16569 + Interview Questions in Physics

1.	The focal length of a lens is given by: (Assume terms have standard meanings)
Answer» The focal length of a lens is given by: (Assume terms have standard meanings)

Discussion

2.	Figure show a simplified version of a device known as an lectron gun inside a cathode ray tube, X is a cathode which is heated by means of an electric current in the filament F. Y is a metallic hollow cylinder. F is connected to the terminals T1 and T2, X to the terminal T3 and Y to the terminal T4. What is the utility of 'F' and 'X'?
Answer» Figure show a simplified version of a device known as an lectron gun inside a cathode ray tube, X is a cathode which is heated by means of an electric current in the filament F. Y is a metallic hollow cylinder. F is connected to the terminals T1 and T2, X to the terminal T3 and Y to the terminal T4. What is the utility of 'F' and 'X'?

2.

Figure show a simplified version of a device known as an lectron gun inside a cathode ray tube, X is a cathode which is heated by means of an electric current in the filament F. Y is a metallic hollow cylinder. F is connected to the terminals T1 and T2, X to the terminal T3 and Y to the terminal T4. What is the utility of 'F' and 'X'?

Answer»

Figure show a simplified version of a device known as an lectron gun inside a cathode ray tube, X is a cathode which is heated by means of an electric current in the filament F. Y is a metallic hollow cylinder. F is connected to the terminals T1 and T2, X to the terminal T3 and Y to the terminal T4. What is the utility of 'F' and 'X'?

Discussion

3.	The resistivity of a resistor is 5 Ω−m. Its length is 1m and area of cross section is 2mm2. The resistance is .
Answer» The resistivity of a resistor is 5 $Ω - m$ . Its length is 1 $m$ and area of cross section is $2 m m^{2}$ . The resistance is .

Discussion

4.	For a concave mirror, the principal focus is ..................... the reflecting surface.
Answer» For a concave mirror, the principal focus is ..................... the reflecting surface.

Discussion

5.	5 Which of the following statements given below arefalse?Becquerel discovered radioactivityb. Fraunhoffer lines were first discovered byWollastornc. Photoelectric effect was discovered by Einstein1) a, b & c(2) a & c(3) b & c(4) c only
Answer» 5 Which of the following statements given below arefalse?Becquerel discovered radioactivityb. Fraunhoffer lines were first discovered byWollastornc. Photoelectric effect was discovered by Einstein1) a, b & c(2) a & c(3) b & c(4) c only

Discussion

6.	The ratio between image height to the object height is called:
Answer» The ratio between image height to the object height is called:

Discussion

7.	If the acceleration due to gravity. g. is 10msa is 10m/s at the n at a height of surface of the earth (radius 6400 km), the 1600 km the value of g will be (in m/ s2)
Answer» If the acceleration due to gravity. g. is 10msa is 10m/s at the n at a height of surface of the earth (radius 6400 km), the 1600 km the value of g will be (in m/ s2)

Discussion

8.	In what respect does the wave pattern of a noise and music differ ? Draw diagram to explain your answer.
Answer» In what respect does the wave pattern of a noise and music differ ? Draw diagram to explain your answer.

Discussion

9.	What is the use of commutator in dc motor
Answer» What is the use of commutator in dc motor

Discussion

10.	(a) What is nuclear fusion ? Explain with an example. Write the equation of the reaction involved (b) Why are very high temperatures required for fusion to occur ?
Answer» (a) What is nuclear fusion ? Explain with an example. Write the equation of the reaction involved (b) Why are very high temperatures required for fusion to occur ?

Discussion

11.	The focal length of a concave mirror is f and the distance from the object to the principle focus is x. The ratio of the size of the image to the size of the object is [Kerala PET 2005]
Answer» The focal length of a concave mirror is f and the distance from the object to the principle focus is x. The ratio of the size of the image to the size of the object is [Kerala PET 2005]

Discussion

12.	Four Faraday of electricity is passed through AgNO3(l), CdSO4(l),AlCl3(l) and PbCl4(l) kept in four vessels using inert electrodes .The ratio of moles of At,Cd,Al,Pb deposited will be ?
Answer» Four Faraday of electricity is passed through AgNO3(l), CdSO4(l),AlCl3(l) and PbCl4(l) kept in four vessels using inert electrodes .The ratio of moles of At,Cd,Al,Pb deposited will be ?

