16569 + Interview Questions in Physics

1.	Light ray travels in a
Answer» Light ray travels in a

Discussion

2.	Magnetic field in the region decreases from 1 T to 0.5 T in 2 s. Find the average value of induced current in the loop, if its resistance is 23 Ω.
Answer» Magnetic field in the region decreases from $1 T$ to $0.5 T$ in $2 s$ . Find the average value of induced current in the loop, if its resistance is $\frac{2}{3} Ω$ .

Discussion

3.	why cloud is white in colour
Answer» why cloud is white in colour

Discussion

4.	If i will be vibrating at the frequency of light then is it so that ...all the particles in my body will be vibrating at the same frquency?
Answer» If i will be vibrating at the frequency of light then is it so that ...all the particles in my body will be vibrating at the same frquency?

Discussion

5.	If resistance of sorting of a wire is 1 ohm then the resistance of a similar nichrome wire will be about:? Please provide me with an answer
Answer» If resistance of sorting of a wire is 1 ohm then the resistance of a similar nichrome wire will be about:? Please provide me with an answer

Discussion

6.	What is electrolyte and non electrolyte
Answer» What is electrolyte and non electrolyte

Discussion

7.	Mass of 1 amu in gram
Answer» Mass of 1 amu in gram

Discussion

8.	The law of reflection, angle of incidence = angle of reflection can be deduced by which principle?
Answer» The law of reflection, angle of incidence = angle of reflection can be deduced by which principle?

Discussion

9.	For n moles of an ideal gas or real gas at moderate pressure which of the following relations are correct?C(p)and C(v) denote specific heat capacity at constant pressure and volume respectively.A)C(p)-C(v)=RB)C(p)-C(v)=nRC)C(p)-C(v)=R/nD)None of these are correct.
Answer» For n moles of an ideal gas or real gas at moderate pressure which of the following relations are correct?C(p)and C(v) denote specific heat capacity at constant pressure and volume respectively. A)C(p)-C(v)=R B)C(p)-C(v)=nR C)C(p)-C(v)=R/n D)None of these are correct.

Discussion

10.	(Dispersion by a Prism)(32.) Compare the dispersive powers of two prisms ifone of them deviates the blue and red rays through10 and 6^° respectively and the second prismthrough 8^° and 4.5(1) 0.69(2) 0.79(3) 0.89(4) 0.99anala 6^° madeof alass f refractive
Answer» (Dispersion by a Prism)(32.) Compare the dispersive powers of two prisms ifone of them deviates the blue and red rays through10 and 6^° respectively and the second prismthrough 8^° and 4.5(1) 0.69(2) 0.79(3) 0.89(4) 0.99anala 6^° madeof alass f refractive

Discussion

11.	Small steel balls fall from rest through the opening at a steady rate of 2 balls per second. The vertical separation h of two balls when the lower one has dropped 20 meter is?
Answer» Small steel balls fall from rest through the opening at a steady rate of 2 balls per second. The vertical separation h of two balls when the lower one has dropped 20 meter is?

Discussion

12.	What is an electric motor ? State its principle.
Answer» What is an electric motor ? State its principle.

Discussion

13.	Intensity inside hollow sphere is zero but inside ring is not zero?
Answer» Intensity inside hollow sphere is zero but inside ring is not zero?

Discussion

14.	A light ray falls on one of the faces of a prism at an angle 40 so that it suffers minimum deviation of 30 degrees. Find the angle of prism and angle of refraction at the given surface.
Answer» A light ray falls on one of the faces of a prism at an angle 40 so that it suffers minimum deviation of 30 degrees. Find the angle of prism and angle of refraction at the given surface.

Discussion

15.	What is the order of colours in a rainbow, from the outside to the inside ?
Answer» What is the order of colours in a rainbow, from the outside to the inside ?

Discussion

16.	A dentist's mirror has a radius of curvature of 3 cm. How far must it be placed from a small dental cavity to give a virtual image of the cavity that is magnified five times?
Answer» A dentist's mirror has a radius of curvature of 3 cm. How far must it be placed from a small dental cavity to give a virtual image of the cavity that is magnified five times?

