16569 + Interview Questions in Physics

1.	Explain the principle of working of thermal powe plant. Draw a labelled diagram to illustrate your answer.
Answer» Explain the principle of working of thermal powe plant. Draw a labelled diagram to illustrate your answer.

Discussion

2.	FOCUS :focus also called an image point, is the point where light rays originating from a point on the object converge.. BUT, when the object is kept beyond the centre of curvature then rays converge between centre of curvature and the point focus. So now that point CAN BE called as the FOCUS.
Answer» FOCUS :focus also called an image point, is the point where light rays originating from a point on the object converge.. BUT, when the object is kept beyond the centre of curvature then rays converge between centre of curvature and the point focus. So now that point CAN BE called as the FOCUS.

2.

FOCUS :focus also called an image point, is the point where light rays originating from a point on the object converge.. BUT, when the object is kept beyond the centre of curvature then rays converge between centre of curvature and the point focus. So now that point CAN BE called as the FOCUS.

Answer»

FOCUS :focus also called an image point, is the point where light rays originating from a point on the object converge..

BUT, when the object is kept beyond the centre of curvature then rays converge between centre of curvature and the point focus. So now that point CAN BE called as the FOCUS.

Discussion

3.	How does inserting the control rods in the graphite core affect the fission in the reactor ? Explain your answer.
Answer» How does inserting the control rods in the graphite core affect the fission in the reactor ? Explain your answer.

Discussion

4.	What are the two forms of mechanical energy?
Answer» What are the two forms of mechanical energy?

Discussion

5.	A is an object with image size 4 cm and O’ A’ is the image of the object. Find out the image height and nature of the image formed.
Answer» A is an object with image size 4 cm and O’ A’ is the image of the object. Find out the image height and nature of the image formed.

5.

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

Answer»

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

Discussion

6.	What is an open drain system? How does it affect human beings? [2 MARKS]
Answer» What is an open drain system? How does it affect human beings? [2 MARKS]

Discussion

7.	What is the eye lens composed of?
Answer» What is the eye lens composed of?

Discussion

8.	When and how does a convex lens behave like a concave lens?
Answer» When and how does a convex lens behave like a concave lens?

Discussion

9.	Which of the following quantity determines the direction of flow of heat?
Answer» Which of the following quantity determines the direction of flow of heat?

Discussion

10.	What is the usual capactiy of an electric fuse used (i) in the lighting circuit, and (ii) in the power circuit, of a small house ?
Answer» What is the usual capactiy of an electric fuse used (i) in the lighting circuit, and (ii) in the power circuit, of a small house ?

Discussion

11.	What current will be taken by a 920 W appliance if the supply voltage is 230 V ?
Answer» What current will be taken by a 920 W appliance if the supply voltage is 230 V ?

Discussion

12.	Why does wet clothes appear to be darker than dry clothes?
Answer» Why does wet clothes appear to be darker than dry clothes?

Discussion

13.	As per the concept, we are able to see because the light gets reflected from the object and reach our eyes.but what when the light gets reflected but don't reach our eyes?
Answer» As per the concept, we are able to see because the light gets reflected from the object and reach our eyes.but what when the light gets reflected but don't reach our eyes?

Discussion

14.	In the given circuit if point C is connected to the earth and a potential of +80 V is given to the point A, the potential at B is
Answer» In the given circuit if point $C$ is connected to the earth and a potential of $+ 80 V$ is given to the point $A$ , the potential at $B$ is

Discussion

15.	An electric heater connected to a 220V lines has two resistance coils of 22 Ohms each. Calculate the current if these coils are used: a) Separately b) In Series c) In Parallel
Answer» An electric heater connected to a 220V lines has two resistance coils of 22 Ohms each. Calculate the current if these coils are used: a) Separately b) In Series c) In Parallel

15.

