16569 + Interview Questions in Physics

1.	A bucket contains 8 kg of water at 25∘C and 2 kg of water at 80∘C is poured into it. Neglecting the heat absorbed by the bucket, calculate the final temperature of water.
Answer» A bucket contains $8 kg$ of water at $25^{\circ} C$ and $2 kg$ of water at $80^{\circ} C$ is poured into it. Neglecting the heat absorbed by the bucket, calculate the final temperature of water.

Discussion

2.	An object of height h0=1 cm is moved along principal axis of a convex lens of focal length f=10 cm.Figure shows variation of magnitude of height of image with image distance (v). Find v2−v1 in cm_______.
Answer» An object of height $h_{0} = 1 cm$ is moved along principal axis of a convex lens of focal length $f = 10 cm$ .Figure shows variation of magnitude of height of image with image distance (v). Find $v_{2} - v_{1}$ in $c m$ _______.

Discussion

3.	Is there any image formed by parallel rays?
Answer» Is there any image formed by parallel rays?

Discussion

4.	47. Establish the relation for the frequency of vibration for a stretched string of length (l),linear mass density m and tension in the string
Answer» 47. Establish the relation for the frequency of vibration for a stretched string of length (l),linear mass density m and tension in the string

Discussion

5.	Lenz’s law is a consequence of the law of conservations of :
Answer» Lenz’s law is a consequence of the law of conservations of :

Discussion

6.	What is a spherical mirror ? Distinguish between a concave mirror and a convex mirror.
Answer» What is a spherical mirror ? Distinguish between a concave mirror and a convex mirror.

Discussion

7.	A thick plane mirror shows a number of images of the filament of an electric bulb .of these ,the brightest image is a) first b)second c) third d) fourth
Answer» A thick plane mirror shows a number of images of the filament of an electric bulb .of these ,the brightest image is a) first b)second c) third d) fourth

Discussion

8.	Why does a rectangular glass slab shows only refraction of light and not dispersion?
Answer» Why does a rectangular glass slab shows only refraction of light and not dispersion?

Discussion

9.	2)Suppose you have two fuses of rating 5 A and 15 A .What will be the rating of the combination if they are connected 1)in series 2) in parallel?
Answer» 2)Suppose you have two fuses of rating 5 A and 15 A .What will be the rating of the combination if they are connected 1)in series 2) in parallel?

Discussion

10.	How do you measure the relative strength of magnetic fields generated by two current carrying coil?
Answer» How do you measure the relative strength of magnetic fields generated by two current carrying coil?

Discussion

11.	Question 27Give some examples of Tyndall effect observed in your surroundings?
Answer» Question 27 Give some examples of Tyndall effect observed in your surroundings?

Discussion

12.	A uniform meter scale is kept in equilibrium when supported at the 60cm mark and a mass M is suspended from the 90cm mark as shown in the figure. Which of the following is true?
Answer» A uniform meter scale is kept in equilibrium when supported at the 60cm mark and a mass M is suspended from the 90cm mark as shown in the figure. Which of the following is true?

12.

A uniform meter scale is kept in equilibrium when supported at the 60cm mark and a mass M is suspended from the 90cm mark as shown in the figure. Which of the following is true?

Answer»

A uniform meter scale is kept in equilibrium when supported at the 60cm mark and a mass M is suspended from the 90cm mark as shown in the figure. Which of the following is true?

Discussion

13.	why for a short thin solenoid the magnetic field at the end is unI/2 and at the centre is unI
Answer» why for a short thin solenoid the magnetic field at the end is unI/2 and at the centre is unI

Discussion

14.	An L−R circuit has L=1 H and R=2 Ω. It is connected across an emf of 2 V at t=0. Find the rate of change of current in the circuit at t=100 ms. (e1/5=1.22)
Answer» An $L - R$ circuit has $L = 1 H$ and $R = 2 Ω$ . It is connected across an emf of $2 V$ at $t = 0$ . Find the rate of change of current in the circuit at $t = 100 ms .$ $(e^{1 / 5} = 1.22)$

Discussion

15.	What is line integral in ampere circuital law?
Answer» What is line integral in ampere circuital law?

Discussion

16.	if the change in the value of 'g' at the height 'h' above the surface of the surface of the earth is same as at a depth X below it then (X and h being than much smaller than the radius of the earth
Answer» if the change in the value of 'g' at the height 'h' above the surface of the surface of the earth is same as at a depth X below it then (X and h being than much smaller than the radius of the earth

Discussion

17.	56. The angle of polarization for any medium is 60 degree. What will be it's critical angle for this ??
Answer» 56. The angle of polarization for any medium is 60 degree. What will be it's critical angle for this ??

