16569 + Interview Questions in Physics Page 42 InterviewSolution

2051.	(a) Find the radius of the circular orbit of a satellitemoving with an angular speed equal to the angularspeed of earth's rotation. (b) If the satellite is directlyabove the north pole at some instant, find the time ittakes to come over the equatorial plane. Mass of theearth 6 x 10 kg.24
Answer» (a) Find the radius of the circular orbit of a satellitemoving with an angular speed equal to the angularspeed of earth's rotation. (b) If the satellite is directlyabove the north pole at some instant, find the time ittakes to come over the equatorial plane. Mass of theearth 6 x 10 kg.24

Discussion

2052.	In Asia, for which fuel does the proportion in the total energy demand decrease continuously over the period 1991-2011?
Answer» In Asia, for which fuel does the proportion in the total energy demand decrease continuously over the period 1991-2011?

Discussion

2053.	If a simple pendulum of length l and mass m has maximum angular displacement x , then find it's maximum kinetic energy .
Answer» If a simple pendulum of length l and mass m has maximum angular displacement x , then find it's maximum kinetic energy .

Discussion

2054.	6. What mass of Fe3O4 is required to obtain 2kg of Fe if the process is 90% efficient?
Answer» 6. What mass of Fe3O4 is required to obtain 2kg of Fe if the process is 90% efficient?

Discussion

2055.	The following circuit diagram shows the experimental set up for the study of dependence of current on potential difference. Which two circuit components are connected in series.
Answer» The following circuit diagram shows the experimental set up for the study of dependence of current on potential difference. Which two circuit components are connected in series.

2055.

The following circuit diagram shows the experimental set up for the study of dependence of current on potential difference. Which two circuit components are connected in series.

Answer»

The following circuit diagram shows the experimental set up for the study of dependence of current on potential difference. Which two circuit components are connected in series.

Discussion

2056.	Is it possible to have a parllel connection of electrode in case of second law of electrolysis.
Answer» Is it possible to have a parllel connection of electrode in case of second law of electrolysis.

Discussion

2057.	Which 4 R's principle should be adopted in order to avoid pollution due to plastics?
Answer» Which 4 R's principle should be adopted in order to avoid pollution due to plastics?

Discussion

2058.	The equation for a magnetic field line (in polar coordinates) in 2 dimensions is given by ___?
Answer» The equation for a magnetic field line (in polar coordinates) in 2 dimensions is given by ___?

Discussion

2059.	102.A solenoid wound over a rectangular frame. If all the linear dimensions of the frmae are increased by a factor of 3 and the number of turns per unit length remains the same, the self inductance increases by a factor of A 3 B 9 C 27 D 63
Answer» 102.A solenoid wound over a rectangular frame. If all the linear dimensions of the frmae are increased by a factor of 3 and the number of turns per unit length remains the same, the self inductance increases by a factor of A 3 B 9 C 27 D 63

Discussion

2060.	A charged particle enters a uniform magnetic field, parallel to the field, its Kinetic energy :
Answer» A charged particle enters a uniform magnetic field, parallel to the field, its Kinetic energy :

Discussion

2061.	64. A pendulum Bob of mass 10 raise to the power-2kg is raised to a height of 510 raise to the power-2m and then released. At the bottom of its swing, it picks up a mass 10 raise to the power-3kg. To what height will the combined mass rise?
Answer» 64. A pendulum Bob of mass 10 raise to the power-2kg is raised to a height of 510 raise to the power-2m and then released. At the bottom of its swing, it picks up a mass 10 raise to the power-3kg. To what height will the combined mass rise?

Discussion

2062.	Radius of current carrying coil is 'R'.If fractional decreases in field value w.r.t. to centre of coil for a near by axial point is 1%, then find axial postion of that point.
Answer» Radius of current carrying coil is 'R'.If fractional decreases in field value w.r.t. to centre of coil for a near by axial point is 1%, then find axial postion of that point.

