16569 + Interview Questions in Physics

1.	what is dynamic resistance?
Answer» what is dynamic resistance?

Discussion

2.	The phenomenon of scattering of light by the colloidal particles is called
Answer» The phenomenon of scattering of light by the colloidal particles is called

Discussion

3.	Does sound follow the same laws of reflection as light does? Give some real life examples of reflection of sound.
Answer» Does sound follow the same laws of reflection as light does? Give some real life examples of reflection of sound.

Discussion

4.	In an atomic solid with BCC arrangement of atoms, the atomic radius of the host atom is 270 pm. A guest atom of largest size is present at one of the faces without disturbing original unit cell dimensions. If Coordinates of the centre of this guest atom are (a/2, a/4, 0 ), where 'a' is the side length of unit cell, radius of the guest atom is closest to A) 180 pm B) 135 pm C) 78.57 pm D) 57.5 pm
Answer» In an atomic solid with BCC arrangement of atoms, the atomic radius of the host atom is 270 pm. A guest atom of largest size is present at one of the faces without disturbing original unit cell dimensions. If Coordinates of the centre of this guest atom are (a/2, a/4, 0 ), where 'a' is the side length of unit cell, radius of the guest atom is closest to A) 180 pm B) 135 pm C) 78.57 pm D) 57.5 pm

Discussion

5.	A current of 1.6 ampere is flowing in a conductor. The number of electrons flowing per second through the conductor is
Answer» A current of 1.6 ampere is flowing in a conductor. The number of electrons flowing per second through the conductor is

Discussion

6.	When 92U235 undergoes fission, 0.1 % of its mass is converted into energy. How much mass of 92U235 will be required to produce 10 MJ of energy?
Answer» When $_{92} U^{235}$ undergoes fission, $0.1 %$ of its mass is converted into energy. How much mass of $_{92} U^{235}$ will be required to produce $10 MJ$ of energy?

Discussion

7.	Nine images are formed when two mirrors are held at an angle of
Answer» Nine images are formed when two mirrors are held at an angle of

Discussion

8.	a black body which is at a high temperature T K emitted thermal radiation at the rate of E watt/m^2,. The thermal radiation emitted by a body of emissivity 0.5at temperature T/4 is?
Answer» a black body which is at a high temperature T K emitted thermal radiation at the rate of E watt/m^2,. The thermal radiation emitted by a body of emissivity 0.5at temperature T/4 is?

Discussion

9.	The binding energy per nucleon of O16 is 7.97 MeV and that of O17 is 7.75 MeV. Then, the energy (in MeV) required to remove a neutron from O17 is
Answer» The binding energy per nucleon of $O^{16}$ is 7.97 MeV and that of $O^{17}$ is 7.75 MeV. Then, the energy (in MeV) required to remove a neutron from $O^{17}$ is

Discussion

10.	A 10 cm tall candle, when viewed using a convex lens, appears to be 20 cm tall. The focal length of the lens is 5 cm. What is the object distance?
Answer» A $10 c m$ tall candle, when viewed using a convex lens, appears to be $20 c m$ tall. The focal length of the lens is $5 c m$ . What is the object distance?

Discussion

11.	A student finds the writing on the blackboard as blurred and unclear when sitting on the last desk in the classroom. He, however, sees it clearly when sitting on the front desk at an approximate distance of 2 m from the blackboard. Draw ray diagrams to illustrate the formation of the image of the blackboard writing by his eye-lens when he is seated at the (i) last desk (ii) front desk. Name the kind of lens that would help him to see clearly even when he is seated at the last desk. Draw a ray diagram to illustrate how this lens helps him to see clearly.
Answer» A student finds the writing on the blackboard as blurred and unclear when sitting on the last desk in the classroom. He, however, sees it clearly when sitting on the front desk at an approximate distance of 2 m from the blackboard. Draw ray diagrams to illustrate the formation of the image of the blackboard writing by his eye-lens when he is seated at the (i) last desk (ii) front desk. Name the kind of lens that would help him to see clearly even when he is seated at the last desk. Draw a ray diagram to illustrate how this lens helps him to see clearly.

Discussion

12.	The fraction of sunlight that consists of infrared radiation is?
Answer» The fraction of sunlight that consists of infrared radiation is?

