13232 + Interview Questions in Physics Page 14 InterviewSolution

651.	A rod of length L and uniform mass m, is pivotedat one end and is rotated with a uniform angularvelocity in a horizontal plane. A small block ofsame mass is attached to the free end of the rod.The value of tension force developed in therod at a distance L/3 from the pivot end i
Answer» A rod of length L and uniform mass m, is pivoted at one end and is rotated with a uniform angular velocity in a horizontal plane. A small block of same mass is attached to the free end of the rod. The value of tension force developed in the rod at a distance L/3 from the pivot end i

Discussion

652.	Which of the quantity speed or velocity gives the direction of motion of body ?
Answer» Which of the quantity speed or velocity gives the direction of motion of body ?

Discussion

653.	Question 3The numerical ratio of displacement to distance for a moving object is(a) always less than 1(b) always equal to 1(c) always more than 1(d) equal to or less than 1
Answer» Question 3 The numerical ratio of displacement to distance for a moving object is (a) always less than 1 (b) always equal to 1 (c) always more than 1 (d) equal to or less than 1

Discussion

654.	What will be the change in the wavelength of a sound wave in the air if its frequency is doubled?
Answer» What will be the change in the wavelength of a sound wave in the air if its frequency is doubled?

Discussion

655.	Two identical small bodies each of mass m and charge q are suspended from two strings each of length l from a fixed point. This whole system is taken into an orbiting artificial satellite. Find the tension in strings
Answer» Two identical small bodies each of mass m and charge q are suspended from two strings each of length l from a fixed point. This whole system is taken into an orbiting artificial satellite. Find the tension in strings

Discussion

656.	Question 55(v)Study the graph given below of a person who started from his home and returned at the end of the day. Answer the questions that follow.Calculate the distance covered by him in the first 8h of his journey.
Answer» Question 55(v) Study the graph given below of a person who started from his home and returned at the end of the day. Answer the questions that follow. Calculate the distance covered by him in the first 8h of his journey.

Discussion

657.	We know that acceleration is =velocity/time. Now if velocity is zero, then according to the above formula acceleration should also be zero. But it isn't so, why?
Answer» We know that acceleration is =velocity/time. Now if velocity is zero, then according to the above formula acceleration should also be zero. But it isn't so, why?

Discussion

658.	A rope of mass m and length l is kept on a smooth horizontal surface.A cons†an t horizontal force F acts on one of its ends and a pulse is generated at the free end. The ratio of its velocity at the end where force is applied and at the mid point of the rope is equal is
Answer» A rope of mass m and length l is kept on a smooth horizontal surface.A cons†an t horizontal force F acts on one of its ends and a pulse is generated at the free end. The ratio of its velocity at the end where force is applied and at the mid point of the rope is equal is

Discussion

659.	explain falsification and verification
Answer» explain falsification and verification

Discussion

660.	7. Oscillator is moving according to the law, x=Xosin ω t because of a driving force F=Focosω acting on it. What is the dampingcoefficient γ of the oscillator? Mass of theoscillator is m. The resistive force is dependent on velocity v as F=-gamma.m.v a.F0/xoω b.F0/2x0ω c.F0/mx0ω d.F0/2mx0ω
Answer» 7. Oscillator is moving according to the law, x=Xosin ω t because of a driving force F=Focosω acting on it. What is the dampingcoefficient γ of the oscillator? Mass of theoscillator is m. The resistive force is dependent on velocity v as F=-gamma.m.v a.F0/xoω b.F0/2x0ω c.F0/mx0ω d.F0/2mx0ω

Discussion

661.	18.The speed of sound ina gas depend of pressure (p) and density d of that gas obtained the formula for speed sound
Answer» 18.The speed of sound ina gas depend of pressure (p) and density d of that gas obtained the formula for speed sound

Discussion

662.	How will the force of gravitation change acting between them is made 5 times and making the mass of both objects double?
Answer» How will the force of gravitation change acting between them is made 5 times and making the mass of both objects double?

Discussion

663.	Calculate the force of gravitation between two object of masses 80 kg and 120 kg kept at a distance of 10 m of each other.
Answer» Calculate the force of gravitation between two object of masses 80 kg and 120 kg kept at a distance of 10 m of each other.

