3752 + Interview Questions in Physics Page 37 InterviewSolution

1801.	An engine pumps water continuously through a hose.Water leaves the hose with a velocity v and m is the mass per unit length of the water jet. What is therate at which kinetic energy is imparted water?
Answer» An engine pumps water continuously through a hose.Water leaves the hose with a velocity v and m is the mass per unit length of the water jet. What is therate at which kinetic energy is imparted water?

Discussion

1802.	What is the type of sound common to the following pictures?
Answer» What is the type of sound common to the following pictures?

Discussion

1803.	True or False A) A shadow is formed due to the rectilinear propagation of light
Answer» True or False A) A shadow is formed due to the rectilinear propagation of light

1803.

True or False A) A shadow is formed due to the rectilinear propagation of light

Answer»

True or False

A) A shadow is formed due to the rectilinear propagation of light

Discussion

1804.	The average of all solar days in which the earth completes one revolution around the sun is called ______
Answer» The average of all solar days in which the earth completes one revolution around the sun is called ______

Discussion

1805.	If the magnetic dipole moment and susceptibility of an atom of diamagnetic material and paramagnetic materials are denoted by μd, μp and χd, χp respectively, then
Answer» If the magnetic dipole moment and susceptibility of an atom of diamagnetic material and paramagnetic materials are denoted by $μ_{d}, μ_{p}$ and $χ_{d}, χ_{p}$ respectively, then

Discussion

1806.	When we throw a ball upwards, it will eventually come back to us because of ___ force.
Answer» When we throw a ball upwards, it will eventually come back to us because of ___ force.

Discussion

1807.	Does a pinhole camera form an image or a shadow of an object? Justify your answer.
Answer» Does a pinhole camera form an image or a shadow of an object? Justify your answer.

Discussion

1808.	Which of the following is/are property/properties of gas?
Answer» Which of the following is/are property/properties of gas?

Discussion

1809.	Which of the following options shows the correct direction of current flow in a circuit?
Answer» Which of the following options shows the correct direction of current flow in a circuit?

Discussion

1810.	A student covered a torch with red cellophane sheet to obtain red light. Using the red light she obtains a shadow of an opaque object. She repeats this activity with green and blue light. Will the colour of the light affect the shadow? Explain.
Answer» A student covered a torch with red cellophane sheet to obtain red light. Using the red light she obtains a shadow of an opaque object. She repeats this activity with green and blue light. Will the colour of the light affect the shadow? Explain.

Discussion

1811.	Two spherical bodies have radii R, 2R and emissivities e, 2e. If temperature ratio is 2:1, then the thermal power of emission will be in the ratio A. 1:1 B. 2:1 C. 4:1 D. 4:1
Answer» Two spherical bodies have radii R, 2R and emissivities e, 2e. If temperature ratio is 2:1, then the thermal power of emission will be in the ratio A. 1:1 B. 2:1 C. 4:1 D. 4:1

Discussion

1812.	The speed of sound in the air, if the wind is blowing in direction of propagation of sound ___ the speed of sound when the wind is not blowing.
Answer» The speed of sound in the air, if the wind is blowing in direction of propagation of sound ___ the speed of sound when the wind is not blowing.

Discussion

1813.	What is time of ascent and time of descend and drive all of its possible formule with their cases.
Answer» What is time of ascent and time of descend and drive all of its possible formule with their cases.

Discussion

1814.	140.Dimensional formula of magnetic field B is
Answer» 140.Dimensional formula of magnetic field B is

Discussion

1815.	Find the surface area of a circular park having diameter 50m.
Answer» Find the surface area of a circular park having diameter 50m.

