6277 + Interview Questions in Physics Page 27 InterviewSolution

1301.	27.What is RC circuit
Answer» 27.What is RC circuit

Discussion

1302.	Which of the following is/are the modes of heat transfer?
Answer» Which of the following is/are the modes of heat transfer?

Discussion

1303.	What is the boiling point of water at sea level?
Answer» What is the boiling point of water at sea level?

Discussion

1304.	If two people are pulling a box in the same direction with 5 N and 10 N force. Displacement of the box is 18m. Find the net work done.
Answer» If two people are pulling a box in the same direction with 5 N and 10 N force. Displacement of the box is 18m. Find the net work done.

Discussion

1305.	The temperature inside a refrigerator is t2 C andthe room temperature is t C. The amount of heatdelivered to the room for each joule of electricalenergy consumed ideally will be
Answer» The temperature inside a refrigerator is t2 C andthe room temperature is t C. The amount of heatdelivered to the room for each joule of electricalenergy consumed ideally will be

Discussion

1306.	At home you must have seen switch boards. They have buttons. When you press button on the switch board, you see that the bulb, fan or fridge gets on. Through that button, the circuit is attached that helps in switching on and off. The component used for making and breaking a circuit is known as ________
Answer» At home you must have seen switch boards. They have buttons. When you press button on the switch board, you see that the bulb, fan or fridge gets on. Through that button, the circuit is attached that helps in switching on and off. The component used for making and breaking a circuit is known as ________

Discussion

1307.	A solid iron cuboidal block of dimensions 4.4 m × 2.6 m × 1 m is recast into a cylindrical pipe of radius 100 cm. The length of the pipe is:
Answer» A solid iron cuboidal block of dimensions 4.4 m × 2.6 m × 1 m is recast into a cylindrical pipe of radius 100 cm. The length of the pipe is:

Discussion

1308.	40.Four ideal cells of each 10 V are connected as shown in the figure.The current thruogh 2ohm resistor is
Answer» 40.Four ideal cells of each 10 V are connected as shown in the figure.The current thruogh 2ohm resistor is

Discussion

1309.	Concept of heat and work detail
Answer» Concept of heat and work detail

Discussion

1310.	39.On changing the pressure how many types of ice can be formed? How does pressure matters in fomation of ice? Name all the forms of ice? How they are different from one another?
Answer» 39.On changing the pressure how many types of ice can be formed? How does pressure matters in fomation of ice? Name all the forms of ice? How they are different from one another?

Discussion

1311.	Question 13 In the arrangements A and B shown in Figure, pins P and Q are fixed to a metal loop and an iron rod with the help of wax. In which case are both the pins likely to fall at different times? Explain.
Answer» Question 13 In the arrangements A and B shown in Figure, pins P and Q are fixed to a metal loop and an iron rod with the help of wax. In which case are both the pins likely to fall at different times? Explain.

1311.

Question 13 In the arrangements A and B shown in Figure, pins P and Q are fixed to a metal loop and an iron rod with the help of wax. In which case are both the pins likely to fall at different times? Explain.

Answer»

Question 13

In the arrangements A and B shown in Figure, pins P and Q are fixed to a metal loop and an iron rod with the help of wax. In which case are both the pins likely to fall at different times? Explain.

Discussion

1312.	A man can swim in still water at a speed of 3 km/h .He wants to cross a river that flows at 2 km/h and reach the point directly oppositeto his station point.In which direction ( measured w.r.t water current direction ) should he try to swi
Answer» A man can swim in still water at a speed of 3 km/h .He wants to cross a river that flows at 2 km/h and reach the point directly oppositeto his station point.In which direction ( measured w.r.t water current direction ) should he try to swi

Discussion

1313.	The capacitance of a capacitor with dielectric as a medium is 60 μF. When dielectric is removed, its capacitance changes to 12 μF. The permittivity of the dielectric medium is -
Answer» The capacitance of a capacitor with dielectric as a medium is $60 μ F$ . When dielectric is removed, its capacitance changes to $12 μ F$ . The permittivity of the dielectric medium is -

Discussion

1314.	Is there a force of friction between the wheels of a moving train and iron rails? If yes, name the type of friction. If an air cushion can be introduced between the wheel and the rail, what effect will it have on the friction?
Answer» Is there a force of friction between the wheels of a moving train and iron rails? If yes, name the type of friction. If an air cushion can be introduced between the wheel and the rail, what effect will it have on the friction?