Discussion

2063.	Define wavelength, frequency and time period.
Answer» Define wavelength, frequency and time period.

Discussion

2064.	A hydrogen like species (atomic number Z) is present in a higher excited state of quantum number n. This excited atom can make a transition to the first excited state by successive emission of two photons of energies 10.20 eV and 17.0 eV respectively. Alternatively, the atom from the same excited state can make a transition to the second excited state by successive emission of two photons of energy 4.25 eV and 5.95 eV respectively. Determine the value of n.
Answer» A hydrogen like species (atomic number $Z$ ) is present in a higher excited state of quantum number $n$ . This excited atom can make a transition to the first excited state by successive emission of two photons of energies $10.20 eV$ and $17.0 eV$ respectively. Alternatively, the atom from the same excited state can make a transition to the second excited state by successive emission of two photons of energy $4.25 eV$ and $5.95 eV$ respectively. Determine the value of $n$ .

Discussion

2065.	Question 6 The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem?
Answer» Question 6 The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem?

Discussion

2066.	What is the speed of light in a medium of refractive index 65 if its speed in air is 3,00,000 km/s ?
Answer» What is the speed of light in a medium of refractive index $\frac{6}{5}$ if its speed in air is 3,00,000 km/s ?

Discussion

2067.	The following four circuits have been made for studying the dependence of current on the potential difference across a resistor.The correct circuit is :(1) A(2) B(3) C(4) D
Answer» The following four circuits have been made for studying the dependence of current on the potential difference across a resistor. The correct circuit is : (1) A (2) B (3) C (4) D

Discussion

2068.	What is the meaning of power of accommodation and persistance of vision ?
Answer» What is the meaning of power of accommodation and persistance of vision ?

Discussion

2069.	Which among the following arrangement is true regarding the speed of light?
Answer» Which among the following arrangement is true regarding the speed of light?

Discussion

2070.	The velocity of light is 3.0 10 raise to 8 meter second -1.what is the value closest to the wavelength in nanometres of a quantum of light with frequency of 8 10 raise to 15 second -1
Answer» The velocity of light is 3.0 10 raise to 8 meter second -1.what is the value closest to the wavelength in nanometres of a quantum of light with frequency of 8 10 raise to 15 second -1

Discussion

2071.	A particle is projected with velocity 10 m/s at anangle of 60^° from ground. Then the verticalcomponent of velocity vector when instantaneousvelocity becomes perpendicular to initial velocity, is510()m/s(2)m/sV 3/3(4) 5 3 m/s(3) 5 m/s
Answer» A particle is projected with velocity 10 m/s at anangle of 60^° from ground. Then the verticalcomponent of velocity vector when instantaneousvelocity becomes perpendicular to initial velocity, is510()m/s(2)m/sV 3/3(4) 5 3 m/s(3) 5 m/s

Discussion

2072.	Q4. Which among the following initiatives focuses on improvement of research and innovations in the field of science and technology? 1. INSPIRE 2. KIRAN 3. IMPRINT India Select the correct answer using the code given below.
Answer» Q4. Which among the following initiatives focuses on improvement of research and innovations in the field of science and technology? 1. INSPIRE 2. KIRAN 3. IMPRINT India Select the correct answer using the code given below.

2072.

Q4. Which among the following initiatives focuses on improvement of research and innovations in the field of science and technology? 1. INSPIRE 2. KIRAN 3. IMPRINT India Select the correct answer using the code given below.

Answer»

Q4. Which among the following initiatives focuses on improvement of research and innovations in the field of science and technology?

1. INSPIRE 2. KIRAN

3. IMPRINT India

Select the correct answer using the code given below.

Discussion

2073.	How much current does an electric geyser draw from a 220 V source, if the resistance of the geyser is 110Ω?
Answer» How much current does an electric geyser draw from a 220 V source, if the resistance of the geyser is $110 Ω$ ?

