16569 + Interview Questions in Physics

1.	A ray of light is incident on a glass sphere from water as shown. If μglass=32 and μwater=43. The angle of incidence so that the ray which enters the sphere does not come out of the sphere is
Answer» A ray of light is incident on a glass sphere from water as shown. If $μ_{glass = \frac{3}{2}}$ and $μ_{water = \frac{4}{3}}$ . The angle of incidence so that the ray which enters the sphere does not come out of the sphere is

1.

A ray of light is incident on a glass sphere from water as shown. If μglass=32 and μwater=43. The angle of incidence so that the ray which enters the sphere does not come out of the sphere is

Answer»

A ray of light is incident on a glass sphere from water as shown. If $μ_{glass = \frac{3}{2}}$ and $μ_{water = \frac{4}{3}}$ . The angle of incidence so that the ray which enters the sphere does not come out of the sphere is

Discussion

2.	State whether work is done or not by writing yes or no, in the following cases: (a) A man pushes a wall. (b) A coolie stands with a box on his head for 15 min. (c) A boy climbs up 20 stairs.
Answer» State whether work is done or not by writing yes or no, in the following cases: (a) A man pushes a wall. (b) A coolie stands with a box on his head for 15 min. (c) A boy climbs up 20 stairs.

2.

State whether work is done or not by writing yes or no, in the following cases: (a) A man pushes a wall. (b) A coolie stands with a box on his head for 15 min. (c) A boy climbs up 20 stairs.

Answer»

State whether work is done or not by writing yes or no, in the following cases:

(a) A man pushes a wall.

(b) A coolie stands with a box on his head for 15 min.

(c) A boy climbs up 20 stairs.

Discussion

3.	Two resistors A and B resistance 4 Ω and 6Ω respectively are connected in parallel. The combination is connected across a 6 volt battery of negligible resistance. Calculate : (i) the power supplied by the battery, and (ii) the power dissipated in each resistor.
Answer» Two resistors A and B resistance 4 $Ω a n d 6 Ω$ respectively are connected in parallel. The combination is connected across a 6 volt battery of negligible resistance. Calculate : (i) the power supplied by the battery, and (ii) the power dissipated in each resistor.

Discussion

4.	what are solenoids?
Answer» what are solenoids?

Discussion

5.	A pair of scissors has its blades 10 cm long, while its handles are 5 cm long. Find its mechanical advantage?0.5
Answer» A pair of scissors has its blades 10 cm long, while its handles are 5 cm long. Find its mechanical advantage? 0.5

Discussion

6.	A thin double convex lens has radii of curvature each of magnitude 40 cm and is made of glass with refractive index 1.65. Its focal length is nearly ___ cm.
Answer» A thin double convex lens has radii of curvature each of magnitude 40 cm and is made of glass with refractive index 1.65. Its focal length is nearly ___ cm.

Discussion

7.	Water has high heat of vaporisation due to ___ .
Answer» Water has high heat of vaporisation due to ___ .

Discussion

8.	Question 171 The diameter of the Sun is 1.4×109m and the diameter of the Earth is 1.2756×107 m. Compare their diameters by division.
Answer» Question 171 The diameter of the Sun is $1.4 \times 10^{9}$ m and the diameter of the Earth is $1.2756 \times 10^{7}$ m. Compare their diameters by division.

8.

Question 171 The diameter of the Sun is 1.4×109m and the diameter of the Earth is 1.2756×107 m. Compare their diameters by division.

Answer»

Question 171

The diameter of the Sun is $1.4 \times 10^{9}$ m and the diameter of the Earth is $1.2756 \times 10^{7}$ m. Compare their diameters by division.

Discussion

9.	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 the planet and the star is proportional to R−52 then:
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 the planet and the star is proportional to $R^{\frac{- 5}{2}}$ then:

Discussion

10.	in experiment 13.9 why does the galvanometer in coil 2 deflect?
Answer» in experiment 13.9 why does the galvanometer in coil 2 deflect?

Discussion

11.	If a wire is dropped freely towards Earth will an EMF induced across the ends of wire if the wire is initially in (a) north south direction ,(b) east west direction ?
Answer» If a wire is dropped freely towards Earth will an EMF induced across the ends of wire if the wire is initially in (a) north south direction ,(b) east west direction ?

