50278 + Interview Questions in Physics Page 108 InterviewSolution

5351.	The circuit below is made up using identical light bulbs. The light bulb of maximum brightness among the following will be
Answer» The circuit below is made up using identical light bulbs. The light bulb of maximum brightness among the following will be

Discussion

5352.	A projectile thrown with an initial velocity u has the same range R when the maximum height attained by it is either h1 or h2. Then R, h1 and h2 are related as
Answer» A projectile thrown with an initial velocity $u$ has the same range R when the maximum height attained by it is either $h_{1}$ or $h_{2} .$ Then $R, h_{1}$ and $h_{2}$ are related as

Discussion

5353.	5.Two identical metallic sphere each carries charge q are suspended by silk thread of equal length=L in equilibirium distance between the sphere such that x is much much less than L. Find the charge q .Each sphere start leaking the charge at the rate dq/dt such that the sphere moves toward each other and relative velocity of approach depend upon x is given by V=alpha/underroot x .Find the value of dq/dt Click here to view details:
Answer» 5.Two identical metallic sphere each carries charge q are suspended by silk thread of equal length=L in equilibirium distance between the sphere such that x is much much less than L. Find the charge q .Each sphere start leaking the charge at the rate dq/dt such that the sphere moves toward each other and relative velocity of approach depend upon x is given by V=alpha/underroot x .Find the value of dq/dt Click here to view details:

Discussion

5354.	A proton accelerated by a potential difference V=500 kV moves through a transverse magnetic field B=0.51 T as shown in figure. Then the angle θ through which the proton deviates from the initial direction of its motion is (approximately)
Answer» A proton accelerated by a potential difference $V = 500 kV$ moves through a transverse magnetic field $B = 0.51 T$ as shown in figure. Then the angle $θ$ through which the proton deviates from the initial direction of its motion is (approximately)

Discussion

5355.	One radian is equal to angle of
Answer» One radian is equal to angle of

Discussion

5356.	If weight is 20kgwt and height it is kept is 5meters then what will the potential energy in joules?
Answer» If weight is 20kgwt and height it is kept is 5meters then what will the potential energy in joules?

Discussion

5357.	two busescA and B are at position 50m andv100m from the orgin at time t=0 they start moving in the same direction simul†an eously with uniform velocity of 10m/s2 and 5m/s2 determine the time and position at which A overtake
Answer» two busescA and B are at position 50m andv100m from the orgin at time t=0 they start moving in the same direction simul†an eously with uniform velocity of 10m/s2 and 5m/s2 determine the time and position at which A overtake

Discussion

5358.	A current i = 2 + 3sin(2π103t) is flowing through a resistance of value 4Ω. Heat generated in kilo joules in 3 minutes across the resistance is (Write up to two digits after the decimal point)
Answer» A current i = 2 + 3 $sin (2 π 10^{3} t)$ is flowing through a resistance of value $4 Ω$ . Heat generated in kilo joules in 3 minutes across the resistance is (Write up to two digits after the decimal point)

Discussion

5359.	What causes potential energy in a molecule inside a liquid?
Answer» What causes potential energy in a molecule inside a liquid?

Discussion

5360.	The position x of a particle with respect to time t along x-axis is given by x=9t∧2-t∧3 where x is in metres and t in seconds. What will be the position of this particle when it achieves maximum speed along the + x direction? (1) 24m (2) 32m (3) 54m (4) 81
Answer» The position x of a particle with respect to time t along x-axis is given by x=9t∧2-t∧3 where x is in metres and t in seconds. What will be the position of this particle when it achieves maximum speed along the + x direction? (1) 24m (2) 32m (3) 54m (4) 81

Discussion

5361.	When a ceiling fan is switched off, its angular velocity falls to half, while it makes 36 rotations. How many more rotations will it make, before coming to rest?Assume uniform angular retardation throughout the motion.
Answer» When a ceiling fan is switched off, its angular velocity falls to half, while it makes $36$ rotations. How many more rotations will it make, before coming to rest? Assume uniform angular retardation throughout the motion.

Discussion

5362.	A Box P and a coil Q are connected in series with an 10 V AC source of variable frequency. Box P contains a capacitance of 1 μF in series with a resistance of 32 Ω. Coil Q has a self inductance 4.9 mH and a resistance of 68 Ω. The frequency is adjusted so that the maximum current flows in P and Q. Find the impedance of P and Q at this frequency.
Answer» A Box $P$ and a coil $Q$ are connected in series with an $10 V A C$ source of variable frequency. Box $P$ contains a capacitance of $1 μ F$ in series with a resistance of $32 Ω$ . Coil $Q$ has a self inductance $4.9 mH$ and a resistance of $68 Ω$ . The frequency is adjusted so that the maximum current flows in $P$ and $Q$ . Find the impedance of $P$ and $Q$ at this frequency.

