16569 + Interview Questions in Physics

1.	The length of a wire of a potentiometer is 100 cm and the end of its standard cell is E volt . It is employed to measure the emf of a battery whose internal resistance is 0.5 ohm. If the balance point is obtained at L=30cm from the positive end , the emf of battery is 1. 30E/100.5 2. 30E/100-0.5 30(E-0.5i)/100, where I is the current in the potentiometer wire 4. 30E/100
Answer» The length of a wire of a potentiometer is 100 cm and the end of its standard cell is E volt . It is employed to measure the emf of a battery whose internal resistance is 0.5 ohm. If the balance point is obtained at L=30cm from the positive end , the emf of battery is 1. 30E/100.5 2. 30E/100-0.5 30(E-0.5i)/100, where I is the current in the potentiometer wire 4. 30E/100

Discussion

2.	A point object is placed at distance of 26 m from convex lens of focal length 20cm if a glass slab of thickness t and refractive index 1.5 is inserted between the lens and the object the image is formed at Infinity the thickness t is
Answer» A point object is placed at distance of 26 m from convex lens of focal length 20cm if a glass slab of thickness t and refractive index 1.5 is inserted between the lens and the object the image is formed at Infinity the thickness t is

Discussion

3.	274. A beam of light in air is incident upon the smoothplane surface of a piece of flint glass making anangle of 30 with its plane If the reflected beamand refracted beam are perpendicular to each other,what is the index of refraction of flint glass withrespect to air?
Answer» 274. A beam of light in air is incident upon the smoothplane surface of a piece of flint glass making anangle of 30 with its plane If the reflected beamand refracted beam are perpendicular to each other,what is the index of refraction of flint glass withrespect to air?

Discussion

4.	the dimensions of time in energy ar
Answer» the dimensions of time in energy ar

Discussion

5.	In an astronomical telescope in normal adjustment, a straight black line of length L is drawn on the inside part of the objective lens. The eyepiece forms a real image of this line. The length of this image is I. The magnification of the telescope is -
Answer» In an astronomical telescope in normal adjustment, a straight black line of length $L$ is drawn on the inside part of the objective lens. The eyepiece forms a real image of this line. The length of this image is $I$ . The magnification of the telescope is -

Discussion

6.	6.The radius of each of two circular coils of single turn is r. The two coils are placed parallel to each other with a common axis. The distance between the centres of the coils is r/2. If equal current is sent through the two coils in the same direction, what will be the magnetic field at the centre of each coil. What will be the magnetic field at the midpoint on the line joining the two centres.
Answer» 6.The radius of each of two circular coils of single turn is r. The two coils are placed parallel to each other with a common axis. The distance between the centres of the coils is r/2. If equal current is sent through the two coils in the same direction, what will be the magnetic field at the centre of each coil. What will be the magnetic field at the midpoint on the line joining the two centres.

Discussion

7.	i) Name the rule that is used to find the direction of magnetic field associated with the current carrying conductor ii) is there a similar magnetic field produced around the thin beam of moving a)Alpha particles? justify your answer
Answer» i) Name the rule that is used to find the direction of magnetic field associated with the current carrying conductor ii) is there a similar magnetic field produced around the thin beam of moving a)Alpha particles? justify your answer

Discussion

8.	A net force of 20N acts on a 5 kg mass kept at rest. Distance travelled by the mass in 6 s is
Answer» A net force of 20N acts on a 5 kg mass kept at rest. Distance travelled by the mass in 6 s is

Discussion

9.	What is the work done in carrying a charge Q once around a circle of radius r about a charge Q at the center.
Answer» What is the work done in carrying a charge Q once around a circle of radius r about a charge Q at the center.

Discussion

10.	A beam of light passes from medium 1 to medium 2 to medium 3 as shown in figure. What may be concluded about the three indices of refraction, n1, n2 and n3 ?
Answer» A beam of light passes from medium 1 to medium 2 to medium 3 as shown in figure. What may be concluded about the three indices of refraction, $n_{1}, n_{2}$ and $n_{3}$ ?

Discussion

11.	Question 8 (a) Name the type of mirror used in the given situation. Headlights of a car Support your answer with reason.
Answer» Question 8 (a) Name the type of mirror used in the given situation. Headlights of a car Support your answer with reason.

