16569 + Interview Questions in Physics

1.	In the given diagram, if the arrow shows the direction of current then where will the north- pole is assumed to be
Answer» In the given diagram, if the arrow shows the direction of current then where will the north- pole is assumed to be

1.

In the given diagram, if the arrow shows the direction of current then where will the north- pole is assumed to be

Answer»

In the given diagram, if the arrow shows the direction of current then where will the north- pole is assumed to be

2.	34.Choose the correct statement about the circuit given below - (1)power delivered by 8V battery is 16W (2)power consumed by 2V battery is 8V (3)power dissipated in 1ohm resistance is 4W (4)both (1) and (3)
Answer» 34.Choose the correct statement about the circuit given below - (1)power delivered by 8V battery is 16W (2)power consumed by 2V battery is 8V (3)power dissipated in 1ohm resistance is 4W (4)both (1) and (3)

Discussion

3.	Describe how you could demonstrate that white light is composed of a number of colours.
Answer» Describe how you could demonstrate that white light is composed of a number of colours.

Discussion

4.	1 how does plasma works in bulb and sun
Answer» 1 how does plasma works in bulb and sun

Discussion

5.	31. Why first line Lyman series has maximum wavelength while energy change is inversely proportional to lambda.
Answer» 31. Why first line Lyman series has maximum wavelength while energy change is inversely proportional to lambda.

Discussion

6.	Which wire has a red insulation in an electrical wiring?
Answer» Which wire has a red insulation in an electrical wiring?

Discussion

7.	charge on the electron will move in a circle, so there is in fact a current, and that current will generate a magnetic field.how?
Answer» charge on the electron will move in a circle, so there is in fact a current, and that current will generate a magnetic field.how?

Discussion

8.	If a wire of resistance 10Ω is cut along its length such that its radius becomes half of it's value then what will be the new resistance?
Answer» If a wire of resistance $10 Ω$ is cut along its length such that its radius becomes half of it's value then what will be the new resistance?

Discussion

9.	What is the difference between normal reflection and total internal reflection
Answer» What is the difference between normal reflection and total internal reflection

Discussion

10.	What is the speed of electricity ?
Answer» What is the speed of electricity ?

Discussion

11.	What is the relation between magnification and focal length of a spherical lens?
Answer» What is the relation between magnification and focal length of a spherical lens?

Discussion

12.	Question 29Draw a ray diagram showing the path of rays of light when it enters with oblique incidence (i) from air into water; (ii) from water into air.
Answer» Question 29 Draw a ray diagram showing the path of rays of light when it enters with oblique incidence (i) from air into water; (ii) from water into air.

Discussion

13.	A 10 eV electron is circulating in a plane at right angles to a uniform field of magnetic induction 10^-4 Wb/m² (= 1.0 gauss), the orbital radius of electron is
Answer» A 10 eV electron is circulating in a plane at right angles to a uniform field of magnetic induction 10^-4 Wb/m² (= 1.0 gauss), the orbital radius of electron is

Discussion

14.	a spherical mirror forms three times magnified real image of AN object placeed in front of it. If the focus is situated at a distance of 9cm from the pole, calculate how far the image is situated. What type of mirror is used
Answer» a spherical mirror forms three times magnified real image of AN object placeed in front of it. If the focus is situated at a distance of 9cm from the pole, calculate how far the image is situated. What type of mirror is used

Discussion

15.	As light rays pass from water into glass, are they refracted towards the normal or away from the normal?
Answer» As light rays pass from water into glass, are they refracted towards the normal or away from the normal?

Discussion

16.	When travelling obliquely from one optical medium to another optical medium, the direction of light rays in the second medium _____________.
Answer» When travelling obliquely from one optical medium to another optical medium, the direction of light rays in the second medium _____________.

