16569 + Interview Questions in Physics

1.	If there are 10 minor divisions between two major divisions, one major division representing 1∘C, one minor division will be equal to
Answer» If there are 10 minor divisions between two major divisions, one major division representing $1^{\circ} C$ , one minor division will be equal to

Discussion

2.	Noopur needs a lens of power -4.5D for correction of her vision what kind of defect in vision is she suffering from ?
Answer» Noopur needs a lens of power -4.5D for correction of her vision what kind of defect in vision is she suffering from ?

Discussion

3.	one coil of resistance 40 ohm is connected to a galvanometer of 160 ohm resistance. The coil has radius 6 mm and turns 100. This coil is placed between the poles of a magnet such that magnetic field is perpendicular to coil. If coil is dragged out then the charge through the galvanometer is 32 microcoulomb. The magnetic field is:- (1) 6.55 T (2) 5.66 T (3) 0.655 T (4) 0.566 T
Answer» one coil of resistance 40 ohm is connected to a galvanometer of 160 ohm resistance. The coil has radius 6 mm and turns 100. This coil is placed between the poles of a magnet such that magnetic field is perpendicular to coil. If coil is dragged out then the charge through the galvanometer is 32 microcoulomb. The magnetic field is:- (1) 6.55 T (2) 5.66 T (3) 0.655 T (4) 0.566 T

Discussion

4.	Question 13The resistivity does not change if(a) the material is changed(b) the temperature is changed(c) the shape of the resistor is changed(d) both material and temperature are changed
Answer» Question 13 The resistivity does not change if (a) the material is changed (b) the temperature is changed (c) the shape of the resistor is changed (d) both material and temperature are changed

Discussion

5.	What is the other name of old age hypermetropia ?
Answer» What is the other name of old age hypermetropia ?

Discussion

6.	Which of the following terms means to use old materials such as glass, paper to synthesize new items?
Answer» Which of the following terms means to use old materials such as glass, paper to synthesize new items?

Discussion

7.	The approximate value of solar constant is ___.
Answer» The approximate value of solar constant is ___.

Discussion

8.	How is dispersed white light recomposed?
Answer» How is dispersed white light recomposed?

Discussion

9.	In the experiment on finding the equivalent resistance of two resistors connected in series, three students connected the ammeter in their circuits in the three ways X, Y and Z shown here.Assuming their ammeters to be ideal, the ammeters have been correctly connected in(1) cases X and Y only(2) cases Y and Z only(3) cases Z and X only(4) all the three cases
Answer» In the experiment on finding the equivalent resistance of two resistors connected in series, three students connected the ammeter in their circuits in the three ways X, Y and Z shown here. Assuming their ammeters to be ideal, the ammeters have been correctly connected in (1) cases X and Y only (2) cases Y and Z only (3) cases Z and X only (4) all the three cases

Discussion

10.	A combination of 3 convex lenses is made. The focal length of lens I is +5 cm, lens II is +10 cm and lens III is +20 cm. Calculate the total power of the combination in dioptre?35
Answer» A combination of $3$ convex lenses is made. The focal length of lens I is $+ 5 c m$ , lens II is $+ 10 c m$ and lens III is $+ 20 c m$ . Calculate the total power of the combination in dioptre? 35

10.

A combination of 3 convex lenses is made. The focal length of lens I is +5 cm, lens II is +10 cm and lens III is +20 cm. Calculate the total power of the combination in dioptre?35

Answer»

A combination of $3$ convex lenses is made. The focal length of lens I is $+ 5 c m$ , lens II is $+ 10 c m$ and lens III is $+ 20 c m$ . Calculate the total power of the combination in dioptre?

35

Discussion

11.	A double convex lens has two surfaces of equal radii 15 cm and refractive index μ=1.5, its focal length is equal to
Answer» A double convex lens has two surfaces of equal radii $15 cm$ and refractive index $μ = 1.5$ , its focal length is equal to

Discussion

12.	A real image is formed by a lens. What can be said about the magnification produced by the lens?
Answer» A real image is formed by a lens. What can be said about the magnification produced by the lens?