Discussion

5363.	A particle is executing SHM along a straight line. Its velocities at distances x1 and x2 from the mean position are v1 and v2 respectively. Its time period of oscillation is
Answer» A particle is executing SHM along a straight line. Its velocities at distances $x_{1}$ and $x_{2}$ from the mean position are $v_{1}$ and $v_{2}$ respectively. Its time period of oscillation is

Discussion

5364.	Two spring systems have equal mass and spring constants k1 and k2. If the maximum velocities in two systems are equal, then the ratio of amplitude of first to that of second is,
Answer» Two spring systems have equal mass and spring constants $k_{1}$ and $k_{2}$ . If the maximum velocities in two systems are equal, then the ratio of amplitude of first to that of second is,

Discussion

5365.	A body of mass 3 kg is under a force which causes a displacement in it is given by S=tcube/3 (in m). Find the work done by the force in first 2 seconds
Answer» A body of mass 3 kg is under a force which causes a displacement in it is given by S=tcube/3 (in m). Find the work done by the force in first 2 seconds

Discussion

5366.	falling particle in the last second of its fallpasses through 58.86 m. Total time of fall is(1) 5.5 s(2) 6.5 s(3) 7.5 s(4) 8.5 s
Answer» falling particle in the last second of its fallpasses through 58.86 m. Total time of fall is(1) 5.5 s(2) 6.5 s(3) 7.5 s(4) 8.5 s

Discussion

5367.	37. Compute the electric flux in a cubical surface of side 10cm , when change of 5 uC is enclosed by them.
Answer» 37. Compute the electric flux in a cubical surface of side 10cm , when change of 5 uC is enclosed by them.

Discussion

5368.	Work done by frictional force depends upon path taken since it is a non conservative force, but still we use displacement while finding out the work done( by friction) . Why is it so?
Answer» Work done by frictional force depends upon path taken since it is a non conservative force, but still we use displacement while finding out the work done( by friction) . Why is it so?

Discussion

5369.	A parallel plate capacitor is to be designed with a voltage rating1 kV, using a material of dielectric constant 3 and dielectric strengthabout 107 Vm–1. (Dielectric strength is the maximum electric field amaterial can tolerate without breakdown, i.e., without starting toconduct electricity through partial ionisation.) For safety, we shouldlike the field never to exceed, say 10% of the dielectric strength.What minimum area of the plates is required to have a capacitanceof 50 pF?
Answer» A parallel plate capacitor is to be designed with a voltage rating1 kV, using a material of dielectric constant 3 and dielectric strengthabout 107 Vm–1. (Dielectric strength is the maximum electric field amaterial can tolerate without breakdown, i.e., without starting toconduct electricity through partial ionisation.) For safety, we shouldlike the field never to exceed, say 10% of the dielectric strength.What minimum area of the plates is required to have a capacitanceof 50 pF?

Discussion

5370.	an unbanked curved has a radius of 60m The maximium speed at which a car makes a trun if the cofficient of static friction is 0.75 is
Answer» an unbanked curved has a radius of 60m The maximium speed at which a car makes a trun if the cofficient of static friction is 0.75 is

Discussion

5371.	A charge particle (-q) is placed along the axis of uniformly charged fixed ring of radius R. Initially charge is released from its position (2R,0,0), predict its motion. 1) Periodic motion 2) SHM 3) Uniform motion 4) Charge particle does not return to its initial position.
Answer» A charge particle (-q) is placed along the axis of uniformly charged fixed ring of radius R. Initially charge is released from its position (2R,0,0), predict its motion. 1) Periodic motion 2) SHM 3) Uniform motion 4) Charge particle does not return to its initial position.

Discussion

5372.	The magnification of an object placed in front of a convex lens of focal length 20 cm is +2. The image distance is________.
Answer» The magnification of an object placed in front of a convex lens of focal length $20 c m$ is $+ 2$ . The image distance is________.

Discussion

5373.	a ray of light moving along a principal axis is falling on a concave mirror . in which direction it is reflected?
Answer» a ray of light moving along a principal axis is falling on a concave mirror . in which direction it is reflected?