Discussion

17.	three charges are placed on the vertices of the equilateral triangle of side length l. find the sign and magnitude of charge q placed at the centroid so that the system of charges will be in equilibrium
Answer» three charges are placed on the vertices of the equilateral triangle of side length l. find the sign and magnitude of charge q placed at the centroid so that the system of charges will be in equilibrium

Discussion

18.	13 A circular coiil carrying a certain current produces a magnetic field Bo at its centre. The coil is now rewoundso as to have 3 turns and the same current is passed through it. The new magnetic field at the centre is
Answer» 13 A circular coiil carrying a certain current produces a magnetic field Bo at its centre. The coil is now rewoundso as to have 3 turns and the same current is passed through it. The new magnetic field at the centre is

Discussion

19.	How do we see things around us? How do we see colors? Suppose you are in a room, which has four boxes - black, white, red and blue. If the room is illuminated by red light, what color will the boxes appear?
Answer» How do we see things around us? How do we see colors? Suppose you are in a room, which has four boxes - black, white, red and blue. If the room is illuminated by red light, what color will the boxes appear?

Discussion

20.	55.At what hight above the earth surface does the value of g becomes 36%of the value at the surface of earth? (a) 2R/5 (b) 2R/3 (c) 3R/7 (d) R/3
Answer» 55.At what hight above the earth surface does the value of g becomes 36%of the value at the surface of earth? (a) 2R/5 (b) 2R/3 (c) 3R/7 (d) R/3

Discussion

21.	62 A 250ml sample of a 0.20M Cr3+ is electrolyzed with a current of 96.5A.If the remaining (Cr3+)is 0.1M the duration of process is:-
Answer» 62 A 250ml sample of a 0.20M Cr3+ is electrolyzed with a current of 96.5A.If the remaining (Cr3+)is 0.1M the duration of process is:-

Discussion

22.	The mutual inductance between a primary and secondary coil is 0.5 H. The resistance of the primary and the secondary coils are 20 Ω and 5 Ω respectively. To generate a current of 0.4 A in the secondary coil, current in the primary must be changed at a rate of-
Answer» The mutual inductance between a primary and secondary coil is $0.5 H$ . The resistance of the primary and the secondary coils are $20 Ω$ and $5 Ω$ respectively. To generate a current of $0.4 A$ in the secondary coil, current in the primary must be changed at a rate of-

Discussion

23.	A body weighs 120 N at a height equal to the radius of the Earth. Its weight on the Earth's surface will be -
Answer» A body weighs $120 N$ at a height equal to the radius of the Earth. Its weight on the Earth's surface will be -

Discussion

24.	Consider a plane diaphragm which is a source of plane wave-fronts. (These wave-fronts are corresponding pressure maximas.) A stationary detector is placed in front of the source and detects a frequency 'f'. Assume initially the medium in which the waves propagate is also in rest and under initial conditions the seperation between successive wavefronts is 'l'. What are the changes in the values of 'l' and 'f' when [i] The source and medium both move towards the detector with the same velocity.[ii] The source moves towards the detector and the medium moves away from the detector with the same velocity.[iii] The source and medium both move towards the detector with different velocity.[iv] The source moves towards the detector and the medium moves away from the detector with different velocity.Explain with reasons.
Answer» Consider a plane diaphragm which is a source of plane wave-fronts. (These wave-fronts are corresponding pressure maximas.) A stationary detector is placed in front of the source and detects a frequency 'f'. Assume initially the medium in which the waves propagate is also in rest and under initial conditions the seperation between successive wavefronts is 'l'. What are the changes in the values of 'l' and 'f' when [i] The source and medium both move towards the detector with the same velocity. [ii] The source moves towards the detector and the medium moves away from the detector with the same velocity. [iii] The source and medium both move towards the detector with different velocity. [iv] The source moves towards the detector and the medium moves away from the detector with different velocity. Explain with reasons.

Discussion

25.	A wire of resistance 3ohmand length 10cm is stretched to length 30cm.Assuming uniform cross section,new resistance?
Answer» A wire of resistance 3ohmand length 10cm is stretched to length 30cm.Assuming uniform cross section,new resistance?

Discussion

26.	how much energy is gained by an electron accelerated through potential difference of 3 ×10^2 V?
Answer» how much energy is gained by an electron accelerated through potential difference of 3 ×10^2 V?

Discussion

27.	State the laws of reflection and describe an experiment to verify them.
Answer» State the laws of reflection and describe an experiment to verify them.