Discussion

13.	If the temperature of a wire of length 2 m and area of cross-section 1 cm^2 is increased from 0^0c to80^0 c and is not allowed to increase in length then force requred for is (Y= 10^{10}N/m^2. α= 10^{-6}/^0 C) 1 80N 2) 160N 3) 400N 4) 120 N
Answer» If the temperature of a wire of length 2 m and area of cross-section 1 cm^2 is increased from 0^0c to80^0 c and is not allowed to increase in length then force requred for is (Y= 10^{10}N/m^2. α= 10^{-6}/^0 C) 1 80N 2) 160N 3) 400N 4) 120 N

Discussion

14.	How should the two resistances of 2 ohms each be connected so as to produce resistance of 1ohm
Answer» How should the two resistances of 2 ohms each be connected so as to produce resistance of 1ohm

Discussion

15.	range of y=1-x to the power3
Answer» range of y=1-x to the power3

Discussion

16.	Find the capacitance of parallel plate capacitor separately for the given cases (a) when the inner side of inner plate is earthed (b) when the inner side of outer plate is earthed
Answer» Find the capacitance of parallel plate capacitor separately for the given cases (a) when the inner side of inner plate is earthed (b) when the inner side of outer plate is earthed

Discussion

17.	A thin lens of refractive index 1.5, and focal length in air of 20 cm is placed inside a large container containing two immiscible liquids as shown below. If an object is placed at an infinite distance close to principle axis (common intersection of the two layers), then the distance between images is (in cm)
Answer» A thin lens of refractive index 1.5, and focal length in air of $20 c m$ is placed inside a large container containing two immiscible liquids as shown below. If an object is placed at an infinite distance close to principle axis (common intersection of the two layers), then the distance between images is (in $c m$ )

Discussion

18.	Escape velocity
Answer» Escape velocity

Discussion

19.	A pipe of length 85cm is closed from one end find the number of possible natural oscillation of air column in the pipe whose frequency is lie below 1250 hertz the velocity of sound in air is 340 metre per second
Answer» A pipe of length 85cm is closed from one end find the number of possible natural oscillation of air column in the pipe whose frequency is lie below 1250 hertz the velocity of sound in air is 340 metre per second

Discussion

20.	Are the electrons which are mentioned in electricity and the electrons mentioned in atom same??
Answer» Are the electrons which are mentioned in electricity and the electrons mentioned in atom same??

Discussion

21.	41.Two electric bulbs having resistance in the ratio 2:3 are connected in parallel to a voltage source of 220V. The ratio of the power dissipated in them is
Answer» 41.Two electric bulbs having resistance in the ratio 2:3 are connected in parallel to a voltage source of 220V. The ratio of the power dissipated in them is

Discussion

22.	Light of a single colour is passed through a liquid having a piece of glass suspended in it. On changing the temperature of liquid, at a particular temperature the glass piece is not seen. (i) When is the glass piece not seen? (ii) Why is the light of a single colour used?
Answer» Light of a single colour is passed through a liquid having a piece of glass suspended in it. On changing the temperature of liquid, at a particular temperature the glass piece is not seen. (i) When is the glass piece not seen? (ii) Why is the light of a single colour used?

22.

Light of a single colour is passed through a liquid having a piece of glass suspended in it. On changing the temperature of liquid, at a particular temperature the glass piece is not seen. (i) When is the glass piece not seen? (ii) Why is the light of a single colour used?

Answer»

Light of a single colour is passed through a liquid having a piece of glass suspended in it. On changing the temperature of liquid, at a particular temperature the glass piece is not seen.

(i) When is the glass piece not seen?

(ii) Why is the light of a single colour used?

