13232 + Interview Questions in Physics Page 255 InterviewSolution

12701.	Question 3 Calculate the wavelength of a sound wave whose frequency is 220 Hz and speed is 440 m/s in a given medium.
Answer» Question 3 Calculate the wavelength of a sound wave whose frequency is 220 Hz and speed is 440 m/s in a given medium.

Discussion

12702.	A ball falls vertically after being dropped. The ball falls a distance d metres in a time of t seconds. d is directly proportional to the square of t. The ball falls 20 metres in a time of 2 seconds. The time (in seconds) that the ball takes to fall 605 m is
Answer» A ball falls vertically after being dropped. The ball falls a distance d metres in a time of t seconds. d is directly proportional to the square of t. The ball falls 20 metres in a time of 2 seconds. The time (in seconds) that the ball takes to fall 605 m is

Discussion

12703.	Suppose that a boy skates at a rate of 2 ms−2. If the net force is tripled and the mass is halved, then what is the new acceleration of the skater?
Answer» Suppose that a boy skates at a rate of $2 m s^{- 2}$ . If the net force is tripled and the mass is halved, then what is the new acceleration of the skater?

Discussion

12704.	Two boys were playing with a ball on a level ground. One of the boys throws the ball on the third floor of the building which is at a height of 5 m and the other boy manages to throw on the fourth floor which is at a height of 7 m from the level ground. The ratio of the work done by both the boys is?
Answer» Two boys were playing with a ball on a level ground. One of the boys throws the ball on the third floor of the building which is at a height of $5 m$ and the other boy manages to throw on the fourth floor which is at a height of $7 m$ from the level ground. The ratio of the work done by both the boys is?

Discussion

12705.	A microscope has its main scale with 20 divisions in 1 cm and vernier scale with 25 divisions, the length of which is equal to the length of 24 divisions of main scale. The least count of microscope is : (a) 0.002 cm (b) 0.001 cm (c) 0.02 cm (d) 0.01 cm
Answer» A microscope has its main scale with 20 divisions in 1 cm and vernier scale with 25 divisions, the length of which is equal to the length of 24 divisions of main scale. The least count of microscope is : (a) 0.002 cm (b) 0.001 cm (c) 0.02 cm (d) 0.01 cm

12705.

A microscope has its main scale with 20 divisions in 1 cm and vernier scale with 25 divisions, the length of which is equal to the length of 24 divisions of main scale. The least count of microscope is : (a) 0.002 cm (b) 0.001 cm (c) 0.02 cm (d) 0.01 cm

Answer»

A microscope has its main scale with 20 divisions in 1 cm and vernier scale with 25 divisions, the length of which is equal to the length of 24 divisions of main scale. The least count of microscope is :

(a) 0.002 cm (b) 0.001 cm

(c) 0.02 cm (d) 0.01 cm

Discussion

12706.	The time periods of two simple pendulums at a place are in ratio 2 : 1. What will be the ratio of their length ?
Answer» The time periods of two simple pendulums at a place are in ratio 2 : 1. What will be the ratio of their length ?

Discussion

12707.	Give reason for the following - A boy is carrying a box on his head and standing ;is he doing any work? Give reason .
Answer» Give reason for the following - A boy is carrying a box on his head and standing ;is he doing any work? Give reason .

12707.

Give reason for the following - A boy is carrying a box on his head and standing ;is he doing any work? Give reason .

Answer»

Give reason for the following -

A boy is carrying a box on his head and standing ;is he doing any work? Give reason .

Discussion

12708.	The linear momentum of a ball of mass 50 g is 0.5 kg m s−1. Find its velocity.
Answer» The linear momentum of a ball of mass 50 g is 0.5 kg m $s^{- 1} .$ Find its velocity.

Discussion

12709.	In which medium, air or water, an echo is heard much sooner? Why ?
Answer» In which medium, air or water, an echo is heard much sooner? Why ?

