9478 + Interview Questions in Physics Page 103 InterviewSolution

5101.	Choose the correct alternative in the following question:If 2n=1024, then 2n2+2=a 64 b 128 c 256 d 512
Answer» Choose the correct alternative in the following question: $If 2^{n} = 1024, then 2^{(\frac{n}{2} + 2)} = (a) 64 (b) 128 (c) 256 (d) 512$

Discussion

5102.	(a) How should the electric lamps in a building be connected so that switching on or off in a room has no effect on other lamps in the building? State one or more advantage of such an arrangement.(b) Which effect of current is utilised in the working of an electric fuse? How does an electric fuse work?(c) What is the usual colour of the insulation of (i) earth wire, and (ii) live wire?(d) When does an electric short circuit occur? What harm can do it?(e) Explain the purpose of earthing an electrical appliance.
Answer» (a) How should the electric lamps in a building be connected so that switching on or off in a room has no effect on other lamps in the building? State one or more advantage of such an arrangement. (b) Which effect of current is utilised in the working of an electric fuse? How does an electric fuse work? (c) What is the usual colour of the insulation of (i) earth wire, and (ii) live wire? (d) When does an electric short circuit occur? What harm can do it? (e) Explain the purpose of earthing an electrical appliance.

Discussion

5103.	In an intrinsic semiconductor , the density of conduction electrons is 7.0710^15 m^-3 . When it is doped with indium , the density of holes becomes 510^22 m^-3. find the density of conduction electrons in doped semiconductor
Answer» In an intrinsic semiconductor , the density of conduction electrons is 7.0710^15 m^-3 . When it is doped with indium , the density of holes becomes 510^22 m^-3. find the density of conduction electrons in doped semiconductor

Discussion

5104.	A body of 10 kg is kept on a rough horizontal surface which can offer maximum frictional force or 40 N what will be the frictional force when applied force is 20 N?
Answer» A body of 10 kg is kept on a rough horizontal surface which can offer maximum frictional force or 40 N what will be the frictional force when applied force is 20 N?

Discussion

5105.	The kinetic energy of a particle depends on the square of speed of particle . If error in measurement of speed is 30%,the error in measurement of kinetic energy will be---?? 1\} 30% 2\} 60% 3\} 69% 4\} 15%
Answer» The kinetic energy of a particle depends on the square of speed of particle . If error in measurement of speed is 30%,the error in measurement of kinetic energy will be---?? 1\} 30% 2\} 60% 3\} 69% 4\} 15%

Discussion

5106.	A particle is at rest at t=0. If the acceleration of the particle is given as a=sinπt+cosπt, in SI units, then the maximum speed of the particle is
Answer» A particle is at rest at t=0. If the acceleration of the particle is given as a=sinπt+cosπt, in SI units, then the maximum speed of the particle is

Discussion

5107.	58.What is lazer beam of light and it is useful
Answer» 58.What is lazer beam of light and it is useful

Discussion

5108.	The change in speed (Q. 1) causes a change in the direction of the light ray. What change is observed when light goes from: a. air to water b. water to air?
Answer» The change in speed (Q. 1) causes a change in the direction of the light ray. What change is observed when light goes from: a. air to water b. water to air?

Discussion

5109.	104. A non conducting square plate of side length 2a is uniformly charged with Q and a point charge q is placed at perpendicular distance a as shown in figure. The electric force on the point charge due to plate is
Answer» 104. A non conducting square plate of side length 2a is uniformly charged with Q and a point charge q is placed at perpendicular distance a as shown in figure. The electric force on the point charge due to plate is

Discussion

5110.	When H+ ion moves from high concentration to low concentration in f0f1 particles why there is a release of energy?
Answer» When H+ ion moves from high concentration to low concentration in f0f1 particles why there is a release of energy?

Discussion

5111.	How the friction creat heat?
Answer» How the friction creat heat?

Discussion

5112.	The mass of the planet Mars is 6 × 1023 kg and radius is 4.3 × 106 m. Calculate the weight of a man on Mars whose weight on earth is 600 N. (Given g on earth = 10 msec2)
Answer» The mass of the planet Mars is 6 × $10^{23}$ kg and radius is 4.3 × $10^{6}$ m. Calculate the weight of a man on Mars whose weight on earth is 600 N. (Given g on earth = 10 $\frac{m}{{s e c}^{2}}$ )

Discussion

5113.	Which of the following consequences are the effects of atmospheric pressure?
Answer» Which of the following consequences are the effects of atmospheric pressure?

Discussion

5114.	The angle between the overlapping of one s orbital and one p orbital at the internuclear axis is1)1202)120degree28'3)180 4)109degree28'
Answer» The angle between the overlapping of one s orbital and one p orbital at the internuclear axis is 1)120 2)120degree28' 3)180 4)109degree28'

Discussion

5115.	Name these –(a) Birth place of stars(b) Biggest planet in the solar system(c) The galaxy which is our neighbour.(d) Brightest planet in the solar system(e) Planet with largest number of satellites(f) Planets without a single satellite(g) Planet with a rotation different from other planets.(h) A celestial body that carries a tail along
Answer» Name these – (a) Birth place of stars (b) Biggest planet in the solar system (c) The galaxy which is our neighbour. (d) Brightest planet in the solar system (e) Planet with largest number of satellites (f) Planets without a single satellite (g) Planet with a rotation different from other planets. (h) A celestial body that carries a tail along

Discussion

5116.	Name the physical state of matter that can be easily compressed and justify your answer.
Answer» Name the physical state of matter that can be easily compressed and justify your answer.

Discussion

5117.	Sound is a form of energy. Substantiate this statement with example. (5marks)
Answer» Sound is a form of energy. Substantiate this statement with example. (5marks)

Discussion

5118.	two celestial are separated by some dis†an ce .if the mass of any one of the point like bodies is double while the mass of other is halved then how far should they be taken so that the gravitational force between them become one fourth
Answer» two celestial are separated by some dis†an ce .if the mass of any one of the point like bodies is double while the mass of other is halved then how far should they be taken so that the gravitational force between them become one fourth

Discussion

5119.	Question 7What is the minimum resistance which can be made using five resistors each of 15Ω?(a) 15Ω(b) 125Ω(c) 110Ω(d) 25Ω
Answer» Question 7 What is the minimum resistance which can be made using five resistors each of $\frac{1}{5} Ω$ ? (a) $\frac{1}{5} Ω$ (b) $\frac{1}{25} Ω$ (c) $\frac{1}{10} Ω$ (d) $25 Ω$

Discussion

5120.	An engine can pull 4 coaches at a maximum speed of 20m/s. mass of enngine is twice that of every coach. assume resistive forces to be proportional to the weight. calculate maximum speeds of engines when it pulls 12 and 6 coaches respectively.
Answer» An engine can pull 4 coaches at a maximum speed of 20m/s. mass of enngine is twice that of every coach. assume resistive forces to be proportional to the weight. calculate maximum speeds of engines when it pulls 12 and 6 coaches respectively.

Discussion

5121.	A ray of light going from an optically rarer medium to an optically denser medium
Answer» A ray of light going from an optically rarer medium to an optically denser medium

Discussion

5122.	Surface charge density is inversely proportional to radius of curvature of conductor. What radius of curvature we would take for sharp points and edges? How surface charge density is very high at sharp points and edges
Answer» Surface charge density is inversely proportional to radius of curvature of conductor. What radius of curvature we would take for sharp points and edges? How surface charge density is very high at sharp points and edges

Discussion

5123.	Find the electric field at a given point ‘O’ due to a semi-circular charged ring having linear charge density λ.
Answer» Find the electric field at a given point ‘O’ due to a semi-circular charged ring having linear charge density $λ$ .

5123.

Find the electric field at a given point ‘O’ due to a semi-circular charged ring having linear charge density λ.

Answer»

Find the electric field at a given point ‘O’ due to a semi-circular charged ring having linear charge density $λ$ .

Discussion

5124.	For a real object, which of the following is true corresponding to the image formed by a concave mirror?
Answer» For a real object, which of the following is true corresponding to the image formed by a concave mirror?

Discussion

5125.	Which of the following cannot be charged by friction, if held in hand?
Answer» Which of the following cannot be charged by friction, if held in hand?

Discussion

5126.	When a glass rod is rubbed with a silk cloth, they become ___
Answer» When a glass rod is rubbed with a silk cloth, they become ___

Discussion

5127.	What is qualititive and quantitive inheritance?
Answer» What is qualititive and quantitive inheritance?

Discussion

5128.	Which of these does not conduct electricity?(a) pure water(b) salt solution(c) lime juice(d) lead of pencil
Answer» Which of these does not conduct electricity? (a) pure water (b) salt solution (c) lime juice (d) lead of pencil

Discussion

5129.	In the figure given below, a coil is placed between two permanent magnets and it is rotated with the help of an axle, on which two rings R1 and R2 are internally attached. B1 and B2 represents metallic brushes. G represents galvanometer.The current flowing through the circuit reverses direction periodically, such a current is called alternating current. The current can be made direct by ___.
Answer» In the figure given below, a coil is placed between two permanent magnets and it is rotated with the help of an axle, on which two rings R1 and R2 are internally attached. B1 and B2 represents metallic brushes. G represents galvanometer. The current flowing through the circuit reverses direction periodically, such a current is called alternating current. The current can be made direct by ___.

5129.

In the figure given below, a coil is placed between two permanent magnets and it is rotated with the help of an axle, on which two rings R1 and R2 are internally attached. B1 and B2 represents metallic brushes. G represents galvanometer.The current flowing through the circuit reverses direction periodically, such a current is called alternating current. The current can be made direct by ___.

Answer»

In the figure given below, a coil is placed between two permanent magnets and it is rotated with the help of an axle, on which two rings R1 and R2 are internally attached. B1 and B2 represents metallic brushes. G represents galvanometer.

The current flowing through the circuit reverses direction periodically, such a current is called alternating current. The current can be made direct by ___.

Discussion

5130.	What is the work done by the Porter carrying suitcase on his head ?And why ?
Answer» What is the work done by the Porter carrying suitcase on his head ?And why ?

Discussion

5131.	Choose the correct option: Statement 1: Sound cannot travel in vacuum. Statement 2: Sound is a mechanical wave and propagates as an oscillation of particles through the medium. So they cannot travel in vacuum.
Answer» Choose the correct option: Statement 1: Sound cannot travel in vacuum. Statement 2: Sound is a mechanical wave and propagates as an oscillation of particles through the medium. So they cannot travel in vacuum.

5131.

Choose the correct option: Statement 1: Sound cannot travel in vacuum. Statement 2: Sound is a mechanical wave and propagates as an oscillation of particles through the medium. So they cannot travel in vacuum.

Answer»

Choose the correct option:

Statement 1: Sound cannot travel in vacuum.
Statement 2: Sound is a mechanical wave and propagates as an oscillation of particles through the medium. So they cannot travel in vacuum.

Discussion

5132.	Cobalt, nickel and _______ are magnetic materials.
Answer» Cobalt, nickel and _______ are magnetic materials.

5132.

Cobalt, nickel and _______ are magnetic materials.

Answer»

Cobalt, nickel and _______ are magnetic materials.

Discussion

5133.	Given four bodies with each mass is 100 kg. Which block is applying least amount of pressure on the ground.
Answer» Given four bodies with each mass is 100 kg. Which block is applying least amount of pressure on the ground.

5133.

Given four bodies with each mass is 100 kg. Which block is applying least amount of pressure on the ground.

Answer»

Given four bodies with each mass is 100 kg. Which block is applying least amount of pressure on the ground.

Discussion

5134.	A 50 N force is applied on an area of 2 m2. Compute the pressure.
Answer» A $50 N$ force is applied on an area of $2 m^{2}$ . Compute the pressure.

Discussion

5135.	A block of iron sinks in fluid A but floats in another liquid B, this is because:
Answer» A block of iron sinks in fluid A but floats in another liquid B, this is because:

Discussion

5136.	Explain the terms melting and melting point.
Answer» Explain the terms melting and melting point.

Discussion

5137.	100.Why is metallic coil rotated when it is kept in a magnetic field and current is passed through it?
Answer» 100.Why is metallic coil rotated when it is kept in a magnetic field and current is passed through it?

Discussion

5138.	How to prove BPT theorem?
Answer» How to prove BPT theorem?

Discussion

5139.	Describe the effect of force acting upon an object when force of gravity is greater than air resistance .
Answer» Describe the effect of force acting upon an object when force of gravity is greater than air resistance .

5139.

Describe the effect of force acting upon an object when force of gravity is greater than air resistance .

Answer»

Describe the effect of force acting upon an object when

force of gravity is greater than air resistance .

Discussion

5140.	A piece of metal at 20oC has a mass of 60g. When it is immersed in a current of steam at 100∘C, 0.5g of steam is condensed on it. Determine the specific heat of metal, given that the latent heat of steam = 540 cal/g.
Answer» A piece of metal at 20^oC has a mass of 60g. When it is immersed in a current of steam at 100^∘C, 0.5g of steam is condensed on it. Determine the specific heat of metal, given that the latent heat of steam = 540 cal/g.

Discussion

5141.	What are the property of friction?
Answer» What are the property of friction?

Discussion

5142.	What is a Echo \vert What are its uses
Answer» What is a Echo \vert What are its uses

Discussion

5143.	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

5144.	why cant we or any other objecct travel at the speed of light
Answer» why cant we or any other objecct travel at the speed of light

Discussion

5145.	Akash noticed that someone had carelessly thrown a banana peel on the footpath. He thought, "If someone steps on the banana peel, he or she is likely to slip and fall." So he picked it up and threw it in dustbin.1. Is Akash right in thinking that people can slip on a banana peel? Why?2. Which two values did Akash show?
Answer» Akash noticed that someone had carelessly thrown a banana peel on the footpath. He thought, "If someone steps on the banana peel, he or she is likely to slip and fall." So he picked it up and threw it in dustbin. 1. Is Akash right in thinking that people can slip on a banana peel? Why? 2. Which two values did Akash show?

Discussion

5146.	In which season of the year are the following constellations visible in the night sky ? (a) Cassiopeia (b) Leo Major
Answer» In which season of the year are the following constellations visible in the night sky ? (a) Cassiopeia (b) Leo Major

5146.

In which season of the year are the following constellations visible in the night sky ? (a) Cassiopeia (b) Leo Major

Answer»

In which season of the year are the following constellations visible in the night sky ?

(a) Cassiopeia

(b) Leo Major

Discussion

5147.	15. Attraction force of any particle is depends on what? Mass/Charge?
Answer» 15. Attraction force of any particle is depends on what? Mass/Charge?

Discussion

5148.	An electrical power line, having a total resistance of 2 Ω , delivers 1 kW at 220 V. The efficiency of the transmission line is approximately
Answer» An electrical power line, having a total resistance of $2 Ω$ , delivers $1 kW$ at $220 V$ . The efficiency of the transmission line is approximately

Discussion

5149.	The number of different sounds in which a peacock can scream is ________.
Answer» The number of different sounds in which a peacock can scream is ________.

Discussion

5150.	The peak (crest) on the graph of a sound wave represents the region of:
Answer» The peak (crest) on the graph of a sound wave represents the region of:

Discussion

Explore topic-wise InterviewSolutions in .

Choose the correct alternative in the following question:If 2n=1024, then 2n2+2=a 64 b 128 c 256 d 512

In an intrinsic semiconductor , the density of conduction electrons is 7.07*10^15 m^-3 . When it is doped with indium , the density of holes becomes 5*10^22 m^-3. find the density of conduction electrons in doped semiconductor

A body of 10 kg is kept on a rough horizontal surface which can offer maximum frictional force or 40 N what will be the frictional force when applied force is 20 N​?

The kinetic energy of a particle depends on the square of speed of particle . If error in measurement of speed is 30%,the error in measurement of kinetic energy will be---?? 1\} 30% 2\} 60% 3\} 69% 4\} 15%

A particle is at rest at t=0. If the acceleration of the particle is given as a=sinπt+cosπt, in SI units, then the maximum speed of the particle is

58.What is lazer beam of light and it is useful

The change in speed (Q. 1) causes a change in the direction of the light ray. What change is observed when light goes from: a. air to water b. water to air?

104. A non conducting square plate of side length 2a is uniformly charged with Q and a point charge q is placed at perpendicular distance a as shown in figure. The electric force on the point charge due to plate is

When H+ ion moves from high concentration to low concentration in f0f1 particles why there is a release of energy?

How the friction creat heat?

The mass of the planet Mars is 6 × 1023 kg and radius is 4.3 × 106 m. Calculate the weight of a man on Mars whose weight on earth is 600 N. (Given g on earth = 10 msec2)

Which of the following consequences are the effects of atmospheric pressure?

The angle between the overlapping of one s orbital and one p orbital at the internuclear axis is1)1202)120degree28'3)180 4)109degree28'

Name the physical state of matter that can be easily compressed and justify your answer.

Sound is a form of energy. Substantiate this statement with example. (5marks)

two celestial are separated by some dis†an ce .if the mass of any one of the point like bodies is double while the mass of other is halved then how far should they be taken so that the gravitational force between them become one fourth

Question 7What is the minimum resistance which can be made using five resistors each of 15Ω?(a) 15Ω(b) 125Ω(c) 110Ω(d) 25Ω

An engine can pull 4 coaches at a maximum speed of 20m/s. mass of enngine is twice that of every coach. assume resistive forces to be proportional to the weight. calculate maximum speeds of engines when it pulls 12 and 6 coaches respectively.

A ray of light going from an optically rarer medium to an optically denser medium

Surface charge density is inversely proportional to radius of curvature of conductor. What radius of curvature we would take for sharp points and edges? How surface charge density is very high at sharp points and edges

Find the electric field at a given point ‘O’ due to a semi-circular charged ring having linear charge density λ.

For a real object, which of the following is true corresponding to the image formed by a concave mirror?

Which of the following cannot be charged by friction, if held in hand?

When a glass rod is rubbed with a silk cloth, they become ___

What is qualititive and quantitive inheritance?

Which of these does not conduct electricity?(a) pure water(b) salt solution(c) lime juice(d) lead of pencil

What is the work done by the Porter carrying suitcase on his head ?And why ?

Choose the correct option: Statement 1: Sound cannot travel in vacuum. Statement 2: Sound is a mechanical wave and propagates as an oscillation of particles through the medium. So they cannot travel in vacuum.

Cobalt, nickel and _______ are magnetic materials.

Given four bodies with each mass is 100 kg. Which block is applying least amount of pressure on the ground.

A 50 N force is applied on an area of 2 m2. Compute the pressure.

A block of iron sinks in fluid A but floats in another liquid B, this is because:

Explain the terms melting and melting point.

100.Why is metallic coil rotated when it is kept in a magnetic field and current is passed through it?

How to prove BPT theorem?

Describe the effect of force acting upon an object when force of gravity is greater than air resistance .

A piece of metal at 20oC has a mass of 60g. When it is immersed in a current of steam at 100∘C, 0.5g of steam is condensed on it. Determine the specific heat of metal, given that the latent heat of steam = 540 cal/g.

What are the property of friction?

What is a Echo \vert What are its uses

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

why cant we or any other objecct travel at the speed of light

In which season of the year are the following constellations visible in the night sky ? (a) Cassiopeia (b) Leo Major

15. Attraction force of any particle is depends on what? Mass/Charge?

An electrical power line, having a total resistance of 2 Ω , delivers 1 kW at 220 V. The efficiency of the transmission line is approximately

The number of different sounds in which a peacock can scream is ________.

The peak (crest) on the graph of a sound wave represents the region of:

In an intrinsic semiconductor , the density of conduction electrons is 7.0710^15 m^-3 . When it is doped with indium , the density of holes becomes 510^22 m^-3. find the density of conduction electrons in doped semiconductor

A body of 10 kg is kept on a rough horizontal surface which can offer maximum frictional force or 40 N what will be the frictional force when applied force is 20 N?