16569 + Interview Questions in Physics

1.	A pebble is thrown up. It goes to a height and then comes back on the ground. State the different changes in form of energy during its motion.
Answer» A pebble is thrown up. It goes to a height and then comes back on the ground. State the different changes in form of energy during its motion.

Discussion

2.	During dispersion of white light by prism placed in air,
Answer» During dispersion of white light by prism placed in air,

Discussion

3.	How does mirage happen?
Answer» How does mirage happen?

Discussion

4.	If f is the focal length of the lens, then the power of a lens is equal to
Answer» If f is the focal length of the lens, then the power of a lens is equal to

Discussion

5.	Calculate the cost of operating a heater of 500 W for 20 hrs at rate of Rs 3.90 per unit. What is ' per unit' please solve it sir / ma'am.
Answer» Calculate the cost of operating a heater of 500 W for 20 hrs at rate of Rs 3.90 per unit. What is ' per unit' please solve it sir / ma'am.

5.

Calculate the cost of operating a heater of 500 W for 20 hrs at rate of Rs 3.90 per unit. What is ' per unit' please solve it sir / ma'am.

Answer»

Calculate the cost of operating a heater of 500 W for 20 hrs at rate of Rs 3.90 per unit.

What is ' per unit' please solve it sir / ma'am.

Discussion

6.	Glass and water have a reflective index of 1.52 and 1.34 respectively. What is the refractive index of glass with respect to water? How much time will light take to pass through hypothetical tube of 40,000 km half filled with water and other half filled with glass. Take C = 3×108 m/s .
Answer» Glass and water have a reflective index of 1.52 and 1.34 respectively. What is the refractive index of glass with respect to water? How much time will light take to pass through hypothetical tube of 40,000 km half filled with water and other half filled with glass. Take C = 3×10⁸ m/s .

Discussion

7.	The sensation of seeing an object remains for about _____ of a second after the object is removed from the view.
Answer» The sensation of seeing an object remains for about _____ of a second after the object is removed from the view.

Discussion

8.	Nowadays we are using alternate or non-conventional sources of energy more. Why?
Answer» Nowadays we are using alternate or non-conventional sources of energy more. Why?

Discussion

9.	What is potential drop? Why does it happen?
Answer» What is potential drop? Why does it happen?

Discussion

10.	For passengers flying at very high altitude, sky appears dark. Why?
Answer» For passengers flying at very high altitude, sky appears dark. Why?

Discussion

11.	The fuel which is not obtained from biomass is : (a) firewood (b) cow-dung cakes (c) coke (d) charcoal
Answer» The fuel which is not obtained from biomass is : (a) firewood (b) cow-dung cakes (c) coke (d) charcoal

Discussion

12.	The refractive index of glass is 32. Speed of light in glass would be
Answer» The refractive index of glass is $\frac{3}{2}$ . Speed of light in glass would be

Discussion

13.	Two small identical electrical dipoles AB and CD, each of dipole moment 'p' is kept at an angle 120∘. What is the resultant dipole moment of this combination? If this system is subjected to an electric field (E vector) directed along the + x-direction, what will be the magnitude and direction of the torque acting on this?
Answer» Two small identical electrical dipoles AB and CD, each of dipole moment 'p' is kept at an angle $120^{\circ}$ . What is the resultant dipole moment of this combination? If this system is subjected to an electric field (E vector) directed along the + x-direction, what will be the magnitude and direction of the torque acting on this?

Discussion

14.	A diverging lens of focal length 20 cm and a converging lens of focal length 30 cm are placed 15 cm apart with their principal axes coinciding. Where should an object be placed on the principal axis so that its image is formed at infinity ?
Answer» A diverging lens of focal length 20 cm and a converging lens of focal length 30 cm are placed 15 cm apart with their principal axes coinciding. Where should an object be placed on the principal axis so that its image is formed at infinity ?

Discussion

15.	Why is it necessary to have an earth wire installed in a power circuit, but not in a lighting circuit?
Answer» Why is it necessary to have an earth wire installed in a power circuit, but not in a lighting circuit?

15.

Why is it necessary to have an earth wire installed in a power circuit, but not in a lighting circuit?

Answer»

Why is it necessary to have an earth wire installed in a power circuit, but not in a lighting circuit?

Discussion

16.	Real and virtual image where does real image form plane ,concave ,convex mirror and how?
Answer» Real and virtual image where does real image form plane ,concave ,convex mirror and how?

Discussion

17.	How placing an iron core in a solenoid can increase the strength of an electromagnet?
Answer» How placing an iron core in a solenoid can increase the strength of an electromagnet?

