16569 + Interview Questions in Physics

1.	Do bases conduct electricity? If so, diluted or concentrated? Why don't glucose and alcohol not conduct electricity being bases?
Answer» Do bases conduct electricity? If so, diluted or concentrated? Why don't glucose and alcohol not conduct electricity being bases?

Discussion

2.	1 Vm-1 equal
Answer» 1 Vm^-1equal

Discussion

3.	Define the term heat.
Answer» Define the term heat.

Discussion

4.	A, B and C are voltmeters of resistance R,1.5 R and 3R respectively as shown in the figure.When some potential difference is applied between X and Y, the voltmeter readings are VA, VB and VC respectively.Then :
Answer» A, B and C are voltmeters of resistance R,1.5 R and 3R respectively as shown in the figure.When some potential difference is applied between X and Y, the voltmeter readings are $V_{A}, V_{B}$ and $V_{C}$ respectively.Then :

4.

A, B and C are voltmeters of resistance R,1.5 R and 3R respectively as shown in the figure.When some potential difference is applied between X and Y, the voltmeter readings are VA, VB and VC respectively.Then :

Answer»

A, B and C are voltmeters of resistance R,1.5 R and 3R respectively as shown in the figure.When some potential difference is applied between X and Y, the voltmeter readings are $V_{A}, V_{B}$ and $V_{C}$ respectively.Then :

Discussion

5.	In which of the following situations, does the list of numbers involved make an arithmetic progression, and why? (i)The amount of air present in a cylinder when a vacuum pump removes (14)th of the air remaining in the cylinder at a time. (ii)The cost of digging a well after every meter of digging, when it costs Rs 150 for the first meter and rises by Rs 50 for each subsequent meter.
Answer» In which of the following situations, does the list of numbers involved make an arithmetic progression, and why? (i)The amount of air present in a cylinder when a vacuum pump removes ( $\frac{1}{4})^{t h}$ of the air remaining in the cylinder at a time. (ii)The cost of digging a well after every meter of digging, when it costs Rs 150 for the first meter and rises by Rs 50 for each subsequent meter.

Discussion

6.	Establish mirror formula for the case of the convex mirror. What are the assumptions made in this derivation?
Answer» Establish mirror formula for the case of the convex mirror. What are the assumptions made in this derivation?

Discussion

7.	Fill in the following blanks with suitable words : (a) Biomass is another form in which ___ energy manifests itself. (b) Tidal waves build up and recede ___ a day .
Answer» Fill in the following blanks with suitable words : (a) Biomass is another form in which ___ energy manifests itself. (b) Tidal waves build up and recede ___ a day .

Discussion

8.	In AC, the direction of current alters after every fixed interval of time, then why we have one wire termed as live wire and the other termed as neutral wire, both should have been termed as live or neutral wire.
Answer» In AC, the direction of current alters after every fixed interval of time, then why we have one wire termed as live wire and the other termed as neutral wire, both should have been termed as live or neutral wire.

Discussion

9.	State two advantages of conserving (i) forests, and (ii) wildlife.
Answer» State two advantages of conserving (i) forests, and (ii) wildlife.

Discussion

10.	Which one has a higher electrical resistance : a 100 watt bulb or a 60 watt bulb?
Answer» Which one has a higher electrical resistance : a 100 watt bulb or a 60 watt bulb?

Discussion

11.	What happens to the other bulbes in a series circuit if one bulb blows off?
Answer» What happens to the other bulbes in a series circuit if one bulb blows off?

Discussion

12.	Why is Tungsten metal not used as a Thermionic emitter? How is it modified to be a good Thermion emitter?
Answer» Why is Tungsten metal not used as a Thermionic emitter? How is it modified to be a good Thermion emitter?

Discussion

13.	What is the main purpose of rainwater harvesting?
Answer» What is the main purpose of rainwater harvesting?

Discussion

14.	What is the name of the phenomenon in which the right side of an object appears to be the left side of the image in a plane mirror?
Answer» What is the name of the phenomenon in which the right side of an object appears to be the left side of the image in a plane mirror?

