16569 + Interview Questions in Physics

1.	ntTwo magnets are held together in a vibration magnetometer and are allowed to oscillate in the earth's magnetic field. With like poles of magnets together,12 oscillations per minute are made but for unlike poles together only 4 oscillations per minute are executed.The ratio of their magnetic moments isn nt1-1:3n nt2-3:1n nt3-3:5n nt4-5:4n
Answer» ntTwo magnets are held together in a vibration magnetometer and are allowed to oscillate in the earth's magnetic field. With like poles of magnets together,12 oscillations per minute are made but for unlike poles together only 4 oscillations per minute are executed.The ratio of their magnetic moments isn nt1-1:3n nt2-3:1n nt3-3:5n nt4-5:4n

Discussion

2.	A nucleus breaks into two parts whose velocities are in the ratio 2 : 1. The ratio of their radius is
Answer» A nucleus breaks into two parts whose velocities are in the ratio 2 : 1. The ratio of their radius is

Discussion

3.	what is displacement method and dispersion of light?
Answer» what is displacement method and dispersion of light?

Discussion

4.	How can capacitors can work both on Ac and c.
Answer» How can capacitors can work both on Ac and c.

Discussion

5.	A 4kg block is put on top of a 5 kg block. Assuming frictionless table the maximum horizontal forceF which can be applied to the lower block so that the blocks, will move together should be
Answer» A 4kg block is put on top of a 5 kg block. Assuming frictionless table the maximum horizontal force F which can be applied to the lower block so that the blocks, will move together should be

Discussion

6.	Which is better recycle or reuse ?give reasons
Answer» Which is better recycle or reuse ?give reasons

Discussion

7.	An electron is moving vertically downward, deflection of electron due to earth's vertical magnetic field is towards
Answer» An electron is moving vertically downward, deflection of electron due to earth's vertical magnetic field is towards

Discussion

8.	When an electron accelerated through potential difference V. Itexperiences a force F through uniform tranverse magnetic field. If the potential difference is increasincreased to 2V, the force experienced by the electron in magnetic field is :-(a) 2F (b) 2^1/2 F(c) 22^1/2 F. (d) 4 F
Answer» When an electron accelerated through potential difference V. Itexperiences a force F through uniform tranverse magnetic field. If the potential difference is increasincreased to 2V, the force experienced by the electron in magnetic field is :- (a) 2F (b) 2^1/2 F (c) 22^1/2 F. (d) 4 F

Discussion

9.	2 thin convex lenses, each of focal length f are placed in contact coaxially. The focal length of combination is F1. When the space between the surface of the lenses are filled with the same material of which the lens are made, the equivalent focal length becomes F2. What is the ratio of F1 and F2?
Answer» 2 thin convex lenses, each of focal length f are placed in contact coaxially. The focal length of combination is F1. When the space between the surface of the lenses are filled with the same material of which the lens are made, the equivalent focal length becomes F2. What is the ratio of F1 and F2?

Discussion

10.	The equivalent resistance of a group of resistances is R. If another resistance is connected in parallel to the group, its new equivalent becomes R1 & if it is connected in series to the group, its new equivalent becomes R2. We have
Answer» The equivalent resistance of a group of resistances is $R$ . If another resistance is connected in parallel to the group, its new equivalent becomes $R_{1}$ & if it is connected in series to the group, its new equivalent becomes $R_{2}$ . We have

Discussion

11.	What is monochromatic light?
Answer» What is monochromatic light?

Discussion

12.	the ratio of intensities of 1st and 2nd subsidary maxima in a diffraction pattern obtained by single slit is
Answer» the ratio of intensities of 1st and 2nd subsidary maxima in a diffraction pattern obtained by single slit is

Discussion

13.	24. A resistance 160 Ohm is in series with a coil connected to a voltage supply of 220 volt .find average power consumed in coil if the voltage across the resistor and coil is 80 volt and 180 volt respectively.
Answer» 24. A resistance 160 Ohm is in series with a coil connected to a voltage supply of 220 volt .find average power consumed in coil if the voltage across the resistor and coil is 80 volt and 180 volt respectively.