Discussion

18.	Neutrons are made up of one up quark and two down quarks and the quarks have chare..... So why neutrons do not have charge ?
Answer» Neutrons are made up of one up quark and two down quarks and the quarks have chare..... So why neutrons do not have charge ?

18.

Neutrons are made up of one up quark and two down quarks and the quarks have chare..... So why neutrons do not have charge ?

Answer»

Neutrons are made up of one up quark and two down quarks and the quarks have chare.....

So why neutrons do not have charge ?

Discussion

19.	A concave mirror having a radius of curvature 40 cm is placed in front of an illuminated point source at a distance of 30 cm from it. Find the location of the image.
Answer» A concave mirror having a radius of curvature 40 cm is placed in front of an illuminated point source at a distance of 30 cm from it. Find the location of the image.

Discussion

20.	A bullet of mass 10gm strikes a fixed target and penetrates 8cm into it. If average resistance offered by the target to the bullet is 100N. What is the velocity with which the bullet hits the target? I am really sorry, but this question is out of syllabus and I genuinely want the solution and that's why I put wrong chapter name.
Answer» A bullet of mass 10gm strikes a fixed target and penetrates 8cm into it. If average resistance offered by the target to the bullet is 100N. What is the velocity with which the bullet hits the target? I am really sorry, but this question is out of syllabus and I genuinely want the solution and that's why I put wrong chapter name.

20.

A bullet of mass 10gm strikes a fixed target and penetrates 8cm into it. If average resistance offered by the target to the bullet is 100N. What is the velocity with which the bullet hits the target? I am really sorry, but this question is out of syllabus and I genuinely want the solution and that's why I put wrong chapter name.

Answer»

A bullet of mass 10gm strikes a fixed target and penetrates 8cm into it. If average resistance offered by the target to the bullet is 100N. What is the velocity with which the bullet hits the target?

I am really sorry, but this question is out of syllabus and I genuinely want the solution and that's why I put wrong chapter name.

Discussion

21.	What is kreb cycle?
Answer» What is kreb cycle?

Discussion

22.	The insulator of electricity is : (a) copper (b) acidulated water (c) human body (d) silk
Answer» The insulator of electricity is : (a) copper (b) acidulated water (c) human body (d) silk

22.

The insulator of electricity is : (a) copper (b) acidulated water (c) human body (d) silk

Answer»

The insulator of electricity is :

(a) copper (b) acidulated water

(c) human body (d) silk

Discussion

23.	What are the sign conventions for loop law and can you please give an example for loop law and explain it.
Answer» What are the sign conventions for loop law and can you please give an example for loop law and explain it.

Discussion

24.	At absolute zero temperatures ..... Materials become superconductive..... Electricity pass through them without any resistance ..... According to 'V=IR' , R becomes zero ,then if resistance becomes zero do u think that any kind of potential difference exists???? And if not ...how can electrons travel through a conductor??? at such weird temperatures?
Answer» At absolute zero temperatures ..... Materials become superconductive..... Electricity pass through them without any resistance ..... According to 'V=IR' , R becomes zero ,then if resistance becomes zero do u think that any kind of potential difference exists???? And if not ...how can electrons travel through a conductor??? at such weird temperatures?

Discussion

25.	In some states, the purest form of rainwater is known as
Answer» In some states, the purest form of rainwater is known as

Discussion

26.	The value of angular magnification if the final image is formed at near point, instead of infinity is .
Answer» The value of angular magnification if the final image is formed at near point, instead of infinity is .

Discussion

27.	what is zeeman effect? what is stark effect?
Answer» what is zeeman effect? what is stark effect?

27.

what is zeeman effect? what is stark effect?

Answer»

what is zeeman effect?

what is stark effect?

Discussion

28.	Name a piece of apparatus other than plane mirror, which can be used to turn a ray of light through 90 degree ? Do I need to specify the type of prism used(the isosceles prism) ?
Answer» Name a piece of apparatus other than plane mirror, which can be used to turn a ray of light through 90 degree ? Do I need to specify the type of prism used(the isosceles prism) ?

Discussion

29.	Name the phenomenon due to which afterimage persists for a fraction of second.
Answer» Name the phenomenon due to which afterimage persists for a fraction of second.

