9478 + Interview Questions in Physics Page 104 InterviewSolution

5151.	78. Which rule is used to find North-South polarities of an electromagnet?
Answer» 78. Which rule is used to find North-South polarities of an electromagnet?

Discussion

5152.	A vessel contains a non linear triatomic gas. If 50 percent of gas dissociated into individual atom then find the new degree of freedom by ignoring vibration mode and any further dissociation
Answer» A vessel contains a non linear triatomic gas. If 50 percent of gas dissociated into individual atom then find the new degree of freedom by ignoring vibration mode and any further dissociation

Discussion

5153.	How is the bouyant force related to the density of liquid
Answer» How is the bouyant force related to the density of liquid

Discussion

5154.	why does pressure change do not change the sound of an ideal gas
Answer» why does pressure change do not change the sound of an ideal gas

Discussion

5155.	If f(x)=a^x/(a^x+a-1/2) then prove that f(x)+f(1-x)=1
Answer» If f(x)=a^x/(a^x+a-1/2) then prove that f(x)+f(1-x)=1

Discussion

5156.	The town hall building is situated close to Nikhil’s house. There is a clock on the top of the town hall building which rings the bell every hour. Nikhil has noticed that the sound of the clock appears to be much clearer at night. Explain.
Answer» The town hall building is situated close to Nikhil’s house. There is a clock on the top of the town hall building which rings the bell every hour. Nikhil has noticed that the sound of the clock appears to be much clearer at night. Explain.

Discussion

5157.	one solid sphere , having mass 1kg and diameter 0.3m is suspended from wire . If the twisting couple per unit twist for the wire is 6×10^{-3} Nm/rad ,then the time period of torsional pendulum will be 1).7sec 2)7.7sec 3)77sec 4).07se
Answer» one solid sphere , having mass 1kg and diameter 0.3m is suspended from wire . If the twisting couple per unit twist for the wire is 6×10^{-3} Nm/rad ,then the time period of torsional pendulum will be 1).7sec 2)7.7sec 3)77sec 4).07se

Discussion

5158.	If a pendulum has a time period of 3 seconds then it's frequency is A.3 Hz B. 0.5 Hz C. 3 s D. 0.33 Hz
Answer» If a pendulum has a time period of 3 seconds then it's frequency is A.3 Hz B. 0.5 Hz C. 3 s D. 0.33 Hz

5158.

If a pendulum has a time period of 3 seconds then it's frequency is A.3 Hz B. 0.5 Hz C. 3 s D. 0.33 Hz

Answer»

If a pendulum has a time period of 3 seconds then it's frequency is

A.3 Hz

B. 0.5 Hz

C. 3 s

D. 0.33 Hz

Discussion

5159.	The work done against surface tension in blowing a soap bubble from a radius 10 to 20 cm, if the surface tension of solution is 25x10^-3 N/m
Answer» The work done against surface tension in blowing a soap bubble from a radius 10 to 20 cm, if the surface tension of solution is 25x10^-3 N/m

Discussion

5160.	Which of the following is not a natural phenomenon?
Answer» Which of the following is not a natural phenomenon?

Discussion

5161.	Which of the following has the strongest inter-particle force at the room temperature?
Answer» Which of the following has the strongest inter-particle force at the room temperature?

Discussion

5162.	A particle of mass 107 kg is moving along the positive x direction. Its initial position is x=0 and initial velocity is 1 m/s. The graph representing the power delivered the by force vs distance travelled for the straight line motion of the particle is given below.The velocity of particle at x=10 m is:
Answer» A particle of mass $\frac{10}{7} kg$ is moving along the positive $x$ direction. Its initial position is $x = 0$ and initial velocity is $1 m/s$ . The graph representing the power delivered the by force vs distance travelled for the straight line motion of the particle is given below. The velocity of particle at $x = 10 m$ is:

Discussion

5163.	Look at the following figure and choose the correct statement regarding sound propagation in this case.
Answer» Look at the following figure and choose the correct statement regarding sound propagation in this case.

5163.

Look at the following figure and choose the correct statement regarding sound propagation in this case.

Answer»

Look at the following figure and choose the correct statement regarding sound propagation in this case.

Discussion

5164.	A man is 45m behind the bus when the bus start acceleration from rest with an acceleration of 2.5 metre per second square with what minimum velocity should the man start running to catch the bus?
Answer» A man is 45m behind the bus when the bus start acceleration from rest with an acceleration of 2.5 metre per second square with what minimum velocity should the man start running to catch the bus?