An electric heater connected to a 220V lines has two resistance coils of 22 Ohms each. Calculate the current if these coils are used: a) Separately b) In Series c) In Parallel

Answer»

An electric heater connected to a 220V lines has two resistance coils of 22 Ohms each. Calculate the current if these coils are used:

a) Separately
b) In Series
c) In Parallel

Discussion

16.	Write an expression for the electrical power spent in flow of current through a conductor in terms of (a) resistance and potential difference (b) current and resistance.
Answer» Write an expression for the electrical power spent in flow of current through a conductor in terms of (a) resistance and potential difference (b) current and resistance.

Discussion

17.	which bulb will glow
Answer» which bulb will glow

Discussion

18.	Which is the major component of biogas?
Answer» Which is the major component of biogas?

Discussion

19.	Name and state the rule to find the direction of : (a) current induced in a coil due to its rotation in a magnetic field. (b) force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it.
Answer» Name and state the rule to find the direction of : (a) current induced in a coil due to its rotation in a magnetic field. (b) force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it.

19.

Name and state the rule to find the direction of : (a) current induced in a coil due to its rotation in a magnetic field. (b) force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it.

Answer»

Name and state the rule to find the direction of :

(a) current induced in a coil due to its rotation in a magnetic field.

(b) force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it.

Discussion

20.	When a 4Ω resistor is connected across the terminals of a 12 V battery, the number of coulombs passing through the resistor per second is: (a) 0.3 (b) 3 (c) 4 (d) 12
Answer» When a $4 Ω$ resistor is connected across the terminals of a 12 V battery, the number of coulombs passing through the resistor per second is: (a) 0.3 (b) 3 (c) 4 (d) 12

Discussion

21.	A dark muscular diaphragm that controls the size of the pupil is ______.
Answer» A dark muscular diaphragm that controls the size of the pupil is ______.

Discussion

22.	The graph, shown in the diagram, represents the variation of temperature (T) of the bodies, x and y having same surface area, with time (t) due to the emission of radiation. Find the correct relation between the emissivity and absorptivity power of the two bodies
Answer» The graph, shown in the diagram, represents the variation of temperature (T) of the bodies, x and y having same surface area, with time (t) due to the emission of radiation. Find the correct relation between the emissivity and absorptivity power of the two bodies

Discussion

23.	The temperature required for the nuclear fusion is approximately.
Answer» The temperature required for the nuclear fusion is approximately.

Discussion

24.	Lets say if there was no atmosphere on the earth, would scattering of light happen even then?
Answer» Lets say if there was no atmosphere on the earth, would scattering of light happen even then?

Discussion

25.	The main fuse is connected in : (a) live wire (b) neutral wire (c) both the live and earth wires (d) both the earth and neutral wires.
Answer» The main fuse is connected in : (a) live wire (b) neutral wire (c) both the live and earth wires (d) both the earth and neutral wires.

25.

The main fuse is connected in : (a) live wire (b) neutral wire (c) both the live and earth wires (d) both the earth and neutral wires.

Answer»

The main fuse is connected in :

(a) live wire

(b) neutral wire

(c) both the live and earth wires

(d) both the earth and neutral wires.

Discussion

26.	In a PNP transistor working as a common-base amplifier, current gain is 0.96 and emitter current is 7.2 mA. The base current is
Answer» In a PNP transistor working as a common-base amplifier, current gain is 0.96 and emitter current is 7.2 mA. The base current is

Discussion

27.	When 90Th228 transforms to 83Bi212, then the number of the emitted α -and β -particles is, respectively
Answer» When $_{90} T h^{228}$ transforms to $_{83} B i^{212}$ , then the number of the emitted $α$ -and $β$ -particles is, respectively

Discussion

28.	A piece of wire with resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is R′, then the ratio RR′ is:
Answer» A piece of wire with resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is ${R^{'}}$ , then the ratio $\frac{R}{{R^{'}}}$ is:

Discussion

29.	How can we identify that the height of the image we get is negative or positive?
Answer» How can we identify that the height of the image we get is negative or positive?

