16569 + Interview Questions in Physics

1.	41.The distance of a particle moving on a circle of radius 12m measured from a fixed point on the circle and measured along the circle is given by s=2t³(in meters).The ratio of its tangential to centripetal acceleration at t=2s is ?
Answer» 41.The distance of a particle moving on a circle of radius 12m measured from a fixed point on the circle and measured along the circle is given by s=2t³(in meters).The ratio of its tangential to centripetal acceleration at t=2s is ?

Discussion

2.	A student is performing an experiment to study the formation of image of a lighted candle by a converging lens. The converging lens has a focal length of 25 cm and the candle is placed at a distance of 15 cm from the lens.(a) State three characteristics of the image of the candle so formed which will be observed by the student.(b) Name a simple device which works under these conditions.
Answer» A student is performing an experiment to study the formation of image of a lighted candle by a converging lens. The converging lens has a focal length of 25 cm and the candle is placed at a distance of 15 cm from the lens. (a) State three characteristics of the image of the candle so formed which will be observed by the student. (b) Name a simple device which works under these conditions.

Discussion

3.	A ray of light travelling in a medium of refractive index 1.8 enters into a medium with refractive index 1.5. Then the speed of light in the rarer medium will (1)Increase by a factor of 1.5 (2)Decrease (3)Remain same (4)Increase by a factor of 1.2
Answer» A ray of light travelling in a medium of refractive index 1.8 enters into a medium with refractive index 1.5. Then the speed of light in the rarer medium will (1)Increase by a factor of 1.5 (2)Decrease (3)Remain same (4)Increase by a factor of 1.2

Discussion

4.	Question 2 In the following circuits (Figure), heat produced in the resistor or combination of resistors connected to a 12V battery will be (a) same in all the cases (b) minimum in case (i) (c) maximum in case (ii) (d) maximum in case (iii)
Answer» Question 2 In the following circuits (Figure), heat produced in the resistor or combination of resistors connected to a 12V battery will be (a) same in all the cases (b) minimum in case (i) (c) maximum in case (ii) (d) maximum in case (iii)

Discussion

5.	Two objects have equal momentum but masses in the ratio 3:2. Calculate the ratio of their velocities.
Answer» Two objects have equal momentum but masses in the ratio 3:2. Calculate the ratio of their velocities.

Discussion

6.	A generating station having n-section busbars each rated at 8 kVA with x% reactance is connected on the tie-bars system through busbar reactance of b%. If n is very large and a three phase fault takes place on one section then the short circuit kVA is
Answer» A generating station having n-section busbars each rated at 8 kVA with x% reactance is connected on the tie-bars system through busbar reactance of b%. If n is very large and a three phase fault takes place on one section then the short circuit kVA is

Discussion

7.	Select from the following the best set-up for tracing the path of a ray of light through a rectangular glass slab:
Answer» Select from the following the best set-up for tracing the path of a ray of light through a rectangular glass slab:

7.

Select from the following the best set-up for tracing the path of a ray of light through a rectangular glass slab:

Answer»

Select from the following the best set-up for tracing the path of a ray of light through a rectangular glass slab:

Discussion

8.	An electrical appliance has a rating of 4.5 kW−220 V. Which of the following could be the current rating of the fuse (in A) to be used with the appliance?
Answer» An electrical appliance has a rating of $4.5 kW - 220 V$ . Which of the following could be the current rating of the fuse (in $A$ ) to be used with the appliance?

Discussion

9.	What is water shed management ? List any two advantages to it ?
Answer» What is water shed management ? List any two advantages to it ?

Discussion

10.	Write brief answers.a. Describe a clinical thermometer. How does it differ from the thermometer used in laboratory?b. What is the difference between heat and temperature ? what are their units.c. Explain the construction of a calorimeter. Draw the necessary figure.d. Explain why rails have gaps at specific distances.e. Explain with the help of formulae the expansion coefficients of liquid and gas.
Answer» Write brief answers. a. Describe a clinical thermometer. How does it differ from the thermometer used in laboratory? b. What is the difference between heat and temperature ? what are their units. c. Explain the construction of a calorimeter. Draw the necessary figure. d. Explain why rails have gaps at specific distances. e. Explain with the help of formulae the expansion coefficients of liquid and gas.

