50278 + Interview Questions in Physics Page 224 InterviewSolution

11151.	A current carrying circular loop is placed in x−y plane, with the centre at origin. Half of the loop is now bent so that it is in y−z plane. If initially, the magnitude of magnetic field at origin is B, then what is the magnitude of magnetic field at origin after bending?
Answer» A current carrying circular loop is placed in $x - y$ plane, with the centre at origin. Half of the loop is now bent so that it is in $y - z$ plane. If initially, the magnitude of magnetic field at origin is $B$ , then what is the magnitude of magnetic field at origin after bending?

Discussion

11152.	A light beam of wavelength λ falls on a stack of partially reflecting planes with separation d. The angle θ that the beam should make with the planes so that the beams reflected from successive planes may interfere constructively is (where n =1, 2, ……)
Answer» A light beam of wavelength $λ$ falls on a stack of partially reflecting planes with separation d. The angle $θ$ that the beam should make with the planes so that the beams reflected from successive planes may interfere constructively is (where n =1, 2, ……)

11152.

A light beam of wavelength λ falls on a stack of partially reflecting planes with separation d. The angle θ that the beam should make with the planes so that the beams reflected from successive planes may interfere constructively is (where n =1, 2, ……)

Answer»

A light beam of wavelength $λ$ falls on a stack of partially reflecting planes with separation d. The angle $θ$ that the beam should make with the planes so that the beams reflected from successive planes may interfere constructively is (where n =1, 2, ……)

Discussion

11153.	22. Exception= ccl4,cf4(organic origin). Explain
Answer» 22. Exception= ccl4,cf4(organic origin). Explain

Discussion

11154.	determine the maximum acceleration of the truck in which a box lying on the floor of its back will remain stationary given that the coefficient of static friction between the box and trucks floor is 0.2
Answer» determine the maximum acceleration of the truck in which a box lying on the floor of its back will remain stationary given that the coefficient of static friction between the box and trucks floor is 0.2

Discussion

11155.	The circuit given below consists of cells with their internal resistance,(i) The equivalent emf between the terminals A and B is
Answer» The circuit given below consists of cells with their internal resistance, $(i)$ The equivalent emf between the terminals $A$ and $B$ is

Discussion

11156.	A symmetrical 3-hinged parabolic arch of span ′l′ and rise 'h' carries a point load 'W' which may be placed anywhere on the span. The distance of the section where maximum bending moment occurs from crown will be
Answer» A symmetrical 3-hinged parabolic arch of span $^{'} l^{'}$ and rise 'h' carries a point load 'W' which may be placed anywhere on the span. The distance of the section where maximum bending moment occurs from crown will be

Discussion

11157.	A heavy particle is suspended by a string of length l. The particle is given a horizontal velocity v0. The string becomes slack at some angle and the particle proceeds on a parabola. Find the value of v0 if the particle passes through the point of suspension.
Answer» A heavy particle is suspended by a string of length l. The particle is given a horizontal velocity $v_{0}$ . The string becomes slack at some angle and the particle proceeds on a parabola. Find the value of $v_{0}$ if the particle passes through the point of suspension.

11157.

A heavy particle is suspended by a string of length l. The particle is given a horizontal velocity v0. The string becomes slack at some angle and the particle proceeds on a parabola. Find the value of v0 if the particle passes through the point of suspension.

Answer»

A heavy particle is suspended by a string of length l. The particle is given a horizontal velocity $v_{0}$ . The string becomes slack at some angle and the particle proceeds on a parabola. Find the value of $v_{0}$ if the particle passes through the point of suspension.