Discussion

17.	Why the angle of deviation in prisms first decreases and then increases and besides this why the angle of deviation increases with the increase of angle of prism
Answer» Why the angle of deviation in prisms first decreases and then increases and besides this why the angle of deviation increases with the increase of angle of prism

Discussion

18.	In a hot cathode ray tube, what is the effect on the beam of particles if a hotter filament is used?
Answer» In a hot cathode ray tube, what is the effect on the beam of particles if a hotter filament is used?

Discussion

19.	Which mirror will you prefer to use as a rear view mirror in a car : plane mirror or convex mirror ? Give one reason.
Answer» Which mirror will you prefer to use as a rear view mirror in a car : plane mirror or convex mirror ? Give one reason.

Discussion

20.	If R is radius of earth and w is its angular velocity and g is the acceleration due to gravity at latitude =30 will be ____________
Answer» If R is radius of earth and w is its angular velocity and g is the acceleration due to gravity at latitude =30 will be ____________

Discussion

21.	12.Dipole dipole interaction energy between stationary polar molecules is proportional to 1/r 3 and that between the rotating polar molecules is proportional to 1/r 6 where r is the distance between the molecules . Explain what is stationary and rotating polar molecules.
Answer» 12.Dipole dipole interaction energy between stationary polar molecules is proportional to 1/r 3 and that between the rotating polar molecules is proportional to 1/r 6 where r is the distance between the molecules . Explain what is stationary and rotating polar molecules.

Discussion

22.	find enthalpy change when 1g of water is frozen at 0degree celcius (△_fH=1.435kcalmol^{-1})
Answer» find enthalpy change when 1g of water is frozen at 0degree celcius (△_fH=1.435kcalmol^{-1})

Discussion

23.	Please send me all the formulas used in solving problems of magnetic effect of electric current with their derivation.
Answer» Please send me all the formulas used in solving problems of magnetic effect of electric current with their derivation.

Discussion

24.	What do you mean by discharge with respect to a secondary cell?
Answer» What do you mean by discharge with respect to a secondary cell?

Discussion

25.	A cylindrical glass rod of radius 0.1 m and refractive index √3 lies on a horizontal plane mirror. A horizontal ray of light moving perpendicular to the axis of the rod is incident on it. At what centre to centre distance a second similar rod, parallel to the first, be placed on the mirror, such that the emergent ray from second rod is in line with the incident ray on the first rod and ray emerges from first rod at the height of 0.1 m from mirror ?
Answer» A cylindrical glass rod of radius $0.1 m$ and refractive index $\sqrt{3}$ lies on a horizontal plane mirror. A horizontal ray of light moving perpendicular to the axis of the rod is incident on it. At what centre to centre distance a second similar rod, parallel to the first, be placed on the mirror, such that the emergent ray from second rod is in line with the incident ray on the first rod and ray emerges from first rod at the height of $0.1 m$ from mirror ?

Discussion

26.	A meteorite approaching a planet of mass M (in the straight line passing through the centre of the planet) collides with an automatic space station orbiting the planet in a circular trajectory of radius R. The mass of the station is ten times as large as the mass of the meteorite. As a result of the collision, the meteorite sticks in the station which goes over to a new orbit the minimum distance R/2 from the planet. Speed of the meteorite just before it collides with the planet is:
Answer» A meteorite approaching a planet of mass $M$ (in the straight line passing through the centre of the planet) collides with an automatic space station orbiting the planet in a circular trajectory of radius $R$ . The mass of the station is ten times as large as the mass of the meteorite. As a result of the collision, the meteorite sticks in the station which goes over to a new orbit the minimum distance $R / 2$ from the planet. Speed of the meteorite just before it collides with the planet is:

Discussion

27.	Assertion: The focal length of objective lens in telescope is much more than that of eye piece. Reason: Telescope has high resolving power due tolarge focal length.
Answer» Assertion: The focal length of objective lens in telescope is much more than that of eye piece. Reason: Telescope has high resolving power due tolarge focal length.