Discussion

12.	A metal parallelopiped of measures 16 cm ×11 cm ×10 cm was melted to make coins. How many coins were made if the thickness and diameter of each coin was 2 mm and 2 cm respectively ?
Answer» A metal parallelopiped of measures 16 cm $\times$ 11 cm $\times$ 10 cm was melted to make coins. How many coins were made if the thickness and diameter of each coin was 2 mm and 2 cm respectively ?

Discussion

13.	An object of mass 5 kg it blast in 2 segment their masses 2 kg & 3 kg . Total mechanical energy of these 2 object are 600 J determine speeds of these 2 object?
Answer» An object of mass 5 kg it blast in 2 segment their masses 2 kg & 3 kg . Total mechanical energy of these 2 object are 600 J determine speeds of these 2 object?

Discussion

14.	If resistance is halved, the current is doubled. Show.
Answer» If resistance is halved, the current is doubled. Show.

Discussion

15.	25.An electric current of 100 A is passed through a molten liquid NaCl for 4 hours. Calculate the volume of chloride gas liberated at electrodes at NTP.
Answer» 25.An electric current of 100 A is passed through a molten liquid NaCl for 4 hours. Calculate the volume of chloride gas liberated at electrodes at NTP.

Discussion

16.	A glass prism of refractive index 1.5 is immersed in water (μ=43). A light beam incident normally on the face AB is totally reflected to reach the face BC if
Answer» A glass prism of refractive index 1.5 is immersed in water $(μ = \frac{4}{3})$ . A light beam incident normally on the face AB is totally reflected to reach the face BC if

Discussion

17.	Why does sky appears blue ?
Answer» Why does sky appears blue ?

Discussion

18.	When an arrow is shot from a bow, it has kinetic energy in it.Explain briefly from where does it get its kinetic energy.
Answer» When an arrow is shot from a bow, it has kinetic energy in it.Explain briefly from where does it get its kinetic energy.

Discussion

19.	There are three sources of frequency 200hz,201hz,202hz.if all sounded simultaneously then no.of beats per sec
Answer» There are three sources of frequency 200hz,201hz,202hz.if all sounded simultaneously then no.of beats per sec

Discussion

20.	A bulb of resistance 1 ohm is connected across a battery of 10 V. Find the power consumed.
Answer» A bulb of resistance 1 ohm is connected across a battery of 10 V. Find the power consumed.

Discussion

21.	Define the term Lever
Answer» Define the term Lever

Discussion

22.	In a step up transformer, the ratio of turns of primary to secondary is 5:6 and the primary voltage is 410 V. If the current in the primary is 4 A, then what is the load current?
Answer» In a step up transformer, the ratio of turns of primary to secondary is $5 : 6$ and the primary voltage is $410 V$ . If the current in the primary is $4 A$ , then what is the load current?

Discussion

23.	Light travels from medium X to a medium Y where the bends towards the normal. What happens from the followin a) both the speed and frequency decrease b) speed increases and frequency decreases c) the speed decreases and wavelength decrease d) the speed decreases and wavelength increases
Answer» Light travels from medium X to a medium Y where the bends towards the normal. What happens from the followin a) both the speed and frequency decrease b) speed increases and frequency decreases c) the speed decreases and wavelength decrease d) the speed decreases and wavelength increases

Discussion

24.	A square loop is placed near a long straight current carrying wire as shown. Match the following two columns.Column-IColumn-II(a) If current increased(p) induced current in loop is clockwise(b) If current is decreased(q) induced current in loop is anticlockwise(c) If loop is moved away from the wire(r) wire will attract the loop(d) If loop is moved towards the wire(s) wire will repel the loop
Answer» A square loop is placed near a long straight current carrying wire as shown. Match the following two columns. $\begin{matrix} Column-I & Column-II (a) If current increased & (p) induced current in loop is clockwise (b) If current is decreased & (q) induced current in loop is anticlockwise (c) If loop is moved away from the wire & (r) wire will attract the loop (d) If loop is moved towards the wire & (s) wire will repel the loop \end{matrix}$

Discussion

25.	Which statement is not true about the gravitational forces?
Answer» Which statement is not true about the gravitational forces?