Discussion

30.	Why in resistance in parallel has current in common?
Answer» Why in resistance in parallel has current in common?

Discussion

31.	A frontend loader applied 150 N of force to lift a stone,1250 joules of work was done. How far was the rock lifted?
Answer» A frontend loader applied 150 N of force to lift a stone,1250 joules of work was done. How far was the rock lifted?

Discussion

32.	Fill in the following blanks with suitable words : We can see the sun about ___ minutes before the actual sunrise and about ___ minutes after the actual sunset because of atmospheric ___
Answer» Fill in the following blanks with suitable words : We can see the sun about ___ minutes before the actual sunrise and about ___ minutes after the actual sunset because of atmospheric ___

Discussion

33.	Two points have a potential difference of 10V. After connecting a conductor with zero resistance between the points,the final potential at each point becomes 25V. What could be their initial potentials?
Answer» Two points have a potential difference of 10V. After connecting a conductor with zero resistance between the points,the final potential at each point becomes 25V. What could be their initial potentials?

Discussion

34.	Which gaseous fuel is being used increasingly in transport vehicles like cars and buses these days?
Answer» Which gaseous fuel is being used increasingly in transport vehicles like cars and buses these days?

Discussion

35.	State any two properties of magnetic field lines.
Answer» State any two properties of magnetic field lines.

Discussion

36.	With both eyes open, a person's field of view is about : (a) 90∘ (b) 150∘ (c) 180∘ (d) 360∘
Answer» With both eyes open, a person's field of view is about : (a) $90^{\circ}$ (b) $150^{\circ}$ (c) $180^{\circ}$ (d) $360^{\circ}$

Discussion

37.	In the given figure, there is a bi-focal lens, used to correct a presbyopic person, what is region 1 and 2?
Answer» In the given figure, there is a bi-focal lens, used to correct a presbyopic person, what is region 1 and 2?

37.

In the given figure, there is a bi-focal lens, used to correct a presbyopic person, what is region 1 and 2?

Answer»

In the given figure, there is a bi-focal lens, used to correct a presbyopic person, what is region 1 and 2?

Discussion

38.	A person cannot see the distant objects clearly (though he can see the nearby objects clearly). He is suffering from the defect of vision called : (a) cataract (b) hypermetropia (c) myopia (d) presbyopia
Answer» A person cannot see the distant objects clearly (though he can see the nearby objects clearly). He is suffering from the defect of vision called : (a) cataract (b) hypermetropia (c) myopia (d) presbyopia

Discussion

39.	What happens to the pupil, if you see the sunlight directly?
Answer» What happens to the pupil, if you see the sunlight directly?

Discussion

40.	When a magnet is brought close to a wire, the magnetic field around the wire ___.
Answer» When a magnet is brought close to a wire, the magnetic field around the wire ___.

Discussion

41.	The focal length of a convex lens is 25 cm. At what distance from the optical centre of the lens an object be placed to obtain a virtual image of twice the size ?
Answer» The focal length of a convex lens is 25 cm. At what distance from the optical centre of the lens an object be placed to obtain a virtual image of twice the size ?

Discussion

42.	Optical fibres have ___ transparent layers of different refractive index.
Answer» Optical fibres have ___ transparent layers of different refractive index.

Discussion

43.	A cut piece of diamond appears to sparkle much more than an identically cut piece of glass. Why?
Answer» A cut piece of diamond appears to sparkle much more than an identically cut piece of glass. Why?

Discussion

44.	The specific heat capacity of water is : (a) 4200 J kg−1 K−1 (b) 420 J kg−1 K−1 (c) 0.42 J g−1 K−1 (d) 4.2 J kg−1 K−1
Answer» The specific heat capacity of water is : (a) 4200 J k $g^{- 1} K^{- 1}$ (b) 420 J k $g^{- 1} K^{- 1}$ (c) 0.42 J $g^{- 1} K^{- 1}$ (d) 4.2 J k $g^{- 1} K^{- 1}$

44.