Discussion

13.	what are the normal frequency of AC current delivered to our homes.do DC current also have some frequency is not so why
Answer» what are the normal frequency of AC current delivered to our homes.do DC current also have some frequency is not so why

Discussion

14.	acceleration due to gravity at depth=Gp4/3π(Re-d) (where p is rho Re is the radius of the earth and d is the depth pf the object) but, accelearation due to gravity at depth =g(1-d/Re) what's the difference?
Answer» acceleration due to gravity at depth=Gp4/3π(Re-d) (where p is rho Re is the radius of the earth and d is the depth pf the object) but, accelearation due to gravity at depth =g(1-d/Re) what's the difference?

Discussion

15.	In Frankel defect, as the cation is not in equilibrium. Did this affect the stability of compound?
Answer» In Frankel defect, as the cation is not in equilibrium. Did this affect the stability of compound?

Discussion

16.	Question 30Observe the vessels A, B, C and D shown in Fig. carefully.Volume of water taken in each vessel is as shown. Arrange them in the order of decreasing pressure at the base of each vessel. Explain.
Answer» Question 30 Observe the vessels A, B, C and D shown in Fig. carefully. Volume of water taken in each vessel is as shown. Arrange them in the order of decreasing pressure at the base of each vessel. Explain.

Discussion

17.	What determines the direction of flow of heat between two objects in contact?
Answer» What determines the direction of flow of heat between two objects in contact?

Discussion

18.	The product of mass and velocity is called:
Answer» The product of mass and velocity is called:

Discussion

19.	(a) State and explain the law of conservation of energy with an example.(b) Explain how, the total energy a swinging pendulum at any instant of time remains conserved. Illustrate your answer with the help of a labelled diagram.
Answer» (a) State and explain the law of conservation of energy with an example. (b) Explain how, the total energy a swinging pendulum at any instant of time remains conserved. Illustrate your answer with the help of a labelled diagram.

Discussion

20.	35.A light ray of angle of incidence 40degree emerged from the prism in minimum deviation position. Then what is the angle of incidence on second surface? (1)90 (2)0 (3)40 (4)20
Answer» 35.A light ray of angle of incidence 40degree emerged from the prism in minimum deviation position. Then what is the angle of incidence on second surface? (1)90 (2)0 (3)40 (4)20

Discussion

21.	When do u take image distance positive or negative? When do u take object distance negative or positive? Plzz explain it in detail
Answer» When do u take image distance positive or negative? When do u take object distance negative or positive? Plzz explain it in detail

21.

When do u take image distance positive or negative? When do u take object distance negative or positive? Plzz explain it in detail

Answer»

When do u take image distance positive or negative?

When do u take object distance negative or positive?

Plzz explain it in detail

Discussion

22.	An object is placed 0.5m in front of a convex lens.At what distance, should a screen be placed in order to create an image with a magnification of 1.5 and if the height of the image and object are equal, what is the focal length of the lens?
Answer» An object is placed 0.5m in front of a convex lens.At what distance, should a screen be placed in order to create an image with a magnification of 1.5 and if the height of the image and object are equal, what is the focal length of the lens?

Discussion

23.	A magnifying lens is of focal length 10 cm. At what dis†an ce from the lens an object should be placed to view the object at maximum magnification
Answer» A magnifying lens is of focal length 10 cm. At what dis†an ce from the lens an object should be placed to view the object at maximum magnification

Discussion

24.	At 60^° and 1 atm, N_2O_4 is 50% dissociated into NO_2 then k_p is (1) 1.33 atm (2) 2 atm (3) 2.67 atm (4) 3 atm
Answer» At 60^° and 1 atm, N_2O_4 is 50% dissociated into NO_2 then k_p is (1) 1.33 atm (2) 2 atm (3) 2.67 atm (4) 3 atm

Discussion

25.	Out of the following ions which one is colourless?
Answer» Out of the following ions which one is colourless?

Discussion

26.	A ray of light travelling in a medium of refractive index n,is incident on a medium of refractive index n2(< n1) at an angle of incidence e. The reflected and refracted rays make an angle of 120^° with each other. Then the criticalangle for the boundary separating the two media is(1) sin tan02(2) sin-1V3 +tano2tan0(3) sin 43 -tan(4) sin -(2cot 0)
Answer» A ray of light travelling in a medium of refractive index n,is incident on a medium of refractive index n2(< n1) at an angle of incidence e. The reflected and refracted rays make an angle of 120^° with each other. Then the criticalangle for the boundary separating the two media is(1) sin tan02(2) sin-1V3 +tano2tan0(3) sin 43 -tan(4) sin -(2cot 0)

