16569 + Interview Questions in Physics

1.	The energy change that take place in an electromagnet is
Answer» The energy change that take place in an electromagnet is

Discussion

2.	(a) What is atmospheric refraction ? What causes atmospheric refraction ? (b) Why do stars twinkle on a clear night ? (c) Explain why, the planets do not twinkle at night.
Answer» (a) What is atmospheric refraction ? What causes atmospheric refraction ? (b) Why do stars twinkle on a clear night ? (c) Explain why, the planets do not twinkle at night.

Discussion

3.	In order to see comfortably for a normal human eye, what is the minimum distance at which an object should be placed?
Answer» In order to see comfortably for a normal human eye, what is the minimum distance at which an object should be placed?

Discussion

4.	In the formation of spectrum of white light by a prism : (i) which colour is devitated least ? (ii) which colour is deviated most ?
Answer» In the formation of spectrum of white light by a prism : (i) which colour is devitated least ? (ii) which colour is deviated most ?

Discussion

5.	Draw a circuit diagram to explain the ring system of house wiring. State two advantages of it.
Answer» Draw a circuit diagram to explain the ring system of house wiring. State two advantages of it.

5.

Draw a circuit diagram to explain the ring system of house wiring. State two advantages of it.

Answer»

Draw a circuit diagram to explain the ring system of house wiring. State two advantages of it.

Discussion

6.	An electric bulb draws 1.2 A current at 6.0 V. Find the resistance of filament of the bulb while glowing.
Answer» An electric bulb draws 1.2 A current at 6.0 V. Find the resistance of filament of the bulb while glowing.

Discussion

7.	Question 2 Compute the heat generated while transferring 96000 coulombs of charge in one hour through a potential difference of 50 V.
Answer» Question 2 Compute the heat generated while transferring 96000 coulombs of charge in one hour through a potential difference of 50 V.

Discussion

8.	Name the type of nuclear reaction which is involved in the working of : (a) a hydrogen bomb. (b) an atom bomb.
Answer» Name the type of nuclear reaction which is involved in the working of : (a) a hydrogen bomb. (b) an atom bomb.

Discussion

9.	A nuclear reaction is represented by the following equation : 23592U + 10n ⟶ 13956Ba + 9436Kr +xc+E (a) Name the process represented by this equation and describe what takes place in this reaction. (b) Identify the particle c and the number x of such particles produced in the reaction. (c) What does E represent ? (d) Name one installation where the above nuclear reaction is utilised. (e) What type of bomb is based on similar type of reactions ?
Answer» A nuclear reaction is represented by the following equation : $23592 U + 10 n ⟶ 13956 B a + 9436 K r + x c + E$ (a) Name the process represented by this equation and describe what takes place in this reaction. (b) Identify the particle c and the number x of such particles produced in the reaction. (c) What does E represent ? (d) Name one installation where the above nuclear reaction is utilised. (e) What type of bomb is based on similar type of reactions ?

Discussion

10.	A & C are centre of spheres. What is the centre of curvature of above convex lens?
Answer» A & C are centre of spheres. What is the centre of curvature of above convex lens?

Discussion

11.	The current flowing from the battery if the EMF of the battery is 1 Volts:
Answer» The current flowing from the battery if the EMF of the battery is 1 Volts:

11.

The current flowing from the battery if the EMF of the battery is 1 Volts:

Answer»

The current flowing from the battery if the EMF of the battery is 1 Volts:

Discussion

12.	Boiling point curve of a liquid at a particular pressure is given in the figure below: Choose the correct boiling curve, when we decrease the pressure.
Answer» Boiling point curve of a liquid at a particular pressure is given in the figure below: Choose the correct boiling curve, when we decrease the pressure.

Discussion

13.	A uniform wire of resistance 100 Ω is melted and recast in a wire of length double that of the original. What would be the resistance of the wire ?
Answer» A uniform wire of resistance 100 $Ω$ is melted and recast in a wire of length double that of the original. What would be the resistance of the wire ?

Discussion

14.	Solar cells convert solar energy into:
Answer» Solar cells convert solar energy into:

Discussion

15.	The maximum number of electrons that can be accomodated in the M-shell of an atom is.
Answer» The maximum number of electrons that can be accomodated in the M-shell of an atom is.

