50278 + Interview Questions in Physics Page 240 InterviewSolution

11951.	Why was spherical capacitor made, if it has no use?
Answer» Why was spherical capacitor made, if it has no use?

Discussion

11952.	Two masses m1 and m2 (m1>m2) are suspended by two springs vertically and are in equilibrium, extensions in the springs were same. Both the masses are displaced in the vertical direction by same distance and released. In subsequence motion T1,T2 are their periods and E1,E2 are the energies of oscillations respectively then :
Answer» Two masses $m_{1}$ and $m_{2}$ $(m_{1} > m_{2})$ are suspended by two springs vertically and are in equilibrium, extensions in the springs were same. Both the masses are displaced in the vertical direction by same distance and released. In subsequence motion $T_{1}, T_{2}$ are their periods and $E_{1}, E_{2}$ are the energies of oscillations respectively then :

Discussion

11953.	Two particles having mass ratio n:1 (n>1) are interconnected by a light, inextensible string that passes over a smooth pulley. If the system is released, then the acceleration of the centre of mass of the system is(g=acceleration due to gravity)
Answer» Two particles having mass ratio $n : 1 (n > 1)$ are interconnected by a light, inextensible string that passes over a smooth pulley. If the system is released, then the acceleration of the centre of mass of the system is ( $g =$ acceleration due to gravity)

Discussion

11954.	In the given figure, the radius of curvature of curved surface for both the planoconvex and plano-concave lens is 10 cm and refractive index for both is 1.5. The location of the final image from the plano-concave lens after all the refractions through lenses is
Answer» In the given figure, the radius of curvature of curved surface for both the planoconvex and plano-concave lens is 10 cm and refractive index for both is 1.5. The location of the final image from the plano-concave lens after all the refractions through lenses is

11954.

In the given figure, the radius of curvature of curved surface for both the planoconvex and plano-concave lens is 10 cm and refractive index for both is 1.5. The location of the final image from the plano-concave lens after all the refractions through lenses is

Answer»

In the given figure, the radius of curvature of curved surface for both the planoconvex and plano-concave lens is 10 cm and refractive index for both is 1.5. The location of the final image from the plano-concave lens after all the refractions through lenses is

Discussion

11955.	What is magnet field
Answer» What is magnet field

Discussion

11956.	Two motorboats, which can move with velocities 4.0 m/s and 6.0 m/s relative to water are going up-stream. When the faster one overtakes the slower one, a buoy (floating device) is dropped from the slower one. After sometime both the boats turn back simultaneously and move at the same speeds relative to the water as before. Their engines are switched off when they reach the buoy again. If the maximum separation between the boats is 200 m after the buoy is dropped and water flow velocity is 1.5 m/s, find the distance( in metres) travelled by the buoy from the dropping point till the point where the boats meet the buoy again. ___
Answer» Two motorboats, which can move with velocities 4.0 m/s and 6.0 m/s relative to water are going up-stream. When the faster one overtakes the slower one, a buoy (floating device) is dropped from the slower one. After sometime both the boats turn back simultaneously and move at the same speeds relative to the water as before. Their engines are switched off when they reach the buoy again. If the maximum separation between the boats is 200 m after the buoy is dropped and water flow velocity is 1.5 m/s, find the distance( in metres) travelled by the buoy from the dropping point till the point where the boats meet the buoy again. ___

Discussion

11957.	132.A battery of internal resistance 4ohms is connected to the network of resistance as given below. In order to give maximum power to the network the value of R should be
Answer» 132.A battery of internal resistance 4ohms is connected to the network of resistance as given below. In order to give maximum power to the network the value of R should be

Discussion

11958.	The electric field in a certain region is acting radially outward and is given by E=Ar a charge contained in a sphere of radius a centred at the origin of the field will be given by
Answer» The electric field in a certain region is acting radially outward and is given by E=Ar a charge contained in a sphere of radius a centred at the origin of the field will be given by

Discussion

11959.	A paperweight in the form of a hemisphere of radius 3.0 cm is used to hold down a printed page. An observer looks at the page vertically through the paperweight. At what height above the page will the printed letters near the centre appear to the observer ?
Answer» A paperweight in the form of a hemisphere of radius 3.0 cm is used to hold down a printed page. An observer looks at the page vertically through the paperweight. At what height above the page will the printed letters near the centre appear to the observer ?

