16569 + Interview Questions in Physics

1.	Which of the two has a greater power : a lens of short focal length or a lens of large focal length ?
Answer» Which of the two has a greater power : a lens of short focal length or a lens of large focal length ?

Discussion

2.	State Faraday's laws of electromagnetic induction.
Answer» State Faraday's laws of electromagnetic induction.

Discussion

3.	A hypothetical planet has density ρ, radius R, and surface gravitational acceleration g. If the radius of the planet is doubled, but the planetary density stayed the same, the acceleration due to gravity at the planet’s surface would be
Answer» A hypothetical planet has density $ρ$ , radius R, and surface gravitational acceleration g. If the radius of the planet is doubled, but the planetary density stayed the same, the acceleration due to gravity at the planet’s surface would be

Discussion

4.	When a boy weighing 20 kg sits at one end of a 4 m long see-saw, it gets depressed at this end. How can it be brought to the horizontal position by another boy weighing 40 kg?
Answer» When a boy weighing $20 k g$ sits at one end of a $4 m$ long see-saw, it gets depressed at this end. How can it be brought to the horizontal position by another boy weighing $40 k g$ ?

Discussion

5.	What is the meaning of the symbol kWh? Which quantity does it represent?
Answer» What is the meaning of the symbol kWh? Which quantity does it represent?

Discussion

6.	What type of energy conversion happens in an electric cell when it is connected to a circuit?
Answer» What type of energy conversion happens in an electric cell when it is connected to a circuit?

Discussion

7.	A ring of radius R is uniformly charged, and it carries a total charge Q. At a point which is at a distance of R√3 from the center and lying on the axis of the ring, electric field due to half part is E1 & due to the other half part is E2, then
Answer» A ring of radius R is uniformly charged, and it carries a total charge Q. At a point which is at a distance of $\frac{R}{\sqrt{3}}$ from the center and lying on the axis of the ring, electric field due to half part is $E_{1}$ & due to the other half part is $E_{2}$ , then

Discussion

8.	Imagine a light planet revolving around a very massive star in a circular orbit of radius R with a period of revolution T. If the gravitational force of attraction between planet and star is proportional to R−52 then T2 is proportional to
Answer» Imagine a light planet revolving around a very massive star in a circular orbit of radius R with a period of revolution T. If the gravitational force of attraction between planet and star is proportional to $R^{- \frac{5}{2}} t h e n T^{2}$ is proportional to

Discussion

9.	Calculate the combined resistance in each case:
Answer» Calculate the combined resistance in each case:

Discussion

10.	Two circular coils A and B are placed close to each other. If the current in coil A is changed, will some current be induced in the coil B? Give reason for your answer.
Answer» Two circular coils A and B are placed close to each other. If the current in coil A is changed, will some current be induced in the coil B? Give reason for your answer.

Discussion

11.	An induced current is produced when a magnet in moved into a coil. The magnitude of induced current does not depend on : (a) the speed with which the magnet is moved (b) the number of turns of th coil (c) the resistivity of the wire of the coil (d) the strength of the magnet
Answer» An induced current is produced when a magnet in moved into a coil. The magnitude of induced current does not depend on : (a) the speed with which the magnet is moved (b) the number of turns of th coil (c) the resistivity of the wire of the coil (d) the strength of the magnet

11.

An induced current is produced when a magnet in moved into a coil. The magnitude of induced current does not depend on : (a) the speed with which the magnet is moved (b) the number of turns of th coil (c) the resistivity of the wire of the coil (d) the strength of the magnet

Answer»

An induced current is produced when a magnet in moved into a coil. The magnitude of induced current does not depend on :

(a) the speed with which the magnet is moved

(b) the number of turns of th coil

(c) the resistivity of the wire of the coil

(d) the strength of the magnet

Discussion

12.	The total energy of the system is called ___ of the system.
Answer» The total energy of the system is called ___ of the system.

