13232 + Interview Questions in Physics Page 36 InterviewSolution

1751.	A wire carrying current i is lying on a smooth imclined fixed wedge of angle of inclinationθ, magnetic feild is normal to the plane. find magnetic feild require to keep wire under equilibrium take mass of wire as m ignore earths magnetic feild.
Answer» A wire carrying current i is lying on a smooth imclined fixed wedge of angle of inclinationθ, magnetic feild is normal to the plane. find magnetic feild require to keep wire under equilibrium take mass of wire as m ignore earths magnetic feild.

Discussion

1752.	(a) What is meant by uniform circular motion? Give two examples of uniform circular motion. (b) The tip of seconds' hand of a clock takes 60 seconds to move once on the circular dial of the clock. If the radius of the dial of the clock is 10.5 cm, calculate the speed of the tip of the second's hand of the clock. (Givenπ=227).
Answer» (a) What is meant by uniform circular motion? Give two examples of uniform circular motion. (b) The tip of seconds' hand of a clock takes 60 seconds to move once on the circular dial of the clock. If the radius of the dial of the clock is 10.5 cm, calculate the speed of the tip of the second's hand of the clock. ( $G i v e n π = \frac{22}{7}$ ).

1752.

(a) What is meant by uniform circular motion? Give two examples of uniform circular motion. (b) The tip of seconds' hand of a clock takes 60 seconds to move once on the circular dial of the clock. If the radius of the dial of the clock is 10.5 cm, calculate the speed of the tip of the second's hand of the clock. (Givenπ=227).

Answer»

(a) What is meant by uniform circular motion? Give two examples of uniform circular motion.

(b) The tip of seconds' hand of a clock takes 60 seconds to move once on the circular dial of the clock. If the radius of the dial of the clock is 10.5 cm, calculate the speed of the tip of the second's hand of the clock. ( $G i v e n π = \frac{22}{7}$ ).

Discussion

1753.	Question 30If on increasing a,b decreases in such a manner that___remains ___and positive, then a and b are said to vary inversely with each other.
Answer» Question 30 If on increasing a,b decreases in such a manner that___remains ___and positive, then a and b are said to vary inversely with each other.

1753.

Question 30If on increasing a,b decreases in such a manner that_remains _and positive, then a and b are said to vary inversely with each other.

Answer»

Question 30

If on increasing a,b decreases in such a manner that___remains ___and positive, then a and b are said to vary inversely with each other.

Discussion

1754.	Calculate the amount of work done required in moving 5×1020 electrons across two points of a wire with a potential difference of 8 V.
Answer» Calculate the amount of work done required in moving $5 \times 10^{20}$ electrons across two points of a wire with a potential difference of $8 V$ .

Discussion

1755.	If c is the speed of light in vacuum and v is the speed of light in the given medium, the absolute refractive index(n) of a medium is given as .
Answer» If c is the speed of light in vacuum and v is the speed of light in the given medium, the absolute refractive index(n) of a medium is given as .

Discussion

1756.	From the graph between current I and voltage V shown in figure, identify the portion corresponding to negative resistance.
Answer» From the graph between current I and voltage V shown in figure, identify the portion corresponding to negative resistance.

Discussion

1757.	State whether thrust is a scalar or vector ?
Answer» State whether thrust is a scalar or vector ?

Discussion

1758.	Two rings having the same radius R and mass M are placed such that their centres are at a common point and their planes are perpendicular to each other.Find the moment of inertia of the system about an axis passing through the center and perpendicular to the plane of one of the rings?
Answer» Two rings having the same radius R and mass M are placed such that their centres are at a common point and their planes are perpendicular to each other.Find the moment of inertia of the system about an axis passing through the center and perpendicular to the plane of one of the rings?