Discussion

15.	Find the current in each resistor in the circuit shown below:
Answer» Find the current in each resistor in the circuit shown below:

Discussion

16.	The cost of fuel transportation is maximum in:
Answer» The cost of fuel transportation is maximum in:

Discussion

17.	Which among the following images show the correct path of a light ray while passing through a rectangular glass slab?
Answer» Which among the following images show the correct path of a light ray while passing through a rectangular glass slab?

Discussion

18.	What is an earth electrode?
Answer» What is an earth electrode?

Discussion

19.	What is the unit of the specific latent heat of fusion?
Answer» What is the unit of the specific latent heat of fusion?

Discussion

20.	The wavefunction of a 2s electron is given by ψ2s=14√2π(1a0)32(2−ra0)e−ra0 It has a node at r=r0. The value of r0a0 is___
Answer» The wavefunction of a 2s electron is given by $ψ_{2 s} = \frac{1}{4 \sqrt{2} π} (\frac{1}{a_{0}})^{\frac{3}{2}} (2 - \frac{r}{a_{0}}) e^{\frac{- r}{a_{0}}}$ It has a node at $r = r_{0}$ . The value of $\frac{r_{0}}{a_{0}}$ is___

Discussion

21.	Smoke has generally blue tinge. It is due to:
Answer» Smoke has generally blue tinge. It is due to:

Discussion

22.	State Ohm's law. Draw a labelled circuit diagram to verify this law in the laboratory. Draw a V-I graph for the same and explain how would you use this graph to determine the resistance of the conductor.
Answer» State Ohm's law. Draw a labelled circuit diagram to verify this law in the laboratory. Draw a V-I graph for the same and explain how would you use this graph to determine the resistance of the conductor.

Discussion

23.	Two resistances of 100 Ω and 0 Ω are connected in parallel. The overall resistance will be ___ ohm.
Answer» Two resistances of 100 Ω and 0 Ω are connected in parallel. The overall resistance will be ___ ohm.

Discussion

24.	A boy stands between the two walls and claps his hands as shown below: If x is less than 60 m and the time between the first and the second echo is 0.25 s, then calculate the distance x. (Velocity of sound in air is 344 ms−1)
Answer» A boy stands between the two walls and claps his hands as shown below: If $x$ is less than $60 m$ and the time between the first and the second echo is $0.25 s$ , then calculate the distance $x$ . (Velocity of sound in air is 344 $m s^{- 1}$ )

Discussion

25.	What kind of mirrors are used in big shopping centres to watch the activities of the customers ?
Answer» What kind of mirrors are used in big shopping centres to watch the activities of the customers ?

Discussion

26.	A sound produced on the surface of a lake takes 4.5 s to reach a boatman. How much time will it take to reach a driver inside water at the same distance if speed of sound in water is 4.5 times the speed of sound in air?
Answer» A sound produced on the surface of a lake takes 4.5 s to reach a boatman. How much time will it take to reach a driver inside water at the same distance if speed of sound in water is 4.5 times the speed of sound in air?

Discussion

27.	A beam of light travelling parallel to the principal axis of a concave lens appears to diverge from a point 25 cm behind the lens after refraction. Calculate the power of the lens.
Answer» A beam of light travelling parallel to the principal axis of a concave lens appears to diverge from a point 25 cm behind the lens after refraction. Calculate the power of the lens.

Discussion

28.	___ coloured light has the largest wavelength.
Answer» ___ coloured light has the largest wavelength.

Discussion

29.	Draw a neat labelled diagram to show the direction of two forces acting on a body to produce rotation in it. Also mark the point O about which the rotation takes place.
Answer» Draw a neat labelled diagram to show the direction of two forces acting on a body to produce rotation in it. Also mark the point O about which the rotation takes place.

