16569 + Interview Questions in Physics

1.	If the image was formed in front of the retina rather than behind the retina, then the person would need to correct the vision problem by using a:
Answer» If the image was formed in front of the retina rather than behind the retina, then the person would need to correct the vision problem by using a:

Discussion

2.

From the following three lenses, two lenses are used as an eyepiece and the objective lens, to construct an astronomical telescope. Find the angular magnification for the normal adjustment. Lenses Power Aperture L1 3 D 8 cm L2 6 D 1 cm L3 10 D 1 cm

Answer»

From the following three lenses, two lenses are used as an eyepiece and the objective lens, to construct an astronomical telescope. Find the angular magnification for the normal adjustment.

Lenses	Power	Aperture
$L_{1}$	$3 D$	$8 cm$
$L_{2}$	$6 D$	$1 cm$
$L_{3}$	$10 D$	$1 cm$

Discussion

3.	An object of mass 20 kg is raised to a height 5 m above the ground. What is its P.E.? If object is allowed to fall, find its K.E. just before touching the ground and also its K.E. when it is half way down. [3 MARKS]
Answer» An object of mass 20 kg is raised to a height 5 m above the ground. What is its P.E.? If object is allowed to fall, find its K.E. just before touching the ground and also its K.E. when it is half way down. [3 MARKS]

Discussion

4.	What is charge on alpha particle
Answer» What is charge on alpha particle

Discussion

5.	Why does the sky appear dark (or black) to an astronaut instead of blue ?
Answer» Why does the sky appear dark (or black) to an astronaut instead of blue ?

Discussion

6.	What is the relation between the focal length and radius of curvature of a spherical mirror (concave mirror or convex mirror) ? Calculate the focal length of a spherical mirror whose radius of curvature is 25 cm.
Answer» What is the relation between the focal length and radius of curvature of a spherical mirror (concave mirror or convex mirror) ? Calculate the focal length of a spherical mirror whose radius of curvature is 25 cm.

Discussion

7.	A fin has 5 mm diameter and 100 mm length. The thermal conductivity of fin material is 400 Wm−1K−1. One end of the fin is maintained at 130∘C and its remaining surface is exposed to ambient air at 30∘C. If the convective heat transfer coefficient is 40 Wm−2K−1, the heat loss (in W) from the fin is
Answer» A fin has $5 m m$ diameter and $100 m m$ length. The thermal conductivity of fin material is $400 W m^{- 1} K^{- 1} .$ One end of the fin is maintained at $130^{\circ} C$ and its remaining surface is exposed to ambient air at $30^{\circ} C$ . If the convective heat transfer coefficient is $40 W m^{- 2} K^{- 1},$ the heat loss (in W) from the fin is

Discussion

8.	Which of the following physical quantities has different dimensions?
Answer» Which of the following physical quantities has different dimensions?

Discussion

9.	Patol Babu is an amateur actor for whom walk-on part in a movie turns into an ultimate challenge. Discuss.
Answer» Patol Babu is an amateur actor for whom walk-on part in a movie turns into an ultimate challenge. Discuss.

Discussion

10.	While tracing the path of a ray of light passing through a rectangular glass slab a student tabulated his observations as given below: S.NO.∠i∠r∠eI60∘39∘61∘II50∘36∘51∘III40∘28∘39∘IV30∘20∘31∘ The correct observation is:
Answer» While tracing the path of a ray of light passing through a rectangular glass slab a student tabulated his observations as given below: $\begin{matrix} S . N O . & ∠ i & ∠ r & ∠ e I & 60^{\circ} & 39^{\circ} & 61^{\circ} I I & 50^{\circ} & 36^{\circ} & 51^{\circ} I I I & 40^{\circ} & 28^{\circ} & 39^{\circ} I V & 30^{\circ} & 20^{\circ} & 31^{\circ} \end{matrix}$ The correct observation is:

10.

