16569 + Interview Questions in Physics

1.	What happens if you place a compass near a current conducting wire?
Answer» What happens if you place a compass near a current conducting wire?

Discussion

2.	What is the position of image when an object is placed at a distance of 10 cm from a convex lens of focal length 10 cm ?
Answer» What is the position of image when an object is placed at a distance of 10 cm from a convex lens of focal length 10 cm ?

Discussion

3.	what is the net deviation in a sphere when an insident ray of angl 60 falls on it?
Answer» what is the net deviation in a sphere when an insident ray of angl 60 falls on it?

Discussion

4.	A compound microscope has an objective of focal length 2 cm and an eye piece of focal length 5cm an object is placed at an distance 2.4cm in front of objective lens if final image forms at infinity then magnifying power and corresponding tube length of microscope are respectively
Answer» A compound microscope has an objective of focal length 2 cm and an eye piece of focal length 5cm an object is placed at an distance 2.4cm in front of objective lens if final image forms at infinity then magnifying power and corresponding tube length of microscope are respectively

Discussion

5.	Why does the sun appear to be yellow even if the light emitted by it is white, even when there is no material like this glass prism between the light ray and our eyes ?
Answer» Why does the sun appear to be yellow even if the light emitted by it is white, even when there is no material like this glass prism between the light ray and our eyes ?

Discussion

6.	Q3. Consider the following statements: 1. The Wildlife Protection Act, 1972 is an Act of the Parliament of India enacted for protection of plants and animal species. 2. Schedule I and part II of Schedule II provide absolute protection – offences under these are prescribed the highest penalties. Which of the above statements are correct?
Answer» Q3. Consider the following statements: 1. The Wildlife Protection Act, 1972 is an Act of the Parliament of India enacted for protection of plants and animal species. 2. Schedule I and part II of Schedule II provide absolute protection – offences under these are prescribed the highest penalties. Which of the above statements are correct?

6.

Q3. Consider the following statements: 1. The Wildlife Protection Act, 1972 is an Act of the Parliament of India enacted for protection of plants and animal species. 2. Schedule I and part II of Schedule II provide absolute protection – offences under these are prescribed the highest penalties. Which of the above statements are correct?

Answer»

Q3. Consider the following statements:

1. The Wildlife Protection Act, 1972 is an Act of the Parliament of India enacted for protection of plants and animal species.

2. Schedule I and part II of Schedule II provide absolute protection – offences under these are prescribed the highest penalties.

Which of the above statements are correct?

Discussion

7.	Question 7A person has a hearing range from 20 Hz to 20 kHz. What are the typical wavelengths of sound waves in air corresponding to these two frequencies? Take the speed of sound in air as 344ms−1.
Answer» Question 7 A person has a hearing range from 20 Hz to 20 kHz. What are the typical wavelengths of sound waves in air corresponding to these two frequencies? Take the speed of sound in air as $344 m s^{- 1}$ .

Discussion

8.	in a collection of H atoms all the electrons jump from n=5 to ground level directly or indirectly without emitting any line in balmer series. the number of possilble different radiation is ?
Answer» in a collection of H atoms all the electrons jump from n=5 to ground level directly or indirectly without emitting any line in balmer series. the number of possilble different radiation is ?

Discussion

9.	Which of the two is more energy efficient : filament type electric bulb or CFL ? Why ?
Answer» Which of the two is more energy efficient : filament type electric bulb or CFL ? Why ?

Discussion

10.	Name the fundamental force of nature which holds the planets in their orbits around the Sun.
Answer» Name the fundamental force of nature which holds the planets in their orbits around the Sun.

Discussion

11.	118.If the plane mirror is rotated through an angle of 5 degrees keeping ths direction of incident ray as it is, what is the angle through which the reflected ray turns?
Answer» 118.If the plane mirror is rotated through an angle of 5 degrees keeping ths direction of incident ray as it is, what is the angle through which the reflected ray turns?

Discussion

12.	Can Mass be converted into energy ?
Answer» Can Mass be converted into energy ?

Discussion

13.	The principle on which a DC Motor and an AC Generator works respectively are:
Answer» The principle on which a DC Motor and an AC Generator works respectively are:

Discussion

14.	A daniel cell is balanced on 125 cm length of a potentiometer wire. When the cell is shortcircuited with a 2 ohm resistance, the balancing length obtained is 100 cm.Internal resistance of the cell will be a) 1.5 ohm b) 0.5 ohm c) 1.25 ohm d) 4/5 ohm
Answer» A daniel cell is balanced on 125 cm length of a potentiometer wire. When the cell is shortcircuited with a 2 ohm resistance, the balancing length obtained is 100 cm.Internal resistance of the cell will be a) 1.5 ohm b) 0.5 ohm c) 1.25 ohm d) 4/5 ohm

Discussion

15.	Brief description of working of pupil and Retina?
Answer» Brief description of working of pupil and Retina?

Discussion

16.	If A’ is the image of A then the light ray going from B and hitting the mirror at C will intersect the principal axis at which point?
Answer» If A’ is the image of A then the light ray going from B and hitting the mirror at C will intersect the principal axis at which point?