Discussion

1816.	There is an elastic ball anda rigid wall. Ball is throwntowards the wall. The work done by the normal reaction exerted by the wall on the ball is -
Answer» There is an elastic ball anda rigid wall. Ball is throwntowards the wall. The work done by the normal reaction exerted by the wall on the ball is -

Discussion

1817.	Q6. Consider the following statements about Transients in Astronomy: 1. They are objects and events occur in the universe which needs to be caught very young and soon after they happen. 2. Gravitational wave events to fall in this category of transients. Gravitational wave events to fall in this category of transients.
Answer» Q6. Consider the following statements about Transients in Astronomy: 1. They are objects and events occur in the universe which needs to be caught very young and soon after they happen. 2. Gravitational wave events to fall in this category of transients. Gravitational wave events to fall in this category of transients.

1817.

Q6. Consider the following statements about Transients in Astronomy: 1. They are objects and events occur in the universe which needs to be caught very young and soon after they happen. 2. Gravitational wave events to fall in this category of transients. Gravitational wave events to fall in this category of transients.

Answer»

Q6. Consider the following statements about Transients in Astronomy:

1. They are objects and events occur in the universe which needs to be caught very young and soon after they happen.

2. Gravitational wave events to fall in this category of transients.

Gravitational wave events to fall in this category of transients.

Discussion

1818.	A: We cannot think of a magnetic field configuration with three poles. R: A bar magnet does exert a torque on itself due to its own field
Answer» A: We cannot think of a magnetic field configuration with three poles. R: A bar magnet does exert a torque on itself due to its own field

Discussion

1819.	A task was assigned to Virat to measure a snake-like steel rod which looks something like this. Which of the following objects/methods should he use to make this measurement?
Answer» A task was assigned to Virat to measure a snake-like steel rod which looks something like this. Which of the following objects/methods should he use to make this measurement?

1819.

A task was assigned to Virat to measure a snake-like steel rod which looks something like this. Which of the following objects/methods should he use to make this measurement?

Answer»

A task was assigned to Virat to measure a snake-like steel rod which looks something like this.

Which of the following objects/methods should he use to make this measurement?

Discussion

1820.	The thickness of a dozen coins on a metre scale was found to be 18 cm. What is the thickness of one coin?
Answer» The thickness of a dozen coins on a metre scale was found to be $18 c m$ . What is the thickness of one coin?

Discussion

1821.	Of the following statements choose the correct combination that helps reduce friction: A) Grease is used to reduce friction in bicycle chain B) Ball bearings are used to reduced friction in a fan C) Oil can be used to increase friction in a car engine D) Talc can be used to reduce friction when an object is sliding on a surface.
Answer» Of the following statements choose the correct combination that helps reduce friction: A) Grease is used to reduce friction in bicycle chain B) Ball bearings are used to reduced friction in a fan C) Oil can be used to increase friction in a car engine D) Talc can be used to reduce friction when an object is sliding on a surface.

Discussion

1822.	A magnet is placed on a paper along the east-west direction. A compass, away from it, constantly points along the north-south direction. The reason is:
Answer» A magnet is placed on a paper along the east-west direction. A compass, away from it, constantly points along the north-south direction. The reason is:

Discussion

1823.	Which of the following statement is TRUE?
Answer» Which of the following statement is TRUE?

Discussion

1824.	The energy required to separate the typical middle mass nucleus 50Sn120 into its constituent nucleons.Mass of 50Sn120 nucleus=119.902199 uMass of proton mp=1.007825 uMass of neutron mn=1.008665 u
Answer» The energy required to separate the typical middle mass nucleus $_{50} {Sn}^{120}$ into its constituent nucleons. Mass of $_{50} {Sn}^{120} nucleus = 119.902199 u$ Mass of proton $m_{p} = 1.007825 u$ Mass of neutron $m_{n} = 1.008665 u$

Discussion

1825.	Rajesh measures the length of a box to be 30 cm using a scale that has a broken left end. The actual length of the box is 29 cm. What is the zero error?1
Answer» Rajesh measures the length of a box to be $30 c m$ using a scale that has a broken left end. The actual length of the box is $29 c m$ . What is the zero error? 1

Discussion

1826.	length of simple pendulum is 25cm and time for 40 ossilation is 50 sec if resolution of stopwatch is 1 sec then accuracy of g in% is
Answer» length of simple pendulum is 25cm and time for 40 ossilation is 50 sec if resolution of stopwatch is 1 sec then accuracy of g in% is

Discussion

1827.	24.A spring with load 5 Kg is stretched by 40 cm. Determine its spring constant.
Answer» 24.A spring with load 5 Kg is stretched by 40 cm. Determine its spring constant.

