16569 + Interview Questions in Physics Page 40 InterviewSolution

1951.	A person with a myopic eye cannot see objects beyond 1.2 m distinctly. What should be the type of the corrective lens used to restore the proper vision? Explain with a diagram. [3 MARKS]
Answer» A person with a myopic eye cannot see objects beyond 1.2 m distinctly. What should be the type of the corrective lens used to restore the proper vision? Explain with a diagram. [3 MARKS]

Discussion

1952.	An object is placed at a distance equal to 2f in front of a convex lens. Draw a labelled ray diagram to show the formation of image. State two characteristics of the image formed.
Answer» An object is placed at a distance equal to 2f in front of a convex lens. Draw a labelled ray diagram to show the formation of image. State two characteristics of the image formed.

Discussion

1953.	The V-I characteristics of a diode is defined asi=⎧⎨⎩V−0.7500V≥0.70V<0.7The power absorbed by diode is ____mW.23.56
Answer» The V-I characteristics of a diode is defined as $i = ⎧ ⎨ ⎩ \begin{matrix} \frac{V - 0.7}{500} & V \geq 0.7 0 & V < 0.7 \end{matrix}$ The power absorbed by diode is ____mW. 23.56

Discussion

1954.	A string of length l is fixed at both ends. It is vibrating in its 3rd overtone with maximum amplitude a. The amplitude at a distance l3 from one end is
Answer» A string of length $l$ is fixed at both ends. It is vibrating in its $3^{r d}$ overtone with maximum amplitude $a$ . The amplitude at a distance $\frac{l}{3}$ from one end is

Discussion

1955.	23.Assuming that the silicon diode ( having negligible resistance ) , the current through the diode is ( knee voltage of silicon diode is 0.7 V ) ----- a) 0 b) 7 mA C) 2.3 mA d) 23 mA
Answer» 23.Assuming that the silicon diode ( having negligible resistance ) , the current through the diode is ( knee voltage of silicon diode is 0.7 V ) ----- a) 0 b) 7 mA C) 2.3 mA d) 23 mA

Discussion

1956.	If there had been one eye of the man, then
Answer» If there had been one eye of the man, then

Discussion

1957.	The specific latent heat of fusion of water is: (a) 80 cal g−1 (b) 2260 J g−1 (c) 80 J g−1 (d) 336 J kg−1
Answer» The specific latent heat of fusion of water is: (a) 80 cal $g^{- 1}$ (b) 2260 J $g^{- 1}$ (c) 80 J $g^{- 1}$ (d) 336 J $k g^{- 1}$

1957.

The specific latent heat of fusion of water is: (a) 80 cal g−1 (b) 2260 J g−1 (c) 80 J g−1 (d) 336 J kg−1

Answer»

The specific latent heat of fusion of water is:

(a) 80 cal $g^{- 1}$

(b) 2260 J $g^{- 1}$

(c) 80 J $g^{- 1}$

(d) 336 J $k g^{- 1}$

Discussion

1958.	Acc. to Boyle's low
Answer» Acc. to Boyle's low

Discussion

1959.	Which part of a bar magnet attracts more iron filings, and why?
Answer» Which part of a bar magnet attracts more iron filings, and why?

Discussion

1960.	Three wires of same material having lengths in ratioof 2 :3 :4 and mass in ratio 3 : 4 :5 areconnected in parallel combination across a V voltsupply, then the ratio of current flowing throughthem is
Answer» Three wires of same material having lengths in ratioof 2 :3 :4 and mass in ratio 3 : 4 :5 areconnected in parallel combination across a V voltsupply, then the ratio of current flowing throughthem is

Discussion

1961.	State whether the following statements are true or false : (a) The scattering away of red light makes the sky appear blue during the day time. (b) The scattering away of blue light makes the sun appear red at sunset.
Answer» State whether the following statements are true or false : (a) The scattering away of red light makes the sky appear blue during the day time. (b) The scattering away of blue light makes the sun appear red at sunset.

