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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 6601. |
In the graph of variation of AC (I) in series RLC circuit with frequency ω of external AC emf, there is max. current I at frequency ω and current I/\surd2 at frequencies ω1 and ω2. The correct relation between resonane frequency ω and ω1,ω2 is-? |
| Answer» In the graph of variation of AC (I) in series RLC circuit with frequency ω of external AC emf, there is max. current I at frequency ω and current I/\surd2 at frequencies ω1 and ω2. The correct relation between resonane frequency ω and ω1,ω2 is-? | |
| 6602. |
If a circuit made up of a resistance 1Ω and inductance 0.01H, and alternating emf 200V at 50Hz is connected, then the phase difference between the current and the emf in the circuit is: |
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Answer» If a circuit made up of a resistance 1Ω and inductance 0.01H, and alternating emf 200V at 50Hz is connected, then the phase difference between the current and the emf in the circuit is: |
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| 6603. |
One end of a light spring of natural length d and spring constant k is fixed on a rigid wall and the other is attached to a smooth ring of mass m which can slide without friction on a vertical rod fixed at a distance d from the wall. Initially the spring makes an angle of 37∘with the horizontal as shown in figure. When the system is released from rest, find the speed of the ring when the spring becomes horizontal. |
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Answer» One end of a light spring of natural length d and spring constant k is fixed on a rigid wall and the other is attached to a smooth ring of mass m which can slide without friction on a vertical rod fixed at a distance d from the wall. Initially the spring makes an angle of 37∘with the horizontal as shown in figure. When the system is released from rest, find the speed of the ring when the spring becomes horizontal. |
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| 6604. |
A uniform rod of mass m and length l is suspended about its end time period of small angular oscillations is |
| Answer» A uniform rod of mass m and length l is suspended about its end time period of small angular oscillations is | |
| 6605. |
A conductor ABOCD moves along its bisector with a velocity 1 m/s through a perpendicular magnetic field of 1 Wb/m2, as shown in figure. If all the four sides are 1 m length each, then the induced emf between A and D (in Volt) is approximately (upto two decimals) |
Answer» A conductor ABOCD moves along its bisector with a velocity 1 m/s through a perpendicular magnetic field of 1 Wb/m2, as shown in figure. If all the four sides are 1 m length each, then the induced emf between A and D (in Volt) is approximately  |
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| 6606. |
50 A rectangular surface of sides 10 cm and 15 cm is placed inside a uniform electric field of 25 V/m, suchthat the surface makes an angle of 30^° with the direction of electric field. Find the flux of the electric fieldthrough the rectangular surface(1) 0.1675 N/m2C(4) 0.1075 Nm2/C(2) 0.1875 Nm2/C(3) Zero |
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Answer» 50 A rectangular surface of sides 10 cm and 15 cm is placed inside a uniform electric field of 25 V/m, such that the surface makes an angle of 30^° with the direction of electric field. Find the flux of the electric field through the rectangular surface (1) 0.1675 N/m2C (4) 0.1075 Nm2/C (2) 0.1875 Nm2/C (3) Zero |
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| 6607. |
When an ideal diatomic gas is heated at constant pressure, the fraction of the heat energy supplied which increases the internal energy of the gas is |
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Answer» When an ideal diatomic gas is heated at constant pressure, the fraction of the heat energy supplied which increases the internal energy of the gas is |
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| 6608. |
The change in the magnetic dipole moment associated with the orbit, at the end of the time interval of the magnetic field change, is |
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Answer» The change in the magnetic dipole moment associated with the orbit, at the end of the time interval of the magnetic field change, is |
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| 6609. |
Prove that the area enclosed by the curve with equation x2+y2=r2, while taking the horizontal strips parallel to x-axis is πr2 sq. units. |
| Answer» Prove that the area enclosed by the curve with equation x2+y2=r2, while taking the horizontal strips parallel to x-axis is πr2 sq. units. | |
| 6610. |
A metallic solid sphere is placed in a uniform electric field. The electric lines of force follow the path(s) shown in the figure as |
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Answer» A metallic solid sphere is placed in a uniform electric field. The electric lines of force follow the path(s) shown in the figure as |
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| 6611. |
A positive magnification greater than unity indicates |
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Answer» A positive magnification greater than unity indicates |
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| 6612. |
A super ball is to bounce elastically back and forth between two rigid walls at a dis†an ce d from each other.Neglecting gravity and assuming the velocity of super ball to be V horizontally, the average force being exerted by the super ball on one wall is how much |
| Answer» A super ball is to bounce elastically back and forth between two rigid walls at a dis†an ce d from each other.Neglecting gravity and assuming the velocity of super ball to be V horizontally, the average force being exerted by the super ball on one wall is how much | |
| 6613. |
A wooden block of mass M rests on a horizontal surface. A bullet of mass m moving in the horizontal direction strikes and gets embedded in it. The combined system covers a distance x on the surface. If the coefficient of friction between wood and the surface is μ, the speed of the bullet at the time of striking the block is (where m is mass of the bullet) |
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Answer» A wooden block of mass M rests on a horizontal surface. A bullet of mass m moving in the horizontal direction strikes and gets embedded in it. The combined system covers a distance x on the surface. If the coefficient of friction between wood and the surface is μ, the speed of the bullet at the time of striking the block is (where m is mass of the bullet) |
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| 6614. |
Two blocks A and B of mass M and 2M respectively, are hanging from a ceiling by means of a massless spring and a light string as shown. If the string between the blocks is suddenly cut and the downward acceleration is taken positive, then what will be the acceleration of the block A and B? |
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Answer» Two blocks A and B of mass M and 2M respectively, are hanging from a ceiling by means of a massless spring and a light string as shown. If the string between the blocks is suddenly cut and the downward acceleration is taken positive, then what will be the acceleration of the block A and B? |
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| 6615. |
The disk of radius 5 cm is cut from the uniform disc of radius 10 cm in such a way that the edge of the hole touches the edge of the disc. What is the distance of the center of mass of the remaining portion w.r.t the point O ? |
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Answer» The disk of radius 5 cm is cut from the uniform disc of radius 10 cm in such a way that the edge of the hole touches the edge of the disc. What is the distance of the center of mass of the remaining portion w.r.t the point O ? |
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| 6616. |
A body of mass 1 kg is suspended from massless spring of natural length 1 m. If mass is released from rest, spring stretches upto a vertical dis†an ce of 40 cm, the potentual energy stored in the spring at this extension i |
| Answer» A body of mass 1 kg is suspended from massless spring of natural length 1 m. If mass is released from rest, spring stretches upto a vertical dis†an ce of 40 cm, the potentual energy stored in the spring at this extension i | |
| 6617. |
The pressure applied from all directions on a cube is P. How much its temperature should be raised to maintain the original volume ? The volume elasticity of the cube is β and the coefficient of volume expansion is α |
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Answer» The pressure applied from all directions on a cube is P. How much its temperature should be raised to maintain the original volume ? The volume elasticity of the cube is β and the coefficient of volume expansion is α |
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| 6618. |
A ball of mass 5kg moving with speed 8m/s collides head on with another stationary ball of mass 15kg if collision is perfectly in elastic then loss in kinetic energy is 1) 160J 2 )80J 3) 40J 4 )120J |
