16569 + Interview Questions in Physics

1.	Why the wire with least resistance acts as a short circuit wire??
Answer» Why the wire with least resistance acts as a short circuit wire??

Discussion

2.	What is the carrier frequency in an AM wave when its highest frequency component is 850 Hz and the bandwidth of the signal is 50 Hz?
Answer» What is the carrier frequency in an AM wave when its highest frequency component is 850 Hz and the bandwidth of the signal is 50 Hz?

Discussion

3.	Two identical small bodies of mass m and charge q are suspended from two string each of length l. This whole system is taken in orbiting artificial satellite, then find tension in the strings
Answer» Two identical small bodies of mass m and charge q are suspended from two string each of length l. This whole system is taken in orbiting artificial satellite, then find tension in the strings

Discussion

4.	Several electric bulbs designed to be used on a 220 V electric supply line, are rated 10 W. How many lamps can be connected in parallel with each other across the two wires of 220 V line if the maximum allowable current is 5 A?
Answer» Several electric bulbs designed to be used on a 220 V electric supply line, are rated 10 W. How many lamps can be connected in parallel with each other across the two wires of 220 V line if the maximum allowable current is 5 A?

Discussion

5.	A portable radio has a built-in transformer so that it cna work from the mains instead of batteries. Is this a step-up or step down transformer ?
Answer» A portable radio has a built-in transformer so that it cna work from the mains instead of batteries. Is this a step-up or step down transformer ?

Discussion

6.	A satellite is revolving in a circular orbit at a height h from the earth surface, such that h<<R where R is the radius of the earth. Assuming that the effect of earth's atmosphere can be neglected, the minimum increase in the speed required so that the satellite could escape from the gravitational field of earth is:
Answer» A satellite is revolving in a circular orbit at a height $h$ from the earth surface, such that $h << R$ where $R$ is the radius of the earth. Assuming that the effect of earth's atmosphere can be neglected, the minimum increase in the speed required so that the satellite could escape from the gravitational field of earth is:

Discussion

7.	A particle is projected with velocity 10 m/s at an angle of 60 degree from ground. Then the vertical component of velocity vector when instantaneous velocity becomes perpendicular to initial velocity, is
Answer» A particle is projected with velocity 10 m/s at an angle of 60 degree from ground. Then the vertical component of velocity vector when instantaneous velocity becomes perpendicular to initial velocity, is

Discussion

8.	Four students performed experiments on series and parallel combination of two given resistors R1 and R2 which obey Ohm's law and plotted the following V-I graphs:Which of the graph is correctly labeled in terms of 'series' and 'parallel'?(1) graph A(2) graph B(3) graph C(4) graph D
Answer» Four students performed experiments on series and parallel combination of two given resistors R₁ and R₂ which obey Ohm's law and plotted the following V $-$ I graphs: Which of the graph is correctly labeled in terms of 'series' and 'parallel'? (1) graph A (2) graph B (3) graph C (4) graph D

Discussion

9.	One end of a cylindrical glass rod ends in a hemispherical convex surface of radius R=20 mm. Find the image distance of a point object on the axis of the rod, placed 80 mm outside its vertex. The rod is in the air and the refractive index of glass is 1.5.
Answer» One end of a cylindrical glass rod ends in a hemispherical convex surface of radius $R = 20 m m$ . Find the image distance of a point object on the axis of the rod, placed $80 m m$ outside its vertex. The rod is in the air and the refractive index of glass is $1.5$ .

Discussion

10.	A ray of light passing through a certain point of a lens does not undergo any deviation. What point is this?
Answer» A ray of light passing through a certain point of a lens does not undergo any deviation. What point is this?

Discussion

11.	What is the rainbow? How is rainbow formed?
Answer» What is the rainbow? How is rainbow formed?

Discussion

12.	Will the isotopes of chlorine be placed in the same group? Give reason.
Answer» Will the isotopes of chlorine be placed in the same group? Give reason.

Discussion

13.	Why copper and aluminum are used over tungsten, iron, nickel to make fuses?
Answer» Why copper and aluminum are used over tungsten, iron, nickel to make fuses?