Discussion

11158.	If a particle is fired vertically upward from the surface of earth and reaches a heightof 6400km the initial velocity of particle: 1) 4km/s 2)2km/s 3)8km/s 4)16km/s
Answer» If a particle is fired vertically upward from the surface of earth and reaches a heightof 6400km the initial velocity of particle: 1) 4km/s 2)2km/s 3)8km/s 4)16km/s

Discussion

11159.	A stone is dropped from a height of 100 m from the ground. Take accelaration due to gravity as 9.8 m/s2. Calculate: (a) The velocity with which it reaches the ground. (b) The time taken to reach the ground. [3 MARKS]
Answer» A stone is dropped from a height of 100 m from the ground. Take accelaration due to gravity as $9.8 m / s^{2}$ . Calculate: (a) The velocity with which it reaches the ground. (b) The time taken to reach the ground. [3 MARKS]

Discussion

11160.	In H2-O2 fuel cell,11.2L H2 at NTP reacts in 5000sec,the current (average) produced by the fuel cell is1.1.94A2.19.3A3.9.65A
Answer» In H2-O2 fuel cell,11.2L H2 at NTP reacts in 5000sec,the current (average) produced by the fuel cell is 1.1.94A 2.19.3A 3.9.65A

Discussion

11161.	Ahole is drilled in a copper sheet. The diameter of the hole is 4.24cm at 27.0 °C. What is the change in the diameter of the holewhen the sheet is heated to 227 °C? Coefficient of linearexpansion of copper = 1.70 × 10–5K–1.
Answer» A hole is drilled in a copper sheet. The diameter of the hole is 4.24 cm at 27.0 °C. What is the change in the diameter of the hole when the sheet is heated to 227 °C? Coefficient of linear expansion of copper = 1.70 × 10^–5 K^–1.

Discussion

11162.	A uniform thin disk of mass 1 kg and radius 0.1 m is kept on a surface as shown in the figure. A spring of stiffness K1=400N/m is connected to the disk center A and another spring of stiffness k2=100 N/m is connected at point B just above point A on the circumference of the disk. Initially, both the springs are unstretched. Assume pure rolling of the disk. For small disturbance from the equilibrium, the natural frequency of vibration of the system is rad/s (round off to one decimal place)
Answer» A uniform thin disk of mass 1 kg and radius 0.1 m is kept on a surface as shown in the figure. A spring of stiffness $K_{1} = 400$ N/m is connected to the disk center A and another spring of stiffness $k_{2} = 100$ N/m is connected at point B just above point A on the circumference of the disk. Initially, both the springs are unstretched. Assume pure rolling of the disk. For small disturbance from the equilibrium, the natural frequency of vibration of the system is rad/s (round off to one decimal place)

Discussion

11163.	A thin spherical shell of mass M and radius R as shown in the figure slips on a rough horizontal plane. At the same instant, it has translational velocity v0 and rotational velocity about the centre 3v0R . Find the translation velocity after the shell starts pure rolling.
Answer» A thin spherical shell of mass $M$ and radius $R$ as shown in the figure slips on a rough horizontal plane. At the same instant, it has translational velocity $v_{0}$ and rotational velocity about the centre $\frac{3 v_{0}}{R}$ . Find the translation velocity after the shell starts pure rolling.

Discussion

11164.	A student is performing the experiment of Resonance Column. The diameter of the column tube is 4 cm. The frequency of the tuning fork is 512 Hz. The ari temperature is 38oC in which the seed of sound is 336 m/s. The zero of the meter scale coincides with the top end of the Resonance Column tube. When the first resonance occurs, the reading of the water level in the column is
Answer» A student is performing the experiment of Resonance Column. The diameter of the column tube is $4 c m$ . The frequency of the tuning fork is $512 H z$ . The ari temperature is $38^{o} C$ in which the seed of sound is $336 m / s$ . The zero of the meter scale coincides with the top end of the Resonance Column tube. When the first resonance occurs, the reading of the water level in the column is

Discussion

11165.	In a YDSE experiment, d=1 mm, λ=6000 A∘ and D=1 m. The minimum distance between two points on screen having 75% intensity of the maximum intensity will be
Answer» In a $Y D S E$ experiment, $d = 1 mm$ , $λ = 6000 A^{\circ}$ and $D = 1 m$ . The minimum distance between two points on screen having $75 %$ intensity of the maximum intensity will be