Discussion

23.	calculatethe △ G^0 and equilibrium cons†an t of the reaction at 27^0C Mg+Cu^{+2}--->Mg^{+2 } + Cu {E^0}_{Mg^{2+}/Mg}=-2.37V,{E^0}_{Cu^{2+}/Cu}=+0.34
Answer» calculatethe △ G^0 and equilibrium cons†an t of the reaction at 27^0C Mg+Cu^{+2}--->Mg^{+2 } + Cu {E^0}_{Mg^{2+}/Mg}=-2.37V,{E^0}_{Cu^{2+}/Cu}=+0.34

Discussion

24.	A combination of two thin convex lenses of focal length 0.25 m and 0.12 m will have minimum spherical and chromatic aberrations if the distance between them is
Answer» A combination of two thin convex lenses of focal length $0.25 m$ and $0.12 m$ will have minimum spherical and chromatic aberrations if the distance between them is

Discussion

25.	In the circuit shown in figure calculate the resistance between the points B and D.
Answer» In the circuit shown in figure calculate the resistance between the points B and D.

25.

In the circuit shown in figure calculate the resistance between the points B and D.

Answer»

In the circuit shown in figure calculate the resistance between the points B and D.

Discussion

26.	What are the difficulties in using ground based optical telescopes and how can we overcome them?
Answer» What are the difficulties in using ground based optical telescopes and how can we overcome them?

Discussion

27.	When a concave mirror is placed facing the sun, the sun rays converge to a point 15 cm from the mirror. Now, an erect 2 cm long pin is placed 30 cm away on the principal axis of the mirror. Where a card should be placed so that the image of the pin can be taken on the card? What would be the nature and height of the image?
Answer» When a concave mirror is placed facing the sun, the sun rays converge to a point 15 cm from the mirror. Now, an erect 2 cm long pin is placed 30 cm away on the principal axis of the mirror. Where a card should be placed so that the image of the pin can be taken on the card? What would be the nature and height of the image?

Discussion

28.	(a) An object is placed between f and 2f in front of a convex lens. Draw a labelled ray-diagram to show the formation of image.(b) State whether the image formed is real or virtual.(c) State whether the image formed is diminished or enlarged.
Answer» (a) An object is placed between f and 2f in front of a convex lens. Draw a labelled ray-diagram to show the formation of image. (b) State whether the image formed is real or virtual. (c) State whether the image formed is diminished or enlarged.

Discussion

29.	(a) What is a solenoid? Draw a sketch of the pattern of field lines of the magnetic field through and around a current carrying solenoid.(b) Consider a circular loop of wire lying in the plane of the table. Let the current pass through the loop clockwise. Apply the right hand rule to find out the direction of the magnetic field inside and outside the loop.
Answer» (a) What is a solenoid? Draw a sketch of the pattern of field lines of the magnetic field through and around a current carrying solenoid. (b) Consider a circular loop of wire lying in the plane of the table. Let the current pass through the loop clockwise. Apply the right hand rule to find out the direction of the magnetic field inside and outside the loop.

Discussion

30.	43. An electric bulb of 100W-300V is connected with an AC supply of 500V and 150/pie Hz the required inductance to save the electric bulb is
Answer» 43. An electric bulb of 100W-300V is connected with an AC supply of 500V and 150/pie Hz the required inductance to save the electric bulb is

Discussion

31.	Which of the following terms means to re-use used materials again?
Answer» Which of the following terms means to re-use used materials again?

Discussion

32.	In which state electricity travels better?
Answer» In which state electricity travels better?

Discussion

33.	AB is the incident wavefront while CD is the reflected wavefront. The arrow in the figures show the direction of propagation of light. Which of the following options show the correct pair of incident and reflected wavefronts, along with the correct depiction of direction of propagation of light?
Answer» $A B$ is the incident wavefront while $C D$ is the reflected wavefront. The arrow in the figures show the direction of propagation of light. Which of the following options show the correct pair of incident and reflected wavefronts, along with the correct depiction of direction of propagation of light?

Discussion

34.	17.2 thin planoconcave lens of radii of curvature of curved surface 20cm and 24cm respectively.Curved surfaces are kept together and space between them is filled with liquid of refractive index 4/3.Refractive index of lens is 3/2.Find out focal length of the system.
Answer» 17.2 thin planoconcave lens of radii of curvature of curved surface 20cm and 24cm respectively.Curved surfaces are kept together and space between them is filled with liquid of refractive index 4/3.Refractive index of lens is 3/2.Find out focal length of the system.