Discussion

12.	An electron is moving perpendicular to a magnetic field of strength 0.55 T. Calculate the approximate time period of the electron in the field. Take the mass of the electron me=9.1×10−31 kg and its charge e=1.6×10−19 C.
Answer» An electron is moving perpendicular to a magnetic field of strength $0.55 T$ . Calculate the approximate time period of the electron in the field. Take the mass of the electron $m_{e} = 9.1 \times 10^{- 31} k g$ and its charge $e = 1.6 \times 10^{- 19} C$ .

Discussion

13.	The letter F is placed in front of a plane mirror : (a) How would its image look like when seen in a plane mirror ? (b) What is the name of the phenomenon involved ?
Answer» The letter F is placed in front of a plane mirror : (a) How would its image look like when seen in a plane mirror ? (b) What is the name of the phenomenon involved ?

Discussion

14.	The binding energy of deuteron (21H) is 1.15 MeV per nucleon and an alpha particle (42He) has a binding energy of 7.1 MeV per nucleon. Then in the reaction 21H+21H→42He+Q the energy Q released is
Answer» The binding energy of deuteron $(_{1}^{2} H)$ is 1.15 MeV per nucleon and an alpha particle $(_{2}^{4} H e)$ has a binding energy of 7.1 MeV per nucleon. Then in the reaction $_{1}^{2} H +_{1}^{2} H \to_{2}^{4} H e + Q$ the energy Q released is

Discussion

15.	A ray light is incident at the glass-water interface at an angle i, it merges finally parallel to the surface of water, then the value of μg would be
Answer» A ray light is incident at the glass-water interface at an angle i, it merges finally parallel to the surface of water, then the value of $μ_{g}$ would be

Discussion

16.	which physical quantity does electron volt measure ? How it is related to si unit of quantity?
Answer» which physical quantity does electron volt measure ? How it is related to si unit of quantity?

Discussion

17.	A ray of light enters a glass slab PQRS, as shown in the diagram. The critical angle of the glass is 42°. What will happen to light when it strikes surface PQ?
Answer» A ray of light enters a glass slab PQRS, as shown in the diagram. The critical angle of the glass is 42°. What will happen to light when it strikes surface PQ?

17.

A ray of light enters a glass slab PQRS, as shown in the diagram. The critical angle of the glass is 42°. What will happen to light when it strikes surface PQ?

Answer»

A ray of light enters a glass slab PQRS, as shown in the diagram. The critical angle of the glass is 42°. What will happen to light when it strikes surface PQ?

Discussion

18.	The Constitution of India was amended in 1992 to make the third-tier of democracy more effective. As a result, at least one-third of all positions in the local bodies is reserved for women. This is because
Answer» The Constitution of India was amended in 1992 to make the third-tier of democracy more effective. As a result, at least one-third of all positions in the local bodies is reserved for women. This is because

Discussion

19.	what is the differenc ebetween voltage and electrical potential ? is voltage and potential are same ?
Answer» what is the differenc ebetween voltage and electrical potential ? is voltage and potential are same ?

Discussion

20.	Explain magnetic effects of electric current briefly ( whole chapter )
Answer» Explain magnetic effects of electric current briefly ( whole chapter )

20.

Explain magnetic effects of electric current briefly ( whole chapter )

Answer»

Explain magnetic effects of electric current briefly

( whole chapter )

Discussion

21.	If we keep a magnet on a sheet which has iron fillings and if we shake the paper,how can iron fillings arrange in a patron of magnetic field. The iron fillings should have been stick to the magnet
Answer» If we keep a magnet on a sheet which has iron fillings and if we shake the paper,how can iron fillings arrange in a patron of magnetic field. The iron fillings should have been stick to the magnet

Discussion

22.	Magnets like everything are made up of atoms. So why they do behave differently in case of attracting or repelling one another as well as in attracting iron?
Answer» Magnets like everything are made up of atoms. So why they do behave differently in case of attracting or repelling one another as well as in attracting iron?