Discussion

1315.	A spherical iron ball is placed on a large block ofdry ice at 0^° C. The ball sinks into the ice until itis half submerged. Density of iron is 7.7 x 103kg/m3. Density of ice is 920 kg/m3. Specific heatcapacity of iron is 504 J/kg - K and latent heat offusion of ice is 336 x 103 J/kg. The initial temperature of iron is(1) 37.64^° C(2) 39.82^° C(3) 42.62^° C(4) 38.64^° C
Answer» A spherical iron ball is placed on a large block ofdry ice at 0^° C. The ball sinks into the ice until itis half submerged. Density of iron is 7.7 x 103kg/m3. Density of ice is 920 kg/m3. Specific heatcapacity of iron is 504 J/kg - K and latent heat offusion of ice is 336 x 103 J/kg. The initial temperature of iron is(1) 37.64^° C(2) 39.82^° C(3) 42.62^° C(4) 38.64^° C

Discussion

1316.	Calculate the pressure at a depth of 50 m below the surface of the sea. The density of seawater is 1024 kg/m3. Take g=10m/s2
Answer» Calculate the pressure at a depth of 50 m below the surface of the sea. The density of seawater is 1024 kg/m³. Take $g = 10 m / s^{2}$

Discussion

1317.	A person can run on ground with a maximum speed of 6m/s.The person stands on the rear end of roof of a train moving with constant velocity.The length of train is 120m. The man begins to run at this maximum a capacity towards the front end, reaches the front end,immediately turns back and run towards the rear end.Find the net displacement of the man with respect to ground by the time he reaches back to rear end.The velocity of train is 10 m/s.
Answer» A person can run on ground with a maximum speed of 6m/s.The person stands on the rear end of roof of a train moving with constant velocity.The length of train is 120m. The man begins to run at this maximum a capacity towards the front end, reaches the front end,immediately turns back and run towards the rear end.Find the net displacement of the man with respect to ground by the time he reaches back to rear end.The velocity of train is 10 m/s.

Discussion

1318.	141.three vectors A, B and C are such that A.B=0 and A.C=0 then the vector parallel to A is
Answer» 141.three vectors A, B and C are such that A.B=0 and A.C=0 then the vector parallel to A is

Discussion

1319.	Sheets, tiles etc fixed on the roofs of buildings rise up when strong wind blow outside. Why does this happen?
Answer» Sheets, tiles etc fixed on the roofs of buildings rise up when strong wind blow outside. Why does this happen?

Discussion

1320.	(a) What are the various precautions to be taken while reading clinical thermometer? (b) Match the following: (i) Land breeze blows during(a) summer(ii) Sea breeze blows during(b) winter(iii) Dark clothes are preferred during(c) day(iv) Light coloured clothes are preferred during(d) night [5 MARKS]
Answer» (a) What are the various precautions to be taken while reading clinical thermometer? (b) Match the following: $\begin{matrix} (i) Land breeze blows during & (a) summer (ii) Sea breeze blows during & (b) winter (iii) Dark clothes are preferred during & (c) day (iv) Light coloured clothes are preferred during & (d) night \end{matrix}$ [5 MARKS]

1320.

(a) What are the various precautions to be taken while reading clinical thermometer? (b) Match the following: (i) Land breeze blows during(a) summer(ii) Sea breeze blows during(b) winter(iii) Dark clothes are preferred during(c) day(iv) Light coloured clothes are preferred during(d) night [5 MARKS]

Answer»

(a) What are the various precautions to be taken while reading clinical thermometer?

(b) Match the following:

$\begin{matrix} (i) Land breeze blows during & (a) summer (ii) Sea breeze blows during & (b) winter (iii) Dark clothes are preferred during & (c) day (iv) Light coloured clothes are preferred during & (d) night \end{matrix}$

[5 MARKS]

Discussion

1321.	a man shot a bullet with a speed of 20m/s which just penetrate a plank of wood. With what speed should he shoot a bullet to pass through 5 simillar planks?
Answer» a man shot a bullet with a speed of 20m/s which just penetrate a plank of wood. With what speed should he shoot a bullet to pass through 5 simillar planks?