Discussion

14.	Give reasons why the terminal voltage is less than the emf of a cell.
Answer» Give reasons why the terminal voltage is less than the emf of a cell.

Discussion

15.	33.A block of mass m1 is pulled along a horizontal frictionless surface by a rope of mass m1, if a force F is applied at the free end of the rope, the force exerted by the rope on the block is
Answer» 33.A block of mass m1 is pulled along a horizontal frictionless surface by a rope of mass m1, if a force F is applied at the free end of the rope, the force exerted by the rope on the block is

Discussion

16.	Define absolute refractive index of a medium and relative refractive index.
Answer» Define absolute refractive index of a medium and relative refractive index.

Discussion

17.	An atomic nucleus A is composed of 84 protons and 128 neutrons. (i)The nucleus A emits an alpha particle and is transformed into nucleus B. What is the composition of nucleus B? (ii) The nucleus B emits a beta particle and is transformed into a nucleus C. What is the composition of nucleus C? (iii) Does the composition of nucleus C change if it emits gamma radiations? [5 MARKS]
Answer» An atomic nucleus A is composed of 84 protons and 128 neutrons. (i)The nucleus A emits an alpha particle and is transformed into nucleus B. What is the composition of nucleus B? (ii) The nucleus B emits a beta particle and is transformed into a nucleus C. What is the composition of nucleus C? (iii) Does the composition of nucleus C change if it emits gamma radiations? [5 MARKS]

Discussion

18.	A uniform sphere of mass M and radius R is surrounded by a concentric spherical shell of same mass M but radius 2R . A point mass m is kept at a dis†an ce x where R
Answer» A uniform sphere of mass M and radius R is surrounded by a concentric spherical shell of same mass M but radius 2R . A point mass m is kept at a dis†an ce x where R

Discussion

19.	Why the deflection inside the coil increases if we insert an iron rod?
Answer» Why the deflection inside the coil increases if we insert an iron rod?

Discussion

20.	Three identical large plates are placed parallel to each other at a very small separation as shown in the figure. The central plate is given a charge Q. What amount of charge will flow to earth when the key is closed.(The other two plates are initially neutral)
Answer» Three identical large plates are placed parallel to each other at a very small separation as shown in the figure. The central plate is given a charge $Q$ . What amount of charge will flow to earth when the key is closed.(The other two plates are initially neutral)

Discussion

21.	A small piece of glass found at a crime scene is placed in a beaker full of oil & the oil is gently warmed. At one temperature the glass piece seems to disappear. Why?
Answer» A small piece of glass found at a crime scene is placed in a beaker full of oil & the oil is gently warmed. At one temperature the glass piece seems to disappear. Why?

Discussion

22.	What were the drawbacks of Rutherford's model of an atom?
Answer» What were the drawbacks of Rutherford's model of an atom?

Discussion

23.	A dentist uses a concave mirror of radius of curvature 3 cm, and places an object at a distance of x cm from the mirror to get a magnification of +5. What is the value of x.
Answer» A dentist uses a concave mirror of radius of curvature 3 cm, and places an object at a distance of x cm from the mirror to get a magnification of +5. What is the value of x.

Discussion

24.	Which of the following formula correctly describes Rayleigh scattering of light from the gas molecules?I is the intensity of scattered light and λ is the wavelength of light.
Answer» Which of the following formula correctly describes Rayleigh scattering of light from the gas molecules? $I$ is the intensity of scattered light and $λ$ is the wavelength of light.

Discussion

25.	In a system of units energy E, density d, and power P, are taken as fundamental units then the dimensional formula of universal gravitational constant G,will be
Answer» In a system of units energy E, density d, and power P, are taken as fundamental units then the dimensional formula of universal gravitational constant G,will be

Discussion

26.	Statement 1: The chamber just behind the cornea consists of vitreous humour.Statement 2: Melanin is present in the choroid layer of the eye.
Answer» Statement 1: The chamber just behind the cornea consists of vitreous humour. Statement 2: Melanin is present in the choroid layer of the eye.