Discussion

5165.	An object moves with a constant velocity of 9.8 m/s, then its acceleration in m/s2 is
Answer» An object moves with a constant velocity of 9.8 m/s, then its acceleration in $m / s^{2}$ is

Discussion

5166.	Of what material is universe made up of
Answer» Of what material is universe made up of

Discussion

5167.	5. A material has Poisson's ratio 0.5. If a uniform rod of it suffers a longitudinal strain of 3*ten to the power minus three , what will be the percentage increase in volume? Also tell 140 GPa is equal to how many Pa ?
Answer» 5. A material has Poisson's ratio 0.5. If a uniform rod of it suffers a longitudinal strain of 3*ten to the power minus three , what will be the percentage increase in volume? Also tell 140 GPa is equal to how many Pa ?

Discussion

5168.	What is a longitudinal wave ?
Answer» What is a longitudinal wave ?

Discussion

5169.	30.How to find the value of (1003)*1/3
Answer» 30.How to find the value of (1003)*1/3

Discussion

5170.	Is it true that charge move from charged to uncharged body?
Answer» Is it true that charge move from charged to uncharged body?

Discussion

5171.	Mention the part of our body which vibrates when we speak and hear.
Answer» Mention the part of our body which vibrates when we speak and hear.

Discussion

5172.	Question 3Explain why some of the leaves may get detached from a tree if we vigorously shake its branch.
Answer» Question 3 Explain why some of the leaves may get detached from a tree if we vigorously shake its branch.

Discussion

5173.	Question 3 (d)Give reasons(d) We can easily move our hand in air but to do the same through a solid block of wood we need a karate expert.
Answer» Question 3 (d) Give reasons (d) We can easily move our hand in air but to do the same through a solid block of wood we need a karate expert.

Discussion

5174.	What is the difference between 1) Pressure , Stress and thrust 2) Bulk stress and Hydraulic Stress?
Answer» What is the difference between 1) Pressure , Stress and thrust 2) Bulk stress and Hydraulic Stress?

Discussion

5175.	Braille is a language different from English and other languages. Do you agree? Give reasons.
Answer» Braille is a language different from English and other languages. Do you agree? Give reasons.

Discussion

5176.	Why do we feel extra cold when snow starts melting?
Answer» Why do we feel extra cold when snow starts melting?

Discussion

5177.	What is the reason for the formation of lightning in a thunderstorm?
Answer» What is the reason for the formation of lightning in a thunderstorm?

Discussion

5178.	How will you use a gold leaf electroscope to find out whether a body is charged or uncharged?
Answer» How will you use a gold leaf electroscope to find out whether a body is charged or uncharged?

Discussion

5179.	Which of the following is a way to reduce friction?
Answer» Which of the following is a way to reduce friction?

Discussion

5180.	A carbon resistor has coloured strips as shown in figure. What is its resistance value with tolerance?
Answer» A carbon resistor has coloured strips as shown in figure. What is its resistance value with tolerance?

Discussion

5181.	The path of a ray of light coming from air passing through a rectangular glass slab traced by four students are shown in figure below. Which one of them is correct?
Answer» The path of a ray of light coming from air passing through a rectangular glass slab traced by four students are shown in figure below. Which one of them is correct?

Discussion

5182.	A body A is projected upwards with a velocity of 98 ms−1. After 4 seconds, a second body B is projected upwards with the same velocity. Both the bodies will meet after
Answer» A body A is projected upwards with a velocity of $98 m s^{- 1}$ . After 4 seconds, a second body B is projected upwards with the same velocity. Both the bodies will meet after

Discussion

5183.	In a laboratory experiment on friction, a block of weight 135 N lying on a rough horizontal table is pulled by a horizontal wire. The pull (P) gradually increases until the block begins to move and continues to increase thereafter. Given figure shows a graph of the friction force (f) on this block as a function of the pull (P)The region of the graph where kinetic friction occur is
Answer» In a laboratory experiment on friction, a block of weight $135 N$ lying on a rough horizontal table is pulled by a horizontal wire. The pull $(P)$ gradually increases until the block begins to move and continues to increase thereafter. Given figure shows a graph of the friction force $(f)$ on this block as a function of the pull $(P)$ The region of the graph where kinetic friction occur is

Discussion

5184.	A bar magnet is broken in half and the two pieces are separated. Which of the following diagrams shows the magnetic field lines from the two pieces?
Answer» A bar magnet is broken in half and the two pieces are separated. Which of the following diagrams shows the magnetic field lines from the two pieces?