Discussion

13.	Question 174 A particular star is at a distance of about 8.1×1013 km from the Earth. Assuring that light travels at 3×108 m per second, find how long does light takes from that star to reach the Earth?
Answer» Question 174 A particular star is at a distance of about $8.1 \times 10^{13} k m$ from the Earth. Assuring that light travels at $3 \times 10^{8} m$ per second, find how long does light takes from that star to reach the Earth?

13.

Question 174 A particular star is at a distance of about 8.1×1013 km from the Earth. Assuring that light travels at 3×108 m per second, find how long does light takes from that star to reach the Earth?

Answer»

Question 174

A particular star is at a distance of about $8.1 \times 10^{13} k m$ from the Earth.
Assuring that light travels at $3 \times 10^{8} m$ per second, find how long does light takes from that star to reach the Earth?

Discussion

14.	Of what substance are the brushes of an electric motor made?
Answer» Of what substance are the brushes of an electric motor made?

Discussion

15.	Out of two bulbs 50W-220V and 100W-220V, which one will glow brighter:- a) when connected in series b) when connected in parallel .
Answer» Out of two bulbs 50W-220V and 100W-220V, which one will glow brighter:- a) when connected in series b) when connected in parallel .

Discussion

16.	Two conducting wires of the same material and of equal lengths and equal diameters are first connected in series and then in parallel with an electric circuit. The ratio of the heat produced in series and parallel combinations would be:
Answer» Two conducting wires of the same material and of equal lengths and equal diameters are first connected in series and then in parallel with an electric circuit. The ratio of the heat produced in series and parallel combinations would be:

Discussion

17.	The refractive index of water is 4/3 and that of glass is 3/2. Calculate the refractive index of glass with respect to water.
Answer» The refractive index of water is 4/3 and that of glass is 3/2. Calculate the refractive index of glass with respect to water.

Discussion

18.	The average temperature of the human body 37 °C. What will it be in °F?
Answer» The average temperature of the human body 37 °C. What will it be in °F?

Discussion

19.	An object is placed at a distance 2f from the pole of a convex mirror of focal length f. Then, the magnification is?
Answer» An object is placed at a distance 2f from the pole of a convex mirror of focal length f. Then, the magnification is?

Discussion

20.	Calculate the heat dissipated across 6 Ω and 4 Ω resistors in 30 seconds.
Answer» Calculate the heat dissipated across $6 Ω$ and $4 Ω$ resistors in 30 seconds.

Discussion

21.	If an object 10cm high is placed at a distance of 36 cm from a concave mirror of focal length 12cm, find the position, nature and height of image.
Answer» If an object 10cm high is placed at a distance of 36 cm from a concave mirror of focal length 12cm, find the position, nature and height of image.

Discussion

22.	What is the cause of resistance?
Answer» What is the cause of resistance?

Discussion

23.	Resistances of 6 ohm each are connected in the manner shown in adjoining figure. With the current ampere as shown in figure, the potential difference VP−VQ is
Answer» Resistances of 6 ohm each are connected in the manner shown in adjoining figure. With the current ampere as shown in figure, the potential difference $V_{P} - V_{Q}$ is

23.

Resistances of 6 ohm each are connected in the manner shown in adjoining figure. With the current ampere as shown in figure, the potential difference VP−VQ is

Answer»

Resistances of 6 ohm each are connected in the manner shown in adjoining figure. With the current ampere as shown in figure, the potential difference $V_{P} - V_{Q}$ is

Discussion

24.	If i could run at the speed of light and could vibrate at its frequency then can i pass through a glass slab as light does?
Answer» If i could run at the speed of light and could vibrate at its frequency then can i pass through a glass slab as light does?

Discussion

25.	Two exactly similar electric lamps are arranged (i) in parallel, and (ii) in series. If the parallel and series combination of lamps are connected to 220 V supply line one by one, what will be the ratio of electric power consumed by them ?
Answer» Two exactly similar electric lamps are arranged (i) in parallel, and (ii) in series. If the parallel and series combination of lamps are connected to 220 V supply line one by one, what will be the ratio of electric power consumed by them ?

