16569 + Interview Questions in Physics

1.	Three rings P, Q and R are dropped at the same time over identical hollow magnets as shown below: Which of the following describes the order in which the ring P, Q and R reach the bottom of the magnet?
Answer» Three rings P, Q and R are dropped at the same time over identical hollow magnets as shown below: Which of the following describes the order in which the ring P, Q and R reach the bottom of the magnet?

1.

Three rings P, Q and R are dropped at the same time over identical hollow magnets as shown below: Which of the following describes the order in which the ring P, Q and R reach the bottom of the magnet?

Answer»

Three rings P, Q and R are dropped at the same time over identical hollow magnets as shown below:

Which of the following describes the order in which the ring P, Q and R reach the bottom of the magnet?

2.	What is the meaning of angle of deviation?
Answer» What is the meaning of angle of deviation?

Discussion

3.	A ray of light falls normally on the surface of a transparent glass slab.Draw a ray diagram to show its path and also mark angle of incidence and angle of emergence.
Answer» A ray of light falls normally on the surface of a transparent glass slab.Draw a ray diagram to show its path and also mark angle of incidence and angle of emergence.

Discussion

4.	Give the usual name for the following : A point inside a lens through which the light passes undeviated.
Answer» Give the usual name for the following : A point inside a lens through which the light passes undeviated.

Discussion

5.	The danger signal is red. Why?
Answer» The danger signal is red. Why?

Discussion

6.	Fill in the following blanks with suitable words : (a) The reciprocal of the focal length in metres gives you the of ___the lens, which is measured in ___ (b) For converging lenses, the power is ___while for diverging lenses, the power is ___.
Answer» Fill in the following blanks with suitable words : (a) The reciprocal of the focal length in metres gives you the of ___the lens, which is measured in ___ (b) For converging lenses, the power is ___while for diverging lenses, the power is ___.

Discussion

7.	What is internal resistance?
Answer» What is internal resistance?

Discussion

8.	A convex lens of power 5D is placed at a distance of 30 cm from a screen. At what distance from the lens should the object be placed so that its image is formed on the screen? [3 MARKS]
Answer» A convex lens of power 5D is placed at a distance of 30 cm from a screen. At what distance from the lens should the object be placed so that its image is formed on the screen? [3 MARKS]

Discussion

9.	The resistance of a wire is r Ω. The wire is stretched to double its length, then its resistance is
Answer» The resistance of a wire is r $Ω$ . The wire is stretched to double its length, then its resistance is

Discussion

10.	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

11.	What is electromagnet and what is fuse? Define magnetic effect of current.
Answer» What is electromagnet and what is fuse? Define magnetic effect of current.

Discussion

12.	Why the bottom of the pool appears to be raised?
Answer» Why the bottom of the pool appears to be raised?

Discussion

13.	In which of the following solar cells are majorly used?
Answer» In which of the following solar cells are majorly used?

Discussion

14.	An object is placed 18 cm from a convex mirror of radius of curvature 18 cm. Find the position of image.
Answer» An object is placed 18 cm from a convex mirror of radius of curvature 18 cm. Find the position of image.

Discussion

15.	During the phase change, the temperature of the substance_____.
Answer» During the phase change, the temperature of the substance_____.

15.

During the phase change, the temperature of the substance_____.

Answer»

During the phase change, the temperature of the substance_____.

Discussion

16.	What do you think electrical energy actually is? For what do you pay electric bill ?
Answer» What do you think electrical energy actually is? For what do you pay electric bill ?

Discussion

17.	A body cools from 60∘C to 50∘C in 10 minutes when kept in air at 30∘C. In the next 10 minutes, its temperature will be
Answer» A body cools from $60^{\circ} C$ to $50^{\circ} C$ in 10 minutes when kept in air at $30^{\circ} C$ . In the next 10 minutes, its temperature will be

Discussion

18.	A sperical mirror produces an image of magnification -1 on a screen placed at a distance of 50 cm from the mirror write the type of mirror?
Answer» A sperical mirror produces an image of magnification -1 on a screen placed at a distance of 50 cm from the mirror write the type of mirror?

Discussion

19.	Can light be converted into mass?
Answer» Can light be converted into mass?

Discussion

20.	What are condition when the light is in wave ,particle and Ray.
Answer» What are condition when the light is in wave ,particle and Ray.

Discussion

21.	According to convention, the direction of flow of electric current is taken from the positive terminal to the negative terminal of a battery, which is opposite to the flow of ___.
Answer» According to convention, the direction of flow of electric current is taken from the positive terminal to the negative terminal of a battery, which is opposite to the flow of ___.

Discussion

22.	A ray of light travelling in air is incident on the plane of a transparent medium. The angle of incidence is 45∘ and that of refraction is 30∘. Find the refractive index of the medium.
Answer» A ray of light travelling in air is incident on the plane of a transparent medium. The angle of incidence is $45^{\circ}$ and that of refraction is $30^{\circ}$ . Find the refractive index of the medium.

22.

A ray of light travelling in air is incident on the plane of a transparent medium. The angle of incidence is 45∘ and that of refraction is 30∘. Find the refractive index of the medium.

Answer»

A ray of light travelling in air is incident on the plane of a transparent medium. The angle of incidence is $45^{\circ}$ and that of refraction is $30^{\circ}$ . Find the refractive index of the medium.

Discussion

23.	A force of 100 dynes acts on mass of 5 gm for 10 sec. The velocity produced is
Answer» A force of 100 dynes acts on mass of 5 gm for 10 sec. The velocity produced is

Discussion

24.	The ejected electrons from the surface of metal in photoelectric effect are called
Answer» The ejected electrons from the surface of metal in photoelectric effect are called

Discussion

25.	250 g of ice at 0 ∘C converts into water at 0 ∘C in a minute, when a constant heat is supplied. In how much time (sec) the water thus obtained will change to 20 ∘C? The specific latent heat of ice is 336 J g−1. The specific heat capacity of water is 4.2 J g−1 ∘C−1.
Answer» $250 g$ of ice at $0^{\circ} C$ converts into water at $0^{\circ} C$ in a minute, when a constant heat is supplied. In how much time (sec) the water thus obtained will change to $20^{\circ} C$ ? The specific latent heat of ice is $336 {J g}^{- 1}$ . The specific heat capacity of water is $4.2 {J g}^{- 1}^{\circ} C^{- 1}$ .

Discussion

26.	How a split ring works in a motor
Answer» How a split ring works in a motor

Discussion

27.	With object at ∞, sort the focal lengths of the convex lenses as their image distance increases.
Answer» With object at $\infty$ , sort the focal lengths of the convex lenses as their image distance increases.

Discussion

28.	How were coal and petroleum formed? [1 MARK]
Answer» How were coal and petroleum formed? [1 MARK]

Discussion

29.	Although coal and petroleum are produced by the degradation of biomass, even then we need to conserve them. Why?
Answer» Although coal and petroleum are produced by the degradation of biomass, even then we need to conserve them. Why?

Discussion

30.	A block and tackle system of 5 pulleys is used to raise a load of 50 kgf steadily through a height of 20 m. The work done against friction is 2000J. Calculate the work done by the effort
Answer» A block and tackle system of 5 pulleys is used to raise a load of 50 kgf steadily through a height of 20 m. The work done against friction is 2000J. Calculate the work done by the effort

Discussion

31.	What is the main purpose of water shed harvesting?
Answer» What is the main purpose of water shed harvesting?

Discussion

32.	A lens forms an upright and diminshed image of an object placed at its focal point. Name the lens and draw a ray diagram to show the formation of image.
Answer» A lens forms an upright and diminshed image of an object placed at its focal point. Name the lens and draw a ray diagram to show the formation of image.

Discussion

33.	A meter rule can be balanced about 60 cm mark by placing a block of weight ‘m’ g at 90 cm mark. Express the mass of ruler ‘W’ in terms of mass of the block.
Answer» A meter rule can be balanced about 60 cm mark by placing a block of weight ‘m’ g at 90 cm mark. Express the mass of ruler ‘W’ in terms of mass of the block.

Discussion

34.	1. A ray of light travelling in air falls on the surface of a glass slab at an angle 45° with the normal. The refractive index of glass is 1.5. Calculate the angle of refraction. 2. A point object is placed at a distance of 18 cm from a convex lens on its principal axis. Its image is formed on the other side of the lens at 27 cm. Calculate the focal length of the lens. [5 MARKS]
Answer» 1. A ray of light travelling in air falls on the surface of a glass slab at an angle 45° with the normal. The refractive index of glass is 1.5. Calculate the angle of refraction. 2. A point object is placed at a distance of 18 cm from a convex lens on its principal axis. Its image is formed on the other side of the lens at 27 cm. Calculate the focal length of the lens. [5 MARKS]

Discussion

35.	In an A.C. generator, the speed at which the coil rotates is doubled. How would this effect (a) the frequency of the output voltage, (b) the maximum output voltage?
Answer» In an A.C. generator, the speed at which the coil rotates is doubled. How would this effect (a) the frequency of the output voltage, (b) the maximum output voltage?

Discussion

36.	Identify the condition which will form enlarged, virtual and erect image.
Answer» Identify the condition which will form enlarged, virtual and erect image.

Discussion

37.	If the angle of incidence is at 30∘. Find the angle of deflection, after reflecting 2 times.
Answer» If the angle of incidence is at $30^{\circ}$ . Find the angle of deflection, after reflecting 2 times.

37.

If the angle of incidence is at 30∘. Find the angle of deflection, after reflecting 2 times.

Answer»

If the angle of incidence is at $30^{\circ}$ . Find the angle of deflection, after reflecting 2 times.

Discussion

38.	How can we transmit electricity wireless over long distance
Answer» How can we transmit electricity wireless over long distance

Discussion

39.	The effective resistance in series combination is (A) smaller than the largest resistance (B) smaller than the smallest resistance (C) larger than the largest resistance (D) None of these.
Answer» The effective resistance in series combination is (A) smaller than the largest resistance (B) smaller than the smallest resistance (C) larger than the largest resistance (D) None of these.

Discussion

40.	Choose the correct option: 1.Tonei.frequencies that are integral multiple of fundamental frequency.2.Noteii.sound of single frequency.3.Overtoneiii.sound of multiple frequencies.4.Harmoniciv.higher frequencies other than fundamental frequency.
Answer» Choose the correct option: $\begin{matrix} 1. & Tone & i . & frequencies that are integral multiple of fundamental frequency. 2. & Note & i i . & sound of single frequency. 3. & Overtone & i i i . & sound of multiple frequencies. 4. & Harmonic & i v . & higher frequencies other than fundamental frequency. \end{matrix}$

40.

Choose the correct option: 1.Tonei.frequencies that are integral multiple of fundamental frequency.2.Noteii.sound of single frequency.3.Overtoneiii.sound of multiple frequencies.4.Harmoniciv.higher frequencies other than fundamental frequency.

Answer»

Choose the correct option:

$\begin{matrix} 1. & Tone & i . & frequencies that are integral multiple of fundamental frequency. 2. & Note & i i . & sound of single frequency. 3. & Overtone & i i i . & sound of multiple frequencies. 4. & Harmonic & i v . & higher frequencies other than fundamental frequency. \end{matrix}$

Discussion

41.	If the wavelength of a sound wave is 40 cm and the time period T = 0.005 s, how many seconds will it take to travel 4 km?
Answer» If the wavelength of a sound wave is 40 cm and the time period T = 0.005 s, how many seconds will it take to travel 4 km?