Discussion

35.	A small luminous object is placed at a distance of 48xn from a convex lens of focal length 30cm on its principal axis. A concave lens of focal length 60cm is placed coaxially on the other side of the lens at a distance of X cm from it .If a real image is formed by the combination at a point 1.6 m from the convex lens then the value of X is
Answer» A small luminous object is placed at a distance of 48xn from a convex lens of focal length 30cm on its principal axis. A concave lens of focal length 60cm is placed coaxially on the other side of the lens at a distance of X cm from it .If a real image is formed by the combination at a point 1.6 m from the convex lens then the value of X is

Discussion

36.	A coil of insulated copper wire is connected to a galvanometer. If a bar magnet is held stationary inside the coil then there will be ___ deflection in the galvanometer.
Answer» A coil of insulated copper wire is connected to a galvanometer. If a bar magnet is held stationary inside the coil then there will be ___ deflection in the galvanometer.

Discussion

37.	What are dielectrics?
Answer» What are dielectrics?

Discussion

38.	Where should an object be placed in front of the concave mirror so as to obtain its virtual, erect and magnified image ?
Answer» Where should an object be placed in front of the concave mirror so as to obtain its virtual, erect and magnified image ?

Discussion

39.	What happens to the melting point of ice when we increase the pressure?
Answer» What happens to the melting point of ice when we increase the pressure?

Discussion

40.	A very long straight conductor has a circular cross-section of radius R . Inside the conductor there is a cylindrical hole of radius ‘a’ whose axis is parallel to the axis of the conductor and at a distance ‘b’ from it, as shown in the diagram .The conductor with hole carries current i. Let the z-axis be the axis of conductor and the axis of the hole at x = b, Match the following column. Column−IColumn−IIP) Magnitude of magnetic field at point P(2R,0)1) ZeroQ) X−component of magnetic field at point P(0,0)2) μ0i2πb(a2R2−a2)R) Magnitude of magnetic field at point P(0,0)3) μ0i2π(R2−a2)(a22R−b−R2)S) Magnitude of magnetic field at point P (b,0)4) μ0ib2π(R2−a2)
Answer» A very long straight conductor has a circular cross-section of radius R . Inside the conductor there is a cylindrical hole of radius ‘a’ whose axis is parallel to the axis of the conductor and at a distance ‘b’ from it, as shown in the diagram .The conductor with hole carries current i. Let the z-axis be the axis of conductor and the axis of the hole at x = b, Match the following column. $\begin{matrix} C o l u m n - I & C o l u m n - I I P) M a g n i t u d e o f m a g n e t i c f i e l d a t p o i n t P (2 R, 0) & 1) Z e r o Q) X - c o m p o n e n t o f m a g n e t i c f i e l d a t p o i n t P (0, 0) & 2) \frac{μ_{0} i}{2 π b} (\frac{a^{2}}{R^{2} - a^{2}}) R) M a g n i t u d e o f m a g n e t i c f i e l d a t p o i n t P (0, 0) & 3) \frac{μ_{0} i}{2 π (R^{2} - a^{2})} (\frac{a^{2}}{2 R - b} - \frac{R}{2}) S) M a g n i t u d e o f m a g n e t i c f i e l d a t p o i n t P (b, 0) & 4) \frac{μ_{0} i b}{2 π (R^{2} - a^{2})} \end{matrix}$

Discussion

41.	A plano convex lens of refractive index 1.5 and radius of curvature 30 cm is silvered at the curved surface. Now this lens has been used to form the image of an object. At what distance from this lens, an object needs to be placed in order to have a same size image of the object?
Answer» A plano convex lens of refractive index $1.5$ and radius of curvature $30 cm$ is silvered at the curved surface. Now this lens has been used to form the image of an object. At what distance from this lens, an object needs to be placed in order to have a same size image of the object?

