9478 + Interview Questions in Physics Page 8 InterviewSolution

351.	Explain why we always see the same side of the moon.
Answer» Explain why we always see the same side of the moon.

Discussion

352.	A body is pivoted at a point. A force of 20 N is applied at a distance of 20 cm from the pivot. Calculate the moment of force about the pivot.
Answer» A body is pivoted at a point. A force of $20 N$ is applied at a distance of $20 c m$ from the pivot. Calculate the moment of force about the pivot.

Discussion

353.	According to mirror formula, the correct relation between the image distance (v), object distance (u) and the focal length (f) is:
Answer» According to mirror formula, the correct relation between the image distance $(v)$ , object distance $(u)$ and the focal length $(f)$ is:

Discussion

354.	_____is the energy of random motion of constituent molecules constituting the body. It flows from a hot body to a cold body.
Answer» _____is the energy of random motion of constituent molecules constituting the body. It flows from a hot body to a cold body.

354.

_____is the energy of random motion of constituent molecules constituting the body. It flows from a hot body to a cold body.

Answer»

_____is the energy of random motion of constituent molecules constituting the body. It flows from a hot body to a cold body.

Discussion

355.	148.A missile is launched at an angle 60^° to the vertical with a velocity (.75gR) from the surface of the earth ( R is radius of earth). Find its maximum height from the surface of the earth.
Answer» 148.A missile is launched at an angle 60^° to the vertical with a velocity (.75gR) from the surface of the earth ( R is radius of earth). Find its maximum height from the surface of the earth.

Discussion

356.	38. A vessel has 6gm of oxygen at a pressure P and temp 400k.A small hole is made in it so that o2 leaks out .How much o2 leaks out if the pressure is p/2 and temp 300k?
Answer» 38. A vessel has 6gm of oxygen at a pressure P and temp 400k.A small hole is made in it so that o2 leaks out .How much o2 leaks out if the pressure is p/2 and temp 300k?

Discussion

357.	y = (5x^2 + 6)(2x^3 + 4) then dy/dx is
Answer» y = (5x^2 + 6)(2x^3 + 4) then dy/dx is

Discussion

358.	The role of a lightning rod on top of a building is to :
Answer» The role of a lightning rod on top of a building is to :

Discussion

359.	Pl explain the following statement The effective value of a.c. current for heat dissipation is equal to d.c. current which produces same heat as due to a.c.
Answer» Pl explain the following statement The effective value of a.c. current for heat dissipation is equal to d.c. current which produces same heat as due to a.c.

Discussion

360.	What is the value of 4 to the power .5
Answer» What is the value of 4 to the power .5

Discussion

361.	Will you be able to drink water in space using a straw? Why/why not?
Answer» Will you be able to drink water in space using a straw? Why/why not?

Discussion

362.	1. Acidified water is electrolysed using inert electrodes.The total volume of gases collected at cathode and anode is V ml at STP.The amount of charge passed in the electrolytic cell is equal to.
Answer» 1. Acidified water is electrolysed using inert electrodes.The total volume of gases collected at cathode and anode is V ml at STP.The amount of charge passed in the electrolytic cell is equal to.

Discussion

363.	Unit of pressure is
Answer» Unit of pressure is

Discussion

364.	A book of mass 980 g is placed on a table. Calculate the force exerted on the book in gravitational metric system in kgf.0.98
Answer» A book of mass $980 g$ is placed on a table. Calculate the force exerted on the book in gravitational metric system in $kgf$ . 0.98

Discussion

365.	Match the defects of vision in Part A with an appropriate remedy in Part B. PART APART B1)Myopiaa) Convex lens2)Hypermetropiab) Surgery3)Presbyopiac) Concave lens4)Cataractd) Bifocal lens
Answer» Match the defects of vision in Part A with an appropriate remedy in Part B. $\begin{matrix} PART A & PART B 1)Myopia & a) Convex lens 2)Hypermetropia & b) Surgery 3)Presbyopia & c) Concave lens 4)Cataract & d) Bifocal lens \end{matrix}$

365.

Match the defects of vision in Part A with an appropriate remedy in Part B. PART APART B1)Myopiaa) Convex lens2)Hypermetropiab) Surgery3)Presbyopiac) Concave lens4)Cataractd) Bifocal lens

Answer»

Match the defects of vision in Part A with an appropriate remedy in Part B.

$\begin{matrix} PART A & PART B 1)Myopia & a) Convex lens 2)Hypermetropia & b) Surgery 3)Presbyopia & c) Concave lens 4)Cataract & d) Bifocal lens \end{matrix}$

Discussion

366.	how can a massless object have energyLike a spring has P.E. when it is massless=0.5kx^2.But im not being able to unders†an d that if the object is massless,then where is the energy stored
Answer» how can a massless object have energyLike a spring has P.E. when it is massless=0.5kx^2.But im not being able to unders†an d that if the object is massless,then where is the energy stored

Discussion

367.	Who invented electricity?
Answer» Who invented electricity?

Discussion

368.	130.Obtain the formula for the electric field due to a long thin wire of uniform charged density.
Answer» 130.Obtain the formula for the electric field due to a long thin wire of uniform charged density.

Discussion

369.	Find the solution to the inequation (x-3)^2 (x-5)>0
Answer» Find the solution to the inequation (x-3)^2 (x-5)>0

Discussion

370.	Why is it difficult for us to see Mercury because of its being on the horizon?
Answer» Why is it difficult for us to see Mercury because of its being on the horizon?

Discussion

371.	how to find 5th root of a number
Answer» how to find 5th root of a number

Discussion

372.	Calculate the wavelength of matter wave associated with small ball of mass of 100g travelling at a velocity of 35ms^-1.
Answer» Calculate the wavelength of matter wave associated with small ball of mass of 100g travelling at a velocity of 35ms^-1.

Discussion

373.	Equation of motion in the same direction is given by y1=Asin(wt-kx), y2=Asin(wt-kx-theta) The amplitude of the med particle will be
Answer» Equation of motion in the same direction is given by y1=Asin(wt-kx), y2=Asin(wt-kx-theta) The amplitude of the med particle will be

Discussion

374.	A particle is dropped from the top of a towe. During its motion it coversthe last 1 second Then find the height of towerpart of height of tower
Answer» A particle is dropped from the top of a towe. During its motion it coversthe last 1 second Then find the height of towerpart of height of tower

Discussion

375.	If the radius of curvature of a concave mirror is 20 cm, then its focal length is:10
Answer» If the radius of curvature of a concave mirror is 20 cm, then its focal length is: 10

Discussion

376.	Question 12A boy is moving on a straight road against a frictional force of 5 N. After travelling a distance of 1.5 km he forgot the correct path at a round about of radius 100 m. However, he moves on the circular path for one and a half cycle and then he moves forward up to 2.0 km. Calculate the work done by him.
Answer» Question 12 A boy is moving on a straight road against a frictional force of 5 N. After travelling a distance of 1.5 km he forgot the correct path at a round about of radius 100 m. However, he moves on the circular path for one and a half cycle and then he moves forward up to 2.0 km. Calculate the work done by him.

Discussion

377.	Check wether 6-√5 is rational or irrational number.
Answer» Check wether 6-√5 is rational or irrational number.

Discussion

378.	Explain in your own words giving one example each.Muscular force, gravitational force, mechanical force, electrostatic force, the force of friction and magnetic force.
Answer» Explain in your own words giving one example each. Muscular force, gravitational force, mechanical force, electrostatic force, the force of friction and magnetic force.

Discussion

379.	Anoop placed a cuboid of dimensions 12cm×8cm×6cmwith different faces touching the table will experience the greatest pressure
Answer» Anoop placed a cuboid of dimensions 12cm×8cm×6cmwith different faces touching the table will experience the greatest pressure

Discussion

380.	How to know parallel and series circuits in a combination of circuits.
Answer» How to know parallel and series circuits in a combination of circuits.

Discussion

381.	The loudness of sound is measured in ___ .
Answer» The loudness of sound is measured in ___ .

Discussion

382.	Mnemonic for STANDARD REDUCTION POTENTIAL TABLE
Answer» Mnemonic for STANDARD REDUCTION POTENTIAL TABLE

Discussion

383.	what is 1. force 2. centripetal force 3. centrifugal force 4. inertia 5. momentum 6. newton first,second &third law of motion 7.impulse 8. law of conservation of momentum 9. equilibrium of concurrent forces 10. friction 11.law of friction 12.rolling friction 13. static friction 14. kinetic friction.
Answer» what is 1. force 2. centripetal force 3. centrifugal force 4. inertia 5. momentum 6. newton first,second &third law of motion 7.impulse 8. law of conservation of momentum 9. equilibrium of concurrent forces 10. friction 11.law of friction 12.rolling friction 13. static friction 14. kinetic friction.

Discussion

384.	Two cylindrical conductors with equal cross sections and different resistivities †extparagraph_1 and †extparagraph_{2 } are put end to end. Find the density of surface charges at the boundary of the conductor if a current I flows from conductor 1 to conductor 2.
Answer» Two cylindrical conductors with equal cross sections and different resistivities †extparagraph_1 and †extparagraph_{2 } are put end to end. Find the density of surface charges at the boundary of the conductor if a current I flows from conductor 1 to conductor 2.

Discussion

385.	Differentiate between contact and non contact force?
Answer» Differentiate between contact and non contact force?

Discussion

386.	The atmospheric pressure at a place is 105 Pa. If tribromomethane (specific gravity = 2.9) be employed as the barometric liquid, the barometric height is
Answer» The atmospheric pressure at a place is 105 Pa. If tribromomethane (specific gravity = 2.9) be employed as the barometric liquid, the barometric height is

Discussion

387.	During midnight in an abandoned house suddenly the glass of a window breaks. What could be the possible reason for this?
Answer» During midnight in an abandoned house suddenly the glass of a window breaks. What could be the possible reason for this?

Discussion

388.	state two examples for reducing friction while playing carrom board is helpful
Answer» state two examples for reducing friction while playing carrom board is helpful

Discussion

389.	A ray of light is incident at an angle of 450 on a square slab of a transparent material. What should be the refractive index of the material of the slab so that total internal reflection occurs at the vertical face AB.
Answer» A ray of light is incident at an angle of $45^{0}$ on a square slab of a transparent material. What should be the refractive index of the material of the slab so that total internal reflection occurs at the vertical face AB.

Discussion

390.	Name two natural disasters and explain the cause of one.[3 MARKS]
Answer» Name two natural disasters and explain the cause of one.[3 MARKS]

Discussion

391.	A mercury barometer reads h mm Hg with the temperature of the mercury at ToC. The barometer reading corrected for the standard temperature 0oC with β denoting the volumetric expansion coefficient of mercury in 0oC, is
Answer» A mercury barometer reads h mm Hg with the temperature of the mercury at T $^{o} C$ . The barometer reading corrected for the standard temperature 0 $^{o} C$ with $β$ denoting the volumetric expansion coefficient of mercury in 0 $^{o} C$ , is

Discussion

392.	What is the range of ultrasonic vibration ?
Answer» What is the range of ultrasonic vibration ?

Discussion

393.	At what angle with the normal should a light beam fall on the surface of a material with refractive index √3, if the angle of refraction was half the angle of incidence?
Answer» At what angle with the normal should a light beam fall on the surface of a material with refractive index $\sqrt{3}$ , if the angle of refraction was half the angle of incidence?

Discussion

394.	A beaker is filled with a liquid of density p upto a height h. If the beaker is at rest, the mean pressure on the walls is (g= 9.8 if required) ?
Answer» A beaker is filled with a liquid of density p upto a height h. If the beaker is at rest, the mean pressure on the walls is (g= 9.8 if required) ?

Discussion

395.	A black hole is an object whose gravitational field is so strong that even light cannot escape from it.To what approximate radius would earthhave to be compressed to be a black whole
Answer» A black hole is an object whose gravitational field is so strong that even light cannot escape from it.To what approximate radius would earthhave to be compressed to be a black whole

Discussion

396.	Whatis the radius of the biggest aluminum coin of thickness, t and density ρ, which will still be able to float on the watersurface of surface tension S?
Answer» What is the radius of the biggest aluminum coin of thickness, t and density ρ, which will still be able to float on the water surface of surface tension S?

Discussion

397.	Why is the surface of a glass made shiny when making a mirror?
Answer» Why is the surface of a glass made shiny when making a mirror?

Discussion

398.	How many planets in our solar system have rings
Answer» How many planets in our solar system have rings

Discussion

399.	What is moonlight?
Answer» What is moonlight?

Discussion

400.	If the ratio of amplitudes of two sound waves is 13, then what should be the ratio of their intensities?
Answer» If the ratio of amplitudes of two sound waves is $\frac{1}{3}$ , then what should be the ratio of their intensities?

Discussion

Explore topic-wise InterviewSolutions in .

Explain why we always see the same side of the moon.

A body is pivoted at a point. A force of 20 N is applied at a distance of 20 cm from the pivot. Calculate the moment of force about the pivot.

According to mirror formula, the correct relation between the image distance (v), object distance (u) and the focal length (f) is:

_____is the energy of random motion of constituent molecules constituting the body. It flows from a hot body to a cold body.

148.A missile is launched at an angle 60^° to the vertical with a velocity (.75gR) from the surface of the earth ( R is radius of earth). Find its maximum height from the surface of the earth.

38. A vessel has 6gm of oxygen at a pressure P and temp 400k.A small hole is made in it so that o2 leaks out .How much o2 leaks out if the pressure is p/2 and temp 300k?

y = (5x^2 + 6)(2x^3 + 4) then dy/dx is

The role of a lightning rod on top of a building is to :

Pl explain the following statement The effective value of a.c. current for heat dissipation is equal to d.c. current which produces same heat as due to a.c.

What is the value of 4 to the power .5

Will you be able to drink water in space using a straw? Why/why not?

1. Acidified water is electrolysed using inert electrodes.The total volume of gases collected at cathode and anode is V ml at STP.The amount of charge passed in the electrolytic cell is equal to.

Unit of pressure is

A book of mass 980 g is placed on a table. Calculate the force exerted on the book in gravitational metric system in kgf.0.98

Match the defects of vision in Part A with an appropriate remedy in Part B. PART APART B1)Myopiaa) Convex lens2)Hypermetropiab) Surgery3)Presbyopiac) Concave lens4)Cataractd) Bifocal lens

how can a massless object have energyLike a spring has P.E. when it is massless=0.5kx^2.But im not being able to unders†an d that if the object is massless,then where is the energy stored

Who invented electricity?

130.Obtain the formula for the electric field due to a long thin wire of uniform charged density.

Find the solution to the inequation (x-3)^2 (x-5)>0

Why is it difficult for us to see Mercury because of its being on the horizon?

how to find 5th root of a number

Calculate the wavelength of matter wave associated with small ball of mass of 100g travelling at a velocity of 35ms^-1.

Equation of motion in the same direction is given by y1=Asin(wt-kx), y2=Asin(wt-kx-theta) The amplitude of the med particle will be

A particle is dropped from the top of a towe. During its motion it coversthe last 1 second Then find the height of towerpart of height of tower

If the radius of curvature of a concave mirror is 20 cm, then its focal length is:10

Check wether 6-√5 is rational or irrational number.

Explain in your own words giving one example each.Muscular force, gravitational force, mechanical force, electrostatic force, the force of friction and magnetic force.

Anoop placed a cuboid of dimensions 12cm×8cm×6cmwith different faces touching the table will experience the greatest pressure

How to know parallel and series circuits in a combination of circuits.

The loudness of sound is measured in ___ .

Mnemonic for STANDARD REDUCTION POTENTIAL TABLE

Two cylindrical conductors with equal cross sections and different resistivities †extparagraph_1 and †extparagraph_{2 } are put end to end. Find the density of surface charges at the boundary of the conductor if a current I flows from conductor 1 to conductor 2.

Differentiate between contact and non contact force?

The atmospheric pressure at a place is 105 Pa. If tribromomethane (specific gravity = 2.9) be employed as the barometric liquid, the barometric height is

During midnight in an abandoned house suddenly the glass of a window breaks. What could be the possible reason for this?

state two examples for reducing friction while playing carrom board is helpful

A ray of light is incident at an angle of 450 on a square slab of a transparent material. What should be the refractive index of the material of the slab so that total internal reflection occurs at the vertical face AB.

Name two natural disasters and explain the cause of one.[3 MARKS]

A mercury barometer reads h mm Hg with the temperature of the mercury at ToC. The barometer reading corrected for the standard temperature 0oC with β denoting the volumetric expansion coefficient of mercury in 0oC, is

What is the range of ultrasonic vibration ?

At what angle with the normal should a light beam fall on the surface of a material with refractive index √3, if the angle of refraction was half the angle of incidence?

A beaker is filled with a liquid of density p upto a height h. If the beaker is at rest, the mean pressure on the walls is (g= 9.8 if required) ?

A black hole is an object whose gravitational field is so strong that even light cannot escape from it.To what approximate radius would earthhave to be compressed to be a black whole

Whatis the radius of the biggest aluminum coin of thickness, t and density ρ, which will still be able to float on the watersurface of surface tension S?

Why is the surface of a glass made shiny when making a mirror?

How many planets in our solar system have rings

What is moonlight?

If the ratio of amplitudes of two sound waves is 13, then what should be the ratio of their intensities?