Discussion

2074.	A 6 pole, 3-phase induction motor runs at a speed of 960 rpm with an input power of 40 kW. The stator copper loss at this operating conditions is 2 kW while rotational losses are 400 W. The electromagnetic torque developed is ______N-m.362.87
Answer» A 6 pole, 3-phase induction motor runs at a speed of 960 rpm with an input power of 40 kW. The stator copper loss at this operating conditions is 2 kW while rotational losses are 400 W. The electromagnetic torque developed is ______N-m. 362.87

Discussion

2075.	In the above figure, the distance between the point P and point F is
Answer» In the above figure, the distance between the point P and point F is

2075.

In the above figure, the distance between the point P and point F is

Answer»

In the above figure, the distance between the point P and point F is

Discussion

2076.	Question 8What is the difference between noise and music? Can music become noise sometimes?
Answer» Question 8 What is the difference between noise and music? Can music become noise sometimes?

Discussion

2077.	A block of mass M is attached to the lower end of a vertical spring. The spring is hung from a ceiling and has a force cons†an t value k. The mass is released from rest with the spring initiallt unstreched. The maximum extension produced in the length of the spring is
Answer» A block of mass M is attached to the lower end of a vertical spring. The spring is hung from a ceiling and has a force cons†an t value k. The mass is released from rest with the spring initiallt unstreched. The maximum extension produced in the length of the spring is

Discussion

2078.	A cannon of mass 1000 kg can fire a bolt of 20 kg with a muzzle velocity of 300ms. If the cannon is free to move, the backwards velocity of the cannon after the bolt is fired will be:
Answer» A cannon of mass 1000 kg can fire a bolt of 20 kg with a muzzle velocity of $300 \frac{m}{s}$ . If the cannon is free to move, the backwards velocity of the cannon after the bolt is fired will be:

Discussion

2079.	2 resistors of resistance r1=100+or-3and r2=200+or-4are connected in series and in parallel. Find equivalent resistance of the a) series combination B) parallel combination.
Answer» 2 resistors of resistance r1=100+or-3and r2=200+or-4are connected in series and in parallel. Find equivalent resistance of the a) series combination B) parallel combination.

Discussion

2080.	42. A 5 L cyclinder contained 10 moles of oxygen gas at 27 C.due to certain leakage through the hole all the gas escaped in to the atmoshere and the cyclinder got empty.if the atmospheric pressure is 1 atm. calculate the work done by the gas.
Answer» 42. A 5 L cyclinder contained 10 moles of oxygen gas at 27 C.due to certain leakage through the hole all the gas escaped in to the atmoshere and the cyclinder got empty.if the atmospheric pressure is 1 atm. calculate the work done by the gas.

Discussion

2081.	A camera fitted with a lens of focal length 50 mm is being used to photograph a flower that is 5 cm in diameter. The flower is placed 20 cm in front of the camera lens. (a) At what distance from the film should the lens be adjusted to obtain a sharp image of the flower ? (b) What would be the diameter of the image of the flower on the film ? . (c) What is the nature of camera lens ?
Answer» A camera fitted with a lens of focal length 50 mm is being used to photograph a flower that is 5 cm in diameter. The flower is placed 20 cm in front of the camera lens. (a) At what distance from the film should the lens be adjusted to obtain a sharp image of the flower ? (b) What would be the diameter of the image of the flower on the film ? . (c) What is the nature of camera lens ?

Discussion

2082.	A common transistor radio set requires 12 V (D.C.) for its operation. The D.C. source is constructed by using a transformer and a rectifier circuit, which are operated at 220 V (A.C.) on standard domestic A.C. supply. The number of turns of secondary coil are 24, then the number of turns of primary coil are
Answer» A common transistor radio set requires $12 V$ $(D . C .)$ for its operation. The $D . C .$ source is constructed by using a transformer and a rectifier circuit, which are operated at $220 V$ $(A . C .)$ on standard domestic $A . C .$ supply. The number of turns of secondary coil are $24$ , then the number of turns of primary coil are

Discussion

2083.	1012 α− particles (nuclei of helium) accumulate every second on a neutral conductor. Calculate the amount of time (in sec) in which the sphere gets charged by 1.6 μC.
Answer» $10^{12}$ $α -$ particles (nuclei of helium) accumulate every second on a neutral conductor. Calculate the amount of time $(in sec)$ in which the sphere gets charged by $1.6 μ C$ .