Discussion

1962.	The effective resistance of a parallel connection that consists of four wires of equal length, equal area of cross-section and same material is 0.25 Ω. What will be the effective resistance if they are connected in series?
Answer» The effective resistance of a parallel connection that consists of four wires of equal length, equal area of cross-section and same material is $0.25 Ω .$ What will be the effective resistance if they are connected in series?

Discussion

1963.	How do holes and electrons recombine when they are in Different bands in p-n junction diode (i.e. holes in valence band in p side and electrons in conduction band from n side)
Answer» How do holes and electrons recombine when they are in Different bands in p-n junction diode (i.e. holes in valence band in p side and electrons in conduction band from n side)

Discussion

1964.	The orbital velocity of satellite at a height R above the surface of Earth is v . The escape velocity from that location is
Answer» The orbital velocity of satellite at a height R above the surface of Earth is v . The escape velocity from that location is

Discussion

1965.	A gauge has a resistance of 120Ω & a gauge factor of 2.1 . It is shunted by a resistance of 100 kΩ. The equivalent strain will be indicated while gauge is shunted is
Answer» A gauge has a resistance of $120 Ω$ & a gauge factor of 2.1 . It is shunted by a resistance of $100 k Ω$ . The equivalent strain will be indicated while gauge is shunted is

Discussion

1966.	Three resistance 5 Ω, 5 Ω and 6 Ω are connected as shown in figure. If the point S divides the resistance 6 Ω into two equal halves, the resistance between points P and S is
Answer» Three resistance $5 Ω, 5 Ω$ and $6 Ω$ are connected as shown in figure. If the point $S$ divides the resistance $6 Ω$ into two equal halves, the resistance between points $P$ and $S$ is

Discussion

1967.	Which of the following statement(s) is/are true, regarding the electrical set-up for verification of Ohm's law?
Answer» Which of the following statement(s) is/are true, regarding the electrical set-up for verification of Ohm's law?

Discussion

1968.	A convex lens is a ________ and a concave lens is a _________.
Answer» A convex lens is a ________ and a concave lens is a _________.

Discussion

1969.	Why convex lens converge the ray of light and in convex mirror it diverge the ray of light.
Answer» Why convex lens converge the ray of light and in convex mirror it diverge the ray of light.

Discussion

1970.	Prove the Law of Conservation of Momentum.
Answer» Prove the Law of Conservation of Momentum.

Discussion

1971.	A piece of wire is bent through 1800 at its mid pointand the two halves are twisted together, then resistance is
Answer» A piece of wire is bent through 180⁰ at its mid pointand the two halves are twisted together, then resistance is

Discussion

1972.	If potential energy of a satellite is -2MJ , then the binding energy of satellite is (1) 1MJ (2) 2MJ (3) 8MJ (4) 4M
Answer» If potential energy of a satellite is -2MJ , then the binding energy of satellite is (1) 1MJ (2) 2MJ (3) 8MJ (4) 4M

Discussion

1973.	Deposition of the metal takes place on which electrode during electroplating?
Answer» Deposition of the metal takes place on which electrode during electroplating?

Discussion

1974.	When an object falls from a height, its speed, v metres per second after t seconds of fall, is given by the equation v = 9.8 t. Is the speed proportional to the time?
Answer» When an object falls from a height, its speed, v metres per second after t seconds of fall, is given by the equation v = 9.8 t. Is the speed proportional to the time?

Discussion

1975.	In fig shows a block and tackle system of pulleys used to lift a load . (a) How many strands of tackle are supporting the load ? (b) Draw arrows to represent tension T in each strand. (c) What is the mechanical advantage of the system ? (d) When load is pulled up by a distance 1 m, how far does the effort end move ? (e) How much effort is needed to lift a load of 100 N ?
Answer» In fig shows a block and tackle system of pulleys used to lift a load . (a) How many strands of tackle are supporting the load ? (b) Draw arrows to represent tension T in each strand. (c) What is the mechanical advantage of the system ? (d) When load is pulled up by a distance 1 m, how far does the effort end move ? (e) How much effort is needed to lift a load of 100 N ?