Discussion

42.	the photoelectirc threshold wavelength of silver is 325010-10 m. the velocity of the electron ejected from silver surface by ultraviolet light of wavelength 2536 10-10 m. given h= 4.1410-15eVs and c= 310 ms-1.
Answer» the photoelectirc threshold wavelength of silver is 325010-10 m. the velocity of the electron ejected from silver surface by ultraviolet light of wavelength 2536 10-10 m. given h= 4.1410-15eVs and c= 310 ms-1.

Discussion

43.	A PN junction diode when forward biased has a drop of 0.5 V which is assumed to be independent of current. The current in excess of 10 mA through the diode produces large joule heating, which damages the diode. If we want to use a 1.5 V battery to forward bias the diode, the resistor used in series with the diode so that the maximum current does not exceed 5 mA is _____Ω.
Answer» A $PN$ junction diode when forward biased has a drop of $0.5 V$ which is assumed to be independent of current. The current in excess of $10 mA$ through the diode produces large joule heating, which damages the diode. If we want to use a $1.5 V$ battery to forward bias the diode, the resistor used in series with the diode so that the maximum current does not exceed $5 mA$ is _____ $Ω$ .

Discussion

44.	In a vessel of depth 21 cm, upto what height the water should be filled so that now it appears to be half filled if viewed from the top? (Take nw=43)
Answer» In a vessel of depth $21 cm$ , upto what height the water should be filled so that now it appears to be half filled if viewed from the top? $(Take n_{w} = \frac{4}{3})$

Discussion

45.	What is refraction? How will the sunrays refract after passing through a magnifying glass?
Answer» What is refraction? How will the sunrays refract after passing through a magnifying glass?

Discussion

46.	Derivantion of Ohm's law
Answer» Derivantion of Ohm's law

Discussion

47.	A hypothetical nuclear fission takes place as following: 23692X → 14056Y + 9436Y + neutrons How many neutrons will get emitted in the process?
Answer» A hypothetical nuclear fission takes place as following: $_{92}^{236} X \to_{56}^{140} Y +_{36}^{94} Y + neutrons$ How many neutrons will get emitted in the process?

Discussion

48.	Why does the sun appear red at sunrise and sunset?
Answer» Why does the sun appear red at sunrise and sunset?

Discussion

49.	In the domestic electric circuits, the red coloured insulated copper wire is called
Answer» In the domestic electric circuits, the red coloured insulated copper wire is called

Discussion

50.	Three lasers that are parallel to each other are directed towards a mirror. Which of the following depicts the reflection of light correctly?
Answer» Three lasers that are parallel to each other are directed towards a mirror. Which of the following depicts the reflection of light correctly?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

If there are 10 minor divisions between two major divisions, one major division representing 1∘C, one minor division will be equal to

Noopur needs a lens of power -4.5D for correction of her vision what kind of defect in vision is she suffering from ?

Question 13The resistivity does not change if(a) the material is changed(b) the temperature is changed(c) the shape of the resistor is changed(d) both material and temperature are changed

What is the other name of old age hypermetropia ?

Which of the following terms means to use old materials such as glass, paper to synthesize new items?

The approximate value of solar constant is ___.

How is dispersed white light recomposed?

A combination of 3 convex lenses is made. The focal length of lens I is +5 cm, lens II is +10 cm and lens III is +20 cm. Calculate the total power of the combination in dioptre?35

A double convex lens has two surfaces of equal radii 15 cm and refractive index μ=1.5, its focal length is equal to

A real image is formed by a lens. What can be said about the magnification produced by the lens?