Discussion

11166.	In the figure shown a current I1 is established in the long straight wire AB. Another wire CD carrying current I2 is placed in the plane of the paper. The line joining the ends of this wire is perpendicular to the wire AB. The resultant force on the wire CD is:
Answer» In the figure shown a current I₁ is established in the long straight wire AB. Another wire CD carrying current I₂ is placed in the plane of the paper. The line joining the ends of this wire is perpendicular to the wire AB. The resultant force on the wire CD is:

11166.

In the figure shown a current I1 is established in the long straight wire AB. Another wire CD carrying current I2 is placed in the plane of the paper. The line joining the ends of this wire is perpendicular to the wire AB. The resultant force on the wire CD is:

Answer»

In the figure shown a current I₁ is established in the long straight wire AB. Another wire CD carrying current I₂ is placed in the plane of the paper. The line joining the ends of this wire is perpendicular to the wire AB. The resultant force on the wire CD is:

Discussion

11167.	A positive charge particle with charge q and mass m is moving with velocity v=v0^i in a uniform magnetic field →B=−B0^k. The time spent by the particle in the magnetic field if d is equal to mv2qB will be.
Answer» A positive charge particle with charge $q$ and mass $m$ is moving with velocity $v = v_{0}^i$ in a uniform magnetic field $\to B = - B_{0}^k$ . The time spent by the particle in the magnetic field if $d$ is equal to $\frac{m v}{2 q B}$ will be.

Discussion

11168.	In an ammeter 0.2% of the main current passes through the galvanometer. If resis†an ce of galvanometer is G, the resis†an ce of ammeter will be?
Answer» In an ammeter 0.2% of the main current passes through the galvanometer. If resis†an ce of galvanometer is G, the resis†an ce of ammeter will be?

Discussion

11169.	In the circuit shown in the figure, the value of Rc is
Answer» In the circuit shown in the figure, the value of $R_{c}$ is

Discussion

11170.	how and why magnetic susceptibility of diamagnetic substance is negative?
Answer» how and why magnetic susceptibility of diamagnetic substance is negative?

Discussion

11171.	If γ be the ratio of molar heat capacities of an ideal gas, then degree of freedom for the molecules of gas is :
Answer» If $γ$ be the ratio of molar heat capacities of an ideal gas, then degree of freedom for the molecules of gas is :

Discussion

11172.	Water of density flows steadily through a horizontal pipe of variable cross section . If the pessure and velocity at a point are p and v then at other point where flow speed is 2v, find the pressure .
Answer» Water of density flows steadily through a horizontal pipe of variable cross section . If the pessure and velocity at a point are p and v then at other point where flow speed is 2v, find the pressure .

Discussion

11173.	3. In the electrochemical cell: Zn\|ZnSO4(0.01M)\|\|CuSO4\|Cu, the emf of this Daniel cell is E1. When the concentration of ZnSO4 is changed to 1.0M and that of CuSO4 changed to 0.01M, the emf changes to E2. From the following, which one is relationship between E1 and E2? (Given RT/F= 0.059 (1) E1=E2 (2) E1E2 (4) E2=0≠ E1
Answer» 3. In the electrochemical cell: Zn\|ZnSO4(0.01M)\|\|CuSO4\|Cu, the emf of this Daniel cell is E1. When the concentration of ZnSO4 is changed to 1.0M and that of CuSO4 changed to 0.01M, the emf changes to E2. From the following, which one is relationship between E1 and E2? (Given RT/F= 0.059 (1) E1=E2 (2) E1E2 (4) E2=0≠ E1