Discussion

26.	Which of the following is used as a safety device?
Answer» Which of the following is used as a safety device?

Discussion

27.	A wire of resistance R is stretched to twice of its original lenght. Find its new resistance
Answer» A wire of resistance R is stretched to twice of its original lenght. Find its new resistance

Discussion

28.	The expected graphical representation of the variation of angle of deviation ′δ′ with angle of incidence ′i′ in a prism is :
Answer» The expected graphical representation of the variation of angle of deviation $^{'} δ^{'}$ with angle of incidence $^{'} i^{'}$ in a prism is :

Discussion

29.	If the direction of current in the conductor and the magnetic field are the same, in which way will the conductor move?
Answer» If the direction of current in the conductor and the magnetic field are the same, in which way will the conductor move?

Discussion

30.	(a) What is the source of energy of ths sun and other stars ? (b) Describe the working of a hydrogen bomb. (c) What is common between the sun and a hydrogen bomb ?
Answer» (a) What is the source of energy of ths sun and other stars ? (b) Describe the working of a hydrogen bomb. (c) What is common between the sun and a hydrogen bomb ?

Discussion

31.	Two charges Q1 and Q2 are separated by a distance D . if both Q1 and D are doubled, the force is-
Answer» Two charges $Q_{1}$ and $Q_{2}$ are separated by a distance D . if both $Q_{1}$ and D are doubled, the force is-

Discussion

32.	A 5.0 cm tall light bulb has placed a distance of 50 cm from a convex mirror having a focal length of 10 cm. What is the image height?
Answer» A 5.0 cm tall light bulb has placed a distance of 50 cm from a convex mirror having a focal length of 10 cm. What is the image height?

32.

A 5.0 cm tall light bulb has placed a distance of 50 cm from a convex mirror having a focal length of 10 cm. What is the image height?

Answer»

A 5.0 cm tall light bulb has placed a distance of 50 cm from a convex mirror having a focal length of 10 cm. What is the image height?

Discussion

33.	Voilet colour has more wave length compared to blue as well as red.Then why doesn't the sky appear voilet in colour ?
Answer» Voilet colour has more wave length compared to blue as well as red.Then why doesn't the sky appear voilet in colour ?

Discussion

34.	wheather we want to take the exact distance mention in the question in scale like an object is placed away from the mirror
Answer» wheather we want to take the exact distance mention in the question in scale like an object is placed away from the mirror

Discussion

35.	20.ass- displacement current is fictitious current and hasnothing incommonwith conduction current. reason- it proposed by maxwell only to satisfy kirchoff junction rule
Answer» 20.ass- displacement current is fictitious current and hasnothing incommonwith conduction current. reason- it proposed by maxwell only to satisfy kirchoff junction rule

Discussion

36.	What is the SI unit of luminous intensity?
Answer» What is the SI unit of luminous intensity?

Discussion

37.	91. A boy is sitting on the horizontal platform of a joy wheel at a distance of 5 m from the centre. The wheel begins to rotate and when the angular speed exceeds 1 rad/s ,the boy just slips. The coefficient of friction between the boy and the wheel is ?
Answer» 91. A boy is sitting on the horizontal platform of a joy wheel at a distance of 5 m from the centre. The wheel begins to rotate and when the angular speed exceeds 1 rad/s ,the boy just slips. The coefficient of friction between the boy and the wheel is ?

Discussion

38.	The position x of a particle moving along the x-axis at time t is t=root of x +2. find the work done by the force in first 4 sec.??
Answer» The position x of a particle moving along the x-axis at time t is t=root of x +2. find the work done by the force in first 4 sec.??

Discussion

39.	a plano convex lens is floating on a mercury with its plane surface in contact with mercury.Parallax is removed between a pin held at a height of 40cm above lens and image of pin. find radius ofcurved surf ace oflens.(n=1.5)
Answer» a plano convex lens is floating on a mercury with its plane surface in contact with mercury.Parallax is removed between a pin held at a height of 40cm above lens and image of pin. find radius ofcurved surf ace oflens.(n=1.5)

Discussion

40.	How does nuclear force come into existence? Why?
Answer» How does nuclear force come into existence? Why?

Discussion

41.	A wire of length 12L is converted into a equilateral triangle and a square. Find the ratio of magnetic field at the centroid of triangle and centre of square if both are carrying current I.
Answer» A wire of length $12 L$ is converted into a equilateral triangle and a square. Find the ratio of magnetic field at the centroid of triangle and centre of square if both are carrying current $I$ .

