16569 + Interview Questions in Physics Page 18 InterviewSolution

851.	What are infrared radiations ? How are they detected ? State one uses of these radiations.
Answer» What are infrared radiations ? How are they detected ? State one uses of these radiations.

Discussion

852.	I have two resistors of R1 and R2 connected across voltage source of voltage V .now why don't all the voltage drop V does not drop across R1.?
Answer» I have two resistors of R1 and R2 connected across voltage source of voltage V .now why don't all the voltage drop V does not drop across R1.?

Discussion

853.	If your eye glasses have focal length +60 cm, what is your near point?
Answer» If your eye glasses have focal length +60 cm, what is your near point?

Discussion

854.	Part of the eye that helps create a sharp, focussed image on the retina.
Answer» Part of the eye that helps create a sharp, focussed image on the retina.

Discussion

855.	The distance of separation between two bodies affects the magnitude of the non-contact force between them such that
Answer» The distance of separation between two bodies affects the magnitude of the non-contact force between them such that

Discussion

856.	Question 1The human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to:(a) presbyopia(b) accommodation(c) far-sightedness(d) near-sightedness
Answer» Question 1 The human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to: (a) presbyopia (b) accommodation (c) far-sightedness (d) near-sightedness

Discussion

857.	A plate of thickness t is made up of a material of refractive index μ. It is placed in front of one of the slits, in a double-slit experiment. What should be the minimum thickness t of the plate, which will make the intensity at the center of the fringe pattern zero ?
Answer» A plate of thickness $t$ is made up of a material of refractive index $μ$ . It is placed in front of one of the slits, in a double-slit experiment. What should be the minimum thickness $t$ of the plate, which will make the intensity at the center of the fringe pattern zero ?

Discussion

858.	A spring of force constant K is cut into length of ratio 1:2:3 they are connected in series and new force constant K' then they are connected in parallel and force constant is k" then the ratio k':k".
Answer» A spring of force constant K is cut into length of ratio 1:2:3 they are connected in series and new force constant K' then they are connected in parallel and force constant is k" then the ratio k':k".

Discussion

859.	An oscilloscope input impedance consists of 1MΩ resistance connected in parallel with a 100pF capacitor. A compensted 20:1 attenuator is obtained by connecting a parallel combination of ___.
Answer» An oscilloscope input impedance consists of $1 M Ω$ resistance connected in parallel with a $100 p F$ capacitor. A compensted $20 : 1$ attenuator is obtained by connecting a parallel combination of ___.

Discussion

860.	two small bar magnets are placed in a line at certain dis†an ce d apart . if the length ofeach magnet is negligible compared to d , the force between them will be inversely proportional to a. d^2 b. d c. d^3 d. d^4
Answer» two small bar magnets are placed in a line at certain dis†an ce d apart . if the length ofeach magnet is negligible compared to d , the force between them will be inversely proportional to a. d^2 b. d c. d^3 d. d^4

Discussion

861.	Which of the following statement is true for TIR?
Answer» Which of the following statement is true for TIR?

Discussion

862.	Same current I is flowing in three infinitely long wire along positive x,y and z-directions. The magnetic field at a point(0,0,-a)would be?
Answer» Same current I is flowing in three infinitely long wire along positive x,y and z-directions. The magnetic field at a point(0,0,-a)would be?

Discussion

863.	(a) Define the unit of resistance (or Define the unit "ohm"). (b) What happens to the resistance as the conductor is made thinner? (c) Keeping the potential difference constant, the resistance of a circuit is doubled. By how much does the current change?
Answer» (a) Define the unit of resistance (or Define the unit "ohm"). (b) What happens to the resistance as the conductor is made thinner? (c) Keeping the potential difference constant, the resistance of a circuit is doubled. By how much does the current change?

Discussion

864.	Why slope directly proportional to inverse of heat capacity
Answer» Why slope directly proportional to inverse of heat capacity

Discussion

865.	Difference between kilowatt and kilowatt hour.
Answer» Difference between kilowatt and kilowatt hour.

Discussion

866.	Calculate the ratio resistances of two wires having same lengths but thickness or radius in the ratio 1:2.
Answer» Calculate the ratio resistances of two wires having same lengths but thickness or radius in the ratio 1:2.