Discussion

12710.	Show that the energy flow in an ecosystem is linear.
Answer» Show that the energy flow in an ecosystem is linear.

Discussion

12711.	A body with an initial velocity of 18kmh accelerates uniformly at the rate of 3cms2 over a distance of 200 m in t s. What will be its be its velocity at time t?
Answer» A body with an initial velocity of $18 \frac{k m}{h}$ accelerates uniformly at the rate of $3 \frac{c m}{s^{2}}$ over a distance of 200 m in $t$ s. What will be its be its velocity at time $t$ ?

Discussion

12712.	A light-ray behaves as ________.
Answer» A light-ray behaves as ________.

Discussion

12713.	Ratio of the magnitude of displacement and the distance is equal or less than 1.Explain.
Answer» Ratio of the magnitude of displacement and the distance is equal or less than 1.Explain.

Discussion

12714.	What is the value of 1 kg body on moon and what is its value?
Answer» What is the value of 1 kg body on moon and what is its value?

Discussion

12715.	Q. In the process of ultrasound cleaning, we take object which is to be clean and soak in the liquid, after that we produce ultrasound and the dirty particle viberates and it is removed. I want to know the name of that solution (with chemical formula) in which the object is soaked?
Answer» Q. In the process of ultrasound cleaning, we take object which is to be clean and soak in the liquid, after that we produce ultrasound and the dirty particle viberates and it is removed. I want to know the name of that solution (with chemical formula) in which the object is soaked?

Discussion

12716.	Sir, A body moving with a constant acceleration travels the distances 3m and 8m respectively in 1s and 2s. Calculate :(i) the initial velocity and (ii) the acceleration of the body. How to solve this?
Answer» Sir, A body moving with a constant acceleration travels the distances 3m and 8m respectively in 1s and 2s. Calculate :(i) the initial velocity and (ii) the acceleration of the body. How to solve this?

Discussion

12717.	The same amount of pressure is applied on two different objects with different surface areas. In this scenario which of the following statements is correct?
Answer» The same amount of pressure is applied on two different objects with different surface areas. In this scenario which of the following statements is correct?

Discussion

12718.	What happens if the ear drum was not present in ear?
Answer» What happens if the ear drum was not present in ear?

Discussion

12719.	A particle of mass 1 kg was sliding with a velocity of 10 m/s on a rough floor. It comes to rest after 5 s. The rate at which floor warms up is ___ W.
Answer» A particle of mass 1 kg was sliding with a velocity of 10 m/s on a rough floor. It comes to rest after 5 s. The rate at which floor warms up is ___ W.

Discussion

12720.	If the mass of a ball is 5kg on the Earth, then what would be its mass on Jupiter?
Answer» If the mass of a ball is $5 k g$ on the Earth, then what would be its mass on Jupiter?

Discussion

12721.	The potential difference applied to an X -ray tube is 5 k V and the current through it is 3.2 mA. Then the number of the electrons striking the target per second is
Answer» The potential difference applied to an X -ray tube is 5 k V and the current through it is 3.2 mA. Then the number of the electrons striking the target per second is

Discussion

12722.	A space craft flying in a straight course with a velocity of 75 m s−1 fires its rocket motors for 6.0 s.At the end of this time, its speed is 120 km s−1 in the same direction.Find:(i) the space craft's average acceleration while the motors were firing,(ii) the distance travelled by the space craft in the first 10 s after the rocket motors were started,the motors having been in action for only 6.0 s.
Answer» A space craft flying in a straight course with a velocity of 75 $m s^{- 1}$ fires its rocket motors for 6.0 s.At the end of this time, its speed is 120 $k m s^{- 1}$ in the same direction.Find:(i) the space craft's average acceleration while the motors were firing,(ii) the distance travelled by the space craft in the first 10 s after the rocket motors were started,the motors having been in action for only 6.0 s.

Discussion

12723.	Is it true that sun is not stationary and revolves or moves around the galaxy?
Answer» Is it true that sun is not stationary and revolves or moves around the galaxy?