Discussion

5374.	A SONAR system fixed in a submarine operates at a frequency 40.0 kHz. An enemy submarine moves towards the SONAR with a speed of 360 km h¯¹. What is the frequency of sound reflected by the submarine ? Take the speed of sound in water to be 1450 m s¯¹.
Answer» A SONAR system fixed in a submarine operates at a frequency 40.0 kHz. An enemy submarine moves towards the SONAR with a speed of 360 km h¯¹. What is the frequency of sound reflected by the submarine ? Take the speed of sound in water to be 1450 m s¯¹.

Discussion

5375.	If the gravitational potential due to the earth at infinite distance from it is zero, the potential at a point P is −5 J kg−1. Suppose we arbitrarily assume the gravitational potential at infinity to be +10 J kg−1. Then, gravitational potential at P will be
Answer» If the gravitational potential due to the earth at infinite distance from it is zero, the potential at a point $P$ is $- 5 {J kg}^{- 1}$ . Suppose we arbitrarily assume the gravitational potential at infinity to be $+ 10 {J kg}^{- 1}$ . Then, gravitational potential at $P$ will be

Discussion

5376.	88.Twelve capacitors each of capacitance 1 micro farad are connected as shown.the effective capacitance between corners a and b will be
Answer» 88.Twelve capacitors each of capacitance 1 micro farad are connected as shown.the effective capacitance between corners a and b will be

Discussion

5377.	Find the value of cos20.cos40.cos60.cos80 (all angles are in degree measure)
Answer» Find the value of cos20.cos40.cos60.cos80 (all angles are in degree measure)

Discussion

5378.	There is a rec†an gular plate of mass M kg of dimensions(a× b)hinged to wall along a.The plate is held in horizontal position by striking n small balls uniformly each of mass m per unit area per unit time. These are striking in shaded half retion of the plate.The balls are colliding elastically with velocity v.What is v?(It is given n=100;M=3kg;m=0.01 kg;b=2m;a=1m;g=10m/s^{
Answer» There is a rec†an gular plate of mass M kg of dimensions(a× b)hinged to wall along a.The plate is held in horizontal position by striking n small balls uniformly each of mass m per unit area per unit time. These are striking in shaded half retion of the plate.The balls are colliding elastically with velocity v.What is v?(It is given n=100;M=3kg;m=0.01 kg;b=2m;a=1m;g=10m/s^{

Discussion

5379.	A parallel plate air condenser has a capacity of 4 μF. It is filled with two different dielectrics of constants 4 and 6 and they fill the upper and lower halves of the space as shown. The capacity now will be
Answer» A parallel plate air condenser has a capacity of 4 μF. It is filled with two different dielectrics of constants 4 and 6 and they fill the upper and lower halves of the space as shown. The capacity now will be

5379.

A parallel plate air condenser has a capacity of 4 μF. It is filled with two different dielectrics of constants 4 and 6 and they fill the upper and lower halves of the space as shown. The capacity now will be

Answer»

A parallel plate air condenser has a capacity of 4 μF. It is filled with two different dielectrics of constants 4 and 6 and they fill the upper and lower halves of the space as shown. The capacity now will be

Discussion

5380.	One quadrant of a circular disc is removed from the original disc of radius 5 cm. Take reference axes and origin O as shown in the figure. Find the sum of the magnitudes (in cm) of the x and y coordinates of the COM of the new shape. Consider the material to be of uniform density.
Answer» One quadrant of a circular disc is removed from the original disc of radius $5 cm$ . Take reference axes and origin $O$ as shown in the figure. Find the sum of the magnitudes (in $cm$ ) of the $x$ and $y$ coordinates of the $COM$ of the new shape. Consider the material to be of uniform density.

Discussion

5381.	A long solenoid has 200 turns/cm and carries a current i. The magnetic field at its center is 6.28×10−2 T. Another long solenoid has 100 turns/cm and its carries a current i3. The magnitude of the magnetic field at its center is -
Answer» A long solenoid has $200 turns/cm$ and carries a current $i$ . The magnetic field at its center is $6.28 \times 10^{- 2} T$ . Another long solenoid has $100 turns/cm$ and its carries a current $\frac{i}{3}$ . The magnitude of the magnetic field at its center is -

Discussion

5382.	Polarization is the
Answer» Polarization is the

Discussion

5383.	If an electron in hydrogen atom jumps from an orbit of level n = 3 to an orbit of level n = 2, the emitted radiation has a frequency (R = Rydberg constant., C = velocity of light)
Answer» If an electron in hydrogen atom jumps from an orbit of level n = 3 to an orbit of level n = 2, the emitted radiation has a frequency (R = Rydberg constant., C = velocity of light)

Discussion

5384.	A particle of mass m and carrying charge -q1 is moving around charge q2 along circular path radius r .find the period of revolution of the charge -q1??
Answer» A particle of mass m and carrying charge -q1 is moving around charge q2 along circular path radius r .find the period of revolution of the charge -q1??

Discussion

5385.	A body cools from 60 ∘C to 50 ∘C in 10 minutes. If the room temperature is 25 ∘C then the temperature of the body at the end of the next 10 minutes will be
Answer» A body cools from $60^{\circ} C$ to $50^{\circ} C$ in $10$ minutes. If the room temperature is $25^{\circ} C$ then the temperature of the body at the end of the next $10$ minutes will be

Discussion

5386.	X- rays of wavelength 0.140 nm are scattered from a very thin slice of carbon. What will be the wavelength of X- rays scattered at 180∘.
Answer» $X$ - rays of wavelength $0.140 nm$ are scattered from a very thin slice of carbon. What will be the wavelength of $X$ - rays scattered at $180^{\circ}$ .

Discussion

5387.	A boy standing at the top of a tower of 20 m height drops a stone. Assuming g 10 ms-2, the velocity with which it hits the ground is
Answer» A boy standing at the top of a tower of 20 m height drops a stone. Assuming g 10 ms-2, the velocity with which it hits the ground is

Discussion

5388.	A kid of mass 50 kg stands at the edge of a platform of radius 1 m which can be freely rotated about its axis. The moment of inertia of the platform is 0.02 kg-m2. The system is at rest. The kid throws a ball of mass 2 kg horizontally to his friend (friend standing on the ground) in a direction tangential to the rim with a speed 10 m/s as seen by his friend. The angular velocity with which the platform will start rotating in rad/s is
Answer» A kid of mass $50 kg$ stands at the edge of a platform of radius $1 m$ which can be freely rotated about its axis. The moment of inertia of the platform is $0.02 {kg-m}^{2}$ . The system is at rest. The kid throws a ball of mass $2 kg$ horizontally to his friend (friend standing on the ground) in a direction tangential to the rim with a speed $10 m/s$ as seen by his friend. The angular velocity with which the platform will start rotating in $rad/s$ is

Discussion

5389.	If y=sin2θ+cos3θ. Find dydθ.
Answer» If $y = {sin}^{2} θ + {cos}^{3} θ$ . Find $\frac{d y}{d θ}$ .

Discussion

5390.	If a charge q is placed at the centre of the line joining two equal charges Q such that the line system is in equilibrium then the value of q is?
Answer» If a charge q is placed at the centre of the line joining two equal charges Q such that the line system is in equilibrium then the value of q is?

Discussion

5391.	A charge Q is distributed over two concentric hallow sphere of radii r and R (R>R) such that their surface charge densities are equal. Find the potential at the common centre
Answer» A charge Q is distributed over two concentric hallow sphere of radii r and R (R>R) such that their surface charge densities are equal. Find the potential at the common centre

Discussion

5392.	When tuning forks A and B are sounded together, 5 beats per second are heard. The frequency of A is 250 Hz. On loading fork A with wax, 2 beats per second are produced with fork B. The frequency of fork B is -
Answer» When tuning forks $A$ and $B$ are sounded together, $5$ beats per second are heard. The frequency of $A$ is $250 Hz$ . On loading fork $A$ with wax, $2$ beats per second are produced with fork $B$ . The frequency of fork $B$ is -

Discussion

5393.	In the circuit shown R1=R2=10 Ω and resistance per unit length of wire PQ = 1 Ω/cm and length PQ = 10 cm. If R2 is made 20 Ω then to get zero deflection in galvanometer. S is midpoint of wire PQ:-
Answer» In the circuit shown $R_{1} = R_{2} = 10 Ω$ and resistance per unit length of wire PQ = $1 Ω$ /cm and length PQ = 10 cm. If $R_{2}$ is made $20 Ω$ then to get zero deflection in galvanometer. S is midpoint of wire PQ:-

Discussion

5394.	Tungsten has atomic radius 0.136nm . the density of tungsten is 19.4g/cmcube. what is the crystal struture of tungsten how a is caculated supossing that a is bcc
Answer» Tungsten has atomic radius 0.136nm . the density of tungsten is 19.4g/cmcube. what is the crystal struture of tungsten how a is caculated supossing that a is bcc