Discussion

867.	Why it is said that charges always occur in pairs?
Answer» Why it is said that charges always occur in pairs?

Discussion

868.	A voltmeter has a least count of 0.1V and an ammeter has least count of 0.1 A .The potential drop V across a resistor is measured as 10.0V and current through it is measured as 1.0A The value of resistance with error is
Answer» A voltmeter has a least count of 0.1V and an ammeter has least count of 0.1 A .The potential drop V across a resistor is measured as 10.0V and current through it is measured as 1.0A The value of resistance with error is

Discussion

869.	Draw the following diagram in your answer book and show the formation of image with the help of suitable rays :
Answer» Draw the following diagram in your answer book and show the formation of image with the help of suitable rays :

869.

Draw the following diagram in your answer book and show the formation of image with the help of suitable rays :

Answer»

Draw the following diagram in your answer book and show the formation of image with the help of suitable rays :

Discussion

870.	Resistance of a metal wire of length 1m is 26 ohm at room temperature. If diameter of wire is 0.3 mm, find the resistivity of the wire.
Answer» Resistance of a metal wire of length 1m is 26 ohm at room temperature. If diameter of wire is 0.3 mm, find the resistivity of the wire.

Discussion

871.	An oil drop of radius r and density d is stationary in a uniform vertically upwards electric fiels E.If d'(
Answer» An oil drop of radius r and density d is stationary in a uniform vertically upwards electric fiels E.If d'(

Discussion

872.	What must be the temperature in Fahrenheit so that it will be twice its value in Celsius?
Answer» What must be the temperature in Fahrenheit so that it will be twice its value in Celsius?

Discussion

873.	Calculate the amount of electrical energy consumption for a month of 30 days in household of 220 V line with the following appliances being used: (a) five 60 W bulb for six hours. (b) two 1000W heater for 2 hours. (c) 750 w electric iron for 2 hours.(d) 100W refrigerator for 24 hours. (e) 1100W microwave oven for 3hours. The cost of first 200 units is Rs 2.40 and next 200 units is rupees 3.90 per unit respectively .
Answer» Calculate the amount of electrical energy consumption for a month of 30 days in household of 220 V line with the following appliances being used: (a) five 60 W bulb for six hours. (b) two 1000W heater for 2 hours. (c) 750 w electric iron for 2 hours.(d) 100W refrigerator for 24 hours. (e) 1100W microwave oven for 3hours. The cost of first 200 units is Rs 2.40 and next 200 units is rupees 3.90 per unit respectively .

Discussion

874.	203/ A man in a boat A pulls a rope with a force 100 N.The other end of the rope is tied to a boat B ofmass 200 kg. The total mass of boat A and manis 300 kg, disregard the weight of the rope and theresistance of the water. The power developed bythe man by the end of the third second is(1) 100 W2) 200 W(3) 150 W(4) 250 W(Andhra Pradesh, Stage-l, 2016-17)
Answer» 203/ A man in a boat A pulls a rope with a force 100 N.The other end of the rope is tied to a boat B ofmass 200 kg. The total mass of boat A and manis 300 kg, disregard the weight of the rope and theresistance of the water. The power developed bythe man by the end of the third second is(1) 100 W2) 200 W(3) 150 W(4) 250 W(Andhra Pradesh, Stage-l, 2016-17)

Discussion

875.	Question 31Draw ray diagrams showing the image formation by a convex lens when an object is placed(a) between optical centre and focus of the lens (b) between focus and twice the focal length of the lens (c) at twice the focal length of the lens (d) at infinity (e) at the focus of the lens
Answer» Question 31 Draw ray diagrams showing the image formation by a convex lens when an object is placed (a) between optical centre and focus of the lens (b) between focus and twice the focal length of the lens (c) at twice the focal length of the lens (d) at infinity (e) at the focus of the lens

