16569 + Interview Questions in Physics

1.	The resistance of a wire is 10Ω. Its length is increased by 10% by stretching. The new resistance will now be
Answer» The resistance of a wire is $10 Ω$ . Its length is increased by 10% by stretching. The new resistance will now be

Discussion

2.	Name the type of mirror used by dentists. How does it help ?
Answer» Name the type of mirror used by dentists. How does it help ?

Discussion

3.	What is the energy transformation in a moving coil microphone?
Answer» What is the energy transformation in a moving coil microphone?

Discussion

4.	What is meant by power of a lens? You have two lenses A and B of focal lengths +10 cm and -10 cm respectively. State the nature and power of each lens. Which of the two lenses will form a virtual and magnified image of an object placed 8 cm from the lens? Draw a ray diagram to justify your answer.
Answer» What is meant by power of a lens? You have two lenses A and B of focal lengths +10 cm and -10 cm respectively. State the nature and power of each lens. Which of the two lenses will form a virtual and magnified image of an object placed 8 cm from the lens? Draw a ray diagram to justify your answer.

Discussion

5.	If 1020 electrons flow from the black body to the red body through the copper wire in 8 seconds, then find the current flowing through the wire.
Answer» If $10^{20}$ electrons flow from the black body to the red body through the copper wire in 8 seconds, then find the current flowing through the wire.

5.

If 1020 electrons flow from the black body to the red body through the copper wire in 8 seconds, then find the current flowing through the wire.

Answer»

If $10^{20}$ electrons flow from the black body to the red body through the copper wire in 8 seconds, then find the current flowing through the wire.

Discussion

6.	What is meant by scattering of light? Use this phenomenon to explain why the clear sky appears blue or the sun appears reddish at sunrise.
Answer» What is meant by scattering of light? Use this phenomenon to explain why the clear sky appears blue or the sun appears reddish at sunrise.

Discussion

7.	If the key in the arrangement, in the given figure is taken out (the circuit is made open) and magnetic field lines are drawn over the horizontal plane ABCD, the lines are:
Answer» If the key in the arrangement, in the given figure is taken out (the circuit is made open) and magnetic field lines are drawn over the horizontal plane ABCD, the lines are:

Discussion

8.	The colour emitted by a light emitting diode depends mainly on:
Answer» The colour emitted by a light emitting diode depends mainly on:

Discussion

9.	A converging lens of focal length 5 cm is placed at a distance of 20 cm from a screen. How far from the lens should an object be placed so as to form its real image on the screen ?
Answer» A converging lens of focal length 5 cm is placed at a distance of 20 cm from a screen. How far from the lens should an object be placed so as to form its real image on the screen ?

Discussion

10.	Name the law which relates the current in a conductor to the potential difference across its ends.
Answer» Name the law which relates the current in a conductor to the potential difference across its ends.

Discussion

11.	Newton's second law of motion is based on the conservation of ___ .
Answer» Newton's second law of motion is based on the conservation of ___ .

Discussion

12.	Name the physical quantity whose unit is " ohm".
Answer» Name the physical quantity whose unit is " ohm".

Discussion

13.	Why does the sun appear red at the time of sunset and sunrise? Explain.
Answer» Why does the sun appear red at the time of sunset and sunrise? Explain.

Discussion

14.	If a wire of resistance 20Ω is covered with ice and a voltage of 210 V is applied across the wire, then the rate of melting of ice is? [Specific latent heat of fusion of ice = 80 cal/g]
Answer» If a wire of resistance $20 Ω$ is covered with ice and a voltage of 210 V is applied across the wire, then the rate of melting of ice is? [Specific latent heat of fusion of ice = 80 cal/g]

Discussion

15.	What is a refrective mirror?
Answer» What is a refrective mirror?

Discussion

16.	At a given time a house is supplied with 100 A at 220 V. How many 75 W, 220 V light bulbs could be switched on in the house at the same time (if they are all connected in parallel)?
Answer» At a given time a house is supplied with 100 A at 220 V. How many 75 W, 220 V light bulbs could be switched on in the house at the same time (if they are all connected in parallel)?

Discussion

17.	Degradation of air quality, harmfully affecting living organisms is called __.
Answer» Degradation of air quality, harmfully affecting living organisms is called __.

