16569 + Interview Questions in Physics

1.	Derek was giving electricity exam and one of the questions was “Three resistors of resistance 4Ω, 8Ω and 12Ω are connected in parallel. Find the equivalent resistance.” He calculated using the formula and got the answer as 6Ω. He immediately knew that he did some mistake in the calculation. How could he possibly know that?
Answer» Derek was giving electricity exam and one of the questions was “Three resistors of resistance 4Ω, 8Ω and 12Ω are connected in parallel. Find the equivalent resistance.” He calculated using the formula and got the answer as 6Ω. He immediately knew that he did some mistake in the calculation. How could he possibly know that?

Discussion

2.	Find the incorrect match in the table for spherical mirrors. Position ofPosition ofSize of imageNature ofthe objectthe imagethe image
Answer» Find the incorrect match in the table for spherical mirrors. $\begin{matrix} Position of & Position of & Size of image & Nature of the object & the image & the image \end{matrix}$

Discussion

3.	What is the difference between steam and gas?
Answer» What is the difference between steam and gas?

Discussion

4.	Question 2 Name some sources of direct current.
Answer» Question 2 Name some sources of direct current.

Discussion

5.	What is the difference between resistance and resistivity in terms of definition ? i.e. resistance is defined as the property of conductor due to which it opposes the flow of electric current through it. Then how can we define resistivity in a similar way ?
Answer» What is the difference between resistance and resistivity in terms of definition ? i.e. resistance is defined as the property of conductor due to which it opposes the flow of electric current through it. Then how can we define resistivity in a similar way ?

5.

What is the difference between resistance and resistivity in terms of definition ? i.e. resistance is defined as the property of conductor due to which it opposes the flow of electric current through it. Then how can we define resistivity in a similar way ?

Answer»

What is the difference between resistance and resistivity in terms of definition ?

i.e. resistance is defined as the property of conductor due to which it opposes the flow of electric current through it.

Then how can we define resistivity in a similar way ?

Discussion

6.	The critical angle for a light travelling from denser to rarer medium is defined as the angle of incidence at which the light refracts at 90∘(angle of refraction). If a ray of light travels from water ( μw) to air ( μa), find the critical angle.
Answer» The critical angle for a light travelling from denser to rarer medium is defined as the angle of incidence at which the light refracts at $90^{\circ}$ (angle of refraction). If a ray of light travels from water ( $μ_{w}$ ) to air ( $μ_{a}$ ), find the critical angle.

Discussion

7.	What is meant by 'reflection of light'? Define the following terms used in the study of reflection of light by drawing a labelled ray-diagram : (a) Incident ray (b) Reflected ray (c) Point of incidence (d) Normal (e) Angle of incidence (f) Angle of reflection
Answer» What is meant by 'reflection of light'? Define the following terms used in the study of reflection of light by drawing a labelled ray-diagram : (a) Incident ray (b) Reflected ray (c) Point of incidence (d) Normal (e) Angle of incidence (f) Angle of reflection

Discussion

8.	A screw gauge with a least count of 0.01 mm is used to measure the diameter of a lead shot. The reading on the pitch scale is found to be 1 mm and the reading on the head scale is 20 divisions. If the screw gauge has a zero error of +0.05 mm, what is the volume of the lead shot?
Answer» A screw gauge with a least count of 0.01 mm is used to measure the diameter of a lead shot. The reading on the pitch scale is found to be 1 mm and the reading on the head scale is 20 divisions. If the screw gauge has a zero error of +0.05 mm, what is the volume of the lead shot?

Discussion

9.	Which of the following is/are the form of Mechanical energy?
Answer» Which of the following is/are the form of Mechanical energy?

Discussion

10.	The minimum speed needed for an object to escape from the gravitational influence of the earth is:
Answer» The minimum speed needed for an object to escape from the gravitational influence of the earth is:

Discussion

11.	State one way to obtain a greater moment of a force about a given axis of rotation.
Answer» State one way to obtain a greater moment of a force about a given axis of rotation.

Discussion

12.	In the given figure, A, B and C are three ammeters. The ammeter ‘B’ reads 0.5 A. (All the ammeters have negligible resistance): Total resistance of the circuit is:
Answer» In the given figure, A, B and C are three ammeters. The ammeter ‘B’ reads 0.5 A. (All the ammeters have negligible resistance): Total resistance of the circuit is:

12.