Discussion

1322.	Where do we short circuit resis†an ces in solving problems
Answer» Where do we short circuit resis†an ces in solving problems

Discussion

1323.	derive the the formula for the potential energy in the spring for 1.when the spring is stretched 2.when the spring is compressed
Answer» derive the the formula for the potential energy in the spring for 1.when the spring is stretched 2.when the spring is compressed

Discussion

1324.	To what height should an object of mass 2kg be raised so that its potential energy is 980J?
Answer» To what height should an object of mass $2 k g$ be raised so that its potential energy is $980 J$ ?

Discussion

1325.	40.A capacitor of capacitance 2uF is connected in the tank circuit of an oscillator oscillating with a frequency of 1kHz. If the current flowing in the circuit is 2mA, the voltage across the capacitor is : 1) 0.16V 2)0.32V 3)79.5V 4)159V
Answer» 40.A capacitor of capacitance 2uF is connected in the tank circuit of an oscillator oscillating with a frequency of 1kHz. If the current flowing in the circuit is 2mA, the voltage across the capacitor is : 1) 0.16V 2)0.32V 3)79.5V 4)159V

Discussion

1326.	Question 2 (a) Mark T if the statement is true and F if it is false: We can obtain an enlarged and erect image by a convex mirror.
Answer» Question 2 (a) Mark T if the statement is true and F if it is false: We can obtain an enlarged and erect image by a convex mirror.

Discussion

1327.	In an electric iron being used in a household, the plastic insulation of live wire and neutral wire in the connecting cable gets torn. Due to this, naked live wire touches the naked neutral wire directly and the electric fuse of the circuit blows off.(a) What term is used to indicate the touching of naked live wire and neutral wire directly?(b) When the naked wires touch each other directly, what happens to the resistance of the circuit so formed?(c) What happens to the current flowing through the wires under these conditions?(d) Which wire connected to the body of an electric iron protects the person using this electric iron from electric shock?
Answer» In an electric iron being used in a household, the plastic insulation of live wire and neutral wire in the connecting cable gets torn. Due to this, naked live wire touches the naked neutral wire directly and the electric fuse of the circuit blows off. (a) What term is used to indicate the touching of naked live wire and neutral wire directly? (b) When the naked wires touch each other directly, what happens to the resistance of the circuit so formed? (c) What happens to the current flowing through the wires under these conditions? (d) Which wire connected to the body of an electric iron protects the person using this electric iron from electric shock?

Discussion

1328.	Illustrate the law of conservation of energy by discussing the energy changes which occur when we draw a pendulum bob to one side and allow it to oscillate. Why do the bob eventually come to rest? What happens to its energy eventually? Is it a violation of the law of conservation of energy?
Answer» Illustrate the law of conservation of energy by discussing the energy changes which occur when we draw a pendulum bob to one side and allow it to oscillate. Why do the bob eventually come to rest? What happens to its energy eventually? Is it a violation of the law of conservation of energy?

Discussion

1329.	The arrangement shown in the figure measures the velocity V of a gas density1 kg/m3 flowing through a pipe. The acceleration due to gravity is 9.81 m/ s2. If the manometric fluid is water (density 1000 kg/m3) and the velocity V is 20 m/s, the differential head h (in mm) between the two arms of the manometer is____________20.4
Answer» The arrangement shown in the figure measures the velocity V of a gas density 1 kg/ $m^{3}$ flowing through a pipe. The acceleration due to gravity is 9.81 m/ $s^{2}$ . If the manometric fluid is water (density 1000 kg/ $m^{3}$ ) and the velocity V is 20 m/s, the differential head h (in mm) between the two arms of the manometer is____________ 20.4

Discussion

1330.	A ship is sailing northwards with a speed of 72 km/h, while wind is blowing west wards with a speed 20 m/s. A flag on the ship will flutter in direction of
Answer» A ship is sailing northwards with a speed of 72 km/h, while wind is blowing west wards with a speed 20 m/s. A flag on the ship will flutter in direction of

Discussion

1331.	Difference between refraction and dispersion
Answer» Difference between refraction and dispersion

Discussion

1332.	A boy, his mother and father have their masses in the respective ratio 1:2:3. Find the ratio of their speeds at which they should run so as to have the same kinetic energy for each of them with respect to ground?
Answer» A boy, his mother and father have their masses in the respective ratio 1:2:3. Find the ratio of their speeds at which they should run so as to have the same kinetic energy for each of them with respect to ground?