26.

Statement 1: The chamber just behind the cornea consists of vitreous humour.Statement 2: Melanin is present in the choroid layer of the eye.

Answer»

Statement 1: The chamber just behind the cornea consists of vitreous humour.

Statement 2: Melanin is present in the choroid layer of the eye.

Discussion

27.

The following observations were made for a two phase traffic signal: Road Average normal flow (veh/hr) Saturation flow (veh/hr) A 400 1250 B 250 1000 The all red time required for pedestrian crossing is 12 sec and amber time is 2.0 sec for each lane. The optimum cycle time will be _______ sec. [Use Webster's approach]67.4

Answer» The following observations were made for a two phase traffic signal:

Road	Average normal flow (veh/hr)	Saturation flow (veh/hr)
A	400	1250
B	250	1000

The all red time required for pedestrian crossing is 12 sec and amber time is 2.0 sec for each lane.

The optimum cycle time will be _______ sec. [Use Webster's approach]

67.4

Discussion

28.	20.Radius of a circular loop placed in a perpendicular uniform magnetic field is increasing at a constant rateo ro ms-1. If at any instant radius of the loop is r, then emf induced in the loop at that instant will be0
Answer» 20.Radius of a circular loop placed in a perpendicular uniform magnetic field is increasing at a constant rateo ro ms-1. If at any instant radius of the loop is r, then emf induced in the loop at that instant will be0

Discussion

29.	A half-wave rectifier is used to supply 10V DC to a resister load of 100 Ω. If the forward resistance of diode is 25 Ω. Then the value of AC voltage supplied to the circuit is
Answer» A half-wave rectifier is used to supply 10V DC to a resister load of 100 Ω. If the forward resistance of diode is 25 Ω. Then the value of AC voltage supplied to the circuit is

Discussion

30.	13. The maximum efficiency of a full wave rectifier is(1)410%(2)100 %2(3)40%(4)80%
Answer» 13. The maximum efficiency of a full wave rectifier is(1)410%(2)100 %2(3)40%(4)80%

Discussion

31.	Which of the following is the best set-up for tracing the path of a ray of light through a rectangular glass slab?(1) A(2) B(3) C(4) D
Answer» Which of the following is the best set-up for tracing the path of a ray of light through a rectangular glass slab? (1) A (2) B (3) C (4) D

Discussion

32.	25. If a light ray incident normally on one of the faces of a Prism of refractive index 2 and the emergent ray just graces the second face of the prism, then the angle of deviation is?
Answer» 25. If a light ray incident normally on one of the faces of a Prism of refractive index 2 and the emergent ray just graces the second face of the prism, then the angle of deviation is?

Discussion

33.	Which of the following options correctly labels the given diagram of a solar cooker?
Answer» Which of the following options correctly labels the given diagram of a solar cooker?

Discussion

34.	An AC source is given by V=2sin(t) V. It is connected across a diode and a resistor of resistance 2 Ω as shown in the figure below. Find the current through the circuit at t=π6 and t=5π6 respectively. Assume zero resistance of diode in forward biasing and infinite resistance in reverse biasing.
Answer» An $A C$ source is given by $V = 2 sin (t) V$ . It is connected across a diode and a resistor of resistance $2 Ω$ as shown in the figure below. Find the current through the circuit at $t = \frac{π}{6}$ and $t = \frac{5 π}{6}$ respectively. Assume zero resistance of diode in forward biasing and infinite resistance in reverse biasing.

Discussion

35.	When an object is placed at the principal focus of a concave mirror, the image is formed at...............
Answer» When an object is placed at the principal focus of a concave mirror, the image is formed at...............

Discussion

36.	A planar loop of rectangular shape is moved within the region of a uniform magnetic fieldacting perpendicular to its plane. What is the direction and magnitude of the currentinduced in it?
Answer» A planar loop of rectangular shape is moved within the region of a uniform magnetic field acting perpendicular to its plane. What is the direction and magnitude of the current induced in it?