Discussion

18.	Current through wire XY of circuit shown is
Answer» Current through wire $XY$ of circuit shown is

Discussion

19.	What is charging and dis charging of a battery how does it work
Answer» What is charging and dis charging of a battery how does it work

Discussion

20.	Explain why, two magnetic field lines do not intersect each other.
Answer» Explain why, two magnetic field lines do not intersect each other.

Discussion

21.	4. The radius of the nearly circular orbit of mercury is 5.8 x 1010 m and its orbital period is88 days. If a hypothetical planet has an orbital period of 55 days, what is the radius of itscircular orbit?Hint : By Kepler's third law.
Answer» 4. The radius of the nearly circular orbit of mercury is 5.8 x 1010 m and its orbital period is88 days. If a hypothetical planet has an orbital period of 55 days, what is the radius of itscircular orbit?Hint : By Kepler's third law.

Discussion

22.	A long conducting wire carrying a current I is bend at 120 degrees ,the magnetic field at a point P on the angle bisector of bending angle at a dis†an ce d from the bend i
Answer» A long conducting wire carrying a current I is bend at 120 degrees ,the magnetic field at a point P on the angle bisector of bending angle at a dis†an ce d from the bend i

Discussion

23.	Convert the temperature of 276 K to the celsius scale.
Answer» Convert the temperature of $276 K$ to the celsius scale.

Discussion

24.	Question 2(b) Verify that a÷(b+c)≠(a÷b)+(a÷c) for each of the following values of a, b and c. a = (- 10), b = 1, c = 1
Answer» Question 2(b) Verify that $a \div (b + c) \neq (a \div b) + (a \div c)$ for each of the following values of a, b and c. a = (- 10), b = 1, c = 1

Discussion

25.	In a Fresnel's biprism experiment, 2 position of lens give seperation between slits as 16cm and 9 cm resp. What's the actual distance of seperation? (1) 13cm (2) 14cm (3) 12.5 cm (4) 12 cm
Answer» In a Fresnel's biprism experiment, 2 position of lens give seperation between slits as 16cm and 9 cm resp. What's the actual distance of seperation? (1) 13cm (2) 14cm (3) 12.5 cm (4) 12 cm

Discussion

26.	A force tends to rotate a body about any axis if
Answer» A force tends to rotate a body about any axis if

Discussion

27.	1.Derive the formulas related to resonance tube.2.What is end correction? Derive its formula also.3.What do we mean by a) resonanceb) normal mode of vibration
Answer» 1.Derive the formulas related to resonance tube. 2.What is end correction? Derive its formula also. 3.What do we mean by a) resonance b) normal mode of vibration

Discussion

28.	A ray of light is going from air to glass such that the reflected light is found to be completely plane polarized. Also, the angle of refraction inside the glass is found exactly equal to the angle of deviation suffered by the ray. The refractive index of the glass is
Answer» A ray of light is going from air to glass such that the reflected light is found to be completely plane polarized. Also, the angle of refraction inside the glass is found exactly equal to the angle of deviation suffered by the ray. The refractive index of the glass is

Discussion

29.	The gravitational field in a region is given by E= 5i+12j N/Kg, then the magnitude of the gravitational force acting on a particle of mass 2 kg placed at the origin, will be1. Zero2. 13N3. 26N4. 75N
Answer» The gravitational field in a region is given by E= 5i+12j N/Kg, then the magnitude of the gravitational force acting on a particle of mass 2 kg placed at the origin, will be 1. Zero 2. 13N 3. 26N 4. 75N

Discussion

30.	If the distance between the sun and the earth is increased to three times then the attraction between the two will change by how much percentage?
Answer» If the distance between the sun and the earth is increased to three times then the attraction between the two will change by how much percentage?

Discussion

31.	79. THE PLANE FACE OF TWO IDENTICAL PLANO CONVEX LENS, EACH HAVING FOCAL LENGTH OF 40 CM ARE PLACED AGAINST EACH OTHER TO FPRM USUAL CONVEX LENS. THE DISTANCE FROM THIS LENS AT WHICH AN OBJECT MUST BE PLACED TO OBTAIN A REAL INVERTED IMAGE WITH MAGNIFICATION ''-1'' IS
Answer» 79. THE PLANE FACE OF TWO IDENTICAL PLANO CONVEX LENS, EACH HAVING FOCAL LENGTH OF 40 CM ARE PLACED AGAINST EACH OTHER TO FPRM USUAL CONVEX LENS. THE DISTANCE FROM THIS LENS AT WHICH AN OBJECT MUST BE PLACED TO OBTAIN A REAL INVERTED IMAGE WITH MAGNIFICATION ''-1'' IS