Discussion

17.	A ray of light travels from an optically denser to a rarer medium. The critical angle for the media is C. The maximum possible deviation p of the ray will b
Answer» A ray of light travels from an optically denser to a rarer medium. The critical angle for the media is C. The maximum possible deviation p of the ray will b

Discussion

18.	What are the S.I. and C.G.S units of work? How are they related ? Establish the relationship.
Answer» What are the S.I. and C.G.S units of work? How are they related ? Establish the relationship.

Discussion

19.	Find total heat loss in the circuit after the switch (S) is closed.स्विच (S) को बन्द करने के बाद परिपथ में कुल ऊष्मा हानि ज्ञात कीजिए।
Answer» Find total heat loss in the circuit after the switch (S) is closed. स्विच (S) को बन्द करने के बाद परिपथ में कुल ऊष्मा हानि ज्ञात कीजिए।

Discussion

20.	What is a magnifying glass ? State its two uses.
Answer» What is a magnifying glass ? State its two uses.

Discussion

21.	a particle of mass 2m moving with velocity v strikes a stationary particle of mass 3m and sticks to it. the speed of the system is
Answer» a particle of mass 2m moving with velocity v strikes a stationary particle of mass 3m and sticks to it. the speed of the system is

Discussion

22.	How to calculate equivalent resistance in case of infinite resistors?
Answer» How to calculate equivalent resistance in case of infinite resistors?

Discussion

23.	In an experiment on tracing the path of a ray of light through a rectangular glass slab, four students A, B, C and D used the following values of the angle of incidence and the distance between the feet of the two pins (fixed on the incident rays):(A) 30°, 45°, 60° and 1 cm(B) 30°, 45°, 60° and 6 cm(C) 20°, 50°, 80° and 10 cm(D) 20°, 50°, 80° and 15 cmOut of these, the best choice is that of the student:(1) A(2) B(3) C(4) D
Answer» In an experiment on tracing the path of a ray of light through a rectangular glass slab, four students A, B, C and D used the following values of the angle of incidence and the distance between the feet of the two pins (fixed on the incident rays): (A) 30°, 45°, 60° and 1 cm (B) 30°, 45°, 60° and 6 cm (C) 20°, 50°, 80° and 10 cm (D) 20°, 50°, 80° and 15 cm Out of these, the best choice is that of the student: (1) A (2) B (3) C (4) D

Discussion

24.	ntA conducting square metal frame of side L (< r) is placed inside solenoid such that its plane is perpendicular to the axis of solenoid. The solenoid have n turns per unit length. If a current I = Iosinwt flows through the solenoid, then find the magnitude of emf induced in frame.n
Answer» ntA conducting square metal frame of side L (< r) is placed inside solenoid such that its plane is perpendicular to the axis of solenoid. The solenoid have n turns per unit length. If a current I = Iosinwt flows through the solenoid, then find the magnitude of emf induced in frame.n

Discussion

25.	We know that electromagnetic waves are transverse in nature What what is the meaning of this word"Transverse"?
Answer» We know that electromagnetic waves are transverse in nature What what is the meaning of this word"Transverse"?

Discussion

26.	The first row of flexibility matrix for the co-ordinate system as shown in figure is :
Answer» The first row of flexibility matrix for the co-ordinate system as shown in figure is :

Discussion

27.	The magnetic field strength at a point due to a current carrying circular wire depends on
Answer» The magnetic field strength at a point due to a current carrying circular wire depends on

Discussion

28.	{ Two coils }A and }B have mutual inductance }2×10^{-2} henry. }}{ If the current in the primary is }i=5\operatorname{sin}(10π t) then the }}{ maximum value of e.m.f. induced in coil }B is
Answer» { Two coils }A and }B have mutual inductance }2×10^{-2} henry. }}{ If the current in the primary is }i=5\operatorname{sin}(10π t) then the }}{ maximum value of e.m.f. induced in coil }B is

