50278 + Interview Questions in Physics Page 338 InterviewSolution

16851.	47. In an AC circuit , maximum value of voltage is 423 volts. Its effective voltage?
Answer» 47. In an AC circuit , maximum value of voltage is 423 volts. Its effective voltage?

Discussion

16852.	10g of ice cubes at 0 degree Celsius is released in a tumbler containing water having water equivalent = 55g at 40 degree Celsius . Assuming that negligible heat is taken from surroundings , the temperature of water in the tumbler becomes? (L=80cal/g)
Answer» 10g of ice cubes at 0 degree Celsius is released in a tumbler containing water having water equivalent = 55g at 40 degree Celsius . Assuming that negligible heat is taken from surroundings , the temperature of water in the tumbler becomes? (L=80cal/g)

Discussion

16853.	A ray of light is incident on the plane mirror at an angle of incidence of 45 degree. The deviation produced i
Answer» A ray of light is incident on the plane mirror at an angle of incidence of 45 degree. The deviation produced i

Discussion

16854.	The sum of four Integers in A.P. is 24 and their product is 945.find the numbers
Answer» The sum of four Integers in A.P. is 24 and their product is 945.find the numbers

Discussion

16855.	Consider the signal s(t) shown in the figure below:If this signal is applied to its matched filter, then the value of filter output signal at T=3 sec will be _____V.4
Answer» Consider the signal s(t) shown in the figure below: If this signal is applied to its matched filter, then the value of filter output signal at T=3 sec will be _____V. 4

Discussion

16856.	Calculate the rms speed of an ideal monoatomic gas having molecular weight 28gm/mol at 27°C. If the specific heats at constant pressure and volume are respectively 6.3J/mol K and 3.14J/mol K respectively.
Answer» Calculate the rms speed of an ideal monoatomic gas having molecular weight 28gm/mol at 27°C. If the specific heats at constant pressure and volume are respectively 6.3J/mol K and 3.14J/mol K respectively.

Discussion

16857.	7Awater jet, whose cross sectional are is 'a' strikes awall making an angle"θ ' with the normal andrebounds elastically. The velocity of water of density'd' is v. Force exerted on wall is :-(1) 2 avd cose(3) 2 avd cos0(2) 2 av?d sin(4) avd cosf0
Answer» 7Awater jet, whose cross sectional are is 'a' strikes awall making an angle"θ ' with the normal andrebounds elastically. The velocity of water of density'd' is v. Force exerted on wall is :-(1) 2 avd cose(3) 2 avd cos0(2) 2 av?d sin(4) avd cosf0

Discussion

16858.	A particle moves in XY plane such that its position, velocity and acceleration are given by →r=x^i+y^j; →v=vx^i+vy^j; →a=ax^i+ay^j which of the following condition is correct if the particles speed is reducing?
Answer» A particle moves in XY plane such that its position, velocity and acceleration are given by $\to r = x^i + y^j; \to v = v_{x}^i + v_{y}^j; \to a = a_{x}^i + a_{y}^j$ which of the following condition is correct if the particles speed is reducing?

Discussion

16859.	Three thin rods each of length L and mass M are placed along X,Y and Z axes in such a way that one end of each rod is at the origin as shown. The moment of inertia of this system about Z− axis is
Answer» Three thin rods each of length $L$ and mass $M$ are placed along $X, Y$ and $Z$ axes in such a way that one end of each rod is at the origin as shown. The moment of inertia of this system about $Z -$ axis is

Discussion

16860.	a sonometer wire supports a 4kg load and viberates in a fundamental mode with a tunning fork of frequency 416hz what's the length of wire between the bridges is not doubled in order to maintain fundamental mode the load should be changed to
Answer» a sonometer wire supports a 4kg load and viberates in a fundamental mode with a tunning fork of frequency 416hz what's the length of wire between the bridges is not doubled in order to maintain fundamental mode the load should be changed to

Discussion

16861.	an electric bulb is designed to draw a power P0 atvoltage V0 if voltage is V it drawsapower P then
Answer» an electric bulb is designed to draw a power P0 atvoltage V0 if voltage is V it drawsapower P then

Discussion

16862.	A 300 g mass has a velocity of (3^i+4^j)m/s at a certain instant. What is its kinetic energy?
Answer» A 300 g mass has a velocity of $(3^i + 4^j) m / s$ at a certain instant. What is its kinetic energy?