Discussion

28.	Difference between centrifugal force and centripetal force
Answer» Difference between centrifugal force and centripetal force

Discussion

29.	The distance of distinct vision of a person is 50 cm. He wants to read a book placed at 25 cm. What should be the focal length of the spectacles?
Answer» The distance of distinct vision of a person is 50 cm. He wants to read a book placed at 25 cm. What should be the focal length of the spectacles?

Discussion

30.	A ray of light of wavelength 5400A∘ suffers refraction from air to glass. Taking aμg=32. Find the wavelength of light in glass.
Answer» A ray of light of wavelength $5400 A^{\circ}$ suffers refraction from air to glass. Taking $_{a} μ_{g} = \frac{3}{2}$ . Find the wavelength of light in glass.

Discussion

31.	Light is incident normally on face AB of a prism as shown in figure. A liquid of refractive index μ is placed on face AC of the prism. The prism is made of glass of refractive index 32. The limits of μ for which total internal reflection takes place on face AC is
Answer» Light is incident normally on face $A B$ of a prism as shown in figure. A liquid of refractive index $μ$ is placed on face $A C$ of the prism. The prism is made of glass of refractive index $\frac{3}{2}$ . The limits of $μ$ for which total internal reflection takes place on face $A C$ is

31.

Light is incident normally on face AB of a prism as shown in figure. A liquid of refractive index μ is placed on face AC of the prism. The prism is made of glass of refractive index 32. The limits of μ for which total internal reflection takes place on face AC is

Answer»

Light is incident normally on face $A B$ of a prism as shown in figure. A liquid of refractive index $μ$ is placed on face $A C$ of the prism. The prism is made of glass of refractive index $\frac{3}{2}$ . The limits of $μ$ for which total internal reflection takes place on face $A C$ is

Discussion

32.	why boiling point inversely proportional to vapour pressure
Answer» why boiling point inversely proportional to vapour pressure

Discussion

33.	A copper rod of length 1 m is moving at a uniform speed of 2.5 m/s parallel to a long straight wire carrying a current of 2 A as shown in the figure. Rod is perpendicular to the wire, with its ends at a distance of 1 m and 2 m from it. Calculate the emf induced (in volt) in the rod.
Answer» A copper rod of length $1 m$ is moving at a uniform speed of $2.5 m/s$ parallel to a long straight wire carrying a current of $2 A$ as shown in the figure. Rod is perpendicular to the wire, with its ends at a distance of $1 m$ and $2 m$ from it. Calculate the emf induced $(in volt)$ in the rod.

Discussion

34.	A balloon starting from rest ascendsvertically with uniform acceleration toheight of 100 m in 10 s. The force on thebottom of the balloon by a mass of 50 kg is(g 10 ms2)
Answer» A balloon starting from rest ascendsvertically with uniform acceleration toheight of 100 m in 10 s. The force on thebottom of the balloon by a mass of 50 kg is(g 10 ms2)

Discussion

35.	When light is incident on the surface of medium at angle i and refracted into a second medium at an angle r the graph of sin i vs sin r is as shown in the graph. From this, one can conclude that
Answer» When light is incident on the surface of medium at angle $i$ and refracted into a second medium at an angle $r$ the graph of $s i n i$ vs $s i n r$ is as shown in the graph. From this, one can conclude that

35.

When light is incident on the surface of medium at angle i and refracted into a second medium at an angle r the graph of sin i vs sin r is as shown in the graph. From this, one can conclude that

Answer»

When light is incident on the surface of medium at angle $i$ and refracted into a second medium at an angle $r$ the graph of $s i n i$ vs $s i n r$ is as shown in the graph. From this, one can conclude that

Discussion

36.	Question 32Draw an appropriate schematic diagram showing common domestic circuits and discuss the importance of fuse. Why is it that a burnt out fuse should be replaced by another fuse of identical rating?
Answer» Question 32 Draw an appropriate schematic diagram showing common domestic circuits and discuss the importance of fuse. Why is it that a burnt out fuse should be replaced by another fuse of identical rating?