Discussion

42.	Two equal forces act on an object. Is this information enough to say which way the object will move? Give reasons.
Answer» Two equal forces act on an object. Is this information enough to say which way the object will move? Give reasons.

Discussion

43.	in a cylindrical capacitor with plate radii a and b the potential difference between the plates is V . the electric field between the plates at a radial dis†an ce r is
Answer» in a cylindrical capacitor with plate radii a and b the potential difference between the plates is V . the electric field between the plates at a radial dis†an ce r is

Discussion

44.	why oxygen in water has two partial negative charges?
Answer» why oxygen in water has two partial negative charges?

Discussion

45.	Match the correct order of elements corresponding to the atomic structure.
Answer» Match the correct order of elements corresponding to the atomic structure.

45.

Match the correct order of elements corresponding to the atomic structure.

Answer»

Match the correct order of elements corresponding to the atomic structure.

Discussion

46.	Q) Use of eddy currents is done in the following except? 1) moving coil galvanometer 2) electric bakes 3) induction motor 4) dynam
Answer» Q) Use of eddy currents is done in the following except? 1) moving coil galvanometer 2) electric bakes 3) induction motor 4) dynam

Discussion

47.	The diagram in the figure shows a cell of e.m.f. ε=2 volt and internal resistance r = 1 ohm connected to an external resistance R = 4 ohm. The ammeter A measures the current in the circuit and the voltmeter V measures the terminal voltage across the cell. What will be the readings of the ammeter and voltmeter when (i) the key K is open, and (ii) the key K is closed?
Answer» The diagram in the figure shows a cell of e.m.f. $ε = 2$ volt and internal resistance r = 1 ohm connected to an external resistance R = 4 ohm. The ammeter A measures the current in the circuit and the voltmeter V measures the terminal voltage across the cell. What will be the readings of the ammeter and voltmeter when (i) the key K is open, and (ii) the key K is closed?

Discussion

48.	5 A vessel has 6 g of oxygen at a pressure P andtemperature 400 K. A small hole is made in it sothat O leaks out How much 0, leaks out if thepressure is P/2 and temperature 300 K?
Answer» 5 A vessel has 6 g of oxygen at a pressure P andtemperature 400 K. A small hole is made in it sothat O leaks out How much 0, leaks out if thepressure is P/2 and temperature 300 K?

Discussion

49.	what is sonemeter wire and fundamental frequency?
Answer» what is sonemeter wire and fundamental frequency?

Discussion

50.	A particle of mass m is thrown upwards from the surface of the earth, with a velocity u. The mass and the radius of the earth are, respectively, M and R. G is gravitational constant and g is acceleration due to gravity on the surface of the earth. The minimum value of u so that the particle does not return back to earth,
Answer» A particle of mass m is thrown upwards from the surface of the earth, with a velocity u. The mass and the radius of the earth are, respectively, M and R. G is gravitational constant and g is acceleration due to gravity on the surface of the earth. The minimum value of u so that the particle does not return back to earth,

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A point object is placed at distance of 26 m from convex lens of focal length 20cm if a glass slab of thickness t and refractive index 1.5 is inserted between the lens and the object the image is formed at Infinity the thickness t is

274. A beam of light in air is incident upon the smoothplane surface of a piece of flint glass making anangle of 30 with its plane If the reflected beamand refracted beam are perpendicular to each other,what is the index of refraction of flint glass withrespect to air?

the dimensions of time in energy ar

In an astronomical telescope in normal adjustment, a straight black line of length L is drawn on the inside part of the objective lens. The eyepiece forms a real image of this line. The length of this image is I. The magnification of the telescope is -

i) Name the rule that is used to find the direction of magnetic field associated with the current carrying conductor ii) is there a similar magnetic field produced around the thin beam of moving a)Alpha particles? justify your answer

A net force of 20N acts on a 5 kg mass kept at rest. Distance travelled by the mass in 6 s is

What is the work done in carrying a charge Q once around a circle of radius r about a charge Q at the center.

