16569 + Interview Questions in Physics Page 41 InterviewSolution

2001.	In which of the following images, the angle of refraction is maximum?
Answer» In which of the following images, the angle of refraction is maximum?

Discussion

2002.	MCQ 1)Which fuel is obtained by decomposition of organic matter a)bio gas b)fossil fuel C)natural gas
Answer» MCQ 1)Which fuel is obtained by decomposition of organic matter a)bio gas b)fossil fuel C)natural gas

Discussion

2003.	Find the minimum and maximum wavelengths of sound in water that is in the audible range (20 - 20000 Hz) for an average human ear. Speed of sound in water = 1450 ms−1
Answer» Find the minimum and maximum wavelengths of sound in water that is in the audible range (20 - 20000 Hz) for an average human ear. Speed of sound in water = $1450 m s^{-} 1$

Discussion

2004.	What is a wavelengh
Answer» What is a wavelengh

Discussion

2005.	Use Snell's law to find the refractive index of an interface when the angle of incidence is 60∘ and the angle of refraction is 30∘.
Answer» Use Snell's law to find the refractive index of an interface when the angle of incidence is $60^{\circ}$ and the angle of refraction is $30^{\circ}$ .

Discussion

2006.	Define electrostatic induction.
Answer» Define electrostatic induction.

Discussion

2007.	39.Fund the current through the 10 ohm resistance connected across AB
Answer» 39.Fund the current through the 10 ohm resistance connected across AB

Discussion

2008.	Question 6The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem?
Answer» Question 6 The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem?

Discussion

2009.	22.Why electric field cannot pass through a conductor
Answer» 22.Why electric field cannot pass through a conductor

Discussion

2010.	In a household electric circuit different appliances are connected in parallel to one another. Give two reasons.An electrician puts a fuse of rating 5 A in that part of domestic electrical circuit in which an electric heater of rating 1.5 kW, 220 V is operating. What is likely to happen in this case and why? What change, if any, needs to be made?
Answer» In a household electric circuit different appliances are connected in parallel to one another. Give two reasons. An electrician puts a fuse of rating 5 A in that part of domestic electrical circuit in which an electric heater of rating 1.5 kW, 220 V is operating. What is likely to happen in this case and why? What change, if any, needs to be made?

Discussion

2011.	Thevalue of Plank's constant is 6.63 × 10-34 Js. The speed of light is3×1017 nm s-1. Which value is closest with frequency of6×1015 s-1 ?
Answer» The value of Plank's constant is 6.63 × 10^-34 Js. The speed of light is 3×10¹⁷ nm s^-1. Which value is closest with frequency of 6×10¹⁵ s^-1 ?

Discussion

2012.	if the source of wavelength 500nm is replaced by another source of wavelength 250nm but emitting same no. of photons in unit time , what change will occur in saturation photocurrent and stopping potential
Answer» if the source of wavelength 500nm is replaced by another source of wavelength 250nm but emitting same no. of photons in unit time , what change will occur in saturation photocurrent and stopping potential

Discussion

2013.	Which bulb will glow brighter, a 40 Watt bulb or a 60 watt when connected in series. Why?
Answer» Which bulb will glow brighter, a 40 Watt bulb or a 60 watt when connected in series. Why?

Discussion

2014.	The direction of current is opposite to the direction of the flow of electrons.so does this mean current is a vector quantity why or why not?
Answer» The direction of current is opposite to the direction of the flow of electrons.so does this mean current is a vector quantity why or why not?

Discussion

2015.	a thin wire is carrying current i is placed along positive diretion x axis.the unit vecor of magnetic field at point (0,a,a)
Answer» a thin wire is carrying current i is placed along positive diretion x axis.the unit vecor of magnetic field at point (0,a,a)

Discussion

2016.	Name the device used to (a)increase the voltage at the generating station ,and (b)decrease the voltage at the sub station for it's supply.
Answer» Name the device used to (a)increase the voltage at the generating station ,and (b)decrease the voltage at the sub station for it's supply.

Discussion

2017.	SunderlalBahuguna helped to start the 'Chipko movement' in
Answer» SunderlalBahuguna helped to start the 'Chipko movement' in

Discussion

2018.	38.The number of peaks obtained for 3d and 4s orbital respectively when a graph plotted radial probability function versus distance from the nucleus [r] is?
Answer» 38.The number of peaks obtained for 3d and 4s orbital respectively when a graph plotted radial probability function versus distance from the nucleus [r] is?

Discussion

2019.	22. Find the potential difference across A and B
Answer» 22. Find the potential difference across A and B

Discussion

2020.	23 In how many ways 5 rings of different types can be worn in 4 fingers
Answer» 23 In how many ways 5 rings of different types can be worn in 4 fingers

Discussion

2021.	Two bodies rotating with the same angular momentum have M.I. I1 and I2 respectively such as I1>I2 respectively, then
Answer» Two bodies rotating with the same angular momentum have M.I. $I_{1} a n d I_{2}$ respectively such as $I_{1} > I_{2}$ respectively, then

Discussion

2022.	In an experiment, a light ray is incident on the air-glass interface as shown in the figure. If the angle of incidence is 45∘ and angle of refraction is 30∘, then the speed of light in the glass is -
Answer» In an experiment, a light ray is incident on the air-glass interface as shown in the figure. If the angle of incidence is $45^{\circ}$ and angle of refraction is $30^{\circ}$ , then the speed of light in the glass is -

Discussion

2023.	(a) State four factors on which the resistance of a conductor depends.(b) A piece of wire of resistance 20 Ω is drawn out so that its length is increased to twice its original length. Calculate the resistance of the wire in the new situation.
Answer» (a) State four factors on which the resistance of a conductor depends. (b) A piece of wire of resistance 20 Ω is drawn out so that its length is increased to twice its original length. Calculate the resistance of the wire in the new situation.

Discussion

2024.	A terrestrial telescope has an objective lens and eyepiece of focal length 200 cm and 4 cm respectively. Separation between the objective lens and the eyepiece is 220 cm. The power of the erecting lens is n2 D. The value of n(integer only)
Answer» A terrestrial telescope has an objective lens and eyepiece of focal length $200 cm$ and $4 cm$ respectively. Separation between the objective lens and the eyepiece is $220 cm$ . The power of the erecting lens is $n^{2} D$ . The value of $n$ (integer only)

Discussion

2025.	How will you differentiate between a convex and a concave lens by looking at (i) a distant object, (ii) a printed page ?
Answer» How will you differentiate between a convex and a concave lens by looking at (i) a distant object, (ii) a printed page ?

Discussion

2026.	What do we mean by 1)Torque2) Disspated forces?
Answer» What do we mean by 1)Torque 2) Disspated forces?

Discussion

2027.	A convex lens of focal length F forms a virtual image, 3 times the size of object . The Distance of object from the lens is
Answer» A convex lens of focal length F forms a virtual image, 3 times the size of object . The Distance of object from the lens is

Discussion

2028.	The focal length of the eye lens changes due to the action of:
Answer» The focal length of the eye lens changes due to the action of:

Discussion

2029.	What are non-ohmic resistors ? Give one example and draw a graph to show its current voltage relationship.
Answer» What are non-ohmic resistors ? Give one example and draw a graph to show its current voltage relationship.

Discussion

2030.	ntA diverging meniscus lens of 1.5 refractive index has concave surface of radii 3 and 4 cm.The position of the image ,if an object is placed 12 cm in front of the lens isn nta)7 cmn ntb)-8 cmn ntc)9 cmn ntd)10 cmn
Answer» ntA diverging meniscus lens of 1.5 refractive index has concave surface of radii 3 and 4 cm.The position of the image ,if an object is placed 12 cm in front of the lens isn nta)7 cmn ntb)-8 cmn ntc)9 cmn ntd)10 cmn

Discussion

2031.	One side of a glass slab is silvered as shown in the figure. A ray of light is incident on the other side at an angle of incident of 45∘. Refractive index of glass is √2. The deflection suffered by the light ray when it comes out of slab will be
Answer» One side of a glass slab is silvered as shown in the figure. A ray of light is incident on the other side at an angle of incident of $45^{\circ}$ . Refractive index of glass is $\sqrt{2}$ . The deflection suffered by the light ray when it comes out of slab will be

Discussion

2032.	Describe the New Cartesian Sign Convention used in optics. Draw a labelled diagram to illustrate this sign convention.
Answer» Describe the New Cartesian Sign Convention used in optics. Draw a labelled diagram to illustrate this sign convention.

Discussion

2033.	tha angle of mimimum deviation for a 75 degree prism of dense glass is found to be 45 degree when in air and 15 degree when immersded in certain liquid. the refractive index of the liquid is
Answer» tha angle of mimimum deviation for a 75 degree prism of dense glass is found to be 45 degree when in air and 15 degree when immersded in certain liquid. the refractive index of the liquid is

Discussion

2034.	Name the lens/lenses which is/are being used in a refracting telescope?
Answer» Name the lens/lenses which is/are being used in a refracting telescope?

Discussion

2035.	For the same kinetic energy of a body, what should be the change in its velocity if its mass is increased to four times its original value?
Answer» For the same kinetic energy of a body, what should be the change in its velocity if its mass is increased to four times its original value?

Discussion

2036.	Question 18 (b)Explain:(b) Why are the conductors of electric heating devices, such as bread-toasters and electric irons, made of an alloy rather than a pure metal?
Answer» Question 18 (b) Explain: (b) Why are the conductors of electric heating devices, such as bread-toasters and electric irons, made of an alloy rather than a pure metal?

Discussion

2037.	Identify the condition in which image formed is real, inverted and diminished from the following.
Answer» Identify the condition in which image formed is real, inverted and diminished from the following.

Discussion

2038.	The eye can change the focal length of its lens. Which part of the eye is responsible for this? How does the changing focal length help us?
Answer» The eye can change the focal length of its lens. Which part of the eye is responsible for this? How does the changing focal length help us?

Discussion

2039.	14. If a copper wire is stretched to make its radius decrease by 0.1%,then the percentage increase in resistance is nearly
Answer» 14. If a copper wire is stretched to make its radius decrease by 0.1%,then the percentage increase in resistance is nearly

Discussion

2040.	A point object is placed at a distance of 15 cm from a convex lens. The image is formed on the other side at a distance of 30 cm from the lens. When a concave lens is placed in contact with the convex lens, the image shifts away further by 30 cm. Calculate the focal lengths of the two lenses.
Answer» A point object is placed at a distance of 15 cm from a convex lens. The image is formed on the other side at a distance of 30 cm from the lens. When a concave lens is placed in contact with the convex lens, the image shifts away further by 30 cm. Calculate the focal lengths of the two lenses.

Discussion

2041.	How do the input and output powers in a transformer compare? State the assumption made.
Answer» How do the input and output powers in a transformer compare? State the assumption made.

Discussion

2042.	The magnitude of the charge for a single electron or proton is 1.6×10−19C. What is the net charge of a particle that has 20 electrons and 22 protons?
Answer» The magnitude of the charge for a single electron or proton is $1.6 \times 10^{- 19} C$ . What is the net charge of a particle that has 20 electrons and 22 protons?

Discussion

2043.	What do you understand by the stability of atoms?
Answer» What do you understand by the stability of atoms?

Discussion

2044.	Find out the mass of Uranium required per day to generate 10 MW power from the fission of 92 U^235
Answer» Find out the mass of Uranium required per day to generate 10 MW power from the fission of 92 U^235

Discussion

2045.	The image of a candle formed by a convex lens is obtained on a screen. Will full size of the image be obtained if the lower half of the lens is painted completely opaque?
Answer» The image of a candle formed by a convex lens is obtained on a screen. Will full size of the image be obtained if the lower half of the lens is painted completely opaque?

Discussion

2046.	When two sound sources are sounded together then 2 beats is produced in 20 sec.find the frequency of beat
Answer» When two sound sources are sounded together then 2 beats is produced in 20 sec.find the frequency of beat

Discussion

2047.	A block of mass 6 kg is pushed on a smooth inclined plane of angle of inclination 30 degree with help of a force of magnitude 50 N along the plane. The acceleration of the block will be
Answer» A block of mass 6 kg is pushed on a smooth inclined plane of angle of inclination 30 degree with help of a force of magnitude 50 N along the plane. The acceleration of the block will be

Discussion

2048.	A velocity of flow of fluid of density 200 (kg/m3) is to be measured by the Pitot tube. If Pilot tube produces a differential pressure of 40 kN/m2 then the velocity of flow (in m/sec)20
Answer» A velocity of flow of fluid of density $200 (k g / m^{3})$ is to be measured by the Pitot tube. If Pilot tube produces a differential pressure of $40 k N / m^{2}$ then the velocity of flow $(i n m / s e c)$ 20

Discussion

2049.	The temperature of a black body increases from T to 2T. The factor by which the rate of emission will increase
Answer» The temperature of a black body increases from $T$ to $2 T$ . The factor by which the rate of emission will increase

Discussion

2050.	Which coloured light has largest wavelength in the visible spectrum?
Answer» Which coloured light has largest wavelength in the visible spectrum?

Discussion

Explore topic-wise InterviewSolutions in .

In which of the following images, the angle of refraction is maximum?

MCQ 1)Which fuel is obtained by decomposition of organic matter a)bio gas b)fossil fuel ​​​​C)natural gas ​​​​​

Find the minimum and maximum wavelengths of sound in water that is in the audible range (20 - 20000 Hz) for an average human ear. Speed of sound in water = 1450 ms−1

What is a wavelengh

Use Snell's law to find the refractive index of an interface when the angle of incidence is 60∘ and the angle of refraction is 30∘.

Define electrostatic induction.

39.Fund the current through the 10 ohm resistance connected across AB

Question 6The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem?

22.Why electric field cannot pass through a conductor

Thevalue of Plank's constant is 6.63 × 10-34 Js. The speed of light is3×1017 nm s-1. Which value is closest with frequency of6×1015 s-1 ?

if the source of wavelength 500nm is replaced by another source of wavelength 250nm but emitting same no. of photons in unit time , what change will occur in saturation photocurrent and stopping potential

Which bulb will glow brighter, a 40 Watt bulb or a 60 watt when connected in series. Why?

