16569 + Interview Questions in Physics

1.	Which of the following is not a similarity between a current carrying solenoid and a bar magnet?
Answer» Which of the following is not a similarity between a current carrying solenoid and a bar magnet?

1.

Which of the following is not a similarity between a current carrying solenoid and a bar magnet?

Answer»

Which of the following is not a similarity between a current carrying solenoid and a bar magnet?

2.	A, B and C are three forces each of magnitude 4 N acting in the plane of paper as shown in fig. Which force has the least moment about O and which force has the greatest moment about O?
Answer» A, B and C are three forces each of magnitude 4 N acting in the plane of paper as shown in fig. Which force has the least moment about O and which force has the greatest moment about O?

2.

A, B and C are three forces each of magnitude 4 N acting in the plane of paper as shown in fig. Which force has the least moment about O and which force has the greatest moment about O?

Answer»

A, B and C are three forces each of magnitude 4 N acting in the plane of paper as shown in fig. Which force has the least moment about O and which force has the greatest moment about O?

Discussion

3.	If the focal length of a spherical mirror is 12.5 cm, its radius of curvature will be : (a) 25 cm (b) 15 cm (c) 20 cm (d) 35 cm
Answer» If the focal length of a spherical mirror is 12.5 cm, its radius of curvature will be : (a) 25 cm (b) 15 cm (c) 20 cm (d) 35 cm

Discussion

4.	How are the e.m.f. in the primary and secondary coils of a transformer related to the number of turns in these coils?
Answer» How are the e.m.f. in the primary and secondary coils of a transformer related to the number of turns in these coils?

Discussion

5.	When does light not go in a straight line?
Answer» When does light not go in a straight line?

Discussion

6.	How to take sign conversions while doing problems with spherical mirrors?
Answer» How to take sign conversions while doing problems with spherical mirrors?

Discussion

7.	(a) Arrange the following radiations in the order of their increasing wavelength : X rays, infrared rays, radio waves, gamma rays, and micro waves. (b) Name the radiation which is used for satellite communication.
Answer» (a) Arrange the following radiations in the order of their increasing wavelength : X rays, infrared rays, radio waves, gamma rays, and micro waves. (b) Name the radiation which is used for satellite communication.

7.

(a) Arrange the following radiations in the order of their increasing wavelength : X rays, infrared rays, radio waves, gamma rays, and micro waves. (b) Name the radiation which is used for satellite communication.

Answer»

(a) Arrange the following radiations in the order of their increasing wavelength :

X rays, infrared rays, radio waves, gamma rays, and micro waves.

(b) Name the radiation which is used for satellite communication.

Discussion

8.	(a) How many milliamperes are there in 1 ampere? (b) How many microamperes are there in 1 ampere?
Answer» (a) How many milliamperes are there in 1 ampere? (b) How many microamperes are there in 1 ampere?

Discussion

9.	Transformers works on mutual induction due to which magnetic field are generated .lf we will bring a magnetic needle near transformer will there be any deflection in the needle?
Answer» Transformers works on mutual induction due to which magnetic field are generated .lf we will bring a magnetic needle near transformer will there be any deflection in the needle?

Discussion

10.	Why is ammeter likely to burn when connected in parallel in the circuit?
Answer» Why is ammeter likely to burn when connected in parallel in the circuit?

Discussion

11.	What measures would you suggest to minimize environmental pollution caused by burning of fossil.
Answer» What measures would you suggest to minimize environmental pollution caused by burning of fossil.

Discussion

12.	Can't we use concavo-convex or convexo-concave instead of bifocal lens for presbyopia patient?
Answer» Can't we use concavo-convex or convexo-concave instead of bifocal lens for presbyopia patient?

Discussion

13.	Disadvantages of series connection ?
Answer» Disadvantages of series connection ?

Discussion

14.	A cell supplies a current of 1.2 A through two rsistors each of 2Ω connected in parallel. When the resistors are connected in series, it supplies a current of 0.4 A. Calculate: i) the internal resistance, and (ii) e.m.f. of the cell.
Answer» A cell supplies a current of 1.2 A through two rsistors each of $2 Ω$ connected in parallel. When the resistors are connected in series, it supplies a current of 0.4 A. Calculate: i) the internal resistance, and (ii) e.m.f. of the cell.