Discussion

11960.	A rubber cord of a catapult has a cross sectional area 1 mm2 and total unstretched length 10 cm. It is stretched to 12 cm and then released to project a stone of mass 5 gm. Taking Young's Modulus Y for rubber as 5×108 N/m2, the velocity of projection is
Answer» A rubber cord of a catapult has a cross sectional area $1 {mm}^{2}$ and total unstretched length $10 cm$ . It is stretched to $12 cm$ and then released to project a stone of mass $5 gm$ . Taking Young's Modulus $Y$ for rubber as $5 \times 10^{8} {N/m}^{2}$ , the velocity of projection is

Discussion

11961.	In the circuit in figure, if no current flows through the galvanometer when the key is closed, the bridge is balanced. The balancing condition for bridge is.
Answer» In the circuit in figure, if no current flows through the galvanometer when the key is closed, the bridge is balanced. The balancing condition for bridge is.

Discussion

11962.	A proton is accelerating in a cyclotron where the applied magnetic field is 2T if the potential gap is effectively 100 kV then how much revolutions the proton has to make between the dees to acquire kinetic energy of 20MeV
Answer» A proton is accelerating in a cyclotron where the applied magnetic field is 2T if the potential gap is effectively 100 kV then how much revolutions the proton has to make between the dees to acquire kinetic energy of 20MeV

Discussion

11963.	How liquifaction of gases proved the presence of van der Waal's force
Answer» How liquifaction of gases proved the presence of van der Waal's force

Discussion

11964.	a particle of mass m is moving with horizontAL speeed 6m/s collides with another particle of mass M m
Answer» a particle of mass m is moving with horizontAL speeed 6m/s collides with another particle of mass M m<

Discussion

11965.	The ratio of hydraulic stress to the corresponding strain is known as:
Answer» The ratio of hydraulic stress to the corresponding strain is known as:

Discussion

11966.	A point charge q of mass m is suspended vertically by a string of length l. A point dipole of dipole moment →p is now brought towards q from infinity so that the charge moves away. The final equilibrium position of the system including the direction of the dipole, the angles and distances is shown in the figure below. If the work done in bringing the dipole to this position is N×(mgh), where g is the acceleration due to gravity, then the value of N is ____ . (Note that for three coplanar forces keeping a point mass in equilibrium, Fsinθ is the same for all forces, where F is any one of the forces and θ is the angle between the other two forces)
Answer» A point charge $q$ of mass $m$ is suspended vertically by a string of length $l$ . A point dipole of dipole moment $\to p$ is now brought towards $q$ from infinity so that the charge moves away. The final equilibrium position of the system including the direction of the dipole, the angles and distances is shown in the figure below. If the work done in bringing the dipole to this position is $N \times (m g h)$ , where $g$ is the acceleration due to gravity, then the value of $N$ is ____ . (Note that for three coplanar forces keeping a point mass in equilibrium, $\frac{F}{sin θ}$ is the same for all forces, where $F$ is any one of the forces and $θ$ is the angle between the other two forces)

Discussion

11967.	A pulling force of 100 N is acting at an angle of 300 with the horizontal on a body of mass 50 kg placed on a rough horizontal surface. Will the same force cause the body to move if it is a pushing force for the body? If not, what should be the value of the force (acting at the same angle) to cause the body to just move? Take g=10 m/s2.
Answer» A pulling force of $100 N$ is acting at an angle of $30^{0}$ with the horizontal on a body of mass $50 kg$ placed on a rough horizontal surface. Will the same force cause the body to move if it is a pushing force for the body? If not, what should be the value of the force (acting at the same angle) to cause the body to just move? Take $g = 10 {m/s}^{2}$ .