Discussion

2084.	The electric current flows in a conductor due to:
Answer» The electric current flows in a conductor due to:

Discussion

2085.	OA is an object with object size 4 cm and O'A' is the image of the object. If the distance of object and image from the optical center is 30cm and 15cm respectively. Find the height of the image formed.
Answer» OA is an object with object size $4 c m$ and O'A' is the image of the object. If the distance of object and image from the optical center is 30cm and 15cm respectively. Find the height of the image formed.

Discussion

2086.	A closely wound coil of 100 turns and area of cross-section 100 cm2 has a coefficient of self-induction 1 mH. What is the length of the solenoid?
Answer» A closely wound coil of $100$ turns and area of cross-section $100 {cm}^{2}$ has a coefficient of self-induction $1 mH$ . What is the length of the solenoid?

Discussion

2087.	Two bulbs P and Q are rated 100W, 220V and 50W, 220V respectively. They are connected in parallel across 220 V source. The current in the bulbs P and Q is respectively?
Answer» Two bulbs $P a n d Q$ are rated 100W, 220V and 50W, 220V respectively. They are connected in parallel across 220 V source. The current in the bulbs P and Q is respectively?

Discussion

2088.	A person stands in contact against the inner wall of { a rotor of radius r . The coefficient of friction between { the wall and the clothing is μ and the rotor is rotating about vertical axis. The minimum angular speed of the rotor so that the person does not slip downward is
Answer» A person stands in contact against the inner wall of { a rotor of radius r . The coefficient of friction between { the wall and the clothing is μ and the rotor is rotating about vertical axis. The minimum angular speed of the rotor so that the person does not slip downward is

Discussion

2089.	The quantities of heat required to raise the temperature of two metallic spheres of same mass having specific heat capacity S1 and S2 (3S1=4S2) through 1 K are in the ratio:
Answer» The quantities of heat required to raise the temperature of two metallic spheres of same mass having specific heat capacity $S_{1}$ and $S_{2} (3 S_{1} = 4 S_{2})$ through $1 K$ are in the ratio:

Discussion

2090.	a object is placed 36cm frim convex lens. a real image is formed 24cm from the lens . calculate the focal length of the lens
Answer» a object is placed 36cm frim convex lens. a real image is formed 24cm from the lens . calculate the focal length of the lens

Discussion

2091.	What do you add to distilled water for making it to conduct electricity?
Answer» What do you add to distilled water for making it to conduct electricity?

Discussion

2092.	Under certain cutting conditions, doubling the cutting speed reduces the tool life to (116)th of the original. Taylor's tool life index(n) for this tool-workpiece combination will be 0.25
Answer» Under certain cutting conditions, doubling the cutting speed reduces the tool life to ${(\frac{1}{16})}^{t h}$ of the original. Taylor's tool life index(n) for this tool-workpiece combination will be 0.25

Discussion

2093.	An object is placed 12 cm from a concave lens of focal length 20 cm. Determine the position of the image.
Answer» An object is placed $12 cm$ from a concave lens of focal length $20 cm$ . Determine the position of the image.

Discussion

2094.	The Z parameters Z11 and Z21 for the 2-port network in the figure are
Answer» The Z parameters $Z_{11}$ and $Z_{21}$ for the 2-port network in the figure are

Discussion

2095.	A hydro-power plant converts one form of energy into another. Name the two forms of energy.
Answer» A hydro-power plant converts one form of energy into another. Name the two forms of energy.