Discussion

18.	Which of the statements is wrong among the following?
Answer» Which of the statements is wrong among the following?

Discussion

19.	When a ray of light passes from air into glass, is the angle of refraction greater than or less than the angle of incidence?
Answer» When a ray of light passes from air into glass, is the angle of refraction greater than or less than the angle of incidence?

Discussion

20.	In the circuit, if the forward voltage drop for the diode is 0.5V, the current will be
Answer» In the circuit, if the forward voltage drop for the diode is 0.5V, the current will be

Discussion

21.	An electric bulb is marked 18watt-240 volt. If it is used across 240 V power line for one hour daily, calculate the number of days to consume 1 unit of electric energy.
Answer» An electric bulb is marked 18watt-240 volt. If it is used across 240 V power line for one hour daily, calculate the number of days to consume 1 unit of electric energy.

Discussion

22.	Why should fossil fuels like coal and petroleum be used judiciously?
Answer» Why should fossil fuels like coal and petroleum be used judiciously?

Discussion

23.	From the graphs given below, choose the ohmic and non-ohmic curve. i) ii) iii) iv)
Answer» From the graphs given below, choose the ohmic and non-ohmic curve. i) ii) iii) iv)

Discussion

24.	In the above figure, the arrows indicate the direction of forces F1 and F2, the magnitudes of the respective force are given above the arrows, towards which direction will the block move?
Answer» In the above figure, the arrows indicate the direction of forces $F_{1}$ and $F_{2}$ , the magnitudes of the respective force are given above the arrows, towards which direction will the block move?

24.

In the above figure, the arrows indicate the direction of forces F1 and F2, the magnitudes of the respective force are given above the arrows, towards which direction will the block move?

Answer»

In the above figure, the arrows indicate the direction of forces $F_{1}$ and $F_{2}$ , the magnitudes of the respective force are given above the arrows, towards which direction will the block move?

Discussion

25.	A convex lens forms an image of the same size as the object at a distance of 30 cm from the lens. Find the power of the lens?
Answer» A convex lens forms an image of the same size as the object at a distance of $30 c m$ from the lens. Find the power of the lens?

Discussion

26.	What are the limitations of energy that can be harnessed from the sea ?
Answer» What are the limitations of energy that can be harnessed from the sea ?

Discussion

27.	The diagram in Figure shows an object AB and a converging lens lens L with foci F1 and F2. (a) Draw two rays from the object AB and complete the diagram to locate the position of image CD. Also mark on the Diagram the position of eye from where the image can be viewed. (b) State three characteristics of the image in relation to the object.
Answer» The diagram in Figure shows an object AB and a converging lens lens L with foci $F_{1} a n d F_{2}$ . (a) Draw two rays from the object AB and complete the diagram to locate the position of image CD. Also mark on the Diagram the position of eye from where the image can be viewed. (b) State three characteristics of the image in relation to the object.

27.

The diagram in Figure shows an object AB and a converging lens lens L with foci F1 and F2. (a) Draw two rays from the object AB and complete the diagram to locate the position of image CD. Also mark on the Diagram the position of eye from where the image can be viewed. (b) State three characteristics of the image in relation to the object.

Answer»

The diagram in Figure shows an object AB and a converging lens lens L with foci $F_{1} a n d F_{2}$ .

(a) Draw two rays from the object AB and complete the diagram to locate the position of image CD. Also mark on the Diagram the position of eye from where the image can be viewed.

(b) State three characteristics of the image in relation to the object.

Discussion

28.	Iron filings are sprinkled on a cardboard perpendicular to which a current carrying copper wire runs. The other components of the circuit have their usual meanings. Choose the correct option from the following.
Answer» Iron filings are sprinkled on a cardboard perpendicular to which a current carrying copper wire runs. The other components of the circuit have their usual meanings. Choose the correct option from the following.

28.

Iron filings are sprinkled on a cardboard perpendicular to which a current carrying copper wire runs. The other components of the circuit have their usual meanings. Choose the correct option from the following.

Answer»

Iron filings are sprinkled on a cardboard perpendicular to which a current carrying copper wire runs. The other components of the circuit have their usual meanings. Choose the correct option from the following.