1975.

In fig shows a block and tackle system of pulleys used to lift a load . (a) How many strands of tackle are supporting the load ? (b) Draw arrows to represent tension T in each strand. (c) What is the mechanical advantage of the system ? (d) When load is pulled up by a distance 1 m, how far does the effort end move ? (e) How much effort is needed to lift a load of 100 N ?

Answer»

In fig shows a block and tackle system of pulleys used to lift a load .

(a) How many strands of tackle are supporting the load ?

(b) Draw arrows to represent tension T in each strand.

(c) What is the mechanical advantage of the system ?

(d) When load is pulled up by a distance 1 m, how far does the effort end move ?

(e) How much effort is needed to lift a load of 100 N ?

Discussion

1976.	The magnetic field of a bar magnet spreads ___.
Answer» The magnetic field of a bar magnet spreads ___.

Discussion

1977.	What is a neutron?
Answer» What is a neutron?

Discussion

1978.	A circuit contains two unequal resistances in parallel. Which of the following statements is true?
Answer» A circuit contains two unequal resistances in parallel. Which of the following statements is true?

Discussion

1979.	The ‘Blue Economy’ is an emerging concept which encourages better stewardship of our ocean or ‘blue’ resources. In this context, discuss how the blue economy goes beyond viewing the ocean economy solely as a mechanism for economic growth.
Answer» The ‘Blue Economy’ is an emerging concept which encourages better stewardship of our ocean or ‘blue’ resources. In this context, discuss how the blue economy goes beyond viewing the ocean economy solely as a mechanism for economic growth.

Discussion

1980.	Is it possible to change direct current into alternating current. if yes how?
Answer» Is it possible to change direct current into alternating current. if yes how?

Discussion

1981.	What are the main uses of coal and petroleum products?
Answer» What are the main uses of coal and petroleum products?

Discussion

1982.	The gravitational force between two objects is F. If masses of both the objects are halved without altering the distance between them, then the gravitational force would become:
Answer» The gravitational force between two objects is F. If masses of both the objects are halved without altering the distance between them, then the gravitational force would become:

Discussion

1983.	What is the significance of rms value of current in a circuit.
Answer» What is the significance of rms value of current in a circuit.

Discussion

1984.	A planet is orbiting the sun in an elliptical orbit. Let U denote the potential energy and K denote the kinetic energy of the planet at an arbitrary point on the orbit. Choose the correct statement.
Answer» A planet is orbiting the sun in an elliptical orbit. Let U denote the potential energy and K denote the kinetic energy of the planet at an arbitrary point on the orbit. Choose the correct statement.

Discussion

1985.	72.A satisfactory photographic print is obtained when the exposure time is 10 sec at a distance of 2m from a 60 cd lamp. The time of exposure required for the same quality print at a diatance of 4m from a 120 cd lamp is : 1. 5 sec 2. 10 sec 3. 15 sec 4. 20 sec
Answer» 72.A satisfactory photographic print is obtained when the exposure time is 10 sec at a distance of 2m from a 60 cd lamp. The time of exposure required for the same quality print at a diatance of 4m from a 120 cd lamp is : 1. 5 sec 2. 10 sec 3. 15 sec 4. 20 sec

Discussion

1986.	A block of mass m is hanging from the ceiling by a spring whose spring constant is k. Now the spring is pulled further down by x units. Find the spring force acting on the block at that instant?
Answer» A block of mass m is hanging from the ceiling by a spring whose spring constant is k. Now the spring is pulled further down by x units. Find the spring force acting on the block at that instant?

1986.

A block of mass m is hanging from the ceiling by a spring whose spring constant is k. Now the spring is pulled further down by x units. Find the spring force acting on the block at that instant?