Discussion

23.	A candle 2.5cm in size is placed in front of a concave mirror with radius of curvature 36cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image?
Answer» A candle 2.5cm in size is placed in front of a concave mirror with radius of curvature 36cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image?

Discussion

24.	A coil made of insulated copper wire is connected to a galvanometer. What would happen in following cases? i) A bar magnet is inserted and removed from the coil. ii) A bar magnet is held stationary inside the coil.
Answer» A coil made of insulated copper wire is connected to a galvanometer. What would happen in following cases? i) A bar magnet is inserted and removed from the coil. ii) A bar magnet is held stationary inside the coil.

Discussion

25.	(a) Name a device which helps to maintain potential difference across a conductor (say, a bulb). (b) If a potential difference of 10 V causes a current of 2 A to flow for 1 minute, how much energy is transferred?
Answer» (a) Name a device which helps to maintain potential difference across a conductor (say, a bulb). (b) If a potential difference of 10 V causes a current of 2 A to flow for 1 minute, how much energy is transferred?

Discussion

26.	A rigid body is said to be in mechanical equilibrium if
Answer» A rigid body is said to be in mechanical equilibrium if

Discussion

27.	Faraday's law is the consequence of what?
Answer» Faraday's law is the consequence of what?

Discussion

28.	defination of RESONANCE IN BRIEF
Answer» defination of RESONANCE IN BRIEF

Discussion

29.	Define enzymes
Answer» Define enzymes

Discussion

30.	A small bulb is placed at the bottom of a tank containing water to a depth of 80 cm.what is the area of the surface of water through which light from the bulb can emerge out? Refractive index of water is 1.33. Consider the bulb to be a point source.
Answer» A small bulb is placed at the bottom of a tank containing water to a depth of 80 cm.what is the area of the surface of water through which light from the bulb can emerge out? Refractive index of water is 1.33. Consider the bulb to be a point source.

Discussion

31.	A resistor has a resistance of 176 ohms . How many of these resistors should be connected in parallel so that their combination draws a current of 5 amperes from a 220volt supply line ?
Answer» A resistor has a resistance of 176 ohms . How many of these resistors should be connected in parallel so that their combination draws a current of 5 amperes from a 220volt supply line ?

Discussion

32.	The continuous process by which water is circulated throughout the earth and the atmosphere through evaporation, condensation, precipitation, and the transpiration of plants and animals is known as ___.
Answer» The continuous process by which water is circulated throughout the earth and the atmosphere through evaporation, condensation, precipitation, and the transpiration of plants and animals is known as ___.

Discussion

33.	A straight wire conductor passes vertically through a piece of cardboard sprinkled with iron filings. A current is passed through the wire in the upward direction and the cardboard is tapped gently. The following diagram shows the arrows that represent the direction of the magnetic field lines Name the law you will use to find the direction of the magnetic field lines.
Answer» A straight wire conductor passes vertically through a piece of cardboard sprinkled with iron filings. A current is passed through the wire in the upward direction and the cardboard is tapped gently. The following diagram shows the arrows that represent the direction of the magnetic field lines Name the law you will use to find the direction of the magnetic field lines.

33.

A straight wire conductor passes vertically through a piece of cardboard sprinkled with iron filings. A current is passed through the wire in the upward direction and the cardboard is tapped gently. The following diagram shows the arrows that represent the direction of the magnetic field lines Name the law you will use to find the direction of the magnetic field lines.

Answer»

A straight wire conductor passes vertically through a piece of cardboard sprinkled with iron filings. A current is passed through the wire in the upward direction and the cardboard is tapped gently.

The following diagram shows the arrows that represent the direction of the magnetic field lines

Name the law you will use to find the direction of the magnetic field lines.

Discussion

34.	The energy changes in an oscillating pendulum is
Answer» The energy changes in an oscillating pendulum is

Discussion

35.	In an experiment to study the scattering of light by passing a beam of white light through a colloidal solution of sulphur in a transparent glass tank : (a) Which colour is observed from the front of the glass tank ? Does this colour correspond to the colour of sky on a clear day or the colour of sky around the sun at sunset ? (b) Which colour is observed from the sides of the glass tank ? Does this colour correspond to the colour of sky on a clear day or the colour of sky around the sun at sunset ?
Answer» In an experiment to study the scattering of light by passing a beam of white light through a colloidal solution of sulphur in a transparent glass tank : (a) Which colour is observed from the front of the glass tank ? Does this colour correspond to the colour of sky on a clear day or the colour of sky around the sun at sunset ? (b) Which colour is observed from the sides of the glass tank ? Does this colour correspond to the colour of sky on a clear day or the colour of sky around the sun at sunset ?