Discussion

27.	In the case of constants a and b of a transistor
Answer» In the case of constants a and b of a transistor

Discussion

28.	Two positive charges separated by a distance 2m each other with a force of 0.36 N. If the combined charge is 26uc, the charges are A) 20uc, 6uc B) 16uc, 10uc C) 18uc, 8uc D) 13uc,13uc
Answer» *Two positive charges separated by a distance 2m each other with a force of 0.36 N. If the combined charge is 26uc*, the charges are A) 20uc, 6uc B) 16uc, 10uc C) 18uc, 8uc D) 13uc,13uc

Discussion

29.	Magnetic field lines:
Answer» Magnetic field lines:

Discussion

30.	Circuit when connected to the an AC source 12 volt gives the current of 0.2 ampere same current when connected to the DC source 12 v, gives current of.0.4 A,m. the circuit isA) seriesLR. B) series RCC) series LC. D) series LCR
Answer» Circuit when connected to the an AC source 12 volt gives the current of 0.2 ampere same current when connected to the DC source 12 v, gives current of.0.4 A,m. the circuit is A) seriesLR. B) series RC C) series LC. D) series LCR

Discussion

31.	In Fleming’s right-hand rule:
Answer» In Fleming’s right-hand rule:

Discussion

32.	(a) Draw a V-I graph for a conductor obeying Ohm's law. (b) What does the slope of V-I graph for a conductor represent?
Answer» (a) Draw a V-I graph for a conductor obeying Ohm's law. (b) What does the slope of V-I graph for a conductor represent?

32.

(a) Draw a V-I graph for a conductor obeying Ohm's law. (b) What does the slope of V-I graph for a conductor represent?

Answer»

(a) Draw a V-I graph for a conductor obeying Ohm's law.

(b) What does the slope of V-I graph for a conductor represent?

Discussion

33.	42.Difference between reverberation and echo
Answer» 42.Difference between reverberation and echo

Discussion

34.	An inductor L=2 H and a resistance R=8 Ω are connected in series with a battery of emf E=8 V. The maximum rate at which the energy is stored in the magnetic field is (in W).(integer only)
Answer» An inductor $L = 2 H$ and a resistance $R = 8 Ω$ are connected in series with a battery of emf $E = 8 V .$ The maximum rate at which the energy is stored in the magnetic field is $(in W)$ .(integer only)

Discussion

35.	A neutral atom 'X' has a mass number 12 and atomic number 6. Calculate the number of electrons present in the atom.
Answer» A neutral atom 'X' has a mass number 12 and atomic number 6. Calculate the number of electrons present in the atom.

Discussion

36.	If all rays falling on a concave mirror are parallel to the principal axis of the mirror, what happens to them after reflection from the mirror?
Answer» If all rays falling on a concave mirror are parallel to the principal axis of the mirror, what happens to them after reflection from the mirror?

Discussion

37.	Natural resources are both living and non-living. Do you agree? Give examples of each.
Answer» Natural resources are both living and non-living. Do you agree? Give examples of each.

Discussion

38.	How should the several electric lamps be connected with the mains so that the switching on or off a lamp has no effect on the operation of other lamps?
Answer» How should the several electric lamps be connected with the mains so that the switching on or off a lamp has no effect on the operation of other lamps?

38.

How should the several electric lamps be connected with the mains so that the switching on or off a lamp has no effect on the operation of other lamps?

Answer»

How should the several electric lamps be connected with the mains so that the switching on or off a lamp has no effect on the operation of other lamps?

Discussion

39.	What do you think electrical energy actually is ? for what do you pay your electricity Bill ?
Answer» What do you think electrical energy actually is ? for what do you pay your electricity Bill ?

Discussion

40.	Magnification is -1 what type of mirror is it and the position of the image and the nature of the image is -
Answer» Magnification is -1 what type of mirror is it and the position of the image and the nature of the image is -

Discussion

41.	Two wires A and B are of equal length and have equal resistance .If the resistivity of A is more than that of B Which wire is thicker and why?
Answer» Two wires A and B are of equal length and have equal resistance .If the resistivity of A is more than that of B Which wire is thicker and why?