Discussion

5185.	statement1: There is a time delay between actual sunrise and apparent sunrise. statement2: Atmospheric refraction is the cause of time delay between actual sunrise and apparent sunrise.
Answer» statement1: There is a time delay between actual sunrise and apparent sunrise. statement2: Atmospheric refraction is the cause of time delay between actual sunrise and apparent sunrise.

5185.

statement1: There is a time delay between actual sunrise and apparent sunrise. statement2: Atmospheric refraction is the cause of time delay between actual sunrise and apparent sunrise.

Answer»

statement1: There is a time delay between actual sunrise and apparent sunrise.

statement2: Atmospheric refraction is the cause of time delay between actual sunrise and apparent sunrise.

Discussion

5186.	In the figure shown below, the angle made by the light ray with the normal in the medium of refractive index √2 will be
Answer» In the figure shown below, the angle made by the light ray with the normal in the medium of refractive index $\sqrt{2}$ will be

Discussion

5187.	a cell of emf E is connected across a resis†an ce r the potential difference between the terminal of the cell is found to be v the internal resis†an ce of the cell
Answer» a cell of emf E is connected across a resis†an ce r the potential difference between the terminal of the cell is found to be v the internal resis†an ce of the cell

Discussion

5188.	Find the pressure in pascal when a thrust of 100 kgf is acting on a surface of area 5 m2.
Answer» Find the pressure in pascal when a thrust of $100 k g f$ is acting on a surface of area $5 m^{2}$ .

Discussion

5189.	A light ray refracted from air to a denser medium. The angle of incidence is 60° and the angle of refraction is 30°. If the speed of light in air is 3×108 m/s, find the speed of light in the denser medium.[2 marks]
Answer» A light ray refracted from air to a denser medium. The angle of incidence is 60° and the angle of refraction is 30°. If the speed of light in air is $3 \times 10^{8} m / s$ , find the speed of light in the denser medium. [2 marks]

Discussion

5190.	{ Q }9/15 The pressure exerted by a water column of }}{ height }100cm is same as that exerted by }50cm} column of an unknown liquid. What is the density of } the liquid?
Answer» { Q }9/15 The pressure exerted by a water column of }}{ height }100cm is same as that exerted by }50cm} column of an unknown liquid. What is the density of } the liquid?

Discussion

5191.	a body projected vertically up from bottom of tower and another body is dropped freely from top of tower then time taken by them to meet.
Answer» a body projected vertically up from bottom of tower and another body is dropped freely from top of tower then time taken by them to meet.

Discussion

5192.	A Kabaddi player is trying to increase his grip. He attempts to rub his hands with one of the following materials. Which one should he choose for a better grip?
Answer» A Kabaddi player is trying to increase his grip. He attempts to rub his hands with one of the following materials. Which one should he choose for a better grip?

Discussion

5193.	Name the force which always opposes the motion.
Answer» Name the force which always opposes the motion.

Discussion

5194.	81.A fish rising vertically at a rate of 3m/s to the surface of water observes a kingfisher ( a bird ) above the water diving vertically towards it at the rate of 9m/s , the refractive index of water is 4/3 . calculate the actual velocity of the kingfisher ?
Answer» 81.A fish rising vertically at a rate of 3m/s to the surface of water observes a kingfisher ( a bird ) above the water diving vertically towards it at the rate of 9m/s , the refractive index of water is 4/3 . calculate the actual velocity of the kingfisher ?

Discussion

5195.	According to Newton's second law of motion, the net force acting on a body is given by
Answer» According to Newton's second law of motion, the net force acting on a body is given by

Discussion

5196.	9. The number of litre of air required to burn 8 litre of ethyne is approximately
Answer» 9. The number of litre of air required to burn 8 litre of ethyne is approximately

Discussion

5197.	Identify the units for volume.
Answer» Identify the units for volume.

Discussion

5198.	State the factors on which moment of force about a point depends
Answer» State the factors on which moment of force about a point depends

Discussion

5199.	Salt particles ____ when added in water and mixed.
Answer» Salt particles ____ when added in water and mixed.

Discussion

5200.	To calculate the force exerted by an object, should we take the mass of the body exerting the force or the body receiving the force ? Why ?
Answer» To calculate the force exerted by an object, should we take the mass of the body exerting the force or the body receiving the force ? Why ?

Discussion

Explore topic-wise InterviewSolutions in .

