60∘ with initial velocity 40 m/s. Find the time taken to the particle to make angle 45∘ from horizontal.

What is electric motor and how does it works

The potential energy of a particle varies with velocity v, as U= AV^3/v+B where A and B are constants. Dimensional formula of A/B

In a heated tennis match Nadal returns the ball straight to Federer at 40m/s speed. Federer returns the ball straight back to Nadal at 30m/s. Given the mass of ball to be 12 kg, find the impulse with which Federer returned the ball? (1)35 N (2)70 N (3)70 Ns (4)35 Ns

An airoplane flying at a velocity of 600km / h ,dives at an angle of 30with the vertical direction if the sun is vertically above the plane find the velocity of the shadow on the ground?