While tracing the path of a ray of light passing through a rectangular glass slab a student tabulated his observations as given below: S.NO.∠i∠r∠eI60∘39∘61∘II50∘36∘51∘III40∘28∘39∘IV30∘20∘31∘ The correct observation is:

Answer»

While tracing the path of a ray of light passing through a rectangular glass slab a student tabulated his observations as given below:
$\begin{matrix} S . N O . & ∠ i & ∠ r & ∠ e I & 60^{\circ} & 39^{\circ} & 61^{\circ} I I & 50^{\circ} & 36^{\circ} & 51^{\circ} I I I & 40^{\circ} & 28^{\circ} & 39^{\circ} I V & 30^{\circ} & 20^{\circ} & 31^{\circ} \end{matrix}$

The correct observation is:

Discussion

11.	Define current. Define one ampere of current. [2 MARKS]
Answer» Define current. Define one ampere of current. [2 MARKS]

Discussion

12.	A ray of light is incident on a medium at an angle 60°. The angle of refraction is different for different mediums for an angle of incidence = 60∘. In which medium the speed of light is slowest?
Answer» A ray of light is incident on a medium at an angle 60°. The angle of refraction is different for different mediums for an angle of incidence = $60^{\circ}$ . In which medium the speed of light is slowest?

12.

A ray of light is incident on a medium at an angle 60°. The angle of refraction is different for different mediums for an angle of incidence = 60∘. In which medium the speed of light is slowest?

Answer»

A ray of light is incident on a medium at an angle 60°. The angle of refraction is different for different mediums for an angle of incidence = $60^{\circ}$ .

In which medium the speed of light is slowest?

Discussion

13.	A body is projected from the surface of the earth with the speed 4\sqrt{gR}, then its interstellar speed is (Where R is the radius of the earth)
Answer» A body is projected from the surface of the earth with the speed 4\sqrt{gR}, then its interstellar speed is (Where R is the radius of the earth)

Discussion

14.	Two identical glass(u=3/2) equiconvex lenses of focal length f are kept in contact.The space between the two lenses is filled with water (u of water/4/3).the focal length of the combination is?
Answer» Two identical glass(u=3/2) equiconvex lenses of focal length f are kept in contact.The space between the two lenses is filled with water (u of water/4/3).the focal length of the combination is?

Discussion

15.	Two satellites of mass m and 2m are revolving in two circular orbits of radii r and 2r around an imaginary planet on the surface of which gravitational force is inversely proportional to the distance from its centre. The ratio of orbital speed of satellites is
Answer» Two satellites of mass m and 2m are revolving in two circular orbits of radii r and 2r around an imaginary planet on the surface of which gravitational force is inversely proportional to the distance from its centre. The ratio of orbital speed of satellites is

Discussion

16.	A uniform chain of length L and mass M is lying on smooth table and one third of its length is hanging vertically down over the edge of the table if g is acceleration due to gravity the minimum work required to pull the hanging part of the chain on the table is
Answer» A uniform chain of length L and mass M is lying on smooth table and one third of its length is hanging vertically down over the edge of the table if g is acceleration due to gravity the minimum work required to pull the hanging part of the chain on the table is

Discussion

17.	what is 1. the universal law of gravitation 2.newton's universal of gravitation 3. acceleration due to gravity 4.G & g relation ship and distinction 5.mass and density of earth 6. gravitational field 7. gravitational potential energy 8. gravitational potential 9.escape velocity 10. reason of atmosphere in moon 11. reason of atmosphere in earth 12. geo-stationary satellite 13. polar satellite 14. weightlessness in satellites 15 gravation
Answer» what is 1. the universal law of gravitation 2.newton's universal of gravitation 3. acceleration due to gravity 4.G & g relation ship and distinction 5.mass and density of earth 6. gravitational field 7. gravitational potential energy 8. gravitational potential 9.escape velocity 10. reason of atmosphere in moon 11. reason of atmosphere in earth 12. geo-stationary satellite 13. polar satellite 14. weightlessness in satellites 15 gravation

Discussion

18.	Masses of three wires of copper are in the ratio 1 : 3 : 5 and their lengths are in the ratio of 5 : 3 : 1. The ratio of their electrical resistances are ___ .
Answer» Masses of three wires of copper are in the ratio 1 : 3 : 5 and their lengths are in the ratio of 5 : 3 : 1. The ratio of their electrical resistances are ___ .