78. Which rule is used to find North-South polarities of an electromagnet?

A vessel contains a non linear triatomic gas. If 50 percent of gas dissociated into individual atom then find the new degree of freedom by ignoring vibration mode and any further dissociation

How is the bouyant force related to the density of liquid

why does pressure change do not change the sound of an ideal gas

If f(x)=a^x/(a^x+a-1/2) then prove that f(x)+f(1-x)=1

The town hall building is situated close to Nikhil’s house. There is a clock on the top of the town hall building which rings the bell every hour. Nikhil has noticed that the sound of the clock appears to be much clearer at night. Explain.

one solid sphere , having mass 1kg and diameter 0.3m is suspended from wire . If the twisting couple per unit twist for the wire is 6×10^{-3} Nm/rad ,then the time period of torsional pendulum will be 1).7sec 2)7.7sec 3)77sec 4).07se

If a pendulum has a time period of 3 seconds then it's frequency is A.3 Hz B. 0.5 Hz C. 3 s D. 0.33 Hz

The work done against surface tension in blowing a soap bubble from a radius 10 to 20 cm, if the surface tension of solution is 25x10^-3 N/m

Which of the following is not a natural phenomenon?

Which of the following has the strongest inter-particle force at the room temperature?

Look at the following figure and choose the correct statement regarding sound propagation in this case.

A man is 45m behind the bus when the bus start acceleration from rest with an acceleration of 2.5 metre per second square with what minimum velocity should the man start running to catch the bus?

An object moves with a constant velocity of 9.8 m/s, then its acceleration in m/s2 is

Of what material is universe made up of

5. A material has Poisson's ratio 0.5. If a uniform rod of it suffers a longitudinal strain of 3*ten to the power minus three , what will be the percentage increase in volume? Also tell 140 GPa is equal to how many Pa ?

What is a longitudinal wave ?

30.How to find the value of (1003)*1/3

Is it true that charge move from charged to uncharged body?

Mention the part of our body which vibrates when we speak and hear.

Question 3Explain why some of the leaves may get detached from a tree if we vigorously shake its branch.

Question 3 (d)Give reasons(d) We can easily move our hand in air but to do the same through a solid block of wood we need a karate expert.

What is the difference between 1) Pressure , Stress and thrust 2) Bulk stress and Hydraulic Stress?

Braille is a language different from English and other languages. Do you agree? Give reasons.

Why do we feel extra cold when snow starts melting?

What is the reason for the formation of lightning in a thunderstorm?

How will you use a gold leaf electroscope to find out whether a body is charged or uncharged?

Which of the following is a way to reduce friction?

A carbon resistor has coloured strips as shown in figure. What is its resistance value with tolerance?

The path of a ray of light coming from air passing through a rectangular glass slab traced by four students are shown in figure below. Which one of them is correct?

A body A is projected upwards with a velocity of 98 ms−1. After 4 seconds, a second body B is projected upwards with the same velocity. Both the bodies will meet after

A bar magnet is broken in half and the two pieces are separated. Which of the following diagrams shows the magnetic field lines from the two pieces?​

statement1: There is a time delay between actual sunrise and apparent sunrise. statement2: Atmospheric refraction is the cause of time delay between actual sunrise and apparent sunrise.

In the figure shown below, the angle made by the light ray with the normal in the medium of refractive index √2 will be

a cell of emf E is connected across a resis†an ce r the potential difference between the terminal of the cell is found to be v the internal resis†an ce of the cell

Find the pressure in pascal when a thrust of 100 kgf is acting on a surface of area 5 m2.

A light ray refracted from air to a denser medium. The angle of incidence is 60° and the angle of refraction is 30°. If the speed of light in air is 3×108 m/s, find the speed of light in the denser medium.[2 marks]

{ Q }9/15 The pressure exerted by a water column of }}{ height }100cm is same as that exerted by }50cm} column of an unknown liquid. What is the density of } the liquid?

a body projected vertically up from bottom of tower and another body is dropped freely from top of tower then time taken by them to meet.

A Kabaddi player is trying to increase his grip. He attempts to rub his hands with one of the following materials. Which one should he choose for a better grip?

Name the force which always opposes the motion.

81.A fish rising vertically at a rate of 3m/s to the surface of water observes a kingfisher ( a bird ) above the water diving vertically towards it at the rate of 9m/s , the refractive index of water is 4/3 . calculate the actual velocity of the kingfisher ?

According to Newton's second law of motion, the net force acting on a body is given by

9. The number of litre of air required to burn 8 litre of ethyne is approximately

Identify the units for volume.

State the factors on which moment of force about a point depends

Salt particles ____ when added in water and mixed.

To calculate the force exerted by an object, should we take the mass of the body exerting the force or the body receiving the force ? Why ?

A bar magnet is broken in half and the two pieces are separated. Which of the following diagrams shows the magnetic field lines from the two pieces?