In the given figure, A, B and C are three ammeters. The ammeter ‘B’ reads 0.5 A. (All the ammeters have negligible resistance): Total resistance of the circuit is:

Answer»

In the given figure, A, B and C are three ammeters. The ammeter ‘B’ reads 0.5 A. (All the ammeters have negligible resistance):

Total resistance of the circuit is:

Discussion

13.	The radioactive radiations which have the least penetrating power.
Answer» The radioactive radiations which have the least penetrating power.

Discussion

14.	If a compass is kept exactly between the north poles of 2 similar bar magnets, then in which direction will its needle get deflected to?
Answer» If a compass is kept exactly between the north poles of 2 similar bar magnets, then in which direction will its needle get deflected to?

14.

If a compass is kept exactly between the north poles of 2 similar bar magnets, then in which direction will its needle get deflected to?

Answer»

If a compass is kept exactly between the north poles of 2 similar bar magnets, then in which direction will its needle get deflected to?

Discussion

15.	State whether the following statement is true or false. If the angle of incidence is greater than the critical angle, light is not refracted at all, when it falls on the surface from a denser medium to a rarer medium.
Answer» State whether the following statement is true or false. If the angle of incidence is greater than the critical angle, light is not refracted at all, when it falls on the surface from a denser medium to a rarer medium.

Discussion

16.	n electrons flow through a cross section of a conductor in time t. If charge on an electron is e, write an expression for the currrent in the conductor.
Answer» n electrons flow through a cross section of a conductor in time t. If charge on an electron is e, write an expression for the currrent in the conductor.

Discussion

17.	Which of the following shows the characteristics of mechanical waves?
Answer» Which of the following shows the characteristics of mechanical waves?

Discussion

18.	The sky appears blue because some of the blue component of sunlight is scattered by : (a) gas molecules present in air (b) dust particles present in air (c) water droplets suspended in air (d) soot particles present in air
Answer» The sky appears blue because some of the blue component of sunlight is scattered by : (a) gas molecules present in air (b) dust particles present in air (c) water droplets suspended in air (d) soot particles present in air

Discussion

19.	Steam at 100oC is passed into 1.1 kg of water contained in a calorimeter of water equivalent 0.02 kg at 15oC till the temperature of the calorimeter and its contents rises to 80oC. The mass of the steam condensed in kg is
Answer» Steam at $100^{o} C$ is passed into 1.1 kg of water contained in a calorimeter of water equivalent 0.02 kg at $15^{o} C$ till the temperature of the calorimeter and its contents rises to $80^{o} C .$ The mass of the steam condensed in kg is

Discussion

20.	Define Optical Center
Answer» Define Optical Center

Discussion

21.	Calculate the equivalent resistance between the points A and B in the figure if each resistance is 2.0Ω.
Answer» Calculate the equivalent resistance between the points A and B in the figure if each resistance is $2.0 Ω$ .

Discussion

22.	Explain the statement the potential difference between two points is 1 volt'
Answer» Explain the statement the potential difference between two points is 1 volt'

Discussion

23.	What is a dynamo? On what principle does it work?
Answer» What is a dynamo? On what principle does it work?

Discussion

24.	If you are looking at the moon, then what happens to your ciliary muscles?
Answer» If you are looking at the moon, then what happens to your ciliary muscles?

Discussion

25.	If 100 J is the energy required for an appliance to run per second, then what is the power consumed by it in watts, if it operates at 220V?
Answer» If 100 J is the energy required for an appliance to run per second, then what is the power consumed by it in watts, if it operates at 220V?

Discussion

26.	Can a charged material apply force on a neutral material
Answer» Can a charged material apply force on a neutral material

Discussion

27.	Question: A heavy and a light body have equal momentum. Which of the following has greater kinetic energy ... A body at ground level will have which energy?
Answer» Question: A heavy and a light body have equal momentum. Which of the following has greater kinetic energy ... A body at ground level will have which energy?

27.

Question: A heavy and a light body have equal momentum. Which of the following has greater kinetic energy ... A body at ground level will have which energy?

Answer»

Question: A heavy and a light body have equal momentum. Which of the following has greater kinetic energy

... A body at ground level will have which energy?