Discussion

664.	With what speed must an object be thrown vertically upwards to reach a height of 91.5 m? (Take g=9.8 ms−2)
Answer» With what speed must an object be thrown vertically upwards to reach a height of 91.5 m? (Take $g = 9.8 m s^{- 2}$ )

Discussion

665.	An electric field has the components Ex=5x , Ey=-3y , Ez=4z. calculate the electri flux throigh the sides of a unit cube , whose corners are (x,y z) =(0,0,0) , (1,0,0), (1,1,0),(0,1,0),(0,0,1),(1,0,1),(1,1,1), and (0,1,1). all fields are measured in N/C ,all dis†an ces in met
Answer» An electric field has the components Ex=5x , Ey=-3y , Ez=4z. calculate the electri flux throigh the sides of a unit cube , whose corners are (x,y z) =(0,0,0) , (1,0,0), (1,1,0),(0,1,0),(0,0,1),(1,0,1),(1,1,1), and (0,1,1). all fields are measured in N/C ,all dis†an ces in met

Discussion

666.	26.two small dipole are placed in space as shown dipole p1 is fixed and p2 is allowed to rotate about its hinged centre find the direction of rotation of p2 in the following cases
Answer» 26.two small dipole are placed in space as shown dipole p1 is fixed and p2 is allowed to rotate about its hinged centre find the direction of rotation of p2 in the following cases

Discussion

667.	How to find the image distance?
Answer» How to find the image distance?

Discussion

668.	Which of the following is true about lenses?
Answer» Which of the following is true about lenses?

Discussion

669.	Two blocks of mass 2kg and 4kg are accelerated with same acceleration by a force 10N as shown in figure on a smooth horizontal surface.Then the spring force between the two blocks will be?
Answer» Two blocks of mass 2kg and 4kg are accelerated with same acceleration by a force 10N as shown in figure on a smooth horizontal surface.Then the spring force between the two blocks will be?

Discussion

670.	A boy on a cliff 49 m high, drops a stone, one second later, he throws another stone vertically downwards. The two stones hit the ground at the same time. What was the velocity with which the second stone was thrown?
Answer» A boy on a cliff $49 m$ high, drops a stone, one second later, he throws another stone vertically downwards. The two stones hit the ground at the same time. What was the velocity with which the second stone was thrown?

Discussion

671.	93. In a resonance tube with tuning fork of frequency 512 Hertz first resonance occurs at water level equal to 30.3 cm and second resonance occurs at 63.7 Cm .the maximum possible error in the speed of sound is 1)51.2. 2)102.4. 3)204.8. 4)153.6cm/s
Answer» 93. In a resonance tube with tuning fork of frequency 512 Hertz first resonance occurs at water level equal to 30.3 cm and second resonance occurs at 63.7 Cm .the maximum possible error in the speed of sound is 1)51.2. 2)102.4. 3)204.8. 4)153.6cm/s

Discussion

672.	Explain nuclear fission and binding energy
Answer» Explain nuclear fission and binding energy

Discussion

673.	A cube of wood supporting 200g mass just floats in water. When the mass is removed,the cube rises by 1cm, the linear dimension of cube is
Answer» A cube of wood supporting 200g mass just floats in water. When the mass is removed,the cube rises by 1cm, the linear dimension of cube is

Discussion

674.	Light as we observe it is a chain of photoelectric particles or atlaest assumed to be so does this imply that that light is not a wave when scientists do expiraments they observe photons doing weird things such as passing right through solid materials and being capable of existing in two places at the same time are these phenomenon explainable
Answer» Light as we observe it is a chain of photoelectric particles or atlaest assumed to be so does this imply that that light is not a wave when scientists do expiraments they observe photons doing weird things such as passing right through solid materials and being capable of existing in two places at the same time are these phenomenon explainable

Discussion

675.	A tuning fork produces a wave of wavelength 100cm in air at 27^° C. The wavelength of the waveproduced by the fork in air at 127eC will be nearly(1) 80 cnm(2) 85 cm(3) 125 cm(4) 115 cm
Answer» A tuning fork produces a wave of wavelength 100cm in air at 27^° C. The wavelength of the waveproduced by the fork in air at 127eC will be nearly(1) 80 cnm(2) 85 cm(3) 125 cm(4) 115 cm

Discussion

676.	'The distance of a star from the earth is 8.33 light minutes.' What do you mean by this statement ? Express the distance in metre.
Answer» 'The distance of a star from the earth is 8.33 light minutes.' What do you mean by this statement ? Express the distance in metre.

