16569 + Interview Questions in Physics Page 16 InterviewSolution

751.	A piece of ice is heated at a constant rate. The variation of temperature with heat input is shown in the graph: AB and CD represent:
Answer» A piece of ice is heated at a constant rate. The variation of temperature with heat input is shown in the graph: AB and CD represent:

751.

A piece of ice is heated at a constant rate. The variation of temperature with heat input is shown in the graph: AB and CD represent:

Answer»

A piece of ice is heated at a constant rate. The variation of temperature with heat input is shown in the graph:

AB and CD represent:

752.	Question 6On converting 25∘C, 38∘C and 66∘C to kelvin scale, the correct sequence of temperature will be(a) 298 K, 311 K and 339 K(b) 298 K, 300 K and 338 K(c) 273 K, 278 K and 543 K(d) 298 K, 310 K and 338 K
Answer» Question 6 On converting 25 $^{\circ}$ C, 38 $^{\circ}$ C and 66 $^{\circ}$ C to kelvin scale, the correct sequence of temperature will be (a) 298 K, 311 K and 339 K (b) 298 K, 300 K and 338 K (c) 273 K, 278 K and 543 K (d) 298 K, 310 K and 338 K

Discussion

753.	Can displacement current be produced in vaccum?
Answer» Can displacement current be produced in vaccum?

Discussion

754.	An orthogonal cutting operation is being carried out in which uncut thickness is 0.010 mm, cutting speed is 130m/min, rake angle is 15° and width of cut is 6 mm. It is observed that the chip thickness is 0.015 mm, the cutting force is 60 N and the thrust force is 25 N. The ratio of friction energy to total energy is (correct to two decimal places)
Answer» An orthogonal cutting operation is being carried out in which uncut thickness is 0.010 mm, cutting speed is 130m/min, rake angle is 15° and width of cut is 6 mm. It is observed that the chip thickness is 0.015 mm, the cutting force is 60 N and the thrust force is 25 N. The ratio of friction energy to total energy is (correct to two decimal places)

Discussion

755.	dimensional formula of avogadro numbe
Answer» dimensional formula of avogadro numbe

Discussion

756.	A mark at the bottom of a liquid container appears to rise by 0.1 m when viewed from above. The depth of the liquid is 1 m. Then, the refractive index of the liquid is :
Answer» A mark at the bottom of a liquid container appears to rise by $0.1 m$ when viewed from above. The depth of the liquid is $1 m$ . Then, the refractive index of the liquid is :

Discussion

757.	The ratio of the speed of e in the ground state of H atom o the speed of light in vaccum
Answer» The ratio of the speed of e in the ground state of H atom o the speed of light in vaccum

Discussion

758.	A power transmission line feeds input power at 2300 V to a step-down transformer with its primary windings having 4000 turns. The output power is delivered at 230 V by the transformer. If the current in the primary coil of the transformer is 5 A and its efficiency is 90%, the output current (in A) would be (Integer only)
Answer» A power transmission line feeds input power at $2300 V$ to a step-down transformer with its primary windings having $4000$ turns. The output power is delivered at $230 V$ by the transformer. If the current in the primary coil of the transformer is $5 A$ and its efficiency is $90 %,$ the output current $(in A)$ would be (Integer only)

Discussion

759.	Question 125 Planet A is at a distance of 9.35×106km from Earth and Planet B is 6.27×107 km from Earth. Which planet is nearer to Earth?
Answer» Question 125 Planet A is at a distance of $9.35 \times 10^{6} k m$ from Earth and Planet B is $6.27 \times 10^{7}$ km from Earth. Which planet is nearer to Earth?

759.

Question 125 Planet A is at a distance of 9.35×106km from Earth and Planet B is 6.27×107 km from Earth. Which planet is nearer to Earth?

Answer»

Question 125

Planet A is at a distance of $9.35 \times 10^{6} k m$ from Earth and Planet B is $6.27 \times 10^{7}$ km from Earth. Which planet is nearer to Earth?