Discussion

28.	Refractive indices of carbon disulphide and ethyl alcohol are 1.63 and 1.36 respectively. Which is optically denser?
Answer» Refractive indices of carbon disulphide and ethyl alcohol are 1.63 and 1.36 respectively. Which is optically denser?

Discussion

29.	1.what is a purpose of using the transformer? Can it be used with both current sources? 2. How can you determine the direction of magnetic field line by a straight wire?
Answer» 1.what is a purpose of using the transformer? Can it be used with both current sources? 2. How can you determine the direction of magnetic field line by a straight wire?

29.

1.what is a purpose of using the transformer? Can it be used with both current sources? 2. How can you determine the direction of magnetic field line by a straight wire?

Answer»

1.what is a purpose of using the transformer? Can it be used with both current sources?

2. How can you determine the direction of magnetic field line by a straight wire?

Discussion

30.	The wavelength of radiation emitted , when in He+ electron falls from infinity to stationary state would be ________.
Answer» The wavelength of radiation emitted , when in He+ electron falls from infinity to stationary state would be ________.

Discussion

31.	17.In the given figure initially the capacitor uncharged ratio of current t-0 and t-infinte will be
Answer» 17.In the given figure initially the capacitor uncharged ratio of current t-0 and t-infinte will be

Discussion

32.	When ice melts without any change in temperature at its melting point
Answer» When ice melts without any change in temperature at its melting point

Discussion

33.	The bells of a temple are big in size. Why?
Answer» The bells of a temple are big in size. Why?

Discussion

34.	why do same current flows through all resistors in series connection but not in parallel connection??
Answer» why do same current flows through all resistors in series connection but not in parallel connection??

Discussion

35.	A square loop of wire, side length 10 cm is placed at angle of 45^° with a magnetic field that changes uniformly from 0.1 T to zero in 0.7 second. The induced current in the loop (its resis†an ce is 1 Ω) is
Answer» A square loop of wire, side length 10 cm is placed at angle of 45^° with a magnetic field that changes uniformly from 0.1 T to zero in 0.7 second. The induced current in the loop (its resis†an ce is 1 Ω) is

Discussion

36.	55. The distance between an object and a screen is 80 cm.If a 3 times magnified image is formed on the screen.Calculate the object distance,Focal length and the image distance.
Answer» 55. The distance between an object and a screen is 80 cm.If a 3 times magnified image is formed on the screen.Calculate the object distance,Focal length and the image distance.

Discussion

37.	How does the refractive index of a medium depend on its temperature?
Answer» How does the refractive index of a medium depend on its temperature?

Discussion

38.	Why does the sky appears blue?
Answer» Why does the sky appears blue?

Discussion

39.	Which component has the biggest size in the transistor?
Answer» Which component has the biggest size in the transistor?

Discussion

40.	A current of 2 A exists in a square loop of edge 10 cm. Find the magnetic field B at the centre of the square loop
Answer» A current of 2 A exists in a square loop of edge 10 cm. Find the magnetic field B at the centre of the square loop

Discussion

41.	A conducting ring of radius r is placed perpendicularly inside a time varying magnetic field given by B=B+α t.B and α are positive constants. E.m.f. induced in the ring is
Answer» A conducting ring of radius r is placed perpendicularly inside a time varying magnetic field given by B=B+α t.B and α are positive constants. E.m.f. induced in the ring is

Discussion

42.	A convex lens of focal length 30 cm is in contact with a concave lens of focal length 40cm the focal length of the combinationa co
Answer» A convex lens of focal length 30 cm is in contact with a concave lens of focal length 40cm the focal length of the combinationa co

Discussion

43.	The sailors felt depressed on reaching the land of mist and snow because…… i. there was no sign of any living creature ii. they felt they would die in that cold weather iii. they were surrounded by icebergs and there seemed to be no sign of life iv. everything was grey in colour and they felt very cold
Answer» The sailors felt depressed on reaching the land of mist and snow because…… i. there was no sign of any living creature ii. they felt they would die in that cold weather iii. they were surrounded by icebergs and there seemed to be no sign of life iv. everything was grey in colour and they felt very cold

43.