Discussion

19.	ntA car is moving on a frictionless surface. If engine delivers constant power, then how does displacement x of car varies with time t?n
Answer» ntA car is moving on a frictionless surface. If engine delivers constant power, then how does displacement x of car varies with time t?n

Discussion

20.	During flow of current....do only electrons move through our the circuit or any other sub atomic particles move like protons ???
Answer» During flow of current....do only electrons move through our the circuit or any other sub atomic particles move like protons ???

Discussion

21.	Two factories are sounding sirens at 800 Hz. A man goes from one factory to the other at a speed of 2 m/s. The velocity of sound is 320 m/s. The number of beats heard by the person in 1 s will be
Answer» Two factories are sounding sirens at $800 Hz$ . A man goes from one factory to the other at a speed of $2 m/s$ . The velocity of sound is $320 m/s$ . The number of beats heard by the person in $1 s$ will be

Discussion

22.	A battery of 3.0 V is connected to a resistor dissipating 0.5 W of power. If the terminal voltage of the battery is 2.5 V. The power dissipated within the internal resistance is-
Answer» A battery of $3.0 V$ is connected to a resistor dissipating $0.5 W$ of power. If the terminal voltage of the battery is $2.5 V .$ The power dissipated within the internal resistance is-

Discussion

23.	40g water at 50^0c is mixed with 20g ice at -20^0C. The final temperatire of the mixture is
Answer» 40g water at 50^0c is mixed with 20g ice at -20^0C. The final temperatire of the mixture is

Discussion

24.	A convex lens of focal length 5 cm is used in the combination with a concave lens of unknown focal length to form an achromatic combination. If the dispersive powers of the lenses are in the ratio 2:3 respectively. Then the value of focal length of concave lens will be :
Answer» A convex lens of focal length $5 cm$ is used in the combination with a concave lens of unknown focal length to form an achromatic combination. If the dispersive powers of the lenses are in the ratio $2 : 3$ respectively. Then the value of focal length of concave lens will be :

Discussion

25.	A RAY OF LIGHT IS INCIDENT ON A GLASS SLAB ( N=1.5) OF THICKNESS T IN SUCH A WAY THAT ANGLE OF REFRACTION IS 30 DEG SINE OF ANGLE OF INCIDENCE IS ??
Answer» A RAY OF LIGHT IS INCIDENT ON A GLASS SLAB ( N=1.5) OF THICKNESS T IN SUCH A WAY THAT ANGLE OF REFRACTION IS 30 DEG SINE OF ANGLE OF INCIDENCE IS ??

Discussion

26.	Which of the following instrument has the highest pitch?
Answer» Which of the following instrument has the highest pitch?

Discussion

27.	The bulb in the circuit shown below does not glow.Which of the following labelled part is responsible for this?
Answer» The bulb in the circuit shown below does not glow. Which of the following labelled part is responsible for this?

Discussion

28.	An electric generator works on the principle of ___.
Answer» An electric generator works on the principle of ___.

Discussion

29.	The critical angle for glass-air interface is : (a) 24∘ (b) 48∘ (c) 42∘ (d) 45∘
Answer» The critical angle for glass-air interface is : (a) $24^{\circ}$ (b) $48^{\circ}$ (c) $42^{\circ}$ (d) $45^{\circ}$

29.

The critical angle for glass-air interface is : (a) 24∘ (b) 48∘ (c) 42∘ (d) 45∘

Answer»

The critical angle for glass-air interface is :

(a) $24^{\circ}$ (b) $48^{\circ}$ (c) $42^{\circ}$ (d) $45^{\circ}$

Discussion

30.	What are the characteristics of a body in uniform motion along a straight line?
Answer» What are the characteristics of a body in uniform motion along a straight line?