Discussion

14.	In the given LCR series circuit, the reading (in A) of the hot wire ammeter (assume all meters are ideal) is
Answer» In the given $LCR$ series circuit, the reading $(in A)$ of the hot wire ammeter (assume all meters are ideal) is

Discussion

15.	Consider an object falling from a terrace of height 20m above ground level. At what point does it posses maximum kinetic energy?
Answer» Consider an object falling from a terrace of height 20m above ground level. At what point does it posses maximum kinetic energy?

Discussion

16.	What is the structure of borax
Answer» What is the structure of borax

Discussion

17.	91.Find the magnetic field of induction at an axial and equatorial point of a circular coil
Answer» 91.Find the magnetic field of induction at an axial and equatorial point of a circular coil

Discussion

18.	Question 17An 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» Question 17 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

19.	The same current flows through the electric line wires and the filament of bulb yet only filament and glows, why?
Answer» The same current flows through the electric line wires and the filament of bulb yet only filament and glows, why?

Discussion

20.	62. The speed of light in water is 2.25 into 10 ki power 8 metre per second refractive index of water is 4 by 3 then find the speed of light in vacuum
Answer» 62. The speed of light in water is 2.25 into 10 ki power 8 metre per second refractive index of water is 4 by 3 then find the speed of light in vacuum

Discussion

21.	Two lenses are in contact and focal length of the the combination is 80cm. if the focal length of one lens is 20cm, then what would be power of the other lens ?
Answer» Two lenses are in contact and focal length of the the combination is 80cm. if the focal length of one lens is 20cm, then what would be power of the other lens ?

Discussion

22.	A student can distinctly see the object up to a distance 15 cm. He wants to see the black board at a distance of 3 m. Focal length and power of lens used respectively will be-
Answer» A student can distinctly see the object up to a distance $15 cm .$ He wants to see the black board at a distance of $3 m .$ Focal length and power of lens used respectively will be-

Discussion

23.	Three lenses in contact have a combined focal length of 12 cm when third lens is removed the combined focal length is 60/7cm.the third lens is
Answer» Three lenses in contact have a combined focal length of 12 cm when third lens is removed the combined focal length is 60/7cm.the third lens is

Discussion

24.	A long wire carries a steady current , it is bent into a circle of one turn and magnetic field at center of coil is B. It is then bent into a circular loop of n turns. The magnetic field at center of coil will be?
Answer» A long wire carries a steady current , it is bent into a circle of one turn and magnetic field at center of coil is B. It is then bent into a circular loop of n turns. The magnetic field at center of coil will be?

Discussion

25.	What will happen if in the galileoGa experiment r.h.s was not provided same height as l.h.s??say theta =30°.And what will happen if angle was equally reduced in both sides?lhs and rhs? Unlike galileGal experiment where only angle of RHS was reduced
Answer» What will happen if in the galileoGa experiment r.h.s was not provided same height as l.h.s??say theta =30°. And what will happen if angle was equally reduced in both sides?lhs and rhs? Unlike galileGal experiment where only angle of RHS was reduced

Discussion

26.	Find the equivalent resistance across A & B in the given circuit.
Answer» Find the equivalent resistance across A & B in the given circuit.

26.

Find the equivalent resistance across A & B in the given circuit.

Answer»

Find the equivalent resistance across A & B in the given circuit.

Discussion

27.	A ball is thrown upwards with an initial velocity of 20 ms−1. Find the time of flight and the maximum height reached by the body respectively. (g=10 ms−2)
Answer» A ball is thrown upwards with an initial velocity of $20 m s^{- 1}$ . Find the time of flight and the maximum height reached by the body respectively. ( $g = 10 m s^{- 2}$ )

Discussion

28.	The current i in a coil varies with time, as shown in the figure. The variation of induced emf with time would be:
Answer» The current $i$ in a coil varies with time, as shown in the figure. The variation of induced emf with time would be:

Discussion

29.	down streaming process?
Answer» down streaming process?