Discussion

29.	Question 7 On what basis would you classify energy sources as (a) renewable and non-renewable? (b) exhaustible and inexhaustible? Are the options given in (a) and (b) the same?
Answer» Question 7 On what basis would you classify energy sources as (a) renewable and non-renewable? (b) exhaustible and inexhaustible? Are the options given in (a) and (b) the same?

Discussion

30.	In order to hear distinct echoes, the distance of the obstacle from the source of sound should be:
Answer» In order to hear distinct echoes, the distance of the obstacle from the source of sound should be:

Discussion

31.	The V-I graph for a series combination and for a parallel combination of two resistors is as shown in the figure below:Which one of these represent parallel connection.
Answer» The V-I graph for a series combination and for a parallel combination of two resistors is as shown in the figure below: Which one of these represent parallel connection.

31.

The V-I graph for a series combination and for a parallel combination of two resistors is as shown in the figure below:Which one of these represent parallel connection.

Answer»

The V-I graph for a series combination and for a parallel combination of two resistors is as shown in the figure below:

Which one of these represent parallel connection.

Discussion

32.	In a solar water heater, why is the storage tank placed at a higher level than the solar panel containing coils ?
Answer» In a solar water heater, why is the storage tank placed at a higher level than the solar panel containing coils ?

Discussion

33.	A ray passing through the centre of curvature hitting the spherical mirror makes an angle of ___ with the normal.
Answer» A ray passing through the centre of curvature hitting the spherical mirror makes an angle of ___ with the normal.

Discussion

34.	Fig. 7.27 shows the wave patterns of three sounds A, B and C. Name the characteristic of sound which is same between (i) A and B, (ii) B and C, and (iii) C and A.
Answer» Fig. 7.27 shows the wave patterns of three sounds A, B and C. Name the characteristic of sound which is same between (i) A and B, (ii) B and C, and (iii) C and A.

34.

Fig. 7.27 shows the wave patterns of three sounds A, B and C. Name the characteristic of sound which is same between (i) A and B, (ii) B and C, and (iii) C and A.

Answer»

Fig. 7.27 shows the wave patterns of three sounds A, B and C. Name the characteristic of sound which is same between (i) A and B, (ii) B and C, and (iii) C and A.

Discussion

35.	Complete the following sentences : (a) When current flows in a wire, it creates ..... (b) On reversing the direction of current in a wire, the magnetic field produced by it gets ..... (c) A current carrying solenoid behaves like a ...... (d) A current carrying solenoid when freely suspended, it always rests in ....... direction.
Answer» Complete the following sentences : (a) When current flows in a wire, it creates ..... (b) On reversing the direction of current in a wire, the magnetic field produced by it gets ..... (c) A current carrying solenoid behaves like a ...... (d) A current carrying solenoid when freely suspended, it always rests in ....... direction.

Discussion

36.	Three resistances 12 ohms each are connected in parallel. Three such combinations are connected in series. What is the total resistance in ohms?
Answer» Three resistances 12 ohms each are connected in parallel. Three such combinations are connected in series. What is the total resistance in ohms?

Discussion

37.	Q10. Consider the following statements about Biofuels: 1. Biofuels are combustible fuels created from biomass from recently living plant matter. 2. Biodiesel can be combusted in diesel engines. Select the correct answer using the codes given:
Answer» Q10. Consider the following statements about Biofuels: 1. Biofuels are combustible fuels created from biomass from recently living plant matter. 2. Biodiesel can be combusted in diesel engines. Select the correct answer using the codes given:

37.

Q10. Consider the following statements about Biofuels: 1. Biofuels are combustible fuels created from biomass from recently living plant matter. 2. Biodiesel can be combusted in diesel engines. Select the correct answer using the codes given:

Answer»

Q10. Consider the following statements about Biofuels:

1. Biofuels are combustible fuels created from biomass from recently living plant matter.

2. Biodiesel can be combusted in diesel engines.

Select the correct answer using the codes given:

Discussion

38.	Two particles have equal masses of 5.0 g each and opposite charges of +4×10−5C and −4×10−5C. They are released with a separation of 1.0 m between them. Find the speeds of the particles when the separation is reduced to 50 cm.
Answer» Two particles have equal masses of 5.0 g each and opposite charges of $+ 4 \times 10^{- 5} C$ and $- 4 \times 10^{- 5} C$ . They are released with a separation of 1.0 m between them. Find the speeds of the particles when the separation is reduced to 50 cm.

