16569 + Interview Questions in Physics

1.	How to make home made rechargable battery?
Answer» How to make home made rechargable battery?

Discussion

2.	A convex lens is a ________ and a concave lens is a _________.
Answer» A convex lens is a ________ and a concave lens is a _________.

Discussion

3.	Question 10How many 176Ω resistors (in parallel) are required to carry 5 A on a 220 V line?
Answer» Question 10 How many $176 Ω$ resistors (in parallel) are required to carry 5 A on a 220 V line?

Discussion

4.	Whitaker evolved from a Naturalist to Conservationist because he realized that(a) Naturalists get obsessed with animals(b) It was the requirement of Rolex award(c) Conservationist has more importance than naturalist(d) Animals cannot be saved without saving their habitat
Answer» Whitaker evolved from a Naturalist to Conservationist because he realized that (a) Naturalists get obsessed with animals (b) It was the requirement of Rolex award (c) Conservationist has more importance than naturalist (d) Animals cannot be saved without saving their habitat

4.

Whitaker evolved from a Naturalist to Conservationist because he realized that(a) Naturalists get obsessed with animals(b) It was the requirement of Rolex award(c) Conservationist has more importance than naturalist(d) Animals cannot be saved without saving their habitat

Answer»

Whitaker evolved from a Naturalist to Conservationist because he realized that

(a) Naturalists get obsessed with animals

(b) It was the requirement of Rolex award

(c) Conservationist has more importance than naturalist

(d) Animals cannot be saved without saving their habitat

Discussion

5.	ntHYDRAZENE can be used in fuel cell N2H4(aq) + O2(aq)=N2(g)+2H2O(liq).If delta G for this reaction is -600KJ,What will be the E for the cell?n
Answer» ntHYDRAZENE can be used in fuel cell N2H4(aq) + O2(aq)=N2(g)+2H2O(liq).If delta G for this reaction is -600KJ,What will be the E for the cell?n

Discussion

6.	Two masses of 0.25 kg moving towards each other with speed 3 and 1 m/s collide and stick together Find the final velocity
Answer» Two masses of 0.25 kg moving towards each other with speed 3 and 1 m/s collide and stick together Find the final velocity

Discussion

7.	In an ideal Bryaton ccle, atmospheric air (ratio of specific heats, cp/cv=1.4 specifci heat at constant pressure =1.005kJ/kgK) at 1 bar adn 300K is compressed to 8 bar. The maximum temperature in the cycle is limited to 1280K. If the heat is suppied at hte rate of 80MW, the mass flow rate (in kg/s) of air required in the cycle is108.07
Answer» In an ideal Bryaton ccle, atmospheric air (ratio of specific heats, $c_{p} / c_{v} = 1.4$ specifci heat at constant pressure $= 1.005 k J / k g K$ ) at $1$ bar adn $300 K$ is compressed to $8$ bar. The maximum temperature in the cycle is limited to $1280 K$ . If the heat is suppied at hte rate of $80 M W$ , the mass flow rate (in $k g / s$ ) of air required in the cycle is 108.07

Discussion

8.	(a) Describe briefly one way of producing an induced e.m.f. (b) State one factor that determines the magnitude of induced e.m.f. in part (a) above. (c) What factor determines the direction of induced e.m.f. in part (a) above?
Answer» (a) Describe briefly one way of producing an induced e.m.f. (b) State one factor that determines the magnitude of induced e.m.f. in part (a) above. (c) What factor determines the direction of induced e.m.f. in part (a) above?

Discussion

9.	Calculate the approximate temperature of 27∘C in Kelvin.
Answer» Calculate the approximate temperature of 27 $^{\circ} C$ in Kelvin.

Discussion

10.	Find the angle between the emergent ray and incident ray when the light goes from air to glass slab. Given μglass = 1.5
Answer» Find the angle between the emergent ray and incident ray when the light goes from air to glass slab. Given $μ_{g l a s s}$ = $1.5$

10.