Discussion

42.	Household appliances are connected in _______.
Answer» Household appliances are connected in _______.

Discussion

43.	2 kg ice at -20 degree celsius is mixed with 5 kg water at 20 degree celsius. Then final amount of water in the mixture would be; Given specific heat of ice = 0.5 cal/g degree celsius, Specific heat of water = 1 cal/g degree celsius (1) 6 kg (2) 5 kg (3) 4 kg (4) 2 kg
Answer» 2 kg ice at -20 degree celsius is mixed with 5 kg water at 20 degree celsius. Then final amount of water in the mixture would be; Given specific heat of ice = 0.5 cal/g degree celsius, Specific heat of water = 1 cal/g degree celsius (1) 6 kg (2) 5 kg (3) 4 kg (4) 2 kg

Discussion

44.	An electric heater of resistance 8 ohms draws 15 A from the service mains for 2 hours. Calculate the rate at which heat is developed in the heater. (Give your answer in Js)
Answer» An electric heater of resistance 8 ohms draws 15 A from the service mains for 2 hours. Calculate the rate at which heat is developed in the heater. (Give your answer in $\frac{J}{s}$ )

Discussion

45.	Question 3 (c)State whether the following statement is true or false.If the amplitude of vibration is large, the sound is feeble.
Answer» Question 3 (c) State whether the following statement is true or false. If the amplitude of vibration is large, the sound is feeble.

Discussion

46.	Can air be used to generate electricity? How?
Answer» Can air be used to generate electricity? How?

Discussion

47.	25.Coulomb law only valid for point charge what does it mean
Answer» 25.Coulomb law only valid for point charge what does it mean

Discussion

48.	A quarter horse power motor runs at a speed of 600 rpm. Assuming 40% efficiency,the work done by the motor in one rotation will be a)7.46 J b)7400J c)74.6J d)7.46 erg
Answer» A quarter horse power motor runs at a speed of 600 rpm. Assuming 40% efficiency,the work done by the motor in one rotation will be a)7.46 J b)7400J c)74.6J d)7.46 erg

Discussion

49.	A string fixed at both ends vibrates in a resonant mode with separation of 6 cm between the consecutive nodes. For the next to next higher resonant frequency this separation is reduced by 2 cm. The length of the string is 1. 8cm 2. 16cm 3. 24cm 4. 32c
Answer» A string fixed at both ends vibrates in a resonant mode with separation of 6 cm between the consecutive nodes. For the next to next higher resonant frequency this separation is reduced by 2 cm. The length of the string is 1. 8cm 2. 16cm 3. 24cm 4. 32c

Discussion

50.	18.How to prove that angle of incidence is equal to angle of reflection?
Answer» 18.How to prove that angle of incidence is equal to angle of reflection?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The focal length of a lens is given by: (Assume terms have standard meanings)

The resistivity of a resistor is 5 Ω−m. Its length is 1m and area of cross section is 2mm2. The resistance is .

For a concave mirror, the principal focus is ..................... the reflecting surface.

5 Which of the following statements given below arefalse?Becquerel discovered radioactivityb. Fraunhoffer lines were first discovered byWollastornc. Photoelectric effect was discovered by Einstein1) a, b & c(2) a & c(3) b & c(4) c only

The ratio between image height to the object height is called:

If the acceleration due to gravity. g. is 10msa is 10m/s at the n at a height of surface of the earth (radius 6400 km), the 1600 km the value of g will be (in m/ s2)

In what respect does the wave pattern of a noise and music differ ? Draw diagram to explain your answer.

What is the use of commutator in dc motor

(a) What is nuclear fusion ? Explain with an example. Write the equation of the reaction involved (b) Why are very high temperatures required for fusion to occur ?

The focal length of a concave mirror is f and the distance from the object to the principle focus is x. The ratio of the size of the image to the size of the object is [Kerala PET 2005]

Four Faraday of electricity is passed through AgNO3(l), CdSO4(l),AlCl3(l) and PbCl4(l) kept in four vessels using inert electrodes .The ratio of moles of At,Cd,Al,Pb deposited will be ?

what are the normal frequency of AC current delivered to our homes.do DC current also have some frequency is not so why

acceleration due to gravity at depth=Gp4/3π(Re-d) (where p is rho Re is the radius of the earth and d is the depth pf the object) but, accelearation due to gravity at depth =g(1-d/Re) what's the difference?