Discussion

760.	Explanation of magnetic Induction in simple words.
Answer» Explanation of magnetic Induction in simple words.

Discussion

761.	The work done by electric field in carrying a point charge 5 μC from a point A to point B is 10 mJ. The potential difference VB−VA is:
Answer» The work done by electric field in carrying a point charge $5 μ C$ from a point $A$ to point $B$ is $10 mJ$ . The potential difference $V_{B} - V_{A}$ is:

Discussion

762.	Focal length of objective eyepiece and inverting lens of terrestrial telescope for 20 CM 10 cm and 5 cm respectively. Length of tube containing these lenses at normal adjustment is (1)30cm (2)35cm (3)50cm (4)40cm
Answer» Focal length of objective eyepiece and inverting lens of terrestrial telescope for 20 CM 10 cm and 5 cm respectively. Length of tube containing these lenses at normal adjustment is (1)30cm (2)35cm (3)50cm (4)40cm

Discussion

763.	Calculate the amount of heat released when 5.0 g of water at 20 °C is changed into ice at 0 °C. Specific heat capacity of water = 4.2J g-1 °C-1, Specific latent heat of fusion of ice = 336 J g-1.
Answer» Calculate the amount of heat released when 5.0 g of water at 20 °C is changed into ice at 0 °C. Specific heat capacity of water = 4.2J g^-1 °C^-1, Specific latent heat of fusion of ice = 336 J g^-1.

763.

Calculate the amount of heat released when 5.0 g of water at 20 °C is changed into ice at 0 °C. Specific heat capacity of water = 4.2J g-1 °C-1, Specific latent heat of fusion of ice = 336 J g-1.

Answer»

Calculate the amount of heat released when 5.0 g of water at 20 °C is changed into ice at 0 °C.

Specific heat capacity of water = 4.2J g^-1 °C^-1, Specific latent heat of fusion of ice = 336 J g^-1.

Discussion

764.	A current is flowing through a cylindrical conductor of radius capital are such that the current density at any cross section is given by 6 is equal to change not smallest even at that because their the smaller is the radial distance from the axis of the cylinder tractor at the total current through the cross section area
Answer» A current is flowing through a cylindrical conductor of radius capital are such that the current density at any cross section is given by 6 is equal to change not smallest even at that because their the smaller is the radial distance from the axis of the cylinder tractor at the total current through the cross section area

Discussion

765.	Statement I : Nuclear fission is a spontaneous process i.e. there is no need of external energy supply for this to happen.Statement II : In a nuclear fission reaction the rest mass energy of the parent nucleus is more than the combined rest mass energy of two daughter fragments and neutrons.
Answer» Statement I : Nuclear fission is a spontaneous process i.e. there is no need of external energy supply for this to happen. Statement II : In a nuclear fission reaction the rest mass energy of the parent nucleus is more than the combined rest mass energy of two daughter fragments and neutrons.

Discussion

766.	Water in a pond appears to be only three-quarter of its actual depth. (a) What property of light is responsible for this observation? Illustrate your answer with the help of a ray diagram. (b) How the refractive index of water calculated from its real and apparent depths?
Answer» Water in a pond appears to be only three-quarter of its actual depth. (a) What property of light is responsible for this observation? Illustrate your answer with the help of a ray diagram. (b) How the refractive index of water calculated from its real and apparent depths?

Discussion

767.	51. Water is flowing through a horizontal pipe with speed 2m/s and power applied is 20W . If speed becomes double then power applied will be
Answer» 51. Water is flowing through a horizontal pipe with speed 2m/s and power applied is 20W . If speed becomes double then power applied will be

Discussion

768.	When a voltage V = V0cosωt is applied across a resistor of resistance R, the average power dissipated per cycle in the resistor is given by?
Answer» When a voltage V = V0cosωt is applied across a resistor of resistance R, the average power dissipated per cycle in the resistor is given by?

Discussion

769.	Question 5The refractive index of diamond is 2.42. What is the meaning of this statement?
Answer» Question 5 The refractive index of diamond is 2.42. What is the meaning of this statement?