Answer»

A block of mass m is hanging from the ceiling by a spring whose spring constant is k. Now the spring is pulled further down by x units.

Find the spring force acting on the block at that instant?

Discussion

1987.	A well stifred (1 L) solution of 0.1 M CUelectrolysed at 25^° C using copper electrodes witha current of 25 mA for 6 hours. If current efficiencyis 50%. At the end of the duration what would bethe concentration of copper ions in the solution?so.s
Answer» A well stifred (1 L) solution of 0.1 M CUelectrolysed at 25^° C using copper electrodes witha current of 25 mA for 6 hours. If current efficiencyis 50%. At the end of the duration what would bethe concentration of copper ions in the solution?so.s

Discussion

1988.	A kid pushes his toy of weight 100 grams along a distance of 5 m on the floor by applying a force of magnitude 9 N. What is the energy that has to be put in by the kid for displacing the toy? Is there any change in potential energy possessed by the toy?
Answer» A kid pushes his toy of weight $100 grams$ along a distance of $5 m$ on the floor by applying a force of magnitude $9 N$ . What is the energy that has to be put in by the kid for displacing the toy? Is there any change in potential energy possessed by the toy?

Discussion

1989.	Which of the following methods is used for sol destruction [CPMT 1988]
Answer» Which of the following methods is used for sol destruction [CPMT 1988]

1989.

Which of the following methods is used for sol destruction [CPMT 1988]

Answer»

Which of the following methods is used for sol destruction

[CPMT 1988]

Discussion

1990.	Draw a neat labelled ray diagram to show the formation of image by a magnifying glass. State three characteristics of the image.
Answer» Draw a neat labelled ray diagram to show the formation of image by a magnifying glass. State three characteristics of the image.

Discussion

1991.

Copy and complete the following table with the required information from the passage Points of comparison Internal Combustion Engine Electric Motors 1. Pollution 2. Engine efficiency 3. Peak power generation 4. Recharging 5. Maintenance

Answer»

Copy and complete the following table with the required information from the passage

Points of comparison		Internal Combustion	Engine Electric Motors
1.	Pollution
2.	Engine efficiency
3.	Peak power generation
4.	Recharging
5.	Maintenance

Discussion

1992.	71 The angle of diffraction 2theta for a first order nature was found to be (27 degree 8 min ) using X-rays of wavelength 2.29 angstrom .Calculate the distance between two diffracted planes. expain how to get angle value from degree min .
Answer» 71 The angle of diffraction 2theta for a first order nature was found to be (27 degree 8 min ) using X-rays of wavelength 2.29 angstrom .Calculate the distance between two diffracted planes. expain how to get angle value from degree min .

Discussion

1993.	When a ray of light travelling in glass enters into water obliquely : (a) it is refracted towards the normal (b) it is not refracted at all (c) it goes along the normal (d) it is refracted away from the normal
Answer» When a ray of light travelling in glass enters into water obliquely : (a) it is refracted towards the normal (b) it is not refracted at all (c) it goes along the normal (d) it is refracted away from the normal

Discussion

1994.	The above configuration shows three identical bulbs, grade them in order of their brightness.
Answer» The above configuration shows three identical bulbs, grade them in order of their brightness.

Discussion

1995.	Question 20If an electric iron of 1200 W is used for 30 minutes every day, find electric energy consumed in the month of April.
Answer» Question 20 If an electric iron of 1200 W is used for 30 minutes every day, find electric energy consumed in the month of April.