Discussion

37.	At 27 degree Celsius a gas is compressed suddenly such that pressure becomes 1/8 of its original pressure final temperature will be( gamma=5/3)
Answer» At 27 degree Celsius a gas is compressed suddenly such that pressure becomes 1/8 of its original pressure final temperature will be( gamma=5/3)

Discussion

38.	A stone is projected vertically up to reach a max height 'h'. What is the ratio of its kinetic energy to potential energy at a height 4h/5?
Answer» A stone is projected vertically up to reach a max height 'h'. What is the ratio of its kinetic energy to potential energy at a height 4h/5?

Discussion

39.	A body has -80 micro coulomb of charge. Number ofadditional electrons in it will be(a) 8 x 10-5(c) 5 x104(b) 80x10-17(d) 1.28 x10-17
Answer» A body has -80 micro coulomb of charge. Number ofadditional electrons in it will be(a) 8 x 10-5(c) 5 x104(b) 80x10-17(d) 1.28 x10-17

Discussion

40.	When we enter in a dark room from a bright area, our vision is impaired for few seconds. Why does this happen?
Answer» When we enter in a dark room from a bright area, our vision is impaired for few seconds. Why does this happen?

Discussion

41.	The focal length of a bi-convex lens is 20 cm and its refractive index is 1.5. If the radii of curvatures of two surfaces of lens are in the ratio 1:2, then the value of the larger radius of curvature is:(in cm)
Answer» The focal length of a bi-convex lens is $20 cm$ and its refractive index is $1.5$ . If the radii of curvatures of two surfaces of lens are in the ratio $1 : 2$ , then the value of the larger radius of curvature is: $(in cm)$

Discussion

42.	21. 6 ohm and 12 ohm resistors are connected in parallel. This combination is connected to series with a 10v battery and 6 ohm resistor. what is the potential difference between the terminals of the 12 ohm resistor?(wth steps)
Answer» 21. 6 ohm and 12 ohm resistors are connected in parallel. This combination is connected to series with a 10v battery and 6 ohm resistor. what is the potential difference between the terminals of the 12 ohm resistor?(wth steps)

Discussion

43.	When a body vibrates under a periodic force, the vibration of the body is called:
Answer» When a body vibrates under a periodic force, the vibration of the body is called:

Discussion

44.	Two concentric coils each of radius equal to 2π cm are placed right angles to each other. If 3A and 4A are the currents flowing through the two coils respectively.The magnetic induction (in WB/M2)at the centre of the coils will be(Solution with diagram)
Answer» Two concentric coils each of radius equal to 2π cm are placed right angles to each other. If 3A and 4A are the currents flowing through the two coils respectively. The magnetic induction (in WB/M2)at the centre of the coils will be (Solution with diagram)

Discussion

45.	Question 13The focal length of the eye lens increases when eye muscles (a) are relaxed and lens becomes thinner (b) contract and lens becomes thicker (c) are relaxed and lens becomes thicker (d) contract and lens becomes thinner
Answer» Question 13 The focal length of the eye lens increases when eye muscles (a) are relaxed and lens becomes thinner (b) contract and lens becomes thicker (c) are relaxed and lens becomes thicker (d) contract and lens becomes thinner

Discussion

46.	In a convex spherical mirror, reflection of light takes place at : (a) a flat surface (b) a bent-in surface (c) a bulging-out surface (d) an uneven surface
Answer» In a convex spherical mirror, reflection of light takes place at : (a) a flat surface (b) a bent-in surface (c) a bulging-out surface (d) an uneven surface

Discussion

47.	2. A wire is stretched so as to change its diameter by 0▪25 % the percentage change in resistance is
Answer» 2. A wire is stretched so as to change its diameter by 0▪25 % the percentage change in resistance is

Discussion

48.	How does the refractive index of a medium depend on the wavelength of light used?
Answer» How does the refractive index of a medium depend on the wavelength of light used?