Discussion

770.	Two samples, each containing 400 g of water, are mixed. The temperature of sample A before mixing was 65∘C and that of sample B was 20∘C. What will be the final temperature of the mixture? (Specific heat of water = 4186 J/(kg.K)
Answer» Two samples, each containing $400 g$ of water, are mixed. The temperature of sample A before mixing was $65^{\circ} C$ and that of sample B was $20^{\circ} C$ . What will be the final temperature of the mixture? (Specific heat of water = 4186 J/(kg.K)

Discussion

771.	In the given figure, where do the diverging rays seem to meet?(F1 ,F2 are the primary focus of the lens)
Answer» In the given figure, where do the diverging rays seem to meet? ( $F_{1}$ , $F_{2}$ are the primary focus of the lens)

Discussion

772.	A certain quantity of gas occupied 100 mL whencollected over water at 15^° C and 750 mm pressure.It occupies 91.9 mL in dry state at NTP. Find thevapour pressure of water at 15^° C
Answer» A certain quantity of gas occupied 100 mL whencollected over water at 15^° C and 750 mm pressure.It occupies 91.9 mL in dry state at NTP. Find thevapour pressure of water at 15^° C

Discussion

773.	The divergence of the vector field (x−y)^i+(y−x)^j+(x+y+z)^k is
Answer» The divergence of the vector field $(x - y)^i + (y - x)^j + (x + y + z)^k$ is

Discussion

774.	10. The amount of ice that must be melt to decreasethe volume of an ice water mixture by 1 cm3, is\lbrack Density of ice = 0.9 g/cm3\rbrack m
Answer» 10. The amount of ice that must be melt to decreasethe volume of an ice water mixture by 1 cm3, is\lbrack Density of ice = 0.9 g/cm3\rbrack m

Discussion

775.	The focal length of a plano - convex lens is equal to its radius of curvature of convex side. The value of the refractive index of its material is
Answer» The focal length of a plano - convex lens is equal to its radius of curvature of convex side. The value of the refractive index of its material is

Discussion

776.	1. Does light travel in vacume? 2. Why do we need tubelight and bulbs to see other objects? 3. Why can't we see in dark?
Answer» 1. Does light travel in vacume? 2. Why do we need tubelight and bulbs to see other objects? 3. Why can't we see in dark?

Discussion

777.	An electric heater is rated 200 Volt and 10 Amp. Calculate the resistance offered by the heater.
Answer» An electric heater is rated 200 Volt and 10 Amp. Calculate the resistance offered by the heater.

Discussion

778.	There is a rod of length I. The velocities of its twoends are V1 and v2 n opposite directions normal to rod. The angular velocity of rod is
Answer» There is a rod of length I. The velocities of its twoends are V1 and v2 n opposite directions normal to rod. The angular velocity of rod is

Discussion

779.	Which is deviated more by a glass prism- red light or violet light?
Answer» Which is deviated more by a glass prism- red light or violet light?

Discussion

780.	what is terredtrial and galileo's telescope and fornormal adjustment?
Answer» what is terredtrial and galileo's telescope and fornormal adjustment?

Discussion

781.	40 g of water at 60°C is poured into a vessel containing 50 g of water at 20°C. The final temperature recorded is 30°C. The thermal capacity of the vessel is: [Take specific heat capacity of water as 4.2J g-1 oC-1]
Answer» 40 g of water at 60°C is poured into a vessel containing 50 g of water at 20°C. The final temperature recorded is 30°C. The thermal capacity of the vessel is: [Take specific heat capacity of water as 4.2J g^{-1 o}C^-1]

Discussion

782.	34.At 0 degree Celsius the resistance of two wires are R1 and R2. The coefficient of Resistance are alpha1 and alpha2 .If the resistance are connected in series then equivalent resistance is how many times the coefficient of Resistance ?
Answer» 34.At 0 degree Celsius the resistance of two wires are R1 and R2. The coefficient of Resistance are alpha1 and alpha2 .If the resistance are connected in series then equivalent resistance is how many times the coefficient of Resistance ?

Discussion

783.	1 kg piece of copper is drawn into a wire 1 m2 thick, and another 1 kg copper piece into a wire 2 m2 thick. Compare the resistance of these wires.
Answer» 1 kg piece of copper is drawn into a wire 1 m² thick, and another 1 kg copper piece into a wire 2 m² thick. Compare the resistance of these wires.