Discussion

31.	A pulley system has a velocity ratio of 4 and an efficiency of 90 %. The effort required to raise a load of 300 N by the system is
Answer» A pulley system has a velocity ratio of 4 and an efficiency of 90 %. The effort required to raise a load of 300 N by the system is

Discussion

32.	3.How many miles are in 32 g of o2
Answer» 3.How many miles are in 32 g of o2

Discussion

33.	if the current in a circular coil is increased by 10 times then by what factor will the magnetic field at the centre of the loop change
Answer» if the current in a circular coil is increased by 10 times then by what factor will the magnetic field at the centre of the loop change

Discussion

34.	86. A closely wound solenoid 80 cm long has 5 layers of winding of 400 turns each. The diameter of the solenoid is 1.8 cm. If the current carried is 8.0 A , estimate the magnitude of magnetic field B inside the solenoid near its centre.
Answer» 86. A closely wound solenoid 80 cm long has 5 layers of winding of 400 turns each. The diameter of the solenoid is 1.8 cm. If the current carried is 8.0 A , estimate the magnitude of magnetic field B inside the solenoid near its centre.

Discussion

35.	Name the sources of heat.
Answer» Name the sources of heat.

Discussion

36.	three particles of masses m , m , and 4 kg are kept on the verticals of triangle ABC . coordinate of A , B, C are (1,2) , (3,2) , (-2,-2) respectively such that the centre of mass lies at origin . find value of mass m
Answer» three particles of masses m , m , and 4 kg are kept on the verticals of triangle ABC . coordinate of A , B, C are (1,2) , (3,2) , (-2,-2) respectively such that the centre of mass lies at origin . find value of mass m

Discussion

37.	32.A force of 5N produces an acceleration of 8ms^-2 on a mass M1 and an acceleration of 24ms^-2 on a mass M2 what is acceleration in ms^-2would the same force provide of both the masses are tied ?
Answer» 32.A force of 5N produces an acceleration of 8ms^-2 on a mass M1 and an acceleration of 24ms^-2 on a mass M2 what is acceleration in ms^-2would the same force provide of both the masses are tied ?

Discussion

38.	Two points A and B are at distances a and b respectively from an infinite conducting plate having a charge sigma. The walk by the electric force in moving the charge Q from A to B is
Answer» Two points A and B are at distances a and b respectively from an infinite conducting plate having a charge sigma. The walk by the electric force in moving the charge Q from A to B is

Discussion

39.	There are two charges }+2μ C and }-3μ C . The ratio of forces acting on them will be } WITH RESPECT TO WHICH CHARGE IT MUST BE CALCULATED??
Answer» There are two charges }+2μ C and }-3μ C . The ratio of forces acting on them will be } WITH RESPECT TO WHICH CHARGE IT MUST BE CALCULATED??

Discussion

40.	graph of movementum verses kinetic energy i
Answer» graph of movementum verses kinetic energy i

Discussion

41.	Which moves faster ,electron or ball? Why? is mass inversely proportional to velocity?
Answer» Which moves faster ,electron or ball? Why? is mass inversely proportional to velocity?

Discussion

42.	Compute the heat generated while transferring 96000 C of charge through a potential difference of 30V.
Answer» Compute the heat generated while transferring 96000 C of charge through a potential difference of 30V.

Discussion

43.	How coagulation power and gold number are related?
Answer» How coagulation power and gold number are related?

Discussion

44.	ntProve thatn ntS = -n F dE/dT,n ntWhere S= enthalpy changen ntF = faraday constantn ntT = temperaturen
Answer» ntProve thatn ntS = -n F dE/dT,n ntWhere S= enthalpy changen ntF = faraday constantn ntT = temperaturen

Discussion

45.	The strength of magnetic field inside a long current carrying straight solenoid is
Answer» The strength of magnetic field inside a long current carrying straight solenoid is

Discussion

46.	Question 22Explain the process which enables us to perceive motion in a cartoon film.
Answer» Question 22 Explain the process which enables us to perceive motion in a cartoon film.