Discussion

30.	To determine focal length of a concave mirror a student obtains the image of a well lit distant object on a screen. To determine the focal length of the given concave mirror he needs to measures the distance between:
Answer» To determine focal length of a concave mirror a student obtains the image of a well lit distant object on a screen. To determine the focal length of the given concave mirror he needs to measures the distance between:

Discussion

31.	Wind flows because of which of the following reason?
Answer» Wind flows because of which of the following reason?

Discussion

32.	(a) With the help of a labelled diagram, explain how a concave lens diverges a beam of parallel light rays. Mark the principal axis, optical centre, principal focus and focal length of the concave lens on the diagram. (b) State whether concave lens has a real focus or a virtual focus. (c) List some things that concave lens and convex mirror have in common.
Answer» (a) With the help of a labelled diagram, explain how a concave lens diverges a beam of parallel light rays. Mark the principal axis, optical centre, principal focus and focal length of the concave lens on the diagram. (b) State whether concave lens has a real focus or a virtual focus. (c) List some things that concave lens and convex mirror have in common.

Discussion

33.	Find the critical angle for a ray of light travelling from glass to air. [μg = √2 , μa = 1]
Answer» Find the critical angle for a ray of light travelling from glass to air. [ $μ_{g}$ = $\sqrt{2}$ , $μ_{a}$ = 1]

Discussion

34.	When electrons in a conductor flow from their atoms , does the composition or properties of the element's atom change ?
Answer» When electrons in a conductor flow from their atoms , does the composition or properties of the element's atom change ?

Discussion

35.	A motor converts one form of energy into another. Name the two forms.
Answer» A motor converts one form of energy into another. Name the two forms.

Discussion

36.	During the emission of a beta particle, the quantity that remains the same is
Answer» During the emission of a beta particle, the quantity that remains the same is

Discussion

37.	Why is biogas considered an ideal fuel for domestic use ?
Answer» Why is biogas considered an ideal fuel for domestic use ?

Discussion

38.	Which of the following metal is not attracted by a magnet?
Answer» Which of the following metal is not attracted by a magnet?

Discussion

39.	Prove that Refractive index = real depthapparent depth
Answer» Prove that Refractive index = $\frac{r e a l d e p t h}{a p p a r e n t d e p t h}$

39.

Prove that Refractive index = real depthapparent depth

Answer»

Prove that

Refractive index = $\frac{r e a l d e p t h}{a p p a r e n t d e p t h}$

Discussion

40.	A skydiver weighing 60 kg moves through a distance of 40 m upwards in 2 seconds. The power spent by the skydiver due to its weight (in Watt) is ___ . Take g =9.8 m/s2
Answer» A skydiver weighing 60 kg moves through a distance of 40 m upwards in 2 seconds. The power spent by the skydiver due to its weight (in Watt) is ___ . $T a k e g = 9.8 m / s^{2}$

Discussion

41.	A truck has a mass of 1600 kg. If the truck has to be stopped with a negative acceleration of 1.8 ms-2. What is the force of friction between the truck and the road? (Give your answer in N) ___
Answer» A truck has a mass of 1600 kg. If the truck has to be stopped with a negative acceleration of 1.8 ms^-2. What is the force of friction between the truck and the road? (Give your answer in N) ___

Discussion

42.	Choose the word which best fills the blank from the four options given. I caught a ___ of him in the crowd for a fleeting moment before he disappeared.
Answer» Choose the word which best fills the blank from the four options given. I caught a ___ of him in the crowd for a fleeting moment before he disappeared.

Discussion

43.	Match the electron shells with the corresponding number of electrons present.
Answer» Match the electron shells with the corresponding number of electrons present.

Discussion

44.	A rod PQ of mass M and length L is hinged at end P. The rod is kept horizontal by a massless string tied to point Q as shown in figure. When string is cut, the initial angular acceleration of the rod is
Answer» A rod PQ of mass M and length L is hinged at end P. The rod is kept horizontal by a massless string tied to point Q as shown in figure. When string is cut, the initial angular acceleration of the rod is

Discussion

45.	Find the distance (u) of an object, of height ho=5 cm from the optical centre of a concave lens, so that its image is formed 15 cm away from lens? Also, find the size of the image (hi)? Focal length of concave lens, f=30 cm.
Answer» Find the distance $(u)$ of an object, of height $h_{o} = 5 c m$ from the optical centre of a concave lens, so that its image is formed $15 c m$ away from lens? Also, find the size of the image ( $h_{i}$ )? Focal length of concave lens, $f = 30 c m$ .

Discussion

46.	The frequency of a source of sound is 100 Hz. The number of sound wave produced in one minute is
Answer» The frequency of a source of sound is $100 H z$ . The number of sound wave produced in one minute is

Discussion

47.	Name the part of our eyes which helps us to focus near and distant objects in quick succession.
Answer» Name the part of our eyes which helps us to focus near and distant objects in quick succession.

