16569 + Interview Questions in Physics

1.	What happens to the average kinetic energy of the molecules of a body when its temperatureis increased?
Answer» What happens to the average kinetic energy of the molecules of a body when its temperatureis increased?

Discussion

2.	When the live wire and the neutral wire come in contact, then the current suddenly increases in the circuit, causing spark and damage to the circuit, this situation is known as
Answer» When the live wire and the neutral wire come in contact, then the current suddenly increases in the circuit, causing spark and damage to the circuit, this situation is known as

Discussion

3.	A circular hole in an aluminium plate is 1 cm in diameter at 0∘. What is the diameter when the temperature of the plate is raised to 100∘. (coefficient of linear expansion of aluminium α=2.55×10−5/∘)
Answer» A circular hole in an aluminium plate is 1 cm in diameter at $0^{\circ}$ . What is the diameter when the temperature of the plate is raised to $100^{\circ}$ . (coefficient of linear expansion of aluminium $α = 2.55 \times 10^{- 5} /^{\circ}$ )

Discussion

4.	Q }11/15 If the force inside the earth surface varies as }r^n, where }r is the distance of body from the centre of } earth, then value of }n will be} a.1 b.2 c.-1 d.-
Answer» Q }11/15 If the force inside the earth surface varies as }r^n, where }r is the distance of body from the centre of } earth, then value of }n will be} a.1 b.2 c.-1 d.-

Discussion

5.	Two resistors, with resistances 5 Ω and 10 Ω respectively are to be connected to a battery of emf 6 V so as to obtain: (i) minimum current flowing (ii) maximum current flowing.(a) How will you connect the resistances in each case?(b) Calculate the strength of the total current in the circuit in two cases.
Answer» Two resistors, with resistances 5 Ω and 10 Ω respectively are to be connected to a battery of emf 6 V so as to obtain: (i) minimum current flowing (ii) maximum current flowing. (a) How will you connect the resistances in each case? (b) Calculate the strength of the total current in the circuit in two cases.

Discussion

6.	146.Calculate Speed of light in water
Answer» 146.Calculate Speed of light in water

Discussion

7.	Calculate the effective resistance of the following electric circuit.
Answer» Calculate the effective resistance of the following electric circuit.

Discussion

8.	ntConvex lens has mean focal length of20cm.The dispersive power of the material of the lens is 0.02.The long.chromatic aberation for an object at oo is?n nt00=infinityn
Answer» ntConvex lens has mean focal length of20cm.The dispersive power of the material of the lens is 0.02.The long.chromatic aberation for an object at oo is?n nt00=infinityn

Discussion

9.	While performing the experiment to determine the focal length of a convex lens by using the sun as the distant object, a student could not find a screen with stand. In the absence of a good screen, which of the following method is the most appropriate and safe to be used by the student?(1) He should focus the image of the sun on his hand(2) He should focus the image of the sun on his nylon shirt(3) He should focus the image of the sun on a wall of the room(4) He should focus the image of the sun on a carbon paper
Answer» While performing the experiment to determine the focal length of a convex lens by using the sun as the distant object, a student could not find a screen with stand. In the absence of a good screen, which of the following method is the most appropriate and safe to be used by the student? (1) He should focus the image of the sun on his hand (2) He should focus the image of the sun on his nylon shirt (3) He should focus the image of the sun on a wall of the room (4) He should focus the image of the sun on a carbon paper

Discussion

10.	A ray of light is incident on a prism ABC(AB=BC) & travels as shown. The refractive index of the prism material should be at least
Answer» A ray of light is incident on a prism $A B C (A B = B C)$ & travels as shown. The refractive index of the prism material should be at least

Discussion

11.	The charge flowing through a resistance R varies with time t as Q=at-bt^2 , where a and b are positive constants. The total heat produced in R is
Answer» The charge flowing through a resistance R varies with time t as Q=at-bt^2 , where a and b are positive constants. The total heat produced in R is

Discussion

12.	Question 4Choose the correct option.A rectangular coil of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each(a) two revolutions(b) one revolution(c) half revolution (d) one-fourth revolution
Answer» Question 4 Choose the correct option. A rectangular coil of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each (a) two revolutions (b) one revolution (c) half revolution (d) one-fourth revolution

Discussion

13.	A thin concavo-convex lens has focal length +60 cm. The radius of curvature of concave surface is double that of convex. The radii of curvature of two surfaces, if refractive index of material of lens is 1.4, are
Answer» A thin concavo-convex lens has focal length +60 cm. The radius of curvature of concave surface is double that of convex. The radii of curvature of two surfaces, if refractive index of material of lens is 1.4, are

Discussion

14.	what is sp2 hybridisation
Answer» what is sp2 hybridisation

Discussion

15.	A crowbar of length 120 cm has its fulcrum situated at a distance of 20 cm from the load. Calculate the mechanical advantage of the crowbar.
Answer» A crowbar of length 120 cm has its fulcrum situated at a distance of 20 cm from the load. Calculate the mechanical advantage of the crowbar.

Discussion

16.	a point charge q moves with a speed v in a circular path of radius r around a long uniformly charged conductor of linear charge density.The speed varies with r as 1) Vr^° 2)vr 3)v1/r 4)v1/r
Answer» a point charge q moves with a speed v in a circular path of radius r around a long uniformly charged conductor of linear charge density.The speed varies with r as 1) Vr^° 2)vr 3)v1/r 4)v1/r

Discussion

17.	Why do resistors connected in parallel have equal potential differences?
Answer» Why do resistors connected in parallel have equal potential differences?

Discussion

18.	What is the function of iris and muscles connected to the lens in the human eye?
Answer» What is the function of iris and muscles connected to the lens in the human eye?

Discussion

19.	A lens having focal lenght f and aperture size of diameter d forms an image of intensity I. Aperture of diameter d/2 in central region of lens is covered by black paper. Focal lenght of lens and intensity of image now will be?
Answer» A lens having focal lenght f and aperture size of diameter d forms an image of intensity I. Aperture of diameter d/2 in central region of lens is covered by black paper. Focal lenght of lens and intensity of image now will be?

Discussion

20.	Match the given phrases with the images and give reason for each. [5 MARKS]i.) Natural phenomenon for dispersionii.) 24 frames per secondiii.) Illuminated Objectiv.) For healthy eye sightv.)Luminous object
Answer» Match the given phrases with the images and give reason for each. [5 MARKS] i.) Natural phenomenon for dispersion ii.) 24 frames per second iii.) Illuminated Object iv.) For healthy eye sight v.)Luminous object

20.

Match the given phrases with the images and give reason for each. [5 MARKS]i.) Natural phenomenon for dispersionii.) 24 frames per secondiii.) Illuminated Objectiv.) For healthy eye sightv.)Luminous object

Answer»

Match the given phrases with the images and give reason for each. [5 MARKS]

i.) Natural phenomenon for dispersion

ii.) 24 frames per second

iii.) Illuminated Object

iv.) For healthy eye sight

v.)Luminous object

Discussion

21.	The rear face of an equiconvex lens of focal length 30 cm is silvered so that it behaves like a concave mirror. An object is placed at a distance of 7.5 cm in front of this silvered lens. Find distance (in cm) of image from pole. (μg=32)
Answer» The rear face of an equiconvex lens of focal length 30 cm is silvered so that it behaves like a concave mirror. An object is placed at a distance of 7.5 cm in front of this silvered lens. Find distance (in cm) of image from pole. $(μ_{g} = \frac{3}{2})$

Discussion

22.	can electric field lines be curved? explain?
Answer» can electric field lines be curved? explain?

Discussion

23.	Name a three sources of electricity and explain them.
Answer» Name a three sources of electricity and explain them.

Discussion

24.	When aq AgNO3 is electrolysed using Pt electrodes, if 3.2 g of O2 is liberated at the anode, the amount Ag that will be deposited at the cathode in grams is (at wt. of Ag = 108)
Answer» When aq AgNO₃ is electrolysed using Pt electrodes, if 3.2 g of O₂ is liberated at the anode, the amount Ag that will be deposited at the cathode in grams is (at wt. of Ag = 108)

24.

When aq AgNO3 is electrolysed using Pt electrodes, if 3.2 g of O2 is liberated at the anode, the amount Ag that will be deposited at the cathode in grams is (at wt. of Ag = 108)

Answer»

When aq AgNO₃ is electrolysed using Pt electrodes, if 3.2 g of O₂ is liberated at the anode, the amount Ag that will be deposited at the cathode in grams is (at wt. of Ag = 108)

Discussion

25.	The plastic moment capacity for the propped cantilever as shown in figure is W.1.364
Answer» The plastic moment capacity for the propped cantilever as shown in figure is W. 1.364

Discussion

26.	A wire of fixed length is wound on a solenoid of length l and radius r. its self inductance is found to be L. now if the same wire is wound over a solenoid of length 0.5l and radius 0.5r, then self inductance will be
Answer» A wire of fixed length is wound on a solenoid of length l and radius r. its self inductance is found to be L. now if the same wire is wound over a solenoid of length 0.5l and radius 0.5r, then self inductance will be

Discussion

27.	A voltmeter and ammeter are connected in a circuit of variable voltage as shown in the figure, a graph of reading on volmeter and Ammerer is drawn.Which of the following best represents the graph?
Answer» A voltmeter and ammeter are connected in a circuit of variable voltage as shown in the figure, a graph of reading on volmeter and Ammerer is drawn. Which of the following best represents the graph?

Discussion

28.	Calculate the current flowing through 1.5 kW-250 V electric heater and also find its resistance. [3 MARKS]
Answer» Calculate the current flowing through 1.5 kW-250 V electric heater and also find its resistance. [3 MARKS]

Discussion

29.	Explain how surface area and temperature affect the rate of reaction ?
Answer» Explain how surface area and temperature affect the rate of reaction ?

Discussion

30.	What is aperture
Answer» What is aperture

Discussion

31.	If the charge on an electron be 1.6×10−19 C, __ electrons should pass through a conductor in 1 second to constitute 1 ampere current.
Answer» If the charge on an electron be $1.6 \times 10^{- 19}$ C, __ electrons should pass through a conductor in 1 second to constitute 1 ampere current.

Discussion

32.	How will the magnitude of magnification change if an object placed at center of curvature is moved towards the focus?
Answer» How will the magnitude of magnification change if an object placed at center of curvature is moved towards the focus?

Discussion

33.	A rod of mass M and length L is hinged at point P. The rod is kept horizontal by a Msssless string tied to point Q As shown in fig. When string is cut, the initial angular Acceleration of the rod is
Answer» A rod of mass M and length L is hinged at point P. The rod is kept horizontal by a Msssless string tied to point Q As shown in fig. When string is cut, the initial angular Acceleration of the rod is

Discussion

34.	___ is the primary source of wind energy.
Answer» ___ is the primary source of wind energy.

Discussion

35.	Two different coils have self-inductance L1=8 mH and L2=2 mH. The currents in both the coils is increased at a same constant rate. At a certain instant of time, the power given to both the coils is the same. At that time the current and the induced voltage in the first coil are, i1 and V1 respectively. Corresponding values for the second coil, at the same instant are, i2 and V2 respectively. Then -
Answer» Two different coils have self-inductance $L_{1} = 8 mH$ and $L_{2} = 2 mH$ . The currents in both the coils is increased at a same constant rate. At a certain instant of time, the power given to both the coils is the same. At that time the current and the induced voltage in the first coil are, $i_{1}$ and $V_{1}$ respectively. Corresponding values for the second coil, at the same instant are, $i_{2}$ and $V_{2}$ respectively. Then -

Discussion

36.	Which of the following are a non-renewable source of energy:
Answer» Which of the following are a non-renewable source of energy:

Discussion

37.	A small block of mass m is kept on a rough inclined surface of inclination θ. The block does not slide on the surface. The work done by friction on block in time t will bea) Zerob) -mgvt sinθ.cosθc) mgvt sin ²θd) mgvt cos2θ
Answer» A small block of mass m is kept on a rough inclined surface of inclination θ. The block does not slide on the surface. The work done by friction on block in time t will be a) Zero b) -mgvt sinθ.cosθ c) mgvt sin ²θ d) mgvt cos2θ

Discussion

38.	If TEN ∼ MVG and MAP ∼ KZN, then BOM ∼ ?
Answer» If TEN ∼ MVG and MAP ∼ KZN, then BOM ∼ ?

Discussion

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

Discussion

40.	Find force on the proton when placed in the electric field of 16N/C applied east to west .Also find the direction of force on the proton due this electric field ?
Answer» Find force on the proton when placed in the electric field of 16N/C applied east to west .Also find the direction of force on the proton due this electric field ?