Discussion

11968.	A ball of mass 3M rolls from rest on a smoothflat table towards another ball of mass 2M atrest with a constant velocity 5m/s. When thetwo balls are separated by a distance 6m, theposition of centre of mass from the mass 3M is
Answer» A ball of mass 3M rolls from rest on a smoothflat table towards another ball of mass 2M atrest with a constant velocity 5m/s. When thetwo balls are separated by a distance 6m, theposition of centre of mass from the mass 3M is

Discussion

11969.	A square loop of side a hangs from an insulating hanger of spring balance. The magnetic field of strength B occurs only at the lower edge. It carries a current I. Find the change in the reading of the spring balance if the direction of current is reversed
Answer» A square loop of side $a$ hangs from an insulating hanger of spring balance. The magnetic field of strength $B$ occurs only at the lower edge. It carries a current $I$ . Find the change in the reading of the spring balance if the direction of current is reversed

Discussion

11970.	A car travels first 10 seconds with uniform acceleration of 2 m/s^2 from rest on straight road and then travels with zero acceleration for next 10 seconds.The average speed of entire journey is
Answer» A car travels first 10 seconds with uniform acceleration of 2 m/s^2 from rest on straight road and then travels with zero acceleration for next 10 seconds.The average speed of entire journey is

Discussion

11971.	1.A thin wire of length L and uniform linear mass density p is bent into a circular loop with centre at O. The moment of inertia of the loop along the axis which is tangent to loop.
Answer» 1.A thin wire of length L and uniform linear mass density p is bent into a circular loop with centre at O. The moment of inertia of the loop along the axis which is tangent to loop.

Discussion

11972.	A rod of length L and mass M is acted on by two unequal forces F1 and F2(<F1) as shown in the figure. The tension in the rod at a distance y from the end A is given by:
Answer» A rod of length L and mass M is acted on by two unequal forces $F_{1}$ and $F_{2} (< F_{1})$ as shown in the figure. The tension in the rod at a distance y from the end A is given by:

11972.

A rod of length L and mass M is acted on by two unequal forces F1 and F2(<F1) as shown in the figure. The tension in the rod at a distance y from the end A is given by:

Answer»

A rod of length L and mass M is acted on by two unequal forces $F_{1}$ and $F_{2} (< F_{1})$ as shown in the figure. The tension in the rod at a distance y from the end A is given by:

Discussion

11973.	The displacement versus time graph of a moving body is given below.Which one of the following graphs would represent the velocity versus time graph of the moving body?
Answer» The displacement versus time graph of a moving body is given below. Which one of the following graphs would represent the velocity versus time graph of the moving body?

Discussion

11974.	In a certain region, uniform electric field →E=−E0^k and uniform magnetic field →B=−B0^k are present. At time t=0, a particle of mass m and charge q is given a velocity v=v0^j+v0^k. Find the time when the speed of the particle is minimum.
Answer» In a certain region, uniform electric field $\to E = - E_{0}^k$ and uniform magnetic field $\to B = - B_{0}^k$ are present. At time $t = 0$ , a particle of mass $m$ and charge $q$ is given a velocity $v = v_{0}^j + v_{0}^k$ . Find the time when the speed of the particle is minimum.

Discussion

11975.	10.A body dropped from the top of a tower covers a distance 7x in last second of it's journey where x is the distance covered in first second. How much time does it take to reach the ground?
Answer» 10.A body dropped from the top of a tower covers a distance 7x in last second of it's journey where x is the distance covered in first second. How much time does it take to reach the ground?

Discussion

11976.	What is the relation between induced charge and inducing charge for conductors and dielectrics respectively ?
Answer» What is the relation between induced charge and inducing charge for conductors and dielectrics respectively ?