Find the angle between the emergent ray and incident ray when the light goes from air to glass slab. Given μglass = 1.5

Answer»

Find the angle between the emergent ray and incident ray when the light goes from air to glass slab. Given $μ_{g l a s s}$ = $1.5$

Discussion

11.	5."A source of unknown frequency gives 4 beats/Sec when sounded with a source of unknown frequency gives 5 beats/sec when sounded with a source of frequency 513 HZ.the unknown frequency is a)240 b)246
Answer» 5."A source of unknown frequency gives 4 beats/Sec when sounded with a source of unknown frequency gives 5 beats/sec when sounded with a source of frequency 513 HZ.the unknown frequency is a)240 b)246

Discussion

12.	Light from a denser medium 1 passes to a rarer medium 2. When the angle of incidence is θ, the partially reflected and refracted rays are mutually perpendicular. The critical angle will be
Answer» Light from a denser medium 1 passes to a rarer medium 2. When the angle of incidence is $θ$ , the partially reflected and refracted rays are mutually perpendicular. The critical angle will be

Discussion

13.	An electric motor is a device which transforms : (a) mechanical energy to electrical energy (b) heat energy to electrical energy (c) electrical energy to heat energy only (d) electrical energy to mechanical energy
Answer» An electric motor is a device which transforms : (a) mechanical energy to electrical energy (b) heat energy to electrical energy (c) electrical energy to heat energy only (d) electrical energy to mechanical energy

13.

An electric motor is a device which transforms : (a) mechanical energy to electrical energy (b) heat energy to electrical energy (c) electrical energy to heat energy only (d) electrical energy to mechanical energy

Answer»

An electric motor is a device which transforms :

(a) mechanical energy to electrical energy

(b) heat energy to electrical energy

(c) electrical energy to heat energy only

(d) electrical energy to mechanical energy

Discussion

14.	The eye can control the amount of light falling on the retina. Which part of the eye is responsible for this?
Answer» The eye can control the amount of light falling on the retina. Which part of the eye is responsible for this?

Discussion

15.	The length of a Galilean telescope is 33 cm when focused to form an image at infinity. If the objective lens has a focal length of 35 cm, what is the focal length of the eyepiece?
Answer» The length of a Galilean telescope is $33 cm$ when focused to form an image at infinity. If the objective lens has a focal length of $35 cm$ , what is the focal length of the eyepiece?

Discussion

16.	With the help of suitable diagram, explain the phenomenon of early sunrise and delayed sunset.
Answer» With the help of suitable diagram, explain the phenomenon of early sunrise and delayed sunset.

Discussion

17.	If the work done to transfer 10 C of charge between two bodies A and B is 10 joules then find the potential difference between them.
Answer» If the work done to transfer 10 C of charge between two bodies A and B is 10 joules then find the potential difference between them.

Discussion

18.	What is the meaning of positron (antielectron)
Answer» What is the meaning of positron (antielectron)

Discussion

19.	In ..................... combination of resistors, the total resistance is more than the highest resistance. __
Answer» In ..................... combination of resistors, the total resistance is more than the highest resistance. __

Discussion

20.	Why don’t two magnetic lines of force intersect each other?
Answer» Why don’t two magnetic lines of force intersect each other?

Discussion

21.	If a bar magnet is given a shape like V on one pole and another pole remain as it is then how will north and south pole will exist.
Answer» If a bar magnet is given a shape like V on one pole and another pole remain as it is then how will north and south pole will exist.

Discussion

22.	A solid metallic sphere is placed in a uniform electric field. Which of the following curves shown represent the lines of force correctly?
Answer» A solid metallic sphere is placed in a uniform electric field. Which of the following curves shown represent the lines of force correctly?

Discussion

23.	Describe in brief how would you determine the approximate focal length of a convex lens.
Answer» Describe in brief how would you determine the approximate focal length of a convex lens.