Discussion

30.	Why do we need extra energy on the mountains?
Answer» Why do we need extra energy on the mountains?

Discussion

31.	In fig shows a lemon crusher. (a) In the diagram, mark the position of the fulcrum F and the line of action of load L and effort E. (b) Name the class of lever.
Answer» In fig shows a lemon crusher. (a) In the diagram, mark the position of the fulcrum F and the line of action of load L and effort E. (b) Name the class of lever.

31.

In fig shows a lemon crusher. (a) In the diagram, mark the position of the fulcrum F and the line of action of load L and effort E. (b) Name the class of lever.

Answer»

In fig shows a lemon crusher.

(a) In the diagram, mark the position of the fulcrum F and the line of action of load L and effort E.

(b) Name the class of lever.

Discussion

32.	A weightless rod length l carries two equal mass m .one in the middle and other at the end c of the rod .horizontal velocity so that the rod just becomes horizontal is
Answer» A weightless rod length l carries two equal mass m .one in the middle and other at the end c of the rod .horizontal velocity so that the rod just becomes horizontal is

Discussion

33.	If two resistors of resistances (4+-0.5)ohm and (16+-0.5)ohm are connected in parallel find the equivalent resistance and error percentage.
Answer» If two resistors of resistances (4+-0.5)ohm and (16+-0.5)ohm are connected in parallel find the equivalent resistance and error percentage.

Discussion

34.	why do lone pair of electrons have dipole moment
Answer» why do lone pair of electrons have dipole moment

Discussion

35.	For a light ray passing from air to water, according to Snell's law:(n represents refractive index of the medium, θair is the angle of incidence and θwater is the angle of refraction)
Answer» For a light ray passing from air to water, according to Snell's law: ( $n$ represents refractive index of the medium, $θ_{a i r}$ is the angle of incidence and $θ_{w a t e r}$ is the angle of refraction)

Discussion

36.	A block of weight W is supported by three strings as shown in figure. Which of the following relations is true for tension in the strings? (Here T1, T2 and T3 are the tension in the strings A, B and C respectively
Answer» A block of weight W is supported by three strings as shown in figure. Which of the following relations is true for tension in the strings? (Here T1, T2 and T3 are the tension in the strings A, B and C respectively

Discussion

37.	10.How to find the direction of electric field when a charge of +q and -q are stationary in air?
Answer» 10.How to find the direction of electric field when a charge of +q and -q are stationary in air?

Discussion

38.	Two spherical bodies A (radius 6 cm) and B (radius 18 cm) are at temperatures T1 and T2, respectively. The maximum intensity in the emission spectrum of A is at 500 nm and in that of B is at 1500 nm. Considering them to be black bodies, what will be the ratio of the rate of total energy radiated by A to that of B?
Answer» Two spherical bodies $A$ (radius $6 c m)$ and $B$ (radius $18 c m)$ are at temperatures $T_{1}$ and $T_{2}$ , respectively. The maximum intensity in the emission spectrum of $A$ is at $500 n m$ and in that of $B$ is at $1500 n m$ . Considering them to be black bodies, what will be the ratio of the rate of total energy radiated by $A$ to that of $B$ ?

Discussion

39.	Write any four processes involved in the completion of the water cycle.
Answer» Write any four processes involved in the completion of the water cycle.

Discussion

40.	Question 28 (iii) B1, B2, and B3 are three identical bulbs connected as shown in Figure. When all the three bulbs glow, a current of 3A is recorded by the ammeter A. (iii) How much power is dissipated in the circuit when all the three bulbs glow together?
Answer» Question 28 (iii) $B_{1}, B_{2}, a n d B_{3}$ are three identical bulbs connected as shown in Figure. When all the three bulbs glow, a current of 3A is recorded by the ammeter A. (iii) How much power is dissipated in the circuit when all the three bulbs glow together?

Discussion

41.	Does resistance depend on current explain
Answer» Does resistance depend on current explain

Discussion

42.	54.Among real gas & ideal gas , which gas has higher volume under constant amount of mole ?
Answer» 54.Among real gas & ideal gas , which gas has higher volume under constant amount of mole ?