Discussion

677.	A plane mirror is placed 25 cm away from a concave spherical mirror perpendicularly on the principal axis (bottom of the plane mirror touches principal axis and the top is towards the vertical up) of the concave mirror. What should be the distance (in cm) in front of concave mirror, where we place a candle if its images formed after 1st reflection from plane mirror and then from concave mirror are at the same distances from the candle? The radius of the concave mirror is 40 cm.
Answer» A plane mirror is placed 25 cm away from a concave spherical mirror perpendicularly on the principal axis (bottom of the plane mirror touches principal axis and the top is towards the vertical up) of the concave mirror. What should be the distance (in cm) in front of concave mirror, where we place a candle if its images formed after 1st reflection from plane mirror and then from concave mirror are at the same distances from the candle? The radius of the concave mirror is 40 cm.

Discussion

678.	if the unit of force is 1 Newton and the unit of work done is 10 joules and the unit of time is one second the unit of mass is
Answer» if the unit of force is 1 Newton and the unit of work done is 10 joules and the unit of time is one second the unit of mass is

Discussion

679.	How many types of forces ? Which are they?
Answer» How many types of forces ? Which are they?

Discussion

680.	Identify the correct position of the image of the Sun formed by the concave mirror.
Answer» Identify the correct position of the image of the Sun formed by the concave mirror.

Discussion

681.	what is the difference between absolute and relative motion?
Answer» what is the difference between absolute and relative motion?

Discussion

682.	A satellite is revolving in a circular orbit at a height 'h' from the earth's surface (radius of earth R; h<<R). The minimum increase in its orbital velocity required, so that the satellite could escape from the earth's gravitational field, is close to (Neglect the effect of atmosphere.)
Answer» A satellite is revolving in a circular orbit at a height ' $h$ ' from the earth's surface (radius of earth $R$ ; $h << R$ ). The minimum increase in its orbital velocity required, so that the satellite could escape from the earth's gravitational field, is close to (Neglect the effect of atmosphere.)

Discussion

683.	Describe in steps, how would you use a vernier callipers to measure the length of a small rod ?
Answer» Describe in steps, how would you use a vernier callipers to measure the length of a small rod ?

Discussion

684.	76. The electric field components in the figure below are Ex=800X2N/C,Ey=Ez=0
Answer» 76. The electric field components in the figure below are Ex=800X2N/C,Ey=Ez=0

Discussion

685.	When a drum is beaten, a sound is heard due to:
Answer» When a drum is beaten, a sound is heard due to:

Discussion

686.	if average life of a person is taken as 100 seconds , age of universe on this scale is of or
Answer» if average life of a person is taken as 100 seconds , age of universe on this scale is of or

Discussion

687.	How is it possible to detect the filling of a bucket under a water tap by hearing the sound while standing at a distance?
Answer» How is it possible to detect the filling of a bucket under a water tap by hearing the sound while standing at a distance?

Discussion

688.	Question 24How can solar energy be harnessed? Mention any two limitations in using solar energy. How can we overcome these limitations?
Answer» Question 24 How can solar energy be harnessed? Mention any two limitations in using solar energy. How can we overcome these limitations?

Discussion

689.	Molar heat capacity of water in equilibrium with ice at cons†an t pressure i
Answer» Molar heat capacity of water in equilibrium with ice at cons†an t pressure i

Discussion

690.	Question 2 Why is the weight of an object on the moon 16th its weight on the earth?
Answer» Question 2 Why is the weight of an object on the moon $\frac{1}{6} t h$ its weight on the earth?

Discussion

691.	A stone is dropped from the top of a tower. If it travels 34.3m in the last second before it reaches the ground, find the height of the tower? Take g=10m/s2
Answer» A stone is dropped from the top of a tower. If it travels 34.3m in the last second before it reaches the ground, find the height of the tower? Take g=10m/ $s^{2}$

Discussion

692.	a body is thrown vertically upward from apoint a 125 m above tge ground it goes upto a maximum height of 250 m above the ground and passes through a on its downward journey the velocity of the body when it is at a height of 70m above the ground i
Answer» a body is thrown vertically upward from apoint a 125 m above tge ground it goes upto a maximum height of 250 m above the ground and passes through a on its downward journey the velocity of the body when it is at a height of 70m above the ground i