The direction of current is opposite to the direction of the flow of electrons.so does this mean current is a vector quantity why or why not?

a thin wire is carrying current i is placed along positive diretion x axis.the unit vecor of magnetic field at point (0,a,a)

Name the device used to (a)increase the voltage at the generating station ,and (b)decrease the voltage at the sub station for it's supply.

SunderlalBahuguna helped to start the 'Chipko movement' in

38.The number of peaks obtained for 3d and 4s orbital respectively when a graph plotted radial probability function versus distance from the nucleus [r] is?

22. Find the potential difference across A and B

23 In how many ways 5 rings of different types can be worn in 4 fingers

Two bodies rotating with the same angular momentum have M.I. I1 and I2 respectively such as I1&gt;I2 respectively, then

In an experiment, a light ray is incident on the air-glass interface as shown in the figure. If the angle of incidence is 45∘ and angle of refraction is 30∘, then the speed of light in the glass is -

(a) State four factors on which the resistance of a conductor depends.​(b) A piece of wire of resistance 20 Ω is drawn out so that its length is increased to twice its original length. Calculate the resistance of the wire in the new situation.

A terrestrial telescope has an objective lens and eyepiece of focal length 200 cm and 4 cm respectively. Separation between the objective lens and the eyepiece is 220 cm. The power of the erecting lens is n2 D. The value of n(integer only)

How will you differentiate between a convex and a concave lens by looking at (i) a distant object, (ii) a printed page ?

What do we mean by 1)Torque2) Disspated forces?

A convex lens of focal length F forms a virtual image, 3 times the size of object . The Distance of object from the lens is

The focal length of the eye lens changes due to the action of:

What are non-ohmic resistors ? Give one example and draw a graph to show its current voltage relationship.

ntA diverging meniscus lens of 1.5 refractive index has concave surface of radii 3 and 4 cm.The position of the image ,if an object is placed 12 cm in front of the lens isn nta)7 cmn ntb)-8 cmn ntc)9 cmn ntd)10 cmn

One side of a glass slab is silvered as shown in the figure. A ray of light is incident on the other side at an angle of incident of 45∘. Refractive index of glass is √2. The deflection suffered by the light ray when it comes out of slab will be

Describe the New Cartesian Sign Convention used in optics. Draw a labelled diagram to illustrate this sign convention.

tha angle of mimimum deviation for a 75 degree prism of dense glass is found to be 45 degree when in air and 15 degree when immersded in certain liquid. the refractive index of the liquid is

Name the lens/lenses which is/are being used in a refracting telescope?

For the same kinetic energy of a body, what should be the change in its velocity if its mass is increased to four times its original value?

Question 18 (b)Explain:(b) Why are the conductors of electric heating devices, such as bread-toasters and electric irons, made of an alloy rather than a pure metal?

Identify the condition in which image formed is real, inverted and diminished from the following.

The eye can change the focal length of its lens. Which part of the eye is responsible for this? How does the changing focal length help us?

14. If a copper wire is stretched to make its radius decrease by 0.1%,then the percentage increase in resistance is nearly

A point object is placed at a distance of 15 cm from a convex lens. The image is formed on the other side at a distance of 30 cm from the lens. When a concave lens is placed in contact with the convex lens, the image shifts away further by 30 cm. Calculate the focal lengths of the two lenses.

How do the input and output powers in a transformer compare? State the assumption made.

The magnitude of the charge for a single electron or proton is 1.6×10−19C. What is the net charge of a particle that has 20 electrons and 22 protons?

What do you understand by the stability of atoms?

Find out the mass of Uranium required per day to generate 10 MW power from the fission of 92 U^235

The image of a candle formed by a convex lens is obtained on a screen. Will full size of the image be obtained if the lower half of the lens is painted completely opaque?

When two sound sources are sounded together then 2 beats is produced in 20 sec.find the frequency of beat

A block of mass 6 kg is pushed on a smooth inclined plane of angle of inclination 30 degree with help of a force of magnitude 50 N along the plane. The acceleration of the block will be

A velocity of flow of fluid of density 200 (kg/m3) is to be measured by the Pitot tube. If Pilot tube produces a differential pressure of 40 kN/m2 then the velocity of flow (in m/sec)20

The temperature of a black body increases from T to 2T. The factor by which the rate of emission will increase

Which coloured light has largest wavelength in the visible spectrum?

MCQ 1)Which fuel is obtained by decomposition of organic matter a)bio gas b)fossil fuel C)natural gas

Two bodies rotating with the same angular momentum have M.I. I1 and I2 respectively such as I1>I2 respectively, then

(a) State four factors on which the resistance of a conductor depends.(b) A piece of wire of resistance 20 Ω is drawn out so that its length is increased to twice its original length. Calculate the resistance of the wire in the new situation.