Discussion

36.	Explain nuclear fusion in brief.
Answer» Explain nuclear fusion in brief.

Discussion

37.	The central portion of a lens is wrapped in black paper as shown below. An object is placed at 90 cm with the centre of curvature at 40 cm. Find the number of images formed.
Answer» The central portion of a lens is wrapped in black paper as shown below. An object is placed at 90 cm with the centre of curvature at 40 cm. Find the number of images formed.

37.

The central portion of a lens is wrapped in black paper as shown below. An object is placed at 90 cm with the centre of curvature at 40 cm. Find the number of images formed.

Answer»

The central portion of a lens is wrapped in black paper as shown below. An object is placed at 90 cm with the centre of curvature at 40 cm. Find the number of images formed.

Discussion

38.	How the focal length of a convex lens of glass affected if i) lens is placed in water ii) lens is placed in a liquid of larger refractive index than glass iii) lens becomes thicker at middle
Answer» How the focal length of a convex lens of glass affected if i) lens is placed in water ii) lens is placed in a liquid of larger refractive index than glass iii) lens becomes thicker at middle

Discussion

39.	The magnetic field line passing through the centre of a circular current carrying conductor is a
Answer» The magnetic field line passing through the centre of a circular current carrying conductor is a

Discussion

40.	Complete the following sentences : (i) The S.I. unit of moment of force is ___. (ii) In equilibrium, algebraic sum of moments of all forces about the point of rotation is ___ . (iii) In a beam balance when the beam is balanced in a horizontal position, it is in ___ equilibrium. (iv) The moon revolving around the earth is in ___ equilibrium.
Answer» Complete the following sentences : (i) The S.I. unit of moment of force is ___. (ii) In equilibrium, algebraic sum of moments of all forces about the point of rotation is ___ . (iii) In a beam balance when the beam is balanced in a horizontal position, it is in ___ equilibrium. (iv) The moon revolving around the earth is in ___ equilibrium.

40.

Complete the following sentences : (i) The S.I. unit of moment of force is _. (ii) In equilibrium, algebraic sum of moments of all forces about the point of rotation is _ . (iii) In a beam balance when the beam is balanced in a horizontal position, it is in _ equilibrium. (iv) The moon revolving around the earth is in _ equilibrium.

Answer»

Complete the following sentences :

(i) The S.I. unit of moment of force is ___.

(ii) In equilibrium, algebraic sum of moments of all forces about the point of rotation is ___ .

(iii) In a beam balance when the beam is balanced in a horizontal position, it is in ___ equilibrium.

(iv) The moon revolving around the earth is in ___ equilibrium.

Discussion

41.	If the direction of electric current in a solenoid when viewed from a particular end is anticlockwise, then this end of solenoid will be : (a) west pole (b) south pole (c) south pole (d) west pole
Answer» If the direction of electric current in a solenoid when viewed from a particular end is anticlockwise, then this end of solenoid will be : (a) west pole (b) south pole (c) south pole (d) west pole

41.

If the direction of electric current in a solenoid when viewed from a particular end is anticlockwise, then this end of solenoid will be : (a) west pole (b) south pole (c) south pole (d) west pole

Answer»

If the direction of electric current in a solenoid when viewed from a particular end is anticlockwise, then this end of solenoid will be :

(a) west pole (b) south pole (c) south pole (d) west pole

Discussion

42.	What is the persistence of human eye in seconds?.
Answer» What is the persistence of human eye in seconds?.

Discussion

43.	Specific heat capacity of water is 4.2 J/g0C & Specific heat capacity of mercury is 0.42 J/g0C. 4.2 J of heat is supplied to 1 g each of them. What will be the rise in temperature of each of them?
Answer» Specific heat capacity of water is 4.2 J/g⁰C & Specific heat capacity of mercury is 0.42 J/g⁰C. 4.2 J of heat is supplied to 1 g each of them. What will be the rise in temperature of each of them?