Discussion

1996.	A perfectly straight portion of a uniform rope has mass M and length L. At end A of the segment, the tension in the rope is Ta and at B it is Tb (Tb>Ta). Neglect effect of gravity and no contact force acts on the rope in between points A and B. The tension in the rope at distance L/5 from end A is:
Answer» A perfectly straight portion of a uniform rope has mass M and length L. At end A of the segment, the tension in the rope is Ta and at B it is Tb (Tb>Ta). Neglect effect of gravity and no contact force acts on the rope in between points A and B. The tension in the rope at distance L/5 from end A is:

Discussion

1997.	Question 3 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» Question 3 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

1998.	The device used for producing electric current is called a(a) generator(b) galvanometer(c) ammeter(d) motor
Answer» The device used for producing electric current is called a (a) generator (b) galvanometer (c) ammeter (d) motor

1998.

The device used for producing electric current is called a(a) generator(b) galvanometer(c) ammeter(d) motor

Answer»

The device used for producing electric current is called a

(a) generator

(b) galvanometer

(c) ammeter

(d) motor

Discussion

1999.	a string fixed at both ends is vibrating in a particular mode of vibration .vibration is such that a point on string is at maximum displacement and is at a disatnce of one fourth the length of the string from one end .the frequency of vibration in this mode is 200 hz .what will be the frequency of vibration when it vibrates in the next mod esuch that same point is at maximum displacement 1.20 2.400 3.500 4.600
Answer» a string fixed at both ends is vibrating in a particular mode of vibration .vibration is such that a point on string is at maximum displacement and is at a disatnce of one fourth the length of the string from one end .the frequency of vibration in this mode is 200 hz .what will be the frequency of vibration when it vibrates in the next mod esuch that same point is at maximum displacement 1.20 2.400 3.500 4.600

Discussion

2000.	Dimension of intensity of a wave
Answer» Dimension of intensity of a wave

Discussion

Explore topic-wise InterviewSolutions in .

A person with a myopic eye cannot see objects beyond 1.2 m distinctly. What should be the type of the corrective lens used to restore the proper vision? Explain with a diagram. [3 MARKS]

An object is placed at a distance equal to 2f in front of a convex lens. Draw a labelled ray diagram to show the formation of image. State two characteristics of the image formed.

The V-I characteristics of a diode is defined asi=⎧⎨⎩V−0.7500V≥0.70V&lt;0.7The power absorbed by diode is ____mW.23.56

A string of length l is fixed at both ends. It is vibrating in its 3rd overtone with maximum amplitude a. The amplitude at a distance l3 from one end is

23.Assuming that the silicon diode ( having negligible resistance ) , the current through the diode is ( knee voltage of silicon diode is 0.7 V ) ----- a) 0 b) 7 mA C) 2.3 mA d) 23 mA

If there had been one eye of the man, then

The specific latent heat of fusion of water is: (a) 80 cal g−1 (b) 2260 J g−1 (c) 80 J g−1 (d) 336 J kg−1

Acc. to Boyle's low

Which part of a bar magnet attracts more iron filings, and why?

Three wires of same material having lengths in ratioof 2 :3 :4 and mass in ratio 3 : 4 :5 areconnected in parallel combination across a V voltsupply, then the ratio of current flowing throughthem is

State whether the following statements are true or false : (a) The scattering away of red light makes the sky appear blue during the day time. (b) The scattering away of blue light makes the sun appear red at sunset.

The effective resistance of a parallel connection that consists of four wires of equal length, equal area of cross-section and same material is 0.25 Ω. What will be the effective resistance if they are connected in series?

How do holes and electrons recombine when they are in Different bands in p-n junction diode (i.e. holes in valence band in p side and electrons in conduction band from n side)

The orbital velocity of satellite at a height R above the surface of Earth is v . The escape velocity from that location is

A gauge has a resistance of 120Ω &amp; a gauge factor of 2.1 . It is shunted by a resistance of 100 kΩ. The equivalent strain will be indicated while gauge is shunted is

Three resistance 5 Ω, 5 Ω and 6 Ω are connected as shown in figure. If the point S divides the resistance 6 Ω into two equal halves, the resistance between points P and S is

Which of the following statement(s) is/are true, regarding the electrical set-up for verification of Ohm's law?

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

Why convex lens converge the ray of light and in convex mirror it diverge the ray of light.