Discussion

876.	Question 5 The pH of water sample collected from a river was found to be acidic in the range of 3.5 – 4.5, on the banks of the river were several factories that were discharging effluents into the river. The effluents of which one of the following factories is the most likely the cause for lowering the pH of river water? (a) Soap and detergent factory (b) Lead battery manufacturing factory (c) Plastic cup manufacturing factory (d) Alcohol distillery
Answer» Question 5 The pH of water sample collected from a river was found to be acidic in the range of 3.5 – 4.5, on the banks of the river were several factories that were discharging effluents into the river. The effluents of which one of the following factories is the most likely the cause for lowering the pH of river water? (a) Soap and detergent factory (b) Lead battery manufacturing factory (c) Plastic cup manufacturing factory (d) Alcohol distillery

Discussion

877.	If you take water of mass 'm' and specific heat 's' in one container and raise its temperature from 20°C to 60°C and oil that has a mass of '2m' and a specific heat of '2s' in another container and raise its temperature form 20°C to 40 °C, what will be the ratio of heat supplied to the water to the heat supplied to the oil?
Answer» If you take water of mass 'm' and specific heat 's' in one container and raise its temperature from 20°C to 60°C and oil that has a mass of '2m' and a specific heat of '2s' in another container and raise its temperature form 20°C to 40 °C, what will be the ratio of heat supplied to the water to the heat supplied to the oil?

Discussion

878.	Classify the following as a lever, a pulley and an inclined plane :A wedge, a needle, a staircase, a slide, the wheel of a flagpole, nutcrackers, scissors, an opener, an axe, a crane, a knife.
Answer» Classify the following as a lever, a pulley and an inclined plane : A wedge, a needle, a staircase, a slide, the wheel of a flagpole, nutcrackers, scissors, an opener, an axe, a crane, a knife.

Discussion

879.	Identify the condition, which will form enlarged, virtual and erect image.
Answer» Identify the condition, which will form enlarged, virtual and erect image.

Discussion

880.	Why does refraction through a prism bring out a band of seven colours but refraction through a glass slab doesn't?
Answer» Why does refraction through a prism bring out a band of seven colours but refraction through a glass slab doesn't?

Discussion

881.	A stone dropped from the top of a tower of height 125 m splashes into a pond of water at its base. When will the sound of the splash be heard at the top? (Take velocity of sound = 340 ms−1 and g = 10 ms−2)
Answer» A stone dropped from the top of a tower of height $125 m$ splashes into a pond of water at its base. When will the sound of the splash be heard at the top? (Take velocity of sound = $340 m s^{- 1}$ and g = $10 m s^{- 2}$ )

Discussion

882.	62. In ydse amplitude of two sources 3a and a resp. The ratio of intensities of bright and dark fringe will be
Answer» 62. In ydse amplitude of two sources 3a and a resp. The ratio of intensities of bright and dark fringe will be

Discussion

883.	A wire of uniform resistance R is bent in the form of equilateral triangle. Find the equivalent resistance between ends of two sides.
Answer» A wire of uniform resistance R is bent in the form of equilateral triangle. Find the equivalent resistance between ends of two sides.

Discussion

884.	Explain the construction of Galileo’s telescope.
Answer» Explain the construction of Galileo’s telescope.

Discussion

885.	An object is placed at a distance of 6 cm from a convex mirror of focal length 12 cm. Find the position and nature of the image.
Answer» An object is placed at a distance of 6 cm from a convex mirror of focal length 12 cm. Find the position and nature of the image.

Discussion

886.	Which part of the human eye is responsible of rendering different eye colour for different human beings?
Answer» Which part of the human eye is responsible of rendering different eye colour for different human beings?

Discussion

887.	Provethat gravity at centre of earth is zero.
Answer» Provethat gravity at centre of earth is zero.

Discussion

888.	Question 1What is the audible range of the average human ear?
Answer» Question 1 What is the audible range of the average human ear?

Discussion

889.	An electric kettle has two heating filaments. One brings it to boil in 10 min and the other in 15 min when they are connected across the same potential difference. If the two heating filaments are connected in parallel, then water in kettle will boil in
Answer» An electric kettle has two heating filaments. One brings it to boil in $10 min$ and the other in $15 min$ when they are connected across the same potential difference. If the two heating filaments are connected in parallel, then water in kettle will boil in

Discussion

890.	Integration on tanz
Answer» Integration on tanz

Discussion

891.	Alum is used to purify water since it acts as
Answer» Alum is used to purify water since it acts as

Discussion

892.