Discussion

693.	Question 2Which of the following constitute a food-chain?1. Grass, wheat and mango2. Grass, goat and human3. Goat, cow and elephant4. Grass, fish and goat
Answer» Question 2 Which of the following constitute a food-chain? 1. Grass, wheat and mango 2. Grass, goat and human 3. Goat, cow and elephant 4. Grass, fish and goat

Discussion

694.	Explain atmospheric pressure in terms of bar?
Answer» Explain atmospheric pressure in terms of bar?

Discussion

695.	70.A stone is projected vertically up from ground with a velocity 40 m/s. The interval of time between the two instants at which the stone is at height of 60 m above the ground is (g=10 m/s²)
Answer» 70.A stone is projected vertically up from ground with a velocity 40 m/s. The interval of time between the two instants at which the stone is at height of 60 m above the ground is (g=10 m/s²)

Discussion

696.	The power of a lamp is 100W. Find the energy consumed by it in 1 minute?
Answer» The power of a lamp is 100W. Find the energy consumed by it in 1 minute?

Discussion

697.	Sam hits a baseball of mass 200 g from his bat and scores a homerun. The speed of the ball changed from 10 ms−1 to 20 ms−1 after hitting in just 0.5 seconds. Calculate the Power delivered by the bat.
Answer» Sam hits a baseball of mass 200 g from his bat and scores a homerun. The speed of the ball changed from 10 ms $^{- 1}$ to 20 ms $^{- 1}$ after hitting in just 0.5 seconds. Calculate the Power delivered by the bat.

Discussion

698.	How will you test whether a given rod is made of iron or copper ?
Answer» How will you test whether a given rod is made of iron or copper ?

Discussion

699.	If m, mn and mp are the masses of ZXA nucleus, neutron and proton respectively, then which of the following is correct?
Answer» If m, $m_{n}$ and $m_{p}$ are the masses of $_{Z} X^{A}$ nucleus, neutron and proton respectively, then which of the following is correct?

Discussion

700.	Give scientific reason. The copper wire used in an electromagnet is insulted. I want short answer in 11 To 12 lines.
Answer» Give scientific reason. The copper wire used in an electromagnet is insulted. I want short answer in 11 To 12 lines.

Discussion

Explore topic-wise InterviewSolutions in .

A rod of length L and uniform mass m, is pivotedat one end and is rotated with a uniform angularvelocity in a horizontal plane. A small block ofsame mass is attached to the free end of the rod.The value of tension force developed in therod at a distance L/3 from the pivot end i

Which of the quantity speed or velocity gives the direction of motion of body ?

Question 3The numerical ratio of displacement to distance for a moving object is(a) always less than 1(b) always equal to 1(c) always more than 1(d) equal to or less than 1

What will be the change in the wavelength of a sound wave in the air if its frequency is doubled?

Two identical small bodies each of mass m and charge q are suspended from two strings each of length l from a fixed point. This whole system is taken into an orbiting artificial satellite. Find the tension in strings

Question 55(v)Study the graph given below of a person who started from his home and returned at the end of the day. Answer the questions that follow.Calculate the distance covered by him in the first 8h of his journey.

We know that acceleration is =velocity/time. Now if velocity is zero, then according to the above formula acceleration should also be zero. But it isn't so, why?

A rope of mass m and length l is kept on a smooth horizontal surface.A cons†an t horizontal force F acts on one of its ends and a pulse is generated at the free end. The ratio of its velocity at the end where force is applied and at the mid point of the rope is equal is

explain falsification and verification

7. Oscillator is moving according to the law, x=Xosin ω t because of a driving force F=Focosω acting on it. What is the dampingcoefficient γ of the oscillator? Mass of theoscillator is m. The resistive force is dependent on velocity v as F=-gamma.m.v a.F0/xoω b.F0/2x0ω c.F0/mx0ω d.F0/2mx0ω

18.The speed of sound ina gas depend of pressure (p) and density d of that gas obtained the formula for speed sound

How will the force of gravitation change acting between them is made 5 times and making the mass of both objects double?

Calculate the force of gravitation between two object of masses 80 kg and 120 kg kept at a distance of 10 m of each other.