Discussion

39.	Hello Kshitij here I want to know that foosile fuel is exhaustible resource of nuclear energy is a exhaustible resource
Answer» Hello Kshitij here I want to know that foosile fuel is exhaustible resource of nuclear energy is a exhaustible resource

39.

Hello Kshitij here I want to know that foosile fuel is exhaustible resource of nuclear energy is a exhaustible resource

Answer»

Hello

Kshitij here I want to know that foosile fuel is exhaustible resource of nuclear energy is a exhaustible resource

Discussion

40.	Explain how the law of conservation of momentum can be used to explain (i) recoil of a gun (ii) motion of a rocket.
Answer» Explain how the law of conservation of momentum can be used to explain (i) recoil of a gun (ii) motion of a rocket.

Discussion

41.	Why is it said that dark matter or anti gravity can curve light?
Answer» Why is it said that dark matter or anti gravity can curve light?

Discussion

42.	The principle of conservation of linear momentum states that if in any assigned direction the net external force on a system is zero, then the linear momentum of the system will remain constant. Thus it can be concluded that if the momentum of a two-particle system is initially zero, then because of internal forces they will move in opposite directions to conserve momentum. Answer the following questions. Suppose you are on a cart initially at rest on a frictionless track. If you throw a ball off the cart towards the left with a velocity v, will the cart be put into motion?
Answer» The principle of conservation of linear momentum states that if in any assigned direction the net external force on a system is zero, then the linear momentum of the system will remain constant. Thus it can be concluded that if the momentum of a two-particle system is initially zero, then because of internal forces they will move in opposite directions to conserve momentum. Answer the following questions. Suppose you are on a cart initially at rest on a frictionless track. If you throw a ball off the cart towards the left with a velocity v, will the cart be put into motion?

Discussion

43.	A ray of light after refraction becomes perpendicular to the normal. What is this angle of incidence called?
Answer» A ray of light after refraction becomes perpendicular to the normal. What is this angle of incidence called?

Discussion

44.	___is called similar state of equilibrium.
Answer» ___is called similar state of equilibrium.

Discussion

45.	A person is suffering from both defects of vision, myopia and hypermetropia. He should use:
Answer» A person is suffering from both defects of vision, myopia and hypermetropia. He should use:

Discussion

46.	Blue colour of the sky is due to ___ of light.
Answer» Blue colour of the sky is due to ___ of light.

Discussion

47.	If a combination of 3 convex lens is arranged in the shown manner the focal length of lens I is + 10 cm, lens II is 20 cm and lens III is 40 cm. Calculate the total power of the combination of lens?
Answer» If a combination of 3 convex lens is arranged in the shown manner the focal length of lens I is + 10 cm, lens II is 20 cm and lens III is 40 cm. Calculate the total power of the combination of lens?

47.

If a combination of 3 convex lens is arranged in the shown manner the focal length of lens I is + 10 cm, lens II is 20 cm and lens III is 40 cm. Calculate the total power of the combination of lens?

Answer»

If a combination of 3 convex lens is arranged in the shown manner the focal length of lens I is + 10 cm, lens II is 20 cm and lens III is 40 cm. Calculate the total power of the combination of lens?

Discussion

48.	At sunrise or sunset, the sun looks reddish , because:
Answer» At sunrise or sunset, the sun looks reddish , because:

Discussion

49.	Each of the following is true for white and red phosphorus except that they
Answer» Each of the following is true for white and red phosphorus except that they

49.

Each of the following is true for white and red phosphorus except that they

Answer»

Each of the following is true for white and red phosphorus except that they

Discussion

50.	Fresh water flows freely on some areas of the earth’s crust, this is called as an __.
Answer» Fresh water flows freely on some areas of the earth’s crust, this is called as an __.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The resistance of a wire is 10Ω. Its length is increased by 10% by stretching. The new resistance will now be

Name the type of mirror used by dentists. How does it help ?

What is the energy transformation in a moving coil microphone?

What is meant by power of a lens? You have two lenses A and B of focal lengths +10 cm and -10 cm respectively. State the nature and power of each lens. Which of the two lenses will form a virtual and magnified image of an object placed 8 cm from the lens? Draw a ray diagram to justify your answer.

If 1020 electrons flow from the black body to the red body through the copper wire in 8 seconds, then find the current flowing through the wire.