If the temperature of a wire of length 2 m and area of cross-section 1 cm^2 is increased from 0^0c to80^0 c and is not allowed to increase in length then force requred for is (Y= 10^{10}N/m^2. α= 10^{-6}/^0 C) 1 80N 2) 160N 3) 400N 4) 120 N

How should the two resistances of 2 ohms each be connected so as to produce resistance of 1ohm

range of y=1-x to the power3

Find the capacitance of parallel plate capacitor separately for the given cases (a) when the inner side of inner plate is earthed (b) when the inner side of outer plate is earthed

Escape velocity

A pipe of length 85cm is closed from one end find the number of possible natural oscillation of air column in the pipe whose frequency is lie below 1250 hertz the velocity of sound in air is 340 metre per second

Are the electrons which are mentioned in electricity and the electrons mentioned in atom same??

41.Two electric bulbs having resistance in the ratio 2:3 are connected in parallel to a voltage source of 220V. The ratio of the power dissipated in them is

Light of a single colour is passed through a liquid having a piece of glass suspended in it. On changing the temperature of liquid, at a particular temperature the glass piece is not seen. (i) When is the glass piece not seen? (ii) Why is the light of a single colour used?

calculatethe △ G^0 and equilibrium cons†an t of the reaction at 27^0C Mg+Cu^{+2}--->Mg^{+2 } + Cu {E^0}_{Mg^{2+}/Mg}=-2.37V,{E^0}_{Cu^{2+}/Cu}=+0.34

A combination of two thin convex lenses of focal length 0.25 m and 0.12 m will have minimum spherical and chromatic aberrations if the distance between them is

In the circuit shown in figure calculate the resistance between the points B and D.

What are the difficulties in using ground based optical telescopes and how can we overcome them?

(a) An object is placed between f and 2f in front of a convex lens. Draw a labelled ray-diagram to show the formation of image.(b) State whether the image formed is real or virtual.​(c) State whether the image formed is diminished or enlarged.

43. An electric bulb of 100W-300V is connected with an AC supply of 500V and 150/pie Hz the required inductance to save the electric bulb is

Which of the following terms means to re-use used materials again?

In which state electricity travels better?

AB is the incident wavefront while CD is the reflected wavefront. The arrow in the figures show the direction of propagation of light. Which of the following options show the correct pair of incident and reflected wavefronts, along with the correct depiction of direction of propagation of light?

17.2 thin planoconcave lens of radii of curvature of curved surface 20cm and 24cm respectively.Curved surfaces are kept together and space between them is filled with liquid of refractive index 4/3.Refractive index of lens is 3/2.Find out focal length of the system.

A coil of insulated copper wire is connected to a galvanometer. If a bar magnet is held stationary inside the coil then there will be ___ deflection in the galvanometer.

What are dielectrics?

Where should an object be placed in front of the concave mirror so as to obtain its virtual, erect and magnified image ?

What happens to the melting point of ice when we increase the pressure?

A plano convex lens of refractive index 1.5 and radius of curvature 30 cm is silvered at the curved surface. Now this lens has been used to form the image of an object. At what distance from this lens, an object needs to be placed in order to have a same size image of the object?

the photoelectirc threshold wavelength of silver is 3250*10-10 m. the velocity of the electron ejected from silver surface by ultraviolet light of wavelength 2536* 10-10 m. given h= 4.14*10-15eVs and c= 3*10 ms-1.

In a vessel of depth 21 cm, upto what height the water should be filled so that now it appears to be half filled if viewed from the top? (Take nw=43)

What is refraction? How will the sunrays refract after passing through a magnifying glass?

Derivantion of Ohm's law

A hypothetical nuclear fission takes place as following: 23692X → 14056Y + 9436Y + neutrons How many neutrons will get emitted in the process?

Why does the sun appear red at sunrise and sunset?

In the domestic electric circuits, the red coloured insulated copper wire is called

Three lasers that are parallel to each other are directed towards a mirror. Which of the following depicts the reflection of light correctly?

(a) An object is placed between f and 2f in front of a convex lens. Draw a labelled ray-diagram to show the formation of image.(b) State whether the image formed is real or virtual.(c) State whether the image formed is diminished or enlarged.

the photoelectirc threshold wavelength of silver is 325010-10 m. the velocity of the electron ejected from silver surface by ultraviolet light of wavelength 2536 10-10 m. given h= 4.1410-15eVs and c= 310 ms-1.