Discussion

49.	In the given figure, A, B and C are three ammeters. The ammeter ‘B’ reads 0.5 A. (All the ammeters have negligible resistance): The Readings in ammeters A and C are:
Answer» In the given figure, A, B and C are three ammeters. The ammeter ‘B’ reads 0.5 A. (All the ammeters have negligible resistance): The Readings in ammeters A and C are:

49.

In the given figure, A, B and C are three ammeters. The ammeter ‘B’ reads 0.5 A. (All the ammeters have negligible resistance): The Readings in ammeters A and C are:

Answer»

In the given figure, A, B and C are three ammeters. The ammeter ‘B’ reads 0.5 A. (All the ammeters have negligible resistance):

The Readings in ammeters A and C are:

Discussion

50.	Current sensitivity of a moving coil galvanometer is 5 div/mA and its voltage sensitivity (angular deflection per unit voltage applied) is 20 div/V. The resistance of the galvanometer is
Answer» Current sensitivity of a moving coil galvanometer is $5 d i v / m A$ and its voltage sensitivity (angular deflection per unit voltage applied) is $20 d i v / V$ . The resistance of the galvanometer is

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A nucleus breaks into two parts whose velocities are in the ratio 2 : 1. The ratio of their radius is

what is displacement method and dispersion of light?

How can capacitors can work both on Ac and c.

A 4kg block is put on top of a 5 kg block. Assuming frictionless table the maximum horizontal forceF which can be applied to the lower block so that the blocks, will move together should be

Which is better recycle or reuse ?give reasons

An electron is moving vertically downward, deflection of electron due to earth's vertical magnetic field is towards

When an electron accelerated through potential difference V. Itexperiences a force F through uniform tranverse magnetic field. If the potential difference is increasincreased to 2V, the force experienced by the electron in magnetic field is :-(a) 2F (b) 2^1/2 F(c) 22^1/2 F. (d) 4 F

2 thin convex lenses, each of focal length f are placed in contact coaxially. The focal length of combination is F1. When the space between the surface of the lenses are filled with the same material of which the lens are made, the equivalent focal length becomes F2. What is the ratio of F1 and F2?

The equivalent resistance of a group of resistances is R. If another resistance is connected in parallel to the group, its new equivalent becomes R1 &amp; if it is connected in series to the group, its new equivalent becomes R2. We have

What is monochromatic light?

the ratio of intensities of 1st and 2nd subsidary maxima in a diffraction pattern obtained by single slit is

24. A resistance 160 Ohm is in series with a coil connected to a voltage supply of 220 volt .find average power consumed in coil if the voltage across the resistor and coil is 80 volt and 180 volt respectively.

Give reasons why the terminal voltage is less than the emf of a cell.

33.A block of mass m1 is pulled along a horizontal frictionless surface by a rope of mass m1, if a force F is applied at the free end of the rope, the force exerted by the rope on the block is

Define absolute refractive index of a medium and relative refractive index.

A uniform sphere of mass M and radius R is surrounded by a concentric spherical shell of same mass M but radius 2R . A point mass m is kept at a dis†an ce x where R

Why the deflection inside the coil increases if we insert an iron rod?

Three identical large plates are placed parallel to each other at a very small separation as shown in the figure. The central plate is given a charge Q. What amount of charge will flow to earth when the key is closed.(The other two plates are initially neutral)

A small piece of glass found at a crime scene is placed in a beaker full of oil &amp; the oil is gently warmed. At one temperature the glass piece seems to disappear. Why?

What were the drawbacks of Rutherford's model of an atom?

A dentist uses a concave mirror of radius of curvature 3 cm, and places an object at a distance of x cm from the mirror to get a magnification of +5. What is the value of x.

Which of the following formula correctly describes Rayleigh scattering of light from the gas molecules?I is the intensity of scattered light and λ is the wavelength of light.