Have you read novels or short stories about life on other planets? What is this type of writing called?Read the following extract from a letter received by someone on Earth from another planet.Planet Aurigae II Dear Pen Pal, When I received your letter from the interstellar correspondence club, my first impulse was to ignore it. However, your description of Earth sounds exciting. I would like to live there for a while, and I have… 1. What does the letter suggest about its writer?2. What do you think may happen between the writer and Pen Pal?

Answer»

Have you read novels or short stories about life on other planets? What is this type of writing called?

Read the following extract from a letter received by someone on Earth from another planet.

Planet Aurigae II

Dear Pen Pal,

When I received your letter from the interstellar correspondence club, my first impulse was to ignore it. However, your description of Earth sounds exciting. I would like to live there for a while, and I have…

1. What does the letter suggest about its writer?

2. What do you think may happen between the writer and Pen Pal?

Discussion

893.	A concave mirror has a focal length of 25 cm. At which of the following distance should a person hold his face from this concave mirror so that it may act as a shaving mirror ? (a) 45 cm (b) 20 cm (c) 25 cm (d) 30 cm Give reason for your choice.
Answer» A concave mirror has a focal length of 25 cm. At which of the following distance should a person hold his face from this concave mirror so that it may act as a shaving mirror ? (a) 45 cm (b) 20 cm (c) 25 cm (d) 30 cm Give reason for your choice.

Discussion

894.	Answer the following:a. What is meant by latent heat? How will the state of matter transform if latent heat is given off?b Which principle is used to measure the specific heat capacity of a substance?c. Explain the role of latent heat in the change of state of a substances?d. On what basis and how will you determine whether air is saturated with vapour or not?
Answer» Answer the following: a. What is meant by latent heat? How will the state of matter transform if latent heat is given off? b Which principle is used to measure the specific heat capacity of a substance? c. Explain the role of latent heat in the change of state of a substances? d. On what basis and how will you determine whether air is saturated with vapour or not?

Discussion

895.	An old person is using a spectacle having bifocal lenses. The power of the two lenses L1 and L2 is +2D and -1D . Then the range within which he can see clearly is
Answer» An old person is using a spectacle having bifocal lenses. The power of the two lenses L1 and L2 is +2D and -1D . Then the range within which he can see clearly is

Discussion

896.	Why does the sun appear yellowish-white during the noontime?
Answer» Why does the sun appear yellowish-white during the noontime?

Discussion

897.	An irregular crystal structure reflects all the light that falls on it as shown in the diagram.Which of the following statement is true?
Answer» An irregular crystal structure reflects all the light that falls on it as shown in the diagram. Which of the following statement is true?

897.

An irregular crystal structure reflects all the light that falls on it as shown in the diagram.Which of the following statement is true?

Answer»

An irregular crystal structure reflects all the light that falls on it as shown in the diagram.

Which of the following statement is true?

Discussion

898.	A straight conductor PQ is placed in a magnetic field →B=(ky)^i where k is a constant. What will be force acting on the conductor PQ if k=5 in SI units and I=10 A
Answer» A straight conductor $PQ$ is placed in a magnetic field $\to B = (k y)^i$ where $k$ is a constant. What will be force acting on the conductor $PQ$ if $k = 5$ in SI units and $I = 10 A$

Discussion

899.	What is Krolls process?
Answer» What is Krolls process?

Discussion

900.	21.How many NOR gates are required to form NAND gate?
Answer» 21.How many NOR gates are required to form NAND gate?

Discussion

Explore topic-wise InterviewSolutions in .

What are infrared radiations ? How are they detected ? State one uses of these radiations.

I have two resistors of R1 and R2 connected across voltage source of voltage V .now why don't all the voltage drop V does not drop across R1.?

If your eye glasses have focal length +60 cm, what is your near point?

Part of the eye that helps create a sharp, focussed image on the retina.

The distance of separation between two bodies affects the magnitude of the non-contact force between them such that

Question 1The human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to:(a) presbyopia(b) accommodation(c) far-sightedness(d) near-sightedness

A plate of thickness t is made up of a material of refractive index μ. It is placed in front of one of the slits, in a double-slit experiment. What should be the minimum thickness t of the plate, which will make the intensity at the center of the fringe pattern zero ?

A spring of force constant K is cut into length of ratio 1:2:3 they are connected in series and new force constant K' then they are connected in parallel and force constant is k" then the ratio k':k".

An oscilloscope input impedance consists of 1MΩ resistance connected in parallel with a 100pF capacitor. A compensted 20:1 attenuator is obtained by connecting a parallel combination of ___.

two small bar magnets are placed in a line at certain dis†an ce d apart . if the length ofeach magnet is negligible compared to d , the force between them will be inversely proportional to a. d^2 b. d c. d^3 d. d^4

Which of the following statement is true for TIR?

Same current I is flowing in three infinitely long wire along positive x,y and z-directions. The magnetic field at a point(0,0,-a)would be?

(a) Define the unit of resistance (or Define the unit "ohm"). (b) What happens to the resistance as the conductor is made thinner? (c) Keeping the potential difference constant, the resistance of a circuit is doubled. By how much does the current change?

Why slope directly proportional to inverse of heat capacity

Difference between kilowatt and kilowatt hour.

Calculate the ratio resistances of two wires having same lengths but thickness or radius in the ratio 1:2.

Why it is said that charges always occur in pairs?

A voltmeter has a least count of 0.1V and an ammeter has least count of 0.1 A .The potential drop V across a resistor is measured as 10.0V and current through it is measured as 1.0A The value of resistance with error is

Draw the following diagram in your answer book and show the formation of image with the help of suitable rays :

Resistance of a metal wire of length 1m is 26 ohm at room temperature. If diameter of wire is 0.3 mm, find the resistivity of the wire.

An oil drop of radius r and density d is stationary in a uniform vertically upwards electric fiels E.If d'(

What must be the temperature in Fahrenheit so that it will be twice its value in Celsius?

Question 31Draw ray diagrams showing the image formation by a convex lens when an object is placed(a) between optical centre and focus of the lens (b) between focus and twice the focal length of the lens (c) at twice the focal length of the lens (d) at infinity (e) at the focus of the lens

Classify the following as a lever, a pulley and an inclined plane :A wedge, a needle, a staircase, a slide, the wheel of a flagpole, nutcrackers, scissors, an opener, an axe, a crane, a knife.

Identify the condition, which will form enlarged, virtual and erect image.

Why does refraction through a prism bring out a band of seven colours but refraction through a glass slab doesn't?

A stone dropped from the top of a tower of height 125 m splashes into a pond of water at its base. When will the sound of the splash be heard at the top? (Take velocity of sound = 340 ms−1 and g = 10 ms−2)

62. In ydse amplitude of two sources 3a and a resp. The ratio of intensities of bright and dark fringe will be

A wire of uniform resistance R is bent in the form of equilateral triangle. Find the equivalent resistance between ends of two sides.

Explain the construction of Galileo’s telescope.

An object is placed at a distance of 6 cm from a convex mirror of focal length 12 cm. Find the position and nature of the image.

Which part of the human eye is responsible of rendering different eye colour for different human beings?

Provethat gravity at centre of earth is zero.

Question 1What is the audible range of the average human ear?

An electric kettle has two heating filaments. One brings it to boil in 10 min and the other in 15 min when they are connected across the same potential difference. If the two heating filaments are connected in parallel, then water in kettle will boil in

Integration on tanz

Alum is used to purify water since it acts as

A concave mirror has a focal length of 25 cm. At which of the following distance should a person hold his face from this concave mirror so that it may act as a shaving mirror ? (a) 45 cm (b) 20 cm (c) 25 cm (d) 30 cm Give reason for your choice.

An old person is using a spectacle having bifocal lenses. The power of the two lenses L1 and L2 is +2D and -1D . Then the range within which he can see clearly is

Why does the sun appear yellowish-white during the noontime?

An irregular crystal structure reflects all the light that falls on it as shown in the diagram.Which of the following statement is true?

A straight conductor PQ is placed in a magnetic field →B=(ky)^i where k is a constant. What will be force acting on the conductor PQ if k=5 in SI units and I=10 A

What is Krolls process?

21.How many NOR gates are required to form NAND gate?