Discussion

11174.	The displacement of a particle along the x-axis isgiven by x= a sin^2t. The motion of the particecorresponds to\lbrack AIPMT (Prelims)-2010\rbrack
Answer» The displacement of a particle along the x-axis isgiven by x= a sin^2t. The motion of the particecorresponds to\lbrack AIPMT (Prelims)-2010\rbrack

Discussion

11175.	A vibration magnetometer consists of two identical barmagnets placed one over the other such that they aremutually perpendicular and bisect each other. The timeperiod of combination is 4 s. If one of the magnets isremoved, find the period of other
Answer» A vibration magnetometer consists of two identical barmagnets placed one over the other such that they aremutually perpendicular and bisect each other. The timeperiod of combination is 4 s. If one of the magnets isremoved, find the period of other

Discussion

11176.	How do balanced force can give rise to change in the shape of an object?
Answer» How do balanced force can give rise to change in the shape of an object?

Discussion

11177.	In older times the people used to think that the earth was flat Imagione that the earth is indeed not a sphere of radius R but an infinite plane of thickness H.what value of H is needed to allow the same gravitational acceleration to be exprienced as on the actual surface of the eart
Answer» In older times the people used to think that the earth was flat Imagione that the earth is indeed not a sphere of radius R but an infinite plane of thickness H.what value of H is needed to allow the same gravitational acceleration to be exprienced as on the actual surface of the eart

Discussion

11178.	Calculate the (a) momentum, and (b) de Broglie wavelength of the electrons accelerated through a potential difference of 56 V
Answer» Calculate the (a) momentum, and (b) de Broglie wavelength of the electrons accelerated through a potential difference of 56 V

Discussion

11179.	14.) A ball falls on an inclined plane of inclination theta from aheight h above the point of impact and makes a perfectly elastic collision. Where will it hit the plane again?
Answer» 14.) A ball falls on an inclined plane of inclination theta from aheight h above the point of impact and makes a perfectly elastic collision. Where will it hit the plane again?

Discussion

11180.	Photons with energy 5eV are incident on cathode c in a photoelectric cell the maximum energy of emitted photoelectrons is 2eV when photons of energy 6eVare incident on c,no photoeletrons will reach the anode A if the stopping potential of A relative to C is
Answer» Photons with energy 5eV are incident on cathode c in a photoelectric cell the maximum energy of emitted photoelectrons is 2eV when photons of energy 6eVare incident on c,no photoeletrons will reach the anode A if the stopping potential of A relative to C is

Discussion

11181.	When a car moves on a road, then the bottommost point is always at rest relative to the ground at that particular instant and since friction only opposes relative motion between two bodies then according to this there should be no friction acting on the bottommost point of the wheel. If this is the case then according to Newton's 1st law, the car should continue to move forever unless brakes are applied. But in reality this doesn't happen & as the accelerator is released the car moves for sometime & ultimately stops even though no brakes are applied. How is this possible?
Answer» When a car moves on a road, then the bottommost point is always at rest relative to the ground at that particular instant and since friction only opposes relative motion between two bodies then according to this there should be no friction acting on the bottommost point of the wheel. If this is the case then according to Newton's 1st law, the car should continue to move forever unless brakes are applied. But in reality this doesn't happen & as the accelerator is released the car moves for sometime & ultimately stops even though no brakes are applied. How is this possible?

Discussion

11182.	the minimum and maximum wavelength absorbed by a sample of H atoms is
Answer» the minimum and maximum wavelength absorbed by a sample of H atoms is

Discussion

11183.	Given that, ∫2TTx(t).dt=2 x(t),y(t)=ddxx(t) signals are periodic signals of time period T = 8, with Fourier series coefficient ak and bk respectively.Which one of the following expressions are correct ?
Answer» Given that, $\int_{T}^{2 T} x (t) . d t = 2$ $x (t), y (t) = \frac{d}{d x} x (t)$ signals are periodic signals of time period T = 8, with Fourier series coefficient $a_{k} a n d b_{k}$ respectively. Which one of the following expressions are correct ?