Discussion

12724.	A box of mass 4.3kg is lifted diagonally from point A to point B as shown in the given figure. Given that the acceleration due to gravity is 10 ms−2, then the gravitational potential energy gained by the box will be ________.
Answer» A box of mass $4.3 k g$ is lifted diagonally from point A to point B as shown in the given figure. Given that the acceleration due to gravity is 10 $m s^{- 2}$ , then the gravitational potential energy gained by the box will be ________.

Discussion

12725.	Why do we need to go in same direction for uniform motion
Answer» Why do we need to go in same direction for uniform motion

Discussion

12726.	The value of one newton
Answer» The value of one newton

Discussion

12727.	how does current flows in an electrolyte
Answer» how does current flows in an electrolyte

Discussion

12728.	A child is moving on a skateboard at a speed of 3 ms−1. After a force acts on him, his speed becomes 5 ms−1. What is the work done by the external force, given the mass of the object is 20 kg?
Answer» A child is moving on a skateboard at a speed of $3 m s^{- 1}$ . After a force acts on him, his speed becomes $5 m s^{- 1}$ . What is the work done by the external force, given the mass of the object is $20 k g$ ?

Discussion

12729.	An object of weight 500 N is floating in a liquid. The magnitude of buoyant force acting on it is
Answer» An object of weight 500 N is floating in a liquid. The magnitude of buoyant force acting on it is

Discussion

12730.	During a negative beta decay, a neutron in the nucleus decays emitting an electron.
Answer» During a negative beta decay, a neutron in the nucleus decays emitting an electron.

Discussion

12731.	A bulb is connected to a cell. How is the resistance of circuit affected if another identical bulb is connected in series with the first bulb?
Answer» A bulb is connected to a cell. How is the resistance of circuit affected if another identical bulb is connected in series with the first bulb?

Discussion

12732.	What is the up thrust experienced by a balloon of volume 120m3 filled with hydrogen. The density of air = 1.140 kgm3 and density of hydrogen = 0.081kgm3 at room temperature. What is the maximum weight this balloon can lift?
Answer» What is the up thrust experienced by a balloon of volume 120 $m^{3}$ filled with hydrogen. The density of air = 1.140 $\frac{k g}{m^{3}}$ and density of hydrogen = 0.081 $\frac{k g}{m^{3}}$ at room temperature. What is the maximum weight this balloon can lift?

Discussion

12733.	A 500 kg cloth bag is pulled up a smooth plane 6m long to platform 4m above the ground. The work done is: (Take g = 10 ms-2)
Answer» A 500 kg cloth bag is pulled up a smooth plane 6m long to platform 4m above the ground. The work done is: (Take g = 10 ms^-2)

Discussion

12734.	The floor of the swimming pool looks shallower than what it really is. What phenomenon is responsible for it?
Answer» The floor of the swimming pool looks shallower than what it really is. What phenomenon is responsible for it?

Discussion

12735.	What is acceleration due to gravity? If we take a paper and duster and drop from some height, which will reach first?
Answer» What is acceleration due to gravity? If we take a paper and duster and drop from some height, which will reach first?

Discussion

12736.	'Induced magnetism is temporary'. Comment on this statement.
Answer» 'Induced magnetism is temporary'. Comment on this statement.

Discussion

12737.	What does the slope of velocity-time graph represent?
Answer» What does the slope of velocity-time graph represent?

Discussion

12738.	If the loudness of sound is to be increased 4 times then how many times should the amplitude be increased?
Answer» If the loudness of sound is to be increased 4 times then how many times should the amplitude be increased?

Discussion

12739.	Differences between mass of an object and its weight? ( minimum 6 points)
Answer» Differences between mass of an object and its weight? ( minimum 6 points)

Discussion

12740.	Accelerates uniformly from 18 km per hour to 36 kilometre per hour in 5 seconds. Calculate:- 1) the acceleration and 2) the distance covered by the car in that time
Answer» Accelerates uniformly from 18 km per hour to 36 kilometre per hour in 5 seconds. Calculate:- 1) the acceleration and 2) the distance covered by the car in that time

12740.