Discussion

26.	What does the bulge of cornea helps in?
Answer» What does the bulge of cornea helps in?

Discussion

27.	A cut diamond sparkles because of its
Answer» A cut diamond sparkles because of its

Discussion

28.	Which of the following has the lowest wavelength?
Answer» Which of the following has the lowest wavelength?

Discussion

29.	The electrical resistance of depletion layer is large because
Answer» The electrical resistance of depletion layer is large because

Discussion

30.	What is polarization and interference of light? Please explain me in detail.
Answer» What is polarization and interference of light? Please explain me in detail.

Discussion

31.	At the time of short circuit, the current in the circuit : (a) reduces substantially (b) does not change (c) increases heavily (d) varies continuously
Answer» At the time of short circuit, the current in the circuit : (a) reduces substantially (b) does not change (c) increases heavily (d) varies continuously

31.

At the time of short circuit, the current in the circuit : (a) reduces substantially (b) does not change (c) increases heavily (d) varies continuously

Answer»

At the time of short circuit, the current in the circuit :

(a) reduces substantially (b) does not change

(c) increases heavily (d) varies continuously

Discussion

32.	'A fuse is rated 8 A'. Can it be used with an electrical appliance of rating 5 kW, 200 V ?
Answer» 'A fuse is rated 8 A'. Can it be used with an electrical appliance of rating 5 kW, 200 V ?

32.

'A fuse is rated 8 A'. Can it be used with an electrical appliance of rating 5 kW, 200 V ?

Answer»

'A fuse is rated 8 A'. Can it be used with an electrical appliance of rating 5 kW, 200 V ?

Discussion

33.	The following diagrams show the splitting up of a composite light into its constituent colours. Which among the above figures is correct?
Answer» The following diagrams show the splitting up of a composite light into its constituent colours. Which among the above figures is correct?

Discussion

34.	Complete the following sentence : Resonance is a special case of ........ vibrations, when frequency of the driving force is ........... natural frequency of the drivens body.
Answer» Complete the following sentence : Resonance is a special case of ........ vibrations, when frequency of the driving force is ........... natural frequency of the drivens body.

34.

Complete the following sentence : Resonance is a special case of ........ vibrations, when frequency of the driving force is ........... natural frequency of the drivens body.

Answer»

Complete the following sentence :

Resonance is a special case of ........ vibrations, when frequency of the driving force is ........... natural frequency of the drivens body.

Discussion

35.	In which of the following devices semiconductors are used?
Answer» In which of the following devices semiconductors are used?

Discussion

36.	Statement 1: Charcoal is a better fuel than wood. Statement 2: Charcoal burns without flames, is comparatively smokeless and has higher heat generation.
Answer» Statement 1: Charcoal is a better fuel than wood. Statement 2: Charcoal burns without flames, is comparatively smokeless and has higher heat generation.

Discussion

37.	A ray of light is incident on a medium at an angle 60°. The angle of refraction is different for different mediums for an angle of incidence = 60∘. In which medium is the speed of light lowest?
Answer» A ray of light is incident on a medium at an angle 60°. The angle of refraction is different for different mediums for an angle of incidence = 60 $^{\circ}$ . In which medium is the speed of light lowest?

37.

A ray of light is incident on a medium at an angle 60°. The angle of refraction is different for different mediums for an angle of incidence = 60∘. In which medium is the speed of light lowest?

Answer»

A ray of light is incident on a medium at an angle 60°. The angle of refraction is different for different mediums for an angle of incidence = 60 $^{\circ}$ .

In which medium is the speed of light lowest?

Discussion

38.	Where should an object be placed in front of convex lens so as to obtain the image formed on slide projector?
Answer» Where should an object be placed in front of convex lens so as to obtain the image formed on slide projector?

Discussion

39.	Vapourisation of compound is___.
Answer» Vapourisation of compound is___.

Discussion

40.	How is sunlight responsible for wind energy?
Answer» How is sunlight responsible for wind energy?

Discussion

41.	The near point of a hypermetropic eye is 1 metre What is the power of the lens required to correct this defect? (Assuming that the near point of a normal eye as 25cm)
Answer» The near point of a hypermetropic eye is 1 metre What is the power of the lens required to correct this defect? (Assuming that the near point of a normal eye as 25cm)

Discussion

42.	A resistor of 8 ohm disconnected in parallel with another resistor x. The resultant of the combination is 4.8 ohms. What is the value of resistor x
Answer» A resistor of 8 ohm disconnected in parallel with another resistor x. The resultant of the combination is 4.8 ohms. What is the value of resistor x

Discussion

43.	If you carry out an experiment to find the pattern of magnetic field lines due to a bar magnet using iron filings, you’ll find that the filings arrange themselves in nearly concentric circles with spaces between them. What is the reason for this spacing between them? Doesn’t magnetic field exist in the region between them?
Answer» If you carry out an experiment to find the pattern of magnetic field lines due to a bar magnet using iron filings, you’ll find that the filings arrange themselves in nearly concentric circles with spaces between them. What is the reason for this spacing between them? Doesn’t magnetic field exist in the region between them?

Discussion

44.	Two coils have a combined resistance of 25 ohms, when connected in series and a resistance of 4 ohms when connected in parallel. What is the resistance of each coil?
Answer» Two coils have a combined resistance of 25 ohms, when connected in series and a resistance of 4 ohms when connected in parallel. What is the resistance of each coil?

Discussion

45.	The magnetic field strength at 1, 2 and 3 in the given picture are such that:
Answer» The magnetic field strength at 1, 2 and 3 in the given picture are such that:

45.

The magnetic field strength at 1, 2 and 3 in the given picture are such that:

Answer»

The magnetic field strength at 1, 2 and 3 in the given picture are such that:

Discussion

46.	What is the optical centre of a lens?
Answer» What is the optical centre of a lens?

Discussion

47.	Where will light rays meet? Here F1 and F2 represents primary focus and secondary focus of the lens respectively
Answer» Where will light rays meet? Here $F_{1}$ and $F_{2}$ represents primary focus and secondary focus of the lens respectively

47.

Where will light rays meet? Here F1 and F2 represents primary focus and secondary focus of the lens respectively

Answer»

Where will light rays meet? Here $F_{1}$ and $F_{2}$ represents primary focus and secondary focus of the lens respectively

Discussion

48.	When a plain mirror is rotated 10° in clockwise direction and incident ray is rotated by 5° in the counterclockwise direction,by what angle will the reflected ray rotate ?
Answer» When a plain mirror is rotated 10° in clockwise direction and incident ray is rotated by 5° in the counterclockwise direction,by what angle will the reflected ray rotate ?

Discussion

49.	\N
Answer» \N

Discussion

50.	Fill in the following blank with a suitable word : A ray of light which is parallel to the principal axis of a convex mirror, appears to be coming from ___ after reflection from the mirror.
Answer» Fill in the following blank with a suitable word : A ray of light which is parallel to the principal axis of a convex mirror, appears to be coming from ___ after reflection from the mirror.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Which of the two has a greater power : a lens of short focal length or a lens of large focal length ?

State Faraday's laws of electromagnetic induction.

A hypothetical planet has density ρ, radius R, and surface gravitational acceleration g. If the radius of the planet is doubled, but the planetary density stayed the same, the acceleration due to gravity at the planet’s surface would be

When a boy weighing 20 kg sits at one end of a 4 m long see-saw, it gets depressed at this end. How can it be brought to the horizontal position by another boy weighing 40 kg?

What is the meaning of the symbol kWh? Which quantity does it represent?

What type of energy conversion happens in an electric cell when it is connected to a circuit?

A ring of radius R is uniformly charged, and it carries a total charge Q. At a point which is at a distance of R√3 from the center and lying on the axis of the ring, electric field due to half part is E1 &amp; due to the other half part is E2, then

Imagine a light planet revolving around a very massive star in a circular orbit of radius R with a period of revolution T. If the gravitational force of attraction between planet and star is proportional to R−52 then T2 is proportional to

Calculate the combined resistance in each case:

Two circular coils A and B are placed close to each other. If the current in coil A is changed, will some current be induced in the coil B? Give reason for your answer.

An induced current is produced when a magnet in moved into a coil. The magnitude of induced current does not depend on : (a) the speed with which the magnet is moved (b) the number of turns of th coil (c) the resistivity of the wire of the coil (d) the strength of the magnet

The total energy of the system is called ___ of the system.

Question 174 A particular star is at a distance of about 8.1×1013 km from the Earth. Assuring that light travels at 3×108 m per second, find how long does light takes from that star to reach the Earth?

Of what substance are the brushes of an electric motor made?

Out of two bulbs 50W-220V and 100W-220V, which one will glow brighter:- a) when connected in series b) when connected in parallel .

Two conducting wires of the same material and of equal lengths and equal diameters are first connected in series and then in parallel with an electric circuit. The ratio of the heat produced in series and parallel combinations would be:

The refractive index of water is 4/3 and that of glass is 3/2. Calculate the refractive index of glass with respect to water.

The average temperature of the human body 37 °C. What will it be in °F?

An object is placed at a distance 2f from the pole of a convex mirror of focal length f​​​​​​. Then, the magnification is?

Calculate the heat dissipated across 6 Ω and 4 Ω resistors in 30 seconds.

If an object 10cm high is placed at a distance of 36 cm from a concave mirror of focal length 12cm, find the position, nature and height of image.

What is the cause of resistance?

Resistances of 6 ohm each are connected in the manner shown in adjoining figure. With the current ampere as shown in figure, the potential difference VP−VQ is

If i could run at the speed of light and could vibrate at its frequency then can i pass through a glass slab as light does?

Two exactly similar electric lamps are arranged (i) in parallel, and (ii) in series. If the parallel and series combination of lamps are connected to 220 V supply line one by one, what will be the ratio of electric power consumed by them ?

What does the bulge of cornea helps in?

A cut diamond sparkles because of its

Which of the following has the lowest wavelength?

The electrical resistance of depletion layer is large because

What is polarization and interference of light? Please explain me in detail.

At the time of short circuit, the current in the circuit : (a) reduces substantially (b) does not change (c) increases heavily (d) varies continuously

'A fuse is rated 8 A'. Can it be used with an electrical appliance of rating 5 kW, 200 V ?

The following diagrams show the splitting up of a composite light into its constituent colours. Which among the above figures is correct?

Complete the following sentence : Resonance is a special case of ........ vibrations, when frequency of the driving force is ........... natural frequency of the drivens body.

In which of the following devices semiconductors are used?

Statement 1: Charcoal is a better fuel than wood. Statement 2: Charcoal burns without flames, is comparatively smokeless and has higher heat generation.

A ray of light is incident on a medium at an angle 60°. The angle of refraction is different for different mediums for an angle of incidence = 60∘. In which medium is the speed of light lowest?

Where should an object be placed in front of convex lens so as to obtain the image formed on slide projector?

Vapourisation of compound is___.

How is sunlight responsible for wind energy?

The near point of a hypermetropic eye is 1 metre What is the power of the lens required to correct this defect? (Assuming that the near point of a normal eye as 25cm)

A resistor of 8 ohm disconnected in parallel with another resistor x. The resultant of the combination is 4.8 ohms. What is the value of resistor x

Two coils have a combined resistance of 25 ohms, when connected in series and a resistance of 4 ohms when connected in parallel. What is the resistance of each coil?

The magnetic field strength at 1, 2 and 3 in the given picture are such that:

What is the optical centre of a lens?

Where will light rays meet? Here F1 and F2 represents primary focus and secondary focus of the lens respectively

When a plain mirror is rotated 10° in clockwise direction and incident ray is rotated by 5° in the counterclockwise direction,by what angle will the reflected ray rotate ?

\N

Fill in the following blank with a suitable word : A ray of light which is parallel to the principal axis of a convex mirror, appears to be coming from ___ after reflection from the mirror.

A ring of radius R is uniformly charged, and it carries a total charge Q. At a point which is at a distance of R√3 from the center and lying on the axis of the ring, electric field due to half part is E1 & due to the other half part is E2, then

An object is placed at a distance 2f from the pole of a convex mirror of focal length f. Then, the magnification is?