Discussion

29.	A box follows a zigzag path to reach from point A to B. The actual length of the path is 5 m and the length of the straight line joining the two points is 2 m. If a force of 5 N acts on the box along its path then the work done on the box by the force is:
Answer» A box follows a zigzag path to reach from point A to B. The actual length of the path is 5 m and the length of the straight line joining the two points is 2 m. If a force of 5 N acts on the box along its path then the work done on the box by the force is:

Discussion

30.	A 3-phase alternator has synchronous reactance, Xd=1.7241p.u. and is connected to a very large system. The terminal voltage is 1.0∠0∘p.u. and the generator is supplying to the system a current of 0.8 p.u. at 0.9 power factor lagging. If the real power output of the generator remains constant but the excitation of the generator is increased by 20%, then the Q delivered to the bus by the generator is ____p.u. (Answer upto three decimals).0.632
Answer» A 3-phase alternator has synchronous reactance, $X_{d} = 1.7241 p . u .$ and is connected to a very large system. The terminal voltage is $1.0 ∠ 0^{\circ} p . u .$ and the generator is supplying to the system a current of 0.8 p.u. at 0.9 power factor lagging. If the real power output of the generator remains constant but the excitation of the generator is increased by 20%, then the Q delivered to the bus by the generator is ____p.u. (Answer upto three decimals). 0.632

Discussion

31.	1.What is the electric field vs radius graph in a ring?
Answer» 1.What is the electric field vs radius graph in a ring?

Discussion

32.	In H atom, x is the first Bohr orbit, de Broglie wavelength of 3rd orbit is -?
Answer» In H atom, x is the first Bohr orbit, de Broglie wavelength of 3rd orbit is -?

Discussion

33.	The given figure shows three resistors of 2Ω, 4Ω and RΩ connected to a battery of EMF 2V and internal resistance 3Ω.A main current of 0.25 A flows through the circuit. (a) What is the potential difference across the 4Ω resistor? (b) Calculate the potential difference across the internal resistance of the cell. (c) What is the potential difference across the RΩ or 2Ω resistors? (d) Calculate the value of R. [5 MARKS]
Answer» The given figure shows three resistors of $2 Ω$ , $4 Ω$ and $R Ω$ connected to a battery of EMF 2V and internal resistance $3 Ω$ .A main current of 0.25 A flows through the circuit. (a) What is the potential difference across the $4 Ω$ resistor? (b) Calculate the potential difference across the internal resistance of the cell. (c) What is the potential difference across the $R Ω$ or $2 Ω$ resistors? (d) Calculate the value of R. [5 MARKS]

Discussion

34.	What do you mean by the refractive index of a medium?
Answer» What do you mean by the refractive index of a medium?

Discussion

35.	(i)Electrical resistivity(a)Potential difference is same(ii)Parallel combination(b)Depends on length and cross sectional area(iii)Resistance(c)Produces constant EMF(iv)Battery(d)Depends upon material
Answer» $\begin{matrix} (i) Electrical resistivity & (a) Potential difference is same (i i) Parallel combination & (b) Depends on length and cross sectional area (i i i) Resistance & (c) Produces constant EMF (i v) Battery & (d) Depends upon material \end{matrix}$

Discussion

36.	How does the (a) average kinetic energy (b) average potential energy of molecules of a substance change during its change in phase at a constant temperature, on heating ?
Answer» How does the (a) average kinetic energy (b) average potential energy of molecules of a substance change during its change in phase at a constant temperature, on heating ?

36.

How does the (a) average kinetic energy (b) average potential energy of molecules of a substance change during its change in phase at a constant temperature, on heating ?

Answer»

How does the (a) average kinetic energy (b) average potential energy of molecules of a substance change during its change in phase at a constant temperature, on heating ?

Discussion

37.	A bat flies perpendicularly towards a wall with a speed of 6 m/s, emitting sound of frequency 450 kHz. What is the frequency of the wave reflected from the wall that it will hear? Given, c=340 m/s.
Answer» A bat flies perpendicularly towards a wall with a speed of 6 m/s, emitting sound of frequency 450 kHz. What is the frequency of the wave reflected from the wall that it will hear? Given, c=340 m/s.

Discussion

38.	An electrical applance has a rating 100 W, 120V. The resistance of element of appliance when in use is: (a) 1.2Ω (b) 144Ω (c) 120Ω (d) 100Ω
Answer» An electrical applance has a rating 100 W, 120V. The resistance of element of appliance when in use is: (a) $1.2 Ω$ (b) $144 Ω$ (c) $120 Ω$ (d) $100 Ω$

38.

An electrical applance has a rating 100 W, 120V. The resistance of element of appliance when in use is: (a) 1.2Ω (b) 144Ω (c) 120Ω (d) 100Ω

Answer»

An electrical applance has a rating 100 W, 120V. The resistance of element of appliance when in use is:

(a) $1.2 Ω$ (b) $144 Ω$ (c) $120 Ω$ (d) $100 Ω$

Discussion

39.	For what time period should a flow of 1019 electrons be maintained between two points A and B to have a constant current of 8 A between them?
Answer» For what time period should a flow of $10^{19}$ electrons be maintained between two points A and B to have a constant current of $8 A$ between them?

Discussion

40.	A source of constant voltage V is connected to a resistance R and two ideal inductors L1 and L2 through a switch S as shown. There is no mutual inductance between the two inductors. The switch S is initially open. At t=0, the switch is closed and current begins to flow. Which of the following options is/are correct?
Answer» A source of constant voltage $V$ is connected to a resistance $R$ and two ideal inductors $L_{1}$ and $L_{2}$ through a switch $S$ as shown. There is no mutual inductance between the two inductors. The switch $S$ is initially open. At $t = 0$ , the switch is closed and current begins to flow. Which of the following options is/are correct?

Discussion

41.	what is LC oscillation and and parallel RCL circuit?
Answer» what is LC oscillation and and parallel RCL circuit?

Discussion

42.	What are R and S configurations ?
Answer» What are R and S configurations ?

Discussion

43.	Effective length of magnet is 31.4 cm and its pole strength is 0.5 A-m. Magnetic moment if it is bent in the form of a semicircle will be (in A-m2)
Answer» Effective length of magnet is 31.4 cm and its pole strength is 0.5 A-m. Magnetic moment if it is bent in the form of a semicircle will be (in A-m2)

Discussion

44.	37.At a place horizontal and vertical components of the Earth's magnetic field are as follows: B(h) =1 G 10 degrees west of North B(v) =1 G vertically downwards Then angle of dip and declination are respectively?
Answer» 37.At a place horizontal and vertical components of the Earth's magnetic field are as follows: B(h) =1 G 10 degrees west of North B(v) =1 G vertically downwards Then angle of dip and declination are respectively?

Discussion

45.	The equivalent focal length of the given system is:(Refractive index for the lenses are given in the diagram)
Answer» The equivalent focal length of the given system is: (Refractive index for the lenses are given in the diagram)

Discussion

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

Discussion

47.	Two plane mirrors are initially inclined at 30° and they move apart with an addition of 30° till the angle become 120°. Find the sum of the number of images formed in each case. (Mirrors are inclined symmetrically)
Answer» Two plane mirrors are initially inclined at 30° and they move apart with an addition of 30° till the angle become 120°. Find the sum of the number of images formed in each case. (Mirrors are inclined symmetrically)

Discussion

48.	Pressure P1 is applied on a sphere of radius 5 cm. Keeping the thrust constant, if the radius of the sphere is decreased to 2.5 cm, the new pressure is found out to be P2. Find P2:P1.4
Answer» Pressure $P_{1}$ is applied on a sphere of radius $5 cm$ . Keeping the thrust constant, if the radius of the sphere is decreased to $2.5 cm$ , the new pressure is found out to be $P_{2}$ . Find $P_{2} : P_{1}$ . 4

Discussion

49.	Why the conduction of electrolytic solution decreases with increase in concentration?
Answer» Why the conduction of electrolytic solution decreases with increase in concentration?

Discussion

50.	147. A current carrying circular loop lies on a smooth horizontal plane. Can a uniform magnetic field be set up in such a manner that the loop turns around itself (i.e. , turns about the vertical axis).
Answer» 147. A current carrying circular loop lies on a smooth horizontal plane. Can a uniform magnetic field be set up in such a manner that the loop turns around itself (i.e. , turns about the vertical axis).

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

What happens if you place a compass near a current conducting wire?

What is the position of image when an object is placed at a distance of 10 cm from a convex lens of focal length 10 cm ?

what is the net deviation in a sphere when an insident ray of angl 60 falls on it?

A compound microscope has an objective of focal length 2 cm and an eye piece of focal length 5cm an object is placed at an distance 2.4cm in front of objective lens if final image forms at infinity then magnifying power and corresponding tube length of microscope are respectively

Why does the sun appear to be yellow even if the light emitted by it is white, even when there is no material like this glass prism between the light ray and our eyes ?

Question 7A person has a hearing range from 20 Hz to 20 kHz. What are the typical wavelengths of sound waves in air corresponding to these two frequencies? Take the speed of sound in air as 344ms−1.

in a collection of H atoms all the electrons jump from n=5 to ground level directly or indirectly without emitting any line in balmer series. the number of possilble different radiation is ?