Discussion

11977.	A very long solenoid of radius R is carrying current I(t)=kte−αt(k>0), as a function of time (t≥0). Counterclockwise current is taken to be positive. A circular conducting coil of radius 2R is placed in the equatorial plane of the solenoid and concentric with the solenoid. The current induced in the outer coil is correctly depicted, as a function of time, by-
Answer» A very long solenoid of radius $R$ is carrying current $I (t) = k t e^{- α t} (k > 0),$ as a function of time $(t \geq 0) .$ Counterclockwise current is taken to be positive. A circular conducting coil of radius $2 R$ is placed in the equatorial plane of the solenoid and concentric with the solenoid. The current induced in the outer coil is correctly depicted, as a function of time, by-

Discussion

11978.	A body is projected up with a velocity equal to 34th of the escape velocity from the surface of the earth. The height it reaches is (Radius of the earth is R) :
Answer» A body is projected up with a velocity equal to $\frac{3}{4} th$ of the escape velocity from the surface of the earth. The height it reaches is (Radius of the earth is R) :

Discussion

11979.	Pick out the only vector quantity in the following list : Temperature, pressure, impulse, time, power, total path length, energy, gravitational potential, coefficient of friction, charge.
Answer» Pick out the only vector quantity in the following list : Temperature, pressure, impulse, time, power, total path length, energy, gravitational potential, coefficient of friction, charge.

Discussion

11980.	Electron and proton are accelerated through one volt of potential difference, the ratio of their wavelengths is equal to:
Answer» Electron and proton are accelerated through one volt of potential difference, the ratio of their wavelengths is equal to:

Discussion

11981.	An electric bulb os rated 220V and 100W.When it os operated om110V,what is rhe pover comsumed?
Answer» An electric bulb os rated 220V and 100W.When it os operated om110V,what is rhe pover comsumed?

Discussion

11982.	A McLeod gauge has a volume of the bulb equal to 100 cm3 and a capillary of diameter 1 mm. Calculate the pressure indicated by a reading of 3 cms. What error would result if the capillary volume is assumed to be negligible compared to the volume of the bulb.2
Answer» A McLeod gauge has a volume of the bulb equal to 100 $c m^{3}$ and a capillary of diameter 1 mm. Calculate the pressure indicated by a reading of 3 cms. What error would result if the capillary volume is assumed to be negligible compared to the volume of the bulb. 2

Discussion

11983.	In a Van de Graaff electrostatic generator a rubber belt of 0.3 m width travels at a velocity of 20m/s. The belt is given a uniform surface charge at lower roller, so it produces a field of 106V/m in its vicinity. Current (in milliamperes) carried by the belt is
Answer» In a Van de Graaff electrostatic generator a rubber belt of 0.3 m width travels at a velocity of 20m/s. The belt is given a uniform surface charge at lower roller, so it produces a field of $10^{6} V / m$ in its vicinity. Current (in milliamperes) carried by the belt is

Discussion

11984.	ntA particle of mass M and charge Q moves with a constant velocity V along the positive X direction. It enters a region containing a uniform magnetic field B directed along the negative Z direction extending from X equal to a to X equal to b. Find out the minimum value of V required so that the particle can just enter the region X greater than b.n
Answer» ntA particle of mass M and charge Q moves with a constant velocity V along the positive X direction. It enters a region containing a uniform magnetic field B directed along the negative Z direction extending from X equal to a to X equal to b. Find out the minimum value of V required so that the particle can just enter the region X greater than b.n

Discussion

11985.	explain:"negative acceleration is not always deceleration." and why does a ball coming down have negative acceleration
Answer» explain:"negative acceleration is not always deceleration." and why does a ball coming down have negative acceleration

Discussion

11986.	A dimensionally consistent relation for the volume Vofa liquid of coefficient of viscosity "η , flowing persecond, through a tube of radius r and length l andhaving a pressure difference Pacross its ends, is6.4(1) V- 8ml(2) V=8Pr48Pm48rTtr
Answer» A dimensionally consistent relation for the volume Vofa liquid of coefficient of viscosity "η , flowing persecond, through a tube of radius r and length l andhaving a pressure difference Pacross its ends, is6.4(1) V- 8ml(2) V=8Pr48Pm48rTtr

Discussion

11987.	a rod of length l stands vertically.when it is released it hits the ground.with how much velocity the upper point of the rod hits the ground?
Answer» a rod of length l stands vertically.when it is released it hits the ground.with how much velocity the upper point of the rod hits the ground?