Accelerates uniformly from 18 km per hour to 36 kilometre per hour in 5 seconds. Calculate:- 1) the acceleration and 2) the distance covered by the car in that time

Answer»

Accelerates uniformly from 18 km per hour to 36 kilometre per hour in 5 seconds. Calculate:-

1) the acceleration and

2) the distance covered by the car in that time

Discussion

12741.	Why is speed not considered as a vector quantity?
Answer» Why is speed not considered as a vector quantity?

Discussion

12742.	Derivation of s=ut+1/2(gt2
Answer» Derivation of s=ut+1/2(gt²

Discussion

12743.	Question 163(i) Supply the missing information for each diagram.
Answer» Question 163(i) Supply the missing information for each diagram.

12743.

Question 163(i) Supply the missing information for each diagram.

Answer»

Question 163(i)

Supply the missing information for each diagram.

Discussion

12744.	Sound is also a transverse wave.In which state the sound travels in transverse wave ? Explain.
Answer» Sound is also a transverse wave.In which state the sound travels in transverse wave ? Explain.

Discussion

12745.	A car starting from rest picks up a velocity of 15m/s in 20 seconds. find the acceleration of the car.
Answer» A car starting from rest picks up a velocity of 15m/s in 20 seconds. find the acceleration of the car.

Discussion

12746.	Why does a long jumper runs before running?
Answer» Why does a long jumper runs before running?

Discussion

12747.	In bhors model of an atom it is said that electrons revevovle in discreet orbits in which they do not radiate energy so in the sub atomuc world physical laws are rejected
Answer» In bhors model of an atom it is said that electrons revevovle in discreet orbits in which they do not radiate energy so in the sub atomuc world physical laws are rejected

Discussion

12748.	Let's consider a situation. the earth is moving from West to East at a constant speed. now I am in a jet plane which is moving in the same constant speed as that of the earth but in opposite direction, in such a way that it apperapfrom space I am in that same position i.e at rest.But will someone from space tell that I am at rest in this aspect or will he say I am in motion by noticing that the earth is rotating but I am not being on earth?(in respect to him)
Answer» Let's consider a situation. the earth is moving from West to East at a constant speed. now I am in a jet plane which is moving in the same constant speed as that of the earth but in opposite direction, in such a way that it apperapfrom space I am in that same position i.e at rest.But will someone from space tell that I am at rest in this aspect or will he say I am in motion by noticing that the earth is rotating but I am not being on earth?(in respect to him)

Discussion

12749.	The distance between crest and through is 10m. Find the wavelength.
Answer» The distance between crest and through is 10m. Find the wavelength.

Discussion

12750.	What is a mechanical wave
Answer» What is a mechanical wave

Discussion

Explore topic-wise InterviewSolutions in .

Question 3 Calculate the wavelength of a sound wave whose frequency is 220 Hz and speed is 440 m/s in a given medium.

A ball falls vertically after being dropped. The ball falls a distance d metres in a time of t seconds. d is directly proportional to the square of t. The ball falls 20 metres in a time of 2 seconds. The time (in seconds) that the ball takes to fall 605 m is

Suppose that a boy skates at a rate of 2 ms−2. If the net force is tripled and the mass is halved, then what is the new acceleration of the skater?

A microscope has its main scale with 20 divisions in 1 cm and vernier scale with 25 divisions, the length of which is equal to the length of 24 divisions of main scale. The least count of microscope is : (a) 0.002 cm (b) 0.001 cm (c) 0.02 cm (d) 0.01 cm

The time periods of two simple pendulums at a place are in ratio 2 : 1. What will be the ratio of their length ?

Give reason for the following - A boy is carrying a box on his head and standing ;is he doing any work? Give reason .

The linear momentum of a ball of mass 50 g is 0.5 kg m s−1. Find its velocity.