46.

Question 22Explain the process which enables us to perceive motion in a cartoon film.

Answer»

Question 22

Explain the process which enables us to perceive motion in a cartoon film.

Discussion

47.	do charge moving with variable velocity produces both electric and magnetic field? like cinstant charge
Answer» do charge moving with variable velocity produces both electric and magnetic field? like cinstant charge

Discussion

48.	In normal use, a current of 3.5 A flows through a hair dryer. Choose a suitable fuse from the following : (a) 3 A (b) 5 A (c) 10 A (d) 30 A
Answer» In normal use, a current of 3.5 A flows through a hair dryer. Choose a suitable fuse from the following : (a) 3 A (b) 5 A (c) 10 A (d) 30 A

48.

In normal use, a current of 3.5 A flows through a hair dryer. Choose a suitable fuse from the following : (a) 3 A (b) 5 A (c) 10 A (d) 30 A

Answer»

In normal use, a current of 3.5 A flows through a hair dryer. Choose a suitable fuse from the following :

(a) 3 A (b) 5 A (c) 10 A (d) 30 A

Discussion

49.	23. Vanadium electrode is oxidised electrically. If the mass of electrode decreases by 100 mg during the passage of 570 coulomb, the oxidation state of vanadium in the product is. (At. Why. Of V=51)
Answer» 23. Vanadium electrode is oxidised electrically. If the mass of electrode decreases by 100 mg during the passage of 570 coulomb, the oxidation state of vanadium in the product is. (At. Why. Of V=51)

Discussion

50.	Under which of the following type of resources tidal energy cannot be put ?(a) Replenishable(b) Abiotic(c) Human-made(d) Non-recyclable
Answer» Under which of the following type of resources tidal energy cannot be put ? (a) Replenishable (b) Abiotic (c) Human-made (d) Non-recyclable

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

If the image was formed in front of the retina rather than behind the retina, then the person would need to correct the vision problem by using a:

From the following three lenses, two lenses are used as an eyepiece and the objective lens, to construct an astronomical telescope. Find the angular magnification for the normal adjustment. Lenses Power Aperture L1 3 D 8 cm L2 6 D 1 cm L3 10 D 1 cm

An object of mass 20 kg is raised to a height 5 m above the ground. What is its P.E.? If object is allowed to fall, find its K.E. just before touching the ground and also its K.E. when it is half way down. [3 MARKS]

What is charge on alpha particle

Why does the sky appear dark (or black) to an astronaut instead of blue ?

What is the relation between the focal length and radius of curvature of a spherical mirror (concave mirror or convex mirror) ? Calculate the focal length of a spherical mirror whose radius of curvature is 25 cm.

Which of the following physical quantities has different dimensions?

Patol Babu is an amateur actor for whom walk-on part in a movie turns into an ultimate challenge. Discuss.

While tracing the path of a ray of light passing through a rectangular glass slab a student tabulated his observations as given below: S.NO.∠i∠r∠eI60∘39∘61∘II50∘36∘51∘III40∘28∘39∘IV30∘20∘31∘ The correct observation is:

Define current. Define one ampere of current. [2 MARKS]

A ray of light is incident on a medium at an angle 60°. The angle of refraction is different for different mediums for an angle of incidence = 60∘. In which medium the speed of light is slowest?

A body is projected from the surface of the earth with the speed 4\sqrt{gR}, then its interstellar speed is (Where R is the radius of the earth)

Two identical glass(u=3/2) equiconvex lenses of focal length f are kept in contact.The space between the two lenses is filled with water (u of water/4/3).the focal length of the combination is?

Two satellites of mass m and 2m are revolving in two circular orbits of radii r and 2r around an imaginary planet on the surface of which gravitational force is inversely proportional to the distance from its centre. The ratio of orbital speed of satellites is

A uniform chain of length L and mass M is lying on smooth table and one third of its length is hanging vertically down over the edge of the table if g is acceleration due to gravity the minimum work required to pull the hanging part of the chain on the table is

Masses of three wires of copper are in the ratio 1 : 3 : 5 and their lengths are in the ratio of 5 : 3 : 1. The ratio of their electrical resistances are ___ .

ntA car is moving on a frictionless surface. If engine delivers constant power, then how does displacement x of car varies with time t?n

During flow of current....do only electrons move through our the circuit or any other sub atomic particles move like protons ???