In a system of units energy E, density d, and power P, are taken as fundamental units then the dimensional formula of universal gravitational constant G,will be

Statement 1: The chamber just behind the cornea consists of vitreous humour.Statement 2: Melanin is present in the choroid layer of the eye.

20.Radius of a circular loop placed in a perpendicular uniform magnetic field is increasing at a constant rateo ro ms-1. If at any instant radius of the loop is r, then emf induced in the loop at that instant will be0

A half-wave rectifier is used to supply 10V DC to a resister load of 100 Ω. If the forward resistance of diode is 25 Ω. Then the value of AC voltage supplied to the circuit is

13. The maximum efficiency of a full wave rectifier is(1)410%(2)100 %2(3)40%(4)80%

Which of the following is the best set-up for tracing the path of a ray of light through a rectangular glass slab?(1) A(2) B(3) C(4) D

25. If a light ray incident normally on one of the faces of a Prism of refractive index 2 and the emergent ray just graces the second face of the prism, then the angle of deviation is?

Which of the following options correctly labels the given diagram of a solar cooker?

An AC source is given by V=2sin(t) V. It is connected across a diode and a resistor of resistance 2 Ω as shown in the figure below. Find the current through the circuit at t=π6 and t=5π6 respectively. Assume zero resistance of diode in forward biasing and infinite resistance in reverse biasing.

When an object is placed at the principal focus of a concave mirror, the image is formed at...............

A planar loop of rectangular shape is moved within the region of a uniform magnetic fieldacting perpendicular to its plane. What is the direction and magnitude of the currentinduced in it?

At 27 degree Celsius a gas is compressed suddenly such that pressure becomes 1/8 of its original pressure final temperature will be( gamma=5/3)

A stone is projected vertically up to reach a max height 'h'. What is the ratio of its kinetic energy to potential energy at a height 4h/5?

A body has -80 micro coulomb of charge. Number ofadditional electrons in it will be(a) 8 x 10-5(c) 5 x104(b) 80x10-17(d) 1.28 x10-17

When we enter in a dark room from a bright area, our vision is impaired for few seconds. Why does this happen?

The focal length of a bi-convex lens is 20 cm and its refractive index is 1.5. If the radii of curvatures of two surfaces of lens are in the ratio 1:2, then the value of the larger radius of curvature is:(in cm)

21. 6 ohm and 12 ohm resistors are connected in parallel. This combination is connected to series with a 10v battery and 6 ohm resistor. what is the potential difference between the terminals of the 12 ohm resistor?(wth steps)

When a body vibrates under a periodic force, the vibration of the body is called:

Two concentric coils each of radius equal to 2π cm are placed right angles to each other. If 3A and 4A are the currents flowing through the two coils respectively.The magnetic induction (in WB/M2)at the centre of the coils will be(Solution with diagram)

Question 13The focal length of the eye lens increases when eye muscles (a) are relaxed and lens becomes thinner (b) contract and lens becomes thicker (c) are relaxed and lens becomes thicker (d) contract and lens becomes thinner

In a convex spherical mirror, reflection of light takes place at : (a) a flat surface (b) a bent-in surface (c) a bulging-out surface (d) an uneven surface

2. A wire is stretched so as to change its diameter by 0▪25 % the percentage change in resistance is

How does the refractive index of a medium depend on the wavelength of light used?

In the given figure, A, B and C are three ammeters. The ammeter ‘B’ reads 0.5 A. (All the ammeters have negligible resistance): The Readings in ammeters A and C are:

Current sensitivity of a moving coil galvanometer is 5 div/mA and its voltage sensitivity (angular deflection per unit voltage applied) is 20 div/V. The resistance of the galvanometer is

The equivalent resistance of a group of resistances is R. If another resistance is connected in parallel to the group, its new equivalent becomes R1 & if it is connected in series to the group, its new equivalent becomes R2. We have

A small piece of glass found at a crime scene is placed in a beaker full of oil & the oil is gently warmed. At one temperature the glass piece seems to disappear. Why?