The specific heat capacity of water is : (a) 4200 J kg−1 K−1 (b) 420 J kg−1 K−1 (c) 0.42 J g−1 K−1 (d) 4.2 J kg−1 K−1

Answer»

The specific heat capacity of water is :

(a) 4200 J k $g^{- 1} K^{- 1}$ (b) 420 J k $g^{- 1} K^{- 1}$

(c) 0.42 J $g^{- 1} K^{- 1}$ (d) 4.2 J k $g^{- 1} K^{- 1}$

Discussion

45.	Heat energy lost by a hot body is equal to heat energy gained by the cold body. Which of the following option/options below is/are associated with the above statement?
Answer» Heat energy lost by a hot body is equal to heat energy gained by the cold body. Which of the following option/options below is/are associated with the above statement?

Discussion

46.	(a) Calculate the heat capacity of a copper vessel of mass 150 g if the specific heat capacity of copper is 410 J kg−1 K−1. (b) How much heat energy will be required to increase the temperature of the vessel in part(a) from 25∘C to 35∘C?
Answer» (a) Calculate the heat capacity of a copper vessel of mass 150 g if the specific heat capacity of copper is 410 J $k g^{- 1} K^{- 1}$ . (b) How much heat energy will be required to increase the temperature of the vessel in part(a) from 25 $^{\circ} C t o 35^{\circ} C$ ?

46.

(a) Calculate the heat capacity of a copper vessel of mass 150 g if the specific heat capacity of copper is 410 J kg−1 K−1. (b) How much heat energy will be required to increase the temperature of the vessel in part(a) from 25∘C to 35∘C?

Answer»

(a) Calculate the heat capacity of a copper vessel of mass 150 g if the specific heat capacity of copper is 410 J $k g^{- 1} K^{- 1}$ .

(b) How much heat energy will be required to increase the temperature of the vessel in part(a) from 25 $^{\circ} C t o 35^{\circ} C$ ?

Discussion

47.	What is an electromagnet?How is it different from a permanent magnet?State two uses of electromagnet.
Answer» What is an electromagnet?How is it different from a permanent magnet?State two uses of electromagnet.

Discussion

48.	Due to gradual weakening of ciliary muscles and diminishing flexibility of the lens a certain defect of vision arises. Write the name of this defect . Name the type of lens required by such persons to remove the vision. Explain the structure and function of such a lens.
Answer» Due to gradual weakening of ciliary muscles and diminishing flexibility of the lens a certain defect of vision arises. Write the name of this defect . Name the type of lens required by such persons to remove the vision. Explain the structure and function of such a lens.

Discussion

49.	What do you mean by clockwise and anti-clockwise moment?
Answer» What do you mean by clockwise and anti-clockwise moment?

Discussion

50.	A current flows downwards in a wire that passes vertically through a table top. Will the magnetic field lines around it go clockwise or anticlockwise when viewed from above the table ?
Answer» A current flows downwards in a wire that passes vertically through a table top. Will the magnetic field lines around it go clockwise or anticlockwise when viewed from above the table ?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Explain the principle of working of thermal powe plant. Draw a labelled diagram to illustrate your answer.

FOCUS :focus also called an image point, is the point where light rays originating from a point on the object converge.. BUT, when the object is kept beyond the centre of curvature then rays converge between centre of curvature and the point focus. So now that point CAN BE called as the FOCUS.

How does inserting the control rods in the graphite core affect the fission in the reactor ? Explain your answer.

What are the two forms of mechanical energy?

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

What is an open drain system? How does it affect human beings? [2 MARKS]

What is the eye lens composed of?

When and how does a convex lens behave like a concave lens?

Which of the following quantity determines the direction of flow of heat?

What is the usual capactiy of an electric fuse used (i) in the lighting circuit, and (ii) in the power circuit, of a small house ?

What current will be taken by a 920 W appliance if the supply voltage is 230 V ?

Why does wet clothes appear to be darker than dry clothes?

As per the concept, we are able to see because the light gets reflected from the object and reach our eyes.but what when the light gets reflected but don't reach our eyes?

