16569 + Interview Questions in Physics

1.	Two resistors 2 Ω and 5 Ω are connected in series with a 7 V battery. Find the potential difference across the 5 Ω resistor.
Answer» Two resistors $2 Ω$ and $5 Ω$ are connected in series with a $7 V$ battery. Find the potential difference across the $5 Ω$ resistor.

1.

Two resistors 2 Ω and 5 Ω are connected in series with a 7 V battery. Find the potential difference across the 5 Ω resistor.

Answer»

Two resistors $2 Ω$ and $5 Ω$ are connected in series with a $7 V$ battery. Find the potential difference across the $5 Ω$ resistor.

Discussion

2.	There are two atoms A and B. The atomic number of A is 116 and the atomic number of B is 29. Which of them is more capable of undergoing nuclear fission reaction?
Answer» There are two atoms A and B. The atomic number of A is $116$ and the atomic number of B is $29$ . Which of them is more capable of undergoing nuclear fission reaction?

Discussion

3.	For the screw gauge shown below, the least count is 0.01 mm. What is the zero error?
Answer» For the screw gauge shown below, the least count is 0.01 mm. What is the zero error?

3.

For the screw gauge shown below, the least count is 0.01 mm. What is the zero error?

Answer»

For the screw gauge shown below, the least count is 0.01 mm. What is the zero error?

Discussion

4.	When we pass an electric current In a straight wire, it behaves like a magnet. Where are the south and the north poles located?
Answer» When we pass an electric current In a straight wire, it behaves like a magnet. Where are the south and the north poles located?

Discussion

5.	A farm that raises cattle for the meat industry depends on the forest for which purpose?
Answer» A farm that raises cattle for the meat industry depends on the forest for which purpose?

Discussion

6.	The function of an ___ is to regulate the electric current as the need be, without the loss of power.
Answer» The function of an ___ is to regulate the electric current as the need be, without the loss of power.

Discussion

7.	Q20. Consider the following statements 1. Delhi became the first city in India to supply ultra-clean Bharat Stage (BS) VI grade fuel. 2. The major difference in standards between the existing BS-IV and new BS-VI auto fuel norms is presence of sulphur. Which of the statements are correct?
Answer» Q20. Consider the following statements 1. Delhi became the first city in India to supply ultra-clean Bharat Stage (BS) VI grade fuel. 2. The major difference in standards between the existing BS-IV and new BS-VI auto fuel norms is presence of sulphur. Which of the statements are correct?

7.

Q20. Consider the following statements 1. Delhi became the first city in India to supply ultra-clean Bharat Stage (BS) VI grade fuel. 2. The major difference in standards between the existing BS-IV and new BS-VI auto fuel norms is presence of sulphur. Which of the statements are correct?

Answer»

Q20. Consider the following statements

1. Delhi became the first city in India to supply ultra-clean Bharat Stage (BS) VI grade fuel.

2. The major difference in standards between the existing BS-IV and new BS-VI auto fuel norms is presence of sulphur.

Which of the statements are correct?

Discussion

8.	An object of height 2.5 cm is placed at a distance of 15 cm from the optical centre 'O' of a convex lens of focal length 10 cm. Draw a ray diagram to find the position and size of the image formed. Mark optical centre 'O', principal focus F and height of the image on the diagram.
Answer» An object of height 2.5 cm is placed at a distance of 15 cm from the optical centre 'O' of a convex lens of focal length 10 cm. Draw a ray diagram to find the position and size of the image formed. Mark optical centre 'O', principal focus F and height of the image on the diagram.

Discussion

9.	A lens having two spherical surfaces, both bulging outward is called ______________?
Answer» A lens having two spherical surfaces, both bulging outward is called ______________?

Discussion

10.	Why is LPG considered a better fuel than coal?
Answer» Why is LPG considered a better fuel than coal?

Discussion

11.	(a) What is biogas ? Name the major component of biogas. (b) What are the raw materials used for making biogas ? (c) Describe the construction and working of a biogas plant with the help of a labelled diagram. (d) Write any two uses of biogas. (e) Write any two advantages of using biogas.
Answer» (a) What is biogas ? Name the major component of biogas. (b) What are the raw materials used for making biogas ? (c) Describe the construction and working of a biogas plant with the help of a labelled diagram. (d) Write any two uses of biogas. (e) Write any two advantages of using biogas.