Discussion

13.	What is displacement current How did Maxwell proved the present of displacmet current in an electrical circuit containg a capacitor
Answer» What is displacement current How did Maxwell proved the present of displacmet current in an electrical circuit containg a capacitor

Discussion

14.	a particle is projected with velocity 20m/s at an angle 53^° with vertical.The time in which velocity of particle becomes horizontal is
Answer» a particle is projected with velocity 20m/s at an angle 53^° with vertical.The time in which velocity of particle becomes horizontal is

Discussion

15.	A student was given the following suggestions by his classmates for performing the experiment on finding the focal length of a convex lens:(A) Select any object very far away from the laboratory window(B) Select a well illuminated object far (but not very far) from the laboratory window(C) Keep all the lights of the laboratory on(D) Place the lens between the object and the screen(E) Place the screen between the object and the lens(F) Obtain the sharpest image of the object on the screenHe can perform the experiment better by following the suggestions:(1) A, D, F(2) B, C, E(3) C, F, B(4) D, F, B
Answer» A student was given the following suggestions by his classmates for performing the experiment on finding the focal length of a convex lens: (A) Select any object very far away from the laboratory window (B) Select a well illuminated object far (but not very far) from the laboratory window (C) Keep all the lights of the laboratory on (D) Place the lens between the object and the screen (E) Place the screen between the object and the lens (F) Obtain the sharpest image of the object on the screen He can perform the experiment better by following the suggestions: (1) A, D, F (2) B, C, E (3) C, F, B (4) D, F, B

Discussion

16.	A point source of l8ght is kept at a dis†an ce of 15 cm from a converging lens ,on its optical axis. The focal length of the lens is 10cm and its diameter of aperture is 3cm .A screen is placed on the other side of lens,perpendicular to axis of the lens ,at a dis†an ce of 20cm from it .Find the areawa of the illuminted part of screen?
Answer» A point source of l8ght is kept at a dis†an ce of 15 cm from a converging lens ,on its optical axis. The focal length of the lens is 10cm and its diameter of aperture is 3cm .A screen is placed on the other side of lens,perpendicular to axis of the lens ,at a dis†an ce of 20cm from it .Find the areawa of the illuminted part of screen?

Discussion

17.	59.A long straight current carrying wire of I is bent at its midpoint to form an angle of 45^° . Find the induction of magnetic field at point P distant R from the point of bending
Answer» 59.A long straight current carrying wire of I is bent at its midpoint to form an angle of 45^° . Find the induction of magnetic field at point P distant R from the point of bending

Discussion

18.	Position of isotopes of an element was justified in the modern periodic table.explain
Answer» Position of isotopes of an element was justified in the modern periodic table.explain

Discussion

19.	Two boys A and B of masses 60 kg and 40 kg are standing on a smooth ground at point P and Q of coordinate -10,0,0 and 10,0,0 .if they move towards each other by pulling a comman string,then they will meet at
Answer» Two boys A and B of masses 60 kg and 40 kg are standing on a smooth ground at point P and Q of coordinate -10,0,0 and 10,0,0 .if they move towards each other by pulling a comman string,then they will meet at

Discussion

20.	A magnetic field is produced by the current passing through a long straight wire. When will the strength of the magnetic field increase?
Answer» A magnetic field is produced by the current passing through a long straight wire. When will the strength of the magnetic field increase?

Discussion

21.	How does deforestation affect rainfall?
Answer» How does deforestation affect rainfall?

Discussion

22.	A light beam is travelling from Region I to Region IV. The refractive index in Regions I , II, III and IV are no,no2,no6 and no8 respectively. The angle of incidence θ for which the beam just could not enter region IV is :-
Answer» A light beam is travelling from Region $I$ to Region $IV$ . The refractive index in Regions $I$ , $II$ , $III$ and $IV$ are $n_{o}, \frac{n_{o}}{2}, \frac{n_{o}}{6}$ and $\frac{n_{o}}{8}$ respectively. The angle of incidence $θ$ for which the beam just could not enter region $IV$ is :-

Discussion

23.	Q:- The potential at a point 0.1 m from an isolated point charge is +100V. The nature of the point charge is 1. Positive 2. Negative 3. Zero 4. Either negative or zer
Answer» Q:- The potential at a point 0.1 m from an isolated point charge is +100V. The nature of the point charge is 1. Positive 2. Negative 3. Zero 4. Either negative or zer

Discussion

24.	Question 28 (iii) B1, B2 and B3 are three identical bulbs connected as shown in Figure. When all the three bulbs glow, a current of 3A is recorded by the ammeter A. (iii) How much power is dissipated in the circuit when all the three bulbs glow together?
Answer» Question 28 (iii) $B_{1}, B_{2}$ and $B_{3}$ are three identical bulbs connected as shown in Figure. When all the three bulbs glow, a current of 3A is recorded by the ammeter A. (iii) How much power is dissipated in the circuit when all the three bulbs glow together?