Discussion

16863.	(a) For whatkinetic energy of a neutron will the associated de Broglie wavelengthbe 1.40 × 10−10 m?(b) Also findthe de Broglie wavelength of a neutron, in thermal equilibrium withmatter, having an average kinetic energy of (3/2) kTat 300 K.
Answer» (a) For what kinetic energy of a neutron will the associated de Broglie wavelength be 1.40 × 10⁻¹⁰m? (b) Also find the de Broglie wavelength of a neutron, in thermal equilibrium with matter, having an average kinetic energy of (3/2) kT at 300 K.

16863.

(a) For whatkinetic energy of a neutron will the associated de Broglie wavelengthbe 1.40 × 10−10 m?(b) Also findthe de Broglie wavelength of a neutron, in thermal equilibrium withmatter, having an average kinetic energy of (3/2) kTat 300 K.

Answer»

(a) For what
kinetic energy of a neutron will the associated de Broglie wavelength
be 1.40 × 10⁻¹⁰m?

(b) Also find
the de Broglie wavelength of a neutron, in thermal equilibrium with
matter, having an average kinetic energy of (3/2) kT
at 300 K.

Discussion

16864.	A garden hose having an internal diameter 2.0 cm is conducted to a low sprinkles that consists of an enclosure with 24 holes, each 0.125 cm in diameter. If water in the hose has a speed of 90 cm/s, the speed of water leaving the sprinkle holes is
Answer» A garden hose having an internal diameter $2.0 cm$ is conducted to a low sprinkles that consists of an enclosure with $24 holes$ , each $0.125 cm$ in diameter. If water in the hose has a speed of $90 cm/s,$ the speed of water leaving the sprinkle holes is

Discussion

16865.	If a bar magnet of pole strength m and magnetic moment M is cut equally into 6 parts parallel to its axis and again 5 equal parts perpendicular to its axis, then the pole strength and magnetic moment of each piece respectively:
Answer» If a bar magnet of pole strength $m$ and magnetic moment $M$ is cut equally into $6$ parts parallel to its axis and again $5$ equal parts perpendicular to its axis, then the pole strength and magnetic moment of each piece respectively:

Discussion

16866.	An object is placed at 30 cm in front of the convex lens of focal length 10 cm. Find out the image distance from lens?
Answer» An object is placed at $30 c m$ in front of the convex lens of focal length $10 c m$ . Find out the image distance from lens?

Discussion

16867.	The particle start from rest with constant acceleration the ratio of average velocity to the time average velocity
Answer» The particle start from rest with constant acceleration the ratio of average velocity to the time average velocity

Discussion

16868.	We wish to obtain an erect image of an object, using a concave mirror of focal length 15 cm. What should be the range of distance of the object from the mirror? What is the nature of the image? Is the image larger or smaller than the object? Draw a ray diagram to show the image formation in this case.
Answer» We wish to obtain an erect image of an object, using a concave mirror of focal length 15 cm. What should be the range of distance of the object from the mirror? What is the nature of the image? Is the image larger or smaller than the object? Draw a ray diagram to show the image formation in this case.

Discussion

16869.	a ball falls freely from a height of 45m.When the ball is at a height of 25m,it explodes into 2 equal parts.One of them moves horizontally with a speed of 10m/s.The dis†an ce b/w 2 pieces on the ground is a) 10 m b)20m c) 30m d)40
Answer» a ball falls freely from a height of 45m.When the ball is at a height of 25m,it explodes into 2 equal parts.One of them moves horizontally with a speed of 10m/s.The dis†an ce b/w 2 pieces on the ground is a) 10 m b)20m c) 30m d)40

Discussion

16870.	A gas expands isothermally against constant external pressure of 1 atm from a volume of 10 dm³ to a volume of 20 dm³. In the process, it absorbs 800J of thermal energy from surroundings. Calculate the value of internal energy change.
Answer» A gas expands isothermally against constant external pressure of 1 atm from a volume of 10 dm³ to a volume of 20 dm³. In the process, it absorbs 800J of thermal energy from surroundings. Calculate the value of internal energy change.