Discussion

2096.	If ω is a cube root of unity, then
Answer» If $ω$ is a cube root of unity, then

Discussion

2097.	An electric heater rated as 500watt operates 10 hrs per day..find the cost of operating device for 30 days at ₹4 per kwh
Answer» An electric heater rated as 500watt operates 10 hrs per day..find the cost of operating device for 30 days at ₹4 per kwh

Discussion

2098.	The co-ordinates of a triangle PQR are P(1, 2), Q(4, 6) and R(–2, –2). Three particles of masses 2 kg, 4 kg and m kg are placed at the vertices of the triangle. If the co-ordinates of the centre of mass are calculate the mass m.
Answer» The co-ordinates of a triangle PQR are P(1, 2), Q(4, 6) and R(–2, –2). Three particles of masses 2 kg, 4 kg and m kg are placed at the vertices of the triangle. If the co-ordinates of the centre of mass are calculate the mass m.

Discussion

2099.	List some of the methods used to determine very long distances.
Answer» List some of the methods used to determine very long distances.

Discussion

2100.	In the following diagram, R1 = 1 Ω , R2 = 20 Ω, R3 = 5 Ω and R4 = 5 Ω. Current through R2 = 20 Ω is 1 A. Calculate the total current given out by the battery and terminal voltage of the battery.
Answer» In the following diagram, R₁ = 1 Ω , R₂ = 20 Ω, R₃ = 5 Ω and R₄ = 5 Ω. Current through R₂ = 20 Ω is 1 A. Calculate the total current given out by the battery and terminal voltage of the battery.

2100.

In the following diagram, R1 = 1 Ω , R2 = 20 Ω, R3 = 5 Ω and R4 = 5 Ω. Current through R2 = 20 Ω is 1 A. Calculate the total current given out by the battery and terminal voltage of the battery.

Answer»

In the following diagram, R₁ = 1 Ω , R₂ = 20 Ω, R₃ = 5 Ω and R₄ = 5 Ω. Current through R₂ = 20 Ω is 1 A. Calculate the total current given out by the battery and terminal voltage of the battery.

Discussion

Explore topic-wise InterviewSolutions in .

(a) Find the radius of the circular orbit of a satellitemoving with an angular speed equal to the angularspeed of earth's rotation. (b) If the satellite is directlyabove the north pole at some instant, find the time ittakes to come over the equatorial plane. Mass of theearth 6 x 10 kg.24

In Asia, for which fuel does the proportion in the total energy demand decrease continuously over the period 1991-2011?

If a simple pendulum of length l and mass m has maximum angular displacement x , then find it's maximum kinetic energy .

6. What mass of Fe3O4 is required to obtain 2kg of Fe if the process is 90% efficient?

The following circuit diagram shows the experimental set up for the study of dependence of current on potential difference. Which two circuit components are connected in series.

Is it possible to have a parllel connection of electrode in case of second law of electrolysis.

Which 4 R's principle should be adopted in order to avoid pollution due to plastics?

The equation for a magnetic field line (in polar coordinates) in 2 dimensions is given by ___?

102.A solenoid wound over a rectangular frame. If all the linear dimensions of the frmae are increased by a factor of 3 and the number of turns per unit length remains the same, the self inductance increases by a factor of A 3 B 9 C 27 D 63

A charged particle enters a uniform magnetic field, parallel to the field, its Kinetic energy :

64. A pendulum Bob of mass 10 raise to the power-2kg is raised to a height of 510 raise to the power-2m and then released. At the bottom of its swing, it picks up a mass 10 raise to the power-3kg. To what height will the combined mass rise?

Radius of current carrying coil is 'R'.If fractional decreases in field value w.r.t. to centre of coil for a near by axial point is 1%, then find axial postion of that point.

Define wavelength, frequency and time period.

Question 6 The far point of a myopic person is 80 cm in front of the eye. What is the nature and power of the lens required to correct the problem?

What is the speed of light in a medium of refractive index 65 if its speed in air is 3,00,000 km/s ?

The following four circuits have been made for studying the dependence of current on the potential difference across a resistor.The correct circuit is :(1) A(2) B(3) C(4) D

What is the meaning of power of accommodation and persistance of vision ?

Which among the following arrangement is true regarding the speed of light?