Discussion

11184.	Pressure versus temperature graph of an ideal gas is shown in figure Corresponding density (ρ) versus volume (V) graph will be:
Answer» Pressure versus temperature graph of an ideal gas is shown in figure Corresponding density $(ρ)$ versus volume (V) graph will be:

11184.

Pressure versus temperature graph of an ideal gas is shown in figure Corresponding density (ρ) versus volume (V) graph will be:

Answer»

Pressure versus temperature graph of an ideal gas is shown in figure

Corresponding density $(ρ)$ versus volume (V) graph will be:

Discussion

11185.	A cylindrical tube of length l has inner radius a while outer radius b. The resistance of the tube between its inner and outer surfaces will be(resistivity of material is ρ)
Answer» A cylindrical tube of length $l$ has inner radius $a$ while outer radius $b$ . The resistance of the tube between its inner and outer surfaces will be $($ resistivity of material is $ρ)$

Discussion

11186.	For the de Broglie wavelength of 10−17 m , momentum of a particle will be
Answer» For the de Broglie wavelength of $10^{- 17}$ m , momentum of a particle will be

Discussion

11187.	A light bulb of resistance r = 16Ω is attached in series with an infinite resistor network with identical resistances r as shown below. A 10 V battery derives current in the circuit. What should be the value of r such that the bulb dissipated about 1 W of power?
Answer» A light bulb of resistance r = 16 $Ω$ is attached in series with an infinite resistor network with identical resistances r as shown below. A 10 V battery derives current in the circuit. What should be the value of r such that the bulb dissipated about 1 W of power?

11187.

A light bulb of resistance r = 16Ω is attached in series with an infinite resistor network with identical resistances r as shown below. A 10 V battery derives current in the circuit. What should be the value of r such that the bulb dissipated about 1 W of power?

Answer»

A light bulb of resistance r = 16 $Ω$ is attached in series with an infinite resistor network with identical resistances r as shown below. A 10 V battery derives current in the circuit. What should be the value of r such that the bulb dissipated about 1 W of power?

Discussion

11188.	The torque transmitted by a cylindrical shaft is to be measured by using two strain gauges. The angles for mounting the strain gauges relative to the axis of the shaft for maximum sensitivity are
Answer» The torque transmitted by a cylindrical shaft is to be measured by using two strain gauges. The angles for mounting the strain gauges relative to the axis of the shaft for maximum sensitivity are

Discussion

11189.	Light of wavelength 488 nm is produced by an Argonlaser, which is used in the photoelectric effect. When light from this spectralline is incident on the emitter, the stopping (cut-off) potential ofphotoelectrons is 0.38 V. Find the work function of the material from which theemitter is made.
Answer» Light of wavelength 488 nm is produced by an Argon laser, which is used in the photoelectric effect. When light from this spectral line is incident on the emitter, the stopping (cut-off) potential of photoelectrons is 0.38 V. Find the work function of the material from which the emitter is made.

Discussion

11190.	In the AC network shown in the figure, the rms current flowing through the inductor and capacitor are 0.6 A and 0.8 A, respectively. Then, the current coming out of the source is -
Answer» In the AC network shown in the figure, the rms current flowing through the inductor and capacitor are $0.6 A$ and $0.8 A$ , respectively. Then, the current coming out of the source is -

Discussion

11191.	If a metallic sphere gets cooled from 62o C to 50o C in 10 minutes in and in the next 10 minutes gets cooled to 42o C, then the temperature of the surroundings is
Answer» If a metallic sphere gets cooled from $62^{o} C t o 50^{o} C i n 10 m i n u t e s$ in and in the next 10 minutes gets cooled to $42^{o} C$ , then the temperature of the surroundings is

Discussion

11192.	In a region, electric potential varies with position x as V=4x2. The magnitude of electric field at x=2 m is
Answer» In a region, electric potential varies with position $x$ as $V = 4 x^{2}$ . The magnitude of electric field at $x = 2 m$ is