With what speed must an object be thrown vertically upwards to reach a height of 91.5 m? (Take g=9.8 ms−2)

An electric field has the components Ex=5x , Ey=-3y , Ez=4z. calculate the electri flux throigh the sides of a unit cube , whose corners are (x,y z) =(0,0,0) , (1,0,0), (1,1,0),(0,1,0),(0,0,1),(1,0,1),(1,1,1), and (0,1,1). all fields are measured in N/C ,all dis†an ces in met

26.two small dipole are placed in space as shown dipole p1 is fixed and p2 is allowed to rotate about its hinged centre find the direction of rotation of p2 in the following cases

How to find the image distance?

Which of the following is true about lenses?

Two blocks of mass 2kg and 4kg are accelerated with same acceleration by a force 10N as shown in figure on a smooth horizontal surface.Then the spring force between the two blocks will be?

A boy on a cliff 49 m high, drops a stone, one second later, he throws another stone vertically downwards. The two stones hit the ground at the same time. What was the velocity with which the second stone was thrown?

93. In a resonance tube with tuning fork of frequency 512 Hertz first resonance occurs at water level equal to 30.3 cm and second resonance occurs at 63.7 Cm .the maximum possible error in the speed of sound is 1)51.2. 2)102.4. 3)204.8. 4)153.6cm/s

Explain nuclear fission and binding energy

A cube of wood supporting 200g mass just floats in water. When the mass is removed,the cube rises by 1cm, the linear dimension of cube is

A tuning fork produces a wave of wavelength 100cm in air at 27^° C. The wavelength of the waveproduced by the fork in air at 127eC will be nearly(1) 80 cnm(2) 85 cm(3) 125 cm(4) 115 cm

'The distance of a star from the earth is 8.33 light minutes.' What do you mean by this statement ? Express the distance in metre.

if the unit of force is 1 Newton and the unit of work done is 10 joules and the unit of time is one second the unit of mass is

How many types of forces ? Which are they?

Identify the correct position of the image of the Sun formed by the concave mirror.

what is the difference between absolute and relative motion?

A satellite is revolving in a circular orbit at a height 'h' from the earth's surface (radius of earth R; h&lt;&lt;R). The minimum increase in its orbital velocity required, so that the satellite could escape from the earth's gravitational field, is close to (Neglect the effect of atmosphere.)

Describe in steps, how would you use a vernier callipers to measure the length of a small rod ?

76. The electric field components in the figure below are Ex=800X2N/C,Ey=Ez=0

When a drum is beaten, a sound is heard due to:

if average life of a person is taken as 100 seconds , age of universe on this scale is of or

How is it possible to detect the filling of a bucket under a water tap by hearing the sound while standing at a distance?

Question 24How can solar energy be harnessed? Mention any two limitations in using solar energy. How can we overcome these limitations?

Molar heat capacity of water in equilibrium with ice at cons†an t pressure i

Question 2 Why is the weight of an object on the moon 16th its weight on the earth?

A stone is dropped from the top of a tower. If it travels 34.3m in the last second before it reaches the ground, find the height of the tower? Take g=10m/s2

a body is thrown vertically upward from apoint a 125 m above tge ground it goes upto a maximum height of 250 m above the ground and passes through a on its downward journey the velocity of the body when it is at a height of 70m above the ground i

Question 2Which of the following constitute a food-chain?1. Grass, wheat and mango2. Grass, goat and human3. Goat, cow and elephant4. Grass, fish and goat

Explain atmospheric pressure in terms of bar?

70.A stone is projected vertically up from ground with a velocity 40 m/s. The interval of time between the two instants at which the stone is at height of 60 m above the ground is (g=10 m/s²)

The power of a lamp is 100W. Find the energy consumed by it in 1 minute?

Sam hits a baseball of mass 200 g from his bat and scores a homerun. The speed of the ball changed from 10 ms−1 to 20 ms−1 after hitting in just 0.5 seconds. Calculate the Power delivered by the bat.

How will you test whether a given rod is made of iron or copper ?

If m, mn and mp are the masses of ZXA nucleus, neutron and proton respectively, then which of the following is correct?

Give scientific reason. The copper wire used in an electromagnet is insulted. I want short answer in 11 To 12 lines.

A satellite is revolving in a circular orbit at a height 'h' from the earth's surface (radius of earth R; h<<R). The minimum increase in its orbital velocity required, so that the satellite could escape from the earth's gravitational field, is close to (Neglect the effect of atmosphere.)