Prove the Law of Conservation of Momentum.

A piece of wire is bent through 1800 at its mid pointand the two halves are twisted together, then resistance is

If potential energy of a satellite is -2MJ , then the binding energy of satellite is (1) 1MJ (2) 2MJ (3) 8MJ (4) 4M

Deposition of the metal takes place on which electrode during electroplating?

When an object falls from a height, its speed, v metres per second after t seconds of fall, is given by the equation v = 9.8 t. Is the speed proportional to the time?

The magnetic field of a bar magnet spreads ___.

What is a neutron?

A circuit contains two unequal resistances in parallel. Which of the following statements is true?

The ‘Blue Economy’ is an emerging concept which encourages better stewardship of our ocean or ‘blue’ resources. In this context, discuss how the blue economy goes beyond viewing the ocean economy solely as a mechanism for economic growth.

Is it possible to change direct current into alternating current. if yes how?

What are the main uses of coal and petroleum products?

The gravitational force between two objects is F. If masses of both the objects are halved without altering the distance between them, then the gravitational force would become:

What is the significance of rms value of current in a circuit.

A planet is orbiting the sun in an elliptical orbit. Let U denote the potential energy and K denote the kinetic energy of the planet at an arbitrary point on the orbit. Choose the correct statement.

72.A satisfactory photographic print is obtained when the exposure time is 10 sec at a distance of 2m from a 60 cd lamp. The time of exposure required for the same quality print at a diatance of 4m from a 120 cd lamp is : 1. 5 sec 2. 10 sec 3. 15 sec 4. 20 sec

A block of mass m is hanging from the ceiling by a spring whose spring constant is k. Now the spring is pulled further down by x units. Find the spring force acting on the block at that instant?

A well stifred (1 L) solution of 0.1 M CUelectrolysed at 25^° C using copper electrodes witha current of 25 mA for 6 hours. If current efficiencyis 50%. At the end of the duration what would bethe concentration of copper ions in the solution?so.s

A kid pushes his toy of weight 100 grams along a distance of 5 m on the floor by applying a force of magnitude 9 N. What is the energy that has to be put in by the kid for displacing the toy? Is there any change in potential energy possessed by the toy?

Which of the following methods is used for sol destruction [CPMT 1988]

Draw a neat labelled ray diagram to show the formation of image by a magnifying glass. State three characteristics of the image.

Copy and complete the following table with the required information from the passage Points of comparison Internal Combustion Engine Electric Motors 1. Pollution 2. Engine efficiency 3. Peak power generation 4. Recharging 5. Maintenance

71 The angle of diffraction 2theta for a first order nature was found to be (27 degree 8 min ) using X-rays of wavelength 2.29 angstrom .Calculate the distance between two diffracted planes. expain how to get angle value from degree min .

When a ray of light travelling in glass enters into water obliquely : (a) it is refracted towards the normal (b) it is not refracted at all (c) it goes along the normal (d) it is refracted away from the normal

The above configuration shows three identical bulbs, grade them in order of their brightness.

Question 20If an electric iron of 1200 W is used for 30 minutes every day, find electric energy consumed in the month of April.

A perfectly straight portion of a uniform rope has mass M and length L. At end A of the segment, the tension in the rope is Ta and at B it is Tb (Tb>Ta). Neglect effect of gravity and no contact force acts on the rope in between points A and B. The tension in the rope at distance L/5 from end A is:

Question 3 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?

The device used for producing electric current is called a(a) generator(b) galvanometer(c) ammeter(d) motor

Dimension of intensity of a wave

The V-I characteristics of a diode is defined asi=⎧⎨⎩V−0.7500V≥0.70V<0.7The power absorbed by diode is ____mW.23.56

A gauge has a resistance of 120Ω & a gauge factor of 2.1 . It is shunted by a resistance of 100 kΩ. The equivalent strain will be indicated while gauge is shunted is

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