Discussion

1759.	61.a man walks along a circular path of radius r from point A to B as shown in the figure. The displacement traversed by the man will be a.2R b. Sq. root of 3 c.Sq. root of 2 d.R
Answer» 61.a man walks along a circular path of radius r from point A to B as shown in the figure. The displacement traversed by the man will be a.2R b. Sq. root of 3 c.Sq. root of 2 d.R

Discussion

1760.	A particle moves in straight line with velocity 6 m/s and 3 m/s for time intervals which are in the ratio 1:2. Find average velocity of the particle.
Answer» A particle moves in straight line with velocity $6 m/s$ and $3 m/s$ for time intervals which are in the ratio $1 : 2$ . Find average velocity of the particle.

Discussion

1761.	How many orbits of multielectron atom or ion can have `2>n+l>4?
Answer» How many orbits of multielectron atom or ion can have `2>n+l>4?

Discussion

1762.	Question 7 A ball is gently dropped from a height of 20 m. If its velocity increases uniformly at the rate of 10 ms−2, with what velocity will it strike the ground? After what time will it strike the ground?
Answer» Question 7 A ball is gently dropped from a height of 20 m. If its velocity increases uniformly at the rate of 10 $m s^{- 2}$ , with what velocity will it strike the ground? After what time will it strike the ground?

Discussion

1763.	A student took solid bodies of different shapes, sizes and materials and noted down the apparent loss in weight on partially or fully immersing the bodies in different liquids. Based on the observations, he wrote the following conclusions. Which statement is incorrect and why?a) Upthrust depends on the volume of the body immersed and density of the liquidb) Upthrust increases as the body goes deeper inside the liquidc) Upthrust depends on the acceleration due to gravity and density of the liquidd) Upthrust does not depend on the shape of the vessel in which the liquid is filled
Answer» A student took solid bodies of different shapes, sizes and materials and noted down the apparent loss in weight on partially or fully immersing the bodies in different liquids. Based on the observations, he wrote the following conclusions. Which statement is incorrect and why? a) Upthrust depends on the volume of the body immersed and density of the liquid b) Upthrust increases as the body goes deeper inside the liquid c) Upthrust depends on the acceleration due to gravity and density of the liquid d) Upthrust does not depend on the shape of the vessel in which the liquid is filled

Discussion

1764.	ntTwo small magnets ,each of 10 Ampere - sq.metre are placed on end on position 0.1 m apart from their centres . What is the force acting between them ?n
Answer» ntTwo small magnets ,each of 10 Ampere - sq.metre are placed on end on position 0.1 m apart from their centres . What is the force acting between them ?n

Discussion

1765.	Explain by an activity that during a free fall heavier and lighter objects accelerate at the same rate
Answer» Explain by an activity that during a free fall heavier and lighter objects accelerate at the same rate

Discussion

1766.	State Archimedes Principle?
Answer» State Archimedes Principle?

Discussion

1767.	A body is moving with uniform acceleration is having velocity 2ms and 8 ms at t=1sec and t=4sec then average velocity of particle in time interval t=1 to t=4 sec is
Answer» A body is moving with uniform acceleration is having velocity 2ms and 8 ms at t=1sec and t=4sec then average velocity of particle in time interval t=1 to t=4 sec is

Discussion

1768.	A body of mass m has a momentum p. What is its kinetic energy?
Answer» A body of mass $m$ has a momentum $p$ . What is its kinetic energy?

Discussion

1769.	Area under velocity-time graph gives:
Answer» Area under velocity-time graph gives:

Discussion

1770.	In a communication system operating at wavelength 800 nm, only one percent of source frequency is available as signal bandwidth. The number of channels accomodated for transmitting TV signals of band width 6 MHz are(Take velocity of light c=3×108 m/s,h=6.6×10−34J-s)
Answer» In a communication system operating at wavelength $800 nm$ , only one percent of source frequency is available as signal bandwidth. The number of channels accomodated for transmitting $TV$ signals of band width $6 MHz$ are (Take velocity of light $c = 3 \times 10^{8} m/s, h = 6.6 \times 10^{- 34} J-s$ )

Discussion

1771.	87. calculate the electric field intensity at point P :
Answer» 87. calculate the electric field intensity at point P :