Discussion

44.	What do the ciliary muscles do when you are focusing on a nearby object ?
Answer» What do the ciliary muscles do when you are focusing on a nearby object ?

Discussion

45.	A current through a horizontal power line flows in the east to west direction. What is the direction of magnetic field at a point directly below it and at a point directly above it?
Answer» A current through a horizontal power line flows in the east to west direction. What is the direction of magnetic field at a point directly below it and at a point directly above it?

Discussion

46.	Sunset is red because at that time the light coming from the sun has to travel : (a) lesser thickness of earth's atmosphere (b) greater thickness of earth's atmosphere (c) varying thickness of earth's atmosphere (d) along the horizon
Answer» Sunset is red because at that time the light coming from the sun has to travel : (a) lesser thickness of earth's atmosphere (b) greater thickness of earth's atmosphere (c) varying thickness of earth's atmosphere (d) along the horizon

Discussion

47.	If a metallic wire of resistance R is melted and recast to half of its length, the new resistance of the wire will be?
Answer» If a metallic wire of resistance $R$ is melted and recast to half of its length, the new resistance of the wire will be?

Discussion

48.	Select the renewable and non-renewable sources of energy from the following : (a) Coal (b) Wood (c) Water (d) Diesel (e) Wind (f) Oil
Answer» Select the renewable and non-renewable sources of energy from the following : (a) Coal (b) Wood (c) Water (d) Diesel (e) Wind (f) Oil

48.

Select the renewable and non-renewable sources of energy from the following : (a) Coal (b) Wood (c) Water (d) Diesel (e) Wind (f) Oil

Answer»

Select the renewable and non-renewable sources of energy from the following :

(a) Coal (b) Wood (c) Water

(d) Diesel (e) Wind (f) Oil

Discussion

49.	A young man has to hold a book at arm's length to be able to read it clearly. The defect of vision is : (a) astigmatism (b) myopia (c) presbyopia (d) hypermetropia
Answer» A young man has to hold a book at arm's length to be able to read it clearly. The defect of vision is : (a) astigmatism (b) myopia (c) presbyopia (d) hypermetropia

Discussion

50.	What is the least distance of distinct vision for a normal human eye ?
Answer» What is the least distance of distinct vision for a normal human eye ?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A ray of light is incident on a glass sphere from water as shown. If μglass=32 and μwater=43. The angle of incidence so that the ray which enters the sphere does not come out of the sphere is

State whether work is done or not by writing yes or no, in the following cases: (a) A man pushes a wall. (b) A coolie stands with a box on his head for 15 min. (c) A boy climbs up 20 stairs.

Two resistors A and B resistance 4 Ω and 6Ω respectively are connected in parallel. The combination is connected across a 6 volt battery of negligible resistance. Calculate : (i) the power supplied by the battery, and (ii) the power dissipated in each resistor.

what are solenoids?

A pair of scissors has its blades 10 cm long, while its handles are 5 cm long. Find its mechanical advantage?0.5

A thin double convex lens has radii of curvature each of magnitude 40 cm and is made of glass with refractive index 1.65. Its focal length is nearly ___ cm.

Water has high heat of vaporisation due to ___ .

Question 171 The diameter of the Sun is 1.4×109m and the diameter of the Earth is 1.2756×107 m. Compare their diameters by division.

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 the planet and the star is proportional to R−52 then:

in experiment 13.9 why does the galvanometer in coil 2 deflect?

If a wire is dropped freely towards Earth will an EMF induced across the ends of wire if the wire is initially in (a) north south direction ,(b) east west direction ?

An electron is moving perpendicular to a magnetic field of strength 0.55 T. Calculate the approximate time period of the electron in the field. Take the mass of the electron me=9.1×10−31 kg and its charge e=1.6×10−19 C.

The letter F is placed in front of a plane mirror : (a) How would its image look like when seen in a plane mirror ? (b) What is the name of the phenomenon involved ?