Discussion

12.	Show by a diagram how resistors R1,R2 and R3 are joined in parallel. Obtain an expression for the total resistance of the combination. [5 MARKS]
Answer» Show by a diagram how resistors $R_{1}, R_{2} a n d R_{3}$ are joined in parallel. Obtain an expression for the total resistance of the combination. [5 MARKS]

Discussion

13.	Fill in the following blanks with suitable words : (a) A convex lens ___ rays of light, whereas a concave lens___ rays of light. (b) Lenses refract light to form images : a ___lens can form both real and virtual images, but a diverging lens forms only___ images.
Answer» Fill in the following blanks with suitable words : (a) A convex lens ___ rays of light, whereas a concave lens___ rays of light. (b) Lenses refract light to form images : a ___lens can form both real and virtual images, but a diverging lens forms only___ images.

Discussion

14.	Which among the following is the source of ultraviolet rays?
Answer» Which among the following is the source of ultraviolet rays?

Discussion

15.	The stabilization of a dispered phase in a lyophobic colloid is due to:
Answer» The stabilization of a dispered phase in a lyophobic colloid is due to:

Discussion

16.	Define the term heat capacity and state its S.I.unit.
Answer» Define the term heat capacity and state its S.I.unit.

Discussion

17.	Why does the sun appear yellowish-white at the noon?
Answer» Why does the sun appear yellowish-white at the noon?

Discussion

18.	Copy this figure in your answer book and show the direction of the light ray after reflection :
Answer» Copy this figure in your answer book and show the direction of the light ray after reflection :

18.

Copy this figure in your answer book and show the direction of the light ray after reflection :

Answer»

Copy this figure in your answer book and show the direction of the light ray after reflection :

Discussion

19.	(a) What is a real image? (b) What type of mirror can be used to obtain a real image of an object? (c) Does the mirror mentioned in part (b) form real image for all locations of the object?
Answer» (a) What is a real image? (b) What type of mirror can be used to obtain a real image of an object? (c) Does the mirror mentioned in part (b) form real image for all locations of the object?

19.

(a) What is a real image? (b) What type of mirror can be used to obtain a real image of an object? (c) Does the mirror mentioned in part (b) form real image for all locations of the object?

Answer»

(a) What is a real image?

(b) What type of mirror can be used to obtain a real image of an object?

(c) Does the mirror mentioned in part (b) form real image for all locations of the object?

Discussion

20.	A metal of mass 200 g is kept at its melting point 800∘C. It freezes at the same temperature releasing about 30 kJ of energy. Find the specific latent heat of the metal in J g−1.150
Answer» A metal of mass $200 g$ is kept at its melting point $800^{\circ} C$ . It freezes at the same temperature releasing about $30 kJ$ of energy. Find the specific latent heat of the metal in ${J g}^{- 1}$ . 150

Discussion

21.	The following table gives the refractive indices of a few media : 12345Medium:WaterCrown glassRock saltRubyDiamondRefreactive index:1.331.521.541.712.42 Use this table to give an example of : (i) a medium pair so that light speeds up when it goes from one of these medium to another. (it) a medium pair so that light slows down when it goes from one of these medium to another.
Answer» The following table gives the refractive indices of a few media : $\begin{matrix} 1 & 2 & 3 & 4 & 5 M e d i u m : & W a t e r & C r o w n g l a s s & R o c k s a l t & R u b y & D i a m o n d R e f r e a c t i v e i n d e x : & 1.33 & 1.52 & 1.54 & 1.71 & 2.42 \end{matrix}$ Use this table to give an example of : (i) a medium pair so that light speeds up when it goes from one of these medium to another. (it) a medium pair so that light slows down when it goes from one of these medium to another.

21.

The following table gives the refractive indices of a few media : 12345Medium:WaterCrown glassRock saltRubyDiamondRefreactive index:1.331.521.541.712.42 Use this table to give an example of : (i) a medium pair so that light speeds up when it goes from one of these medium to another. (it) a medium pair so that light slows down when it goes from one of these medium to another.

Answer»

The following table gives the refractive indices of a few media : $\begin{matrix} 1 & 2 & 3 & 4 & 5 M e d i u m : & W a t e r & C r o w n g l a s s & R o c k s a l t & R u b y & D i a m o n d R e f r e a c t i v e i n d e x : & 1.33 & 1.52 & 1.54 & 1.71 & 2.42 \end{matrix}$

Use this table to give an example of : (i) a medium pair so that light speeds up when it goes from one of these medium to another. (it) a medium pair so that light slows down when it goes from one of these medium to another.

Discussion

22.	Which of the following colour of white light has the least wavelength ? (a) red (b) orange (c) violet (d) blue
Answer» Which of the following colour of white light has the least wavelength ? (a) red (b) orange (c) violet (d) blue

Discussion

23.	How do eye focus objects at different distances ?
Answer» How do eye focus objects at different distances ?

Discussion

24.	What is the value of acceleration due to gravity on the moon? (g is the acceleration due to gravity on the Earth)
Answer» What is the value of acceleration due to gravity on the moon? ( $g$ is the acceleration due to gravity on the Earth)

24.

What is the value of acceleration due to gravity on the moon? (g is the acceleration due to gravity on the Earth)

Answer»

What is the value of acceleration due to gravity on the moon?

( $g$ is the acceleration due to gravity on the Earth)

Discussion

25.	A wheel of diameter 2 m is shown in the figure with an axle at O. A force F = 2 N is applied at B in the direction shown in figure. Calculate the moment of force about (i) the centre O, and (ii) the point A.
Answer» A wheel of diameter 2 m is shown in the figure with an axle at O. A force F = 2 N is applied at B in the direction shown in figure. Calculate the moment of force about (i) the centre O, and (ii) the point A.

25.

A wheel of diameter 2 m is shown in the figure with an axle at O. A force F = 2 N is applied at B in the direction shown in figure. Calculate the moment of force about (i) the centre O, and (ii) the point A.

Answer»

A wheel of diameter 2 m is shown in the figure with an axle at O. A force F = 2 N is applied at B in the direction shown in figure. Calculate the moment of force about (i) the centre O, and (ii) the point A.

Discussion

26.	Why sky is blue
Answer» Why sky is blue

Discussion

27.	When does light behave as a ray?
Answer» When does light behave as a ray?

Discussion

28.	The speed of light in air is: (a) 3×108 cm/s (b) 3×108 mm/s (c) 3×108 km/s (d) 3×108 m/s
Answer» The speed of light in air is: (a) $3 \times 10^{8} c m / s$ (b) $3 \times 10^{8} m m / s$ (c) $3 \times 10^{8} k m / s$ (d) $3 \times 10^{8} m / s$

Discussion

29.	A radium source which emits α, β and gamma radiations is placed in a lead block. The beam of radiations emitted is split into thre parts by a strong magnetic field. Which type of radiations is responsible for each of the marks X, Y and Z in this figure and differentiate with respect to charge, and nature.
Answer» A radium source which emits α, β and gamma radiations is placed in a lead block. The beam of radiations emitted is split into thre parts by a strong magnetic field. Which type of radiations is responsible for each of the marks X, Y and Z in this figure and differentiate with respect to charge, and nature.

29.

A radium source which emits α, β and gamma radiations is placed in a lead block. The beam of radiations emitted is split into thre parts by a strong magnetic field. Which type of radiations is responsible for each of the marks X, Y and Z in this figure and differentiate with respect to charge, and nature.

Answer»

A radium source which emits α, β and gamma radiations is placed in a lead block. The beam of radiations emitted is split into thre parts by a strong magnetic field. Which type of radiations is responsible for each of the marks X, Y and Z in this figure and differentiate with respect to charge, and nature.

Discussion

30.	A conductor is carrying a current(shown in black), and a magnet is placed next to it as shown. Now it is known that the magnet moves away from you perpendicular to the plane. What should be the current in another wire (shown in green) in order to keep the magnet in place? (Consider the force only on the north pole)
Answer» A conductor is carrying a current(shown in black), and a magnet is placed next to it as shown. Now it is known that the magnet moves away from you perpendicular to the plane. What should be the current in another wire (shown in green) in order to keep the magnet in place? (Consider the force only on the north pole)

Discussion

31.	The importance of glass enclosure in incandescent bulb is
Answer» The importance of glass enclosure in incandescent bulb is

Discussion

32.	A postage stamp appears raised by 7.0 mm when placed under a rectangular glass block of refractive index 1.5. The thickness of the glass block is
Answer» A postage stamp appears raised by 7.0 mm when placed under a rectangular glass block of refractive index 1.5. The thickness of the glass block is

Discussion

33.	A small amount of ice is placed in water at 00C. It is observed that small amount of water freezes (i.e., amount of ice increases). Why?
Answer» A small amount of ice is placed in water at 0⁰C. It is observed that small amount of water freezes (i.e., amount of ice increases). Why?