Discussion

32.	You are trying to study the flight of humming birds. For this, you make a setup such that you look through a camera at the image of a humming tree in a plane mirror. The camera is 4.30 m in front of the mirror. The bird is at camera level, 5.00 m to your right and 3.30 m from the mirror. How far will you see the image of the bird in the mirror? Refer to the diagram below. (Also, assume your eye is very very close to the camera)
Answer» You are trying to study the flight of humming birds. For this, you make a setup such that you look through a camera at the image of a humming tree in a plane mirror. The camera is 4.30 m in front of the mirror. The bird is at camera level, 5.00 m to your right and 3.30 m from the mirror. How far will you see the image of the bird in the mirror? Refer to the diagram below. (Also, assume your eye is very very close to the camera)

Discussion

33.	25.A cell of emf E and unknown internal resistance produces same amount of heat in time t when connected across two resistances R1 and R2 individually .Find internal resistance in terms of R1 and R2
Answer» 25.A cell of emf E and unknown internal resistance produces same amount of heat in time t when connected across two resistances R1 and R2 individually .Find internal resistance in terms of R1 and R2

Discussion

34.	If a person switches off all the electrical appliances in his house before leaving outside, what method of resource conservation is he practicing? __
Answer» If a person switches off all the electrical appliances in his house before leaving outside, what method of resource conservation is he practicing? __

Discussion

35.	Question 1What does an electric circuit mean?
Answer» Question 1 What does an electric circuit mean?

Discussion

36.	2.When the intensity of magnetic field is increased four times, the time-period of suspended magnetic needle becomes (1) double (2) half (3) four times (4) one-fourth less
Answer» 2.When the intensity of magnetic field is increased four times, the time-period of suspended magnetic needle becomes (1) double (2) half (3) four times (4) one-fourth less

Discussion

37.	A lady cannot see objects closer than 40 cm from the left eye and closer than 100 cm from the right eye. On a mountaineering trip, she is lost from her team. She tries to make an astronomical telescope from her reading glass. What is the magnification of this telescope for a relaxed eye?
Answer» A lady cannot see objects closer than $40 cm$ from the left eye and closer than $100 cm$ from the right eye. On a mountaineering trip, she is lost from her team. She tries to make an astronomical telescope from her reading glass. What is the magnification of this telescope for a relaxed eye?

Discussion

38.	How to decide sign of any curvature of lenses
Answer» How to decide sign of any curvature of lenses

Discussion

39.	In figure showwn below , all the diodes are ideal.The value of current I is ___ mA.4
Answer» In figure showwn below , all the diodes are ideal. The value of current I is ___ mA. 4

Discussion

40.	The amplitude of the sound waves determines?
Answer» The amplitude of the sound waves determines?

Discussion

41.	What is a machine? Can our body parts act as machines?
Answer» What is a machine? Can our body parts act as machines?

Discussion

42.	A ray of light is incident on a plane mirror at an angle of 30∘. What is the angle of reflection?
Answer» A ray of light is incident on a plane mirror at an angle of $30^{\circ}$ . What is the angle of reflection?

Discussion

43.	A rectangular tank of depth 8 metres is full of water μ=43 then, the bottom is seen at a depth of___metres.
Answer» A rectangular tank of depth $8$ metres is full of water $μ = \frac{4}{3}$ then, the bottom is seen at a depth of___metres.

Discussion

44.	All the resistance given below are of 1Ω. Find the value of I ?
Answer» All the resistance given below are of $1 Ω$ . Find the value of I ?

44.

All the resistance given below are of 1Ω. Find the value of I ?

Answer»

All the resistance given below are of $1 Ω$ . Find the value of I ?

Discussion

45.	17.find effective resistance between terminal a and b
Answer» 17.find effective resistance between terminal a and b

Discussion

46.	What is charging by conduction
Answer» What is charging by conduction

Discussion

47.	Name the phenomenon which is made use of in an electric generator.
Answer» Name the phenomenon which is made use of in an electric generator.

Discussion

48.	OA is an object with image size 4 cm and O'A' is the image of the object. Find the image height and nature of the image formed.
Answer» OA is an object with image size 4 cm and O'A' is the image of the object. Find the image height and nature of the image formed.

Discussion

49.	What is the effect of an increase in pressure on the boiling point of a liquid?
Answer» What is the effect of an increase in pressure on the boiling point of a liquid?

49.

What is the effect of an increase in pressure on the boiling point of a liquid?

Answer»

What is the effect of an increase in pressure on the boiling point of a liquid?

Discussion

50.	where is series and parallel combination used?
Answer» where is series and parallel combination used?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A bucket contains 8 kg of water at 25∘C and 2 kg of water at 80∘C is poured into it. Neglecting the heat absorbed by the bucket, calculate the final temperature of water.

An object of height h0=1 cm is moved along principal axis of a convex lens of focal length f=10 cm.Figure shows variation of magnitude of height of image with image distance (v). Find v2−v1 in cm_______.

Is there any image formed by parallel rays?

47. Establish the relation for the frequency of vibration for a stretched string of length (l),linear mass density m and tension in the string

Lenz’s law is a consequence of the law of conservations of :

What is a spherical mirror ? Distinguish between a concave mirror and a convex mirror.