Discussion

37.	What is the Coordination number of Iron in \lbrack Fe{(en)}_3\rbrack Cl_3?
Answer» What is the Coordination number of Iron in \lbrack Fe{(en)}_3\rbrack Cl_3?

Discussion

38.	If the angle of prism is 60^° and angle of minimum deviation is 40^°, the angle of refraction of first refracting surface of prism will be
Answer» If the angle of prism is 60^° and angle of minimum deviation is 40^°, the angle of refraction of first refracting surface of prism will be

Discussion

39.	Pump Motor is used to deliver water at certain rate from a given pipe to obtain twice as much water from same pipe in given time power of motor has to be increased
Answer» Pump Motor is used to deliver water at certain rate from a given pipe to obtain twice as much water from same pipe in given time power of motor has to be increased

Discussion

40.	what is the frequency of AC Generator?
Answer» what is the frequency of AC Generator?

Discussion

41.	Question 21Khadins, Bundhis, Ahars and Kattas are ancient structures that are examples for(a) grain storage(b) wood storage(c) water harvesting(d) soil conservation
Answer» Question 21 Khadins, Bundhis, Ahars and Kattas are ancient structures that are examples for (a) grain storage (b) wood storage (c) water harvesting (d) soil conservation

Discussion

42.	2 kg of ice at −20∘C is mixed with 5 kg of water at 20∘C in an insulating vessel having a negligible heat capacity. Calculate the final mass of water remaining in the container. It is given that the specific heats of water and ice are 1 kcalkg−1∘C−1 and 0.5 kcalkg−1∘C−1 while the latent heat of fusion of ice is 80 kcal/kg.
Answer» $2 kg$ of ice at $- 20^{\circ} C$ is mixed with $5 kg$ of water at $20^{\circ} C$ in an insulating vessel having a negligible heat capacity. Calculate the final mass of water remaining in the container. It is given that the specific heats of water and ice are $1 kcal {kg}^{- 1} {^{\circ} C}^{- 1}$ and $0.5 kcal {kg}^{- 1} {^{\circ} C}^{- 1}$ while the latent heat of fusion of ice is $80 kcal/kg$ .

Discussion

43.	What is the gait of animals?
Answer» What is the gait of animals?

Discussion

44.	90g of water spilled out from a vessel in the room on the floor . assume that water vapour behaving as an ideal gas, calculate the internal energy change when the spilled water undergoes complete evaporation at 100^° C( molar heat of water=41K J mol∧1
Answer» 90g of water spilled out from a vessel in the room on the floor . assume that water vapour behaving as an ideal gas, calculate the internal energy change when the spilled water undergoes complete evaporation at 100^° C( molar heat of water=41K J mol∧1

Discussion

45.	Which part of the mirror reflects the light?
Answer» Which part of the mirror reflects the light?

Discussion

46.	The Wedding-Guest beat his breast because………… i. he could hear the sound of the bassoon ii. he was forced to listen to the Mariner's tale when he wanted to attend the wedding iii. the sound of the bassoon meant that the bride had arrived and the wedding ceremony was about to begin and he could not attend it. iv. the sound of the bassoon announced the arrival of the bride and the start of the wedding ceremony
Answer» The Wedding-Guest beat his breast because………… i. he could hear the sound of the bassoon ii. he was forced to listen to the Mariner's tale when he wanted to attend the wedding iii. the sound of the bassoon meant that the bride had arrived and the wedding ceremony was about to begin and he could not attend it. iv. the sound of the bassoon announced the arrival of the bride and the start of the wedding ceremony

46.

