16569 + Interview Questions in Physics

1.	Electrons are responsible for conducting in a conductor. The speed of electron is not very high. Then, how the bulb is on immediately even though the switch and bulb are away from each other in a household circuit?
Answer» Electrons are responsible for conducting in a conductor. The speed of electron is not very high. Then, how the bulb is on immediately even though the switch and bulb are away from each other in a household circuit?

Discussion

2.	the sodium yellow doublet have wavelengths 5890 angstrom and λ angstrom and resolving power of a grating to resolve these lines is 982 then value of λ is
Answer» the sodium yellow doublet have wavelengths 5890 angstrom and λ angstrom and resolving power of a grating to resolve these lines is 982 then value of λ is

Discussion

3.	The figure given below shows the magnetic field between two magnets : (i) Copy the diagram and label the other poles of the magnets. (ii) Which is the weaker magnet?
Answer» The figure given below shows the magnetic field between two magnets : (i) Copy the diagram and label the other poles of the magnets. (ii) Which is the weaker magnet?

3.

The figure given below shows the magnetic field between two magnets : (i) Copy the diagram and label the other poles of the magnets. (ii) Which is the weaker magnet?

Answer»

The figure given below shows the magnetic field between two magnets :

(i) Copy the diagram and label the other poles of the magnets.

(ii) Which is the weaker magnet?

Discussion

4.	The resistance of a metallic wire is doubled by stretching it along its length.The ratio of initial to final length will be
Answer» The resistance of a metallic wire is doubled by stretching it along its length.The ratio of initial to final length will be

Discussion

5.	A certain stable nuclide after absorbing a neutron, emits β− particle and the new nuclide formed splits spontaneously into two α− particles. The nuclide is-
Answer» A certain stable nuclide after absorbing a neutron, emits $β -$ particle and the new nuclide formed splits spontaneously into two $α -$ particles. The nuclide is-

Discussion

6.	Heat is supplied at the same rate to equal masses of ice and water at the melting point (MP) of ice. Calculate the ratio of the time required to melt the ice and to bring the water to its Boiling Point. [Given that specific heat capacity of water = 4.2 J/goC, Specific latent heat of ice = 336 J/g]
Answer» Heat is supplied at the same rate to equal masses of ice and water at the melting point (MP) of ice. Calculate the ratio of the time required to melt the ice and to bring the water to its Boiling Point. [Given that specific heat capacity of water = 4.2 J/g^oC, Specific latent heat of ice = 336 J/g]

Discussion

7.	Refractive index of glass is 1.6 and that of diamond 2.4. Find the refractive index of glass with respect to diamond and diamond with respect to that of glass
Answer» Refractive index of glass is 1.6 and that of diamond 2.4. Find the refractive index of glass with respect to diamond and diamond with respect to that of glass

Discussion

8.	At a place horizontal and vertical components of earth magnetic fields are as follows Bh =3G5^°west to North Bv =1G vertically upward Then , angle of inclination and declination are respectively 1 60^° , 5^° W 2 30^° , 5^° W 3 30^° , 5^° E 4 60 ,5^° E
Answer» At a place horizontal and vertical components of earth magnetic fields are as follows Bh =3G5^°west to North Bv =1G vertically upward Then , angle of inclination and declination are respectively 1 60^° , 5^° W 2 30^° , 5^° W 3 30^° , 5^° E 4 60 ,5^° E

Discussion

9.	The distance X moved by a body of mass 0.5 kgunder the action of a force varies with time t asxm) = 3f+ 4t + 5 (here t is expresed in second).What is the work done by the force in firs2 seconds?(1) 20 J(2) 40 J783(3) 50 J(4) 60 J
Answer» The distance X moved by a body of mass 0.5 kgunder the action of a force varies with time t asxm) = 3f+ 4t + 5 (here t is expresed in second).What is the work done by the force in firs2 seconds?(1) 20 J(2) 40 J783(3) 50 J(4) 60 J

Discussion

10.	A body is moving with decreasing velocity in circular path . explain effect on angular momentum
Answer» A body is moving with decreasing velocity in circular path . explain effect on angular momentum

Discussion

11.	The potential difference applied to an X-ray tube is 5 kV and the current through it is 3.2 mA. The number of electrons striking the target per second is
Answer» The potential difference applied to an X-ray tube is 5 kV and the current through it is 3.2 mA. The number of electrons striking the target per second is

Discussion

12.	why aperture becomes 1/√2 times on cutting a lens through principle axis ?
Answer» why aperture becomes 1/√2 times on cutting a lens through principle axis ?

Discussion

13.	what is meant by reservior ?
Answer» what is meant by reservior ?

Discussion

14.	a wire of uniform thickness with a resistance 9 ohm is cut into 3 equal parts. what is the resistance of each part ?
Answer» a wire of uniform thickness with a resistance 9 ohm is cut into 3 equal parts. what is the resistance of each part ?

Discussion

15.	Which among the following elements in the given circuit is the load ?
Answer» Which among the following elements in the given circuit is the load ?

Discussion

16.	36.A letter 'A' is constructed of uniform wire of resistance 1 Ohm/cm . The sides of the letter are 6 cm each and the cross piece in the middle is 3 cm long .Calculate the resistance between the ends of the legs
Answer» 36.A letter 'A' is constructed of uniform wire of resistance 1 Ohm/cm . The sides of the letter are 6 cm each and the cross piece in the middle is 3 cm long .Calculate the resistance between the ends of the legs

Discussion

17.	A transformer has 1500 turns in the primary coil and 1125 turns in the secondary coil. If the voltage in the primary coil is 200 V, then the voltage in the secondary coil is
Answer» A transformer has 1500 turns in the primary coil and 1125 turns in the secondary coil. If the voltage in the primary coil is 200 V, then the voltage in the secondary coil is

Discussion

18.	2. Explain potential difference with the help of diagram .
Answer» 2. Explain potential difference with the help of diagram .

Discussion

19.	The potential difference applied to a 3.2 mA X -ray tube is 5 kV. The number of the electrons striking the target per second is .
Answer» The potential difference applied to a 3.2 mA X -ray tube is 5 kV. The number of the electrons striking the target per second is .

Discussion

20.	The time required to remove electrolytically one half from 0.2 litres of 1M AgNO3 solution by a current of 1 amp
Answer» The time required to remove electrolytically one half from 0.2 litres of 1M AgNO3 solution by a current of 1 amp

Discussion

21.	95.A thin copper wire of length l meter increases in length by 2% when heated through 10^°C. What is the % increase in area when a square copper sheet of length l meter is heated through 10.?
Answer» 95.A thin copper wire of length l meter increases in length by 2% when heated through 10^°C. What is the % increase in area when a square copper sheet of length l meter is heated through 10.?

Discussion

22.	64. Consider the electrochemical reaction between Ag_{(s)} and C{l_2}_{(g)} electrodes in 1 litre of 0.1M KCl aqueous solution. Solubility product of AgCl is 1.8×10^{-10} and F=96500C/mol. At 1×10^{-6}A current calculate the time required to start observing the AgCl precipitation in the galvanic cell
Answer» 64. Consider the electrochemical reaction between Ag_{(s)} and C{l_2}_{(g)} electrodes in 1 litre of 0.1M KCl aqueous solution. Solubility product of AgCl is 1.8×10^{-10} and F=96500C/mol. At 1×10^{-6}A current calculate the time required to start observing the AgCl precipitation in the galvanic cell

Discussion

23.	Derivation of potential of a dipole?
Answer» Derivation of potential of a dipole?

Discussion

24.	Two point charges +4q and +q are separated by distance r, where should a third point charge Q be placed that the whole system remains in equilibrium
Answer» Two point charges +4q and +q are separated by distance r, where should a third point charge Q be placed that the whole system remains in equilibrium

Discussion

25.

Name Age Year of becoming an astronaut No. of space Journeys Experience with zero gravity Ways of staying fit Memorable moments What one has learnt from the travels Pamela Melroy

Answer»

Name	Age	Year of becoming an astronaut	No. of space Journeys	Experience with zero gravity	Ways of staying fit	Memorable moments	What one has learnt from the travels
Pamela Melroy

Discussion

26.	Is electronic volt ( the unit of energy ) and work done by a electron is same
Answer» Is electronic volt ( the unit of energy ) and work done by a electron is same

Discussion

27.	To an astronaut, why does the sky appear dark instead of blue?
Answer» To an astronaut, why does the sky appear dark instead of blue?

Discussion

28.	ntq) A and B are the two points on a uniform ring of radius r . The resistance of the ring R and angle AOB= theta . The equivalent resistance between points A and B is'?n
Answer» ntq) A and B are the two points on a uniform ring of radius r . The resistance of the ring R and angle AOB= theta . The equivalent resistance between points A and B is'?n

Discussion

29.	focal length of a magnifying glass is 12.5cm. ratio of maximum and minimum magnifying power is1)2:32)1:33)3:14)3:2
Answer» focal length of a magnifying glass is 12.5cm. ratio of maximum and minimum magnifying power is 1)2:3 2)1:3 3)3:1 4)3:2

Discussion

30.	If a heater of resistance 100 Ω draws a current of 5 A for 1 hour, then the energy consumed by the heater is:
Answer» If a heater of resistance $100 Ω$ draws a current of $5 A$ for $1 h o u r$ , then the energy consumed by the heater is:

Discussion

31.	In Fig shows a uniform metre rule of weight W supported on a fulcrum at the 60 cm mark by applying the effort E at the 90 cm mark. (a) State with reason whether the weight W of the rule is greater than, less than or equal to the effort E. (b) Find the mechanical advantage in an ideal case.
Answer» In Fig shows a uniform metre rule of weight W supported on a fulcrum at the 60 cm mark by applying the effort E at the 90 cm mark. (a) State with reason whether the weight W of the rule is greater than, less than or equal to the effort E. (b) Find the mechanical advantage in an ideal case.

31.

In Fig shows a uniform metre rule of weight W supported on a fulcrum at the 60 cm mark by applying the effort E at the 90 cm mark. (a) State with reason whether the weight W of the rule is greater than, less than or equal to the effort E. (b) Find the mechanical advantage in an ideal case.

Answer»

In Fig shows a uniform metre rule of weight W supported on a fulcrum at the 60 cm mark by applying the effort E at the 90 cm mark.

(a) State with reason whether the weight W of the rule is greater than, less than or equal to the effort E.

(b) Find the mechanical advantage in an ideal case.

Discussion

32.	A student has to do the experiment on finding the focal length of a given concave mirror by using a distant object. Out of the following 'set-ups' A, B, C and D available to him:A : a screen, a mirror holder and a scaleB : a mirror holder, a screen holder and a scaleC : a screen holder and a scaleD : a mirror holder and a scaleThe 'set-up' which is likely to give him the best result is :(1) A(2) B(3) C(4) D
Answer» A student has to do the experiment on finding the focal length of a given concave mirror by using a distant object. Out of the following 'set-ups' A, B, C and D available to him: A : a screen, a mirror holder and a scale B : a mirror holder, a screen holder and a scale C : a screen holder and a scale D : a mirror holder and a scale The 'set-up' which is likely to give him the best result is : (1) A (2) B (3) C (4) D

Discussion

33.	Name a piece of apparatus other than plane mirror, which can be used to turn a ray of light through 90 degree ?
Answer» Name a piece of apparatus other than plane mirror, which can be used to turn a ray of light through 90 degree ?

Discussion

34.	Question 5Compare and contrast bio-mass and hydro electricity as sources of energy.
Answer» Question 5 Compare and contrast bio-mass and hydro electricity as sources of energy.

Discussion

35.	AB is object, A'B' is image formed.
Answer» AB is object, A'B' is image formed.

35.

AB is object, A'B' is image formed.

Answer»

AB is object, A'B' is image formed.

Discussion

36.	what is the difference between series and parallel combination of resisto
Answer» what is the difference between series and parallel combination of resisto

Discussion

37.	Define balanced forces. [1 MARK]
Answer» Define balanced forces. [1 MARK]

Discussion

38.	the heat produced in a long wire is characterised by resis†an ce,current andtime through which the current and time through which the current passes . if the errors in the measurements these quantities are respectively 1%,2%and 1%, then the total error incaqlculating the energy produced is
Answer» the heat produced in a long wire is characterised by resis†an ce,current andtime through which the current and time through which the current passes . if the errors in the measurements these quantities are respectively 1%,2%and 1%, then the total error incaqlculating the energy produced is

Discussion

39.	23.If B1; B2; and B3 are the magnetic field due to I1; I2; and I3; then in ampere's circuital law B is
Answer» 23.If B1; B2; and B3 are the magnetic field due to I1; I2; and I3; then in ampere's circuital law B is

Discussion

40.	two positive charges are located at points a and b. while moving from a to b potential between charges
Answer» two positive charges are located at points a and b. while moving from a to b potential between charges

Discussion

41.	A wire of resistance 4ohms is bent to form a circle .What is the resistance between two diametrically opposite ends ?
Answer» A wire of resistance 4ohms is bent to form a circle .What is the resistance between two diametrically opposite ends ?

Discussion

42.	Refractive index of water is 43 and of glass is 32. What is the refractive index of glass w.r.t water?
Answer» Refractive index of water is $\frac{4}{3}$ and of glass is $\frac{3}{2}$ . What is the refractive index of glass w.r.t water?

Discussion

43.	1 g charcoal adsorbs 100 ml of 0.5 M CH3CHOOH to form a monolayer. As a result molarity of acetic acid reduces to 0.49 M. What will be the surface area covered by each molecule of acetic acid? Given that surface area of charcoal =3.01×102m2/g.
Answer» 1 g charcoal adsorbs 100 ml of 0.5 M $C H_{3} C H O O H$ to form a monolayer. As a result molarity of acetic acid reduces to 0.49 M. What will be the surface area covered by each molecule of acetic acid? Given that surface area of charcoal $= 3.01 \times 10^{2} m^{2} / g$ .

Discussion

44.	Suppose the moon emits light of its own. Would it still have phases? Justify your answer.
Answer» Suppose the moon emits light of its own. Would it still have phases? Justify your answer.

Discussion

45.	How to identify series and parallel connection?
Answer» How to identify series and parallel connection?

Discussion

46.	A metal rod OA of length l=50 cm is kept rotating with a constant angular speed of ω=10 rad s−1 about point O as shown in the figure. The free end A is arranged to slide without friction along a fixed uniform circular ring in the same plane as that of rotation. A uniform magnetic field of magnitude B=2 T exists in the region as shown in the figure. An inductor of inductance L=4 H and an external resistance R=8 Ω are connected through a switch S. If the switch is closed at t=0, find the current flowing through the resistance at t=1 s.[Use e−2=0.135]
Answer» A metal rod $OA$ of length $l = 50 cm$ is kept rotating with a constant angular speed of $ω = 10 {rad s}^{- 1}$ about point $O$ as shown in the figure. The free end $A$ is arranged to slide without friction along a fixed uniform circular ring in the same plane as that of rotation. A uniform magnetic field of magnitude $B = 2 T$ exists in the region as shown in the figure. An inductor of inductance $L = 4 H$ and an external resistance $R = 8 Ω$ are connected through a switch $S .$ If the switch is closed at $t = 0$ , find the current flowing through the resistance at $t = 1 s .$ [Use $e^{- 2} = 0.135$ ]

Discussion

47.	Why photodiode don't convert light energy to electrical energy like solar cell?Explain in detail
Answer» Why photodiode don't convert light energy to electrical energy like solar cell? Explain in detail

Discussion

48.	Jordan is able to lift a car of mass 2000 kg with a force of 1000 N using a car jack. Find the mechanical advantage of the car jack. (Given, g=10 ms−2)20
Answer» Jordan is able to lift a car of mass $2000 k g$ with a force of $1000 N$ using a car jack. Find the mechanical advantage of the car jack. (Given, $g = 10 m s^{- 2}$ ) 20

Discussion

49.	A geyser has the rating 2000 W-220 V marked on it. What should be the minimum current rating of the fuse wire to be used?
Answer» A geyser has the rating 2000 W-220 V marked on it. What should be the minimum current rating of the fuse wire to be used?

Discussion

50.	Which colour of the spectrum has (a) longest wavelength, and (b) shortest wavelength ?
Answer» Which colour of the spectrum has (a) longest wavelength, and (b) shortest wavelength ?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Electrons are responsible for conducting in a conductor. The speed of electron is not very high. Then, how the bulb is on immediately even though the switch and bulb are away from each other in a household circuit?

the sodium yellow doublet have wavelengths 5890 angstrom and λ angstrom and resolving power of a grating to resolve these lines is 982 then value of λ is

The figure given below shows the magnetic field between two magnets : (i) Copy the diagram and label the other poles of the magnets. (ii) Which is the weaker magnet?

The resistance of a metallic wire is doubled by stretching it along its length.The ratio of initial to final length will be

A certain stable nuclide after absorbing a neutron, emits β− particle and the new nuclide formed splits spontaneously into two α− particles. The nuclide is-

Heat is supplied at the same rate to equal masses of ice and water at the melting point (MP) of ice. Calculate the ratio of the time required to melt the ice and to bring the water to its Boiling Point. [Given that specific heat capacity of water = 4.2 J/goC, Specific latent heat of ice = 336 J/g]

Refractive index of glass is 1.6 and that of diamond 2.4. Find the refractive index of glass with respect to diamond and diamond with respect to that of glass

At a place horizontal and vertical components of earth magnetic fields are as follows Bh =3G5^°west to North Bv =1G vertically upward Then , angle of inclination and declination are respectively 1 60^° , 5^° W 2 30^° , 5^° W 3 30^° , 5^° E 4 60 ,5^° E

The distance X moved by a body of mass 0.5 kgunder the action of a force varies with time t asxm) = 3f+ 4t + 5 (here t is expresed in second).What is the work done by the force in firs2 seconds?(1) 20 J(2) 40 J783(3) 50 J(4) 60 J

A body is moving with decreasing velocity in circular path . explain effect on angular momentum

The potential difference applied to an X-ray tube is 5 kV and the current through it is 3.2 mA. The number of electrons striking the target per second is

why aperture becomes 1/√2 times on cutting a lens through principle axis ?

what is meant by reservior ?

a wire of uniform thickness with a resistance 9 ohm is cut into 3 equal parts. what is the resistance of each part ?

Which among the following elements in the given circuit is the load ?

36.A letter 'A' is constructed of uniform wire of resistance 1 Ohm/cm . The sides of the letter are 6 cm each and the cross piece in the middle is 3 cm long .Calculate the resistance between the ends of the legs

A transformer has 1500 turns in the primary coil and 1125 turns in the secondary coil. If the voltage in the primary coil is 200 V, then the voltage in the secondary coil is

2. Explain potential difference with the help of diagram .

The potential difference applied to a 3.2 mA X -ray tube is 5 kV. The number of the electrons striking the target per second is .

The time required to remove electrolytically one half from 0.2 litres of 1M AgNO3 solution by a current of 1 amp

95.A thin copper wire of length l meter increases in length by 2% when heated through 10^°C. What is the % increase in area when a square copper sheet of length l meter is heated through 10.?

Derivation of potential of a dipole?

Two point charges +4q and +q are separated by distance r, where should a third point charge Q be placed that the whole system remains in equilibrium

Name Age Year of becoming an astronaut No. of space Journeys Experience with zero gravity Ways of staying fit Memorable moments What one has learnt from the travels Pamela Melroy

Is electronic volt ( the unit of energy ) and work done by a electron is same

To an astronaut, why does the sky appear dark instead of blue?

ntq) A and B are the two points on a uniform ring of radius r . The resistance of the ring R and angle AOB= theta . The equivalent resistance between points A and B is'?n

focal length of a magnifying glass is 12.5cm. ratio of maximum and minimum magnifying power is1)2:32)1:33)3:14)3:2

If a heater of resistance 100 Ω draws a current of 5 A for 1 hour, then the energy consumed by the heater is:

In Fig shows a uniform metre rule of weight W supported on a fulcrum at the 60 cm mark by applying the effort E at the 90 cm mark. (a) State with reason whether the weight W of the rule is greater than, less than or equal to the effort E. (b) Find the mechanical advantage in an ideal case.

Name a piece of apparatus other than plane mirror, which can be used to turn a ray of light through 90 degree ?

Question 5Compare and contrast bio-mass and hydro electricity as sources of energy.

AB is object, A'B' is image formed.

what is the difference between series and parallel combination of resisto

Define balanced forces. [1 MARK]

the heat produced in a long wire is characterised by resis†an ce,current andtime through which the current and time through which the current passes . if the errors in the measurements these quantities are respectively 1%,2%and 1%, then the total error incaqlculating the energy produced is

23.If B1; B2; and B3 are the magnetic field due to I1; I2; and I3; then in ampere's circuital law B is

two positive charges are located at points a and b. while moving from a to b potential between charges

A wire of resistance 4ohms is bent to form a circle .What is the resistance between two diametrically opposite ends ?

Refractive index of water is 43 and of glass is 32. What is the refractive index of glass w.r.t water?

1 g charcoal adsorbs 100 ml of 0.5 M CH3CHOOH to form a monolayer. As a result molarity of acetic acid reduces to 0.49 M. What will be the surface area covered by each molecule of acetic acid? Given that surface area of charcoal =3.01×102m2/g.

Suppose the moon emits light of its own. Would it still have phases? Justify your answer.

How to identify series and parallel connection?

Why photodiode don't convert light energy to electrical energy like solar cell?Explain in detail

Jordan is able to lift a car of mass 2000 kg with a force of 1000 N using a car jack. Find the mechanical advantage of the car jack. (Given, g=10 ms−2)20

A geyser has the rating 2000 W-220 V marked on it. What should be the minimum current rating of the fuse wire to be used?

Which colour of the spectrum has (a) longest wavelength, and (b) shortest wavelength ?