Discussion

1828.	Astrologers' perceptions are based more on hearsay and conjecture than what they learn from the study of the stars. Comment with reference to the story.
Answer» Astrologers' perceptions are based more on hearsay and conjecture than what they learn from the study of the stars. Comment with reference to the story.

Discussion

1829.	Earth has been assumed or imagined by the scientists as a huge magnetic dipole. Where is the south pole of the imaginary magnet inside the Earth is located ?
Answer» Earth has been assumed or imagined by the scientists as a huge magnetic dipole. Where is the south pole of the imaginary magnet inside the Earth is located ?

Discussion

1830.	A pendulum of length 28cm oscillates such that its string makes an angle of 30^° from the vertical when it is at one of the extreme positions. Find the ratio of the distance to displacement of the bob of the pendulum when it moves from one extreme position to the other.
Answer» A pendulum of length 28cm oscillates such that its string makes an angle of 30^° from the vertical when it is at one of the extreme positions. Find the ratio of the distance to displacement of the bob of the pendulum when it moves from one extreme position to the other.

Discussion

1831.	12. Mr. Verma (50 kg) and Mr. Mathur (60 kg) are sitting at the two extremes of a 4 m long boat (40 kg) s†an ding still in water. To discuss a mechanics problem, they come to the middle of the boat. Neglecting friction with water, how far does the boat move on the water during the process ?
Answer» 12. Mr. Verma (50 kg) and Mr. Mathur (60 kg) are sitting at the two extremes of a 4 m long boat (40 kg) s†an ding still in water. To discuss a mechanics problem, they come to the middle of the boat. Neglecting friction with water, how far does the boat move on the water during the process ?

Discussion

1832.	Provided a metal piece and a thread, what else is necessarily required to find out if the metal piece is a magnet or not?
Answer» Provided a metal piece and a thread, what else is necessarily required to find out if the metal piece is a magnet or not?

Discussion

1833.	What is the function of the filament in the bulb? Explain the mechanism of their working. What other materials can be used to make a filament? [5 MARKS]
Answer» What is the function of the filament in the bulb? Explain the mechanism of their working. What other materials can be used to make a filament? [5 MARKS]

Discussion

1834.	If mo and m are rest mass and moving mass of a body, then its kinetic energy is?
Answer» If mo and m are rest mass and moving mass of a body, then its kinetic energy is?

Discussion

1835.	which of the following is a unit of force
Answer» which of the following is a unit of force

Discussion

1836.	Difference between element and atom.With examples
Answer» Difference between element and atom.With examples

Discussion

1837.

Make two words from one word. One has been done for you. butterfly butter fly everywhere inside outside sunlight

Answer» Make two words from one word. One has been done for you.

butterfly

butter

fly

everywhere	______________	______________
inside	______________	______________
outside	______________	______________
sunlight	______________	______________

Discussion

1838.	A thin bar magnet is cut into two equal parts. The ratio of moment of inertia to the magnetic moment of each part will become(as compared to original magnet) is
Answer» A thin bar magnet is cut into two equal parts. The ratio of moment of inertia to the magnetic moment of each part will become(as compared to original magnet) is

Discussion

1839.	why should switch and fus should be connected to live wire
Answer» why should switch and fus should be connected to live wire

Discussion

1840.	Which of these statements describe the correct properties of friction?A. Rolling friction is always greater than sliding friction.B. Friction acts in the opposite direction of relative motion.C. Friction causes the surfaces in contact to wear away.D. Friction produces heat energy.
Answer» Which of these statements describe the correct properties of friction? A. Rolling friction is always greater than sliding friction. B. Friction acts in the opposite direction of relative motion. C. Friction causes the surfaces in contact to wear away. D. Friction produces heat energy.