Discussion

11988.	A solid body starts from rest. Angular acceleration of the body spinning about a stationary axis is given by α=2cosθ (in rad/s2) where θ is the angle of rotation from initial position. Then which of the following graphs correctly represents the variation of angular velocity with respect to θ?
Answer» A solid body starts from rest. Angular acceleration of the body spinning about a stationary axis is given by $α = 2 cos θ$ (in $r a d / s^{2}$ ) where $θ$ is the angle of rotation from initial position. Then which of the following graphs correctly represents the variation of angular velocity with respect to $θ$ ?

Discussion

11989.	A straight tunnel is dug into the earth as shown in figure at a distance b from its centre. A ball of mass m is dropped from one of its ends. The time it takes to reach the other end is approximately
Answer» A straight tunnel is dug into the earth as shown in figure at a distance $b$ from its centre. A ball of mass $m$ is dropped from one of its ends. The time it takes to reach the other end is approximately

Discussion

11990.	A 15 μF capacitor is connected to (220 V, 50 Hz) source. The RMS value of current in the circuit is nearly -
Answer» A $15 μ F$ capacitor is connected to $(220 V$ , $50 Hz)$ source. The RMS value of current in the circuit is nearly -

Discussion

11991.	Evaluate asa limit of a sum.
Answer» Evaluate as a limit of a sum.

Discussion

11992.	An aeroplane can fly at the rate of 500 km/h in still atmosphere (when wind is not blowing). The pilot wishes to fly through the shortest path from A to B. The wind is blowing at the rate of 300 km/h perpendicular to line AB. Find the time taken by the aeroplane to reach the point B which is at a distance of 2000 km from A.
Answer» An aeroplane can fly at the rate of $500 km/h$ in still atmosphere (when wind is not blowing). The pilot wishes to fly through the shortest path from $A$ to $B$ . The wind is blowing at the rate of $300 km/h$ perpendicular to line $A B$ . Find the time taken by the aeroplane to reach the point $B$ which is at a distance of $2000 km$ from $A$ .

Discussion

11993.	Find the electric field at the centre of semicircular ring shown in the figure.
Answer» Find the electric field at the centre of semicircular ring shown in the figure.

Discussion

11994.	An inclined plane rises 1 in 10. If length of the inclined plane is 5 m, find the height of the raised end above the horizontal.
Answer» An inclined plane rises 1 in 10. If length of the inclined plane is 5 $m$ , find the height of the raised end above the horizontal.

Discussion

11995.	The number of turns in primary and secondary windings of a transformer are 1000 and 100 respectively. If 200V dc voltage is impressed across the primary terminals, the voltage across secondary terminals is
Answer» The number of turns in primary and secondary windings of a transformer are 1000 and 100 respectively. If 200V dc voltage is impressed across the primary terminals, the voltage across secondary terminals is

Discussion

11996.	Radius of first orbit of hydrogen is 0.53˙A. The radius in fourth orbit is:
Answer» Radius of first orbit of hydrogen is $0.53 ˙ A$ . The radius in fourth orbit is:

Discussion

11997.	A charge Q is placed at the centre of a closed cube, the flux emitting from any one face of the cube will be
Answer» A charge $Q$ is placed at the centre of a closed cube, the flux emitting from any one face of the cube will be

Discussion

11998.	two particles of mass m,constrained to move along the circumference of a smooth circular hoop of equal mass m,are initially located at opposite ends of a diameter and given equal velocities v .the entire arrangement is located in gravity free space .What will be their velocity just before collision?
Answer» two particles of mass m,constrained to move along the circumference of a smooth circular hoop of equal mass m,are initially located at opposite ends of a diameter and given equal velocities v .the entire arrangement is located in gravity free space .What will be their velocity just before collision?