Discussion

11.	Let the distance of reflecting surface from the sound source and observer be d and speed of sound in air be v, then the time of echo is:
Answer» Let the distance of reflecting surface from the sound source and observer be d and speed of sound in air be v, then the time of echo is:

Discussion

12.	A positively-charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. What is the direction of magnetic field?
Answer» A positively-charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. What is the direction of magnetic field?

Discussion

13.	A small current (i) carrying loop of radius r is placed on the axis of a large current (lo) carryingloop of radiusR Themagnetic force of interaction between loops when distance between their centre is d, is
Answer» A small current (i) carrying loop of radius r is placed on the axis of a large current (lo) carryingloop of radiusR Themagnetic force of interaction between loops when distance between their centre is d, is

Discussion

14.	The critical angle for water-glass surface is (refractive index of glass = 1.5 and refractive index of water = 4/3)
Answer» The critical angle for water-glass surface is (refractive index of glass = 1.5 and refractive index of water = 4/3)

Discussion

15.	27.A thin rod of length f/3 is placed along the optic axis of a concave mirror of focal length f such that the image which is real and elongated just touches the rod .what will be the magnification?
Answer» 27.A thin rod of length f/3 is placed along the optic axis of a concave mirror of focal length f such that the image which is real and elongated just touches the rod .what will be the magnification?

Discussion

16.	118.For concave and convex lens if object is real image can be real or virtual and if object is virtual image can be real or virtual.explain whether above statement is true or false.
Answer» 118.For concave and convex lens if object is real image can be real or virtual and if object is virtual image can be real or virtual.explain whether above statement is true or false.

Discussion

17.	What are fossils. How do studies of fossils support evidences for organic evolution.
Answer» What are fossils. How do studies of fossils support evidences for organic evolution.

Discussion

18.	In an experiment to trace the path of a ray of light passing through a rectangular glass slab, four students measured the angles of incidence (i), angles of refraction (r) and angles of emergence (e) as shown in the diagrams:The correct measurement is given in the diagram:(1) A(2) B(3) C(4) D
Answer» In an experiment to trace the path of a ray of light passing through a rectangular glass slab, four students measured the angles of incidence (i), angles of refraction (r) and angles of emergence (e) as shown in the diagrams: The correct measurement is given in the diagram: (1) A (2) B (3) C (4) D

Discussion

19.	23.A radio can tune in to any station in the 7.5 mhz to 12 mhz band what is the corresponding wavelength band ?
Answer» 23.A radio can tune in to any station in the 7.5 mhz to 12 mhz band what is the corresponding wavelength band ?

Discussion

20.	The centripetal force acting on a mass of m is 200 N, then___.(CPF - centripetal force, CFF - centrifugal force)
Answer» The centripetal force acting on a mass of $m$ is $200 N$ , then___.(CPF - centripetal force, CFF - centrifugal force)

Discussion

21.	73.What would be the beat frequency of 2 Hz 3 Hz 4 Hz
Answer» 73.What would be the beat frequency of 2 Hz 3 Hz 4 Hz

Discussion

22.	A luminous object is placed at a distance of 30cm from the convex lens of focal length 20 cm. On the other side of lens at what distance from the lens a convex mirror be placed of radius of curvature 10cm in order to have an image of the object coincident with it
Answer» A luminous object is placed at a distance of 30cm from the convex lens of focal length 20 cm. On the other side of lens at what distance from the lens a convex mirror be placed of radius of curvature 10cm in order to have an image of the object coincident with it

Discussion

23.	what is the relation between the van der waals forces and dipole dipole forces
Answer» what is the relation between the van der waals forces and dipole dipole forces

Discussion

24.	A straight horizontal copper wire has a current I=28 A flowing through it. What is the mimimum magnitude of magnetic field required to suspend the wire in air by balancing the gravitational force acting on it?Given: the linear density of wire is 46.6 g/m
Answer» A straight horizontal copper wire has a current $I = 28 A$ flowing through it. What is the mimimum magnitude of magnetic field required to suspend the wire in air by balancing the gravitational force acting on it? Given: the linear density of wire is $46.6 g/m$

Discussion

25.	From the circuit-diagram given below choose the correct options:-
Answer» From the circuit-diagram given below choose the correct options:-

25.

From the circuit-diagram given below choose the correct options:-

Answer»

From the circuit-diagram given below choose the correct options:-

Discussion

26.	If R is the radius of earth and g is the acceleration due to gravity on the earth's surface, then the mean density of earth is
Answer» If R is the radius of earth and g is the acceleration due to gravity on the earth's surface, then the mean density of earth is

Discussion

27.	The speed of a DC motor can be increased by increasing it's:
Answer» The speed of a DC motor can be increased by increasing it's:

Discussion

28.	One half of a convex lens of focal length 10 cm is covered with a black paper. Can such a lens produce an image of a complete object placed at a distance of 30 cm from the lens? Draw a ray diagram to justify your answer. A 4 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 20 cm. The distance of the object from the lens is 15 cm. Find the nature, position and size of the image.
Answer» One half of a convex lens of focal length 10 cm is covered with a black paper. Can such a lens produce an image of a complete object placed at a distance of 30 cm from the lens? Draw a ray diagram to justify your answer. A 4 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 20 cm. The distance of the object from the lens is 15 cm. Find the nature, position and size of the image.

Discussion

29.	How are Astronomical unit and light year related to each other?
Answer» How are Astronomical unit and light year related to each other?

Discussion

30.	One face of a 6 cm thick rectangular glass plate is silvered. An object held 8 cm in front of the unsilvered face forms an image 10 cm behind the silvered face. Find the critical angle for glass-air interface.[consider two refractions and one reflection]
Answer» One face of a $6 cm$ thick rectangular glass plate is silvered. An object held $8 cm$ in front of the unsilvered face forms an image $10 cm$ behind the silvered face. Find the critical angle for glass-air interface. [consider two refractions and one reflection]

Discussion

31.	Question 28 (ii)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. (ii) What happens to the reading of A1, A2 A3 and A when the bulb B2 gets fused?
Answer» Question 28 (ii) $B_{1}, B_{2}, a n d B_{3}$ 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. (ii) What happens to the reading of $A_{1}, A_{2} A_{3}$ and A when the bulb $B_{2}$ gets fused?

Discussion

32.	Which of the following is false regarding space stations?
Answer» Which of the following is false regarding space stations?

Discussion

33.	Coulomb/sec is also equal to
Answer» Coulomb/sec is also equal to

Discussion

34.	The escape velocity on the surface of the earth is va- If M and R are the mass and radius of the earth, respectively, then the escape velocity on another planet of mass 2 M and radius R will be
Answer» The escape velocity on the surface of the earth is va- If M and R are the mass and radius of the earth, respectively, then the escape velocity on another planet of mass 2 M and radius R will be

Discussion

35.	why work is a not vector as force and displacement are vector
Answer» why work is a not vector as force and displacement are vector

Discussion

36.	Mechanism of forceful inspiration?
Answer» Mechanism of forceful inspiration?

Discussion

37.	Give two reasons why nichrome alloy is used for making the heating elements of electrical applicances.
Answer» Give two reasons why nichrome alloy is used for making the heating elements of electrical applicances.

Discussion

38.	Why closed loop integration is taken for axis of ring?
Answer» Why closed loop integration is taken for axis of ring?

Discussion

39.	Write the full form of OTE.
Answer» Write the full form of OTE.

Discussion

40.	A liquid enclosed in 1.0L flask at 298K. The vapour pressure exerted by the liquid is 20.0 mm. when the same liquid is enclosed in a flask of 5L capacity at the same temperature, the vapour pressure of the liquid will be:
Answer» A liquid enclosed in 1.0L flask at 298K. The vapour pressure exerted by the liquid is 20.0 mm. when the same liquid is enclosed in a flask of 5L capacity at the same temperature, the vapour pressure of the liquid will be:

Discussion

41.	Latent heat of vapourisation of liquid at 500k and 1 atm is 10kcal/mol.What will be the change in internal energy of 3 mol of liquid at same temperatur and presure
Answer» Latent heat of vapourisation of liquid at 500k and 1 atm is 10kcal/mol.What will be the change in internal energy of 3 mol of liquid at same temperatur and presure

Discussion

42.	Observe the optical systems above. Given that all surfaces are made of transparent glass and the dotted surfaces represent plane surface. Which among them can be considered as lenses?
Answer» Observe the optical systems above. Given that all surfaces are made of transparent glass and the dotted surfaces represent plane surface. Which among them can be considered as lenses?

42.

Observe the optical systems above. Given that all surfaces are made of transparent glass and the dotted surfaces represent plane surface. Which among them can be considered as lenses?

Answer»

Observe the optical systems above. Given that all surfaces are made of transparent glass and the dotted surfaces represent plane surface. Which among them can be considered as lenses?

Discussion

43.	Which of the following is an optical-aid used by visually challenged persons to develop their capabilities?
Answer» Which of the following is an optical-aid used by visually challenged persons to develop their capabilities?

Discussion

44.	Astigmatic eye has problem in viewing images uniformly on which lines?
Answer» Astigmatic eye has problem in viewing images uniformly on which lines?

Discussion

45.	Find the angle of minimum deviation produced by an equilateral prism of refractive index 1.55. Also find the angle of minimum deviation when the prism is completely immersed in water
Answer» Find the angle of minimum deviation produced by an equilateral prism of refractive index 1.55. Also find the angle of minimum deviation when the prism is completely immersed in water

Discussion

46.	Ionisation energy of Li atom in ground state is 5.4 eV.Binding energy of an electron in Li+ Ion in ground state is 75.6 eV.Energy required to remove all three electrons of Li atom is
Answer» Ionisation energy of Li atom in ground state is 5.4 eV.Binding energy of an electron in Li+ Ion in ground state is 75.6 eV.Energy required to remove all three electrons of Li atom is

Discussion

47.	A football match is being played at night in a stadium with flood lights ON. You can see the shadow of a football kept at the ground but cannot see its shadow when it is kicked high in the air. Explain.
Answer» A football match is being played at night in a stadium with flood lights ON. You can see the shadow of a football kept at the ground but cannot see its shadow when it is kicked high in the air. Explain.

Discussion

48.	what is the formula of Angular width for Diffraction
Answer» what is the formula of Angular width for Diffraction

Discussion

49.	Statement 1: Ram is standing at a distance of 33 m from a wall. He claps and hears the echo of his own clap. Statement 2: Velocity of sound in air is 330 ms and time of persistence for hearing is 110 of a second.
Answer» Statement 1: Ram is standing at a distance of 33 m from a wall. He claps and hears the echo of his own clap. Statement 2: Velocity of sound in air is 330 $\frac{m}{s}$ and time of persistence for hearing is $\frac{1}{10}$ of a second.

49.

Statement 1: Ram is standing at a distance of 33 m from a wall. He claps and hears the echo of his own clap. Statement 2: Velocity of sound in air is 330 ms and time of persistence for hearing is 110 of a second.

Answer»

Statement 1: Ram is standing at a distance of 33 m from a wall. He claps and hears the echo of his own clap.

Statement 2: Velocity of sound in air is 330 $\frac{m}{s}$ and time of persistence for hearing is $\frac{1}{10}$ of a second.

Discussion

50.	A convex lens of 10 cm focal length is joined with a concave lens of 6 cm focal length. Find the focal length of the combination.
Answer» A convex lens of $10 cm$ focal length is joined with a concave lens of $6 cm$ focal length. Find the focal length of the combination.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

41.The distance of a particle moving on a circle of radius 12m measured from a fixed point on the circle and measured along the circle is given by s=2t³(in meters).The ratio of its tangential to centripetal acceleration at t=2s is ?

A ray of light travelling in a medium of refractive index 1.8 enters into a medium with refractive index 1.5. Then the speed of light in the rarer medium will (1)Increase by a factor of 1.5 (2)Decrease (3)Remain same (4)Increase by a factor of 1.2

Question 2 In the following circuits (Figure), heat produced in the resistor or combination of resistors connected to a 12V battery will be (a) same in all the cases (b) minimum in case (i) (c) maximum in case (ii) (d) maximum in case (iii)

Two objects have equal momentum but masses in the ratio 3:2. Calculate the ratio of their velocities.

A generating station having n-section busbars each rated at 8 kVA with x% reactance is connected on the tie-bars system through busbar reactance of b%. If n is very large and a three phase fault takes place on one section then the short circuit kVA is

Select from the following the best set-up for tracing the path of a ray of light through a rectangular glass slab:

An electrical appliance has a rating of 4.5 kW−220 V. Which of the following could be the current rating of the fuse (in A) to be used with the appliance?

What is water shed management ? List any two advantages to it ?

Let the distance of reflecting surface from the sound source and observer be d and speed of sound in air be v, then the time of echo is:

A positively-charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. What is the direction of magnetic field?