Discussion

16871.	The waves used for line-of-sight (LOS communication) is
Answer» The waves used for line-of-sight (LOS communication) is

Discussion

16872.	The distance of a planet from the sun is 5 times the distance between the earth and the sun. The Time period of the planet is:
Answer» The distance of a planet from the sun is $5$ times the distance between the earth and the sun. The Time period of the planet is:

Discussion

16873.	7) A ring and a thin hollow cylinder have the same mas sand radius. If I_r and I_s, represent their moment of inertia about their axes, then relation between them is?
Answer» 7) A ring and a thin hollow cylinder have the same mas sand radius. If I_r and I_s, represent their moment of inertia about their axes, then relation between them is?

Discussion

16874.	The moment of inertia of a uniform semi circular wire of mass m and radius r about an axis passing through its centre of mass and perpendicular to its plane
Answer» The moment of inertia of a uniform semi circular wire of mass m and radius r about an axis passing through its centre of mass and perpendicular to its plane

Discussion

16875.	16.A block of mass 0.05 kg when placed on a rough 15 degree inclined plane slides down without acceleration . The inclination is then increased to 30 degree.what would be the acceleration of the block. Solve it by diagram.
Answer» 16.A block of mass 0.05 kg when placed on a rough 15 degree inclined plane slides down without acceleration . The inclination is then increased to 30 degree.what would be the acceleration of the block. Solve it by diagram.

Discussion

16876.	A 2 V battery is connected across the points A and B as shown in the figure given below. Assuming that the resistance of each diode is zero in forward bias and infinity in reverse bias, the current supplied by the battery when one of the diodes has its positive terminal is connected to A (as shown in figure) is
Answer» A 2 $V$ battery is connected across the points A and B as shown in the figure given below. Assuming that the resistance of each diode is zero in forward bias and infinity in reverse bias, the current supplied by the battery when one of the diodes has its positive terminal is connected to $A$ (as shown in figure) is

Discussion

16877.	A battery of emf 10 V and internal resistance 3 W is connected to aresistor. If the current in the circuit is 0.5 A, what is the resistanceof the resistor? What is the terminal voltage of the battery when thecircuit is closed?
Answer» A battery of emf 10 V and internal resistance 3 W is connected to aresistor. If the current in the circuit is 0.5 A, what is the resistanceof the resistor? What is the terminal voltage of the battery when thecircuit is closed?

Discussion

16878.	If 1015 electrons passed through the body in 0.1 s. Find a) Total charge passed b) Rate of flow of charge
Answer» If $10^{15}$ electrons passed through the body in 0.1 s. Find a) Total charge passed b) Rate of flow of charge

Discussion

16879.	The phase angle between e.m.f. and current in LCR series ac circuit is
Answer» The phase angle between e.m.f. and current in LCR series ac circuit is

Discussion

16880.	Two springs A and B having spring constant KA and KB (KA = 2KB) are stretched by applying force of equal magnitude. If energy stored in spring A is EA then energy stored in B will be
Answer» Two springs A and B having spring constant KA and KB (KA = 2KB) are stretched by applying force of equal magnitude. If energy stored in spring A is EA then energy stored in B will be

Discussion

16881.	ntLatent heat of vaporization of water at 500 K is 10 kcal/mol,calculate Delta U for 3 moles of water at the same temperature:n nt13 kcaln nt-13 kcaln nt27 kcaln nt-27 kcaln
Answer» ntLatent heat of vaporization of water at 500 K is 10 kcal/mol,calculate Delta U for 3 moles of water at the same temperature:n nt13 kcaln nt-13 kcaln nt27 kcaln nt-27 kcaln

Discussion

16882.	3 differences between polar and non polar dielectric.
Answer» 3 differences between polar and non polar dielectric.

Discussion

16883.	Find the second orderderivatives of the function.
Answer» Find the second order derivatives of the function.

16883.

Find the second orderderivatives of the function.

Answer»

Find the second order
derivatives of the function.

Discussion

16884.	The cylindrical tube of spray pump has a cross-section of 10 cm2, one end of which has 50 fine holes each of area 10−8 m2. If liquid flows inside the tube with a speed of 0.3 m/min, find the speed with which the liquid is ejected through the holes.
Answer» The cylindrical tube of spray pump has a cross-section of $10 {cm}^{2}$ , one end of which has $50$ fine holes each of area $10^{- 8} m^{2}$ . If liquid flows inside the tube with a speed of $0.3 m/min$ , find the speed with which the liquid is ejected through the holes.

Discussion

16885.	A force of 10 kN is required to move a workpiece. What is the needed working pressure, if the piston diameter is 100 mm?
Answer» A force of 10 kN is required to move a workpiece. What is the needed working pressure, if the piston diameter is 100 mm?

Discussion

16886.	Two balls A and B are thrown horizontally with speed 5 m/s and 7m/s respectively. If the distance between the two points is 6 m then find the distance A strikes the ground from the base ?
Answer» Two balls A and B are thrown horizontally with speed 5 m/s and 7m/s respectively. If the distance between the two points is 6 m then find the distance A strikes the ground from the base ?

Discussion

16887.	A ball at rest is dropped into a well. The water is at a depth h from the surface. If the speed of sound is c, then the time after which the splash is heard will be
Answer» A ball at rest is dropped into a well. The water is at a depth $h$ from the surface. If the speed of sound is $c$ , then the time after which the splash is heard will be

Discussion

16888.	A solid cylinder of mass 20 kg rotates about its axis with an angular speed of 100 rad/s. The radius of the cylinder is 0.25 m. The kinetic energy associated with the rotation of the cylinder is
Answer» A solid cylinder of mass $20 kg$ rotates about its axis with an angular speed of $100 rad/s$ . The radius of the cylinder is $0.25 m$ . The kinetic energy associated with the rotation of the cylinder is

Discussion

16889.	A pendulum bob of mass M is raised to a heighth and then released. At the bottom of its swing, itpicks up a mass m. To what height will thecombined mass rise?MSM2hm2h(2) (m+M)(1)(m+MmMhmMh(4)(3) (m+M)(m+M)
Answer» A pendulum bob of mass M is raised to a heighth and then released. At the bottom of its swing, itpicks up a mass m. To what height will thecombined mass rise?MSM2hm2h(2) (m+M)(1)(m+MmMhmMh(4)(3) (m+M)(m+M)

Discussion

16890.	If the magnitude of intensity of electric field at a distance x on axial line and at a distance y on equatorial line for a given dipole are equal, then x:y is
Answer» If the magnitude of intensity of electric field at a distance $x$ on axial line and at a distance $y$ on equatorial line for a given dipole are equal, then $x : y$ is

Discussion

16891.	A 70 kg man stands in contact against the inner wall of a hollow cylindrical drum of radius 3 m rotating about its vertical axis with 200 rev/min. The coefficient of friction between the wall and his clothing is 0.15. What is the minimum rotational speed of the cylinder to enable the man to remain stuck to the wall (without falling) when the floor is suddenly removed ?
Answer» A 70 kg man stands in contact against the inner wall of a hollow cylindrical drum of radius 3 m rotating about its vertical axis with 200 rev/min. The coefficient of friction between the wall and his clothing is 0.15. What is the minimum rotational speed of the cylinder to enable the man to remain stuck to the wall (without falling) when the floor is suddenly removed ?

Discussion

16892.	In Young's double slit experiment, how many maximas can be obtained on a screen (including the central maximum) on both sides of the central fringe if λ=2000 Angstrom and d=7000 Angstrom
Answer» In Young's double slit experiment, how many maximas can be obtained on a screen (including the central maximum) on both sides of the central fringe if $λ = 2000$ Angstrom and $d = 7000$ Angstrom

Discussion

16893.	In a series LR circuit, power of 400 W is dissipated from a source of 250 V, 50 Hz. The power factor of the circuit. is 0.8. In order to bring the power factor to unity, a capacitor of value C is added in series to the L and R. Taking the value C as (n3π) μF, then value of n is ________.
Answer» In a series $L R$ circuit, power of $400 W$ is dissipated from a source of $250 V, 50 Hz .$ The power factor of the circuit. is $0.8$ . In order to bring the power factor to unity, a capacitor of value $C$ is added in series to the $L$ and $R$ . Taking the value $C$ as $(\frac{n}{3 π}) μ F,$ then value of $n$ is ________.

Discussion

16894.	In a photoelectric cell, the collector and emitter plates are separated by a distance of 15 cm. The photocell is connected with an ammeter in series. When white light [λ (wavelength) between 400 nm−700 nm] falls on this plate (work function =2.1 eV), a current flows through the ammeter. A magnetic field is now switched on between the plates as shown in the figure. As this field is increased, the current through the ammeter decreases and finally becomes zero. The minimum magnetic field, for which the ammeter current becomes zero, is found to be (0.45×10−5b Tesla, where ‘b′ is close to an integer. Find the value of b. Assume that all the photoelectrons are emitted normally from the emitter.
Answer» In a photoelectric cell, the collector and emitter plates are separated by a distance of $15 cm$ . The photocell is connected with an ammeter in series. When white light [ $λ$ (wavelength) between $400 nm - 700 nm$ ] falls on this plate (work function $= 2.1 eV$ ), a current flows through the ammeter. A magnetic field is now switched on between the plates as shown in the figure. As this field is increased, the current through the ammeter decreases and finally becomes zero. The minimum magnetic field, for which the ammeter current becomes zero, is found to be (0.45 $\times 10^{- 5} b$ Tesla, where $‘ b^{'}$ is close to an integer. Find the value of $b$ . Assume that all the photoelectrons are emitted normally from the emitter.

Discussion

16895.	A bomb is projected with initial velocity 9.8 m/s making 15∘ angle with the horizontal. Bomb explodes into two parts in the mass ratio 1 : 2 at the point where the vertical component of velocity is zero. If the heavier mass falls vertically down, how far on the ground from the projection point will the lighter mass fall?
Answer» A bomb is projected with initial velocity $9.8 m/s$ making $15^{\circ}$ angle with the horizontal. Bomb explodes into two parts in the mass ratio 1 : 2 at the point where the vertical component of velocity is zero. If the heavier mass falls vertically down, how far on the ground from the projection point will the lighter mass fall?

Discussion

16896.	A particle is projected with a velocity v such that its range on horizontal plane is twice the greatest height attained by it. The range of the projectile will be (g is the acceleration due to gravity).
Answer» A particle is projected with a velocity $v$ such that its range on horizontal plane is twice the greatest height attained by it. The range of the projectile will be ( $g$ is the acceleration due to gravity).

Discussion

16897.	9.A planet of mass m moves around the sun of mass M in a circular orbit of radius R with angular speed w. Another planet of mass 2 m moves around the sun in circular orbit of radius 4R with angular speed w' find the ratio of w/w'
Answer» 9.A planet of mass m moves around the sun of mass M in a circular orbit of radius R with angular speed w. Another planet of mass 2 m moves around the sun in circular orbit of radius 4R with angular speed w' find the ratio of w/w'

Discussion

16898.	The first ionization potentials (eV) of Be and B respectively are??How to calculate it?
Answer» The first ionization potentials (eV) of Be and B respectively are??How to calculate it?

Discussion

16899.	20.In a meter bridge experiment, when a nichrome wire is in the right gap, the balancing length is 60cm. When the nichrome wire is uniformly stretched to increase its length by 20% and again connected in the right gap, the new balancing length is nearly.
Answer» 20.In a meter bridge experiment, when a nichrome wire is in the right gap, the balancing length is 60cm. When the nichrome wire is uniformly stretched to increase its length by 20% and again connected in the right gap, the new balancing length is nearly.