14.

A cell supplies a current of 1.2 A through two rsistors each of 2Ω connected in parallel. When the resistors are connected in series, it supplies a current of 0.4 A. Calculate: i) the internal resistance, and (ii) e.m.f. of the cell.

Answer»

A cell supplies a current of 1.2 A through two rsistors each of $2 Ω$ connected in parallel. When the resistors are connected in series, it supplies a current of 0.4 A. Calculate:

i) the internal resistance, and

(ii) e.m.f. of the cell.

Discussion

15.	What type of lens is used to correct (a) hypermetropia (b) myopia?
Answer» What type of lens is used to correct (a) hypermetropia (b) myopia?

Discussion

16.	A cell supplies a current of 2A when it is connected to a 5Ω resistance and supplies current of 1.2A, if it is connected to a resistance of 9Ω. Find the e.m.f of the cell.
Answer» A cell supplies a current of 2A when it is connected to a $5 Ω$ resistance and supplies current of 1.2A, if it is connected to a resistance of $9 Ω$ . Find the e.m.f of the cell.

Discussion

17.	By drawing ray diagrams, discuss the characteristics of the image formed by a convex lens when the object is: (a) between the optical centre and the focus. (b) at the focus. (c) at 2F1. (d) at infinity. [5 MARKS]
Answer» By drawing ray diagrams, discuss the characteristics of the image formed by a convex lens when the object is: (a) between the optical centre and the focus. (b) at the focus. (c) at $2 F_{1}$ . (d) at infinity. [5 MARKS]

Discussion

18.	A person cannot see distinctly objects kept beyond 2m. This defect can be corrected by using a lens of power
Answer» A person cannot see distinctly objects kept beyond 2m. This defect can be corrected by using a lens of power

Discussion

19.	The near point of a hypermetropic eye is 50cm. What is the nature and Power of the lens required to enable him to read a book at 25cm from the eye?
Answer» The near point of a hypermetropic eye is 50cm. What is the nature and Power of the lens required to enable him to read a book at 25cm from the eye?

Discussion

20.	Why light comes back in same way when passing through centre and why it becomes parallel in concave mirror
Answer» Why light comes back in same way when passing through centre and why it becomes parallel in concave mirror

Discussion

21.	A piece of ice of mass 40g is added to 200g of water at 50 degree Celsius. Calculate the final temperature of water when all the ice has melted. Specific heat capacity of water =4200 J per kg per K and specific latent heat of fusion of ice=336*1000 J per kg.
Answer» A piece of ice of mass 40g is added to 200g of water at 50 degree Celsius. Calculate the final temperature of water when all the ice has melted. Specific heat capacity of water =4200 J per kg per K and specific latent heat of fusion of ice=336*1000 J per kg.

Discussion

22.	What are ohmic and non ohmic resistors? What is the difference between them?
Answer» What are ohmic and non ohmic resistors? What is the difference between them?

Discussion

23.	Why does USA use DC instead of AC
Answer» Why does USA use DC instead of AC

Discussion

24.	If an actual machine has a mechanical advantage =10 and velocity ratio =5, What is its efficiency?2
Answer» If an actual machine has a mechanical advantage $= 10$ and velocity ratio $= 5$ , What is its efficiency? 2

Discussion

25.	The ratio of time period of three identical springs if they are first joined in parallel and then in series is (assume same mass is suspended from them)
Answer» The ratio of time period of three identical springs if they are first joined in parallel and then in series is (assume same mass is suspended from them)

Discussion

26.	One wants to see a magnified image of an object in a mirror. What type of mirror should one use ?
Answer» One wants to see a magnified image of an object in a mirror. What type of mirror should one use ?

Discussion

27.	A conductor is moving with a velocity of 12 m sec−1 perpendicular to the magnetic field of induction 0.45 T. An emf of 7.4 V is induced in the conductor. Find the length of the conductor.
Answer» A conductor is moving with a velocity of $12 m s e c^{- 1}$ perpendicular to the magnetic field of induction $0.45 T$ . An emf of $7.4 V$ is induced in the conductor. Find the length of the conductor.

Discussion

28.	When a shot-put champion releases a 5.0 kg shot, it is at 1.5 m above the ground and traveling at 10 m/s. It reaches a maximum height of 5 m above the ground. What are the total mechanical energy, kinetic energy and potential energy of the shot at its maximum height?
Answer» When a shot-put champion releases a 5.0 kg shot, it is at 1.5 m above the ground and traveling at 10 m/s. It reaches a maximum height of 5 m above the ground. What are the total mechanical energy, kinetic energy and potential energy of the shot at its maximum height?

Discussion

29.	A conductor depicted as AB is moving towards you, out of the plane, with two magnets kept as shown below. (G - galvanometer) Select the correct option regarding polarity of the magnets and the deflection of the galvanometer.Green - N; Red-S; G - right
Answer» A conductor depicted as AB is moving towards you, out of the plane, with two magnets kept as shown below. (G - galvanometer) Select the correct option regarding polarity of the magnets and the deflection of the galvanometer. Green - N; Red-S; G - right

Discussion

30.	What will be the current through 20ohm resistor if the switch S is closed?
Answer» What will be the current through 20ohm resistor if the switch S is closed?

30.

What will be the current through 20ohm resistor if the switch S is closed?

Answer»

What will be the current through 20ohm resistor if the switch S is closed?

Discussion

31.	What are the end products of protiens
Answer» What are the end products of protiens

Discussion

32.	One newton is that force which when acting on a body of mass 1 kg, produces an acceleration of
Answer» One newton is that force which when acting on a body of mass 1 kg, produces an acceleration of

Discussion

33.	A force of 2 N is applied at point B on wheel of diameter 4 m as shown in the figure. The torque about the centre O is and about the point A is.
Answer» A force of 2 N is applied at point B on wheel of diameter $4 m$ as shown in the figure. The torque about the centre O is and about the point A is.

Discussion

34.	Choose the alternative which is closely resembles the mirror image of the given combination.
Answer» Choose the alternative which is closely resembles the mirror image of the given combination.

34.

Choose the alternative which is closely resembles the mirror image of the given combination.

Answer»

Choose the alternative which is closely resembles the mirror image of the given combination.

Discussion

35.	A vehicle of 50 quintal climbs up a hill of 10 m. The potential energy gained by it is (take g = 10 m/s2)
Answer» A vehicle of 50 quintal climbs up a hill of 10 m. The potential energy gained by it is (take g = 10 m/s²)

Discussion

36.	Cryogenics is used for power transmission in big cities. Justify this statement.
Answer» Cryogenics is used for power transmission in big cities. Justify this statement.

Discussion

37.	A 3 cm high object is placed at a distance of 80 cm from a concave lens of focal length 20 cm. Find the position and size of the image.
Answer» A 3 cm high object is placed at a distance of 80 cm from a concave lens of focal length 20 cm. Find the position and size of the image.

Discussion

38.	What happens to the image formed by a convex lens if its lower part is blackened?
Answer» What happens to the image formed by a convex lens if its lower part is blackened?

Discussion

39.	At what distance the object should be placed in front of a concave lens of focal length 20 cm so that the image will be formed at distance 10 cm from the lens? What is the magnification of the object? [4 MARKS]
Answer» At what distance the object should be placed in front of a concave lens of focal length 20 cm so that the image will be formed at distance 10 cm from the lens? What is the magnification of the object? [4 MARKS]

Discussion

40.	The phenomenon of increase in amplitude when the driving force is close to the natural frequency of the oscillator is known as
Answer» The phenomenon of increase in amplitude when the driving force is close to the natural frequency of the oscillator is known as

Discussion

41.	Draw circuit symbols for (a) fixed resistance (b) variable resistance (c) a cell (d) a battery of three cells (e) an open switch (f) a closed switch.
Answer» Draw circuit symbols for (a) fixed resistance (b) variable resistance (c) a cell (d) a battery of three cells (e) an open switch (f) a closed switch.

Discussion

42.	A lens forms an erect, magnified, and virtual image of an object. (a) Name the kind of lens. (b) Where is the object placed in relation to the lens ? (c) Draw a ray diagram to show the formation of image. (d) Name the device which uses this principle.
Answer» A lens forms an erect, magnified, and virtual image of an object. (a) Name the kind of lens. (b) Where is the object placed in relation to the lens ? (c) Draw a ray diagram to show the formation of image. (d) Name the device which uses this principle.