Which of the two is more energy efficient : filament type electric bulb or CFL ? Why ?

Name the fundamental force of nature which holds the planets in their orbits around the Sun.

118.If the plane mirror is rotated through an angle of 5 degrees keeping ths direction of incident ray as it is, what is the angle through which the reflected ray turns?

Can Mass be converted into energy ?

The principle on which a DC Motor and an AC Generator works respectively are:

A daniel cell is balanced on 125 cm length of a potentiometer wire. When the cell is shortcircuited with a 2 ohm resistance, the balancing length obtained is 100 cm.Internal resistance of the cell will be a) 1.5 ohm b) 0.5 ohm c) 1.25 ohm d) 4/5 ohm

Brief description of working of pupil and Retina?

If A’ is the image of A then the light ray going from B and hitting the mirror at C will intersect the principal axis at which point?​​​​​​​

A ray of light travels from an optically denser to a rarer medium. The critical angle for the media is C. The maximum possible deviation p of the ray will b

What are the S.I. and C.G.S units of work? How are they related ? Establish the relationship.

Find total heat loss in the circuit after the switch (S) is closed.स्विच (S) को बन्द करने के बाद परिपथ में कुल ऊष्मा हानि ज्ञात कीजिए।

What is a magnifying glass ? State its two uses.

a particle of mass 2m moving with velocity v strikes a stationary particle of mass 3m and sticks to it. the speed of the system is

How to calculate equivalent resistance in case of infinite resistors?

ntA conducting square metal frame of side L (< r) is placed inside solenoid such that its plane is perpendicular to the axis of solenoid. The solenoid have n turns per unit length. If a current I = Iosinwt flows through the solenoid, then find the magnitude of emf induced in frame.n

We know that electromagnetic waves are transverse in nature What what is the meaning of this word"Transverse"?

The first row of flexibility matrix for the co-ordinate system as shown in figure is :

The magnetic field strength at a point due to a current carrying circular wire depends on

{ Two coils }A and }B have mutual inductance }2×10^{-2} henry. }}{ If the current in the primary is }i=5\operatorname{sin}(10π t) then the }}{ maximum value of e.m.f. induced in coil }B is

A box follows a zigzag path to reach from point A to B. The actual length of the path is 5 m and the length of the straight line joining the two points is 2 m. If a force of 5 N acts on the box along its path then the work done on the box by the force is:

1.What is the electric field vs radius graph in a ring?

In H atom, x is the first Bohr orbit, de Broglie wavelength of 3rd orbit is -?

What do you mean by the refractive index of a medium?

(i)Electrical resistivity(a)Potential difference is same(ii)Parallel combination(b)Depends on length and cross sectional area(iii)Resistance(c)Produces constant EMF(iv)Battery(d)Depends upon material

How does the (a) average kinetic energy (b) average potential energy of molecules of a substance change during its change in phase at a constant temperature, on heating ?

A bat flies perpendicularly towards a wall with a speed of 6 m/s, emitting sound of frequency 450 kHz. What is the frequency of the wave reflected from the wall that it will hear? Given, c=340 m/s.

An electrical applance has a rating 100 W, 120V. The resistance of element of appliance when in use is: (a) 1.2Ω (b) 144Ω (c) 120Ω (d) 100Ω

For what time period should a flow of 1019 electrons be maintained between two points A and B to have a constant current of 8 A between them?

what is LC oscillation and and parallel RCL circuit?

What are R and S configurations ?

Effective length of magnet is 31.4 cm and its pole strength is 0.5 A-m. Magnetic moment if it is bent in the form of a semicircle will be (in A-m2)

37.At a place horizontal and vertical components of the Earth's magnetic field are as follows: B(h) =1 G 10 degrees west of North B(v) =1 G vertically downwards Then angle of dip and declination are respectively?

The equivalent focal length of the given system is:(Refractive index for the lenses are given in the diagram)

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

Two plane mirrors are initially inclined at 30° and they move apart with an addition of 30° till the angle become 120°. Find the sum of the number of images formed in each case. (Mirrors are inclined symmetrically)

Pressure P1 is applied on a sphere of radius 5 cm. Keeping the thrust constant, if the radius of the sphere is decreased to 2.5 cm, the new pressure is found out to be P2. Find P2:P1.4

Why the conduction of electrolytic solution decreases with increase in concentration?

147. A current carrying circular loop lies on a smooth horizontal plane. Can a uniform magnetic field be set up in such a manner that the loop turns around itself (i.e. , turns about the vertical axis).

If A’ is the image of A then the light ray going from B and hitting the mirror at C will intersect the principal axis at which point?