Discussion

1772.	94. For a particle moving on straight line, beginning at rest at t=0 ,acceleration increases linearly with time.At certain instant t=t,speed of the particle is 6m/s. Average speed of the particle between t=0 and t=t is
Answer» 94. For a particle moving on straight line, beginning at rest at t=0 ,acceleration increases linearly with time.At certain instant t=t,speed of the particle is 6m/s. Average speed of the particle between t=0 and t=t is

Discussion

1773.	18. A force of 10 N is required to move a conducting loop through a non-uniform magnetic field at 2 ms1. Therate of production of electrical energy (in watt) in loop is(1) 5(2) 20(3) 10(4) Zero
Answer» 18. A force of 10 N is required to move a conducting loop through a non-uniform magnetic field at 2 ms1. Therate of production of electrical energy (in watt) in loop is(1) 5(2) 20(3) 10(4) Zero

Discussion

1774.	A person rubbed two glass rods using a silk cloth. When they are placed together, they start to move away from each other. What could be the reason?
Answer» A person rubbed two glass rods using a silk cloth. When they are placed together, they start to move away from each other. What could be the reason?

Discussion

1775.	Give three examples of transformation of energy to show energy provides different forms of energy
Answer» Give three examples of transformation of energy to show energy provides different forms of energy

Discussion

1776.	When a light of wavelength ′λ′ falls on the surface of a metal with threshold wavelength ′λ′0, an electron of mass m2 is emitted. The de Broglie wavelength of emitted electron is:
Answer» When a light of wavelength $^{'} λ^{'}$ falls on the surface of a metal with threshold wavelength $^{'} λ_{0}^{'}$ , an electron of mass $\frac{m}{2}$ is emitted. The de Broglie wavelength of emitted electron is:

Discussion

1777.	98.The length of half wave dipole antenna at 30 MHz is A. 10 m B. 50 m C. 5 m D. 100 m
Answer» 98.The length of half wave dipole antenna at 30 MHz is A. 10 m B. 50 m C. 5 m D. 100 m

Discussion

1778.	For the cycle shown below, the back work ratio is given as
Answer» For the cycle shown below, the back work ratio is given as

Discussion

1779.	On heating water its temperature becomes from (20.0±0.2)℃ to (25.0±0.3)℃. The maximum possible error in increasing temperature of water will be: A)2%B)10%C)(10/9)%D)(2/9)%
Answer» On heating water its temperature becomes from (20.0±0.2)℃ to (25.0±0.3)℃. The maximum possible error in increasing temperature of water will be: A)2% B)10% C)(10/9)% D)(2/9)%

Discussion

1780.	The image obtained by a mirror is erect and of the same size as that of the object. What type of mirror has been used?
Answer» The image obtained by a mirror is erect and of the same size as that of the object. What type of mirror has been used?

Discussion

1781.	Derive the relationship between a newton and a dyne.
Answer» Derive the relationship between a newton and a dyne.

Discussion

1782.	Give Reasons Even though stone attracts earth towards itself but earth does not move
Answer» Give Reasons Even though stone attracts earth towards itself but earth does not move

1782.

Give Reasons Even though stone attracts earth towards itself but earth does not move

Answer»

Give Reasons

Even though stone attracts earth towards itself but earth does not move

Discussion

1783.	Binding energy per nucleon vs mass number curve for nuclei is shown in the figure. W, X, Y and Z are four nuclei as indicated on the curve. The process that would release energy is–
Answer» Binding energy per nucleon vs mass number curve for nuclei is shown in the figure. W, X, Y and Z are four nuclei as indicated on the curve. The process that would release energy is–

Discussion

1784.	When we think of heat, we always think of the temperature changing. But is this always the case? This is just one 'type' of heat called 'sensible heat'. The heat could also be utilized in changing phase, from liquid to vapour, say. This is called latent heat. Now, air conditioners also remove both of these. Armed with all this info, can you crack this one; which of the following is eating up most your electricity bill while running the AC during a humid monsoon day in Hawaii?
Answer» When we think of heat, we always think of the temperature changing. But is this always the case? This is just one 'type' of heat called 'sensible heat'. The heat could also be utilized in changing phase, from liquid to vapour, say. This is called latent heat. Now, air conditioners also remove both of these. Armed with all this info, can you crack this one; which of the following is eating up most your electricity bill while running the AC during a humid monsoon day in Hawaii?