Discussion

1333.	6.Two cars A and B race each other. The Car A ran for 4 min at a speed of 25 km/h, slept for54 min and again ran for 2 min at a speed of 7.5km/h. Find the average speed of the car A inthe race.Immersive Reader(2 Points)
Answer» 6.Two cars A and B race each other. The Car A ran for 4 min at a speed of 25 km/h, slept for 54 min and again ran for 2 min at a speed of 7.5km/h. Find the average speed of the car A in the race.Immersive Reader (2 Points)

Discussion

1334.	What are the different sources of electricity?
Answer» What are the different sources of electricity?

Discussion

1335.	How to represent velocity time graph for uniform acceleration Explain with steps
Answer» How to represent velocity time graph for uniform acceleration Explain with steps

1335.

How to represent velocity time graph for uniform acceleration Explain with steps

Answer»

How to represent velocity time graph for uniform acceleration

Explain with steps

Discussion

1336.	An electric bell is suspended in an airtight vacuum jar. The bottom of the jar is connected to an air pump, as shown in the given figure. The air pump can fill air in the jar.What will happen when the switches of both the bell and the pump are pressed?
Answer» An electric bell is suspended in an airtight vacuum jar. The bottom of the jar is connected to an air pump, as shown in the given figure. The air pump can fill air in the jar. What will happen when the switches of both the bell and the pump are pressed?

1336.

An electric bell is suspended in an airtight vacuum jar. The bottom of the jar is connected to an air pump, as shown in the given figure. The air pump can fill air in the jar.What will happen when the switches of both the bell and the pump are pressed?

Answer»

An electric bell is suspended in an airtight vacuum jar. The bottom of the jar is connected to an air pump, as shown in the given figure. The air pump can fill air in the jar.

What will happen when the switches of both the bell and the pump are pressed?

Discussion

1337.	nttwo stationary sources each emit waves of wavelength x. an observer moves from one source to another with velocity u. then no of beats heard by them? n
Answer» nttwo stationary sources each emit waves of wavelength x. an observer moves from one source to another with velocity u. then no of beats heard by them? n

Discussion

1338.	Two mirrors meet at right angles. A ray of light is incident on one at an angle of 30° as shown in Fig. Draw the reflected ray from the second mirror.
Answer» Two mirrors meet at right angles. A ray of light is incident on one at an angle of 30° as shown in Fig. Draw the reflected ray from the second mirror.

Discussion

1339.	An empty glass bottle is fitted with a narrow tube at its mouth. The open end of the tube is kept in a beaker containing water. When the bottle is heated, bubbles of air are seen escaping into the water. Explain the reason.
Answer» An empty glass bottle is fitted with a narrow tube at its mouth. The open end of the tube is kept in a beaker containing water. When the bottle is heated, bubbles of air are seen escaping into the water. Explain the reason.

Discussion

1340.	The position of a ball at five different times, t = 0, t = 1 s, t = 2 s, t = 3 s, and t = 4 s is shown in the figure below. Which of the following position-time graphs is possibly correct for the given situation?
Answer» The position of a ball at five different times, t = 0, t = 1 s, t = 2 s, t = 3 s, and t = 4 s is shown in the figure below. Which of the following position-time graphs is possibly correct for the given situation?

Discussion

1341.	What happens when air is blown between the two inflated balloons hanging by strings?
Answer» What happens when air is blown between the two inflated balloons hanging by strings?