Discussion

25.	Which of the above optical systems (given that all surfaces are made of transparent glass and the bold surfaces represent mirrors) can be considered as a lens?
Answer» Which of the above optical systems (given that all surfaces are made of transparent glass and the bold surfaces represent mirrors) can be considered as a lens?

25.

Which of the above optical systems (given that all surfaces are made of transparent glass and the bold surfaces represent mirrors) can be considered as a lens?

Answer»

Which of the above optical systems (given that all surfaces are made of transparent glass and the bold surfaces represent mirrors) can be considered as a lens?

Discussion

26.	A aeroplane moving horizontally With a speed 180 km/ hr drops a food packet while flying at a height of 490 m .the horizontal range is??
Answer» A aeroplane moving horizontally With a speed 180 km/ hr drops a food packet while flying at a height of 490 m .the horizontal range is??

Discussion

27.	why do some magnetic field lines lie completely ouside a conductor i.e form closed loops outside the conductor
Answer» why do some magnetic field lines lie completely ouside a conductor i.e form closed loops outside the conductor

Discussion

28.	Dispersion of light through a glass prism is the phenomenon of:
Answer» Dispersion of light through a glass prism is the phenomenon of:

Discussion

29.	Which of the following is the working principle of transformer?
Answer» Which of the following is the working principle of transformer?

Discussion

30.	how melting point decreases when pressure is increased?
Answer» how melting point decreases when pressure is increased?

Discussion

31.	A wire is suspended by one end. At the other end a weight equivalent to 20 N force is applied. If the increase in length is 1.0 mm, the increase in energy of the wire will be
Answer» A wire is suspended by one end. At the other end a weight equivalent to 20 N force is applied. If the increase in length is 1.0 mm, the increase in energy of the wire will be

Discussion

32.	178 A sample of gas in a box is at pressure P and temperature T. If number of molecules is doubled and total kinetic energy of the gas is kept constant, then final temperature and pressure will be
Answer» 178 A sample of gas in a box is at pressure P and temperature T. If number of molecules is doubled and total kinetic energy of the gas is kept constant, then final temperature and pressure will be

Discussion

33.	The far-point of a normal healthy eye is located at:
Answer» The far-point of a normal healthy eye is located at:

Discussion

34.	7. is it true that neutrons are made up of a proton and an electron? if yes then how are they stable?
Answer» 7. is it true that neutrons are made up of a proton and an electron? if yes then how are they stable?

Discussion

35.	(a) A charged particle enters at right angles into a uniform magnetic field as shown. What should be the nature of a charge on the particle if it begins to move in a direction pointing vertically out of the page due to its interaction with the magnetic field?(b) Between which two points of a concave mirror should an object be placed to obtain a magnification of, −3?(c) "The refractive index of carbon disulphide is 1.63". What is the meaning of this statement in relation to the speed of light?
Answer» (a) A charged particle enters at right angles into a uniform magnetic field as shown. What should be the nature of a charge on the particle if it begins to move in a direction pointing vertically out of the page due to its interaction with the magnetic field? (b) Between which two points of a concave mirror should an object be placed to obtain a magnification of, −3? (c) "The refractive index of carbon disulphide is 1.63". What is the meaning of this statement in relation to the speed of light?

Discussion

36.	The speed of light in the material of a plano-convex lens is 1.5×10^8 m/s. If the radius of plano-convex lens is 4 cm and its thickness at the centre is 0.4cm, then the focal length of the lens is
Answer» The speed of light in the material of a plano-convex lens is 1.5×10^8 m/s. If the radius of plano-convex lens is 4 cm and its thickness at the centre is 0.4cm, then the focal length of the lens is

Discussion

37.	Question 15 Sound produced by a thunderstorm is heard 10 s after the lightning is seen. Calculate the approximate distance of the thunder cloud. (Given speed of sound = 340 ms−1)
Answer» Question 15 Sound produced by a thunderstorm is heard 10 s after the lightning is seen. Calculate the approximate distance of the thunder cloud. (Given speed of sound = $340 m s^{- 1}$ )

Discussion

38.	An iron tyre is to be fitted on to a wooden wheel 1m in diameter. The diameter of tyre is 6 mm smaller than that of wheel. The tyre should be heated so that its temperature increases by a minimum of (the coefficient of cubical expansion of iron is 3.6×10−5/o C)
Answer» An iron tyre is to be fitted on to a wooden wheel 1m in diameter. The diameter of tyre is 6 mm smaller than that of wheel. The tyre should be heated so that its temperature increases by a minimum of (the coefficient of cubical expansion of iron is $3.6 \times 10^{- 5} /^{o} C$ )

Discussion

39.	28.How to find electric field or potential at an equatorial point of a ring
Answer» 28.How to find electric field or potential at an equatorial point of a ring

Discussion

40.	Amrita Devi Bishnoi was associated with: (a) preventing the custom of child marriage in Rajasthan (b) campaign to save the girl child (c) conservation of cultural heritage of Rajasthan (d) conservation of forests and wildlife
Answer» Amrita Devi Bishnoi was associated with: (a) preventing the custom of child marriage in Rajasthan (b) campaign to save the girl child (c) conservation of cultural heritage of Rajasthan (d) conservation of forests and wildlife

Discussion

41.	Explain stress-strain curve for a given material.
Answer» Explain stress-strain curve for a given material.

Discussion

42.	93.Given that a photon of light of wavelength 10000 angstorm has energy 1.23 eV .Now when light of intensity I and wavelength 5000 angstorm falls on a photo cell the saturation current and stopping potential are 0.40 micro Ampere and 1.36 V respectively. THE workfunction is
Answer» 93.Given that a photon of light of wavelength 10000 angstorm has energy 1.23 eV .Now when light of intensity I and wavelength 5000 angstorm falls on a photo cell the saturation current and stopping potential are 0.40 micro Ampere and 1.36 V respectively. THE workfunction is

Discussion

43.	A convex lens is made up of three different materials as shown in the figure. For a point object placed on its axis, the number of images formed will be
Answer» A convex lens is made up of three different materials as shown in the figure. For a point object placed on its axis, the number of images formed will be

Discussion

44.	State the energy conversion for a HOT CATHODE RAY TUBE.
Answer» State the energy conversion for a HOT CATHODE RAY TUBE.

Discussion

45.	100 g of ice\lbrack latent heat 80 cal/g at 0 C\rbrack is mixed with 100 g of water at 80 C\lbrack specific heat 1 cal/g\rbrack.The final temperature of the mixture will be ?
Answer» 100 g of ice\lbrack latent heat 80 cal/g at 0 C\rbrack is mixed with 100 g of water at 80 C\lbrack specific heat 1 cal/g\rbrack.The final temperature of the mixture will be ?

Discussion

46.	The temperature of equal masses of three different liquids A, B and C are 12∘C,19∘C and 28∘C respectively. The temperature when A and B are mixed is 16∘C and when B and C are mixed it is 23∘C. What should be the temperature in ∘C when A and C are mixed? Answer upto 2 decimal places.
Answer» The temperature of equal masses of three different liquids A, B and C are $12^{\circ} C, 19^{\circ} C$ and $28^{\circ} C$ respectively. The temperature when A and B are mixed is $16^{\circ} C$ and when B and C are mixed it is $23^{\circ} C$ . What should be the temperature in $^{\circ} C$ when A and C are mixed? Answer upto 2 decimal places.

Discussion

47.	Explain the working of an electric motor?
Answer» Explain the working of an electric motor?

Discussion

48.	Find the value of sinθ1 in the diagram given below.Given: nglass=1.5 and nair=1
Answer» Find the value of $sin θ_{1}$ in the diagram given below. Given: $n_{g l a s s} = 1.5$ and $n_{a i r} = 1$

Discussion

49.	Which of the following statement(s) is/are false regarding the adjustment of the eye when viewing objects nearby?
Answer» Which of the following statement(s) is/are false regarding the adjustment of the eye when viewing objects nearby?

Discussion

50.	What's is a critical angle?
Answer» What's is a critical angle?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

what is dynamic resistance?

The phenomenon of scattering of light by the colloidal particles is called

Does sound follow the same laws of reflection as light does? Give some real life examples of reflection of sound.

A current of 1.6 ampere is flowing in a conductor. The number of electrons flowing per second through the conductor is

When 92U235 undergoes fission, 0.1 % of its mass is converted into energy. How much mass of 92U235 will be required to produce 10 MJ of energy?

Nine images are formed when two mirrors are held at an angle of

a black body which is at a high temperature T K emitted thermal radiation at the rate of E watt/m^2,. The thermal radiation emitted by a body of emissivity 0.5at temperature T/4 is?

The binding energy per nucleon of O16 is 7.97 MeV and that of O17 is 7.75 MeV. Then, the energy (in MeV) required to remove a neutron from O17 is

A 10 cm tall candle, when viewed using a convex lens, appears to be 20 cm tall. The focal length of the lens is 5 cm. What is the object distance?

The fraction of sunlight that consists of infrared radiation is?

What is displacement current How did Maxwell proved the present of displacmet current in an electrical circuit containg a capacitor

a particle is projected with velocity 20m/s at an angle 53^° with vertical.The time in which velocity of particle becomes horizontal is

59.A long straight current carrying wire of I is bent at its midpoint to form an angle of 45^° . Find the induction of magnetic field at point P distant R from the point of bending

Position of isotopes of an element was justified in the modern periodic table.explain

Two boys A and B of masses 60 kg and 40 kg are standing on a smooth ground at point P and Q of coordinate -10,0,0 and 10,0,0 .if they move towards each other by pulling a comman string,then they will meet at

A magnetic field is produced by the current passing through a long straight wire. When will the strength of the magnetic field increase?

How does deforestation affect rainfall?

A light beam is travelling from Region I to Region IV. The refractive index in Regions I , II, III and IV are no,no2,no6 and no8 respectively. The angle of incidence θ for which the beam just could not enter region IV is :-

Q:- The potential at a point 0.1 m from an isolated point charge is +100V. The nature of the point charge is 1. Positive 2. Negative 3. Zero 4. Either negative or zer

Question 28 (iii) B1, B2 and B3 are three identical bulbs connected as shown in Figure. When all the three bulbs glow, a current of 3A is recorded by the ammeter A. (iii) How much power is dissipated in the circuit when all the three bulbs glow together?

Which of the above optical systems (given that all surfaces are made of transparent glass and the bold surfaces represent mirrors) can be considered as a lens?

A aeroplane moving horizontally With a speed 180 km/ hr drops a food packet while flying at a height of 490 m .the horizontal range is??

why do some magnetic field lines lie completely ouside a conductor i.e form closed loops outside the conductor

Dispersion of light through a glass prism is the phenomenon of:

Which of the following is the working principle of transformer?

how melting point decreases when pressure is increased?

A wire is suspended by one end. At the other end a weight equivalent to 20 N force is applied. If the increase in length is 1.0 mm, the increase in energy of the wire will be

178 A sample of gas in a box is at pressure P and temperature T. If number of molecules is doubled and total kinetic energy of the gas is kept constant, then final temperature and pressure will be

The far-point of a normal healthy eye is located at:

7. is it true that neutrons are made up of a proton and an electron? if yes then how are they stable?

The speed of light in the material of a plano-convex lens is 1.5×10^8 m/s. If the radius of plano-convex lens is 4 cm and its thickness at the centre is 0.4cm, then the focal length of the lens is

Question 15 Sound produced by a thunderstorm is heard 10 s after the lightning is seen. Calculate the approximate distance of the thunder cloud. (Given speed of sound = 340 ms−1)

An iron tyre is to be fitted on to a wooden wheel 1m in diameter. The diameter of tyre is 6 mm smaller than that of wheel. The tyre should be heated so that its temperature increases by a minimum of (the coefficient of cubical expansion of iron is 3.6×10−5/o C)

28.How to find electric field or potential at an equatorial point of a ring

Amrita Devi Bishnoi was associated with: (a) preventing the custom of child marriage in Rajasthan (b) campaign to save the girl child (c) conservation of cultural heritage of Rajasthan (d) conservation of forests and wildlife

Explain stress-strain curve for a given material.

93.Given that a photon of light of wavelength 10000 angstorm has energy 1.23 eV .Now when light of intensity I and wavelength 5000 angstorm falls on a photo cell the saturation current and stopping potential are 0.40 micro Ampere and 1.36 V respectively. THE workfunction is

A convex lens is made up of three different materials as shown in the figure. For a point object placed on its axis, the number of images formed will be

State the energy conversion for a HOT CATHODE RAY TUBE.

100 g of ice\lbrack latent heat 80 cal/g at 0 C\rbrack is mixed with 100 g of water at 80 C\lbrack specific heat 1 cal/g\rbrack.The final temperature of the mixture will be ?

The temperature of equal masses of three different liquids A, B and C are 12∘C,19∘C and 28∘C respectively. The temperature when A and B are mixed is 16∘C and when B and C are mixed it is 23∘C. What should be the temperature in ∘C when A and C are mixed? Answer upto 2 decimal places.

Explain the working of an electric motor?

Find the value of sinθ1 in the diagram given below.Given: nglass=1.5 and nair=1

Which of the following statement(s) is/are false regarding the adjustment of the eye when viewing objects nearby?

What's is a critical angle?