1784.

When we think of heat, we always think of the temperature changing. But is this always the case? This is just one 'type' of heat called 'sensible heat'. The heat could also be utilized in changing phase, from liquid to vapour, say. This is called latent heat. Now, air conditioners also remove both of these. Armed with all this info, can you crack this one; which of the following is eating up most your electricity bill while running the AC during a humid monsoon day in Hawaii?

Answer»

When we think of heat, we always think of the temperature changing. But is this always the case? This is just one 'type' of heat called 'sensible heat'. The heat could also be utilized in changing phase, from liquid to vapour, say. This is called latent heat.

Now, air conditioners also remove both of these. Armed with all this info, can you crack this one; which of the following is eating up most your electricity bill while running the AC during a humid monsoon day in Hawaii?

Discussion

1785.	A man standing on a spring balance inside a stationary lift measures 60 kg. The weight of that person if the lift descends with a uniform downward acceleration of 1.8 m/s2 will be _____N.[g=10 m/s2]
Answer» A man standing on a spring balance inside a stationary lift measures $60 kg$ . The weight of that person if the lift descends with a uniform downward acceleration of $1.8 {m/s}^{2}$ will be _____ $N$ . $[g = 10 {m/s}^{2}]$

Discussion

1786.	A shell of mass 20kg at rest explodes into two fragments whose masses are in the ratio 2:3 . The smaller fragment moves with a velocity of 6m/s . The kinetic energy of large fragment is
Answer» A shell of mass 20kg at rest explodes into two fragments whose masses are in the ratio 2:3 . The smaller fragment moves with a velocity of 6m/s . The kinetic energy of large fragment is

Discussion

1787.	The SI unit of universal gravitational constant is
Answer» The SI unit of universal gravitational constant is

Discussion

1788.	for formation of an echo why is it necessary for the wavelength of sound to be less than the height of the reflecting body
Answer» for formation of an echo why is it necessary for the wavelength of sound to be less than the height of the reflecting body

Discussion

1789.	A train 100m long is to cross a river bridge of lenght 800m . What time will take to cross the bridge .
Answer» A train 100m long is to cross a river bridge of lenght 800m . What time will take to cross the bridge .

Discussion

1790.	State four properties of magnetic field lines.
Answer» State four properties of magnetic field lines.

Discussion

1791.	8.A person walk up a stationary escalator in time t1s.If he is standing on moving escalator then it carries him up in t2s.If the length of escalator is l then time taken,if man move down the moving escalator is
Answer» 8.A person walk up a stationary escalator in time t1s.If he is standing on moving escalator then it carries him up in t2s.If the length of escalator is l then time taken,if man move down the moving escalator is

Discussion

1792.	When a mass M experiences a velocity change of v in a time of t, it experiences a force of F. Assuming the same velocity change of v, the force experienced by a mass of (M2 in a time of 4t is ____.
Answer» When a mass M experiences a velocity change of v in a time of t, it experiences a force of F. Assuming the same velocity change of v, the force experienced by a mass of ( $\frac{M}{2}$ in a time of 4t is ____.

Discussion

1793.	The seven bright stars of the constellation "The Big Dipper" was compared with _________.
Answer» The seven bright stars of the constellation "The Big Dipper" was compared with _________.