Discussion

16900.	Find the acceleration of mass m1 and m2 in the arrangement shown in figure, if mass m2 is twice that of mass m1, and the angle that the inclined plane forms with the horizontal is equal to 30∘. Mass of the pulley and string are negligible and friction is absent everywhere.
Answer» Find the acceleration of mass $m_{1}$ and $m_{2}$ in the arrangement shown in figure, if mass $m_{2}$ is twice that of mass $m_{1}$ , and the angle that the inclined plane forms with the horizontal is equal to $30^{\circ}$ . Mass of the pulley and string are negligible and friction is absent everywhere.

Discussion

Explore topic-wise InterviewSolutions in .

47. In an AC circuit , maximum value of voltage is 423 volts. Its effective voltage?

10g of ice cubes at 0 degree Celsius is released in a tumbler containing water having water equivalent = 55g at 40 degree Celsius . Assuming that negligible heat is taken from surroundings , the temperature of water in the tumbler becomes? (L=80cal/g)

A ray of light is incident on the plane mirror at an angle of incidence of 45 degree. The deviation produced i

The sum of four Integers in A.P. is 24 and their product is 945.find the numbers

Consider the signal s(t) shown in the figure below:If this signal is applied to its matched filter, then the value of filter output signal at T=3 sec will be _____V.4

Calculate the rms speed of an ideal monoatomic gas having molecular weight 28gm/mol at 27°C. If the specific heats at constant pressure and volume are respectively 6.3J/mol K and 3.14J/mol K respectively.

7Awater jet, whose cross sectional are is 'a' strikes awall making an angle"θ ' with the normal andrebounds elastically. The velocity of water of density'd' is v. Force exerted on wall is :-(1) 2 avd cose(3) 2 avd cos0(2) 2 av?d sin(4) avd cosf0

A particle moves in XY plane such that its position, velocity and acceleration are given by →r=x^i+y^j; →v=vx^i+vy^j; →a=ax^i+ay^j which of the following condition is correct if the particles speed is reducing?

Three thin rods each of length L and mass M are placed along X,Y and Z axes in such a way that one end of each rod is at the origin as shown. The moment of inertia of this system about Z− axis is

a sonometer wire supports a 4kg load and viberates in a fundamental mode with a tunning fork of frequency 416hz what's the length of wire between the bridges is not doubled in order to maintain fundamental mode the load should be changed to

an electric bulb is designed to draw a power P0 atvoltage V0 if voltage is V it drawsapower P then

A 300 g mass has a velocity of (3^i+4^j)m/s at a certain instant. What is its kinetic energy?

(a) For whatkinetic energy of a neutron will the associated de Broglie wavelengthbe 1.40 × 10−10 m?(b) Also findthe de Broglie wavelength of a neutron, in thermal equilibrium withmatter, having an average kinetic energy of (3/2) kTat 300 K.

A garden hose having an internal diameter 2.0 cm is conducted to a low sprinkles that consists of an enclosure with 24 holes, each 0.125 cm in diameter. If water in the hose has a speed of 90 cm/s, the speed of water leaving the sprinkle holes is

If a bar magnet of pole strength m and magnetic moment M is cut equally into 6 parts parallel to its axis and again 5 equal parts perpendicular to its axis, then the pole strength and magnetic moment of each piece respectively:

An object is placed at 30 cm in front of the convex lens of focal length 10 cm. Find out the image distance from lens?

The particle start from rest with constant acceleration the ratio of average velocity to the time average velocity

a ball falls freely from a height of 45m.When the ball is at a height of 25m,it explodes into 2 equal parts.One of them moves horizontally with a speed of 10m/s.The dis†an ce b/w 2 pieces on the ground is a) 10 m b)20m c) 30m d)40

A gas expands isothermally against constant external pressure of 1 atm from a volume of 10 dm³ to a volume of 20 dm³. In the process, it absorbs 800J of thermal energy from surroundings. Calculate the value of internal energy change.