The velocity of light is 3.0 10 raise to 8 meter second -1.what is the value closest to the wavelength in nanometres of a quantum of light with frequency of 8 10 raise to 15 second -1

A particle is projected with velocity 10 m/s at anangle of 60^° from ground. Then the verticalcomponent of velocity vector when instantaneousvelocity becomes perpendicular to initial velocity, is510()m/s(2)m/sV 3/3(4) 5 3 m/s(3) 5 m/s

Q4. Which among the following initiatives focuses on improvement of research and innovations in the field of science and technology? 1. INSPIRE 2. KIRAN 3. IMPRINT India Select the correct answer using the code given below.

How much current does an electric geyser draw from a 220 V source, if the resistance of the geyser is 110Ω?

A 6 pole, 3-phase induction motor runs at a speed of 960 rpm with an input power of 40 kW. The stator copper loss at this operating conditions is 2 kW while rotational losses are 400 W. The electromagnetic torque developed is ______N-m.362.87

In the above figure, the distance between the point P and point F is

Question 8What is the difference between noise and music? Can music become noise sometimes?

A block of mass M is attached to the lower end of a vertical spring. The spring is hung from a ceiling and has a force cons†an t value k. The mass is released from rest with the spring initiallt unstreched. The maximum extension produced in the length of the spring is

A cannon of mass 1000 kg can fire a bolt of 20 kg with a muzzle velocity of 300ms. If the cannon is free to move, the backwards velocity of the cannon after the bolt is fired will be:

2 resistors of resistance r1=100+or-3and r2=200+or-4are connected in series and in parallel. Find equivalent resistance of the a) series combination B) parallel combination.

42. A 5 L cyclinder contained 10 moles of oxygen gas at 27 C.due to certain leakage through the hole all the gas escaped in to the atmoshere and the cyclinder got empty.if the atmospheric pressure is 1 atm. calculate the work done by the gas.

1012 α− particles (nuclei of helium) accumulate every second on a neutral conductor. Calculate the amount of time (in sec) in which the sphere gets charged by 1.6 μC.

The electric current flows in a conductor due to:

OA is an object with object size 4 cm and O'A' is the image of the object. If the distance of object and image from the optical center is 30cm and 15cm respectively. Find the height of the image formed.

A closely wound coil of 100 turns and area of cross-section 100 cm2 has a coefficient of self-induction 1 mH. What is the length of the solenoid?

Two bulbs P and Q are rated 100W, 220V and 50W, 220V respectively. They are connected in parallel across 220 V source. The current in the bulbs P and Q is respectively?

A person stands in contact against the inner wall of { a rotor of radius r . The coefficient of friction between { the wall and the clothing is μ and the rotor is rotating about vertical axis. The minimum angular speed of the rotor so that the person does not slip downward is

The quantities of heat required to raise the temperature of two metallic spheres of same mass having specific heat capacity S1 and S2 (3S1=4S2) through 1 K are in the ratio:

a object is placed 36cm frim convex lens. a real image is formed 24cm from the lens . calculate the focal length of the lens

What do you add to distilled water for making it to conduct electricity?

Under certain cutting conditions, doubling the cutting speed reduces the tool life to (116)th of the original. Taylor's tool life index(n) for this tool-workpiece combination will be 0.25

An object is placed 12 cm from a concave lens of focal length 20 cm. Determine the position of the image.

The Z parameters Z11 and Z21 for the 2-port network in the figure are

A hydro-power plant converts one form of energy into another. Name the two forms of energy.

If ω is a cube root of unity, then

An electric heater rated as 500watt operates 10 hrs per day..find the cost of operating device for 30 days at ₹4 per kwh

The co-ordinates of a triangle PQR are P(1, 2), Q(4, 6) and R(–2, –2). Three particles of masses 2 kg, 4 kg and m kg are placed at the vertices of the triangle. If the co-ordinates of the centre of mass are calculate the mass m.

List some of the methods used to determine very long distances.

In the following diagram, R1 = 1 Ω , R2 = 20 Ω, R3 = 5 Ω and R4 = 5 Ω. Current through R2 = 20 Ω is 1 A. Calculate the total current given out by the battery and terminal voltage of the battery.