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Answer» A ball of mass 5kg moving with speed 8m/s collides head on with another stationary ball of mass 15kg if collision is perfectly in elastic then loss in kinetic energy is 1) 160J 2 )80J 3) 40J 4 )120J |
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| 6619. |
In a region of magnetic field B, a loop of area A is placed. Angle between magnetic field and loop area vector is theta. If B, A and theta can be changed(if required), in how many ways magnetic flux through the loop can be change |
| Answer» In a region of magnetic field B, a loop of area A is placed. Angle between magnetic field and loop area vector is theta. If B, A and theta can be changed(if required), in how many ways magnetic flux through the loop can be change | |
| 6620. |
ntA taxi leaves the station X for station Y every 10 minutes. Simultaneously a taxi leaves the station X every 10 minutes. The taxis move at the same constant speed and go from X to Y or vice versa in 2 hours. How many taxis coming from the other side will each taxi meet enroute from Y to X?n nt1)10 2)11 3)12 4)23n |
| Answer» ntA taxi leaves the station X for station Y every 10 minutes. Simultaneously a taxi leaves the station X every 10 minutes. The taxis move at the same constant speed and go from X to Y or vice versa in 2 hours. How many taxis coming from the other side will each taxi meet enroute from Y to X?n nt1)10 2)11 3)12 4)23n | |
| 6621. |
7. A water drop of radius 1 cm is broken into 100Oequal droplets. What would be the gain in surfaceenergy if the surface tension of water is0.075 Nm ?(a) 16.96 x 10 J(c) 4.24 x 10 J\lbrack UK PMT 2015\rbrack(b) 8.48 x 10 J(d) 2.12x 10 |
| Answer» 7. A water drop of radius 1 cm is broken into 100Oequal droplets. What would be the gain in surfaceenergy if the surface tension of water is0.075 Nm ?(a) 16.96 x 10 J(c) 4.24 x 10 J\lbrack UK PMT 2015\rbrack(b) 8.48 x 10 J(d) 2.12x 10 | |
| 6622. |
Light incident normally on a plane mirror attached to a galvanometercoil retraces backwards as shown in Fig. 9.36. A current in the coil produces a deflection of 3.5o of the mirror. What is the displacementof the reflected spot of light on a screen placed 1.5 m away? |
| Answer» Light incident normally on a plane mirror attached to a galvanometercoil retraces backwards as shown in Fig. 9.36. A current in the coil produces a deflection of 3.5o of the mirror. What is the displacementof the reflected spot of light on a screen placed 1.5 m away? | |
| 6623. |
What is a simple pendulum ? Show that motion executed by the bob of a pendulum is SHM. Derive an expression for it's time period. |
| Answer» What is a simple pendulum ? Show that motion executed by the bob of a pendulum is SHM. Derive an expression for it's time period. | |
| 6624. |
There is non conducting sphere of radius r which is uniformly charged. If small concentric sphere of radius R/2 is removed. The electric field inside the cavity is |
| Answer» There is non conducting sphere of radius r which is uniformly charged. If small concentric sphere of radius R/2 is removed. The electric field inside the cavity is | |
| 6625. |
4.A metal ring of radius R is uniformly charged in such a way that electric potential at its centre is Vo. Now it is placed horizontally above a grounded solid metal sphere of radius R, so that the centre of the ring and the top of the sphere coincide as shown. The total charged induced on the sphere |
| Answer» 4.A metal ring of radius R is uniformly charged in such a way that electric potential at its centre is Vo. Now it is placed horizontally above a grounded solid metal sphere of radius R, so that the centre of the ring and the top of the sphere coincide as shown. The total charged induced on the sphere | |
| 6626. |
A mass M is lowered with the help of a string by a distance h at a constant acceleration g2. The work done by string will be |
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Answer» A mass M is lowered with the help of a string by a distance h at a constant acceleration g2. The work done by string will be |
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| 6627. |
An oil of viscosity 8 poise flows between two parallel fixed plates which are kept at 60 mm distance. The pressure drop over the length of 150 cm is observed to be 4.5 kPa. The width of the plates is 0.2 m. The discharge of flow (in lps) is_______.[Assume laminar flow.]13.5 |
Answer» An oil of viscosity 8 poise flows between two parallel fixed plates which are kept at 60 mm distance. The pressure drop over the length of 150 cm is observed to be 4.5 kPa. The width of the plates is 0.2 m. The discharge of flow (in lps) is_______.[Assume laminar flow.]
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| 6628. |
A point object is placed in front of an equi- convex lens, of refractive index 1.5 and focal length 20 cm , at a distance 10 cm from the lens. If the farther side of the lens from the object is silvered then find the image distance from the lens |
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Answer» A point object is placed in front of an equi- convex lens, of refractive index 1.5 and focal length 20 cm , at a distance 10 cm from the lens. If the farther side of the lens from the object is silvered then find the image distance from the lens |
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| 6629. |
Two identical photo-cathodes receive light of frequencies f1 and f2. If the velocities of the photo electrons (of mass m) coming out are respectively v1 and v2, then |
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Answer» Two identical photo-cathodes receive light of frequencies f1 and f2. If the velocities of the photo electrons (of mass m) coming out are respectively v1 and v2, then |
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| 6630. |
Once a zero potential energy reference state is chosen, the changes in potential energy for a given initial and final states |
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Answer» Once a zero potential energy reference state is chosen, the changes in potential energy for a given initial and final states |
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| 6631. |
Give scientific reason.A wet cloth is wrapped around a water storage container in summer. |
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Answer» Give scientific reason. |
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| 6632. |
In reference to a frame e fixed to Sun is the gravitational force acting on the planet is equal to centripetal force m v²/r, where v is speed of planet and r is distance between sun and planet |
| Answer» In reference to a frame e fixed to Sun is the gravitational force acting on the planet is equal to centripetal force m v²/r, where v is speed of planet and r is distance between sun and planet | |
| 6633. |
A transverse pulse generated at the bottom of the uniform vertical rope of length L travels in upward direction. The time taken by the pulse to reach the top of the rope will be : |
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Answer» A transverse pulse generated at the bottom of the uniform vertical rope of length L travels in upward direction. The time taken by the pulse to reach the top of the rope will be : |
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| 6634. |
Which of the following relations is correct with regards to electric and magnetic field oscillation vector in case of EM waves (wave is propagating in the x direction)? |
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Answer» Which of the following relations is correct with regards to electric and magnetic field oscillation vector in case of EM waves (wave is propagating in the x direction)? |
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| 6635. |
An object weighs 80 g in air and 64 g in water. Find its relative density. |
| Answer» An object weighs 80 g in air and 64 g in water. Find its relative density. | |
| 6636. |
A block of mass m starts from rest at height h on a frictionless inclined plane. The block slides down the plane. Travels a distance d on a rough horizontal surface (before coming to rest for the first time) with co-efficient of kinetic friction μ & compresses a spring with force constant k through a distance x before momentarily coming to rest. Then the block travels back across the rough surface, sliding up the plane. The correct expression for the maximum height h' which the block reaches on its return |
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Answer» A block of mass m starts from rest at height h on a frictionless inclined plane. The block slides down the plane. Travels a distance d on a rough horizontal surface (before coming to rest for the first time) with co-efficient of kinetic friction μ & compresses a spring with force constant k through a distance x before momentarily coming to rest. Then the block travels back across the rough surface, sliding up the plane. The correct expression for the maximum height h' which the block reaches on its return
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| 6637. |
The capacitor plates are fixed on an inclined plane and connected to a battery of e.m.f. E. The capacitor plates have area A, length l and the distance between them is d. A dielectric slab of mass m and dielectric constant k is inserted into the capacitor and tied to a mass M by a massless string as shown in the figure. Find the value of M for which the slab will stay in equilibrium. There is no friction between slab and plates. |
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Answer» The capacitor plates are fixed on an inclined plane and connected to a battery of e.m.f. E. The capacitor plates have area A, length l and the distance between them is d. A dielectric slab of mass m and dielectric constant k is inserted into the capacitor and tied to a mass M by a massless string as shown in the figure. Find the value of M for which the slab will stay in equilibrium. There is no friction between slab and plates. |
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| 6638. |
The flow velocity of a river increases linearly with the distance (r) from its bank and has its maximum value v0 in the middle of the river. The velocity near the bank is zero. A boat which can move with speed u in still water moves in the river in such a way that it is always perpendicular to the flow of current. Find (i) The distance along the bank through which boat is carried away by the flow current, when the boat crosses the river. (ii) The equation of trajectory for the coordinate system shown. Assume that the swimmer starts from origin. |
Answer» The flow velocity of a river increases linearly with the distance (r) from its bank and has its maximum value v0 in the middle of the river. The velocity near the bank is zero. A boat which can move with speed u in still water moves in the river in such a way that it is always perpendicular to the flow of current. Find (i) The distance along the bank through which boat is carried away by the flow current, when the boat crosses the river. (ii) The equation of trajectory for the coordinate system shown. Assume that the swimmer starts from origin. |
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| 6639. |
For the given curve between reactance (X) and frequency (f) of a series LCR circuit, the resonant frequency is -Take dimensions of one square box as 1 unit. |
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Answer» For the given curve between reactance (X) and frequency (f) of a series LCR circuit, the resonant frequency is - |
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| 6640. |
A stationary cylinder of oxygen used in a hospital has the following characteristics at room temperature 300 K, gauge pressure 1.38×107Pa, volume 16 L. If the flow rate, measured at atmospheric pressure, is constant at 2.4 L/min, the cylinder will last for nearly |
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Answer» A stationary cylinder of oxygen used in a hospital has the following characteristics at room temperature 300 K, gauge pressure 1.38×107Pa, volume 16 L. If the flow rate, measured at atmospheric pressure, is constant at 2.4 L/min, the cylinder will last for nearly |
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| 6641. |
Why is the angle of declination greater at places located near the poles as compared to that of places located near the equator? |
| Answer» Why is the angle of declination greater at places located near the poles as compared to that of places located near the equator? | |
| 6642. |
3.0 g of an ideal gas A, when placed in an evacuated vessel at 27 ∘C exerts a pressure of 1.5 atm. When 9.0 g of another ideal gas B, non- reacting with A, is introduced in the same vessel pressure becomes 2.0 atm. What is the ratio between the average speeds of A and B at the same temperature? |
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Answer» 3.0 g of an ideal gas A, when placed in an evacuated vessel at 27 ∘C exerts a pressure of 1.5 atm. When 9.0 g of another ideal gas B, non- reacting with A, is introduced in the same vessel pressure becomes 2.0 atm. What is the ratio between the average speeds of A and B at the same temperature? |
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| 6643. |
A physical quantity X is expressed as velocity =√(Xdensity). The dimensions of X are |
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Answer» A physical quantity X is expressed as velocity =√(Xdensity). The dimensions of X are |
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| 6644. |
From the given table data of resistane Vs temperature for an RTD the linear approximation of resistance between 100∘C & 130∘C about a mean temperature of 115∘C is Temperature (in∘C)Resistance (in Ω)100573.40105578.77110584.13115589.48120594.84125600.18130605.52 |
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Answer» From the given table data of resistane Vs temperature for an RTD the linear approximation of resistance between 100∘C & 130∘C about a mean temperature of 115∘C is |
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| 6645. |
A charge Q is distributed uniformly within the material of a hollow sphere of inner and outer radii r1 and r2 (figure 30-E4). Find the electric field at a point P a distance x away from the centre for r1<x<r2. Draw a rough showing the electric field as a function of x for 0<x<2r2 (figure 30-E4). |
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Answer» A charge Q is distributed uniformly within the material of a hollow sphere of inner and outer radii r1 and r2 (figure 30-E4). Find the electric field at a point P a distance x away from the centre for r1<x<r2. Draw a rough showing the electric field as a function of x for 0<x<2r2 (figure 30-E4).
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| 6646. |
Two sound waves of wavelengths λ1 and λ2 (λ2>λ1) produce n beats per second. Then, the speed of sound is |
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Answer» Two sound waves of wavelengths λ1 and λ2 (λ2>λ1) produce n beats per second. Then, the speed of sound is |
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| 6647. |
A uniform bar of length L carries a current I in the direction from point a to b. The bar is in uniform magnetic field directed normally inwards. Torque acting on the rod due to magnetic field, about point a, is |
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Answer» A uniform bar of length L carries a current I in the direction from point a to b. The bar is in uniform magnetic field directed normally inwards. Torque acting on the rod due to magnetic field, about point a, is |
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| 6648. |
17.Four charges +q; -q; +q; -q; are placed in order on the four consecutive corners of a square of side L. The work done in interchanging the position of any Two neighbouring charges of opposite sign is |
| Answer» 17.Four charges +q; -q; +q; -q; are placed in order on the four consecutive corners of a square of side L. The work done in interchanging the position of any Two neighbouring charges of opposite sign is | |
| 6649. |
A converging lens and a diverging mirror are placed at a separation of 15 cm. The focal length of the lens is 25 cm and that of the mirror is 40 cm. Where should a point source be placed between the lens and the mirror so that the light, after getting reflected by the mirror and then getting transmitted by the lens, comes out parallel to the principal axis ? |
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Answer» A converging lens and a diverging mirror are placed at a separation of 15 cm. The focal length of the lens is 25 cm and that of the mirror is 40 cm. Where should a point source be placed between the lens and the mirror so that the light, after getting reflected by the mirror and then getting transmitted by the lens, comes out parallel to the principal axis ? |
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| 6650. |
A block of mass 1 kg lies on a horizontal surface in a truck. The coefficient of static friction between the block and the surface is 0.6. If the acceleration of the truck is 5 m/s2, the frictional force acting on the block is,[Take g=10 m/s2] |
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Answer» A block of mass 1 kg lies on a horizontal surface in a truck. The coefficient of static friction between the block and the surface is 0.6. If the acceleration of the truck is 5 m/s2, the frictional force acting on the block is, |
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