Discussion

30.	How are the potential difference (V), current (I) and resistance (R) related ?
Answer» How are the potential difference (V), current (I) and resistance (R) related ?

Discussion

31.	Question 11 Which of the nets given below will generate a cone?
Answer» Question 11 Which of the nets given below will generate a cone?

Discussion

32.	A copper wire of resistivity 1.6 ×10-8ohm metre has a cross sectional area of 20×10-4cm2. Calculate the length of the wire required to make a 10 ohm coil.
Answer» A copper wire of resistivity 1.6 ×10^-8ohm metre has a cross sectional area of 20×10^-4cm². Calculate the length of the wire required to make a 10 ohm coil.

Discussion

33.	Solar panels are used for harnessing solar energy. This solar energy is then used to charge an electric cell and this electric cell is used to move a toy. What are the energy changes that take place?
Answer» Solar panels are used for harnessing solar energy. This solar energy is then used to charge an electric cell and this electric cell is used to move a toy. What are the energy changes that take place?

Discussion

34.	A ray of light from a denser medium strikes a rarer medium at an angle of incidence i as shown in the figure. The reflected and refracted rays make an angle of 90∘ with each other. The angles of reflection and refraction are r and r'. The critical angle is:
Answer» A ray of light from a denser medium strikes a rarer medium at an angle of incidence $i$ as shown in the figure. The reflected and refracted rays make an angle of $90^{\circ}$ with each other. The angles of reflection and refraction are r and r'. The critical angle is:

Discussion

35.	Light is physical but colour is psychological. Justify the statement
Answer» Light is physical but colour is psychological. Justify the statement

Discussion

36.	The centre of curvature of a convex lens is at 40 cm and its central portion is wrapped in black paper as shown below. If an object is placed at 90 cm, find the nature of image formed.
Answer» The centre of curvature of a convex lens is at $40 c m$ and its central portion is wrapped in black paper as shown below. If an object is placed at $90 c m$ , find the nature of image formed.

Discussion

37.	Which of the following is not a fossil fuel? (a) coal (b) petroleum gas (c) biogas (d) natural gas
Answer» Which of the following is not a fossil fuel? (a) coal (b) petroleum gas (c) biogas (d) natural gas

Discussion

38.	Show how you would connect three resistors each of resistance 6 Ω so that the combination has a resistance of (i) 9 Ω (ii) 2 Ω
Answer» Show how you would connect three resistors each of resistance 6 $Ω$ so that the combination has a resistance of (i) 9 $Ω$ (ii) 2 $Ω$

38.

Show how you would connect three resistors each of resistance 6 Ω so that the combination has a resistance of (i) 9 Ω (ii) 2 Ω

Answer»

Show how you would connect three resistors each of resistance 6 $Ω$ so that the combination has a resistance of

(i) 9 $Ω$

(ii) 2 $Ω$

Discussion

39.	while doing the calculation in determining magnification of a mirror, Sam used an equation of the form m= f-v ÷f. Check the validity of that equation. Also derive an equation for magnification in terms of 'f' and 'u'. [Hint:use mirror formula]
Answer» while doing the calculation in determining magnification of a mirror, Sam used an equation of the form m= f-v ÷f. Check the validity of that equation. Also derive an equation for magnification in terms of 'f' and 'u'. [Hint:use mirror formula]

Discussion

40.	A person is standing on ice at place A on avfreezed pond. He has one gun and 2 bullets. How can he move from place A to another distance place B and stop there?
Answer» A person is standing on ice at place A on avfreezed pond. He has one gun and 2 bullets. How can he move from place A to another distance place B and stop there?

Discussion

41.	What takes place in the fuse when it melts to break the electric circuit?
Answer» What takes place in the fuse when it melts to break the electric circuit?