A small current (i) carrying loop of radius r is placed on the axis of a large current (lo) carryingloop of radiusR Themagnetic force of interaction between loops when distance between their centre is d, is

The critical angle for water-glass surface is (refractive index of glass = 1.5 and refractive index of water = 4/3)

27.A thin rod of length f/3 is placed along the optic axis of a concave mirror of focal length f such that the image which is real and elongated just touches the rod .what will be the magnification?

118.For concave and convex lens if object is real image can be real or virtual and if object is virtual image can be real or virtual.explain whether above statement is true or false.

What are fossils. How do studies of fossils support evidences for organic evolution.

In an experiment to trace the path of a ray of light passing through a rectangular glass slab, four students measured the angles of incidence (i), angles of refraction (r) and angles of emergence (e) as shown in the diagrams:The correct measurement is given in the diagram:(1) A(2) B(3) C(4) D

23.A radio can tune in to any station in the 7.5 mhz to 12 mhz band what is the corresponding wavelength band ?

The centripetal force acting on a mass of m is 200 N, then___.(CPF - centripetal force, CFF - centrifugal force)

73.What would be the beat frequency of 2 Hz 3 Hz 4 Hz

A luminous object is placed at a distance of 30cm from the convex lens of focal length 20 cm. On the other side of lens at what distance from the lens a convex mirror be placed of radius of curvature 10cm in order to have an image of the object coincident with it

what is the relation between the van der waals forces and dipole dipole forces

A straight horizontal copper wire has a current I=28 A flowing through it. What is the mimimum magnitude of magnetic field required to suspend the wire in air by balancing the gravitational force acting on it?Given: the linear density of wire is 46.6 g/m

From the circuit-diagram given below choose the correct options:-

If R is the radius of earth and g is the acceleration due to gravity on the earth's surface, then the mean density of earth is

The speed of a DC motor can be increased by increasing it's:

How are Astronomical unit and light year related to each other?

One face of a 6 cm thick rectangular glass plate is silvered. An object held 8 cm in front of the unsilvered face forms an image 10 cm behind the silvered face. Find the critical angle for glass-air interface.[consider two refractions and one reflection]

Question 28 (ii)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. (ii) What happens to the reading of A1, A2 A3 and A when the bulb B2 gets fused?

Which of the following is false regarding space stations?

Coulomb/sec is also equal to

The escape velocity on the surface of the earth is va- If M and R are the mass and radius of the earth, respectively, then the escape velocity on another planet of mass 2 M and radius R will be

why work is a not vector as force and displacement are vector

Mechanism of forceful inspiration?

Give two reasons why nichrome alloy is used for making the heating elements of electrical applicances.

Why closed loop integration is taken for axis of ring?

Write the full form of OTE.

A liquid enclosed in 1.0L flask at 298K. The vapour pressure exerted by the liquid is 20.0 mm. when the same liquid is enclosed in a flask of 5L capacity at the same temperature, the vapour pressure of the liquid will be:

Latent heat of vapourisation of liquid at 500k and 1 atm is 10kcal/mol.What will be the change in internal energy of 3 mol of liquid at same temperatur and presure

Observe the optical systems above. Given that all surfaces are made of transparent glass and the dotted surfaces represent plane surface. Which among them can be considered as lenses?

Which of the following is an optical-aid used by visually challenged persons to develop their capabilities?

Astigmatic eye has problem in viewing images uniformly on which lines?

Find the angle of minimum deviation produced by an equilateral prism of refractive index 1.55. Also find the angle of minimum deviation when the prism is completely immersed in water

Ionisation energy of Li atom in ground state is 5.4 eV.Binding energy of an electron in Li+ Ion in ground state is 75.6 eV.Energy required to remove all three electrons of Li atom is

A football match is being played at night in a stadium with flood lights ON. You can see the shadow of a football kept at the ground but cannot see its shadow when it is kicked high in the air. Explain.

what is the formula of Angular width for Diffraction

Statement 1: Ram is standing at a distance of 33 m from a wall. He claps and hears the echo of his own clap. Statement 2: Velocity of sound in air is 330 ms and time of persistence for hearing is 110 of a second.

A convex lens of 10 cm focal length is joined with a concave lens of 6 cm focal length. Find the focal length of the combination.