What is meant by scattering of light? Use this phenomenon to explain why the clear sky appears blue or the sun appears reddish at sunrise.

If the key in the arrangement, in the given figure is taken out (the circuit is made open) and magnetic field lines are drawn over the horizontal plane ABCD, the lines are:

The colour emitted by a light emitting diode depends mainly on:

A converging lens of focal length 5 cm is placed at a distance of 20 cm from a screen. How far from the lens should an object be placed so as to form its real image on the screen ?

Name the law which relates the current in a conductor to the potential difference across its ends.

Newton's second law of motion is based on the conservation of ___ .

Name the physical quantity whose unit is " ohm".

Why does the sun appear red at the time of sunset and sunrise? Explain.

If a wire of resistance 20Ω is covered with ice and a voltage of 210 V is applied across the wire, then the rate of melting of ice is? [Specific latent heat of fusion of ice = 80 cal/g]

What is a refrective mirror?

At a given time a house is supplied with 100 A at 220 V. How many 75 W, 220 V light bulbs could be switched on in the house at the same time (if they are all connected in parallel)?

Degradation of air quality, harmfully affecting living organisms is called __.

Which of the statements is wrong among the following?

When a ray of light passes from air into glass, is the angle of refraction greater than or less than the angle of incidence?

In the circuit, if the forward voltage drop for the diode is 0.5V, the current will be

An electric bulb is marked 18watt-240 volt. If it is used across 240 V power line for one hour daily, calculate the number of days to consume 1 unit of electric energy.

Why should fossil fuels like coal and petroleum be used judiciously?

From the graphs given below, choose the ohmic and non-ohmic curve. i) ii) iii) iv)

In the above figure, the arrows indicate the direction of forces F1 and F2, the magnitudes of the respective force are given above the arrows, towards which direction will the block move?

A convex lens forms an image of the same size as the object at a distance of 30 cm from the lens. Find the power of the lens?

What are the limitations of energy that can be harnessed from the sea ?

Iron filings are sprinkled on a cardboard perpendicular to which a current carrying copper wire runs. The other components of the circuit have their usual meanings. Choose the correct option from the following.

Question 7 On what basis would you classify energy sources as (a) renewable and non-renewable? (b) exhaustible and inexhaustible? Are the options given in (a) and (b) the same?

In order to hear distinct echoes, the distance of the obstacle from the source of sound should be:

The V-I graph for a series combination and for a parallel combination of two resistors is as shown in the figure below:Which one of these represent parallel connection.

In a solar water heater, why is the storage tank placed at a higher level than the solar panel containing coils ?

A ray passing through the centre of curvature hitting the spherical mirror makes an angle of ___ with the normal.

Fig. 7.27 shows the wave patterns of three sounds A, B and C. Name the characteristic of sound which is same between (i) A and B, (ii) B and C, and (iii) C and A.

Three resistances 12 ohms each are connected in parallel. Three such combinations are connected in series. What is the total resistance in ohms?

Q10. Consider the following statements about Biofuels: 1. Biofuels are combustible fuels created from biomass from recently living plant matter. 2. Biodiesel can be combusted in diesel engines. Select the correct answer using the codes given:

Two particles have equal masses of 5.0 g each and opposite charges of +4×10−5C and −4×10−5C. They are released with a separation of 1.0 m between them. Find the speeds of the particles when the separation is reduced to 50 cm.

Hello Kshitij here I want to know that foosile fuel is exhaustible resource of nuclear energy is a exhaustible resource

Explain how the law of conservation of momentum can be used to explain (i) recoil of a gun (ii) motion of a rocket.

Why is it said that dark matter or anti gravity can curve light?

A ray of light after refraction becomes perpendicular to the normal. What is this angle of incidence called?

___is called similar state of equilibrium.

A person is suffering from both defects of vision, myopia and hypermetropia. He should use:

Blue colour of the sky is due to ___ of light.

If a combination of 3 convex lens is arranged in the shown manner the focal length of lens I is + 10 cm, lens II is 20 cm and lens III is 40 cm. Calculate the total power of the combination of lens?

At sunrise or sunset, the sun looks reddish , because:

Each of the following is true for white and red phosphorus except that they

Fresh water flows freely on some areas of the earth’s crust, this is called as an __.