1840.

Which of these statements describe the correct properties of friction?A. Rolling friction is always greater than sliding friction.B. Friction acts in the opposite direction of relative motion.C. Friction causes the surfaces in contact to wear away.D. Friction produces heat energy.

Answer»

Which of these statements describe the correct properties of friction?

A. Rolling friction is always greater than sliding friction.

B. Friction acts in the opposite direction of relative motion.

C. Friction causes the surfaces in contact to wear away.

D. Friction produces heat energy.

Discussion

1841.	a student performs experiment with simple pendulum and measures time for 10 vibration. if he measures a time for 100 vibration the relative error in measurement of time period will be reduced by n%.the value of n is _________.
Answer» a student performs experiment with simple pendulum and measures time for 10 vibration. if he measures a time for 100 vibration the relative error in measurement of time period will be reduced by n%.the value of n is _________.

Discussion

1842.	In a system of units, the units of force and energy are 10N and 50J respectively. What is the unit of length in this system?A. 3mB. 5mC. 7mD. 10m
Answer» In a system of units, the units of force and energy are 10N and 50J respectively. What is the unit of length in this system? A. 3m B. 5m C. 7m D. 10m

Discussion

1843.	28.Convert 1 joule work in CGS system.
Answer» 28.Convert 1 joule work in CGS system.

Discussion

1844.	Question 10 (vi)State whether the following statement is ‘True’ or ‘False’The plane in which the earth revolves around the sun is called equatorial plane of earth.
Answer» Question 10 (vi) State whether the following statement is ‘True’ or ‘False’ The plane in which the earth revolves around the sun is called equatorial plane of earth.

Discussion

1845.	define natural magnet
Answer» define natural magnet

Discussion

1846.	A student had a ball, a screen and a torch in working condition. He tried to form a shadow of the ball on the screen by placing them at different positions. Sometimes the shadow was not obtained. Explain.
Answer» A student had a ball, a screen and a torch in working condition. He tried to form a shadow of the ball on the screen by placing them at different positions. Sometimes the shadow was not obtained. Explain.

Discussion

1847.	Write two methods by which a magnet can be demagnetised.
Answer» Write two methods by which a magnet can be demagnetised.

Discussion

1848.	What is Permanent magnet ? Give an example.
Answer» What is Permanent magnet ? Give an example.

Discussion

1849.	Which among the following is an example of class 1 lever?
Answer» Which among the following is an example of class 1 lever?

Discussion

1850.	Convert 7200 seconds to hours.
Answer» Convert 7200 seconds to hours.

Discussion

Explore topic-wise InterviewSolutions in .

An engine pumps water continuously through a hose.Water leaves the hose with a velocity v and m is the mass per unit length of the water jet. What is therate at which kinetic energy is imparted water?

What is the type of sound common to the following pictures?

True or False A) A shadow is formed due to the rectilinear propagation of light

The average of all solar days in which the earth completes one revolution around the sun is called ______

If the magnetic dipole moment and susceptibility of an atom of diamagnetic material and paramagnetic materials are denoted by μd, μp and χd, χp respectively, then

When we throw a ball upwards, it will eventually come back to us because of ___ force.

Does a pinhole camera form an image or a shadow of an object? Justify your answer.

Which of the following is/are property/properties of gas?

Which of the following options shows the correct direction of current flow in a circuit?

A student covered a torch with red cellophane sheet to obtain red light. Using the red light she obtains a shadow of an opaque object. She repeats this activity with green and blue light. Will the colour of the light affect the shadow? Explain.

Two spherical bodies have radii R, 2R and emissivities e, 2e. If temperature ratio is 2:1, then the thermal power of emission will be in the ratio A. 1:1 B. 2:1 C. 4:1 D. 4:1

The speed of sound in the air, if the wind is blowing in direction of propagation of sound ___ the speed of sound when the wind is not blowing.