Discussion

11193.	A block of mass m kept on a rough horizontal surface is connected to a dielectric slab of mass m/6 and dielectric constant K by means of a light and inextensible string passing over a fixed pulley as shown in figure. The dielectric can completely fill the space between the parallel plate capacitor of plate width l. The separation between the plates is d kept in vertical position. Initially switch S is open and length of dielectric inside the capacitor is b. The coefficient of friction between the block and surface is 1/4. The minimum value of emf of battery V, such that after closing the switch block start to move:(Neglect any other forces)
Answer» A block of mass $m$ kept on a rough horizontal surface is connected to a dielectric slab of mass $m / 6$ and dielectric constant $K$ by means of a light and inextensible string passing over a fixed pulley as shown in figure. The dielectric can completely fill the space between the parallel plate capacitor of plate width $l$ . The separation between the plates is $d$ kept in vertical position. Initially switch $S$ is open and length of dielectric inside the capacitor is $b$ . The coefficient of friction between the block and surface is $1 / 4$ . The minimum value of emf of battery $V$ , such that after closing the switch block start to move: (Neglect any other forces)

Discussion

11194.	An AC circuit consists of an inductor of inductance 0.5 H and a capacitor of capacitance 8 μF in series. The current in the circuit is maximum when the angular frequency of AC source is,
Answer» An $AC$ circuit consists of an inductor of inductance $0.5 H$ and a capacitor of capacitance $8 μ F$ in series. The current in the circuit is maximum when the angular frequency of $AC$ source is,

Discussion

11195.	Two identical ball bearings in contact with each other and resting on a frictionless table are hit head-on by another ball bearing of the same mass moving initially with aspeed V. If the collision is elastic, which of the following (Fig. 6.14) is a possible result after collision ?
Answer» Two identical ball bearings in contact with each other and resting on a frictionless table are hit head-on by another ball bearing of the same mass moving initially with aspeed V. If the collision is elastic, which of the following (Fig. 6.14) is a possible result after collision ?

Discussion

11196.	Sides of a quadrilateral circumscribed by a circle have resistance per unit length of 1 Ω/m. Side AB is 4 m, side AD is 3 m and AC is 5 m. AC is diameter of circle. The resistance of circle is zero but its diameter has a resistance per unit length of 1 Ω/m. Equivalent resistance between point B and D is (Write upto two digits after the decimal point.)
Answer» Sides of a quadrilateral circumscribed by a circle have resistance per unit length of $1 Ω / m .$ Side AB is $4 m$ , side AD is $3 m$ and AC is $5 m$ . AC is diameter of circle. The resistance of circle is zero but its diameter has a resistance per unit length of $1 Ω / m .$ Equivalent resistance between point B and D is (Write upto two digits after the decimal point.)

Discussion

11197.	Question 4An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass is 3.5 kg. Both spheres are dropped simultaneously from a tower. When they are 10 m above the ground, they have the same(a) acceleration(b) momenta(c) potential energy(d) kinetic energy
Answer» Question 4 An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass is 3.5 kg. Both spheres are dropped simultaneously from a tower. When they are 10 m above the ground, they have the same (a) acceleration (b) momenta (c) potential energy (d) kinetic energy

Discussion

11198.	Starting from rest, a body slides down a 45∘ rough inclined plane in twice the time it takes to slide down the same distance in the absence of friction (with same inclination). The coefficient of friction between the body and the inclined plane is
Answer» Starting from rest, a body slides down a $45^{\circ}$ rough inclined plane in twice the time it takes to slide down the same distance in the absence of friction (with same inclination). The coefficient of friction between the body and the inclined plane is

Discussion

11199.	Calculate the energy of one mole of photons of radiation whose frequency is 5 * 10 ^ 14 Hz
Answer» Calculate the energy of one mole of photons of radiation whose frequency is 5 * 10 ^ 14 Hz