Discussion

42.	A rifleman, who together with his rifle has a mass of 100 kg, stands on a smooth surface fire 10 shots horizontally. Each bullet has a mass 10 g projected with a velocity of 800 ms. What velocity does rifleman acquire at the end of 10 shots?
Answer» A rifleman, who together with his rifle has a mass of 100 kg, stands on a smooth surface fire 10 shots horizontally. Each bullet has a mass 10 g projected with a velocity of 800 $\frac{m}{s}$ . What velocity does rifleman acquire at the end of 10 shots?

Discussion

43.	A conductor of resistance 10 ohm is stretch to twice it's length. Find its resistance
Answer» A conductor of resistance 10 ohm is stretch to twice it's length. Find its resistance

Discussion

44.	Can there be any way to convert sound energy to electricity
Answer» Can there be any way to convert sound energy to electricity

Discussion

45.	How can potential difference set up electric field? And how can this electric field move from positive charge to negative charge? According to drude and Lorentz.
Answer» How can potential difference set up electric field? And how can this electric field move from positive charge to negative charge? According to drude and Lorentz.

Discussion

46.	A battery of emf 15V and internal resistance 2ohm is connected to two resistor of 4 and 6ohms joined in series. Find electrical energy spent per minute in 6ohm resistor.
Answer» A battery of emf 15V and internal resistance 2ohm is connected to two resistor of 4 and 6ohms joined in series. Find electrical energy spent per minute in 6ohm resistor.

Discussion

47.	Why light doesn't come out from a glass slab when angle is increased in denser medium
Answer» Why light doesn't come out from a glass slab when angle is increased in denser medium

Discussion

48.	When a person walking in bright sunlight enters a dark room, he is not able to see clearly for a little while because.
Answer» When a person walking in bright sunlight enters a dark room, he is not able to see clearly for a little while because.

Discussion

49.	Why does a compass needle get deflected when placed in a magnetic field? is it because the north pole of the compass needle and north pole of the magnet deflect?
Answer» Why does a compass needle get deflected when placed in a magnetic field? is it because the north pole of the compass needle and north pole of the magnet deflect?

Discussion

50.	30 cm high bucket is completely filled with liquid. A coin at its bottom appear to be raised by 12 cm. Then what is the refractive index of liquid!?
Answer» 30 cm high bucket is completely filled with liquid. A coin at its bottom appear to be raised by 12 cm. Then what is the refractive index of liquid!?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Do bases conduct electricity? If so, diluted or concentrated? Why don't glucose and alcohol not conduct electricity being bases?

1 Vm-1 equal

Define the term heat.

A, B and C are voltmeters of resistance R,1.5 R and 3R respectively as shown in the figure.When some potential difference is applied between X and Y, the voltmeter readings are VA, VB and VC respectively.Then :

Establish mirror formula for the case of the convex mirror. What are the assumptions made in this derivation?

Fill in the following blanks with suitable words : (a) Biomass is another form in which ___ energy manifests itself. (b) Tidal waves build up and recede ___ a day .

In AC, the direction of current alters after every fixed interval of time, then why we have one wire termed as live wire and the other termed as neutral wire, both should have been termed as live or neutral wire.

State two advantages of conserving (i) forests, and (ii) wildlife.

Which one has a higher electrical resistance : a 100 watt bulb or a 60 watt bulb?

What happens to the other bulbes in a series circuit if one bulb blows off?

Why is Tungsten metal not used as a Thermionic emitter? How is it modified to be a good Thermion emitter?

What is the main purpose of rainwater harvesting?

What is the name of the phenomenon in which the right side of an object appears to be the left side of the image in a plane mirror?

Find the current in each resistor in the circuit shown below:

The cost of fuel transportation is maximum in:

Which among the following images show the correct path of a light ray while passing through a rectangular glass slab?

What is an earth electrode?

What is the unit of the specific latent heat of fusion?

The wavefunction of a 2s electron is given by ψ2s=14√2π(1a0)32(2−ra0)e−ra0 It has a node at r=r0. The value of r0a0 is___

Smoke has generally blue tinge. It is due to:

State Ohm's law. Draw a labelled circuit diagram to verify this law in the laboratory. Draw a V-I graph for the same and explain how would you use this graph to determine the resistance of the conductor.