Discussion

43.	A boy have a mass of 50 kg. What would be his weight on the Earth? (g=10ms−2)
Answer» A boy have a mass of 50 kg. What would be his weight on the Earth? $(g = 10 {m s}^{- 2})$

43.

A boy have a mass of 50 kg. What would be his weight on the Earth? (g=10ms−2)

Answer»

A boy have a mass of 50 kg. What would be his weight on the Earth? $(g = 10 {m s}^{- 2})$

Discussion

44.	a convex lens immersed in water of refractive index 4/3 has a focal length of 40 cm and the same lens when immersed in a liquid of refractive index 2 has a focal length of -20 cm. the refractive index of the material of the lens is.
Answer» a convex lens immersed in water of refractive index 4/3 has a focal length of 40 cm and the same lens when immersed in a liquid of refractive index 2 has a focal length of -20 cm. the refractive index of the material of the lens is.

Discussion

45.	The near-point of a hypermetropic eye is 75 cm from the eye. What is the power of the lens required to enable the person to read a book held at 25 cm from the eye?
Answer» The near-point of a hypermetropic eye is $75 cm$ from the eye. What is the power of the lens required to enable the person to read a book held at $25 cm$ from the eye?

Discussion

46.	A piece of iron of mass 2.0 kg has a thermal capacity of 966 J °C-1 . Heat needed to warm it by 15°C is
Answer» A piece of iron of mass 2.0 kg has a thermal capacity of 966 J °C^-1. Heat needed to warm it by 15°C is

Discussion

47.	Light with an energy flux of 25×104 W-m−2 falls on a perfectly reflecting surface at normal incidence. If the surface area is 15 cm2, the average force exerted on the surface is -
Answer» Light with an energy flux of $25 \times 10^{4} {W-m}^{- 2}$ falls on a perfectly reflecting surface at normal incidence. If the surface area is $15 {cm}^{2}$ , the average force exerted on the surface is -

Discussion

48.	Calculate the power loss in an electric transmission cable15 km long, carrying a current of 100A at a potential of 200 kV. The resistance per km of the cable is 0.2 ohms
Answer» Calculate the power loss in an electric transmission cable15 km long, carrying a current of 100A at a potential of 200 kV. The resistance per km of the cable is 0.2 ohms

Discussion

49.	The magnetic field strength at 1,2, and 3 in the following picture is in the order:
Answer» The magnetic field strength at $1, 2,$ and $3$ in the following picture is in the order:

49.

The magnetic field strength at 1,2, and 3 in the following picture is in the order:

Answer»

The magnetic field strength at $1, 2,$ and $3$ in the following picture is in the order:

Discussion

50.	What is joules law of heating
Answer» What is joules law of heating

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Why the wire with least resistance acts as a short circuit wire??

What is the carrier frequency in an AM wave when its highest frequency component is 850 Hz and the bandwidth of the signal is 50 Hz?

Two identical small bodies of mass m and charge q are suspended from two string each of length l. This whole system is taken in orbiting artificial satellite, then find tension in the strings

Several electric bulbs designed to be used on a 220 V electric supply line, are rated 10 W. How many lamps can be connected in parallel with each other across the two wires of 220 V line if the maximum allowable current is 5 A?

A portable radio has a built-in transformer so that it cna work from the mains instead of batteries. Is this a step-up or step down transformer ?

A particle is projected with velocity 10 m/s at an angle of 60 degree from ground. Then the vertical component of velocity vector when instantaneous velocity becomes perpendicular to initial velocity, is

Four students performed experiments on series and parallel combination of two given resistors R1 and R2 which obey Ohm's law and plotted the following V-I graphs:Which of the graph is correctly labeled in terms of 'series' and 'parallel'?(1) graph A(2) graph B(3) graph C(4) graph D

One end of a cylindrical glass rod ends in a hemispherical convex surface of radius R=20 mm. Find the image distance of a point object on the axis of the rod, placed 80 mm outside its vertex. The rod is in the air and the refractive index of glass is 1.5.

A ray of light passing through a certain point of a lens does not undergo any deviation. What point is this?

What is the rainbow? How is rainbow formed?

Will the isotopes of chlorine be placed in the same group? Give reason.