Discussion

1342.	If an elastic film can be modelled as a square grid formed by a very small spring each of stiffness k.show that potential energy U OF THE FILM if stretched uinformally and isotropically in all directions is given by U=K(√S-√So)^2.here So is the area of unstreched film and S is area of stretched film.Now such an elastic film is used to fabricate a spherical ballon of radius ro in relaxed state.Find the dependence of air pressure p inside the ballon on its radius r.Assume vacuum outside the ballon.
Answer» If an elastic film can be modelled as a square grid formed by a very small spring each of stiffness k.show that potential energy U OF THE FILM if stretched uinformally and isotropically in all directions is given by U=K(√S-√So)^2.here So is the area of unstreched film and S is area of stretched film.Now such an elastic film is used to fabricate a spherical ballon of radius ro in relaxed state.Find the dependence of air pressure p inside the ballon on its radius r.Assume vacuum outside the ballon.

Discussion

1343.	What do you mean by electromagnet ? [2 marks]
Answer» What do you mean by electromagnet ? [2 marks]

Discussion

1344.	Kilograms per cubic-meter is the unit of ___ .
Answer» Kilograms per cubic-meter is the unit of ___ .

Discussion

1345.	What is light ? Define it ?
Answer» What is light ? Define it ?

Discussion

1346.	A bus decreases its speed from 80 kmph to 60 kmph in 5 seconds. Find the acceleration of the bus.
Answer» A bus decreases its speed from $80 k m p h$ to $60 k m p h$ in 5 seconds. Find the acceleration of the bus.

Discussion

1347.	Give reasons 1- Diffused reflection takes place on rough surface
Answer» Give reasons 1- Diffused reflection takes place on rough surface

Discussion

1348.	An electroscope is given a positive charge, causing its foil leaves to separate. When an object is brought near the top plate of the electroscope, the foils separate even further because, ___.
Answer» An electroscope is given a positive charge, causing its foil leaves to separate. When an object is brought near the top plate of the electroscope, the foils separate even further because, ___.

1348.

An electroscope is given a positive charge, causing its foil leaves to separate. When an object is brought near the top plate of the electroscope, the foils separate even further because, ___.

Answer»

An electroscope is given a positive charge, causing its foil leaves to separate. When an object is brought near the top plate of the electroscope, the foils separate even further because, ___.

Discussion

1349.	A rabbit and a tortoise are in a race. The tortoise, being the slower of the two, is given a headstart. The rabbit runs at a speed of 40 mi/h and the tortoise at 10 mi/h. If the rabbit catches up with the tortoise in 2 minutes, how much of a headstart did the tortoise get?
Answer» A rabbit and a tortoise are in a race. The tortoise, being the slower of the two, is given a headstart. The rabbit runs at a speed of 40 mi/h and the tortoise at 10 mi/h. If the rabbit catches up with the tortoise in 2 minutes, how much of a headstart did the tortoise get?

Discussion

1350.	The distance between two consecutive compressions (C) or two consecutive rarefactions (R) is called_____.
Answer» The distance between two consecutive compressions (C) or two consecutive rarefactions (R) is called_____.

Discussion

Explore topic-wise InterviewSolutions in .

27.What is RC circuit

Which of the following is/are the modes of heat transfer?

What is the boiling point of water at sea level?

If two people are pulling a box in the same direction with 5 N and 10 N force. Displacement of the box is 18m. Find the net work done.

The temperature inside a refrigerator is t2 C andthe room temperature is t C. The amount of heatdelivered to the room for each joule of electricalenergy consumed ideally will be

A solid iron cuboidal block of dimensions 4.4 m × 2.6 m × 1 m is recast into a cylindrical pipe of radius 100 cm. The length of the pipe is:

40.Four ideal cells of each 10 V are connected as shown in the figure.The current thruogh 2ohm resistor is

Concept of heat and work detail

39.On changing the pressure how many types of ice can be formed? How does pressure matters in fomation of ice? Name all the forms of ice? How they are different from one another?

Question 13 In the arrangements A and B shown in Figure, pins P and Q are fixed to a metal loop and an iron rod with the help of wax. In which case are both the pins likely to fall at different times? Explain.

A man can swim in still water at a speed of 3 km/h .He wants to cross a river that flows at 2 km/h and reach the point directly oppositeto his station point.In which direction ( measured w.r.t water current direction ) should he try to swi

The capacitance of a capacitor with dielectric as a medium is 60 μF. When dielectric is removed, its capacitance changes to 12 μF. The permittivity of the dielectric medium is -

Is there a force of friction between the wheels of a moving train and iron rails? If yes, name the type of friction. If an air cushion can be introduced between the wheel and the rail, what effect will it have on the friction?