Discussion

11999.	If the rms speed of oxygen molecules at 0∘C is 160 m/s, find the rms speed of hydrogen molecules at 0∘C.
Answer» If the rms speed of oxygen molecules at $0^{\circ} C$ is $160 m/s$ , find the rms speed of hydrogen molecules at $0^{\circ} C$ .

Discussion

12000.	The wire PQ has mass 0.5 kg, resistance 2 Ω and can slide on the smooth, very long horizontal parallel rails separated by a distance of 1 m. The resistance of the rails is negligible. A uniform magnetic field of magnitude 0.6 T exists in the rectangular region, and a resistance of 3 Ω connects the rails outside the field region. At t=0, the wire PQ is pushed towards the right with a speed v=5 m/s, find the acceleration of the wire at this instant.
Answer» The wire $PQ$ has mass $0.5 kg$ , resistance $2 Ω$ and can slide on the smooth, very long horizontal parallel rails separated by a distance of $1 m$ . The resistance of the rails is negligible. A uniform magnetic field of magnitude $0.6 T$ exists in the rectangular region, and a resistance of $3 Ω$ connects the rails outside the field region. At $t = 0$ , the wire $PQ$ is pushed towards the right with a speed $v = 5 m/s$ , find the acceleration of the wire at this instant.

Discussion

Explore topic-wise InterviewSolutions in .

Why was spherical capacitor made, if it has no use?

Two particles having mass ratio n:1 (n&gt;1) are interconnected by a light, inextensible string that passes over a smooth pulley. If the system is released, then the acceleration of the centre of mass of the system is(g=acceleration due to gravity)

In the given figure, the radius of curvature of curved surface for both the planoconvex and plano-concave lens is 10 cm and refractive index for both is 1.5. The location of the final image from the plano-concave lens after all the refractions through lenses is

What is magnet field

132.A battery of internal resistance 4ohms is connected to the network of resistance as given below. In order to give maximum power to the network the value of R should be

The electric field in a certain region is acting radially outward and is given by E=Ar a charge contained in a sphere of radius a centred at the origin of the field will be given by

A paperweight in the form of a hemisphere of radius 3.0 cm is used to hold down a printed page. An observer looks at the page vertically through the paperweight. At what height above the page will the printed letters near the centre appear to the observer ?

A rubber cord of a catapult has a cross sectional area 1 mm2 and total unstretched length 10 cm. It is stretched to 12 cm and then released to project a stone of mass 5 gm. Taking Young's Modulus Y for rubber as 5×108 N/m2, the velocity of projection is

In the circuit in figure, if no current flows through the galvanometer when the key is closed, the bridge is balanced. The balancing condition for bridge is.

A proton is accelerating in a cyclotron where the applied magnetic field is 2T if the potential gap is effectively 100 kV then how much revolutions the proton has to make between the dees to acquire kinetic energy of 20MeV

How liquifaction of gases proved the presence of van der Waal's force

a particle of mass m is moving with horizontAL speeed 6m/s collides with another particle of mass M m

The ratio of hydraulic stress to the corresponding strain is known as:

A ball of mass 3M rolls from rest on a smoothflat table towards another ball of mass 2M atrest with a constant velocity 5m/s. When thetwo balls are separated by a distance 6m, theposition of centre of mass from the mass 3M is

A square loop of side a hangs from an insulating hanger of spring balance. The magnetic field of strength B occurs only at the lower edge. It carries a current I. Find the change in the reading of the spring balance if the direction of current is reversed

A car travels first 10 seconds with uniform acceleration of 2 m/s^2 from rest on straight road and then travels with zero acceleration for next 10 seconds.The average speed of entire journey is

1.A thin wire of length L and uniform linear mass density p is bent into a circular loop with centre at O. The moment of inertia of the loop along the axis which is tangent to loop.