Discussion

28.	An object is placed 20 cm in front of a plane mirror. The mirror is moved 2 cm towards the object. The distance between the positions of the original and final images seen in the mirror is : (a) 2 cm (b) 4 cm (c) 10 cm (d) 22 cm
Answer» An object is placed 20 cm in front of a plane mirror. The mirror is moved 2 cm towards the object. The distance between the positions of the original and final images seen in the mirror is : (a) 2 cm (b) 4 cm (c) 10 cm (d) 22 cm

Discussion

29.	An object is placed in front of a converging lens at a distance greater than twice the focal length of the lens. The image obtained is:
Answer» An object is placed in front of a converging lens at a distance greater than twice the focal length of the lens. The image obtained is:

Discussion

30.	After testing the eyes of a child, the optician has prescribed the following lenses for his spectacles : Left eye : 2.00 D Right eye : + 2.25 D The child is suffering from the defect of vision called : (a) short-sightedness (b) long-sightedness (c) cataract (d) prsbyopia
Answer» After testing the eyes of a child, the optician has prescribed the following lenses for his spectacles : Left eye : 2.00 D Right eye : + 2.25 D The child is suffering from the defect of vision called : (a) short-sightedness (b) long-sightedness (c) cataract (d) prsbyopia

Discussion

31.	State the changes in the position, size and nature of the image when the object is broght from infinity up to the concave lens. Illustrate your answer by drawing the ray diagrams.
Answer» State the changes in the position, size and nature of the image when the object is broght from infinity up to the concave lens. Illustrate your answer by drawing the ray diagrams.

Discussion

32.	Which has more heat: 1 g of ice at 0o C or 1 g of water at 0o C ? Give reason.
Answer» Which has more heat: 1 g of ice at $0^{o} C o r 1 g$ of water at $0^{o} C$ ? Give reason.

32.

Which has more heat: 1 g of ice at 0o C or 1 g of water at 0o C ? Give reason.

Answer»

Which has more heat: 1 g of ice at $0^{o} C o r 1 g$ of water at $0^{o} C$ ? Give reason.

Discussion

33.	________ is a consequence of Simple Harmonic Motion .
Answer» ________ is a consequence of Simple Harmonic Motion .

Discussion

34.	When to take magnification, image height, object height positive and negative?
Answer» When to take magnification, image height, object height positive and negative?

Discussion

35.	Name the mirror which can give : (a) an erect and enlarged image of an object. (b) an erect and diminished image of an object.
Answer» Name the mirror which can give : (a) an erect and enlarged image of an object. (b) an erect and diminished image of an object.

Discussion

36.	Three resistors each of 2Ω are connected together so that their total resistance is 3Ω. Draw a diagram to show this arrangement and check it by calculation.
Answer» Three resistors each of $2 Ω$ are connected together so that their total resistance is $3 Ω$ . Draw a diagram to show this arrangement and check it by calculation.

Discussion

37.	The magnitude of the maximum disturbance in the medium on either side of the mean value is called____.
Answer» The magnitude of the maximum disturbance in the medium on either side of the mean value is called____.

Discussion

38.	Explain Direct and Alternating current.
Answer» Explain Direct and Alternating current.

Discussion

39.	Which of the following is the correct relation between frequency (f), speed (C) and wavelength (λ) of an electromagnetic radiation?
Answer» Which of the following is the correct relation between frequency (f), speed (C) and wavelength $(λ)$ of an electromagnetic radiation?

Discussion

40.	Explain Total internal relfection.
Answer» Explain Total internal relfection.

Discussion

41.	A block and tackle system have the velocity ratio 3. A man can exert a pull of 200 kgf. What is the maximum load he can raise with this pulley system if its efficiency is 50%?
Answer» A block and tackle system have the velocity ratio 3. A man can exert a pull of 200 kgf. What is the maximum load he can raise with this pulley system if its efficiency is 50%?

41.

A block and tackle system have the velocity ratio 3. A man can exert a pull of 200 kgf. What is the maximum load he can raise with this pulley system if its efficiency is 50%?

Answer»

A block and tackle system have the velocity ratio 3. A man can exert a pull of 200 kgf. What is the maximum load he can raise with this pulley system if its efficiency is 50%?

Discussion

42.	How priestly lightened the candle without touching the belljar
Answer» How priestly lightened the candle without touching the belljar

Discussion

43.	When does thermal conduction take place?
Answer» When does thermal conduction take place?

Discussion

44.	What is contact and non-contact forces?
Answer» What is contact and non-contact forces?

Discussion

45.	The above diagram shows the arrangement for observing the scattering of light in the colloidal solution. Why does the beaker appear orangish-red when it is seen through the slit MN?
Answer» The above diagram shows the arrangement for observing the scattering of light in the colloidal solution. Why does the beaker appear orangish-red when it is seen through the slit MN?