Discussion

16.	A stretched circular loop is released in magnetic field B= 2t Tesla as shown in Figure. Radius of loop is shrinking at the rate of 0.1 m/s. At t=0, radius of loop was 3.5m and its resistance is 2Ωthat is constant. Find current in loop at t= 5sec
Answer» A stretched circular loop is released in magnetic field B= 2t Tesla as shown in Figure. Radius of loop is shrinking at the rate of 0.1 m/s. At t=0, radius of loop was 3.5m and its resistance is 2 $Ω$ that is constant. Find current in loop at t= 5sec

Discussion

17.	The magnification in a spherical mirror is:
Answer» The magnification in a spherical mirror is:

Discussion

18.	Define 1-newton force.
Answer» Define 1-newton force.

Discussion

19.	In a circuit, a voltmeter is connected in parallel with a resistance R and reads 20V. An ammeter is connected with this combination in series and reads 5A. The correct value of resistance R is:
Answer» In a circuit, a voltmeter is connected in parallel with a resistance R and reads 20V. An ammeter is connected with this combination in series and reads 5A. The correct value of resistance R is:

Discussion

20.	What is selective scattering?
Answer» What is selective scattering?

Discussion

21.	Name the defect of vision which makes the eye-lens cloudy resulting in blurred vision.
Answer» Name the defect of vision which makes the eye-lens cloudy resulting in blurred vision.

Discussion

22.	What are the various fuels which are used to generate electricity in a thermal power plant?
Answer» What are the various fuels which are used to generate electricity in a thermal power plant?

Discussion

23.	Question 6 Which of the following lenses would you prefer to use while reading small letters found in a dictionary? (a) A convex lens of focal length 50 cm (b) A concave lens of focal length 50 cm (c) A convex lens of focal length 5 cm (d) A concave lens of focal length 5 cm
Answer» Question 6 Which of the following lenses would you prefer to use while reading small letters found in a dictionary? (a) A convex lens of focal length 50 cm (b) A concave lens of focal length 50 cm (c) A convex lens of focal length 5 cm (d) A concave lens of focal length 5 cm

Discussion

24.	The front face of a circular wire carrying current behaves like a north pole. The direction of current in this face of the circular wire is : (a) clockwise (b) downwards (c) anticlockwise (d) upwards
Answer» The front face of a circular wire carrying current behaves like a north pole. The direction of current in this face of the circular wire is : (a) clockwise (b) downwards (c) anticlockwise (d) upwards

24.

The front face of a circular wire carrying current behaves like a north pole. The direction of current in this face of the circular wire is : (a) clockwise (b) downwards (c) anticlockwise (d) upwards

Answer»

The front face of a circular wire carrying current behaves like a north pole. The direction of current in this face of the circular wire is :

(a) clockwise (b) downwards (c) anticlockwise (d) upwards

Discussion

25.	A particle moves along a circular path over a horizontal XY coordinate system, at constant speed. At time t1=5 s, it is at point (5.00 m, 6.00 m) with velocity (3π m/s)j and acceleration in the positive X direction. At time t2=10 s, it has velocity (−3π m/s)i and acceleration in the positive Y direction. What are the (a) X and (b) Y coordinates of the center of the circular path if t2−t1 is less than one period?
Answer» A particle moves along a circular path over a horizontal XY coordinate system, at constant speed. At time $t_{1} = 5 s$ , it is at point (5.00 m, 6.00 m) with velocity $(3 π m / s) j$ and acceleration in the positive X direction. At time $t_{2} = 10 s$ , it has velocity $(- 3 π m / s) i$ and acceleration in the positive Y direction. What are the (a) X and (b) Y coordinates of the center of the circular path if $t_{2} - t_{1}$ is less than one period?

Discussion

26.	How angle of bending of light depend on wavelength of the light ?
Answer» How angle of bending of light depend on wavelength of the light ?

Discussion

27.	Suppose we have an equilateral prism. Now, if the prism is filled with water, then the deviation of the light would depend on which of these - refractive index of water or that of glass (of which prism is made up of), according to the formula: Deviation = Angle of the prism * (refractive index of the prism - 1) Here, the angle of the prism would be 60 degrees.
Answer» Suppose we have an equilateral prism. Now, if the prism is filled with water, then the deviation of the light would depend on which of these - refractive index of water or that of glass (of which prism is made up of), according to the formula: Deviation = Angle of the prism * (refractive index of the prism - 1) Here, the angle of the prism would be 60 degrees.

27.

Suppose we have an equilateral prism. Now, if the prism is filled with water, then the deviation of the light would depend on which of these - refractive index of water or that of glass (of which prism is made up of), according to the formula: Deviation = Angle of the prism * (refractive index of the prism - 1) Here, the angle of the prism would be 60 degrees.

Answer»

Suppose we have an equilateral prism. Now, if the prism is filled with water, then the deviation of the light would depend on which of these - refractive index of water or that of glass (of which prism is made up of), according to the formula:

Deviation = Angle of the prism * (refractive index of the prism - 1)

Here, the angle of the prism would be 60 degrees.

Discussion

28.	The critical angle for diamond ( refractive index=2.4 ) is
Answer» The critical angle for diamond $( refractive index=2.4 )$ is

28.

The critical angle for diamond ( refractive index=2.4 ) is

Answer»

The critical angle for diamond $( refractive index=2.4 )$ is

Discussion

29.	Number of joules in 1 kWh is
Answer» Number of joules in 1 kWh is

Discussion

30.	Name the rule for finding the direction of magnetic field produced by a straight current-carrying conductor.
Answer» Name the rule for finding the direction of magnetic field produced by a straight current-carrying conductor.

Discussion

31.	Which of the following describes the common domestic power supplied in India?
Answer» Which of the following describes the common domestic power supplied in India?

Discussion

32.	Two lamps, one rated 40 W at 220 V and the other 60 W at 220 V, are connected in parallel to the electric supply at 220 V. (a) Craw a circuit diagram to show the connections. (b) Calculate the current drawn from the electric supply. (c) Calculate the total energy consumed by the two lamps together when they operate for one hour.
Answer» Two lamps, one rated 40 W at 220 V and the other 60 W at 220 V, are connected in parallel to the electric supply at 220 V. (a) Craw a circuit diagram to show the connections. (b) Calculate the current drawn from the electric supply. (c) Calculate the total energy consumed by the two lamps together when they operate for one hour.

32.

Two lamps, one rated 40 W at 220 V and the other 60 W at 220 V, are connected in parallel to the electric supply at 220 V. (a) Craw a circuit diagram to show the connections. (b) Calculate the current drawn from the electric supply. (c) Calculate the total energy consumed by the two lamps together when they operate for one hour.

Answer»

Two lamps, one rated 40 W at 220 V and the other 60 W at 220 V, are connected in parallel to the electric supply at 220 V.

(a) Craw a circuit diagram to show the connections.

(b) Calculate the current drawn from the electric supply.

(c) Calculate the total energy consumed by the two lamps together when they operate for one hour.

Discussion

33.	Where in the sky would you expect to see a rainbow in the evening?
Answer» Where in the sky would you expect to see a rainbow in the evening?

Discussion

34.	The optician's prescription for a spectacle lens is marked + 0.5 D. What is the : (a) nature of spectacle lens ? (b) focal length of spectacle lens ?
Answer» The optician's prescription for a spectacle lens is marked + 0.5 D. What is the : (a) nature of spectacle lens ? (b) focal length of spectacle lens ?

Discussion

35.	In the following figure, the force F is gradually increased from zero. Draw the graph between the magnitude of F and the tension T in the string. The coefficient of static friction between the block and the ground is μ. Assume coefficient of kinetic friction and that of static friction to be equal.
Answer» In the following figure, the force F is gradually increased from zero. Draw the graph between the magnitude of F and the tension T in the string. The coefficient of static friction between the block and the ground is $μ$ . Assume coefficient of kinetic friction and that of static friction to be equal.

Discussion

36.	A ring of radius 1m has moment of inertia of 10kg−m2 about an axis through its centre and perpendicular to its plane. If a constant force of 50N is applied to it tangentially as shown, what will be its angular acceleration?
Answer» A ring of radius 1m has moment of inertia of $10 k g - m^{2}$ about an axis through its centre and perpendicular to its plane. If a constant force of 50N is applied to it tangentially as shown, what will be its angular acceleration?

Discussion

37.	Why is AC attractive in nature and DC repulsive? AC : Alternating current DC : Direct current
Answer» Why is AC attractive in nature and DC repulsive? AC : Alternating current DC : Direct current

Discussion

38.	In a plane mirror, an object is 0.5 m in front of the mirror. The distance between object and image is -
Answer» In a plane mirror, an object is 0.5 m in front of the mirror. The distance between object and image is -

Discussion

39.	Two resistances are connected in series as shown in the diagram. (i) What is the current through the 5 ohm resistance? (ii) What is the current through R? (iii) What is the value of R? (iv) What is the value of V? [5 MARKS]
Answer» Two resistances are connected in series as shown in the diagram. (i) What is the current through the 5 ohm resistance? (ii) What is the current through R? (iii) What is the value of R? (iv) What is the value of V? [5 MARKS]

Discussion

40.	What is the range of temperature which can be achieved in a box-type solar cooker in two to three hours ?
Answer» What is the range of temperature which can be achieved in a box-type solar cooker in two to three hours ?