Discussion

24.	A bar magnet falls with its North Pole pointing down through the axis of a copper ring. When viewed from above, the current in the ring will be
Answer» A bar magnet falls with its North Pole pointing down through the axis of a copper ring. When viewed from above, the current in the ring will be

Discussion

25.	An electric refrigerator rated 500W operates 24 hours/day. What is the cost of the energy to operate it for 20 days at rupees 2.00 per kWh.
Answer» An electric refrigerator rated 500W operates 24 hours/day. What is the cost of the energy to operate it for 20 days at rupees 2.00 per kWh.

Discussion

26.	For a normal eye,the cornea of eye provides a converging power of 40 D and the least converging power of the eye lens behind the cornea is 20D . using this information ,the distance between the retina and the cornea-eye lens can be estimated
Answer» For a normal eye,the cornea of eye provides a converging power of 40 D and the least converging power of the eye lens behind the cornea is 20D . using this information ,the distance between the retina and the cornea-eye lens can be estimated

Discussion

27.	A FM radio station broadcast at a frequency of 103.1 MHz. What is the wavelength of these radio waves?
Answer» A FM radio station broadcast at a frequency of 103.1 MHz. What is the wavelength of these radio waves?

Discussion

28.	standing waves are produced on a string. If the wave velocity is 50m/s and minimum time interval bw two instants when the string is flat is 0.1s, distance bw 2 consecutive nodes is?
Answer» standing waves are produced on a string. If the wave velocity is 50m/s and minimum time interval bw two instants when the string is flat is 0.1s, distance bw 2 consecutive nodes is?

Discussion

29.	A block of mass 5 kg is pushed up 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 5 kg is pushed up 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

30.	In the figure shown below, find the minimum value of i for which total internal reflection never takes place at P.[Medium surrounding the slab has refractive index μ2]
Answer» In the figure shown below, find the minimum value of $i$ for which total internal reflection never takes place at $P$ . [Medium surrounding the slab has refractive index $μ_{2}$ ]

Discussion

31.	A solenoid of length 0.4 m and diameter 0.6 m consists of a single layer of 1000 turns of fine wire carrying a current of 5.0 mA. Find the magnetic field on the axis at the ends of the solenoid.[Take, μ0=4π×10−7 Tm A−1]
Answer» A solenoid of length $0.4 m$ and diameter $0.6 m$ consists of a single layer of $1000$ turns of fine wire carrying a current of $5.0 mA .$ Find the magnetic field on the axis at the ends of the solenoid. [Take, $μ_{0} = 4 π \times 10^{- 7} {Tm A}^{- 1}$ ]

Discussion

32.	Find the reminder when67 to the power67 is divided by 5
Answer» Find the reminder when67 to the power67 is divided by 5

Discussion

33.	A hydrogen atom moves with a velocity u, and makes a head on perfectly inelastic collision with another stationary hydrogen atom. Both the hydrogen atom are in the ground state before collision. What is the minimum value of u, if one of them is to be given a minimum excitation energy?The ionization energy of hydrogen atom is 13.6 eV. Mass of the hydrogen atom is 1.67×10−27 kg.
Answer» A hydrogen atom moves with a velocity $u$ , and makes a head on perfectly inelastic collision with another stationary hydrogen atom. Both the hydrogen atom are in the ground state before collision. What is the minimum value of $u$ , if one of them is to be given a minimum excitation energy? The ionization energy of hydrogen atom is $13.6 eV$ . Mass of the hydrogen atom is $1.67 \times 10^{- 27} kg$ .

Discussion

34.	15. which is false about lithium 1)most electronegative among alkali metals 2)forms peroxide but not superoxide
Answer» 15. which is false about lithium 1)most electronegative among alkali metals 2)forms peroxide but not superoxide

Discussion

35.	At 27^0C a sample of ammonia gas exerts a pressure of s5.3atm .What is the pressure when the volume of the gas is reduced to one tenth of the original value at the same temperature
Answer» At 27^0C a sample of ammonia gas exerts a pressure of s5.3atm .What is the pressure when the volume of the gas is reduced to one tenth of the original value at the same temperature

Discussion

36.	Two planets move around the sun. The time periods and the mean radii of the orbits are T1,T2 and r1,r2 respectively. The ratio T1T2 is equal to
Answer» Two planets move around the sun. The time periods and the mean radii of the orbits are $T_{1}, T_{2} a n d r_{1}, r_{2}$ respectively. The ratio $\frac{T_{1}}{T_{2}}$ is equal to

Discussion

37.	In the electroplating process, the object to be electroplated is used as___
Answer» In the electroplating process, the object to be electroplated is used as___

Discussion

38.	70.system is shown in the fig. light rays from a point obj are first deviated by a prism and then focussed by a thin lens of focal length f. the prism is made of material with refractive index 3/2 and has a small apex 2 degree ie small angle approximations are valid sin(alpha) =alpha and sin (alpha+beta)= alpha +beta where alpha and beta are angles. the final image is 1) virtual and formed at a distance of 2f from lens 2) real &formed at a distance of 2f from lens 3)real & formed at a distance of 3f/2 from lens 4) real and formed a distance of 3f from the lens
Answer» 70.system is shown in the fig. light rays from a point obj are first deviated by a prism and then focussed by a thin lens of focal length f. the prism is made of material with refractive index 3/2 and has a small apex 2 degree ie small angle approximations are valid sin(alpha) =alpha and sin (alpha+beta)= alpha +beta where alpha and beta are angles. the final image is 1) virtual and formed at a distance of 2f from lens 2) real &formed at a distance of 2f from lens 3)real & formed at a distance of 3f/2 from lens 4) real and formed a distance of 3f from the lens

Discussion

39.	A ray of light falls on the plane surface of a half cylinder at an angle 45∘ in the plane perpendicular to the axis (see figure). Refractive index of glass is √2 and radius of cylinder is √3 m. The value of OP in critical case is
Answer» A ray of light falls on the plane surface of a half cylinder at an angle $45^{\circ}$ in the plane perpendicular to the axis (see figure). Refractive index of glass is $\sqrt{2}$ and radius of cylinder is $\sqrt{3} m$ . The value of $OP$ in critical case is

Discussion

40.	The reason why the earth wire is used is:
Answer» The reason why the earth wire is used is:

Discussion

41.	One face of a rectangular glass plate 6 cm thick is silvered. An object held 8 cm in front of the first face, forms an image 12 cm behind the silvered face. The refractive index of the glass is :
Answer» One face of a rectangular glass plate 6 cm thick is silvered. An object held 8 cm in front of the first face, forms an image 12 cm behind the silvered face. The refractive index of the glass is :

Discussion

42.	An empty vessel is partially filled with water, then the frequency of vibration of air column in the vessel
Answer» An empty vessel is partially filled with water, then the frequency of vibration of air column in the vessel

Discussion

43.	Nowadays we are using alternate or non-conventional sources of energy more. Why?
Answer» Nowadays we are using alternate or non-conventional sources of energy more. Why?

Discussion

44.	In the nuclear reactor of a power plant : (a) how do control rods control the rate of fission ? (b) how is heat removed from the reactor core, and what use is made of this heat ?
Answer» In the nuclear reactor of a power plant : (a) how do control rods control the rate of fission ? (b) how is heat removed from the reactor core, and what use is made of this heat ?

Discussion

45.	Why is it difficult to walk on Sand ? (a) Because Sand is soft and does not oppose motion (b) Because Sand is soft and opposes motion (c) Because Sand does not yield high Reaction forces required for Walking (d) Because Sand yields Reaction forces required for Walking.
Answer» Why is it difficult to walk on Sand ? (a) Because Sand is soft and does not oppose motion (b) Because Sand is soft and opposes motion (c) Because Sand does not yield high Reaction forces required for Walking (d) Because Sand yields Reaction forces required for Walking.