The sailors felt depressed on reaching the land of mist and snow because…… i. there was no sign of any living creature ii. they felt they would die in that cold weather iii. they were surrounded by icebergs and there seemed to be no sign of life iv. everything was grey in colour and they felt very cold

Answer»

The
sailors felt depressed on reaching the land of mist and snow
because……

i.
there was no sign of any living creature

ii.
they felt they would die in that cold weather

iii.
they were surrounded by icebergs and there seemed to be no sign of
life

iv.
everything was grey in colour and they felt very cold

Discussion

44.	An electric heater of resistance 8Ω draws 15 A from the service mains 2 hours. Calculate the rate at which heat is developed in the heater.
Answer» An electric heater of resistance $8 Ω$ draws 15 A from the service mains 2 hours. Calculate the rate at which heat is developed in the heater.

Discussion

45.	TWO MASSES OF 10 KGAND 20 KG ARE CONNECTED BY MASSLESS SPRINGA FORCE OF 200N ACTS ON 20 KG.AT A CERTAIN INSTANTTHE ACCELERATION OF 10 KG MASS IS12 M/S.THE ACCELERATION OF 20 KGMASS AT INSTANT IS
Answer» TWO MASSES OF 10 KGAND 20 KG ARE CONNECTED BY MASSLESS SPRINGA FORCE OF 200N ACTS ON 20 KG.AT A CERTAIN INSTANTTHE ACCELERATION OF 10 KG MASS IS12 M/S.THE ACCELERATION OF 20 KGMASS AT INSTANT IS

Discussion

46.	Question 18Arabari forests of Bengal is dominated by(a) Teak(b) Sal(c) Bamboo(d) Mangroove
Answer» Question 18 Arabari forests of Bengal is dominated by (a) Teak (b) Sal (c) Bamboo (d) Mangroove

Discussion

47.	A particle of mass M is released in vertical plane from a point P at x = x0 on the axis it falls vertically along the y-axis. Find the torque τ acting on the particle at a time t about origin?
Answer» A particle of mass M is released in vertical plane from a point P at $x$ = $x_{0}$ on the axis it falls vertically along the y-axis. Find the torque $τ$ acting on the particle at a time t about origin?

47.

A particle of mass M is released in vertical plane from a point P at x = x0 on the axis it falls vertically along the y-axis. Find the torque τ acting on the particle at a time t about origin?

Answer»

A particle of mass M is released in vertical plane from a point P at $x$ = $x_{0}$ on the axis it falls vertically

along the y-axis. Find the torque $τ$ acting on the particle at a time t about origin?

Discussion

48.	What is the purpose of momentum?
Answer» What is the purpose of momentum?

Discussion

49.	lmpor†an t points on semiconducting diode
Answer» lmpor†an t points on semiconducting diode

Discussion

50.	A dentist's mirror has radius of curvature 3 cm. How far must it be placed from a small dental cavity to give a virtual image of the cavity that is magnified 5 times?
Answer» A dentist's mirror has radius of curvature 3 cm. How far must it be placed from a small dental cavity to give a virtual image of the cavity that is magnified 5 times?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

In the given diagram, if the arrow shows the direction of current then where will the north- pole is assumed to be

34.Choose the correct statement about the circuit given below - (1)power delivered by 8V battery is 16W (2)power consumed by 2V battery is 8V (3)power dissipated in 1ohm resistance is 4W (4)both (1) and (3)

Describe how you could demonstrate that white light is composed of a number of colours.

1 how does plasma works in bulb and sun

31. Why first line Lyman series has maximum wavelength while energy change is inversely proportional to lambda.

Which wire has a red insulation in an electrical wiring?

charge on the electron will move in a circle, so there is in fact a current, and that current will generate a magnetic field.how?

If a wire of resistance 10Ω is cut along its length such that its radius becomes half of it's value then what will be the new resistance?

What is the difference between normal reflection and total internal reflection

What is the speed of electricity ?

What is the relation between magnification and focal length of a spherical lens?

Question 29Draw a ray diagram showing the path of rays of light when it enters with oblique incidence (i) from air into water; (ii) from water into air.