Discussion

11200.	A shell is fired from a fixed artillery gun with an initial speed u such that it hits the target on the ground at a distance R from it. If t1 and t2 are the values of the time taken by it to hit the target in two possible ways, the product t1t2 is:
Answer» A shell is fired from a fixed artillery gun with an initial speed $u$ such that it hits the target on the ground at a distance $R$ from it. If $t_{1}$ and $t_{2}$ are the values of the time taken by it to hit the target in two possible ways, the product $t_{1} t_{2}$ is:

Discussion

Explore topic-wise InterviewSolutions in .

A current carrying circular loop is placed in x−y plane, with the centre at origin. Half of the loop is now bent so that it is in y−z plane. If initially, the magnitude of magnetic field at origin is B, then what is the magnitude of magnetic field at origin after bending?

A light beam of wavelength λ falls on a stack of partially reflecting planes with separation d. The angle θ that the beam should make with the planes so that the beams reflected from successive planes may interfere constructively is (where n =1, 2, ……)

22. Exception= ccl4,cf4(organic origin). Explain

determine the maximum acceleration of the truck in which a box lying on the floor of its back will remain stationary given that the coefficient of static friction between the box and trucks floor is 0.2

The circuit given below consists of cells with their internal resistance,(i) The equivalent emf between the terminals A and B is

A symmetrical 3-hinged parabolic arch of span ′l′ and rise 'h' carries a point load 'W' which may be placed anywhere on the span. The distance of the section where maximum bending moment occurs from crown will be

A heavy particle is suspended by a string of length l. The particle is given a horizontal velocity v0. The string becomes slack at some angle and the particle proceeds on a parabola. Find the value of v0 if the particle passes through the point of suspension.

If a particle is fired vertically upward from the surface of earth and reaches a heightof 6400km the initial velocity of particle: 1) 4km/s 2)2km/s 3)8km/s 4)16km/s

A stone is dropped from a height of 100 m from the ground. Take accelaration due to gravity as 9.8 m/s2. Calculate: (a) The velocity with which it reaches the ground. (b) The time taken to reach the ground. [3 MARKS]

In H2-O2 fuel cell,11.2L H2 at NTP reacts in 5000sec,the current (average) produced by the fuel cell is1.1.94A2.19.3A3.9.65A

Ahole is drilled in a copper sheet. The diameter of the hole is 4.24cm at 27.0 °C. What is the change in the diameter of the holewhen the sheet is heated to 227 °C? Coefficient of linearexpansion of copper = 1.70 × 10–5K–1.

A thin spherical shell of mass M and radius R as shown in the figure slips on a rough horizontal plane. At the same instant, it has translational velocity v0 and rotational velocity about the centre 3v0R . Find the translation velocity after the shell starts pure rolling.

In a YDSE experiment, d=1 mm, λ=6000 A∘ and D=1 m. The minimum distance between two points on screen having 75% intensity of the maximum intensity will be

In the figure shown a current I1 is established in the long straight wire AB. Another wire CD carrying current I2 is placed in the plane of the paper. The line joining the ends of this wire is perpendicular to the wire AB. The resultant force on the wire CD is:

A positive charge particle with charge q and mass m is moving with velocity v=v0^i in a uniform magnetic field →B=−B0^k. The time spent by the particle in the magnetic field if d is equal to mv2qB will be.

In an ammeter 0.2% of the main current passes through the galvanometer. If resis†an ce of galvanometer is G, the resis†an ce of ammeter will be?

In the circuit shown in the figure, the value of Rc is

how and why magnetic susceptibility of diamagnetic substance is negative?

If γ be the ratio of molar heat capacities of an ideal gas, then degree of freedom for the molecules of gas is :

Water of density flows steadily through a horizontal pipe of variable cross section . If the pessure and velocity at a point are p and v then at other point where flow speed is 2v, find the pressure .