A beam of light passes from medium 1 to medium 2 to medium 3 as shown in figure. What may be concluded about the three indices of refraction, n1, n2 and n3 ?

Question 8 (a) Name the type of mirror used in the given situation. Headlights of a car Support your answer with reason.

A metal parallelopiped of measures 16 cm ×11 cm ×10 cm was melted to make coins. How many coins were made if the thickness and diameter of each coin was 2 mm and 2 cm respectively ?

An object of mass 5 kg it blast in 2 segment their masses 2 kg & 3 kg . Total mechanical energy of these 2 object are 600 J determine speeds of these 2 object?

If resistance is halved, the current is doubled. Show.

25.An electric current of 100 A is passed through a molten liquid NaCl for 4 hours. Calculate the volume of chloride gas liberated at electrodes at NTP.

A glass prism of refractive index 1.5 is immersed in water (μ=43). A light beam incident normally on the face AB is totally reflected to reach the face BC if

Why does sky appears blue ?

When an arrow is shot from a bow, it has kinetic energy in it.Explain briefly from where does it get its kinetic energy.

There are three sources of frequency 200hz,201hz,202hz.if all sounded simultaneously then no.of beats per sec

A bulb of resistance 1 ohm is connected across a battery of 10 V. Find the power consumed.

Define the term Lever

In a step up transformer, the ratio of turns of primary to secondary is 5:6 and the primary voltage is 410 V. If the current in the primary is 4 A, then what is the load current?

Light travels from medium X to a medium Y where the bends towards the normal. What happens from the followin a) both the speed and frequency decrease b) speed increases and frequency decreases c) the speed decreases and wavelength decrease d) the speed decreases and wavelength increases

Which statement is not true about the gravitational forces?

Which of the following is used as a safety device?

A wire of resistance R is stretched to twice of its original lenght. Find its new resistance

The expected graphical representation of the variation of angle of deviation ′δ′ with angle of incidence ′i′ in a prism is :

If the direction of current in the conductor and the magnetic field are the same, in which way will the conductor move?

(a) What is the source of energy of ths sun and other stars ? (b) Describe the working of a hydrogen bomb. (c) What is common between the sun and a hydrogen bomb ?

Two charges Q1 and Q2 are separated by a distance D . if both Q1 and D are doubled, the force is-

A 5.0 cm tall light bulb has placed a distance of 50 cm from a convex mirror having a focal length of 10 cm. What is the image height?

Voilet colour has more wave length compared to blue as well as red.Then why doesn't the sky appear voilet in colour ?

wheather we want to take the exact distance mention in the question in scale like an object is placed away from the mirror

20.ass- displacement current is fictitious current and hasnothing incommonwith conduction current. reason- it proposed by maxwell only to satisfy kirchoff junction rule

What is the SI unit of luminous intensity?

91. A boy is sitting on the horizontal platform of a joy wheel at a distance of 5 m from the centre. The wheel begins to rotate and when the angular speed exceeds 1 rad/s ,the boy just slips. The coefficient of friction between the boy and the wheel is ?

The position x of a particle moving along the x-axis at time t is t=root of x +2. find the work done by the force in first 4 sec.??

a plano convex lens is floating on a mercury with its plane surface in contact with mercury.Parallax is removed between a pin held at a height of 40cm above lens and image of pin. find radius ofcurved surf ace oflens.(n=1.5)

How does nuclear force come into existence? Why?

A wire of length 12L is converted into a equilateral triangle and a square. Find the ratio of magnetic field at the centroid of triangle and centre of square if both are carrying current I.

Two equal forces act on an object. Is this information enough to say which way the object will move? Give reasons.

in a cylindrical capacitor with plate radii a and b the potential difference between the plates is V . the electric field between the plates at a radial dis†an ce r is

why oxygen in water has two partial negative charges?

Match the correct order of elements corresponding to the atomic structure.

Q) Use of eddy currents is done in the following except? 1) moving coil galvanometer 2) electric bakes 3) induction motor 4) dynam

5 A vessel has 6 g of oxygen at a pressure P andtemperature 400 K. A small hole is made in it sothat O leaks out How much 0, leaks out if thepressure is P/2 and temperature 300 K?

what is sonemeter wire and fundamental frequency?