A 10 eV electron is circulating in a plane at right angles to a uniform field of magnetic induction 10^-4 Wb/m² (= 1.0 gauss), the orbital radius of electron is

a spherical mirror forms three times magnified real image of AN object placeed in front of it. If the focus is situated at a distance of 9cm from the pole, calculate how far the image is situated. What type of mirror is used

As light rays pass from water into glass, are they refracted towards the normal or away from the normal?

When travelling obliquely from one optical medium to another optical medium, the direction of light rays in the second medium _____________.

three charges are placed on the vertices of the equilateral triangle of side length l. find the sign and magnitude of charge q placed at the centroid so that the system of charges will be in equilibrium

13 A circular coiil carrying a certain current produces a magnetic field Bo at its centre. The coil is now rewoundso as to have 3 turns and the same current is passed through it. The new magnetic field at the centre is

How do we see things around us? How do we see colors? Suppose you are in a room, which has four boxes - black, white, red and blue. If the room is illuminated by red light, what color will the boxes appear?

55.At what hight above the earth surface does the value of g becomes 36%of the value at the surface of earth? (a) 2R/5 (b) 2R/3 (c) 3R/7 (d) R/3

62 A 250ml sample of a 0.20M Cr3+ is electrolyzed with a current of 96.5A.If the remaining (Cr3+)is 0.1M the duration of process is:-

The mutual inductance between a primary and secondary coil is 0.5 H. The resistance of the primary and the secondary coils are 20 Ω and 5 Ω respectively. To generate a current of 0.4 A in the secondary coil, current in the primary must be changed at a rate of-

A body weighs 120 N at a height equal to the radius of the Earth. Its weight on the Earth's surface will be -

A wire of resistance 3ohmand length 10cm is stretched to length 30cm.Assuming uniform cross section,new resistance?

how much energy is gained by an electron accelerated through potential difference of 3 ×10^2 V?

State the laws of reflection and describe an experiment to verify them.

Refractive indices of carbon disulphide and ethyl alcohol are 1.63 and 1.36 respectively. Which is optically denser?

1.what is a purpose of using the transformer? Can it be used with both current sources? 2. How can you determine the direction of magnetic field line by a straight wire?

The wavelength of radiation emitted , when in He+ electron falls from infinity to stationary state would be ________.

17.In the given figure initially the capacitor uncharged ratio of current t-0 and t-infinte will be

When ice melts without any change in temperature at its melting point

The bells of a temple are big in size. Why?

why do same current flows through all resistors in series connection but not in parallel connection??

A square loop of wire, side length 10 cm is placed at angle of 45^° with a magnetic field that changes uniformly from 0.1 T to zero in 0.7 second. The induced current in the loop (its resis†an ce is 1 Ω) is

55. The distance between an object and a screen is 80 cm.If a 3 times magnified image is formed on the screen.Calculate the object distance,Focal length and the image distance.

How does the refractive index of a medium depend on its temperature?

Why does the sky appears blue?

Which component has the biggest size in the transistor?

A current of 2 A exists in a square loop of edge 10 cm. Find the magnetic field B at the centre of the square loop

A conducting ring of radius r is placed perpendicularly inside a time varying magnetic field given by B=B+α t.B and α are positive constants. E.m.f. induced in the ring is

A convex lens of focal length 30 cm is in contact with a concave lens of focal length 40cm the focal length of the combinationa co

An electric heater of resistance 8Ω draws 15 A from the service mains 2 hours. Calculate the rate at which heat is developed in the heater.

TWO MASSES OF 10 KGAND 20 KG ARE CONNECTED BY MASSLESS SPRINGA FORCE OF 200N ACTS ON 20 KG.AT A CERTAIN INSTANTTHE ACCELERATION OF 10 KG MASS IS12 M/S.THE ACCELERATION OF 20 KGMASS AT INSTANT IS

Question 18Arabari forests of Bengal is dominated by(a) Teak(b) Sal(c) Bamboo(d) Mangroove

A particle of mass M is released in vertical plane from a point P at x = x0 on the axis it falls vertically along the y-axis. Find the torque τ acting on the particle at a time t about origin?

What is the purpose of momentum?

lmpor†an t points on semiconducting diode

A dentist's mirror has radius of curvature 3 cm. How far must it be placed from a small dental cavity to give a virtual image of the cavity that is magnified 5 times?