Discussion

43.	Name the mirror which always produce an erect and virtual image. How is the size of image related to the size of object ?
Answer» Name the mirror which always produce an erect and virtual image. How is the size of image related to the size of object ?

Discussion

44.	Name the form of energy in which potential energy can change.
Answer» Name the form of energy in which potential energy can change.

Discussion

45.	What do you mean by the defects of vision?
Answer» What do you mean by the defects of vision?

Discussion

46.	State the relationship between angle of minimum deviation and angle of incidence.
Answer» State the relationship between angle of minimum deviation and angle of incidence.

Discussion

47.	If curent flows through two lamps arranged: (a) in series, (b) in parallel, and the filament of one lamps breaks, what happens to the other lamp ? Explain you answer.
Answer» If curent flows through two lamps arranged: (a) in series, (b) in parallel, and the filament of one lamps breaks, what happens to the other lamp ? Explain you answer.

Discussion

48.	Which of the types of radiation listed below has a wavelength slightly shorter than that of visible light and can cause certain materials to fluorescence?
Answer» Which of the types of radiation listed below has a wavelength slightly shorter than that of visible light and can cause certain materials to fluorescence?

Discussion

49.	(a) Explain why, though both a plane mirror and a sheet of paper reflect light but we can see the image of our face in a plane mirror but not in a sheet of paper. (b) The image in a plane mirror is virtual and laterally inverted. What does this statement mean? (c) Write all the capital letters of the alphabet which look the same in a plane mirror.
Answer» (a) Explain why, though both a plane mirror and a sheet of paper reflect light but we can see the image of our face in a plane mirror but not in a sheet of paper. (b) The image in a plane mirror is virtual and laterally inverted. What does this statement mean? (c) Write all the capital letters of the alphabet which look the same in a plane mirror.

49.

(a) Explain why, though both a plane mirror and a sheet of paper reflect light but we can see the image of our face in a plane mirror but not in a sheet of paper. (b) The image in a plane mirror is virtual and laterally inverted. What does this statement mean? (c) Write all the capital letters of the alphabet which look the same in a plane mirror.

Answer»

(a) Explain why, though both a plane mirror and a sheet of paper reflect light but we can see the image of our face in a plane mirror but not in a sheet of paper.

(b) The image in a plane mirror is virtual and laterally inverted. What does this statement mean?

(c) Write all the capital letters of the alphabet which look the same in a plane mirror.

Discussion

50.	The graph of potential difference (V) versus current (I) for an ohmic resistor is a straight line as shown below: The resistance of the resistor can be determined from this graph as:
Answer» The graph of potential difference (V) versus current (I) for an ohmic resistor is a straight line as shown below: The resistance of the resistor can be determined from this graph as:

50.

The graph of potential difference (V) versus current (I) for an ohmic resistor is a straight line as shown below: The resistance of the resistor can be determined from this graph as:

Answer»

The graph of potential difference (V) versus current (I) for an ohmic resistor is a straight line as shown below:

The resistance of the resistor can be determined from this graph as:

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Which of the following is not a similarity between a current carrying solenoid and a bar magnet?

A, B and C are three forces each of magnitude 4 N acting in the plane of paper as shown in fig. Which force has the least moment about O and which force has the greatest moment about O?

If the focal length of a spherical mirror is 12.5 cm, its radius of curvature will be : (a) 25 cm (b) 15 cm (c) 20 cm (d) 35 cm

How are the e.m.f. in the primary and secondary coils of a transformer related to the number of turns in these coils?

When does light not go in a straight line?

How to take sign conversions while doing problems with spherical mirrors?

(a) Arrange the following radiations in the order of their increasing wavelength : X rays, infrared rays, radio waves, gamma rays, and micro waves. (b) Name the radiation which is used for satellite communication.

(a) How many milliamperes are there in 1 ampere? (b) How many microamperes are there in 1 ampere?

Transformers works on mutual induction due to which magnetic field are generated .lf we will bring a magnetic needle near transformer will there be any deflection in the needle?

Why is ammeter likely to burn when connected in parallel in the circuit?

What measures would you suggest to minimize environmental pollution caused by burning of fossil.

Can't we use concavo-convex or convexo-concave instead of bifocal lens for presbyopia patient?

Disadvantages of series connection ?

A cell supplies a current of 1.2 A through two rsistors each of 2Ω connected in parallel. When the resistors are connected in series, it supplies a current of 0.4 A. Calculate: i) the internal resistance, and (ii) e.m.f. of the cell.

What type of lens is used to correct (a) hypermetropia (b) myopia?

A cell supplies a current of 2A when it is connected to a 5Ω resistance and supplies current of 1.2A, if it is connected to a resistance of 9Ω. Find the e.m.f of the cell.

By drawing ray diagrams, discuss the characteristics of the image formed by a convex lens when the object is: (a) between the optical centre and the focus. (b) at the focus. (c) at 2F1. (d) at infinity. [5 MARKS]

A person cannot see distinctly objects kept beyond 2m. This defect can be corrected by using a lens of power

The near point of a hypermetropic eye is 50cm. What is the nature and Power of the lens required to enable him to read a book at 25cm from the eye?

Why light comes back in same way when passing through centre and why it becomes parallel in concave mirror

A piece of ice of mass 40g is added to 200g of water at 50 degree Celsius. Calculate the final temperature of water when all the ice has melted. Specific heat capacity of water =4200 J per kg per K and specific latent heat of fusion of ice=336*1000 J per kg.

What are ohmic and non ohmic resistors? What is the difference between them?

Why does USA use DC instead of AC

If an actual machine has a mechanical advantage =10 and velocity ratio =5, What is its efficiency?2

The ratio of time period of three identical springs if they are first joined in parallel and then in series is (assume same mass is suspended from them)

One wants to see a magnified image of an object in a mirror. What type of mirror should one use ?

A conductor is moving with a velocity of 12 m sec−1 perpendicular to the magnetic field of induction 0.45 T. An emf of 7.4 V is induced in the conductor. Find the length of the conductor.

When a shot-put champion releases a 5.0 kg shot, it is at 1.5 m above the ground and traveling at 10 m/s. It reaches a maximum height of 5 m above the ground. What are the total mechanical energy, kinetic energy and potential energy of the shot at its maximum height?

A conductor depicted as AB is moving towards you, out of the plane, with two magnets kept as shown below. (G - galvanometer) Select the correct option regarding polarity of the magnets and the deflection of the galvanometer.Green - N; Red-S; G - right

What will be the current through 20ohm resistor if the switch S is closed?

What are the end products of protiens

One newton is that force which when acting on a body of mass 1 kg, produces an acceleration of

A force of 2 N is applied at point B on wheel of diameter 4 m as shown in the figure. The torque about the centre O is and about the point A is.

Choose the alternative which is closely resembles the mirror image of the given combination.

A vehicle of 50 quintal climbs up a hill of 10 m. The potential energy gained by it is (take g = 10 m/s2)

Cryogenics is used for power transmission in big cities. Justify this statement.

A 3 cm high object is placed at a distance of 80 cm from a concave lens of focal length 20 cm. Find the position and size of the image.

What happens to the image formed by a convex lens if its lower part is blackened?

At what distance the object should be placed in front of a concave lens of focal length 20 cm so that the image will be formed at distance 10 cm from the lens? What is the magnification of the object? [4 MARKS]

The phenomenon of increase in amplitude when the driving force is close to the natural frequency of the oscillator is known as

Draw circuit symbols for (a) fixed resistance (b) variable resistance (c) a cell (d) a battery of three cells (e) an open switch (f) a closed switch.

A lens forms an erect, magnified, and virtual image of an object. (a) Name the kind of lens. (b) Where is the object placed in relation to the lens ? (c) Draw a ray diagram to show the formation of image. (d) Name the device which uses this principle.

Name the mirror which always produce an erect and virtual image. How is the size of image related to the size of object ?

Name the form of energy in which potential energy can change.

What do you mean by the defects of vision?

State the relationship between angle of minimum deviation and angle of incidence.

If curent flows through two lamps arranged: (a) in series, (b) in parallel, and the filament of one lamps breaks, what happens to the other lamp ? Explain you answer.

Which of the types of radiation listed below has a wavelength slightly shorter than that of visible light and can cause certain materials to fluorescence?

The graph of potential difference (V) versus current (I) for an ohmic resistor is a straight line as shown below: The resistance of the resistor can be determined from this graph as: