16569 + Interview Questions in Physics Page 10 InterviewSolution

451.	A long straight wire of radius a carries a steady current i. The current is uniformly distributed across its cross section. The ratio of magnetic field at a/4 inside and a/4 outside from the surface of wire is
Answer» A long straight wire of radius a carries a steady current i. The current is uniformly distributed across its cross section. The ratio of magnetic field at a/4 inside and a/4 outside from the surface of wire is

Discussion

452.	"What was Chipko Andolan" ? How did this Andolan ultimately benefit the local people and the environment ?
Answer» "What was Chipko Andolan" ? How did this Andolan ultimately benefit the local people and the environment ?

Discussion

453.	An iron cylinder of length 10 cm has a diameter of 8 cm. What is the volume of the cylinder?
Answer» An iron cylinder of length $10 cm$ has a diameter of $8 cm$ . What is the volume of the cylinder?

Discussion

454.	ZCALCULATR THE THRESHOLD FREQUENCY OF METAL IF BINDING ENRRGY IS180.69kJ/mol OF ELECTRO
Answer» ZCALCULATR THE THRESHOLD FREQUENCY OF METAL IF BINDING ENRRGY IS180.69kJ/mol OF ELECTRO

Discussion

455.	19. A plano convex lens of focal length 30 cm has its plane surface silvered. An object is placed at 40 cm from the lens on convex side. The distance of image from the lens is
Answer» 19. A plano convex lens of focal length 30 cm has its plane surface silvered. An object is placed at 40 cm from the lens on convex side. The distance of image from the lens is

Discussion

456.	An electric oven of 2 kW is operated in a domestic electric circuit (220 V) that has a current rating of 5 A. What result do you expect? Explain.
Answer» An electric oven of 2 kW is operated in a domestic electric circuit (220 V) that has a current rating of 5 A. What result do you expect? Explain.

Discussion

457.	A block is kept on a horizontal table. The table is undergoing SHM of frequency 3Hz in a horizontal place. The coefficient of static friction between block and table surface is 0.72 . Find the Maximum amplitude of the table in such block doesn't slip on the surface 2cm 2.5cm 3cm 4cm
Answer» A block is kept on a horizontal table. The table is undergoing SHM of frequency 3Hz in a horizontal place. The coefficient of static friction between block and table surface is 0.72 . Find the Maximum amplitude of the table in such block doesn't slip on the surface 2cm 2.5cm 3cm 4cm

Discussion

458.	What is an alternator?
Answer» What is an alternator?

Discussion

459.	35. A light of wavelengthgets rotracted from vacuumto a medium of retractive index n. The, ratio ofwavelengths af incidant and refracted wave is(1) 1n(3) n:(4) 1
Answer» 35. A light of wavelengthgets rotracted from vacuumto a medium of retractive index n. The, ratio ofwavelengths af incidant and refracted wave is(1) 1n(3) n:(4) 1

Discussion

460.	4. What is the power of an electric equipment in which 2 Columb pass current in 2 second and the resistance is 8 ohm?
Answer» 4. What is the power of an electric equipment in which 2 Columb pass current in 2 second and the resistance is 8 ohm?

Discussion

461.	The refractive indices of flint glass for red and violet lights are 1.613 and 1.632 respectively. Find the angular dispersion produced by a thin prism of flint glass having refracting angle 5∘.
Answer» The refractive indices of flint glass for red and violet lights are $1.613$ and $1.632$ respectively. Find the angular dispersion produced by a thin prism of flint glass having refracting angle $5^{\circ}$ .

Discussion

462.	Why does wind flow?
Answer» Why does wind flow?

Discussion

463.	A100W and 200W domestic bulb are connected to mains which bulb will glow more brightly when bulbs are joined(1) in series (2)in paralleland why
Answer» A100W and 200W domestic bulb are connected to mains which bulb will glow more brightly when bulbs are joined(1) in series (2)in paralleland why

Discussion

464.	A flat coil ABCD is freely suspended between the poles of a U-shaped permanent magnet with the plane of coil parallel to the magnetic field. (a) What happens when a current is passed in the coil ? (b) When will the coil come to rest ? (c) When will the couple acting on the coil be (i) maximum, and (ii) minimum ? (d) Name an instrument which makes use of the principle stated above.
Answer» A flat coil ABCD is freely suspended between the poles of a U-shaped permanent magnet with the plane of coil parallel to the magnetic field. (a) What happens when a current is passed in the coil ? (b) When will the coil come to rest ? (c) When will the couple acting on the coil be (i) maximum, and (ii) minimum ? (d) Name an instrument which makes use of the principle stated above.

Discussion

465.	Determine the force that must be applied to end of the class 1 lever shown below to lift the 500 lb load.
Answer» Determine the force that must be applied to end of the class 1 lever shown below to lift the 500 lb load.

465.

Determine the force that must be applied to end of the class 1 lever shown below to lift the 500 lb load.

Answer»

Determine the force that must be applied to end of the class 1 lever shown below to lift the 500 lb load.

Discussion

466.	How will you connect three resistors of 3 Ohm, 4 Ohm and 7 Ohm respectively so as to obtain a resultant resistance of 3.5 Ohm?
Answer» How will you connect three resistors of 3 Ohm, 4 Ohm and 7 Ohm respectively so as to obtain a resultant resistance of 3.5 Ohm?

466.

How will you connect three resistors of 3 Ohm, 4 Ohm and 7 Ohm respectively so as to obtain a resultant resistance of 3.5 Ohm?

Answer»

How will you connect three resistors of 3 Ohm, 4 Ohm and 7 Ohm respectively so as to obtain a resultant resistance of 3.5 Ohm?

Discussion

467.	Resistors R1, R2 are connected in parallel. If the power dissipated by them is P1,P2 then
Answer» Resistors $R_{1}, R_{2}$ are connected in parallel. If the power dissipated by them is $P_{1}, P_{2}$ then

Discussion

468.	What is the maximum resistance which can be obtained by using 5 resistors each of 1/10 ohm?
Answer» What is the maximum resistance which can be obtained by using 5 resistors each of 1/10 ohm?

Discussion

469.	A body of mass 50 kg has a momentum of 3000 kg ms-1. The velocity and the kinetic energy of the body is
Answer» A body of mass 50 kg has a momentum of 3000 kg ms^-1. The velocity and the kinetic energy of the body is

469.

A body of mass 50 kg has a momentum of 3000 kg ms-1. The velocity and the kinetic energy of the body is

Answer»

A body of mass 50 kg has a momentum of 3000 kg ms^-1. The velocity and the kinetic energy of the body is

Discussion

470.	When you keep objects very close to the eye the ciliary muscles ________.
Answer» When you keep objects very close to the eye the ciliary muscles ________.

Discussion

471.	Question 15 (c) State the rule to determine the direction of a (iii) current induced in a coil due to its rotation in a magnetic field.
Answer» Question 15 (c) State the rule to determine the direction of a (iii) current induced in a coil due to its rotation in a magnetic field.

Discussion

472.	How is charcoal prepared ? Explain why, charcoal is a better fuel than wood.
Answer» How is charcoal prepared ? Explain why, charcoal is a better fuel than wood.

Discussion

473.	15.The half life of radioactive substance is 10 days.What is the time taken for 3/4th of its original mass to disintegrate ?
Answer» 15.The half life of radioactive substance is 10 days.What is the time taken for 3/4th of its original mass to disintegrate ?

Discussion

474.	How much water (μ=4/3) should be filled in a container of height 21 cm, so that it appears half filled to the observer when viewed from the top of the container.
Answer» How much water $(μ = 4 / 3)$ should be filled in a container of height $21 cm$ , so that it appears half filled to the observer when viewed from the top of the container.

Discussion

475.	An e.m.f. of 15 V is applied in a circuit containing a 5 H inductance and a 10 Ω resistance. The ratio of the currents at time t=∞ and, at t=1 second is
Answer» An e.m.f. of $15 V$ is applied in a circuit containing a $5 H$ inductance and a $10 Ω$ resistance. The ratio of the currents at time $t = \infty$ and, at $t = 1 second$ is

Discussion

476.	Describe with the help of a ray diagram the nature, size and position of the image formed when an object is placed at infinity (considerable distance) in front of a convex lens. State three characteristics of the image so formed.
Answer» Describe with the help of a ray diagram the nature, size and position of the image formed when an object is placed at infinity (considerable distance) in front of a convex lens. State three characteristics of the image so formed.

Discussion

477.	Question 34Is water conservation necessary? Give reasons.
Answer» Question 34 Is water conservation necessary? Give reasons.

Discussion

478.	explanation of diffraction phenomenon.
Answer» explanation of diffraction phenomenon.

Discussion

479.	Two coils A and B, each of 10 turns and radius 20 cm,are held such that coil A lies in the yerticalplane and coil B in the horizontal plane with their centrescoinciding. What current should bepassed through the coils so as to nullify the earth'smagnetic field at their common centre?Horizontal component of earth's field= 0.314 x 10-9 Tand angle of dip 26.6^° . Given tan 26.6^° 0.5.
Answer» Two coils A and B, each of 10 turns and radius 20 cm,are held such that coil A lies in the yerticalplane and coil B in the horizontal plane with their centrescoinciding. What current should bepassed through the coils so as to nullify the earth'smagnetic field at their common centre?Horizontal component of earth's field= 0.314 x 10-9 Tand angle of dip 26.6^° . Given tan 26.6^° 0.5.

Discussion

480.	152 Two particles are executing simple harmonic motion of the same amplitude A and frequency "omega" along the X axis. Their mean position is seperated by distance X (X>A). If the maximum seperation between them is (X+A), the phase difference between their motion is:
Answer» 152 Two particles are executing simple harmonic motion of the same amplitude A and frequency "omega" along the X axis. Their mean position is seperated by distance X (X>A). If the maximum seperation between them is (X+A), the phase difference between their motion is:

Discussion

481.	A chain PQ of length 3h is loaded in a smoothhorizontal tube, so that its length h hangs freelyand touches the surface of the table with end Q. Ata certain moment, the end Pof chain is set free,velocity of end Pwhen it slips out of tube will be
Answer» A chain PQ of length 3h is loaded in a smoothhorizontal tube, so that its length h hangs freelyand touches the surface of the table with end Q. Ata certain moment, the end Pof chain is set free,velocity of end Pwhen it slips out of tube will be

Discussion

482.	A bob of mass 3 kg is attached with a light string of length R. If it is given an initial velocity u=√9gR at the bottom most point, the tension in the string at the topmost point is (Take g=10 m/s2)
Answer» A bob of mass $3 kg$ is attached with a light string of length $R$ . If it is given an initial velocity $u = \sqrt{9 g R}$ at the bottom most point, the tension in the string at the topmost point is (Take $g = 10 {m/s}^{2}$ )

Discussion

483.	27. A wire of length l is bent in the form of a circular coil of some turns. A current i flows through the coil. The coil is placed in a uniform magnetic field B .the maximum torque on the coil can be
Answer» 27. A wire of length l is bent in the form of a circular coil of some turns. A current i flows through the coil. The coil is placed in a uniform magnetic field B .the maximum torque on the coil can be

Discussion

484.	When angle of incident of the material is 60°, the reflected light is completely polarized. The velocity of refracted ray inside the material is (in m/s)
Answer» When angle of incident of the material is 60°, the reflected light is completely polarized. The velocity of refracted ray inside the material is (in m/s)

Discussion

485.	What is the intensity of sound of 100dB?
Answer» What is the intensity of sound of 100dB?

Discussion

486.	Magnetic flux through a closed surface is zero because the field lines entering the surface is equal to the field lines leaving the surface. So can't magnetic flux through a plain surface be zero?Number of field lines entering the plane surface can also be equal to the field lines leaving the plain surface.
Answer» Magnetic flux through a closed surface is zero because the field lines entering the surface is equal to the field lines leaving the surface. So can't magnetic flux through a plain surface be zero?Number of field lines entering the plane surface can also be equal to the field lines leaving the plain surface.

Discussion

487.	A bottle opener acts as a:
Answer» A bottle opener acts as a:

Discussion

488.	At the interface of two transparent mediums at the point of incidence, the incident ray, the refracted ray and the normal all lie in _____.
Answer» At the interface of two transparent mediums at the point of incidence, the incident ray, the refracted ray and the normal all lie in _____.

Discussion

489.	A wire of resistance 9 ohm is bent in the form of equilateral triangle the equivalent resistance between any two of its vertices will be what
Answer» A wire of resistance 9 ohm is bent in the form of equilateral triangle the equivalent resistance between any two of its vertices will be what

Discussion

490.	Which of the following can be explained by the universal law of gravitation?
Answer» Which of the following can be explained by the universal law of gravitation?

Discussion

491.	72.Charge of an electron is e and mass m the electron is moving around a nucleus of charge Ze in a circular path of radius r.what will be the velocity of the electron?
Answer» 72.Charge of an electron is e and mass m the electron is moving around a nucleus of charge Ze in a circular path of radius r.what will be the velocity of the electron?

Discussion

492.	He was visually impaired.
Answer» He was visually impaired.

Discussion

493.	What would happen if the eye lens of a human eye was made of concave and not convex? even if the rays diverged we could see the apparent position of the image from extended rays..
Answer» What would happen if the eye lens of a human eye was made of concave and not convex? even if the rays diverged we could see the apparent position of the image from extended rays..

Discussion

494.	Two factors on which the heat absorbed or given out by a body depends are
Answer» Two factors on which the heat absorbed or given out by a body depends are

Discussion

495.	How dos the image get formed in convex and concave mirror if the object is placed horizontal to the principal axis ?
Answer» How dos the image get formed in convex and concave mirror if the object is placed horizontal to the principal axis ?

Discussion

496.	A DT signal is given as, g[n]=cos(πn3)[u[n]−u[n−6]]The energy of the signal is ______units. 3
Answer» A DT signal is given as, $g [n] = c o s (\frac{π n}{3}) [u [n] - u [n - 6]]$ The energy of the signal is ______units. 3

Discussion

497.	When should we consider mass of 1 molecule of water 18 grams
Answer» When should we consider mass of 1 molecule of water 18 grams

Discussion

498.	An object 2cm high produces a real image 3cm high when placed at a distance of 15cm from concave mirror . Calculate the position of the image
Answer» An object 2cm high produces a real image 3cm high when placed at a distance of 15cm from concave mirror . Calculate the position of the image

Discussion

499.	Explain functioning of AC generators
Answer» Explain functioning of AC generators

Discussion

500.	Two stones lying on the surface of the Earth have mass, a gravitational force will always exist between them and it will try to pull the stones towards each other. But actually, we don’t see the stones moving towards each other, why? Statement 1: The gravitational force is very less. Statement 2: Stones are lying on a flat surface, so they cannot move. Statement 3: The gravitational force is very less to overcome friction. Statement 4: The stones are irregular in shape, so they cannot move. Which statements explains the reason for the above question?
Answer» Two stones lying on the surface of the Earth have mass, a gravitational force will always exist between them and it will try to pull the stones towards each other. But actually, we don’t see the stones moving towards each other, why? Statement 1: The gravitational force is very less. Statement 2: Stones are lying on a flat surface, so they cannot move. Statement 3: The gravitational force is very less to overcome friction. Statement 4: The stones are irregular in shape, so they cannot move. Which statements explains the reason for the above question?

500.

Two stones lying on the surface of the Earth have mass, a gravitational force will always exist between them and it will try to pull the stones towards each other. But actually, we don’t see the stones moving towards each other, why? Statement 1: The gravitational force is very less. Statement 2: Stones are lying on a flat surface, so they cannot move. Statement 3: The gravitational force is very less to overcome friction. Statement 4: The stones are irregular in shape, so they cannot move. Which statements explains the reason for the above question?

Answer»

Two stones lying on the surface of the Earth have mass, a gravitational force will always exist between them and it will try to pull the stones towards each other. But actually, we don’t see the stones moving towards each other, why?

Statement 1: The gravitational force is very less.

Statement 2: Stones are lying on a flat surface, so they cannot move.

Statement 3: The gravitational force is very less to overcome friction.

Statement 4: The stones are irregular in shape, so they cannot move.

Which statements explains the reason for the above question?

Discussion

Explore topic-wise InterviewSolutions in .

A long straight wire of radius a carries a steady current i. The current is uniformly distributed across its cross section. The ratio of magnetic field at a/4 inside and a/4 outside from the surface of wire is

"What was Chipko Andolan" ? How did this Andolan ultimately benefit the local people and the environment ?

An iron cylinder of length 10 cm has a diameter of 8 cm. What is the volume of the cylinder?

ZCALCULATR THE THRESHOLD FREQUENCY OF METAL IF BINDING ENRRGY IS180.69kJ/mol OF ELECTRO

19. A plano convex lens of focal length 30 cm has its plane surface silvered. An object is placed at 40 cm from the lens on convex side. The distance of image from the lens is

An electric oven of 2 kW is operated in a domestic electric circuit (220 V) that has a current rating of 5 A. What result do you expect? Explain.

A block is kept on a horizontal table. The table is undergoing SHM of frequency 3Hz in a horizontal place. The coefficient of static friction between block and table surface is 0.72 . Find the Maximum amplitude of the table in such block doesn't slip on the surface 2cm 2.5cm 3cm 4cm

What is an alternator?

35. A light of wavelengthgets rotracted from vacuumto a medium of retractive index n. The, ratio ofwavelengths af incidant and refracted wave is(1) 1n(3) n:(4) 1

4. What is the power of an electric equipment in which 2 Columb pass current in 2 second and the resistance is 8 ohm?

The refractive indices of flint glass for red and violet lights are 1.613 and 1.632 respectively. Find the angular dispersion produced by a thin prism of flint glass having refracting angle 5∘.

Why does wind flow?

A100W and 200W domestic bulb are connected to mains which bulb will glow more brightly when bulbs are joined(1) in series (2)in paralleland why

Determine the force that must be applied to end of the class 1 lever shown below to lift the 500 lb load.

How will you connect three resistors of 3 Ohm, 4 Ohm and 7 Ohm respectively so as to obtain a resultant resistance of 3.5 Ohm?

Resistors R1, R2 are connected in parallel. If the power dissipated by them is P1,P2 then

What is the maximum resistance which can be obtained by using 5 resistors each of 1/10 ohm?

A body of mass 50 kg has a momentum of 3000 kg ms-1. The velocity and the kinetic energy of the body is

When you keep objects very close to the eye the ciliary muscles ________.

Question 15 (c) State the rule to determine the direction of a (iii) current induced in a coil due to its rotation in a magnetic field.

How is charcoal prepared ? Explain why, charcoal is a better fuel than wood.

15.The half life of radioactive substance is 10 days.What is the time taken for 3/4th of its original mass to disintegrate ?

How much water (μ=4/3) should be filled in a container of height 21 cm, so that it appears half filled to the observer when viewed from the top of the container.

An e.m.f. of 15 V is applied in a circuit containing a 5 H inductance and a 10 Ω resistance. The ratio of the currents at time t=∞ and, at t=1 second is

Describe with the help of a ray diagram the nature, size and position of the image formed when an object is placed at infinity (considerable distance) in front of a convex lens. State three characteristics of the image so formed.

Question 34Is water conservation necessary? Give reasons.

explanation of diffraction phenomenon.

152 Two particles are executing simple harmonic motion of the same amplitude A and frequency "omega" along the X axis. Their mean position is seperated by distance X (X>A). If the maximum seperation between them is (X+A), the phase difference between their motion is:

A chain PQ of length 3h is loaded in a smoothhorizontal tube, so that its length h hangs freelyand touches the surface of the table with end Q. Ata certain moment, the end Pof chain is set free,velocity of end Pwhen it slips out of tube will be

A bob of mass 3 kg is attached with a light string of length R. If it is given an initial velocity u=√9gR at the bottom most point, the tension in the string at the topmost point is (Take g=10 m/s2)

27. A wire of length l is bent in the form of a circular coil of some turns. A current i flows through the coil. The coil is placed in a uniform magnetic field B .the maximum torque on the coil can be

When angle of incident of the material is 60°, the reflected light is completely polarized. The velocity of refracted ray inside the material is (in m/s)

What is the intensity of sound of 100dB?

A bottle opener acts as a:

At the interface of two transparent mediums at the point of incidence, the incident ray, the refracted ray and the normal all lie in _____.

A wire of resistance 9 ohm is bent in the form of equilateral triangle the equivalent resistance between any two of its vertices will be what

Which of the following can be explained by the universal law of gravitation?

72.Charge of an electron is e and mass m the electron is moving around a nucleus of charge Ze in a circular path of radius r.what will be the velocity of the electron?

He was visually impaired.

What would happen if the eye lens of a human eye was made of concave and not convex? even if the rays diverged we could see the apparent position of the image from extended rays..

Two factors on which the heat absorbed or given out by a body depends are

How dos the image get formed in convex and concave mirror if the object is placed horizontal to the principal axis ?

A DT signal is given as, g[n]=cos(πn3)[u[n]−u[n−6]]The energy of the signal is ______units. 3

When should we consider mass of 1 molecule of water 18 grams

An object 2cm high produces a real image 3cm high when placed at a distance of 15cm from concave mirror . Calculate the position of the image

Explain functioning of AC generators