The Wedding-Guest beat his breast because………… i. he could hear the sound of the bassoon ii. he was forced to listen to the Mariner's tale when he wanted to attend the wedding iii. the sound of the bassoon meant that the bride had arrived and the wedding ceremony was about to begin and he could not attend it. iv. the sound of the bassoon announced the arrival of the bride and the start of the wedding ceremony

Answer»

The
Wedding-Guest beat his breast because…………

i.
he could hear the sound of the bassoon

ii.
he was forced to listen to the Mariner's tale when he wanted to
attend the wedding

iii.
the sound of the bassoon meant that the bride had arrived and the
wedding ceremony was about to begin and he could not attend it.

iv.
the sound of the bassoon announced the arrival of the bride and the
start of the wedding ceremony

Discussion

47.	In the figure given below, a coil is placed between two permanent magnets and it rotated with the help of an axle on which two rings R1 and R2 are internally attached. B1 and B2 represent metallic brushes. G represents galvanometer. As the coil starts to rotate, the current flows through ABCD as shown. The coil starts rotation in:
Answer» In the figure given below, a coil is placed between two permanent magnets and it rotated with the help of an axle on which two rings R1 and R2 are internally attached. B1 and B2 represent metallic brushes. G represents galvanometer. As the coil starts to rotate, the current flows through ABCD as shown. The coil starts rotation in:

47.

In the figure given below, a coil is placed between two permanent magnets and it rotated with the help of an axle on which two rings R1 and R2 are internally attached. B1 and B2 represent metallic brushes. G represents galvanometer. As the coil starts to rotate, the current flows through ABCD as shown. The coil starts rotation in:

Answer»

In the figure given below, a coil is placed between two permanent magnets and it rotated with the help of an axle on which two rings R1 and R2 are internally attached. B1 and B2 represent metallic brushes. G represents galvanometer.

As the coil starts to rotate, the current flows through ABCD as shown. The coil starts rotation in:

Discussion

48.	Electra has trouble finding the correct Nernst equation for the cell Zn(s)\|Zn2+\|\|Cu2+\|Cu(s) at 25∘C Can you help her?
Answer» Electra has trouble finding the correct Nernst equation for the cell $Z n (s) \| Z n^{2 +} \| \| C u^{2 +} \| C u (s) a t 25^{\circ} C$ Can you help her?

Discussion

49.	An electric charge 2×10−8 C is placed at the point (1, 2, 4) m. The electric potential at the point (4, 2, 0) m will be
Answer» An electric charge $2 \times 10^{- 8} C$ is placed at the point $(1, 2, 4) m$ . The electric potential at the point $(4, 2, 0) m$ will be

Discussion

50.	Out of an A.C . generator and a D.C. generator: (a) which one uses a commutator (split rings) ? (b) which on uses slip rings ?
Answer» Out of an A.C . generator and a D.C. generator: (a) which one uses a commutator (split rings) ? (b) which on uses slip rings ?

50.

Out of an A.C . generator and a D.C. generator: (a) which one uses a commutator (split rings) ? (b) which on uses slip rings ?

Answer»

Out of an A.C . generator and a D.C. generator:

(a) which one uses a commutator (split rings) ?

(b) which on uses slip rings ?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Light ray travels in a

Magnetic field in the region decreases from 1 T to 0.5 T in 2 s. Find the average value of induced current in the loop, if its resistance is 23 Ω.

why cloud is white in colour

If i will be vibrating at the frequency of light then is it so that ...all the particles in my body will be vibrating at the same frquency?

If resistance of sorting of a wire is 1 ohm then the resistance of a similar nichrome wire will be about:? Please provide me with an answer

What is electrolyte and non electrolyte

Mass of 1 amu in gram

The law of reflection, angle of incidence = angle of reflection can be deduced by which principle?

For n moles of an ideal gas or real gas at moderate pressure which of the following relations are correct?C(p)and C(v) denote specific heat capacity at constant pressure and volume respectively.A)C(p)-C(v)=RB)C(p)-C(v)=nRC)C(p)-C(v)=R/nD)None of these are correct.

(Dispersion by a Prism)(32.) Compare the dispersive powers of two prisms ifone of them deviates the blue and red rays through10 and 6^° respectively and the second prismthrough 8^° and 4.5(1) 0.69(2) 0.79(3) 0.89(4) 0.99anala 6^° madeof alass f refractive

Small steel balls fall from rest through the opening at a steady rate of 2 balls per second. The vertical separation h of two balls when the lower one has dropped 20 meter is?

What is an electric motor ? State its principle.