Two resistances of 100 Ω and 0 Ω are connected in parallel. The overall resistance will be ___ ohm.

A boy stands between the two walls and claps his hands as shown below: If x is less than 60 m and the time between the first and the second echo is 0.25 s, then calculate the distance x. (Velocity of sound in air is 344 ms−1)

What kind of mirrors are used in big shopping centres to watch the activities of the customers ?

A sound produced on the surface of a lake takes 4.5 s to reach a boatman. How much time will it take to reach a driver inside water at the same distance if speed of sound in water is 4.5 times the speed of sound in air?

A beam of light travelling parallel to the principal axis of a concave lens appears to diverge from a point 25 cm behind the lens after refraction. Calculate the power of the lens.

___ coloured light has the largest wavelength.

Draw a neat labelled diagram to show the direction of two forces acting on a body to produce rotation in it. Also mark the point O about which the rotation takes place.

How are the potential difference (V), current (I) and resistance (R) related ?

Question 11 Which of the nets given below will generate a cone?

A copper wire of resistivity 1.6 ×10-8ohm metre has a cross sectional area of 20×10-4cm2. Calculate the length of the wire required to make a 10 ohm coil.

Solar panels are used for harnessing solar energy. This solar energy is then used to charge an electric cell and this electric cell is used to move a toy. What are the energy changes that take place?

A ray of light from a denser medium strikes a rarer medium at an angle of incidence i as shown in the figure. The reflected and refracted rays make an angle of 90∘ with each other. The angles of reflection and refraction are r and r'. The critical angle is:

Light is physical but colour is psychological. Justify the statement

The centre of curvature of a convex lens is at 40 cm and its central portion is wrapped in black paper as shown below. If an object is placed at 90 cm, find the nature of image formed.

Which of the following is not a fossil fuel? (a) coal (b) petroleum gas (c) biogas (d) natural gas

Show how you would connect three resistors each of resistance 6 Ω so that the combination has a resistance of (i) 9 Ω (ii) 2 Ω

while doing the calculation in determining magnification of a mirror, Sam used an equation of the form m= f-v ÷f. Check the validity of that equation. Also derive an equation for magnification in terms of 'f' and 'u'. [Hint:use mirror formula]

A person is standing on ice at place A on avfreezed pond. He has one gun and 2 bullets. How can he move from place A to another distance place B and stop there?

What takes place in the fuse when it melts to break the electric circuit?

A rifleman, who together with his rifle has a mass of 100 kg, stands on a smooth surface fire 10 shots horizontally. Each bullet has a mass 10 g projected with a velocity of 800 ms. What velocity does rifleman acquire at the end of 10 shots?

A conductor of resistance 10 ohm is stretch to twice it's length. Find its resistance

Can there be any way to convert sound energy to electricity

How can potential difference set up electric field? And how can this electric field move from positive charge to negative charge? According to drude and Lorentz.

A battery of emf 15V and internal resistance 2ohm is connected to two resistor of 4 and 6ohms joined in series. Find electrical energy spent per minute in 6ohm resistor. ​

Why light doesn't come out from a glass slab when angle is increased in denser medium

When a person walking in bright sunlight enters a dark room, he is not able to see clearly for a little while because.

Why does a compass needle get deflected when placed in a magnetic field? is it because the north pole of the compass needle and north pole of the magnet deflect?

30 cm high bucket is completely filled with liquid. A coin at its bottom appear to be raised by 12 cm. Then what is the refractive index of liquid!?

Fill in the following blanks with suitable words : (a) Biomass is another form in which _ energy manifests itself. (b) Tidal waves build up and recede _ a day .

A battery of emf 15V and internal resistance 2ohm is connected to two resistor of 4 and 6ohms joined in series. Find electrical energy spent per minute in 6ohm resistor.