Discussion

784.	A body cools from 50^°C to 40^°C in10 minutes. How long will it take to cool from 40^°C to 30^°C. Of temperature of surrounding to be 30^°C? 1) 10 minutes 2) 12 minutes 3) 15 minutes 4) infinite time
Answer» A body cools from 50^°C to 40^°C in10 minutes. How long will it take to cool from 40^°C to 30^°C. Of temperature of surrounding to be 30^°C? 1) 10 minutes 2) 12 minutes 3) 15 minutes 4) infinite time

Discussion

785.	A compound contains two elements ′X′ and ′Y′ in the ratio of Mass percentage of 50% each. Atomic mass of ′X′ is 20 and ′Y′ is 40. What can be its simplest formula?
Answer» A compound contains two elements $^{'} X^{'}$ and $^{'} Y^{'}$ in the ratio of Mass percentage of $50 %$ each. Atomic mass of $^{'} X^{'}$ is 20 and $^{'} Y^{'}$ is 40. What can be its simplest formula?

Discussion

786.	A monochromatic beam of light passes from air into a glass block. An expression that relates the wavelength of light, with the speed of light in air and the speed of light in glass is:
Answer» A monochromatic beam of light passes from air into a glass block. An expression that relates the wavelength of light, with the speed of light in air and the speed of light in glass is:

786.

A monochromatic beam of light passes from air into a glass block. An expression that relates the wavelength of light, with the speed of light in air and the speed of light in glass is:

Answer»

A monochromatic beam of light passes from air into a glass block.

An expression that relates the wavelength of light, with the speed of light in air and the speed of light in glass is:

Discussion

787.	(a) Two lenses have power of (i) + 2 D (ii) −4 D. What is the nature and focal length of each lens?(b) An object is kept at a distance of 100 cm from each of the above lenses. Calculate the (i) image distance (ii) magnification in each of the two cases.
Answer» (a) Two lenses have power of (i) + 2 D (ii) −4 D. What is the nature and focal length of each lens? (b) An object is kept at a distance of 100 cm from each of the above lenses. Calculate the (i) image distance (ii) magnification in each of the two cases.

Discussion

788.	explain loudness versus intensity of sound graph in detai
Answer» explain loudness versus intensity of sound graph in detai

Discussion

789.	A capacitor of capacitance C is given a charge Q. At t=0, it is connected to an uncharged capacitor of equal capacitance through a resistor R. The charge on second as a function of time is?
Answer» A capacitor of capacitance C is given a charge Q. At t=0, it is connected to an uncharged capacitor of equal capacitance through a resistor R. The charge on second as a function of time is?

Discussion

790.	Work done in adiabatic process
Answer» Work done in adiabatic process

Discussion

791.	What colours make up white light ?
Answer» What colours make up white light ?

Discussion

792.	Four identical point masses each equal to M are placed at the four corners of a square of side a. Calculate force of attraction on another point mass m1 kept at the centre of the square
Answer» Four identical point masses each equal to M are placed at the four corners of a square of side a. Calculate force of attraction on another point mass m1 kept at the centre of the square

Discussion

793.	(i) A ray of white light breaks up into its components while passing through a glass prism. Draw a ray diagram to show the path of rays. (ii) Mark the least deviated colour in your diagram. (iii) Why do different coloured rays devitate differently in prism ?
Answer» (i) A ray of white light breaks up into its components while passing through a glass prism. Draw a ray diagram to show the path of rays. (ii) Mark the least deviated colour in your diagram. (iii) Why do different coloured rays devitate differently in prism ?

Discussion

794.	A bar magnet of length L and magnetic moment M is bent into the form of a semicircle. Now, its magnetic moment will be -
Answer» A bar magnet of length $L$ and magnetic moment $M$ is bent into the form of a semicircle. Now, its magnetic moment will be -

Discussion

795.	A coil of inductance L=2.0 μH and resistance R=1.0 Ω is connected to a source of constant emf ϵ=3.0 Vresistance R0=2.0 Ω is connected in parallel with the coil.The amount of heat generated in the coil after the switch Sw is disconected (in microjoule) is (The internal resistance of the source is negligible.)
Answer» A coil of inductance $L = 2.0 μ H$ and resistance $R = 1.0 Ω$ is connected to a source of constant emf $ϵ = 3.0 V$ resistance $R_{0} = 2.0 Ω$ is connected in parallel with the coil.The amount of heat generated in the coil after the switch $S_{w}$ is disconected (in microjoule) is (The internal resistance of the source is negligible.)

Discussion

796.	The spacing between the magnetic field lines _____ as we move away from the current carrying conductor.
Answer» The spacing between the magnetic field lines _____ as we move away from the current carrying conductor.

Discussion

797.	An electric bulb (100W) which cosider as a point source whose efficiency is 2.5%. The electric field (peak value) produced by radiation coming from bulb at distance of 3m is?
Answer» An electric bulb (100W) which cosider as a point source whose efficiency is 2.5%. The electric field (peak value) produced by radiation coming from bulb at distance of 3m is?

Discussion

798.	Find the average current for the time interval t=0 to t=5 s if the current is given by, i=(2t+1) A.
Answer» Find the average current for the time interval $t = 0$ to $t = 5 s$ if the current is given by, $i = (2 t + 1) A$ .

Discussion

799.	A block of mass 3 kg lies at rest on an inclined plane of angle of inclination 30^°. The magnitude of the force exerted by the surface on the block is:________(g= 10 ms^{-2})
Answer» A block of mass 3 kg lies at rest on an inclined plane of angle of inclination 30^°. The magnitude of the force exerted by the surface on the block is:________(g= 10 ms^{-2})

Discussion

800.	what is current loop?
Answer» what is current loop?

Discussion

Explore topic-wise InterviewSolutions in .

A piece of ice is heated at a constant rate. The variation of temperature with heat input is shown in the graph: AB and CD represent:

Question 6On converting 25∘C, 38∘C and 66∘C to kelvin scale, the correct sequence of temperature will be(a) 298 K, 311 K and 339 K(b) 298 K, 300 K and 338 K(c) 273 K, 278 K and 543 K(d) 298 K, 310 K and 338 K

Can displacement current be produced in vaccum?

dimensional formula of avogadro numbe

A mark at the bottom of a liquid container appears to rise by 0.1 m when viewed from above. The depth of the liquid is 1 m. Then, the refractive index of the liquid is :

The ratio of the speed of e in the ground state of H atom o the speed of light in vaccum

Question 125 Planet A is at a distance of 9.35×106km from Earth and Planet B is 6.27×107 km from Earth. Which planet is nearer to Earth?

Explanation of magnetic Induction in simple words.

The work done by electric field in carrying a point charge 5 μC from a point A to point B is 10 mJ. The potential difference VB−VA is:

Focal length of objective eyepiece and inverting lens of terrestrial telescope for 20 CM 10 cm and 5 cm respectively. Length of tube containing these lenses at normal adjustment is (1)30cm (2)35cm (3)50cm (4)40cm

Calculate the amount of heat released when 5.0 g of water at 20 °C is changed into ice at 0 °C. Specific heat capacity of water = 4.2J g-1 °C-1, Specific latent heat of fusion of ice = 336 J g-1.

Statement I : Nuclear fission is a spontaneous process i.e. there is no need of external energy supply for this to happen.Statement II : In a nuclear fission reaction the rest mass energy of the parent nucleus is more than the combined rest mass energy of two daughter fragments and neutrons.

Water in a pond appears to be only three-quarter of its actual depth. (a) What property of light is responsible for this observation? Illustrate your answer with the help of a ray diagram. (b) How the refractive index of water calculated from its real and apparent depths?

51. Water is flowing through a horizontal pipe with speed 2m/s and power applied is 20W . If speed becomes double then power applied will be

When a voltage V = V0cosωt is applied across a resistor of resistance R, the average power dissipated per cycle in the resistor is given by?

Question 5The refractive index of diamond is 2.42. What is the meaning of this statement?