The binding energy of deuteron (21H) is 1.15 MeV per nucleon and an alpha particle (42He) has a binding energy of 7.1 MeV per nucleon. Then in the reaction 21H+21H→42He+Q the energy Q released is

A ray light is incident at the glass-water interface at an angle i, it merges finally parallel to the surface of water, then the value of μg would be

which physical quantity does electron volt measure ? How it is related to si unit of quantity?

A ray of light enters a glass slab PQRS, as shown in the diagram. The critical angle of the glass is 42°. What will happen to light when it strikes surface PQ?

The Constitution of India was amended in 1992 to make the third-tier of democracy more effective. As a result, at least one-third of all positions in the local bodies is reserved for women. This is because

what is the differenc ebetween voltage and electrical potential ? is voltage and potential are same ?

Explain magnetic effects of electric current briefly ( whole chapter )

If we keep a magnet on a sheet which has iron fillings and if we shake the paper,how can iron fillings arrange in a patron of magnetic field. The iron fillings should have been stick to the magnet

Magnets like everything are made up of atoms. So why they do behave differently in case of attracting or repelling one another as well as in attracting iron?

A candle 2.5cm in size is placed in front of a concave mirror with radius of curvature 36cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image?

A coil made of insulated copper wire is connected to a galvanometer. What would happen in following cases? i) A bar magnet is inserted and removed from the coil. ii) A bar magnet is held stationary inside the coil.

(a) Name a device which helps to maintain potential difference across a conductor (say, a bulb). (b) If a potential difference of 10 V causes a current of 2 A to flow for 1 minute, how much energy is transferred?

A rigid body is said to be in mechanical equilibrium if

Faraday's law is the consequence of what?

defination of RESONANCE IN BRIEF

Define enzymes

A small bulb is placed at the bottom of a tank containing water to a depth of 80 cm.what is the area of the surface of water through which light from the bulb can emerge out? Refractive index of water is 1.33. Consider the bulb to be a point source.

A resistor has a resistance of 176 ohms . How many of these resistors should be connected in parallel so that their combination draws a current of 5 amperes from a 220volt supply line ?

The continuous process by which water is circulated throughout the earth and the atmosphere through evaporation, condensation, precipitation, and the transpiration of plants and animals is known as ___.

The energy changes in an oscillating pendulum is

Explain nuclear fusion in brief.

The central portion of a lens is wrapped in black paper as shown below. An object is placed at 90 cm with the centre of curvature at 40 cm. Find the number of images formed.

How the focal length of a convex lens of glass affected if i) lens is placed in water ii) lens is placed in a liquid of larger refractive index than glass iii) lens becomes thicker at middle

The magnetic field line passing through the centre of a circular current carrying conductor is a

If the direction of electric current in a solenoid when viewed from a particular end is anticlockwise, then this end of solenoid will be : (a) west pole (b) south pole (c) south pole (d) west pole

What is the persistence of human eye in seconds?.

Specific heat capacity of water is 4.2 J/g0C &amp; Specific heat capacity of mercury is 0.42 J/g0C. 4.2 J of heat is supplied to 1 g each of them. What will be the rise in temperature of each of them?

What do the ciliary muscles do when you are focusing on a nearby object ?

A current through a horizontal power line flows in the east to west direction. What is the direction of magnetic field at a point directly below it and at a point directly above it?

Sunset is red because at that time the light coming from the sun has to travel : (a) lesser thickness of earth's atmosphere (b) greater thickness of earth's atmosphere (c) varying thickness of earth's atmosphere (d) along the horizon

If a metallic wire of resistance R is melted and recast to half of its length, the new resistance of the wire will be?

Select the renewable and non-renewable sources of energy from the following : (a) Coal (b) Wood (c) Water (d) Diesel (e) Wind (f) Oil

A young man has to hold a book at arm's length to be able to read it clearly. The defect of vision is : (a) astigmatism (b) myopia (c) presbyopia (d) hypermetropia

What is the least distance of distinct vision for a normal human eye ?

Specific heat capacity of water is 4.2 J/g0C & Specific heat capacity of mercury is 0.42 J/g0C. 4.2 J of heat is supplied to 1 g each of them. What will be the rise in temperature of each of them?