In Frankel defect, as the cation is not in equilibrium. Did this affect the stability of compound?

Question 30Observe the vessels A, B, C and D shown in Fig. carefully.Volume of water taken in each vessel is as shown. Arrange them in the order of decreasing pressure at the base of each vessel. Explain.

What determines the direction of flow of heat between two objects in contact?

The product of mass and velocity is called:

(a) State and explain the law of conservation of energy with an example.​(b) Explain how, the total energy a swinging pendulum at any instant of time remains conserved. Illustrate your answer with the help of a labelled diagram.

35.A light ray of angle of incidence 40degree emerged from the prism in minimum deviation position. Then what is the angle of incidence on second surface? (1)90 (2)0 (3)40 (4)20

When do u take image distance positive or negative? When do u take object distance negative or positive? Plzz explain it in detail

An object is placed 0.5m in front of a convex lens.At what distance, should a screen be placed in order to create an image with a magnification of 1.5 and if the height of the image and object are equal, what is the focal length of the lens?

A magnifying lens is of focal length 10 cm. At what dis†an ce from the lens an object should be placed to view the object at maximum magnification

At 60^° and 1 atm, N_2O_4 is 50% dissociated into NO_2 then k_p is (1) 1.33 atm (2) 2 atm (3) 2.67 atm (4) 3 atm

Out of the following ions which one is colourless?

In the case of constants a and b of a transistor

Two positive charges separated by a distance 2m each other with a force of 0.36 N. If the combined charge is 26uc, the charges are A) 20uc, 6uc B) 16uc, 10uc C) 18uc, 8uc D) 13uc,13uc

Magnetic field lines:

Circuit when connected to the an AC source 12 volt gives the current of 0.2 ampere same current when connected to the DC source 12 v, gives current of.0.4 A,m. the circuit isA) seriesLR. B) series RCC) series LC. D) series LCR

In Fleming’s right-hand rule:

(a) Draw a V-I graph for a conductor obeying Ohm's law. (b) What does the slope of V-I graph for a conductor represent?

42.Difference between reverberation and echo

An inductor L=2 H and a resistance R=8 Ω are connected in series with a battery of emf E=8 V. The maximum rate at which the energy is stored in the magnetic field is (in W).(integer only)

A neutral atom 'X' has a mass number 12 and atomic number 6. Calculate the number of electrons present in the atom.

If all rays falling on a concave mirror are parallel to the principal axis of the mirror, what happens to them after reflection from the mirror?

Natural resources are both living and non-living. Do you agree? Give examples of each.

How should the several electric lamps be connected with the mains so that the switching on or off a lamp has no effect on the operation of other lamps?

What do you think electrical energy actually is ? for what do you pay your electricity Bill ?

Magnification is -1 what type of mirror is it and the position of the image and the nature of the image is -

Two wires A and B are of equal length and have equal resistance .If the resistivity of A is more than that of B Which wire is thicker and why?

Household appliances are connected in _______.

2 kg ice at -20 degree celsius is mixed with 5 kg water at 20 degree celsius. Then final amount of water in the mixture would be; Given specific heat of ice = 0.5 cal/g degree celsius, Specific heat of water = 1 cal/g degree celsius (1) 6 kg (2) 5 kg (3) 4 kg (4) 2 kg

An electric heater of resistance 8 ohms draws 15 A from the service mains for 2 hours. Calculate the rate at which heat is developed in the heater. (Give your answer in Js)

Question 3 (c)State whether the following statement is true or false.If the amplitude of vibration is large, the sound is feeble.

Can air be used to generate electricity? How?

25.Coulomb law only valid for point charge what does it mean

A quarter horse power motor runs at a speed of 600 rpm. Assuming 40% efficiency,the work done by the motor in one rotation will be a)7.46 J b)7400J c)74.6J d)7.46 erg

A string fixed at both ends vibrates in a resonant mode with separation of 6 cm between the consecutive nodes. For the next to next higher resonant frequency this separation is reduced by 2 cm. The length of the string is 1. 8cm 2. 16cm 3. 24cm 4. 32c

18.How to prove that angle of incidence is equal to angle of reflection?

(a) State and explain the law of conservation of energy with an example.(b) Explain how, the total energy a swinging pendulum at any instant of time remains conserved. Illustrate your answer with the help of a labelled diagram.