A rod of length L and mass M is acted on by two unequal forces F1 and F2(&lt;F1) as shown in the figure. The tension in the rod at a distance y from the end A is given by:

The displacement versus time graph of a moving body is given below.Which one of the following graphs would represent the velocity versus time graph of the moving body?

In a certain region, uniform electric field →E=−E0^k and uniform magnetic field →B=−B0^k are present. At time t=0, a particle of mass m and charge q is given a velocity v=v0^j+v0^k. Find the time when the speed of the particle is minimum.

10.A body dropped from the top of a tower covers a distance 7x in last second of it's journey where x is the distance covered in first second. How much time does it take to reach the ground?

What is the relation between induced charge and inducing charge for conductors and dielectrics respectively ?

A body is projected up with a velocity equal to 34th of the escape velocity from the surface of the earth. The height it reaches is (Radius of the earth is R) :

Pick out the only vector quantity in the following list : Temperature, pressure, impulse, time, power, total path length, energy, gravitational potential, coefficient of friction, charge.

Electron and proton are accelerated through one volt of potential difference, the ratio of their wavelengths is equal to:

An electric bulb os rated 220V and 100W.When it os operated om110V,what is rhe pover comsumed?

A McLeod gauge has a volume of the bulb equal to 100 cm3 and a capillary of diameter 1 mm. Calculate the pressure indicated by a reading of 3 cms. What error would result if the capillary volume is assumed to be negligible compared to the volume of the bulb.2

In a Van de Graaff electrostatic generator a rubber belt of 0.3 m width travels at a velocity of 20m/s. The belt is given a uniform surface charge at lower roller, so it produces a field of 106V/m in its vicinity. Current (in milliamperes) carried by the belt is

explain:"negative acceleration is not always deceleration." and why does a ball coming down have negative acceleration

A dimensionally consistent relation for the volume Vofa liquid of coefficient of viscosity "η , flowing persecond, through a tube of radius r and length l andhaving a pressure difference Pacross its ends, is6.4(1) V- 8ml(2) V=8Pr48Pm48rTtr

a rod of length l stands vertically.when it is released it hits the ground.with how much velocity the upper point of the rod hits the ground?

A solid body starts from rest. Angular acceleration of the body spinning about a stationary axis is given by α=2cosθ (in rad/s2) where θ is the angle of rotation from initial position. Then which of the following graphs correctly represents the variation of angular velocity with respect to θ?

A straight tunnel is dug into the earth as shown in figure at a distance b from its centre. A ball of mass m is dropped from one of its ends. The time it takes to reach the other end is approximately

A 15 μF capacitor is connected to (220 V, 50 Hz) source. The RMS value of current in the circuit is nearly -

Evaluate asa limit of a sum.

Find the electric field at the centre of semicircular ring shown in the figure.

An inclined plane rises 1 in 10. If length of the inclined plane is 5 m, find the height of the raised end above the horizontal.

The number of turns in primary and secondary windings of a transformer are 1000 and 100 respectively. If 200V dc voltage is impressed across the primary terminals, the voltage across secondary terminals is

Radius of first orbit of hydrogen is 0.53˙A. The radius in fourth orbit is:

A charge Q is placed at the centre of a closed cube, the flux emitting from any one face of the cube will be

If the rms speed of oxygen molecules at 0∘C is 160 m/s, find the rms speed of hydrogen molecules at 0∘C.

Two particles having mass ratio n:1 (n>1) are interconnected by a light, inextensible string that passes over a smooth pulley. If the system is released, then the acceleration of the centre of mass of the system is(g=acceleration due to gravity)

A rod of length L and mass M is acted on by two unequal forces F1 and F2(<F1) as shown in the figure. The tension in the rod at a distance y from the end A is given by: