13232 + Interview Questions in Physics Page 101 InterviewSolution

5001.	45. If a ball is thrown vertically upwards with speed u, the distance covered during the last t seconds of its ascent is
Answer» 45. If a ball is thrown vertically upwards with speed u, the distance covered during the last t seconds of its ascent is

Discussion

5002.	The electrical resistance of a cell of 0.05 M NaOH solution in which electric plates are 1 cm apart with cross-sectional area of 50 cm2 is 1.7427 ohm. Calculate the resistivity in ohm-cm units.() 87.135(2) 97.245(3) 76.135(4) 82.35
Answer» The electrical resistance of a cell of 0.05 M NaOH solution in which electric plates are 1 cm apart with cross-sectional area of 50 cm2 is 1.7427 ohm. Calculate the resistivity in ohm-cm units.() 87.135(2) 97.245(3) 76.135(4) 82.35

Discussion

5003.	A dimensionless quantity
Answer» A dimensionless quantity

5003.

A dimensionless quantity

Answer»

A dimensionless quantity

Discussion

5004.	Byjus said that sound is a mechanical wave,longitudinal and transverse wave sometimes. But my teacher said that sound is a form of energy. Who is correct?
Answer» Byjus said that sound is a mechanical wave,longitudinal and transverse wave sometimes. But my teacher said that sound is a form of energy. Who is correct?

Discussion

5005.	If a ball is thrown vertically upwards with speed u, the distance covered during the last t seconds of its ascent is(1.) ut(2.) 1/2gt^2(3.) ut - 1/2gt^2(4.) (u + gt)t
Answer» If a ball is thrown vertically upwards with speed u, the distance covered during the last t seconds of its ascent is (1.) ut (2.) 1/2gt^2 (3.) ut - 1/2gt^2 (4.) (u + gt)t

Discussion

5006.	The energy of light having wavelength 19.89 A is
Answer» The energy of light having wavelength 19.89 A is

Discussion

5007.	If the Earth is at 14th of the present distance from the Sun, then the duration of a year on the Earth would have been ____ of the present duration of a year.
Answer» If the Earth is at $\frac{1}{4} t h$ of the present distance from the Sun, then the duration of a year on the Earth would have been ____ of the present duration of a year.

Discussion

5008.	A light mass and a heavy mass have equal momentum.Which will have more kinetic energy?
Answer» A light mass and a heavy mass have equal momentum.Which will have more kinetic energy?

Discussion

5009.	Two sound sources each emitting sound of wavelength λ are fixed some dis†an ce apart. A listener moves with a velocity u along the line joiining the two sources . The number of beats heard by him per second is how much
Answer» Two sound sources each emitting sound of wavelength λ are fixed some dis†an ce apart. A listener moves with a velocity u along the line joiining the two sources . The number of beats heard by him per second is how much

Discussion

5010.	What are longitudinal waves and transverse waves? Explain with the help of labelled diagrams.
Answer» What are longitudinal waves and transverse waves? Explain with the help of labelled diagrams.

Discussion

5011.	Find the minimum energy required to launch A satellite of mass m from the surface of earth of mass M and radius R in A circular orbit at altitude 2R. Why in the final energy we are taking total energy On what basis do we use it
Answer» Find the minimum energy required to launch A satellite of mass m from the surface of earth of mass M and radius R in A circular orbit at altitude 2R. Why in the final energy we are taking total energy On what basis do we use it

Discussion

5012.	when velocity is cons†an t why acceleration is 0?
Answer» when velocity is cons†an t why acceleration is 0?

Discussion

5013.	Manu is archery trainer.While teaching his students he asks them to keep the arrow a little above the target.Sonu is very curious to know the reason behind this and asks him. Manu explains very patiently to Song on how the arrow travels when released.What explanation does Manu give to Sonu?
Answer» Manu is archery trainer.While teaching his students he asks them to keep the arrow a little above the target.Sonu is very curious to know the reason behind this and asks him. Manu explains very patiently to Song on how the arrow travels when released.What explanation does Manu give to Sonu?

Discussion

5014.	Question 23Which is the process used to harness nuclear energy these days? Explain it briefly.
Answer» Question 23 Which is the process used to harness nuclear energy these days? Explain it briefly.

Discussion

5015.	What is the value of acceleration due to gravity of the Earth? (Given mass of the Earth is 6×1024 kg and radius of the Earth is 6.4× 106 m).
Answer» What is the value of acceleration due to gravity of the Earth? (Given mass of the Earth is $6 \times 10^{24} k g$ and radius of the Earth is $6.4 \times$ $10^{6} m$ ).

Discussion

5016.	A particle P moves in a counter clock wise direction on a circular path as shown in fig. The movement of P is such that it sweeps out a length S = t^{3 }+5 where S is in metres and t is in seconds. The radius of the path is 20 m. The acceleration of P when t = 2 s is nearly:
Answer» A particle P moves in a counter clock wise direction on a circular path as shown in fig. The movement of P is such that it sweeps out a length S = t^{3 }+5 where S is in metres and t is in seconds. The radius of the path is 20 m. The acceleration of P when t = 2 s is nearly:

Discussion

5017.	A conductor carries a current of 0.5 A. How much charge would pass through a cross-section of the conductor in 20 s?
Answer» A conductor carries a current of $0.5 A$ . How much charge would pass through a cross-section of the conductor in $20 s$ ?

Discussion

5018.	Which of the following distance-time graphs shows a truck moving with speed which is not constant?
Answer» Which of the following distance-time graphs shows a truck moving with speed which is not constant?

Discussion

5019.	1f the time and displacement of particle along the positive(x2-1)2, then find the accelerationX-axis are related as tin terms of x
Answer» 1f the time and displacement of particle along the positive(x2-1)2, then find the accelerationX-axis are related as tin terms of x

Discussion

5020.	Momentum is calculated as:m: Massv: Velocity
Answer» Momentum is calculated as: m: Mass v: Velocity

Discussion

5021.	The figure shows the voltage drops across the resistances. Find V1.
Answer» The figure shows the voltage drops across the resistances. Find $V_{1}$ .

Discussion

5022.	State two ways to save the energy.
Answer» State two ways to save the energy.

Discussion

5023.	If velocity v as a function of time t is given as v = 3t2 then position x is proportional to
Answer» If velocity v as a function of time t is given as v = 3t2 then position x is proportional to

Discussion

5024.	The scale of an ammeter is shown below:The least count of this ammeter is :(1) 0.05 A(2) 0.5 A(3) 0.1 A(4) 1 A
Answer» The scale of an ammeter is shown below: The least count of this ammeter is : (1) 0.05 A (2) 0.5 A (3) 0.1 A (4) 1 A

Discussion

5025.	A particle of mass m is fixed to one end of a light rigid rod of length l and rotated in a verticle circular path about its other end. The minimum speed of the particle at its highest point must be- (a)zero (b) \sqrt{gl} (c) \sqrt{1.5gl} (d)\sqrt{2gl
Answer» A particle of mass m is fixed to one end of a light rigid rod of length l and rotated in a verticle circular path about its other end. The minimum speed of the particle at its highest point must be- (a)zero (b) \sqrt{gl} (c) \sqrt{1.5gl} (d)\sqrt{2gl

Discussion

5026.	ram goes for a morning walk in a circular park of diameter. he completes one revolution of the park in 4 mins.find his velocity and speed after 22 mins
Answer» ram goes for a morning walk in a circular park of diameter. he completes one revolution of the park in 4 mins.find his velocity and speed after 22 mins

Discussion

5027.	a solid sphere of mass m and radius r rolls on a rough horizontal plane with speed u. now it rolls up on a smooth inclined plane of inclination 30^° . The length of inclined plane travelled by sphere is-1)u^2/g, 2)u^2/2g
Answer» a solid sphere of mass m and radius r rolls on a rough horizontal plane with speed u. now it rolls up on a smooth inclined plane of inclination 30^° . The length of inclined plane travelled by sphere is-1)u^2/g, 2)u^2/2g

Discussion

5028.	A block of mass M has a circular cut with a frictionless surface as shown. The block rests on the horizontal frictionless surfaced of a fixed table. Initially the right edge of the block is at x = 0, in a coordinate system fixed to the table. A point mass m is released from rest at the topmost point of the path as shown and it slides down. When the mass loses contact with the block, its position is x and the velocity is v. At that instant, which of the following option is/are correct ?
Answer» A block of mass M has a circular cut with a frictionless surface as shown. The block rests on the horizontal frictionless surfaced of a fixed table. Initially the right edge of the block is at x = 0, in a coordinate system fixed to the table. A point mass m is released from rest at the topmost point of the path as shown and it slides down. When the mass loses contact with the block, its position is x and the velocity is v. At that instant, which of the following option is/are correct ?

5028.

A block of mass M has a circular cut with a frictionless surface as shown. The block rests on the horizontal frictionless surfaced of a fixed table. Initially the right edge of the block is at x = 0, in a coordinate system fixed to the table. A point mass m is released from rest at the topmost point of the path as shown and it slides down. When the mass loses contact with the block, its position is x and the velocity is v. At that instant, which of the following option is/are correct ?

Answer»

A block of mass M has a circular cut with a frictionless surface as shown. The block rests on the horizontal frictionless surfaced of a fixed table. Initially the right edge of the block is at x = 0, in a coordinate system fixed to the table. A point mass m is released from rest at the topmost point of the path as shown and it slides down. When the mass loses contact with the block, its position is x and the velocity is v. At that instant, which of the following option is/are correct ?

Discussion

5029.	0A passenger arriving in a new town wishes to go from the station to a hotel located 10 km away on a straightroad from the station. A dishonest cabman takes him along a circuitous path 23 km long and reaches thehotel in 28 min. What is(a) The average speed of the taxi(b) the magnitude of average velocity? Are the two equal?
Answer» 0A passenger arriving in a new town wishes to go from the station to a hotel located 10 km away on a straightroad from the station. A dishonest cabman takes him along a circuitous path 23 km long and reaches thehotel in 28 min. What is(a) The average speed of the taxi(b) the magnitude of average velocity? Are the two equal?

Discussion

5030.	66. How gravitational force act on the tides of the sea?
Answer» 66. How gravitational force act on the tides of the sea?

Discussion

5031.	The first law of thermodynamics is a statement of
Answer» The first law of thermodynamics is a statement of

Discussion

5032.	Question 1 An echo returned in 3 s. What is the distance of the reflecting surface from the source, given that the speed of sound is 342ms−1?
Answer» Question 1 An echo returned in 3 s. What is the distance of the reflecting surface from the source, given that the speed of sound is $342 m s^{- 1}$ ?

Discussion

5033.	State biot-savarts law in vector form . express the magnetic field due to an elemental carrying current I at a distance r from the element
Answer» State biot-savarts law in vector form . express the magnetic field due to an elemental carrying current I at a distance r from the element

Discussion

5034.	A glass flask having mass 390 g and an interior volume of 500 cm3 floats completely inside water, when it is half filled with water. The density of the material of the flask is
Answer» A glass flask having mass $390 g$ and an interior volume of $500 {cm}^{3}$ floats completely inside water, when it is half filled with water. The density of the material of the flask is

Discussion

5035.	Energy enters in a food chain through : (a) primary consumers (b) secondary consumers (c) tertiary consumers (d) producers.
Answer» Energy enters in a food chain through : (a) primary consumers (b) secondary consumers (c) tertiary consumers (d) producers.

5035.

Energy enters in a food chain through : (a) primary consumers (b) secondary consumers (c) tertiary consumers (d) producers.

Answer»

Energy enters in a food chain through :

(a) primary consumers

(b) secondary consumers

(c) tertiary consumers

(d) producers.

Discussion

5036.	In a drained triaxial compression test, a sample of sand fails at deviator stress of 150 kPa under confining pressure of 50 kPa. The angle of internal friction (in degree, round off to the nearest integer) of the sample, is .36.87
Answer» In a drained triaxial compression test, a sample of sand fails at deviator stress of 150 kPa under confining pressure of 50 kPa. The angle of internal friction (in degree, round off to the nearest integer) of the sample, is . 36.87

Discussion

5037.	22.4 litre of water vapour at NTP,When condensed to water occupies an approximate volume of- 1. 18L 2. 1L 3. 1mL 4. 18m
Answer» 22.4 litre of water vapour at NTP,When condensed to water occupies an approximate volume of- 1. 18L 2. 1L 3. 1mL 4. 18m

Discussion

5038.	Which of the following graphs represent uniform motion?
Answer» Which of the following graphs represent uniform motion?

Discussion

5039.	A beaker containing full of water is placed on the platform of a spring balance. The balance reads 1.5 kg. A stone of mass 0.5 kg and density 104 kg/m3 is immersed in water without touching the walls of the beaker. What will be the final balance reading ?
Answer» A beaker containing full of water is placed on the platform of a spring balance. The balance reads $1.5 kg$ . A stone of mass $0.5 kg$ and density $10^{4} {kg/m}^{3}$ is immersed in water without touching the walls of the beaker. What will be the final balance reading ?

Discussion

5040.	The position of an object moving along x−axis is given by x=a+bt2, where a=8.5 m and b=2.5 ms–2 and t is measured in seconds. What is average velocity between t=2 s and t=4 s?
Answer» The position of an object moving along $x -$ axis is given by $x = a + b t^{2}$ , where $a = 8.5 m$ and $b = 2.5 {ms}^{- 2}$ and $t$ is measured in seconds. What is average velocity between $t = 2 s$ and $t = 4 s$ ?

Discussion

5041.	Find the velocity of image (in m/s), when the motion of the object and the mirror are as shown in the figure below.
Answer» Find the velocity of image $(in m / s)$ , when the motion of the object and the mirror are as shown in the figure below.

Discussion

5042.	A capacitor of 5nF is given a charge 10mC. What is the amount of work done in moving the charge from negative plate to positive plate
Answer» A capacitor of 5nF is given a charge 10mC. What is the amount of work done in moving the charge from negative plate to positive plate

Discussion

5043.	In a radioactive decay chain, 23290Th nucleus decays to 21282Pb nucleus. Let Nα and Nβ be the number of α and β− particles respectively, emitted in this decay process. Which of the following statements is (are) true?
Answer» In a radioactive decay chain, $_{90}^{232} T h$ nucleus decays to $_{82}^{212} P b$ nucleus. Let $N_{α}$ and $N_{β}$ be the number of $α$ and $β^{-}$ particles respectively, emitted in this decay process. Which of the following statements is (are) true?

Discussion

5044.	The wavelength of sound waves in hydrogen gas corresponding to the lower limt or audiin hydrogen gas is about 1350 m/s)bility is (speed of sound
Answer» The wavelength of sound waves in hydrogen gas corresponding to the lower limt or audiin hydrogen gas is about 1350 m/s)bility is (speed of sound

Discussion

5045.	If momentum of an object is increased by 20% then it's kinetic energy will increase by how much.
Answer» If momentum of an object is increased by 20% then it's kinetic energy will increase by how much.

Discussion

5046.	6. A one kg particle strikes a few A one kg particle strikes a wall with velocity onem/s at an angle of 30degree with normal to the wall and reflects at the same angle. If it Remain in contact with wall for 0.1 sec then the force is
Answer» 6. A one kg particle strikes a few A one kg particle strikes a wall with velocity onem/s at an angle of 30degree with normal to the wall and reflects at the same angle. If it Remain in contact with wall for 0.1 sec then the force is

Discussion

5047.	Should the handle and bristles of a tooth brush be made of the same material? Explain your answer.
Answer» Should the handle and bristles of a tooth brush be made of the same material? Explain your answer.

Discussion

5048.	Some examples and explaination of Situation where Newton's all laws are fails?
Answer» Some examples and explaination of Situation where Newton's all laws are fails?

Discussion

5049.	Time taken by the sunlight to pass through a window made of glass of 5 mm thickness is _____s( refractive index of glass = 1.5)
Answer» Time taken by the sunlight to pass through a window made of glass of 5 mm thickness is _____s ( refractive index of glass = 1.5)

Discussion

5050.	Define:(1) Wavelength(2) Frequency(3) Amplitude(4) Echo
Answer» Define: (1) Wavelength (2) Frequency (3) Amplitude (4) Echo

5050.

Define:(1) Wavelength(2) Frequency(3) Amplitude(4) Echo

Answer»

Define:

(1) Wavelength

(2) Frequency

(3) Amplitude

(4) Echo

Discussion

Explore topic-wise InterviewSolutions in .

45. If a ball is thrown vertically upwards with speed u, the distance covered during the last t seconds of its ascent is

The electrical resistance of a cell of 0.05 M NaOH solution in which electric plates are 1 cm apart with cross-sectional area of 50 cm2 is 1.7427 ohm. Calculate the resistivity in ohm-cm units.() 87.135(2) 97.245(3) 76.135(4) 82.35

A dimensionless quantity

Byjus said that sound is a mechanical wave,longitudinal and transverse wave sometimes. But my teacher said that sound is a form of energy. Who is correct?

If a ball is thrown vertically upwards with speed u, the distance covered during the last t seconds of its ascent is(1.) ut(2.) 1/2gt^2(3.) ut - 1/2gt^2(4.) (u + gt)t

The energy of light having wavelength 19.89 A is

If the Earth is at 14th of the present distance from the Sun, then the duration of a year on the Earth would have been ____ of the present duration of a year.

A light mass and a heavy mass have equal momentum.Which will have more kinetic energy?

Two sound sources each emitting sound of wavelength λ are fixed some dis†an ce apart. A listener moves with a velocity u along the line joiining the two sources . The number of beats heard by him per second is how much

What are longitudinal waves and transverse waves? Explain with the help of labelled diagrams.

Find the minimum energy required to launch A satellite of mass m from the surface of earth of mass M and radius R in A circular orbit at altitude 2R. Why in the final energy we are taking total energy On what basis do we use it

when velocity is cons†an t why acceleration is 0?

Manu is archery trainer.While teaching his students he asks them to keep the arrow a little above the target.Sonu is very curious to know the reason behind this and asks him. Manu explains very patiently to Song on how the arrow travels when released.What explanation does Manu give to Sonu?

Question 23Which is the process used to harness nuclear energy these days? Explain it briefly.

What is the value of acceleration due to gravity of the Earth? (Given mass of the Earth is 6×1024 kg and radius of the Earth is 6.4× 106 m).

A particle P moves in a counter clock wise direction on a circular path as shown in fig. The movement of P is such that it sweeps out a length S = t^{3 }+5 where S is in metres and t is in seconds. The radius of the path is 20 m. The acceleration of P when t = 2 s is nearly:

A conductor carries a current of 0.5 A. How much charge would pass through a cross-section of the conductor in 20 s?

Which of the following distance-time graphs shows a truck moving with speed which is not constant?

1f the time and displacement of particle along the positive(x2-1)2, then find the accelerationX-axis are related as tin terms of x

Momentum is calculated as:m: Massv: Velocity

The figure shows the voltage drops across the resistances. Find V1.

State two ways to save the energy.

If velocity v as a function of time t is given as v = 3t2 then position x is proportional to

The scale of an ammeter is shown below:The least count of this ammeter is :(1) 0.05 A(2) 0.5 A(3) 0.1 A(4) 1 A

A particle of mass m is fixed to one end of a light rigid rod of length l and rotated in a verticle circular path about its other end. The minimum speed of the particle at its highest point must be- (a)zero (b) \sqrt{gl} (c) \sqrt{1.5gl} (d)\sqrt{2gl

ram goes for a morning walk in a circular park of diameter. he completes one revolution of the park in 4 mins.find his velocity and speed after 22 mins

a solid sphere of mass m and radius r rolls on a rough horizontal plane with speed u. now it rolls up on a smooth inclined plane of inclination 30^° . The length of inclined plane travelled by sphere is-1)u^2/g, 2)u^2/2g

66. How gravitational force act on the tides of the sea?

The first law of thermodynamics is a statement of

Question 1 An echo returned in 3 s. What is the distance of the reflecting surface from the source, given that the speed of sound is 342ms−1?

State biot-savarts law in vector form . express the magnetic field due to an elemental carrying current I at a distance r from the element

A glass flask having mass 390 g and an interior volume of 500 cm3 floats completely inside water, when it is half filled with water. The density of the material of the flask is

Energy enters in a food chain through : (a) primary consumers (b) secondary consumers (c) tertiary consumers (d) producers.

In a drained triaxial compression test, a sample of sand fails at deviator stress of 150 kPa under confining pressure of 50 kPa. The angle of internal friction (in degree, round off to the nearest integer) of the sample, is .36.87

22.4 litre of water vapour at NTP,When condensed to water occupies an approximate volume of- 1. 18L 2. 1L 3. 1mL 4. 18m

Which of the following graphs represent uniform motion?

A beaker containing full of water is placed on the platform of a spring balance. The balance reads 1.5 kg. A stone of mass 0.5 kg and density 104 kg/m3 is immersed in water without touching the walls of the beaker. What will be the final balance reading ?

The position of an object moving along x−axis is given by x=a+bt2, where a=8.5 m and b=2.5 ms–2 and t is measured in seconds. What is average velocity between t=2 s and t=4 s?

Find the velocity of image (in m/s), when the motion of the object and the mirror are as shown in the figure below.

A capacitor of 5nF is given a charge 10mC. What is the amount of work done in moving the charge from negative plate to positive plate

In a radioactive decay chain, 23290Th nucleus decays to 21282Pb nucleus. Let Nα and Nβ be the number of α and β− particles respectively, emitted in this decay process. Which of the following statements is (are) true?

The wavelength of sound waves in hydrogen gas corresponding to the lower limt or audiin hydrogen gas is about 1350 m/s)bility is (speed of sound

If momentum of an object is increased by 20% then it's kinetic energy will increase by how much.

6. A one kg particle strikes a few A one kg particle strikes a wall with velocity onem/s at an angle of 30degree with normal to the wall and reflects at the same angle. If it Remain in contact with wall for 0.1 sec then the force is

Should the handle and bristles of a tooth brush be made of the same material? Explain your answer.

Some examples and explaination of Situation where Newton's all laws are fails?

Time taken by the sunlight to pass through a window made of glass of 5 mm thickness is _____s( refractive index of glass = 1.5)

Define:(1) Wavelength(2) Frequency(3) Amplitude(4) Echo