The displacement of a particle along the x-axis isgiven by x= a sin^2t. The motion of the particecorresponds to\lbrack AIPMT (Prelims)-2010\rbrack

A vibration magnetometer consists of two identical barmagnets placed one over the other such that they aremutually perpendicular and bisect each other. The timeperiod of combination is 4 s. If one of the magnets isremoved, find the period of other

How do balanced force can give rise to change in the shape of an object?

In older times the people used to think that the earth was flat Imagione that the earth is indeed not a sphere of radius R but an infinite plane of thickness H.what value of H is needed to allow the same gravitational acceleration to be exprienced as on the actual surface of the eart

Calculate the (a) momentum, and (b) de Broglie wavelength of the electrons accelerated through a potential difference of 56 V

14.) A ball falls on an inclined plane of inclination theta from aheight h above the point of impact and makes a perfectly elastic collision. Where will it hit the plane again?

Photons with energy 5eV are incident on cathode c in a photoelectric cell the maximum energy of emitted photoelectrons is 2eV when photons of energy 6eVare incident on c,no photoeletrons will reach the anode A if the stopping potential of A relative to C is

the minimum and maximum wavelength absorbed by a sample of H atoms is

Given that, ∫2TTx(t).dt=2 x(t),y(t)=ddxx(t) signals are periodic signals of time period T = 8, with Fourier series coefficient ak and bk respectively.Which one of the following expressions are correct ?

Pressure versus temperature graph of an ideal gas is shown in figure Corresponding density (ρ) versus volume (V) graph will be:

A cylindrical tube of length l has inner radius a while outer radius b. The resistance of the tube between its inner and outer surfaces will be(resistivity of material is ρ)

For the de Broglie wavelength of 10−17 m , momentum of a particle will be

A light bulb of resistance r = 16Ω is attached in series with an infinite resistor network with identical resistances r as shown below. A 10 V battery derives current in the circuit. What should be the value of r such that the bulb dissipated about 1 W of power?

The torque transmitted by a cylindrical shaft is to be measured by using two strain gauges. The angles for mounting the strain gauges relative to the axis of the shaft for maximum sensitivity are

Light of wavelength 488 nm is produced by an Argonlaser, which is used in the photoelectric effect. When light from this spectralline is incident on the emitter, the stopping (cut-off) potential ofphotoelectrons is 0.38 V. Find the work function of the material from which theemitter is made.

In the AC network shown in the figure, the rms current flowing through the inductor and capacitor are 0.6 A and 0.8 A, respectively. Then, the current coming out of the source is -

If a metallic sphere gets cooled from 62o C to 50o C in 10 minutes in and in the next 10 minutes gets cooled to 42o C, then the temperature of the surroundings is

In a region, electric potential varies with position x as V=4x2. The magnitude of electric field at x=2 m is

An AC circuit consists of an inductor of inductance 0.5 H and a capacitor of capacitance 8 μF in series. The current in the circuit is maximum when the angular frequency of AC source is,

Two identical ball bearings in contact with each other and resting on a frictionless table are hit head-on by another ball bearing of the same mass moving initially with aspeed V. If the collision is elastic, which of the following (Fig. 6.14) is a possible result after collision ?

Question 4An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass is 3.5 kg. Both spheres are dropped simultaneously from a tower. When they are 10 m above the ground, they have the same(a) acceleration(b) momenta(c) potential energy(d) kinetic energy

Starting from rest, a body slides down a 45∘ rough inclined plane in twice the time it takes to slide down the same distance in the absence of friction (with same inclination). The coefficient of friction between the body and the inclined plane is

Calculate the energy of one mole of photons of radiation whose frequency is 5 * 10 ^ 14 Hz

A shell is fired from a fixed artillery gun with an initial speed u such that it hits the target on the ground at a distance R from it. If t1 and t2 are the values of the time taken by it to hit the target in two possible ways, the product t1t2 is: