16569 + Interview Questions in Physics Page 5 InterviewSolution

201.	A metallic block carrying current I is subjected to a uniform magnetic field →B as shown in the figure. The moving charges experience a force →F given by ........... which results in the lowering of the potential of the face ........ Assume the speed of the carriers to be v
Answer» A metallic block carrying current I is subjected to a uniform magnetic field $\to B$ as shown in the figure. The moving charges experience a force $\to F$ given by ........... which results in the lowering of the potential of the face ........ Assume the speed of the carriers to be v

Discussion

202.	Which of the following is not caused by the atmospheric refraction of light ? (a) twinkling of stars at night (b) sun appearing higher in the sky than it actually is (c) sun becoming visible two minutes before actual sunrise (d) sun appearing red at sunset
Answer» Which of the following is not caused by the atmospheric refraction of light ? (a) twinkling of stars at night (b) sun appearing higher in the sky than it actually is (c) sun becoming visible two minutes before actual sunrise (d) sun appearing red at sunset

Discussion

203.	A ray of light is incident at 60∘, on glass-air interface. Then the light ray will- Use: [μw=√2,μa = 1]
Answer» A ray of light is incident at $60^{\circ}$ , on glass-air interface. Then the light ray will- Use: $[μ_{w} = \sqrt{2}, μ_{a} = 1]$

203.

A ray of light is incident at 60∘, on glass-air interface. Then the light ray will- Use: [μw=√2,μa = 1]

Answer»

A ray of light is incident at $60^{\circ}$ , on glass-air interface. Then the light ray will-

Use: $[μ_{w} = \sqrt{2}, μ_{a} = 1]$

Discussion

204.	A cell supplies a current of 0.6 A through a 2Ω coil and a current of 0.3 A through and 8Ω coil. Calculate the EMF and the internal resistance of the cell. [4 MARKS]
Answer» A cell supplies a current of 0.6 A through a $2 Ω$ coil and a current of 0.3 A through and $8 Ω$ coil. Calculate the EMF and the internal resistance of the cell. [4 MARKS]

Discussion

205.	Why does light bend during refraction?
Answer» Why does light bend during refraction?

Discussion

206.	Which fuel is used in rocket propulsion?
Answer» Which fuel is used in rocket propulsion?

Discussion

207.	The major cause of enviornmental pollution is the use of : (a) hydrogen as fuel (b) biomass energy (c) ocean energy (d) fossil fuels
Answer» The major cause of enviornmental pollution is the use of : (a) hydrogen as fuel (b) biomass energy (c) ocean energy (d) fossil fuels

Discussion

208.	The variation in an alternating emf with time is shown below. Calculate the mean value per cycle of the given emf.
Answer» The variation in an alternating emf with time is shown below. Calculate the mean value per cycle of the given emf.

Discussion

209.	Given R1 = 5.0+0.20 and R2=10.0+0.10. What is the total resistance in parallel with possible % error?
Answer» Given R1 = 5.0+0.20 and R2=10.0+0.10. What is the total resistance in parallel with possible % error?

Discussion

210.	What r next nearest neighbor .in fcc and bcc how many next nearest neighbor r present
Answer» What r next nearest neighbor .in fcc and bcc how many next nearest neighbor r present

Discussion

211.	The potential difference applied across a given resistor is altered so that the heat produced per second increase by a factor of 9. By what factor does the potential difference changes.
Answer» The potential difference applied across a given resistor is altered so that the heat produced per second increase by a factor of 9. By what factor does the potential difference changes.

Discussion

212.	If the angle of deviation produced by a thin prism of referactive index μ=1.6 is 3∘. Then the angle of the thin prism is :
Answer» If the angle of deviation produced by a thin prism of referactive index $μ = 1.6$ is $3^{\circ}$ . Then the angle of the thin prism is :

Discussion

213.	percentage decrease in the value of acceleration due to gravity on moving 32 km above the earth surface wrt earth's surface is (take radius of earth 6400) 1. 0.5% 2. 1% 3.1.5% 4.2
Answer» percentage decrease in the value of acceleration due to gravity on moving 32 km above the earth surface wrt earth's surface is (take radius of earth 6400) 1. 0.5% 2. 1% 3.1.5% 4.2

Discussion

214.	_______ is the released during fusion or fission reaction.
Answer» _______ is the released during fusion or fission reaction.

Discussion

215.	A Resis†an ce R is connected in parallel with a variable resis†an ce r . Then they are connected in series with resis†an ce R . They are joined to a battery of V voltage . Resis†an ce r is variable resis†an ce . If for r = fR , the heat generation in r is maximum , then the value of f is (1) 1/2 (2) 1 (3) 1/4 (4) 3/4
Answer» A Resis†an ce R is connected in parallel with a variable resis†an ce r . Then they are connected in series with resis†an ce R . They are joined to a battery of V voltage . Resis†an ce r is variable resis†an ce . If for r = fR , the heat generation in r is maximum , then the value of f is (1) 1/2 (2) 1 (3) 1/4 (4) 3/4

Discussion

216.	For students P, Q, R and S traced the path of a ray of light passing through a glass slab for an angle of incidence 40∘ and measured the angle of refraction. The values as measured them were 18∘;22∘;25∘ and 30∘ respectively. The student who has performed the experiment methodically is
Answer» For students P, Q, R and S traced the path of a ray of light passing through a glass slab for an angle of incidence $40^{\circ}$ and measured the angle of refraction. The values as measured them were $18^{\circ}; 22^{\circ}; 25^{\circ}$ and $30^{\circ}$ respectively. The student who has performed the experiment methodically is

Discussion

217.	14.Why potential difference is different in series combination and same in parallel combination?
Answer» 14.Why potential difference is different in series combination and same in parallel combination?

Discussion

218.	28. In lenses the image and object distance is always negative?
Answer» 28. In lenses the image and object distance is always negative?

Discussion

219.	Working of safety fuse
Answer» Working of safety fuse

Discussion

220.	A gas occupies 300 cm3 at 273 K and 700 mm pressure. Calculate the volume of the gas at STP
Answer» A gas occupies 300 $c m^{3}$ at 273 K and 700 mm pressure. Calculate the volume of the gas at STP

Discussion

221.	A piece of copper wire is cut into ten equal parts. Theseparts are connected in parallel. The joint resistanceparallel combination will be equal to the original resistaof uncut wire, multiplied by a factor of:(1) 0.01 (2) 0.1 (3) 100 (4) 1
Answer» A piece of copper wire is cut into ten equal parts. Theseparts are connected in parallel. The joint resistanceparallel combination will be equal to the original resistaof uncut wire, multiplied by a factor of:(1) 0.01 (2) 0.1 (3) 100 (4) 1

Discussion

222.	How to get tension in a string which is hanged to a wall of block of mass 5kg what is its acceleratio
Answer» How to get tension in a string which is hanged to a wall of block of mass 5kg what is its acceleratio

Discussion

223.	Question 28 (i) B1, B2, and B3 are three identical bulbs connected as shown in Figure. When all the three bulbs glow, a current of 3A is recorded by the ammeter A. (i) What happens to the glow of the other two bulbs when the bulb B1 gets fused?
Answer» Question 28 (i) $B_{1}, B_{2}, a n d B_{3}$ are three identical bulbs connected as shown in Figure. When all the three bulbs glow, a current of 3A is recorded by the ammeter A. (i) What happens to the glow of the other two bulbs when the bulb $B_{1}$ gets fused?

Discussion

224.	Electricity flows through ___ and does not pass through ___ .
Answer» Electricity flows through ___ and does not pass through ___ .

Discussion

225.	the minimum and maximum distances of a satellite from centre of earth are 2r and 4r . where r is radius of earth M is mass of earth . the value of maximum speed of satellite will be
Answer» the minimum and maximum distances of a satellite from centre of earth are 2r and 4r . where r is radius of earth M is mass of earth . the value of maximum speed of satellite will be

Discussion

226.	(a) What are fossil fuels? Give three examples of fossil fuels. (b) Describe how fossil fuels were formed. (c) Explain how, sun is considered to be the ultimate source of fossil fuels. (d) Which fossil fuels were formed by the buried remains of small plants and animals? (e) Which fossil fuel was formed by the buried remains of large land plants?
Answer» (a) What are fossil fuels? Give three examples of fossil fuels. (b) Describe how fossil fuels were formed. (c) Explain how, sun is considered to be the ultimate source of fossil fuels. (d) Which fossil fuels were formed by the buried remains of small plants and animals? (e) Which fossil fuel was formed by the buried remains of large land plants?

Discussion

227.	Question 18 (c)A person needs a lens of power –4.5 D for correction of her vision.What is the nature of the corrective lens?
Answer» Question 18 (c) A person needs a lens of power –4.5 D for correction of her vision. What is the nature of the corrective lens?

Discussion

228.	Fig. 4.62 shows a point source P inside a water container. Three rays A, B and C starting from the source P are shown up to the water surface. (a) Show in the diagram the path of these rays after striking the water surface. The critical angle for water-air surface is 48∘. (b) Name the phenomenon which the rays A, B and C exhibit.
Answer» Fig. 4.62 shows a point source P inside a water container. Three rays A, B and C starting from the source P are shown up to the water surface. (a) Show in the diagram the path of these rays after striking the water surface. The critical angle for water-air surface is $48^{\circ}$ . (b) Name the phenomenon which the rays A, B and C exhibit.

228.

Fig. 4.62 shows a point source P inside a water container. Three rays A, B and C starting from the source P are shown up to the water surface. (a) Show in the diagram the path of these rays after striking the water surface. The critical angle for water-air surface is 48∘. (b) Name the phenomenon which the rays A, B and C exhibit.

Answer»

Fig. 4.62 shows a point source P inside a water container. Three rays A, B and C starting from the source P are shown up to the water surface.
(a) Show in the diagram the path of these rays after striking the water surface. The critical angle for water-air surface is $48^{\circ}$ .
(b) Name the phenomenon which the rays A, B and C exhibit.

Discussion

229.	Write a note on propulsion system of rocket
Answer» Write a note on propulsion system of rocket

Discussion

230.	Why are the stringed instruments like guitar provided with a hollow sound box ?
Answer» Why are the stringed instruments like guitar provided with a hollow sound box ?

Discussion

231.	what is end correction and radar frequency?
Answer» what is end correction and radar frequency?

Discussion

232.	A simply supported rectangular beam of span 18 m is subjected to a UDL. The minimum effective depth required to check deflection of this beam, when modification factor for tension and compression are 0.85 and 1.2 respectively, will be________m.1.59
Answer» A simply supported rectangular beam of span 18 m is subjected to a UDL. The minimum effective depth required to check deflection of this beam, when modification factor for tension and compression are 0.85 and 1.2 respectively, will be________m. 1.59

Discussion

233.	The net magnitude of magnetic field at point O is
Answer» The net magnitude of magnetic field at point O is

Discussion

234.	Resistance of a metal wire of length 5m is 20Ω at 20⁰. If the diameter of thewire is 0.4mm, what will be the resistivity of the metal at that temperature?
Answer» Resistance of a metal wire of length 5m is 20Ω at 20⁰. If the diameter of the wire is 0.4mm, what will be the resistivity of the metal at that temperature?

Discussion

235.	If the critical Angle for total internal reflection from a medium 2 vacuum is 30 degree the velocity of light in the medium is?
Answer» If the critical Angle for total internal reflection from a medium 2 vacuum is 30 degree the velocity of light in the medium is?

Discussion

236.	Saturn and Jupiter take 9 hours 56 min and 10 hours 40 min, respectively for one spin on their axes. Find the ratio of the time taken by Saturn and Jupiter in lowest form.
Answer» Saturn and Jupiter take 9 hours 56 min and 10 hours 40 min, respectively for one spin on their axes. Find the ratio of the time taken by Saturn and Jupiter in lowest form.

Discussion

237.	The resistance a solution A is 50 ohm and that of solution B is 100 ohm, both solutions are taken in the same conductivity cell. If equal volumes of solution A and B are mixed, what is the resistance of the mixture using the same cell? (Assume there is no change or increase in the α of A and B on mixing)
Answer» The resistance a solution A is 50 ohm and that of solution B is 100 ohm, both solutions are taken in the same conductivity cell. If equal volumes of solution A and B are mixed, what is the resistance of the mixture using the same cell? (Assume there is no change or increase in the α of A and B on mixing)

Discussion

238.	Write a short note on Flight adaptation in bats.
Answer» Write a short note on Flight adaptation in bats.

Discussion

239.	A power system shown below has following specifications of components:G1: 22 kV, 20 MVA, X = 5%G2: 22 kV, 20 MVA, X= 5%T1: 22 kV/100 kV, 18 MVA, X = 10%T2= 100 kV/22kV, 18 MVA, X = 10%Tx−line:= 110 kV, X = 90 ΩIf the base voltage of 22 kV of G1 as is taken as base voltage and 40 MVA as base MVA, the corresponding impedance diagram will be(in pu).
Answer» A power system shown below has following specifications of components: $G_{1} :$ 22 kV, 20 MVA, X = 5% $G_{2} :$ 22 kV, 20 MVA, X= 5% $T_{1} :$ 22 kV/100 kV, 18 MVA, X = 10% $T_{2} =$ 100 kV/22kV, 18 MVA, X = 10% $T_{x - l i n e} :=$ 110 kV, X = 90 $Ω$ If the base voltage of 22 kV of $G_{1}$ as is taken as base voltage and 40 MVA as base MVA, the corresponding impedance diagram will be(in pu).

Discussion

240.	The Heat Capacity Of Material Depends Upon______
Answer» The Heat Capacity Of Material Depends Upon______

Discussion

241.	What is difference between ultrasonic and supersonic
Answer» What is difference between ultrasonic and supersonic

Discussion

242.	You are provided with a mixture containing sand, Iron filings, ammonium chloride, and sodium chloride. Describe the procedure you would use to separate these constituents from the mixture.
Answer» You are provided with a mixture containing sand, Iron filings, ammonium chloride, and sodium chloride. Describe the procedure you would use to separate these constituents from the mixture.

Discussion

243.	Suppose that intensity of a laser is (315π) W/m2. The rms electric field, in units of V/m associated with this source is close to the nearest integer is (∈0=8.86×10−12 C2Nm−2;c=3×108 ms−1)
Answer» Suppose that intensity of a laser is $(\frac{315}{π}) {W/m}^{2}$ . The rms electric field, in units of $V/m$ associated with this source is close to the nearest integer is $(\in_{0} = 8.86 \times 10^{- 12} C^{2} {Nm}^{- 2}; c = 3 \times 10^{8} {ms}^{- 1})$

Discussion

244.	12. Exerimental value of magnetic moment of Mn2+ complex is 5.96BM.This indicates a)axial and orbital motion of electron in same direction b)axial and orbital motion of electron in opposite direction c)electron does not exhibit orbital motion,it only exhibit axial motion d)electron doesnot exhibit axial motion ,it only exhibits orbital motion
Answer» 12. Exerimental value of magnetic moment of Mn2+ complex is 5.96BM.This indicates a)axial and orbital motion of electron in same direction b)axial and orbital motion of electron in opposite direction c)electron does not exhibit orbital motion,it only exhibit axial motion d)electron doesnot exhibit axial motion ,it only exhibits orbital motion

Discussion

245.	Point out difference between a convex lens and a concave lens.
Answer» Point out difference between a convex lens and a concave lens.

Discussion

246.	Temperature coefficient of resistance is 0.029 /^° C. If resis†an ce at T^° C is 20 ohm.Find the resistance of temp. is increased by 1^° C
Answer» Temperature coefficient of resistance is 0.029 /^° C. If resis†an ce at T^° C is 20 ohm.Find the resistance of temp. is increased by 1^° C

Discussion

247.	The angle of incidence at which reflected light is completely plane polarized during reflection from air to glass (refractive index μ) is,
Answer» The angle of incidence at which reflected light is completely plane polarized during reflection from air to glass (refractive index $μ$ ) is,

Discussion

248.	A virtual image of half the size of the object is formed by a convex mirror at a distance of 30cm from the object. What is the radius of curvature of the mirror?
Answer» A virtual image of half the size of the object is formed by a convex mirror at a distance of 30cm from the object. What is the radius of curvature of the mirror?

Discussion

249.	We saw in this chapter that there are four main stakeholders when it comes to forests and wildlife. Which among these should have the authority to decide the management of forest produce? Why do you think so?
Answer» We saw in this chapter that there are four main stakeholders when it comes to forests and wildlife. Which among these should have the authority to decide the management of forest produce? Why do you think so?

Discussion

250.	explain terminal potential difference and its significanc
Answer» explain terminal potential difference and its significanc

Discussion

Explore topic-wise InterviewSolutions in .

A metallic block carrying current I is subjected to a uniform magnetic field →B as shown in the figure. The moving charges experience a force →F given by ........... which results in the lowering of the potential of the face ........ Assume the speed of the carriers to be v

Which of the following is not caused by the atmospheric refraction of light ? (a) twinkling of stars at night (b) sun appearing higher in the sky than it actually is (c) sun becoming visible two minutes before actual sunrise (d) sun appearing red at sunset

A ray of light is incident at 60∘, on glass-air interface. Then the light ray will- Use: [μw=√2,μa = 1]

A cell supplies a current of 0.6 A through a 2Ω coil and a current of 0.3 A through and 8Ω coil. Calculate the EMF and the internal resistance of the cell. [4 MARKS]

Why does light bend during refraction?

Which fuel is used in rocket propulsion?

The major cause of enviornmental pollution is the use of : (a) hydrogen as fuel (b) biomass energy (c) ocean energy (d) fossil fuels

The variation in an alternating emf with time is shown below. Calculate the mean value per cycle of the given emf.

Given R1 = 5.0+0.20 and R2=10.0+0.10. What is the total resistance in parallel with possible % error?

What r next nearest neighbor .in fcc and bcc how many next nearest neighbor r present

The potential difference applied across a given resistor is altered so that the heat produced per second increase by a factor of 9. By what factor does the potential difference changes.

If the angle of deviation produced by a thin prism of referactive index μ=1.6 is 3∘. Then the angle of the thin prism is :

percentage decrease in the value of acceleration due to gravity on moving 32 km above the earth surface wrt earth's surface is (take radius of earth 6400) 1. 0.5% 2. 1% 3.1.5% 4.2

_______ is the released during fusion or fission reaction.

For students P, Q, R and S traced the path of a ray of light passing through a glass slab for an angle of incidence 40∘ and measured the angle of refraction. The values as measured them were 18∘;22∘;25∘ and 30∘ respectively. The student who has performed the experiment methodically is

14.Why potential difference is different in series combination and same in parallel combination?

28. In lenses the image and object distance is always negative?

Working of safety fuse

A gas occupies 300 cm3 at 273 K and 700 mm pressure. Calculate the volume of the gas at STP

A piece of copper wire is cut into ten equal parts. Theseparts are connected in parallel. The joint resistanceparallel combination will be equal to the original resistaof uncut wire, multiplied by a factor of:(1) 0.01 (2) 0.1 (3) 100 (4) 1

How to get tension in a string which is hanged to a wall of block of mass 5kg what is its acceleratio

Question 28 (i) B1, B2, and B3 are three identical bulbs connected as shown in Figure. When all the three bulbs glow, a current of 3A is recorded by the ammeter A. (i) What happens to the glow of the other two bulbs when the bulb B1 gets fused?

Electricity flows through ___ and does not pass through ___ .

the minimum and maximum distances of a satellite from centre of earth are 2r and 4r . where r is radius of earth M is mass of earth . the value of maximum speed of satellite will be

Question 18 (c)A person needs a lens of power –4.5 D for correction of her vision.What is the nature of the corrective lens?

Write a note on propulsion system of rocket

Why are the stringed instruments like guitar provided with a hollow sound box ?

what is end correction and radar frequency?

A simply supported rectangular beam of span 18 m is subjected to a UDL. The minimum effective depth required to check deflection of this beam, when modification factor for tension and compression are 0.85 and 1.2 respectively, will be________m.1.59

The net magnitude of magnetic field at point O is

Resistance of a metal wire of length 5m is 20Ω at 20⁰. If the diameter of thewire is 0.4mm, what will be the resistivity of the metal at that temperature?

If the critical Angle for total internal reflection from a medium 2 vacuum is 30 degree the velocity of light in the medium is?

Saturn and Jupiter take 9 hours 56 min and 10 hours 40 min, respectively for one spin on their axes. Find the ratio of the time taken by Saturn and Jupiter in lowest form.

Write a short note on Flight adaptation in bats.

The Heat Capacity Of Material Depends Upon______

What is difference between ultrasonic and supersonic

You are provided with a mixture containing sand, Iron filings, ammonium chloride, and sodium chloride. Describe the procedure you would use to separate these constituents from the mixture.

Suppose that intensity of a laser is (315π) W/m2. The rms electric field, in units of V/m associated with this source is close to the nearest integer is (∈0=8.86×10−12 C2Nm−2;c=3×108 ms−1)

Point out difference between a convex lens and a concave lens.

Temperature coefficient of resistance is 0.029 /^° C. If resis†an ce at T^° C is 20 ohm.Find the resistance of temp. is increased by 1^° C

The angle of incidence at which reflected light is completely plane polarized during reflection from air to glass (refractive index μ) is,

A virtual image of half the size of the object is formed by a convex mirror at a distance of 30cm from the object. What is the radius of curvature of the mirror?

We saw in this chapter that there are four main stakeholders when it comes to forests and wildlife. Which among these should have the authority to decide the management of forest produce? Why do you think so?

explain terminal potential difference and its significanc

Electricity flows through _ and does not pass through _ .