45.

The above diagram shows the arrangement for observing the scattering of light in the colloidal solution. Why does the beaker appear orangish-red when it is seen through the slit MN?

Answer»

The above diagram shows the arrangement for observing the scattering of light in the colloidal solution. Why does the beaker appear orangish-red when it is seen through the slit MN?

Discussion

46.	In making decisions about important questions, it is desirable to be able to distinguish between 'strong' arguments and 'weak' arguments. 'Strong' arguments must be both important and directly related to the question. 'Weak' arguments may not be directly related to the question and may be of minor importance or may be related to the trivial aspects of the question. Each question below is followed by arguments numbered I, II, III, IV. Decide which of the arguments are 'strong' arguments and which are 'weak' arguments ? Statement: Should the rule of wearing a helmet for both driver and pillion rider while driving a motor bike be enforced strictly? Arguments: I. Yes, it is a rule and should be followed strictly by all. II. No, each individual knows how to protect his own life and it should be left to this discretion. III. No, it does not ensure safety as only the head is protected and rest of the body is not. IV. Yes, it is a necessity as head, being the most sensitive organ, is protected by the helmet.
Answer» In making decisions about important questions, it is desirable to be able to distinguish between 'strong' arguments and 'weak' arguments. 'Strong' arguments must be both important and directly related to the question. 'Weak' arguments may not be directly related to the question and may be of minor importance or may be related to the trivial aspects of the question. Each question below is followed by arguments numbered I, II, III, IV. Decide which of the arguments are 'strong' arguments and which are 'weak' arguments ? Statement: Should the rule of wearing a helmet for both driver and pillion rider while driving a motor bike be enforced strictly? Arguments: I. Yes, it is a rule and should be followed strictly by all. II. No, each individual knows how to protect his own life and it should be left to this discretion. III. No, it does not ensure safety as only the head is protected and rest of the body is not. IV. Yes, it is a necessity as head, being the most sensitive organ, is protected by the helmet.

Discussion

47.	If a conducting wire is placed along the x-axis and a current flow through it in the positive direction, it creates a magnetic field around it. Direction of the magnetic field at a point (0,-2) is
Answer» If a conducting wire is placed along the x-axis and a current flow through it in the positive direction, it creates a magnetic field around it. Direction of the magnetic field at a point (0,-2) is

Discussion

48.	A current of 0.5 A is drawn by a filament of an electric bulb for 10 minutes.Find the amount of electric current that flows through the circuit and find the elctrons
Answer» A current of 0.5 A is drawn by a filament of an electric bulb for 10 minutes.Find the amount of electric current that flows through the circuit and find the elctrons

Discussion

49.	In our eye,if the convex lens produces a inverted image on a retina then how do wee see the erect image of a person?
Answer» In our eye,if the convex lens produces a inverted image on a retina then how do wee see the erect image of a person?

Discussion

50.	Hot coffee in a thermos flask is shaken vigorously, considering it as a system which of the statement is not true?
Answer» Hot coffee in a thermos flask is shaken vigorously, considering it as a system which of the statement is not true?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Find the incorrect match in the table for spherical mirrors. Position ofPosition ofSize of imageNature ofthe objectthe imagethe image

What is the difference between steam and gas?

Question 2 Name some sources of direct current.

What is the difference between resistance and resistivity in terms of definition ? i.e. resistance is defined as the property of conductor due to which it opposes the flow of electric current through it. Then how can we define resistivity in a similar way ?

The critical angle for a light travelling from denser to rarer medium is defined as the angle of incidence at which the light refracts at 90∘​(angle of refraction). If a ray of light travels from water ( μw) to air ( μa), find the critical angle.

What is meant by 'reflection of light'? Define the following terms used in the study of reflection of light by drawing a labelled ray-diagram : (a) Incident ray (b) Reflected ray (c) Point of incidence (d) Normal (e) Angle of incidence (f) Angle of reflection

A screw gauge with a least count of 0.01 mm is used to measure the diameter of a lead shot. The reading on the pitch scale is found to be 1 mm and the reading on the head scale is 20 divisions. If the screw gauge has a zero error of +0.05 mm, what is the volume of the lead shot?