Discussion

46.	A large coal fired power station produces 2000MW of electrical energy.A wind turbine with 33 m blades can produce 300kW. i)How many turbines would be needed to replace the power station ii)Why,in actual practice this number of turbines coupd nit replace coal powered power station
Answer» A large coal fired power station produces 2000MW of electrical energy.A wind turbine with 33 m blades can produce 300kW. i)How many turbines would be needed to replace the power station ii)Why,in actual practice this number of turbines coupd nit replace coal powered power station

Discussion

47.	Electric field intensity in terms of lembda
Answer» Electric field intensity in terms of lembda

Discussion

48.	Distinct [1]He is distinct about what is right and what is wrong. [2]Mars became distinct on the horizon in the month of August. [3]The distinct strains of Ravi's violin could be heard above the general din. [4]Ghoshbabu's is a distinct case of water rising above its own level.
Answer» Distinct $\begin{matrix} [1] & He is distinct about what is right and what is wrong. [2] & Mars became distinct on the horizon in the month of August. [3] & The distinct strains of Ravi's violin could be heard above the general din. [4] & Ghoshbabu's is a distinct case of water rising above its own level. \end{matrix}$

Discussion

49.	Absolute refractive index of glass is 1.5 and refractive index of glass with respect to water is 1.125. The absolute refractive index of water is ______
Answer» Absolute refractive index of glass is $1.5$ and refractive index of glass with respect to water is $1.125$ . The absolute refractive index of water is ______

Discussion

50.	explain the kinetic energy vs intensity graph.
Answer» explain the kinetic energy vs intensity graph.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

How to make home made rechargable battery?

A convex lens is a ________ and a concave lens is a _________.

Question 10How many 176Ω resistors (in parallel) are required to carry 5 A on a 220 V line?

Whitaker evolved from a Naturalist to Conservationist because he realized that(a) Naturalists get obsessed with animals(b) It was the requirement of Rolex award(c) Conservationist has more importance than naturalist(d) Animals cannot be saved without saving their habitat

ntHYDRAZENE can be used in fuel cell N2H4(aq) + O2(aq)=N2(g)+2H2O(liq).If delta G for this reaction is -600KJ,What will be the E for the cell?n

Two masses of 0.25 kg moving towards each other with speed 3 and 1 m/s collide and stick together Find the final velocity

(a) Describe briefly one way of producing an induced e.m.f. (b) State one factor that determines the magnitude of induced e.m.f. in part (a) above. (c) What factor determines the direction of induced e.m.f. in part (a) above?

Calculate the approximate temperature of 27∘C in Kelvin.

Find the angle between the emergent ray and incident ray when the light goes from air to glass slab. Given μglass ​= 1.5

5."A source of unknown frequency gives 4 beats/Sec when sounded with a source of unknown frequency gives 5 beats/sec when sounded with a source of frequency 513 HZ.the unknown frequency is a)240 b)246

Light from a denser medium 1 passes to a rarer medium 2. When the angle of incidence is θ, the partially reflected and refracted rays are mutually perpendicular. The critical angle will be

An electric motor is a device which transforms : (a) mechanical energy to electrical energy (b) heat energy to electrical energy (c) electrical energy to heat energy only (d) electrical energy to mechanical energy

The eye can control the amount of light falling on the retina. Which part of the eye is responsible for this?

The length of a Galilean telescope is 33 cm when focused to form an image at infinity. If the objective lens has a focal length of 35 cm, what is the focal length of the eyepiece?

With the help of suitable diagram, explain the phenomenon of early sunrise and delayed sunset.

If the work done to transfer 10 C of charge between two bodies A and B is 10 joules then find the potential difference between them.

What is the meaning of positron (antielectron)

In ..................... combination of resistors, the total resistance is more than the highest resistance. __

Why don’t two magnetic lines of force intersect each other?

If a bar magnet is given a shape like V on one pole and another pole remain as it is then how will north and south pole will exist.

A solid metallic sphere is placed in a uniform electric field. Which of the following curves shown represent the lines of force correctly?

Describe in brief how would you determine the approximate focal length of a convex lens.

A bar magnet falls with its North Pole pointing down through the axis of a copper ring. When viewed from above, the current in the ring will be

An electric refrigerator rated 500W operates 24 hours/day. What is the cost of the energy to operate it for 20 days at rupees 2.00 per kWh.

For a normal eye,the cornea of eye provides a converging power of 40 D and the least converging power of the eye lens behind the cornea is 20D . using this information ,the distance between the retina and the cornea-eye lens can be estimated

A FM radio station broadcast at a frequency of 103.1 MHz. What is the wavelength of these radio waves?

standing waves are produced on a string. If the wave velocity is 50m/s and minimum time interval bw two instants when the string is flat is 0.1s, distance bw 2 consecutive nodes is?

A block of mass 5 kg is pushed up 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

In the figure shown below, find the minimum value of i for which total internal reflection never takes place at P.[Medium surrounding the slab has refractive index μ2]

A solenoid of length 0.4 m and diameter 0.6 m consists of a single layer of 1000 turns of fine wire carrying a current of 5.0 mA. Find the magnetic field on the axis at the ends of the solenoid.[Take, μ0=4π×10−7 Tm A−1]

Find the reminder when67 to the power67 is divided by 5

15. which is false about lithium 1)most electronegative among alkali metals 2)forms peroxide but not superoxide

At 27^0C a sample of ammonia gas exerts a pressure of s5.3atm .What is the pressure when the volume of the gas is reduced to one tenth of the original value at the same temperature

Two planets move around the sun. The time periods and the mean radii of the orbits are T1,T2 and r1,r2 respectively. The ratio T1T2 is equal to

In the electroplating process, the object to be electroplated is used as___

A ray of light falls on the plane surface of a half cylinder at an angle 45∘ in the plane perpendicular to the axis (see figure). Refractive index of glass is √2 and radius of cylinder is √3 m. The value of OP in critical case is

The reason why the earth wire is used is:

One face of a rectangular glass plate 6 cm thick is silvered. An object held 8 cm in front of the first face, forms an image 12 cm behind the silvered face. The refractive index of the glass is :

An empty vessel is partially filled with water, then the frequency of vibration of air column in the vessel

Nowadays we are using alternate or non-conventional sources of energy more. Why?

In the nuclear reactor of a power plant : (a) how do control rods control the rate of fission ? (b) how is heat removed from the reactor core, and what use is made of this heat ?

Why is it difficult to walk on Sand ? (a) Because Sand is soft and does not oppose motion (b) Because Sand is soft and opposes motion (c) Because Sand does not yield high Reaction forces required for Walking (d) Because Sand yields Reaction forces required for Walking.

A large coal fired power station produces 2000MW of electrical energy.A wind turbine with 33 m blades can produce 300kW. i)How many turbines would be needed to replace the power station ii)Why,in actual practice this number of turbines coupd nit replace coal powered power station

Electric field intensity in terms of lembda

Distinct [1]He is distinct about what is right and what is wrong. [2]Mars became distinct on the horizon in the month of August. [3]The distinct strains of Ravi's violin could be heard above the general din. [4]Ghoshbabu's is a distinct case of water rising above its own level.

Absolute refractive index of glass is 1.5 and refractive index of glass with respect to water is 1.125. The absolute refractive index of water is ______

explain the kinetic energy vs intensity graph.

A convex lens is a and a concave lens is a _.

Find the angle between the emergent ray and incident ray when the light goes from air to glass slab. Given μglass = 1.5