Discussion

5395.	the resistance of moving coil galvanometer is 195ohm and its FSD current is 100mA .the resistance required to be connected to convert it into ammeter of range 4A is
Answer» the resistance of moving coil galvanometer is 195ohm and its FSD current is 100mA .the resistance required to be connected to convert it into ammeter of range 4A is

Discussion

5396.	A parallel plate capacitor of capacitance C is charged to a potential V and then disconnected from the battery. The capacitor is now connected to an identical capacitor, charged to a potential 2V such that the positive polarity plates are connected together. At steady state, the common potential of the capacitors will be equal to[0.77 Mark]
Answer» A parallel plate capacitor of capacitance $C$ is charged to a potential $V$ and then disconnected from the battery. The capacitor is now connected to an identical capacitor, charged to a potential $2 V$ such that the positive polarity plates are connected together. At steady state, the common potential of the capacitors will be equal to $[$ 0.77 Mark $]$

Discussion

5397.	A child is standing at one end of a long trolley moving with a speed v on a smooth horizontal track. If the child starts running towards the other end of the trolley with a speed u, the centre of mass of the system (trolley + child) will move with a speed
Answer» A child is standing at one end of a long trolley moving with a speed v on a smooth horizontal track. If the child starts running towards the other end of the trolley with a speed u, the centre of mass of the system (trolley + child) will move with a speed

Discussion

5398.	The work done in increasing the potential of a capacitor from V volts to 2V volts is W. If the work done in increasing the potential of the same capacitor from 2V volts to 4V volts will be nW, then find the value of n
Answer» The work done in increasing the potential of a capacitor from $V$ volts to $2 V$ volts is $W$ . If the work done in increasing the potential of the same capacitor from $2 V$ volts to $4 V$ volts will be $n W$ , then find the value of $n$

Discussion

5399.	Which of the following is dependent on the intensity of incident radiation in a photoelectric experiment
Answer» Which of the following is dependent on the intensity of incident radiation in a photoelectric experiment

Discussion

5400.	Six small raindrops each of radius 1.5 mm, come down with a terminal velocity of 6 cm s–1. They coalesce to form a bigger drop. What is the terminal velocity (nearest integer in m s–1) of the bigger drop?
Answer» Six small raindrops each of radius 1.5 mm, come down with a terminal velocity of $6 c m s^{- 1} .$ They coalesce to form a bigger drop. What is the terminal velocity (nearest integer in $m s^{- 1})$ of the bigger drop?

Discussion

Explore topic-wise InterviewSolutions in .

The circuit below is made up using identical light bulbs. The light bulb of maximum brightness among the following will be

A projectile thrown with an initial velocity u has the same range R when the maximum height attained by it is either h1 or h2. Then R, h1 and h2 are related as

A proton accelerated by a potential difference V=500 kV moves through a transverse magnetic field B=0.51 T as shown in figure. Then the angle θ through which the proton deviates from the initial direction of its motion is (approximately)

One radian is equal to angle of

If weight is 20kgwt and height it is kept is 5meters then what will the potential energy in joules?

two busescA and B are at position 50m andv100m from the orgin at time t=0 they start moving in the same direction simul†an eously with uniform velocity of 10m/s2 and 5m/s2 determine the time and position at which A overtake

A current i = 2 + 3sin(2π103t) is flowing through a resistance of value 4Ω. Heat generated in kilo joules in 3 minutes across the resistance is (Write up to two digits after the decimal point)

What causes potential energy in a molecule inside a liquid?

The position x of a particle with respect to time t along x-axis is given by x=9t∧2-t∧3 where x is in metres and t in seconds. What will be the position of this particle when it achieves maximum speed along the + x direction? (1) 24m (2) 32m (3) 54m (4) 81

When a ceiling fan is switched off, its angular velocity falls to half, while it makes 36 rotations. How many more rotations will it make, before coming to rest?Assume uniform angular retardation throughout the motion.

A particle is executing SHM along a straight line. Its velocities at distances x1 and x2 from the mean position are v1 and v2 respectively. Its time period of oscillation is

Two spring systems have equal mass and spring constants k1 and k2. If the maximum velocities in two systems are equal, then the ratio of amplitude of first to that of second is,

A body of mass 3 kg is under a force which causes a displacement in it is given by S=tcube/3 (in m). Find the work done by the force in first 2 seconds

falling particle in the last second of its fallpasses through 58.86 m. Total time of fall is(1) 5.5 s(2) 6.5 s(3) 7.5 s(4) 8.5 s

37. Compute the electric flux in a cubical surface of side 10cm , when change of 5 uC is enclosed by them.

Work done by frictional force depends upon path taken since it is a non conservative force, but still we use displacement while finding out the work done( by friction) . Why is it so?

an unbanked curved has a radius of 60m The maximium speed at which a car makes a trun if the cofficient of static friction is 0.75 is

A charge particle (-q) is placed along the axis of uniformly charged fixed ring of radius R. Initially charge is released from its position (2R,0,0), predict its motion. 1) Periodic motion 2) SHM 3) Uniform motion 4) Charge particle does not return to its initial position.

The magnification of an object placed in front of a convex lens of focal length 20 cm is +2. The image distance is________.

a ray of light moving along a principal axis is falling on a concave mirror . in which direction it is reflected?

A SONAR system fixed in a submarine operates at a frequency 40.0 kHz. An enemy submarine moves towards the SONAR with a speed of 360 km h¯¹. What is the frequency of sound reflected by the submarine ? Take the speed of sound in water to be 1450 m s¯¹.

If the gravitational potential due to the earth at infinite distance from it is zero, the potential at a point P is −5 J kg−1. Suppose we arbitrarily assume the gravitational potential at infinity to be +10 J kg−1. Then, gravitational potential at P will be

88.Twelve capacitors each of capacitance 1 micro farad are connected as shown.the effective capacitance between corners a and b will be

Find the value of cos20.cos40.cos60.cos80 (all angles are in degree measure)

A parallel plate air condenser has a capacity of 4 μF. It is filled with two different dielectrics of constants 4 and 6 and they fill the upper and lower halves of the space as shown. The capacity now will be

One quadrant of a circular disc is removed from the original disc of radius 5 cm. Take reference axes and origin O as shown in the figure. Find the sum of the magnitudes (in cm) of the x and y coordinates of the COM of the new shape. Consider the material to be of uniform density.

A long solenoid has 200 turns/cm and carries a current i. The magnetic field at its center is 6.28×10−2 T. Another long solenoid has 100 turns/cm and its carries a current i3. The magnitude of the magnetic field at its center is -

Polarization is the

If an electron in hydrogen atom jumps from an orbit of level n = 3 to an orbit of level n = 2, the emitted radiation has a frequency (R = Rydberg constant., C = velocity of light)

A particle of mass m and carrying charge -q1 is moving around charge q2 along circular path radius r .find the period of revolution of the charge -q1??

A body cools from 60 ∘C to 50 ∘C in 10 minutes. If the room temperature is 25 ∘C then the temperature of the body at the end of the next 10 minutes will be

X- rays of wavelength 0.140 nm are scattered from a very thin slice of carbon. What will be the wavelength of X- rays scattered at 180∘.

A boy standing at the top of a tower of 20 m height drops a stone. Assuming g 10 ms-2, the velocity with which it hits the ground is

If y=sin2θ+cos3θ. Find dydθ.

If a charge q is placed at the centre of the line joining two equal charges Q such that the line system is in equilibrium then the value of q is?

A charge Q is distributed over two concentric hallow sphere of radii r and R (R>R) such that their surface charge densities are equal. Find the potential at the common centre

When tuning forks A and B are sounded together, 5 beats per second are heard. The frequency of A is 250 Hz. On loading fork A with wax, 2 beats per second are produced with fork B. The frequency of fork B is -

In the circuit shown R1=R2=10 Ω and resistance per unit length of wire PQ = 1 Ω/cm and length PQ = 10 cm. If R2 is made 20 Ω then to get zero deflection in galvanometer. S is midpoint of wire PQ:-

Tungsten has atomic radius 0.136nm . the density of tungsten is 19.4g/cmcube. what is the crystal struture of tungsten how a is caculated supossing that a is bcc

the resistance of moving coil galvanometer is 195ohm and its FSD current is 100mA .the resistance required to be connected to convert it into ammeter of range 4A is

A child is standing at one end of a long trolley moving with a speed v on a smooth horizontal track. If the child starts running towards the other end of the trolley with a speed u, the centre of mass of the system (trolley + child) will move with a speed

The work done in increasing the potential of a capacitor from V volts to 2V volts is W. If the work done in increasing the potential of the same capacitor from 2V volts to 4V volts will be nW, then find the value of n

Which of the following is dependent on the intensity of incident radiation in a photoelectric experiment

Six small raindrops each of radius 1.5 mm, come down with a terminal velocity of 6 cm s–1. They coalesce to form a bigger drop. What is the terminal velocity (nearest integer in m s–1) of the bigger drop?