Discussion

1794.	A thin rod of length L and mass M is bent at its mid-point into two halves so that the angle between them is 90^° . The moment of inertia of the bent rod about an axis passing through the bending point and perpendicular to the planedefined by the two halves of the rod is
Answer» A thin rod of length L and mass M is bent at its mid-point into two halves so that the angle between them is 90^° . The moment of inertia of the bent rod about an axis passing through the bending point and perpendicular to the planedefined by the two halves of the rod is

Discussion

1795.	A ray of light is incident on the surface of a glass plate of refractive index 1.732 at the polarizing angle. The angle of refraction is,
Answer» A ray of light is incident on the surface of a glass plate of refractive index $1.732$ at the polarizing angle. The angle of refraction is,

Discussion

1796.	The resis†an ce of platinum resis†an ce thermometer is found to be 13.658 ohm at triple point of water.When dipped in bath,its resis†an ce is found to be 25.000 .the temperatureof bath is 1)300K 2)500K 3)200K 4)100
Answer» The resis†an ce of platinum resis†an ce thermometer is found to be 13.658 ohm at triple point of water.When dipped in bath,its resis†an ce is found to be 25.000 .the temperatureof bath is 1)300K 2)500K 3)200K 4)100

Discussion

1797.	The resistance of the coil of a tangent galvanometer is 60 Ω. It is connected to a battery of negligible internal resistance. The deflection is found to be 60∘. Now a shunt resistance of 30 Ω is connected across the coil of the tangent galvanometer. The deflection (in degree) produced will be
Answer» The resistance of the coil of a tangent galvanometer is $60 Ω$ . It is connected to a battery of negligible internal resistance. The deflection is found to be $60^{\circ}$ . Now a shunt resistance of $30 Ω$ is connected across the coil of the tangent galvanometer. The deflection $(in degree)$ produced will be

Discussion

1798.	A body with an initial velocity of 3ms−1 moves with an acceleration of 2ms−2 then the distance travelled in the fourth second is what?
Answer» A body with an initial velocity of $3 m s^{- 1}$ moves with an acceleration of $2 m s^{- 2}$ then the distance travelled in the fourth second is what?

Discussion

1799.	As you told me in the Last doubt that the earphone has to simply travel the air into your ears but how can it be possible in the space there is no air ? But I heard that the earphones work in space is that true or not?
Answer» As you told me in the Last doubt that the earphone has to simply travel the air into your ears but how can it be possible in the space there is no air ? But I heard that the earphones work in space is that true or not?

Discussion

1800.	What is a lander?
Answer» What is a lander?

Discussion

Explore topic-wise InterviewSolutions in .

A wire carrying current i is lying on a smooth imclined fixed wedge of angle of inclinationθ, magnetic feild is normal to the plane. find magnetic feild require to keep wire under equilibrium take mass of wire as m ignore earths magnetic feild.

Question 30If on increasing a,b decreases in such a manner that___remains ___and positive, then a and b are said to vary inversely with each other.

Calculate the amount of work done required in moving 5×1020 electrons across two points of a wire with a potential difference of 8 V.

If c is the speed of light in vacuum and v is the speed of light in the given medium, the absolute refractive index(n) of a medium is given as .

From the graph between current I and voltage V shown in figure, identify the portion corresponding to negative resistance.

State whether thrust is a scalar or vector ?

Two rings having the same radius R and mass M are placed such that their centres are at a common point and their planes are perpendicular to each other.Find the moment of inertia of the system about an axis passing through the center and perpendicular to the plane of one of the rings?

61.a man walks along a circular path of radius r from point A to B as shown in the figure. The displacement traversed by the man will be a.2R b. Sq. root of 3 c.Sq. root of 2 d.R

A particle moves in straight line with velocity 6 m/s and 3 m/s for time intervals which are in the ratio 1:2. Find average velocity of the particle.

How many orbits of multielectron atom or ion can have `2>n+l>4?

Question 7 A ball is gently dropped from a height of 20 m. If its velocity increases uniformly at the rate of 10 ms−2, with what velocity will it strike the ground? After what time will it strike the ground?

ntTwo small magnets ,each of 10 Ampere - sq.metre are placed on end on position 0.1 m apart from their centres . What is the force acting between them ?n

Explain by an activity that during a free fall heavier and lighter objects accelerate at the same rate

State Archimedes Principle?

A body is moving with uniform acceleration is having velocity 2ms and 8 ms at t=1sec and t=4sec then average velocity of particle in time interval t=1 to t=4 sec is

A body of mass m has a momentum p. What is its kinetic energy?

Area under velocity-time graph gives:

In a communication system operating at wavelength 800 nm, only one percent of source frequency is available as signal bandwidth. The number of channels accomodated for transmitting TV signals of band width 6 MHz are(Take velocity of light c=3×108 m/s,h=6.6×10−34J-s)

87. calculate the electric field intensity at point P :

94. For a particle moving on straight line, beginning at rest at t=0 ,acceleration increases linearly with time.At certain instant t=t,speed of the particle is 6m/s. Average speed of the particle between t=0 and t=t is

18. A force of 10 N is required to move a conducting loop through a non-uniform magnetic field at 2 ms1. Therate of production of electrical energy (in watt) in loop is(1) 5(2) 20(3) 10(4) Zero

A person rubbed two glass rods using a silk cloth. When they are placed together, they start to move away from each other. What could be the reason?

Give three examples of transformation of energy to show energy provides different forms of energy

When a light of wavelength ′λ′ falls on the surface of a metal with threshold wavelength ′λ′0, an electron of mass m2 is emitted. The de Broglie wavelength of emitted electron is:

98.The length of half wave dipole antenna at 30 MHz is A. 10 m B. 50 m C. 5 m D. 100 m

For the cycle shown below, the back work ratio is given as

On heating water its temperature becomes from (20.0±0.2)℃ to (25.0±0.3)℃. The maximum possible error in increasing temperature of water will be: A)2%B)10%C)(10/9)%D)(2/9)%

The image obtained by a mirror is erect and of the same size as that of the object. What type of mirror has been used?

Derive the relationship between a newton and a dyne.

Give Reasons Even though stone attracts earth towards itself but earth does not move

Binding energy per nucleon vs mass number curve for nuclei is shown in the figure. W, X, Y and Z are four nuclei as indicated on the curve. The process that would release energy is–

A man standing on a spring balance inside a stationary lift measures 60 kg. The weight of that person if the lift descends with a uniform downward acceleration of 1.8 m/s2 will be _____N.[g=10 m/s2]

A shell of mass 20kg at rest explodes into two fragments whose masses are in the ratio 2:3 . The smaller fragment moves with a velocity of 6m/s . The kinetic energy of large fragment is

The SI unit of universal gravitational constant is

for formation of an echo why is it necessary for the wavelength of sound to be less than the height of the reflecting body

A train 100m long is to cross a river bridge of lenght 800m . What time will take to cross the bridge .

State four properties of magnetic field lines.

8.A person walk up a stationary escalator in time t1s.If he is standing on moving escalator then it carries him up in t2s.If the length of escalator is l then time taken,if man move down the moving escalator is

When a mass M experiences a velocity change of v in a time of t, it experiences a force of F. Assuming the same velocity change of v, the force experienced by a mass of (M2 in a time of 4t is ____.

The seven bright stars of the constellation "The Big Dipper" was compared with _________.

A thin rod of length L and mass M is bent at its mid-point into two halves so that the angle between them is 90^° . The moment of inertia of the bent rod about an axis passing through the bending point and perpendicular to the planedefined by the two halves of the rod is

A ray of light is incident on the surface of a glass plate of refractive index 1.732 at the polarizing angle. The angle of refraction is,

The resis†an ce of platinum resis†an ce thermometer is found to be 13.658 ohm at triple point of water.When dipped in bath,its resis†an ce is found to be 25.000 .the temperatureof bath is 1)300K 2)500K 3)200K 4)100

The resistance of the coil of a tangent galvanometer is 60 Ω. It is connected to a battery of negligible internal resistance. The deflection is found to be 60∘. Now a shunt resistance of 30 Ω is connected across the coil of the tangent galvanometer. The deflection (in degree) produced will be

A body with an initial velocity of 3ms−1 moves with an acceleration of 2ms−2 then the distance travelled in the fourth second is what?

As you told me in the Last doubt that the earphone has to simply travel the air into your ears but how can it be possible in the space there is no air ? But I heard that the earphones work in space is that true or not?

What is a lander?

Question 30If on increasing a,b decreases in such a manner that_remains _and positive, then a and b are said to vary inversely with each other.