A thick plane mirror shows a number of images of the filament of an electric bulb .of these ,the brightest image is a) first b)second c) third d) fourth

Why does a rectangular glass slab shows only refraction of light and not dispersion?

2)Suppose you have two fuses of rating 5 A and 15 A .What will be the rating of the combination if they are connected 1)in series 2) in parallel?

How do you measure the relative strength of magnetic fields generated by two current carrying coil?

Question 27Give some examples of Tyndall effect observed in your surroundings?

A uniform meter scale is kept in equilibrium when supported at the 60cm mark and a mass M is suspended from the 90cm mark as shown in the figure. Which of the following is true?

why for a short thin solenoid the magnetic field at the end is unI/2 and at the centre is unI

An L−R circuit has L=1 H and R=2 Ω. It is connected across an emf of 2 V at t=0. Find the rate of change of current in the circuit at t=100 ms. (e1/5=1.22)

What is line integral in ampere circuital law?

if the change in the value of 'g' at the height 'h' above the surface of the surface of the earth is same as at a depth X below it then (X and h being than much smaller than the radius of the earth

56. The angle of polarization for any medium is 60 degree. What will be it's critical angle for this ??

Current through wire XY of circuit shown is

What is charging and dis charging of a battery how does it work

Explain why, two magnetic field lines do not intersect each other.

4. The radius of the nearly circular orbit of mercury is 5.8 x 1010 m and its orbital period is88 days. If a hypothetical planet has an orbital period of 55 days, what is the radius of itscircular orbit?Hint : By Kepler's third law.

A long conducting wire carrying a current I is bend at 120 degrees ,the magnetic field at a point P on the angle bisector of bending angle at a dis†an ce d from the bend i

Convert the temperature of 276 K to the celsius scale.

Question 2(b) Verify that a÷(b+c)≠(a÷b)+(a÷c) for each of the following values of a, b and c. a = (- 10), b = 1, c = 1

In a Fresnel's biprism experiment, 2 position of lens give seperation between slits as 16cm and 9 cm resp. What's the actual distance of seperation? (1) 13cm (2) 14cm (3) 12.5 cm (4) 12 cm

A force tends to rotate a body about any axis if

1.Derive the formulas related to resonance tube.2.What is end correction? Derive its formula also.3.What do we mean by a) resonanceb) normal mode of vibration

A ray of light is going from air to glass such that the reflected light is found to be completely plane polarized. Also, the angle of refraction inside the glass is found exactly equal to the angle of deviation suffered by the ray. The refractive index of the glass is

The gravitational field in a region is given by E= 5i+12j N/Kg, then the magnitude of the gravitational force acting on a particle of mass 2 kg placed at the origin, will be1. Zero2. 13N3. 26N4. 75N

If the distance between the sun and the earth is increased to three times then the attraction between the two will change by how much percentage?

79. THE PLANE FACE OF TWO IDENTICAL PLANO CONVEX LENS, EACH HAVING FOCAL LENGTH OF 40 CM ARE PLACED AGAINST EACH OTHER TO FPRM USUAL CONVEX LENS. THE DISTANCE FROM THIS LENS AT WHICH AN OBJECT MUST BE PLACED TO OBTAIN A REAL INVERTED IMAGE WITH MAGNIFICATION ''-1'' IS

25.A cell of emf E and unknown internal resistance produces same amount of heat in time t when connected across two resistances R1 and R2 individually .Find internal resistance in terms of R1 and R2

If a person switches off all the electrical appliances in his house before leaving outside, what method of resource conservation is he practicing? __

Question 1What does an electric circuit mean?

2.When the intensity of magnetic field is increased four times, the time-period of suspended magnetic needle becomes (1) double (2) half (3) four times (4) one-fourth less

A lady cannot see objects closer than 40 cm from the left eye and closer than 100 cm from the right eye. On a mountaineering trip, she is lost from her team. She tries to make an astronomical telescope from her reading glass. What is the magnification of this telescope for a relaxed eye?

How to decide sign of any curvature of lenses

In figure showwn below , all the diodes are ideal.The value of current I is ___ mA.4

The amplitude of the sound waves determines?

What is a machine? Can our body parts act as machines?

A ray of light is incident on a plane mirror at an angle of 30∘. What is the angle of reflection?

A rectangular tank of depth 8 metres is full of water μ=43 then, the bottom is seen at a depth of___metres.

All the resistance given below are of 1Ω. Find the value of I ?

17.find effective resistance between terminal a and b

What is charging by conduction

Name the phenomenon which is made use of in an electric generator.

OA is an object with image size 4 cm and O'A' is the image of the object. Find the image height and nature of the image formed.

What is the effect of an increase in pressure on the boiling point of a liquid?

where is series and parallel combination used?