In which medium, air or water, an echo is heard much sooner? Why ?

Show that the energy flow in an ecosystem is linear.

A body with an initial velocity of 18kmh accelerates uniformly at the rate of 3cms2 over a distance of 200 m in t s. What will be its be its velocity at time t?

A light-ray behaves as ________.

Ratio of the magnitude of displacement and the distance is equal or less than 1.Explain.

What is the value of 1 kg body on moon and what is its value?

Q. In the process of ultrasound cleaning, we take object which is to be clean and soak in the liquid, after that we produce ultrasound and the dirty particle viberates and it is removed. I want to know the name of that solution (with chemical formula) in which the object is soaked?

Sir, A body moving with a constant acceleration travels the distances 3m and 8m respectively in 1s and 2s. Calculate :(i) the initial velocity and (ii) the acceleration of the body. How​​ to solve this?

The same amount of pressure is applied on two different objects with different surface areas. In this scenario which of the following statements is correct?

What happens if the ear drum was not present in ear?

A particle of mass 1 kg was sliding with a velocity of 10 m/s on a rough floor. It comes to rest after 5 s. The rate at which floor warms up is ___ W.

If the mass of a ball is 5kg on the Earth, then what would be its mass on Jupiter?

The potential difference applied to an X -ray tube is 5 k V and the current through it is 3.2 mA. Then the number of the electrons striking the target per second is

Is it true that sun is not stationary and revolves or moves around the galaxy?

A box of mass 4.3kg is lifted diagonally from point A to point B as shown in the given figure. Given that the acceleration due to gravity is 10 ms−2, then the gravitational potential energy gained by the box will be ________.

Why do we need to go in same direction for uniform motion

The value of one newton

how does current flows in an electrolyte

A child is moving on a skateboard at a speed of 3 ms−1. After a force acts on him, his speed becomes 5 ms−1. What is the work done by the external force, given the mass of the object is 20 kg?

An object of weight 500 N is floating in a liquid. The magnitude of buoyant force acting on it is

During a negative beta decay, a neutron in the nucleus decays emitting an electron.

A bulb is connected to a cell. How is the resistance of circuit affected if another identical bulb is connected in series with the first bulb?

What is the up thrust experienced by a balloon of volume 120m3 filled with hydrogen. The density of air = 1.140 kgm3 and density of hydrogen = 0.081kgm3 at room temperature. What is the maximum weight this balloon can lift?

A 500 kg cloth bag is pulled up a smooth plane 6m long to platform 4m above the ground. The work done is: (Take g = 10 ms-2)

The floor of the swimming pool looks shallower than what it really is. What phenomenon is responsible for it?

What is acceleration due to gravity? If we take a paper and duster and drop from some height, which will reach first?

'Induced magnetism is temporary'. Comment on this statement.

What does the slope of velocity-time graph represent?

If the loudness of sound is to be increased 4 times then how many times should the amplitude be increased?

Differences between mass of an object and its weight? ( minimum 6 points)

Accelerates uniformly from 18 km per hour to 36 kilometre per hour in 5 seconds. Calculate:- 1) the acceleration and 2) the distance covered by the car in that time

Why is speed not considered as a vector quantity?

Derivation of s=ut+1/2(gt2

Question 163(i) Supply the missing information for each diagram.

Sound is also a transverse wave.In which state the sound travels in transverse wave ? Explain.

A car starting from rest picks up a velocity of 15m/s in 20 seconds. find the acceleration of the car.

Why does a long jumper runs before running?

In bhors model of an atom it is said that electrons revevovle in discreet orbits in which they do not radiate energy so in the sub atomuc world physical laws are rejected

The distance between crest and through is 10m. Find the wavelength.

What is a mechanical wave

Sir, A body moving with a constant acceleration travels the distances 3m and 8m respectively in 1s and 2s. Calculate :(i) the initial velocity and (ii) the acceleration of the body. How to solve this?