The waves used for line-of-sight (LOS communication) is

The distance of a planet from the sun is 5 times the distance between the earth and the sun. The Time period of the planet is:

7) A ring and a thin hollow cylinder have the same mas sand radius. If I_r and I_s, represent their moment of inertia about their axes, then relation between them is?

The moment of inertia of a uniform semi circular wire of mass m and radius r about an axis passing through its centre of mass and perpendicular to its plane

16.A block of mass 0.05 kg when placed on a rough 15 degree inclined plane slides down without acceleration . The inclination is then increased to 30 degree.what would be the acceleration of the block. Solve it by diagram.

A battery of emf 10 V and internal resistance 3 W is connected to aresistor. If the current in the circuit is 0.5 A, what is the resistanceof the resistor? What is the terminal voltage of the battery when thecircuit is closed?

If 1015 electrons passed through the body in 0.1 s. Find a) Total charge passed b) Rate of flow of charge

The phase angle between e.m.f. and current in LCR series ac circuit is

Two springs A and B having spring constant KA and KB (KA = 2KB) are stretched by applying force of equal magnitude. If energy stored in spring A is EA then energy stored in B will be

ntLatent heat of vaporization of water at 500 K is 10 kcal/mol,calculate Delta U for 3 moles of water at the same temperature:n nt13 kcaln nt-13 kcaln nt27 kcaln nt-27 kcaln

3 differences between polar and non polar dielectric.

Find the second orderderivatives of the function.

The cylindrical tube of spray pump has a cross-section of 10 cm2, one end of which has 50 fine holes each of area 10−8 m2. If liquid flows inside the tube with a speed of 0.3 m/min, find the speed with which the liquid is ejected through the holes.

A force of 10 kN is required to move a workpiece. What is the needed working pressure, if the piston diameter is 100 mm?

Two balls A and B are thrown horizontally with speed 5 m/s and 7m/s respectively. If the distance between the two points is 6 m then find the distance A strikes the ground from the base ?

A ball at rest is dropped into a well. The water is at a depth h from the surface. If the speed of sound is c, then the time after which the splash is heard will be

A solid cylinder of mass 20 kg rotates about its axis with an angular speed of 100 rad/s. The radius of the cylinder is 0.25 m. The kinetic energy associated with the rotation of the cylinder is

A pendulum bob of mass M is raised to a heighth and then released. At the bottom of its swing, itpicks up a mass m. To what height will thecombined mass rise?MSM2hm2h(2) (m+M)(1)(m+MmMhmMh(4)(3) (m+M)(m+M)

If the magnitude of intensity of electric field at a distance x on axial line and at a distance y on equatorial line for a given dipole are equal, then x:y is

In Young's double slit experiment, how many maximas can be obtained on a screen (including the central maximum) on both sides of the central fringe if λ=2000 Angstrom and d=7000 Angstrom

In a series LR circuit, power of 400 W is dissipated from a source of 250 V, 50 Hz. The power factor of the circuit. is 0.8. In order to bring the power factor to unity, a capacitor of value C is added in series to the L and R. Taking the value C as (n3π) μF, then value of n is ________.

A particle is projected with a velocity v such that its range on horizontal plane is twice the greatest height attained by it. The range of the projectile will be (g is the acceleration due to gravity).

9.A planet of mass m moves around the sun of mass M in a circular orbit of radius R with angular speed w. Another planet of mass 2 m moves around the sun in circular orbit of radius 4R with angular speed w' find the ratio of w/w'

The first ionization potentials (eV) of Be and B respectively are??How to calculate it?

20.In a meter bridge experiment, when a nichrome wire is in the right gap, the balancing length is 60cm. When the nichrome wire is uniformly stretched to increase its length by 20% and again connected in the right gap, the new balancing length is nearly.

Find the acceleration of mass m1 and m2 in the arrangement shown in figure, if mass m2 is twice that of mass m1, and the angle that the inclined plane forms with the horizontal is equal to 30∘. Mass of the pulley and string are negligible and friction is absent everywhere.