In the given circuit if point C is connected to the earth and a potential of +80 V is given to the point A, the potential at B is

An electric heater connected to a 220V lines has two resistance coils of 22 Ohms each. Calculate the current if these coils are used: a) Separately b) In Series c) In Parallel

Write an expression for the electrical power spent in flow of current through a conductor in terms of (a) resistance and potential difference (b) current and resistance.

which bulb will glow

Which is the major component of biogas?

Name and state the rule to find the direction of : (a) current induced in a coil due to its rotation in a magnetic field. (b) force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it.

When a 4Ω resistor is connected across the terminals of a 12 V battery, the number of coulombs passing through the resistor per second is: (a) 0.3 (b) 3 (c) 4 (d) 12

A dark muscular diaphragm that controls the size of the pupil is ______.

The graph, shown in the diagram, represents the variation of temperature (T) of the bodies, x and y having same surface area, with time (t) due to the emission of radiation. Find the correct relation between the emissivity and absorptivity power of the two bodies

The temperature required for the nuclear fusion is approximately.

Lets say if there was no atmosphere on the earth, would scattering of light happen even then?

The main fuse is connected in : (a) live wire (b) neutral wire (c) both the live and earth wires (d) both the earth and neutral wires.

In a PNP transistor working as a common-base amplifier, current gain is 0.96 and emitter current is 7.2 mA. The base current is

When 90Th228 transforms to 83Bi212, then the number of the emitted α -and β -particles is, respectively

A piece of wire with resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is R′, then the ratio RR′ is:

How can we identify that the height of the image we get is negative or positive?

Why in resistance in parallel has current in common?

A frontend loader applied 150 N of force to lift a stone,1250 joules of work was done. How far was the rock lifted?

Fill in the following blanks with suitable words : We can see the sun about ___ minutes before the actual sunrise and about ___ minutes after the actual sunset because of atmospheric ___

Two points have a potential difference of 10V. After connecting a conductor with zero resistance between the points,the final potential at each point becomes 25V. What could be their initial potentials?

Which gaseous fuel is being used increasingly in transport vehicles like cars and buses these days?

State any two properties of magnetic field lines.

With both eyes open, a person's field of view is about : (a) 90∘ (b) 150∘ (c) 180∘ (d) 360∘

In the given figure, there is a bi-focal lens, used to correct a presbyopic person, what is region 1 and 2?

A person cannot see the distant objects clearly (though he can see the nearby objects clearly). He is suffering from the defect of vision called : (a) cataract (b) hypermetropia (c) myopia (d) presbyopia

What happens to the pupil, if you see the sunlight directly?

When a magnet is brought close to a wire, the magnetic field around the wire ___.

The focal length of a convex lens is 25 cm. At what distance from the optical centre of the lens an object be placed to obtain a virtual image of twice the size ?

Optical fibres have ___ transparent layers of different refractive index.

A cut piece of diamond appears to sparkle much more than an identically cut piece of glass. Why?

The specific heat capacity of water is : (a) 4200 J kg−1 K−1 (b) 420 J kg−1 K−1 (c) 0.42 J g−1 K−1 (d) 4.2 J kg−1 K−1

Heat energy lost by a hot body is equal to heat energy gained by the cold body. Which of the following option/options below is/are associated with the above statement?

(a) Calculate the heat capacity of a copper vessel of mass 150 g if the specific heat capacity of copper is 410 J kg−1 K−1. (b) How much heat energy will be required to increase the temperature of the vessel in part(a) from 25∘C to 35∘C?

What is an electromagnet?How is it different from a permanent magnet?State two uses of electromagnet.

Due to gradual weakening of ciliary muscles and diminishing flexibility of the lens a certain defect of vision arises. Write the name of this defect . Name the type of lens required by such persons to remove the vision. Explain the structure and function of such a lens.

What do you mean by clockwise and anti-clockwise moment?

A current flows downwards in a wire that passes vertically through a table top. Will the magnetic field lines around it go clockwise or anticlockwise when viewed from above the table ?

Fill in the following blanks with suitable words : We can see the sun about _ minutes before the actual sunrise and about _ minutes after the actual sunset because of atmospheric ___