Discussion

41.	The energy which is not derived from the sun is
Answer» The energy which is not derived from the sun is

Discussion

42.	Explain the demerits of fossil fuels.
Answer» Explain the demerits of fossil fuels.

Discussion

43.	How does the medium affect the amplitude of the natural vibrations of a body ?
Answer» How does the medium affect the amplitude of the natural vibrations of a body ?

Discussion

44.	The diagram shows the core of a transformer and its input and output connections. (a) State the material used for the core and describe its structure. (b) Complete the diagram of the transformer and connections by labelling all parts joined by you. (c) Name the transformer: step-up or step-down?
Answer» The diagram shows the core of a transformer and its input and output connections. (a) State the material used for the core and describe its structure. (b) Complete the diagram of the transformer and connections by labelling all parts joined by you. (c) Name the transformer: step-up or step-down?

44.

The diagram shows the core of a transformer and its input and output connections. (a) State the material used for the core and describe its structure. (b) Complete the diagram of the transformer and connections by labelling all parts joined by you. (c) Name the transformer: step-up or step-down?

Answer»

The diagram shows the core of a transformer and its input and output connections.
(a) State the material used for the core and describe its structure.

(b) Complete the diagram of the transformer and connections by labelling all parts joined by you.
(c) Name the transformer: step-up or step-down?

Discussion

45.	A SONAR device uses ultrasound to find the depth of a lake to be 20 m. If the sound is reflected back to the device in about 129th of a second, what is the speed of the sound in the lake?1160
Answer» A SONAR device uses ultrasound to find the depth of a lake to be $20 m$ . If the sound is reflected back to the device in about $\frac{1}{29} th$ of a second, what is the speed of the sound in the lake? 1160

Discussion

46.	A vessel of depth 2d cm is half filled with a liquid of refractive index μ1 and the upper half with a liquid of refractive index μ2. The apparent depth of the vessel seen perpendicularly is
Answer» A vessel of depth $2 d c m$ is half filled with a liquid of refractive index $μ_{1}$ and the upper half with a liquid of refractive index $μ_{2}$ . The apparent depth of the vessel seen perpendicularly is

46.

A vessel of depth 2d cm is half filled with a liquid of refractive index μ1 and the upper half with a liquid of refractive index μ2. The apparent depth of the vessel seen perpendicularly is

Answer»

A vessel of depth $2 d c m$ is half filled with a liquid of refractive index $μ_{1}$ and the upper half with a liquid of refractive index $μ_{2}$ . The apparent depth of the vessel seen perpendicularly is

Discussion

47.	Question 25 A convex lens of focal length 20 cm can produce a magnified virtual as well as real image. Is this a correct statement? If yes, where shall the object be placed in each case for obtaining these images?
Answer» Question 25 A convex lens of focal length 20 cm can produce a magnified virtual as well as real image. Is this a correct statement? If yes, where shall the object be placed in each case for obtaining these images?

Discussion

48.	Which form of energy helps in the production of electricity in wind turbines?
Answer» Which form of energy helps in the production of electricity in wind turbines?

Discussion

49.	A uniform sphere of mass M and radius R exerts a force F on a small mass m situated at a distance of 2R from the centre O of the sphere. A spherical portion of diameter R is cut from the sphere as shown in the figure. The force of attraction between the remaining part of the sphere and the mass m will be:
Answer» A uniform sphere of mass $M$ and radius $R$ exerts a force $F$ on a small mass $m$ situated at a distance of $2 R$ from the centre $O$ of the sphere. A spherical portion of diameter $R$ is cut from the sphere as shown in the figure. The force of attraction between the remaining part of the sphere and the mass $m$ will be:

49.

A uniform sphere of mass M and radius R exerts a force F on a small mass m situated at a distance of 2R from the centre O of the sphere. A spherical portion of diameter R is cut from the sphere as shown in the figure. The force of attraction between the remaining part of the sphere and the mass m will be:

Answer»

A uniform sphere of mass $M$ and radius $R$ exerts a force $F$ on a small mass $m$ situated at a distance of $2 R$ from the centre $O$ of the sphere. A spherical portion of diameter $R$ is cut from the sphere as shown in the figure. The force of attraction between the remaining part of the sphere and the mass $m$ will be:

Discussion

50.	If the length of the filament of a heater is reduced by 10% by cutting it, the power of the heater will?
Answer» If the length of the filament of a heater is reduced by 10% by cutting it, the power of the heater will?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The energy change that take place in an electromagnet is

(a) What is atmospheric refraction ? What causes atmospheric refraction ? (b) Why do stars twinkle on a clear night ? (c) Explain why, the planets do not twinkle at night.

In order to see comfortably for a normal human eye, what is the minimum distance at which an object should be placed?

In the formation of spectrum of white light by a prism : (i) which colour is devitated least ? (ii) which colour is deviated most ?

Draw a circuit diagram to explain the ring system of house wiring. State two advantages of it.

An electric bulb draws 1.2 A current at 6.0 V. Find the resistance of filament of the bulb while glowing.

Question 2 Compute the heat generated while transferring 96000 coulombs of charge in one hour through a potential difference of 50 V.

Name the type of nuclear reaction which is involved in the working of : (a) a hydrogen bomb. (b) an atom bomb.

A &amp; C are centre of spheres. What is the centre of curvature of above convex lens?

The current flowing from the battery if the EMF of the battery is 1 Volts:

Boiling point curve of a liquid at a particular pressure is given in the figure below: Choose the correct boiling curve, when we decrease the pressure.

A uniform wire of resistance 100 Ω is melted and recast in a wire of length double that of the original. What would be the resistance of the wire ?

Solar cells convert solar energy into:

The maximum number of electrons that can be accomodated in the M-shell of an atom is.

A stretched circular loop is released in magnetic field B= 2t Tesla as shown in Figure. Radius of loop is shrinking at the rate of 0.1 m/s. At t=0, radius of loop was 3.5m and its resistance is 2Ωthat is constant. Find current in loop at t= 5sec

The magnification in a spherical mirror is:

Define 1-newton force.

In a circuit, a voltmeter is connected in parallel with a resistance R and reads 20V. An ammeter is connected with this combination in series and reads 5A. The correct value of resistance R is:

What is selective scattering?

Name the defect of vision which makes the eye-lens cloudy resulting in blurred vision.

What are the various fuels which are used to generate electricity in a thermal power plant?

Question 6 Which of the following lenses would you prefer to use while reading small letters found in a dictionary? (a) A convex lens of focal length 50 cm (b) A concave lens of focal length 50 cm (c) A convex lens of focal length 5 cm (d) A concave lens of focal length 5 cm

The front face of a circular wire carrying current behaves like a north pole. The direction of current in this face of the circular wire is : (a) clockwise (b) downwards (c) anticlockwise (d) upwards

How angle of bending of light depend on wavelength of the light ?

The critical angle for diamond ( refractive index=2.4 ) is

Number of joules in 1 kWh is

Name the rule for finding the direction of magnetic field produced by a straight current-carrying conductor.

Which of the following describes the common domestic power supplied in India?

Where in the sky would you expect to see a rainbow in the evening?

The optician's prescription for a spectacle lens is marked + 0.5 D. What is the : (a) nature of spectacle lens ? (b) focal length of spectacle lens ?

A ring of radius 1m has moment of inertia of 10kg−m2 about an axis through its centre and perpendicular to its plane. If a constant force of 50N is applied to it tangentially as shown, what will be its angular acceleration?

Why is AC attractive in nature and DC repulsive? AC : Alternating current DC : Direct current

In a plane mirror, an object is 0.5 m in front of the mirror. The distance between object and image is -

Two resistances are connected in series as shown in the diagram. (i) What is the current through the 5 ohm resistance? (ii) What is the current through R? (iii) What is the value of R? (iv) What is the value of V? [5 MARKS]

What is the range of temperature which can be achieved in a box-type solar cooker in two to three hours ?

The energy which is not derived from the sun is

Explain the demerits of fossil fuels.

How does the medium affect the amplitude of the natural vibrations of a body ?

The diagram shows the core of a transformer and its input and output connections. (a) State the material used for the core and describe its structure. (b) Complete the diagram of the transformer and connections by labelling all parts joined by you. (c) Name the transformer: step-up or step-down?

A SONAR device uses ultrasound to find the depth of a lake to be 20 m. If the sound is reflected back to the device in about 129th of a second, what is the speed of the sound in the lake?1160

A vessel of depth 2d cm is half filled with a liquid of refractive index μ1 and the upper half with a liquid of refractive index μ2. The apparent depth of the vessel seen perpendicularly is

Question 25 A convex lens of focal length 20 cm can produce a magnified virtual as well as real image. Is this a correct statement? If yes, where shall the object be placed in each case for obtaining these images?

Which form of energy helps in the production of electricity in wind turbines?

If the length of the filament of a heater is reduced by 10% by cutting it, the power of the heater will?

A & C are centre of spheres. What is the centre of curvature of above convex lens?