16569 + Interview Questions in Physics

1.	The splitting of white light into seven colours is known as ___.
Answer» The splitting of white light into seven colours is known as ___.

Discussion

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

Discussion

3.	The given figure shows a block and tackle system of pulleys used to lift a load. When the load is pulled up by a distance 1 m, how far does the effort end moves?
Answer» The given figure shows a block and tackle system of pulleys used to lift a load. When the load is pulled up by a distance 1 m, how far does the effort end moves?

3.

The given figure shows a block and tackle system of pulleys used to lift a load. When the load is pulled up by a distance 1 m, how far does the effort end moves?

Answer»

The given figure shows a block and tackle system of pulleys used to lift a load. When the load is pulled up by a distance 1 m, how far does the effort end moves?

Discussion

4.	Complete the sentences and explain them.a. The minimum distance between the start and finish points of the motion of an object is called the ........... of the object.b. Deceleration is -------- acceleration.c. When an object is in uniform circular motion, its ......... changes at every point.d. During collision ........... remains constant.e. The working of a rocket depends on Newton’s ........ law of motion.
Answer» Complete the sentences and explain them. a. The minimum distance between the start and finish points of the motion of an object is called the ........... of the object. b. Deceleration is -------- acceleration. c. When an object is in uniform circular motion, its ......... changes at every point. d. During collision ........... remains constant. e. The working of a rocket depends on Newton’s ........ law of motion.

Discussion

5.	With respect to air, the refractive index of a flint glass and alcohol is 1.65 and 1.36 respectively. Calculate the refractive index of the flint glass with respect to alcohol.1.21
Answer» With respect to air, the refractive index of a flint glass and alcohol is $1.65$ and $1.36$ respectively. Calculate the refractive index of the flint glass with respect to alcohol. 1.21

Discussion

6.	Two wires of same length and different resisitivites and different cross section areas are joined in series. Find eq resistivity
Answer» Two wires of same length and different resisitivites and different cross section areas are joined in series. Find eq resistivity

Discussion

7.	A current i flows along the length of an infinite long, straight, thin walled pipe, then:-(1) the magnetic field at all points inside the pipe is same but not zero (2) the magnetic field at any point inside the pipe is zero (3) the magnetic field is zero only on the axis of the pipe. (4) the magnetic field is different at different points inside the pipe.
Answer» A current i flows along the length of an infinite long, straight, thin walled pipe, then:-(1) the magnetic field at all points inside the pipe is same but not zero (2) the magnetic field at any point inside the pipe is zero (3) the magnetic field is zero only on the axis of the pipe. (4) the magnetic field is different at different points inside the pipe.

Discussion

8.	Q.1059 A concave mirror of focal length f1 is placed at a distance d from a convex lens of focal length f2. A beam of light coming from infinity and falling on this convex lens-concave mirror combination returms to infinity. The distance d must equal:
Answer» Q.1059 A concave mirror of focal length f1 is placed at a distance d from a convex lens of focal length f2. A beam of light coming from infinity and falling on this convex lens-concave mirror combination returms to infinity. The distance d must equal:

Discussion

9.	The potential difference across the terminals of a battery is 50 V, when 11 A are drawn and 60 V when 1 A is drawn. The emf and the internal resistance of the battery are
Answer» The potential difference across the terminals of a battery is $50 V,$ when $11 A$ are drawn and $60 V$ when $1 A$ is drawn. The emf and the internal resistance of the battery are

Discussion

10.	The power obtained in a reactor using U^235 disintegration is 1000KW the mass decay of U^235 per hour is
Answer» The power obtained in a reactor using U^235 disintegration is 1000KW the mass decay of U^235 per hour is

Discussion

11.	Question 15 (a)State the rule to determine the direction of a(i) magnetic field produced around a straight conductor-carrying current.
Answer» Question 15 (a) State the rule to determine the direction of a (i) magnetic field produced around a straight conductor-carrying current.

Discussion

12.	Question 16Which uses more energy, a 250 W TV set in 1 h, or a 1200 W toaster in 10 minutes?
Answer» Question 16 Which uses more energy, a 250 W TV set in 1 h, or a 1200 W toaster in 10 minutes?

Discussion

13.	Which effect of current is utilised in an electric light bulb?
Answer» Which effect of current is utilised in an electric light bulb?

Discussion

14.	In an experiment, values of two resistances are measured to be r1=5.0±0.2 ohm and r2=10.0±0.1 ohm. Find the values of total resistance in (1) series. (2) parallel, with limits of percentage error.
Answer» In an experiment, values of two resistances are measured to be r1=5.0±0.2 ohm and r2=10.0±0.1 ohm. Find the values of total resistance in (1) series. (2) parallel, with limits of percentage error.

Discussion

15.	Derivation of formula of resistor connected in series and parallel
Answer» Derivation of formula of resistor connected in series and parallel

Discussion

16.	Consider the circuits given below: (a)In which circuit are the lamps dimmest? (b) In which circuit or circuits are the lamps of equal brightness to the lamps in the circuit? (c) Which circuit gives out the maximum light?
Answer» Consider the circuits given below: (a)In which circuit are the lamps dimmest? (b) In which circuit or circuits are the lamps of equal brightness to the lamps in the circuit? (c) Which circuit gives out the maximum light?

16.

Consider the circuits given below: (a)In which circuit are the lamps dimmest? (b) In which circuit or circuits are the lamps of equal brightness to the lamps in the circuit? (c) Which circuit gives out the maximum light?

Answer»

Consider the circuits given below:

(a)In which circuit are the lamps dimmest?
(b) In which circuit or circuits are the lamps of equal brightness to the lamps in the circuit?
(c) Which circuit gives out the maximum light?

Discussion

17.	6 Calculate the wavelength of X rays which produce a different angle 2 theta equal to 16.80 degrees for a crystal. assume first order diffraction with interparticle distance in crystal of 0.2nm.
Answer» 6 Calculate the wavelength of X rays which produce a different angle 2 theta equal to 16.80 degrees for a crystal. assume first order diffraction with interparticle distance in crystal of 0.2nm.

Discussion

18.	In sun glasses, both of its surface are curved, yet their behaviour is neither like a convex lens nor like a concave lens. State the reason.
Answer» In sun glasses, both of its surface are curved, yet their behaviour is neither like a convex lens nor like a concave lens. State the reason.

Discussion

19.	A body of mass 10 kg is moving on a circular track of radius 15 m. What is work done by the centripetal force on it in one complete revolution? (Take g = 10 m/s2)
Answer» A body of mass 10 kg is moving on a circular track of radius 15 m. What is work done by the centripetal force on it in one complete revolution? (Take g = $10 m / s^{2}$ )

Discussion

20.	Explain why, natural gas is considered to be a good fuel.
Answer» Explain why, natural gas is considered to be a good fuel.

Discussion

21.	Which type of lens always forms a virtual image? [2 MARKS]
Answer» Which type of lens always forms a virtual image? [2 MARKS]

Discussion

22.	Why there is zero at the centre of the earth of any object
Answer» Why there is zero at the centre of the earth of any object

Discussion

23.	A current of 2 amperes (2A) flows through a conductor of resistance 20Ω for 5 minutes. Calculate the amount of heat produced in KJ.
Answer» A current of 2 amperes (2A) flows through a conductor of resistance $20 Ω$ for 5 minutes. Calculate the amount of heat produced in KJ.

Discussion

24.	The above diagram is the arrangement for observing scattering of light in colloidal solution, why does the beaker appears orange red when seen through the slit MN ?
Answer» The above diagram is the arrangement for observing scattering of light in colloidal solution, why does the beaker appears orange red when seen through the slit MN ?

24.

The above diagram is the arrangement for observing scattering of light in colloidal solution, why does the beaker appears orange red when seen through the slit MN ?

Answer»

The above diagram is the arrangement for observing scattering of light in colloidal solution, why does the beaker appears orange red when seen through the slit MN ?