Two samples, each containing 400 g of water, are mixed. The temperature of sample A before mixing was 65∘C and that of sample B was 20∘C. What will be the final temperature of the mixture? (Specific heat of water = 4186 J/(kg.K)

In the given figure, where do the diverging rays seem to meet?(F1 ,F2 are the primary focus of the lens)

A certain quantity of gas occupied 100 mL whencollected over water at 15^° C and 750 mm pressure.It occupies 91.9 mL in dry state at NTP. Find thevapour pressure of water at 15^° C

The divergence of the vector field (x−y)^i+(y−x)^j+(x+y+z)^k is

10. The amount of ice that must be melt to decreasethe volume of an ice water mixture by 1 cm3, is\lbrack Density of ice = 0.9 g/cm3\rbrack m

The focal length of a plano - convex lens is equal to its radius of curvature of convex side. The value of the refractive index of its material is

1. Does light travel in vacume? 2. Why do we need tubelight and bulbs to see other objects? 3. Why can't we see in dark?

An electric heater is rated 200 Volt and 10 Amp. Calculate the resistance offered by the heater.

There is a rod of length I. The velocities of its twoends are V1 and v2 n opposite directions normal to rod. The angular velocity of rod is

Which is deviated more by a glass prism- red light or violet light?

what is terredtrial and galileo's telescope and fornormal adjustment?

40 g of water at 60°C is poured into a vessel containing 50 g of water at 20°C. The final temperature recorded is 30°C. The thermal capacity of the vessel is: [Take specific heat capacity of water as 4.2J g-1 oC-1]

34.At 0 degree Celsius the resistance of two wires are R1 and R2. The coefficient of Resistance are alpha1 and alpha2 .If the resistance are connected in series then equivalent resistance is how many times the coefficient of Resistance ?

1 kg piece of copper is drawn into a wire 1 m2 thick, and another 1 kg copper piece into a wire 2 m2 thick. Compare the resistance of these wires.

A body cools from 50^°C to 40^°C in10 minutes. How long will it take to cool from 40^°C to 30^°C. Of temperature of surrounding to be 30^°C? 1) 10 minutes 2) 12 minutes 3) 15 minutes 4) infinite time

A compound contains two elements ′X′ and ′Y′ in the ratio of Mass percentage of 50% each. Atomic mass of ′X′ is 20 and ′Y′ is 40. What can be its simplest formula?

A monochromatic beam of light passes from air into a glass block. An expression that relates the wavelength of light, with the speed of light in air and the speed of light in glass is:

(a) Two lenses have power of (i) + 2 D (ii) −4 D. What is the nature and focal length of each lens?​(b) An object is kept at a distance of 100 cm from each of the above lenses. Calculate the (i) image distance (ii) magnification in each of the two cases.

explain loudness versus intensity of sound graph in detai

A capacitor of capacitance C is given a charge Q. At t=0, it is connected to an uncharged capacitor of equal capacitance through a resistor R. The charge on second as a function of time is?

Work done in adiabatic process

What colours make up white light ?

Four identical point masses each equal to M are placed at the four corners of a square of side a. Calculate force of attraction on another point mass m1 kept at the centre of the square

(i) A ray of white light breaks up into its components while passing through a glass prism. Draw a ray diagram to show the path of rays. (ii) Mark the least deviated colour in your diagram. (iii) Why do different coloured rays devitate differently in prism ?

A bar magnet of length L and magnetic moment M is bent into the form of a semicircle. Now, its magnetic moment will be -

The spacing between the magnetic field lines _____ as we move away from the current carrying conductor.

An electric bulb (100W) which cosider as a point source whose efficiency is 2.5%. The electric field (peak value) produced by radiation coming from bulb at distance of 3m is?

Find the average current for the time interval t=0 to t=5 s if the current is given by, i=(2t+1) A.

A block of mass 3 kg lies at rest on an inclined plane of angle of inclination 30^°. The magnitude of the force exerted by the surface on the block is:________(g= 10 ms^{-2})

what is current loop?

(a) Two lenses have power of (i) + 2 D (ii) −4 D. What is the nature and focal length of each lens?(b) An object is kept at a distance of 100 cm from each of the above lenses. Calculate the (i) image distance (ii) magnification in each of the two cases.