What is time of ascent and time of descend and drive all of its possible formule with their cases.

140.Dimensional formula of magnetic field B is

Find the surface area of a circular park having diameter 50m.

There is an elastic ball anda rigid wall. Ball is throwntowards the wall. The work done by the normal reaction exerted by the wall on the ball is -

A: We cannot think of a magnetic field configuration with three poles. R: A bar magnet does exert a torque on itself due to its own field

A task was assigned to Virat to measure a snake-like steel rod which looks something like this. Which of the following objects/methods should he use to make this measurement?

The thickness of a dozen coins on a metre scale was found to be 18 cm. What is the thickness of one coin?

A magnet is placed on a paper along the east-west direction. A compass, away from it, constantly points along the north-south direction. The reason is:

Which of the following statement is TRUE?

The energy required to separate the typical middle mass nucleus 50Sn120 into its constituent nucleons.Mass of 50Sn120 nucleus=119.902199 uMass of proton mp=1.007825 uMass of neutron mn=1.008665 u

Rajesh measures the length of a box to be 30 cm using a scale that has a broken left end. The actual length of the box is 29 cm. What is the zero error?1

length of simple pendulum is 25cm and time for 40 ossilation is 50 sec if resolution of stopwatch is 1 sec then accuracy of g in% is

24.A spring with load 5 Kg is stretched by 40 cm. Determine its spring constant.

Astrologers' perceptions are based more on hearsay and conjecture than what they learn from the study of the stars. Comment with reference to the story.

Earth has been assumed or imagined by the scientists as a huge magnetic dipole. Where is the south pole of the imaginary magnet inside the Earth is located ?

A pendulum of length 28cm oscillates such that its string makes an angle of 30^° from the vertical when it is at one of the extreme positions. Find the ratio of the distance to displacement of the bob of the pendulum when it moves from one extreme position to the other.

12. Mr. Verma (50 kg) and Mr. Mathur (60 kg) are sitting at the two extremes of a 4 m long boat (40 kg) s†an ding still in water. To discuss a mechanics problem, they come to the middle of the boat. Neglecting friction with water, how far does the boat move on the water during the process ?

Provided a metal piece and a thread, what else is necessarily required to find out if the metal piece is a magnet or not?

What is the function of the filament in the bulb? Explain the mechanism of their working. What other materials can be used to make a filament? [5 MARKS]

If mo and m are rest mass and moving mass of a body, then its kinetic energy is?

which of the following is a unit of force

Difference between element and atom.With examples

Make two words from one word. One has been done for you. butterfly butter fly everywhere ______________ ______________ inside ______________ ______________ outside ______________ ______________ sunlight ______________ ______________

A thin bar magnet is cut into two equal parts. The ratio of moment of inertia to the magnetic moment of each part will become(as compared to original magnet) is

why should switch and fus should be connected to live wire

Which of these statements describe the correct properties of friction?A. Rolling friction is always greater than sliding friction.B. Friction acts in the opposite direction of relative motion.C. Friction causes the surfaces in contact to wear away.D. Friction produces heat energy.

a student performs experiment with simple pendulum and measures time for 10 vibration. if he measures a time for 100 vibration the relative error in measurement of time period will be reduced by n%.the value of n is _________.

In a system of units, the units of force and energy are 10N and 50J respectively. What is the unit of length in this system?A. 3mB. 5mC. 7mD. 10m

28.Convert 1 joule work in CGS system.

Question 10 (vi)State whether the following statement is ‘True’ or ‘False’The plane in which the earth revolves around the sun is called equatorial plane of earth.

define natural magnet

A student had a ball, a screen and a torch in working condition. He tried to form a shadow of the ball on the screen by placing them at different positions. Sometimes the shadow was not obtained. Explain.

Write two methods by which a magnet can be demagnetised.

What is Permanent magnet ? Give an example.

Which among the following is an example of class 1 lever?

Convert 7200 seconds to hours.

Make two words from one word. One has been done for you. butterfly butter fly everywhere inside outside sunlight