Which of the following is/are the form of Mechanical energy?

The minimum speed needed for an object to escape from the gravitational influence of the earth is:

State one way to obtain a greater moment of a force about a given axis of rotation.

In the given figure, A, B and C are three ammeters. The ammeter ‘B’ reads 0.5 A. (All the ammeters have negligible resistance): Total resistance of the circuit is:

The radioactive radiations which have the least penetrating power.

If a compass is kept exactly between the north poles of 2 similar bar magnets, then in which direction will its needle get deflected to?

State whether the following statement is true or false. If the angle of incidence is greater than the critical angle, light is not refracted at all, when it falls on the surface from a denser medium to a rarer medium.

n electrons flow through a cross section of a conductor in time t. If charge on an electron is e, write an expression for the currrent in the conductor.

Which of the following shows the characteristics of mechanical waves?

The sky appears blue because some of the blue component of sunlight is scattered by : (a) gas molecules present in air (b) dust particles present in air (c) water droplets suspended in air (d) soot particles present in air

Steam at 100oC is passed into 1.1 kg of water contained in a calorimeter of water equivalent 0.02 kg at 15oC till the temperature of the calorimeter and its contents rises to 80oC. The mass of the steam condensed in kg is

Define Optical Center

Calculate the equivalent resistance between the points A and B in the figure if each resistance is 2.0Ω.

Explain the statement the potential difference between two points is 1 volt'

What is a dynamo? On what principle does it work?

If you are looking at the moon, then what happens to your ciliary muscles?

If 100 J is the energy required for an appliance to run per second, then what is the power consumed by it in watts, if it operates at 220V?

Can a charged material apply force on a neutral material

Question: A heavy and a light body have equal momentum. Which of the following has greater kinetic energy ... A body at ground level will have which energy?

An object is placed 20 cm in front of a plane mirror. The mirror is moved 2 cm towards the object. The distance between the positions of the original and final images seen in the mirror is : (a) 2 cm (b) 4 cm (c) 10 cm (d) 22 cm

An object is placed in front of a converging lens at a distance greater than twice the focal length of the lens. The image obtained is:

After testing the eyes of a child, the optician has prescribed the following lenses for his spectacles : Left eye : 2.00 D Right eye : + 2.25 D The child is suffering from the defect of vision called : (a) short-sightedness (b) long-sightedness (c) cataract (d) prsbyopia

State the changes in the position, size and nature of the image when the object is broght from infinity up to the concave lens. Illustrate your answer by drawing the ray diagrams.

Which has more heat: 1 g of ice at 0o C or 1 g of water at 0o C ? Give reason.

________ is a consequence of Simple Harmonic Motion .

When to take magnification, image height, object height positive and negative?

Name the mirror which can give : (a) an erect and enlarged image of an object. (b) an erect and diminished image of an object.

Three resistors each of 2Ω are connected together so that their total resistance is 3Ω. Draw a diagram to show this arrangement and check it by calculation.

The magnitude of the maximum disturbance in the medium on either side of the mean value is called____.

Explain Direct and Alternating current.

Which of the following is the correct relation between frequency (f), speed (C) and wavelength (λ) of an electromagnetic radiation?

Explain Total internal relfection.

A block and tackle system have the velocity ratio 3. A man can exert a pull of 200 kgf. What is the maximum load he can raise with this pulley system if its efficiency is 50%?

How priestly lightened the candle without touching the belljar

When does thermal conduction take place?

What is contact and non-contact forces?​​​​​​

The above diagram shows the arrangement for observing the scattering of light in the colloidal solution. Why does the beaker appear orangish-red when it is seen through the slit MN?

If a conducting wire is placed along the x-axis and a current flow through it in the positive direction, it creates a magnetic field around it. Direction of the magnetic field at a point (0,-2) is

A current of 0.5 A is drawn by a filament of an electric bulb for 10 minutes.Find the amount of electric current that flows through the circuit and find the elctrons

In our eye,if the convex lens produces a inverted image on a retina then how do wee see the erect image of a person?

Hot coffee in a thermos flask is shaken vigorously, considering it as a system which of the statement is not true?

The critical angle for a light travelling from denser to rarer medium is defined as the angle of incidence at which the light refracts at 90∘(angle of refraction). If a ray of light travels from water ( μw) to air ( μa), find the critical angle.

What is contact and non-contact forces?