Calculate the pressure at a depth of 50 m below the surface of the sea. The density of seawater is 1024 kg/m3. Take g=10m/s2

141.three vectors A, B and C are such that A.B=0 and A.C=0 then the vector parallel to A is

Sheets, tiles etc fixed on the roofs of buildings rise up when strong wind blow outside. Why does this happen?

(a) What are the various precautions to be taken while reading clinical thermometer? (b) Match the following: (i) Land breeze blows during(a) summer(ii) Sea breeze blows during(b) winter(iii) Dark clothes are preferred during(c) day(iv) Light coloured clothes are preferred during(d) night [5 MARKS]

a man shot a bullet with a speed of 20m/s which just penetrate a plank of wood. With what speed should he shoot a bullet to pass through 5 simillar planks?

Where do we short circuit resis†an ces in solving problems

derive the the formula for the potential energy in the spring for 1.when the spring is stretched 2.when the spring is compressed

To what height should an object of mass 2kg be raised so that its potential energy is 980J?

40.A capacitor of capacitance 2uF is connected in the tank circuit of an oscillator oscillating with a frequency of 1kHz. If the current flowing in the circuit is 2mA, the voltage across the capacitor is : 1) 0.16V 2)0.32V 3)79.5V 4)159V

Question 2 (a) Mark T if the statement is true and F if it is false: We can obtain an enlarged and erect image by a convex mirror.

Illustrate the law of conservation of energy by discussing the energy changes which occur when we draw a pendulum bob to one side and allow it to oscillate. Why do the bob eventually come to rest? What happens to its energy eventually? Is it a violation of the law of conservation of energy?

A ship is sailing northwards with a speed of 72 km/h, while wind is blowing west wards with a speed 20 m/s. A flag on the ship will flutter in direction of

Difference between refraction and dispersion

A boy, his mother and father have their masses in the respective ratio 1:2:3. Find the ratio of their speeds at which they should run so as to have the same kinetic energy for each of them with respect to ground?

6.Two cars A and B race each other. The Car A ran for 4 min at a speed of 25 km/h, slept for54 min and again ran for 2 min at a speed of 7.5km/h. Find the average speed of the car A inthe race.Immersive Reader(2 Points)

What are the different sources of electricity?

How to represent velocity time graph for uniform acceleration Explain with steps

An electric bell is suspended in an airtight vacuum jar. The bottom of the jar is connected to an air pump, as shown in the given figure. The air pump can fill air in the jar.What will happen when the switches of both the bell and the pump are pressed?

nttwo stationary sources each emit waves of wavelength x. an observer moves from one source to another with velocity u. then no of beats heard by them? n

Two mirrors meet at right angles. A ray of light is incident on one at an angle of 30° as shown in Fig. Draw the reflected ray from the second mirror.

An empty glass bottle is fitted with a narrow tube at its mouth. The open end of the tube is kept in a beaker containing water. When the bottle is heated, bubbles of air are seen escaping into the water. Explain the reason.

The position of a ball at five different times, t = 0, t = 1 s, t = 2 s, t = 3 s, and t = 4 s is shown in the figure below. Which of the following position-time graphs is possibly correct for the given situation?

What happens when air is blown between the two inflated balloons hanging by strings?

What do you mean by electromagnet ? [2 marks]

Kilograms per cubic-meter is the unit of ___ .

What is light ? Define it ?

A bus decreases its speed from 80 kmph to 60 kmph in 5 seconds. Find the acceleration of the bus.

Give reasons 1- Diffused reflection takes place on rough surface

An electroscope is given a positive charge, causing its foil leaves to separate. When an object is brought near the top plate of the electroscope, the foils separate even further because, ___.

A rabbit and a tortoise are in a race. The tortoise, being the slower of the two, is given a headstart. The rabbit runs at a speed of 40 mi/h and the tortoise at 10 mi/h. If the rabbit catches up with the tortoise in 2 minutes, how much of a headstart did the tortoise get?

The distance between two consecutive compressions (C) or two consecutive rarefactions (R) is called_____.