Intensity inside hollow sphere is zero but inside ring is not zero?

A light ray falls on one of the faces of a prism at an angle 40 so that it suffers minimum deviation of 30 degrees. Find the angle of prism and angle of refraction at the given surface.

What is the order of colours in a rainbow, from the outside to the inside ?

A dentist's mirror has a radius of curvature of 3 cm. How far must it be placed from a small dental cavity to give a virtual image of the cavity that is magnified five times?

Why the angle of deviation in prisms first decreases and then increases and besides this why the angle of deviation increases with the increase of angle of prism

In a hot cathode ray tube, what is the effect on the beam of particles if a hotter filament is used?

Which mirror will you prefer to use as a rear view mirror in a car : plane mirror or convex mirror ? Give one reason.

If R is radius of earth and w is its angular velocity and g is the acceleration due to gravity at latitude =30 will be ____________

12.Dipole dipole interaction energy between stationary polar molecules is proportional to 1/r 3 and that between the rotating polar molecules is proportional to 1/r 6 where r is the distance between the molecules . Explain what is stationary and rotating polar molecules.

find enthalpy change when 1g of water is frozen at 0degree celcius (△_fH=1.435kcalmol^{-1})

Please send me all the formulas used in solving problems of magnetic effect of electric current with their derivation.

What do you mean by discharge with respect to a secondary cell?

Assertion: The focal length of objective lens in telescope is much more than that of eye piece. Reason: Telescope has high resolving power due tolarge focal length.

Difference between centrifugal force and centripetal force

The distance of distinct vision of a person is 50 cm. He wants to read a book placed at 25 cm. What should be the focal length of the spectacles?

A ray of light of wavelength 5400A∘ suffers refraction from air to glass. Taking aμg=32. Find the wavelength of light in glass.

Light is incident normally on face AB of a prism as shown in figure. A liquid of refractive index μ is placed on face AC of the prism. The prism is made of glass of refractive index 32. The limits of μ for which total internal reflection takes place on face AC is

why boiling point inversely proportional to vapour pressure

A copper rod of length 1 m is moving at a uniform speed of 2.5 m/s parallel to a long straight wire carrying a current of 2 A as shown in the figure. Rod is perpendicular to the wire, with its ends at a distance of 1 m and 2 m from it. Calculate the emf induced (in volt) in the rod.

A balloon starting from rest ascendsvertically with uniform acceleration toheight of 100 m in 10 s. The force on thebottom of the balloon by a mass of 50 kg is(g 10 ms2)

When light is incident on the surface of medium at angle i and refracted into a second medium at an angle r the graph of sin i vs sin r is as shown in the graph. From this, one can conclude that

Question 32Draw an appropriate schematic diagram showing common domestic circuits and discuss the importance of fuse. Why is it that a burnt out fuse should be replaced by another fuse of identical rating?

What is the Coordination number of Iron in \lbrack Fe{(en)}_3\rbrack Cl_3?

If the angle of prism is 60^° and angle of minimum deviation is 40^°, the angle of refraction of first refracting surface of prism will be

Pump Motor is used to deliver water at certain rate from a given pipe to obtain twice as much water from same pipe in given time power of motor has to be increased

what is the frequency of AC Generator?

Question 21Khadins, Bundhis, Ahars and Kattas are ancient structures that are examples for(a) grain storage(b) wood storage(c) water harvesting(d) soil conservation

What is the gait of animals?

90g of water spilled out from a vessel in the room on the floor . assume that water vapour behaving as an ideal gas, calculate the internal energy change when the spilled water undergoes complete evaporation at 100^° C( molar heat of water=41K J mol∧1

Which part of the mirror reflects the light?

Electra has trouble finding the correct Nernst equation for the cell Zn(s)|Zn2+||Cu2+|Cu(s) at 25∘C Can you help her?

An electric charge 2×10−8 C is placed at the point (1, 2, 4) m. The electric potential at the point (4, 2, 0) m will be

Out of an A.C . generator and a D.C. generator: (a) which one uses a commutator (split rings) ? (b) which on uses slip rings ?