Discussion

41.	Gravitational law in vector form ? Gravitational potential energy ?
Answer» Gravitational law in vector form ? Gravitational potential energy ?

Discussion

42.	15. Three point masses each of mass m are placed at the vertices of an equilateral triangle of side a. The gravitational potential due to these masses at the centroid of the triangle is??
Answer» 15. Three point masses each of mass m are placed at the vertices of an equilateral triangle of side a. The gravitational potential due to these masses at the centroid of the triangle is??

Discussion

43.	What is Critical angl
Answer» What is Critical angl

Discussion

44.	Which of the following instruments does not have plus (+) or minus (–) sign marked on it while representing in a circuit diagram?(1) Rheostat(2) Voltmeter(3) Ammeter(4) Cell
Answer» Which of the following instruments does not have plus (+) or minus (–) sign marked on it while representing in a circuit diagram? (1) Rheostat (2) Voltmeter (3) Ammeter (4) Cell

Discussion

45.	Differentiate between acceleration due to gravity and universal gravitational constant.
Answer» Differentiate between acceleration due to gravity and universal gravitational constant.

Discussion

46.	25. What is Flagpole interaction? and where it is present?
Answer» 25. What is Flagpole interaction? and where it is present?

Discussion

47.	In parallel combination, the total resistance of the circuit becomes ___the individual resistances.
Answer» In parallel combination, the total resistance of the circuit becomes ___the individual resistances.

Discussion

48.	an object of mass 1 kg thrown vertically upward with a speed of 35 m/s the net work done by force of gravity during 4th second of its motion is (take g=10m/s^2)
Answer» an object of mass 1 kg thrown vertically upward with a speed of 35 m/s the net work done by force of gravity during 4th second of its motion is (take g=10m/s^2)

Discussion

49.	a. State the principle of transformers b. What are the factors depends on the induced electricity in a secondary coil. c.How motor is different from dynamo d.Find the ratio of primary and secondary coil to get 12 volt from the 240 volt electric source?
Answer» a. State the principle of transformers b. What are the factors depends on the induced electricity in a secondary coil. c.How motor is different from dynamo d.Find the ratio of primary and secondary coil to get 12 volt from the 240 volt electric source?

Discussion

50.	A machine lifts up a load of 500 kg by a height of 2 m. Calculate the efficiency of the machine if the energy input to the machine is 25000 J. (Take g=10 ms−2).0.4
Answer» A machine lifts up a load of $500 k g$ by a height of $2 m$ . Calculate the efficiency of the machine if the energy input to the machine is $25000 J$ . (Take $g = 10 m s^{- 2}$ ). 0.4

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

What happens to the average kinetic energy of the molecules of a body when its temperatureis increased?

When the live wire and the neutral wire come in contact, then the current suddenly increases in the circuit, causing spark and damage to the circuit, this situation is known as

A circular hole in an aluminium plate is 1 cm in diameter at 0∘. What is the diameter when the temperature of the plate is raised to 100∘. (coefficient of linear expansion of aluminium α=2.55×10−5/∘)

Q }11/15 If the force inside the earth surface varies as }r^n, where }r is the distance of body from the centre of } earth, then value of }n will be} a.1 b.2 c.-1 d.-

146.Calculate Speed of light in water

Calculate the effective resistance of the following electric circuit.

ntConvex lens has mean focal length of20cm.The dispersive power of the material of the lens is 0.02.The long.chromatic aberation for an object at oo is?n nt00=infinityn

A ray of light is incident on a prism ABC(AB=BC) &amp; travels as shown. The refractive index of the prism material should be at least

The charge flowing through a resistance R varies with time t as Q=at-bt^2 , where a and b are positive constants. The total heat produced in R is

Question 4Choose the correct option.A rectangular coil of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each(a) two revolutions(b) one revolution(c) half revolution (d) one-fourth revolution

A thin concavo-convex lens has focal length +60 cm. The radius of curvature of concave surface is double that of convex. The radii of curvature of two surfaces, if refractive index of material of lens is 1.4, are

what is sp2 hybridisation

A crowbar of length 120 cm has its fulcrum situated at a distance of 20 cm from the load. Calculate the mechanical advantage of the crowbar.

a point charge q moves with a speed v in a circular path of radius r around a long uniformly charged conductor of linear charge density.The speed varies with r as 1) Vr^° 2)vr 3)v1/r 4)v1/r

Why do resistors connected in parallel have equal potential differences?

What is the function of iris and muscles connected to the lens in the human eye?

A lens having focal lenght f and aperture size of diameter d forms an image of intensity I. Aperture of diameter d/2 in central region of lens is covered by black paper. Focal lenght of lens and intensity of image now will be?

Match the given phrases with the images and give reason for each. [5 MARKS]i.) Natural phenomenon for dispersionii.) 24 frames per secondiii.) Illuminated Objectiv.) For healthy eye sightv.)Luminous object

The rear face of an equiconvex lens of focal length 30 cm is silvered so that it behaves like a concave mirror. An object is placed at a distance of 7.5 cm in front of this silvered lens. Find distance (in cm) of image from pole. (μg=32)

can electric field lines be curved? explain?

Name a three sources of electricity and explain them.

When aq AgNO3 is electrolysed using Pt electrodes, if 3.2 g of O2 is liberated at the anode, the amount Ag that will be deposited at the cathode in grams is (at wt. of Ag = 108)

The plastic moment capacity for the propped cantilever as shown in figure is W.1.364

A wire of fixed length is wound on a solenoid of length l and radius r. its self inductance is found to be L. now if the same wire is wound over a solenoid of length 0.5l and radius 0.5r, then self inductance will be

A voltmeter and ammeter are connected in a circuit of variable voltage as shown in the figure, a graph of reading on volmeter and Ammerer is drawn.Which of the following best represents the graph?

Calculate the current flowing through 1.5 kW-250 V electric heater and also find its resistance. [3 MARKS]

Explain how surface area and temperature affect the rate of reaction ?

What is aperture

If the charge on an electron be 1.6×10−19 C, __ electrons should pass through a conductor in 1 second to constitute 1 ampere current.

How will the magnitude of magnification change if an object placed at center of curvature is moved towards the focus?

A rod of mass M and length L is hinged at point P. The rod is kept horizontal by a Msssless string tied to point Q As shown in fig. When string is cut, the initial angular Acceleration of the rod is

___ is the primary source of wind energy.

Which of the following are a non-renewable source of energy:

A small block of mass m is kept on a rough inclined surface of inclination θ. The block does not slide on the surface. The work done by friction on block in time t will bea) Zerob) -mgvt sinθ.cosθc) mgvt sin ²θd) mgvt cos2θ

If TEN ∼ MVG and MAP ∼ KZN, then BOM ∼ ?

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

Find force on the proton when placed in the electric field of 16N/C applied east to west .Also find the direction of force on the proton due this electric field ?

Gravitational law in vector form ? Gravitational potential energy ?

15. Three point masses each of mass m are placed at the vertices of an equilateral triangle of side a. The gravitational potential due to these masses at the centroid of the triangle is??

What is Critical angl

Which of the following instruments does not have plus (+) or minus (–) sign marked on it while representing in a circuit diagram?(1) Rheostat(2) Voltmeter(3) Ammeter(4) Cell

Differentiate between acceleration due to gravity and universal gravitational constant.

25. What is Flagpole interaction? and where it is present?

In parallel combination, the total resistance of the circuit becomes ___the individual resistances.

an object of mass 1 kg thrown vertically upward with a speed of 35 m/s the net work done by force of gravity during 4th second of its motion is (take g=10m/s^2)

a. State the principle of transformers b. What are the factors depends on the induced electricity in a secondary coil. c.How motor is different from dynamo d.Find the ratio of primary and secondary coil to get 12 volt from the 240 volt electric source?

A machine lifts up a load of 500 kg by a height of 2 m. Calculate the efficiency of the machine if the energy input to the machine is 25000 J. (Take g=10 ms−2).0.4

A ray of light is incident on a prism ABC(AB=BC) & travels as shown. The refractive index of the prism material should be at least