Discussion

34.	Define rectilinear propagation of light.
Answer» Define rectilinear propagation of light.

Discussion

35.	A wire of resistance R is bent in form of a closed circle, what is the resistance across a diameter of the circle?
Answer» A wire of resistance R is bent in form of a closed circle, what is the resistance across a diameter of the circle?

Discussion

36.	Why is electroplating done?
Answer» Why is electroplating done?

Discussion

37.	Statement 1: When iron fillings are spread around a magnet, they align themselves as shown. Statement 2: Magnetic field of the magnet, apply force on each filing which makes them get oriented in the mentioned way.
Answer» Statement 1: When iron fillings are spread around a magnet, they align themselves as shown. Statement 2: Magnetic field of the magnet, apply force on each filing which makes them get oriented in the mentioned way.

37.

Statement 1: When iron fillings are spread around a magnet, they align themselves as shown. Statement 2: Magnetic field of the magnet, apply force on each filing which makes them get oriented in the mentioned way.

Answer»

Statement 1: When iron fillings are spread around a magnet, they align themselves as shown.

Statement 2: Magnetic field of the magnet, apply force on each filing which makes them get oriented in the mentioned way.

Discussion

38.	For the circuit given below choose the correct options, (Given: 'r' is the internal resistance of the cell connected to an external resistor 'R')
Answer» For the circuit given below choose the correct options, (Given: 'r' is the internal resistance of the cell connected to an external resistor 'R')

38.

For the circuit given below choose the correct options, (Given: 'r' is the internal resistance of the cell connected to an external resistor 'R')

Answer»

For the circuit given below choose the correct options, (Given: 'r' is the internal resistance of the cell connected to an external resistor 'R')

Discussion

39.	Why pure iron is not used to make permanent magnets? Suggest one material used to make permanent magnets.
Answer» Why pure iron is not used to make permanent magnets? Suggest one material used to make permanent magnets.

Discussion

40.	What is principal of moments
Answer» What is principal of moments

Discussion

41.	How do neutrons prevent repulsion of two or more protons in the nucleus of an atom?
Answer» How do neutrons prevent repulsion of two or more protons in the nucleus of an atom?

Discussion

42.	Why is convex mirror know as diverging
Answer» Why is convex mirror know as diverging

Discussion

43.	The dholes live in packs of _____which consist of old females, males, females and pups.
Answer» The dholes live in packs of _____which consist of old females, males, females and pups.

Discussion

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

Discussion

45.	If one builds a turbine in a fast flowing stream of river without building dam. What energy conversion will happen for power generation?
Answer» If one builds a turbine in a fast flowing stream of river without building dam. What energy conversion will happen for power generation?

Discussion

46.	Power of a lens is
Answer» Power of a lens is

Discussion

47.	Question 2 An electric lamp of 100Ω, a toaster of resistance 50Ω, and a water filter of resistance 500Ω are connected in parallel to a 220 V source. What is the resistance of an electric iron connected to the same source that takes as much current as all three appliances, and what is the current through it?
Answer» Question 2 An electric lamp of $100 Ω$ , a toaster of resistance $50 Ω$ , and a water filter of resistance $500 Ω$ are connected in parallel to a 220 V source. What is the resistance of an electric iron connected to the same source that takes as much current as all three appliances, and what is the current through it?

Discussion

48.	The image formed in a plane mirror is _____
Answer» The image formed in a plane mirror is _____

Discussion

49.	The average distance between the Mercury and Neptune is 29.7 AU. Express this distance in kilometers.
Answer» The average distance between the Mercury and Neptune is 29.7 AU. Express this distance in kilometers.

Discussion

50.	What are the characteristic(s) of a wave?
Answer» What are the characteristic(s) of a wave?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Two resistors 2 Ω and 5 Ω are connected in series with a 7 V battery. Find the potential difference across the 5 Ω resistor.

There are two atoms A and B. The atomic number of A is 116 and the atomic number of B is 29. Which of them is more capable of undergoing nuclear fission reaction?

For the screw gauge shown below, the least count is 0.01 mm. What is the zero error?

When we pass an electric current In a straight wire, it behaves like a magnet. Where are the south and the north poles located?

A farm that raises cattle for the meat industry depends on the forest for which purpose?

The function of an ___ is to regulate the electric current as the need be, without the loss of power.

Q20. Consider the following statements 1. Delhi became the first city in India to supply ultra-clean Bharat Stage (BS) VI grade fuel. 2. The major difference in standards between the existing BS-IV and new BS-VI auto fuel norms is presence of sulphur. Which of the statements are correct?

An object of height 2.5 cm is placed at a distance of 15 cm from the optical centre 'O' of a convex lens of focal length 10 cm. Draw a ray diagram to find the position and size of the image formed. Mark optical centre 'O', principal focus F and height of the image on the diagram.

A lens having two spherical surfaces, both bulging outward is called ______________?

Why is LPG considered a better fuel than coal?

(a) What is biogas ? Name the major component of biogas. (b) What are the raw materials used for making biogas ? (c) Describe the construction and working of a biogas plant with the help of a labelled diagram. (d) Write any two uses of biogas. (e) Write any two advantages of using biogas.

Show by a diagram how resistors R1,R2 and R3 are joined in parallel. Obtain an expression for the total resistance of the combination. [5 MARKS]

Fill in the following blanks with suitable words : (a) A convex lens ___ rays of light, whereas a concave lens___ rays of light. (b) Lenses refract light to form images : a ___lens can form both real and virtual images, but a diverging lens forms only___ images.

Which among the following is the source of ultraviolet rays?

The stabilization of a dispered phase in a lyophobic colloid is due to:

Define the term heat capacity and state its S.I.unit.

Why does the sun appear yellowish-white at the noon?

Copy this figure in your answer book and show the direction of the light ray after reflection :

(a) What is a real image? (b) What type of mirror can be used to obtain a real image of an object? (c) Does the mirror mentioned in part (b) form real image for all locations of the object?

A metal of mass 200 g is kept at its melting point 800∘C. It freezes at the same temperature releasing about 30 kJ of energy. Find the specific latent heat of the metal in J g−1.150

Which of the following colour of white light has the least wavelength ? (a) red (b) orange (c) violet (d) blue

How do eye focus objects at different distances ?

What is the value of acceleration due to gravity on the moon? (g is the acceleration due to gravity on the Earth)

A wheel of diameter 2 m is shown in the figure with an axle at O. A force F = 2 N is applied at B in the direction shown in figure. Calculate the moment of force about (i) the centre O, and (ii) the point A.

Why sky is blue

When does light behave as a ray?

The speed of light in air is: (a) 3×108 cm/s (b) 3×108 mm/s (c) 3×108 km/s (d) 3×108 m/s

The importance of glass enclosure in incandescent bulb is

A postage stamp appears raised by 7.0 mm when placed under a rectangular glass block of refractive index 1.5. The thickness of the glass block is

A small amount of ice is placed in water at 00C. It is observed that small amount of water freezes (i.e., amount of ice increases). Why?

Define rectilinear propagation of light.

A wire of resistance R is bent in form of a closed circle, what is the resistance across a diameter of the circle?

Why is electroplating done?

Statement 1: When iron fillings are spread around a magnet, they align themselves as shown. Statement 2: Magnetic field of the magnet, apply force on each filing which makes them get oriented in the mentioned way.

For the circuit given below choose the correct options, (Given: 'r' is the internal resistance of the cell connected to an external resistor 'R')

Why pure iron is not used to make permanent magnets? Suggest one material used to make permanent magnets.

What is principal of moments

How do neutrons prevent repulsion of two or more protons in the nucleus of an atom?

Why is convex mirror know as diverging

The dholes live in packs of _____which consist of old females, males, females and pups.

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

If one builds a turbine in a fast flowing stream of river without building dam. What energy conversion will happen for power generation?

Power of a lens is

The image formed in a plane mirror is _____

The average distance between the Mercury and Neptune is 29.7 AU. Express this distance in kilometers.

What are the characteristic(s) of a wave?

Fill in the following blanks with suitable words : (a) A convex lens _ rays of light, whereas a concave lens_ rays of light. (b) Lenses refract light to form images : a _lens can form both real and virtual images, but a diverging lens forms only_ images.