Discussion

25.	What is the force applied in projectile motion?
Answer» What is the force applied in projectile motion?

Discussion

26.	Which of the following is a hydrophilic sol?
Answer» Which of the following is a hydrophilic sol?

Discussion

27.	Calculate the force on an electric current in a field of1500n/c. Take the charge of an electronic to be 1.6multiplyed by 10to the power6
Answer» Calculate the force on an electric current in a field of1500n/c. Take the charge of an electronic to be 1.6multiplyed by 10to the power6

Discussion

28.	Consider the following statements. Statement 1: The HST design with two parabolic mirrors is known for good imaging performance over a wide field of view. Statement 2: Hubble’s Ultra Deep Field image is the most detailed visible-light image ever made of the universe’s most distant object.
Answer» Consider the following statements. Statement 1: The HST design with two parabolic mirrors is known for good imaging performance over a wide field of view. Statement 2: Hubble’s Ultra Deep Field image is the most detailed visible-light image ever made of the universe’s most distant object.

28.

Consider the following statements. Statement 1: The HST design with two parabolic mirrors is known for good imaging performance over a wide field of view. Statement 2: Hubble’s Ultra Deep Field image is the most detailed visible-light image ever made of the universe’s most distant object.

Answer»

Consider the following statements.

Statement 1: The HST design with two parabolic mirrors is known for good imaging performance over a wide field of view.

Statement 2: Hubble’s Ultra Deep Field image is the most detailed visible-light image ever made of the universe’s most distant object.

Discussion

29.	Solve:(1) The speed of light in a transparent medium is 2.4 × 108 m/s. Calculate absolute refractive index of the medium.(2) The speed of light in water and glass is 2.2 × 108 m/s and 2 × 108 m/s, respectively. What is the refractive index of −(a) water w.r.t. glass(b) glass w.r.t. water.(3) Refractive index of water is 4/3 and speed of light in air is 3×108 m/s. Find speed of light in water.
Answer» Solve: (1) The speed of light in a transparent medium is 2.4 × 10⁸ m/s. Calculate absolute refractive index of the medium. (2) The speed of light in water and glass is 2.2 × 10⁸ m/s and 2 × 10⁸ m/s, respectively. What is the refractive index of − (a) water w.r.t. glass (b) glass w.r.t. water. (3) Refractive index of water is 4/3 and speed of light in air is 3×10⁸ m/s. Find speed of light in water.

29.

Solve:(1) The speed of light in a transparent medium is 2.4 × 108 m/s. Calculate absolute refractive index of the medium.(2) The speed of light in water and glass is 2.2 × 108 m/s and 2 × 108 m/s, respectively. What is the refractive index of −(a) water w.r.t. glass(b) glass w.r.t. water.(3) Refractive index of water is 4/3 and speed of light in air is 3×108 m/s. Find speed of light in water.

Answer»

Solve:

(1) The speed of light in a transparent medium is 2.4 × 10⁸ m/s. Calculate absolute refractive index of the medium.

(2) The speed of light in water and glass is 2.2 × 10⁸ m/s and 2 × 10⁸ m/s, respectively. What is the refractive index of −

(a) water w.r.t. glass

(b) glass w.r.t. water.

(3) Refractive index of water is 4/3 and speed of light in air is 3×10⁸ m/s. Find speed of light in water.

Discussion

30.	6 resistors each having the same resistance are connected in parallel. Their equivalent resistance is 6 ohm. When they are connected in series their equivalent resistance is how much?
Answer» 6 resistors each having the same resistance are connected in parallel. Their equivalent resistance is 6 ohm. When they are connected in series their equivalent resistance is how much?

Discussion

31.	The heat released by a copper ball of mass 1 kg when cooled from 100°C to 90°C is 8.4 kJ. Calculate the specific heat capacity of copper.
Answer» The heat released by a copper ball of mass 1 kg when cooled from 100°C to 90°C is 8.4 kJ. Calculate the specific heat capacity of copper.

Discussion

32.	100) A plane mirror is placed along the x-axis facing negative y-axis.The mirror is fixed. A pointy object is moving with 3i+ 4j in front of the plane mirror. The relative velocity of image with respect to its object is? (a) -8j(b) 8j(c) 3i-4j(d) -6
Answer» 100) A plane mirror is placed along the x-axis facing negative y-axis.The mirror is fixed. A pointy object is moving with 3i+ 4j in front of the plane mirror. The relative velocity of image with respect to its object is? (a) -8j(b) 8j(c) 3i-4j(d) -6

Discussion

33.	motion
Answer» motion

Discussion

34.	In fig shows a thin beam of white light from a source S striking on one face of a prism. (a) Complete the diagram to show the effect of prism on the beam and to show what is seen on the screen. (b) If a slit is placed in between the prism and the screen to pass only the light of green colour, what will you then observe on the screen ? (c) What conclusion do you draw from the observation in part (b) above ?
Answer» In fig shows a thin beam of white light from a source S striking on one face of a prism. (a) Complete the diagram to show the effect of prism on the beam and to show what is seen on the screen. (b) If a slit is placed in between the prism and the screen to pass only the light of green colour, what will you then observe on the screen ? (c) What conclusion do you draw from the observation in part (b) above ?

34.

In fig shows a thin beam of white light from a source S striking on one face of a prism. (a) Complete the diagram to show the effect of prism on the beam and to show what is seen on the screen. (b) If a slit is placed in between the prism and the screen to pass only the light of green colour, what will you then observe on the screen ? (c) What conclusion do you draw from the observation in part (b) above ?

Answer»

In fig shows a thin beam of white light from a source S striking on one face of a prism.

(a) Complete the diagram to show the effect of prism on the beam and to show what is seen on the screen.

(b) If a slit is placed in between the prism and the screen to pass only the light of green colour, what will you then observe on the screen ?

(c) What conclusion do you draw from the observation in part (b) above ?

Discussion

35.	What is the farthest distance you can see if you have a normal eye?
Answer» What is the farthest distance you can see if you have a normal eye?

Discussion

36.	How much energy is realesed in Uranium 235 fission reaction?
Answer» How much energy is realesed in Uranium 235 fission reaction?

Discussion

37.	The internal resistance of a cell is the resistance of (1)Electrolytes used in cell (2)Electrodes of the cell(3)Both (a) and (b) (4)None of these
Answer» The internal resistance of a cell is the resistance of (1)Electrolytes used in cell (2)Electrodes of the cell (3)Both (a) and (b) (4)None of these

Discussion

38.	what is formula for resolving power (or limit of resolution) for microscopes and telescopes ?
Answer» what is formula for resolving power (or limit of resolution) for microscopes and telescopes ?

Discussion

39.	A ray of light from a denser medium strikes a rare medium at angle of incidence i as shown in the figure. The reflected and refracted rays make an angle of 90°with each other. The angles of reflection and refraction are r and r'. The critical angle between them is (a) sin^-1(tanr) (b) sin^-1(tani) (c) sin^-1(tanr') (d) tan^-1(tani) (The figure has an incident ray , a reflected ray , a normal and a refracted ray all lying at the point of incidence and an angle of 90 degree btw reflected and refracted ray) *(Sir/madam please send a detailed answer along with the explanation of the QUESTION)
Answer» A ray of light from a denser medium strikes a rare medium at angle of incidence i as shown in the figure. The reflected and refracted rays make an angle of 90°with each other. The angles of reflection and refraction are r and r'. The critical angle between them is (a) sin^-1(tanr) (b) sin^-1(tani) (c) sin^-1(tanr') (d) tan^-1(tani) (The figure has an incident ray , a reflected ray , a normal and a refracted ray all lying at the point of incidence and an angle of 90 degree btw reflected and refracted ray) *(Sir/madam please send a detailed answer along with the explanation of the QUESTION)

Discussion

40.	A magnifying glass is to be used at the fixed object distance of 1 inch.If it is to produce an erect image 5 items magnified, its focal length should be :(A) 0.2"(B) 0.8"(C)1.5"(D) 5"
Answer» A magnifying glass is to be used at the fixed object distance of 1 inch.If it is to produce an erect image 5 items magnified, its focal length should be :(A) 0.2"(B) 0.8"(C)1.5"(D) 5"

Discussion

41.	(a) Define (i) principal focus of a concave mirror, and (ii) focal length of a concave mirror. (b) Draw diagram to represent the action of a concave mirror on a beam of parallel light rays. Mark on this diagram principal axis, focus F, centre of curvature C, pole P and focal length f, of the concave mirror.
Answer» (a) Define (i) principal focus of a concave mirror, and (ii) focal length of a concave mirror. (b) Draw diagram to represent the action of a concave mirror on a beam of parallel light rays. Mark on this diagram principal axis, focus F, centre of curvature C, pole P and focal length f, of the concave mirror.

41.

(a) Define (i) principal focus of a concave mirror, and (ii) focal length of a concave mirror. (b) Draw diagram to represent the action of a concave mirror on a beam of parallel light rays. Mark on this diagram principal axis, focus F, centre of curvature C, pole P and focal length f, of the concave mirror.

Answer»

(a) Define (i) principal focus of a concave mirror, and (ii) focal length of a concave mirror.

(b) Draw diagram to represent the action of a concave mirror on a beam of parallel light rays. Mark on this diagram principal axis, focus F, centre of curvature C, pole P and focal length f, of the concave mirror.

Discussion

42.	How decide convention of g,h,u in the problems of motion under gravity?
Answer» How decide convention of g,h,u in the problems of motion under gravity?

Discussion

43.	Explain different types of binary fisson?
Answer» Explain different types of binary fisson?

Discussion

44.	How to take second derivative
Answer» How to take second derivative

Discussion

45.	What are reversible and irreversible changes? Give one example for each.
Answer» What are reversible and irreversible changes? Give one example for each.

Discussion

46.	23.A coil of self inductance 50 H is joined to theterminals of a battery of e.m.f. 2 V throughresistance of 10 2 and a steady current is flowingthrough the circuit. If the battery is nowdisconnected then time in which the current will1of its steady value isedecay to(2) 50 s(1) 500 s(4) 0.5 s(3) 5s(3)
Answer» 23.A coil of self inductance 50 H is joined to theterminals of a battery of e.m.f. 2 V throughresistance of 10 2 and a steady current is flowingthrough the circuit. If the battery is nowdisconnected then time in which the current will1of its steady value isedecay to(2) 50 s(1) 500 s(4) 0.5 s(3) 5s(3)

Discussion

47.	48. A woman who is a carrier for haemophilia married Aman who is both colourblind and haemophilia what is the percentage of children affected by both diseases
Answer» 48. A woman who is a carrier for haemophilia married Aman who is both colourblind and haemophilia what is the percentage of children affected by both diseases

Discussion

48.	To measure the potential difference across a resistance R a voltmeter of resistance R' is used .To measure the potential difference with a minimum accuracy of 95% , R' is related with R as (assume sorce current does not change)
Answer» To measure the potential difference across a resistance R a voltmeter of resistance R' is used .To measure the potential difference with a minimum accuracy of 95% , R' is related with R as (assume sorce current does not change)

Discussion

49.	A ray of light is incident normally on one face of an equilateral glass prism. Answer the following: a) What is the angle of incidence on the first face of the prism? b) What is the angle of refraction from the first face of the prism? c) What will be the angle of incidence at the second face of the prism?
Answer» A ray of light is incident normally on one face of an equilateral glass prism. Answer the following: a) What is the angle of incidence on the first face of the prism? b) What is the angle of refraction from the first face of the prism? c) What will be the angle of incidence at the second face of the prism?

Discussion

50.	What is the value of induced current if there is steady current in coil second????
Answer» What is the value of induced current if there is steady current in coil second????

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The splitting of white light into seven colours is known as ___.

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

The given figure shows a block and tackle system of pulleys used to lift a load. When the load is pulled up by a distance 1 m, how far does the effort end moves?