Why copper and aluminum are used over tungsten, iron, nickel to make fuses?

In the given LCR series circuit, the reading (in A) of the hot wire ammeter (assume all meters are ideal) is

Consider an object falling from a terrace of height 20m above ground level. At what point does it posses maximum kinetic energy?

What is the structure of borax

91.Find the magnetic field of induction at an axial and equatorial point of a circular coil

Question 17An 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.

The same current flows through the electric line wires and the filament of bulb yet only filament and glows, why?

62. The speed of light in water is 2.25 into 10 ki power 8 metre per second refractive index of water is 4 by 3 then find the speed of light in vacuum

Two lenses are in contact and focal length of the the combination is 80cm. if the focal length of one lens is 20cm, then what would be power of the other lens ?

A student can distinctly see the object up to a distance 15 cm. He wants to see the black board at a distance of 3 m. Focal length and power of lens used respectively will be-

Three lenses in contact have a combined focal length of 12 cm when third lens is removed the combined focal length is 60/7cm.the third lens is

A long wire carries a steady current , it is bent into a circle of one turn and magnetic field at center of coil is B. It is then bent into a circular loop of n turns. The magnetic field at center of coil will be?

What will happen if in the galileoGa experiment r.h.s was not provided same height as l.h.s??say theta =30°.And what will happen if angle was equally reduced in both sides?lhs and rhs? Unlike galileGal experiment where only angle of RHS was reduced

Find the equivalent resistance across A &amp; B in the given circuit.

A ball is thrown upwards with an initial velocity of 20 ms−1. Find the time of flight and the maximum height reached by the body respectively. (g=10 ms−2)

The current i in a coil varies with time, as shown in the figure. The variation of induced emf with time would be:

down streaming process?

Why do we need extra energy on the mountains?

In fig shows a lemon crusher. (a) In the diagram, mark the position of the fulcrum F and the line of action of load L and effort E. (b) Name the class of lever.

A weightless rod length l carries two equal mass m .one in the middle and other at the end c of the rod .horizontal velocity so that the rod just becomes horizontal is

If two resistors of resistances (4+-0.5)ohm and (16+-0.5)ohm are connected in parallel find the equivalent resistance and error percentage.

why do lone pair of electrons have dipole moment

For a light ray passing from air to water, according to Snell's law:(n represents refractive index of the medium, θair is the angle of incidence and θwater is the angle of refraction)

A block of weight W is supported by three strings as shown in figure. Which of the following relations is true for tension in the strings? (Here T1, T2 and T3 are the tension in the strings A, B and C respectively

10.How to find the direction of electric field when a charge of +q and -q are stationary in air?

Write any four processes involved in the completion of the water cycle.

Question 28 (iii) B1, B2, and B3 are three identical bulbs connected as shown in Figure. When all the three bulbs glow, a current of 3A is recorded by the ammeter A. (iii) How much power is dissipated in the circuit when all the three bulbs glow together?

Does resistance depend on current explain

54.Among real gas & ideal gas , which gas has higher volume under constant amount of mole ?

A boy have a mass of 50 kg. What would be his weight on the Earth? (g=10ms−2)

a convex lens immersed in water of refractive index 4/3 has a focal length of 40 cm and the same lens when immersed in a liquid of refractive index 2 has a focal length of -20 cm. the refractive index of the material of the lens is.

The near-point of a hypermetropic eye is 75 cm from the eye. What is the power of the lens required to enable the person to read a book held at 25 cm from the eye?

A piece of iron of mass 2.0 kg has a thermal capacity of 966 J °C-1 . Heat needed to warm it by 15°C is

Light with an energy flux of 25×104 W-m−2 falls on a perfectly reflecting surface at normal incidence. If the surface area is 15 cm2, the average force exerted on the surface is -

Calculate the power loss in an electric transmission cable15 km long, carrying a current of 100A at a potential of 200 kV. The resistance per km of the cable is 0.2 ohms

The magnetic field strength at 1,2, and 3 in the following picture is in the order:

What is joules law of heating

Find the equivalent resistance across A & B in the given circuit.