Two factories are sounding sirens at 800 Hz. A man goes from one factory to the other at a speed of 2 m/s. The velocity of sound is 320 m/s. The number of beats heard by the person in 1 s will be

A battery of 3.0 V is connected to a resistor dissipating 0.5 W of power. If the terminal voltage of the battery is 2.5 V. The power dissipated within the internal resistance is-

40g water at 50^0c is mixed with 20g ice at -20^0C. The final temperatire of the mixture is

A convex lens of focal length 5 cm is used in the combination with a concave lens of unknown focal length to form an achromatic combination. If the dispersive powers of the lenses are in the ratio 2:3 respectively. Then the value of focal length of concave lens will be :

A RAY OF LIGHT IS INCIDENT ON A GLASS SLAB ( N=1.5) OF THICKNESS T IN SUCH A WAY THAT ANGLE OF REFRACTION IS 30 DEG SINE OF ANGLE OF INCIDENCE IS ??

Which of the following instrument has the highest pitch?

The bulb in the circuit shown below does not glow.Which of the following labelled part is responsible for this?

An electric generator works on the principle of ___.

The critical angle for glass-air interface is : (a) 24∘ (b) 48∘ (c) 42∘ (d) 45∘

What are the characteristics of a body in uniform motion along a straight line?

A pulley system has a velocity ratio of 4 and an efficiency of 90 %. The effort required to raise a load of 300 N by the system is

3.How many miles are in 32 g of o2

if the current in a circular coil is increased by 10 times then by what factor will the magnetic field at the centre of the loop change

86. A closely wound solenoid 80 cm long has 5 layers of winding of 400 turns each. The diameter of the solenoid is 1.8 cm. If the current carried is 8.0 A , estimate the magnitude of magnetic field B inside the solenoid near its centre.

Name the sources of heat.

three particles of masses m , m , and 4 kg are kept on the verticals of triangle ABC . coordinate of A , B, C are (1,2) , (3,2) , (-2,-2) respectively such that the centre of mass lies at origin . find value of mass m

32.A force of 5N produces an acceleration of 8ms^-2 on a mass M1 and an acceleration of 24ms^-2 on a mass M2 what is acceleration in ms^-2would the same force provide of both the masses are tied ?

Two points A and B are at distances a and b respectively from an infinite conducting plate having a charge sigma. The walk by the electric force in moving the charge Q from A to B is

There are two charges }+2μ C and }-3μ C . The ratio of forces acting on them will be } WITH RESPECT TO WHICH CHARGE IT MUST BE CALCULATED??

graph of movementum verses kinetic energy i

Which moves faster ,electron or ball? Why? is mass inversely proportional to velocity?

Compute the heat generated while transferring 96000 C of charge through a potential difference of 30V.

How coagulation power and gold number are related?

ntProve thatn ntS = -n F dE/dT,n ntWhere S= enthalpy changen ntF = faraday constantn ntT = temperaturen

The strength of magnetic field inside a long current carrying straight solenoid is

Question 22Explain the process which enables us to perceive motion in a cartoon film.

do charge moving with variable velocity produces both electric and magnetic field? like cinstant charge

In normal use, a current of 3.5 A flows through a hair dryer. Choose a suitable fuse from the following : (a) 3 A (b) 5 A (c) 10 A (d) 30 A

23. Vanadium electrode is oxidised electrically. If the mass of electrode decreases by 100 mg during the passage of 570 coulomb, the oxidation state of vanadium in the product is. (At. Why. Of V=51)

Under which of the following type of resources tidal energy cannot be put ?(a) Replenishable(b) Abiotic(c) Human-made(d) Non-recyclable