Discussion

42.	Why is electromagnetic induction so called ?
Answer» Why is electromagnetic induction so called ?

Discussion

43.	"The angle between the 2 lateral faces of the prism is called angle of the prism". What are the two lateral faces ?
Answer» "The angle between the 2 lateral faces of the prism is called angle of the prism". What are the two lateral faces ?

Discussion

44.	Q20. Consider the following statements about Copernicus Programme: 1. Copernicus is the world’s largest single earth observation Programme. 2. It is directed by the European Commission in partnership with the European Space Agency. Which of the statements are correct?
Answer» Q20. Consider the following statements about Copernicus Programme: 1. Copernicus is the world’s largest single earth observation Programme. 2. It is directed by the European Commission in partnership with the European Space Agency. Which of the statements are correct?

44.

Q20. Consider the following statements about Copernicus Programme: 1. Copernicus is the world’s largest single earth observation Programme. 2. It is directed by the European Commission in partnership with the European Space Agency. Which of the statements are correct?

Answer»

Q20. Consider the following statements about Copernicus Programme:

1. Copernicus is the world’s largest single earth observation Programme.

2. It is directed by the European Commission in partnership with the European Space Agency.

Which of the statements are correct?

Discussion

45.	Which part of retina has greater visual activity?
Answer» Which part of retina has greater visual activity?

Discussion

46.	Write a short note on the pollution caused by burning fossil fuels.
Answer» Write a short note on the pollution caused by burning fossil fuels.

Discussion

47.	What is the function of a resistor?
Answer» What is the function of a resistor?

Discussion

48.	If AB = 10 cm & DB = 40 cm (diameter). What is the radius of curvature & focal length of the spherical glass?
Answer» If AB = 10 cm & DB = 40 cm (diameter). What is the radius of curvature & focal length of the spherical glass?

Discussion

49.	A concave lens of focal length f forms an image which is n times the size of the object. The distance of the object from the lens is:
Answer» A concave lens of focal length $f$ forms an image which is $n$ times the size of the object. The distance of the object from the lens is:

Discussion

50.	Question 6 A copper wire has diameter 0.5 mm and resistivity of 1.6×10−8 Ω m. What will be the length of this wire to make its resistance 10 Ω ? How much does the resistance change if the diameter is doubled?
Answer» Question 6 A copper wire has diameter 0.5 mm and resistivity of $1.6 \times 10^{- 8} Ω m$ . What will be the length of this wire to make its resistance $10 Ω$ ? How much does the resistance change if the diameter is doubled?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Three rings P, Q and R are dropped at the same time over identical hollow magnets as shown below: Which of the following describes the order in which the ring P, Q and R reach the bottom of the magnet?

What is the meaning of angle of deviation?

A ray of light falls normally on the surface of a transparent glass slab.Draw a ray diagram to show its path and also mark angle of incidence and angle of emergence.

Give the usual name for the following : A point inside a lens through which the light passes undeviated.

The danger signal is red. Why?

Fill in the following blanks with suitable words : (a) The reciprocal of the focal length in metres gives you the of ___the lens, which is measured in ___ (b) For converging lenses, the power is ___while for diverging lenses, the power is ___.

What is internal resistance?

A convex lens of power 5D is placed at a distance of 30 cm from a screen. At what distance from the lens should the object be placed so that its image is formed on the screen? [3 MARKS]

The resistance of a wire is r Ω. The wire is stretched to double its length, then its resistance is

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

What is electromagnet and what is fuse? Define magnetic effect of current.

Why the bottom of the pool appears to be raised?

In which of the following solar cells are majorly used?

An object is placed 18 cm from a convex mirror of radius of curvature 18 cm. Find the position of image.

During the phase change, the temperature of the substance_____.

What do you think electrical energy actually is? For what do you pay electric bill ?

A body cools from 60∘C to 50∘C in 10 minutes when kept in air at 30∘C. In the next 10 minutes, its temperature will be

A sperical mirror produces an image of magnification -1 on a screen placed at a distance of 50 cm from the mirror write the type of mirror?

Can light be converted into mass?

What are condition when the light is in wave ,particle and Ray.

According to convention, the direction of flow of electric current is taken from the positive terminal to the negative terminal of a battery, which is opposite to the flow of ___.

A ray of light travelling in air is incident on the plane of a transparent medium. The angle of incidence is 45∘ and that of refraction is 30∘. Find the refractive index of the medium.

A force of 100 dynes acts on mass of 5 gm for 10 sec. The velocity produced is

The ejected electrons from the surface of metal in photoelectric effect are called

250 g of ice at 0 ∘C converts into water at 0 ∘C in a minute, when a constant heat is supplied. In how much time (sec) the water thus obtained will change to 20 ∘C? The specific latent heat of ice is 336 J g−1. The specific heat capacity of water is 4.2 J g−1 ∘C−1.

How a split ring works in a motor

With object at ∞, sort the focal lengths of the convex lenses as their image distance increases.

How were coal and petroleum formed? [1 MARK]

Although coal and petroleum are produced by the degradation of biomass, even then we need to conserve them. Why?

A block and tackle system of 5 pulleys is used to raise a load of 50 kgf steadily through a height of 20 m. The work done against friction is 2000J. Calculate the work done by the effort

What is the main purpose of water shed harvesting?

A lens forms an upright and diminshed image of an object placed at its focal point. Name the lens and draw a ray diagram to show the formation of image.

A meter rule can be balanced about 60 cm mark by placing a block of weight ‘m’ g at 90 cm mark. Express the mass of ruler ‘W’ in terms of mass of the block.

In an A.C. generator, the speed at which the coil rotates is doubled. How would this effect (a) the frequency of the output voltage, (b) the maximum output voltage?

Identify the condition which will form enlarged, virtual and erect image.

If the angle of incidence is at 30∘. Find the angle of deflection, after reflecting 2 times.

How can we transmit electricity wireless over long distance

The effective resistance in series combination is (A) smaller than the largest resistance (B) smaller than the smallest resistance (C) larger than the largest resistance (D) None of these.

Choose the correct option: 1.Tonei.frequencies that are integral multiple of fundamental frequency.2.Noteii.sound of single frequency.3.Overtoneiii.sound of multiple frequencies.4.Harmoniciv.higher frequencies other than fundamental frequency.

If the wavelength of a sound wave is 40 cm and the time period T = 0.005 s, how many seconds will it take to travel 4 km?

Why is electromagnetic induction so called ?

"The angle between the 2 lateral faces of the prism is called angle of the prism". What are the two lateral faces ?

Q20. Consider the following statements about Copernicus Programme: 1. Copernicus is the world’s largest single earth observation Programme. 2. It is directed by the European Commission in partnership with the European Space Agency. Which of the statements are correct?

Which part of retina has greater visual activity?

Write a short note on the pollution caused by burning fossil fuels.

What is the function of a resistor?

If AB = 10 cm &amp; DB = 40 cm (diameter). What is the radius of curvature &amp; focal length of the spherical glass?

A concave lens of focal length f forms an image which is n times the size of the object. The distance of the object from the lens is:

Question 6 A copper wire has diameter 0.5 mm and resistivity of 1.6×10−8 Ω m. What will be the length of this wire to make its resistance 10 Ω ? How much does the resistance change if the diameter is doubled?

Fill in the following blanks with suitable words : (a) The reciprocal of the focal length in metres gives you the of _the lens, which is measured in _ (b) For converging lenses, the power is _while for diverging lenses, the power is _.

If AB = 10 cm & DB = 40 cm (diameter). What is the radius of curvature & focal length of the spherical glass?