Discussion

48.	For a current in a long straight solenoid, N and S poles are created at the two ends. Among the following statements, the incorrect statement is:
Answer» For a current in a long straight solenoid, N and S poles are created at the two ends. Among the following statements, the incorrect statement is:

Discussion

49.	Explain Domestic electric circuit.
Answer» Explain Domestic electric circuit.

Discussion

50.	If lens I has a focal length of + 15 cm and lens II has a focal length of + 30 cm. Which lens has more power?
Answer» If lens I has a focal length of + 15 cm and lens II has a focal length of + 30 cm. Which lens has more power?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A pebble is thrown up. It goes to a height and then comes back on the ground. State the different changes in form of energy during its motion.

During dispersion of white light by prism placed in air,

How does mirage happen?

If f is the focal length of the lens, then the power of a lens is equal to

Calculate the cost of operating a heater of 500 W for 20 hrs at rate of Rs 3.90 per unit. What is ' per unit' please solve it sir / ma'am.

Glass and water have a reflective index of 1.52 and 1.34 respectively. What is the refractive index of glass with respect to water? How much time will light take to pass through hypothetical tube of 40,000 km half filled with water and other half filled with glass. Take C = 3×108 m/s .

The sensation of seeing an object remains for about _____ of a second after the object is removed from the view.

Nowadays we are using alternate or non-conventional sources of energy more. Why?

What is potential drop? Why does it happen?

For passengers flying at very high altitude, sky appears dark. Why?

The fuel which is not obtained from biomass is : (a) firewood (b) cow-dung cakes (c) coke (d) charcoal

The refractive index of glass is 32. Speed of light in glass would be

A diverging lens of focal length 20 cm and a converging lens of focal length 30 cm are placed 15 cm apart with their principal axes coinciding. Where should an object be placed on the principal axis so that its image is formed at infinity ?

Why is it necessary to have an earth wire installed in a power circuit, but not in a lighting circuit?

Real and virtual image where does real image form plane ,concave ,convex mirror and how?

How placing an iron core in a solenoid can increase the strength of an electromagnet?

Neutrons are made up of one up quark and two down quarks and the quarks have chare..... So why neutrons do not have charge ?

A concave mirror having a radius of curvature 40 cm is placed in front of an illuminated point source at a distance of 30 cm from it. Find the location of the image.

What is kreb cycle?

The insulator of electricity is : (a) copper (b) acidulated water (c) human body (d) silk

What are the sign conventions for loop law and can you please give an example for loop law and explain it.

In some states, the purest form of rainwater is known as

The value of angular magnification if the final image is formed at near point, instead of infinity is .

what is zeeman effect? what is stark effect?

Name a piece of apparatus other than plane mirror, which can be used to turn a ray of light through 90 degree ? Do I need to specify the type of prism used(the isosceles prism) ?

Name the phenomenon due to which afterimage persists for a fraction of second.

To determine focal length of a concave mirror a student obtains the image of a well lit distant object on a screen. To determine the focal length of the given concave mirror he needs to measures the distance between:

Wind flows because of which of the following reason?

Find the critical angle for a ray of light travelling from glass to air. [μg = √2 , μa = 1]

When electrons in a conductor flow from their atoms , does the composition or properties of the element's atom change ?

A motor converts one form of energy into another. Name the two forms.

During the emission of a beta particle, the quantity that remains the same is

Why is biogas considered an ideal fuel for domestic use ?

Which of the following metal is not attracted by a magnet?

Prove that Refractive index = real depthapparent depth

A skydiver weighing 60 kg moves through a distance of 40 m upwards in 2 seconds. The power spent by the skydiver due to its weight (in Watt) is ___ . Take g =9.8 m/s2

A truck has a mass of 1600 kg. If the truck has to be stopped with a negative acceleration of 1.8 ms-2. What is the force of friction between the truck and the road? (Give your answer in N) ___

Choose the word which best fills the blank from the four options given. I caught a ___ of him in the crowd for a fleeting moment before he disappeared.

Match the electron shells with the corresponding number of electrons present.

A rod PQ of mass M and length L is hinged at end P. The rod is kept horizontal by a massless string tied to point Q as shown in figure. When string is cut, the initial angular acceleration of the rod is

Find the distance (u) of an object, of height ho=5 cm from the optical centre of a concave lens, so that its image is formed 15 cm away from lens? Also, find the size of the image (hi)? Focal length of concave lens, f=30 cm.

The frequency of a source of sound is 100 Hz. The number of sound wave produced in one minute is

Name the part of our eyes which helps us to focus near and distant objects in quick succession.

For a current in a long straight solenoid, N and S poles are created at the two ends. Among the following statements, the incorrect statement is:

Explain Domestic electric circuit.

If lens I has a focal length of + 15 cm and lens II has a focal length of + 30 cm. Which lens has more power?