With respect to air, the refractive index of a flint glass and alcohol is 1.65 and 1.36 respectively. Calculate the refractive index of the flint glass with respect to alcohol.1.21

Two wires of same length and different resisitivites and different cross section areas are joined in series. Find eq resistivity

Q.1059 A concave mirror of focal length f1 is placed at a distance d from a convex lens of focal length f2. A beam of light coming from infinity and falling on this convex lens-concave mirror combination returms to infinity. The distance d must equal:

The potential difference across the terminals of a battery is 50 V, when 11 A are drawn and 60 V when 1 A is drawn. The emf and the internal resistance of the battery are

The power obtained in a reactor using U^235 disintegration is 1000KW the mass decay of U^235 per hour is

Question 15 (a)State the rule to determine the direction of a(i) magnetic field produced around a straight conductor-carrying current.

Question 16Which uses more energy, a 250 W TV set in 1 h, or a 1200 W toaster in 10 minutes?

Which effect of current is utilised in an electric light bulb?

In an experiment, values of two resistances are measured to be r1=5.0±0.2 ohm and r2=10.0±0.1 ohm. Find the values of total resistance in (1) series. (2) parallel, with limits of percentage error.

Derivation of formula of resistor connected in series and parallel

Consider the circuits given below: (a)In which circuit are the lamps dimmest? (b) In which circuit or circuits are the lamps of equal brightness to the lamps in the circuit? (c) Which circuit gives out the maximum light?

6 Calculate the wavelength of X rays which produce a different angle 2 theta equal to 16.80 degrees for a crystal. assume first order diffraction with interparticle distance in crystal of 0.2nm.

In sun glasses, both of its surface are curved, yet their behaviour is neither like a convex lens nor like a concave lens. State the reason.

A body of mass 10 kg is moving on a circular track of radius 15 m. What is work done by the centripetal force on it in one complete revolution? (Take g = 10 m/s2)

Explain why, natural gas is considered to be a good fuel.

Which type of lens always forms a virtual image? [2 MARKS]

Why there is zero at the centre of the earth of any object

A current of 2 amperes (2A) flows through a conductor of resistance 20Ω for 5 minutes. Calculate the amount of heat produced in KJ.

The above diagram is the arrangement for observing scattering of light in colloidal solution, why does the beaker appears orange red when seen through the slit MN ?

What is the force applied in projectile motion?

Which of the following is a hydrophilic sol?

Calculate the force on an electric current in a field of1500n/c. Take the charge of an electronic to be 1.6multiplyed by 10to the power6

Consider the following statements. Statement 1: The HST design with two parabolic mirrors is known for good imaging performance over a wide field of view. Statement 2: Hubble’s Ultra Deep Field image is the most detailed visible-light image ever made of the universe’s most distant object.

6 resistors each having the same resistance are connected in parallel. Their equivalent resistance is 6 ohm. When they are connected in series their equivalent resistance is how much?

The heat released by a copper ball of mass 1 kg when cooled from 100°C to 90°C is 8.4 kJ. Calculate the specific heat capacity of copper.

100) A plane mirror is placed along the x-axis facing negative y-axis.The mirror is fixed. A pointy object is moving with 3i+ 4j in front of the plane mirror. The relative velocity of image with respect to its object is? (a) -8j(b) 8j(c) 3i-4j(d) -6

motion

What is the farthest distance you can see if you have a normal eye?

How much energy is realesed in Uranium 235 fission reaction?

The internal resistance of a cell is the resistance of (1)Electrolytes used in cell (2)Electrodes of the cell(3)Both (a) and (b) (4)None of these

what is formula for resolving power (or limit of resolution) for microscopes and telescopes ?

A magnifying glass is to be used at the fixed object distance of 1 inch.If it is to produce an erect image 5 items magnified, its focal length should be :(A) 0.2"(B) 0.8"(C)1.5"(D) 5"

How decide convention of g,h,u in the problems of motion under gravity?

Explain different types of binary fisson?

How to take second derivative

What are reversible and irreversible changes? Give one example for each.

48. A woman who is a carrier for haemophilia married Aman who is both colourblind and haemophilia what is the percentage of children affected by both diseases

To measure the potential difference across a resistance R a voltmeter of resistance R' is used .To measure the potential difference with a minimum accuracy of 95% , R' is related with R as (assume sorce current does not change)

What is the value of induced current if there is steady current in coil second????