13232 + Interview Questions in Physics Page 130 InterviewSolution

6451.	What is resonant frequency of stretched string?
Answer» What is resonant frequency of stretched string?

Discussion

6452.	Write down the differences between simple and compound microscopes.
Answer» Write down the differences between simple and compound microscopes.

Discussion

6453.	What is work energy theorem
Answer» What is work energy theorem

Discussion

6454.	If a rock is brought to Earth from the surface of the moon, then __
Answer» If a rock is brought to Earth from the surface of the moon, then __

Discussion

6455.	Question 7 (b)A 8000 kg engine pulls a train of 5 wagons, each of 2000 kg, along a horizontal track. If the engine exerts a force of 40000 N and the track offers a friction force of 5000 N, then calculate:(b) the acceleration of the train.
Answer» Question 7 (b) A 8000 kg engine pulls a train of 5 wagons, each of 2000 kg, along a horizontal track. If the engine exerts a force of 40000 N and the track offers a friction force of 5000 N, then calculate: (b) the acceleration of the train.

Discussion

6456.	Weight of an astronaut and his space suit on the Earth is 60 kgf and 30 kgf respectively. Their combined weight on the Moon will be:
Answer» Weight of an astronaut and his space suit on the Earth is $60 k g f$ and $30 k g f$ respectively. Their combined weight on the Moon will be:

Discussion

6457.	Explain why it is dangerous to jump from a moving bus
Answer» Explain why it is dangerous to jump from a moving bus

Discussion

6458.	what is equivalent weight? what is its significance
Answer» what is equivalent weight? what is its significance

Discussion

6459.	Find the equivalent resistance between A & B in the circuit given below.
Answer» Find the equivalent resistance between A & B in the circuit given below.

Discussion

6460.	When the slope of v–t graph is negative and constant, what is the nature of acceleration? __
Answer» When the slope of v–t graph is negative and constant, what is the nature of acceleration? __

Discussion

6461.	What is the acceleration of a van that starts from rest and attains a speed of 20 ms−1 in 25 s?
Answer» What is the acceleration of a van that starts from rest and attains a speed of $20 m s^{- 1}$ in $25 s$ ?

Discussion

6462.	The three graphs A, B and C are speed vs time graphs of three cars. (None that these are not distance-time graphs)Identify the graphs from the clues.1. Mr Nair is a gentle driver. He lets the car pick up speed slowly.2. Ms Patnaik sometimes goes on a drive on an empty road. She enjoys cruising along at the same speed.3. Ms Rushmore is a racing car driver. She has just started a race.
Answer» The three graphs A, B and C are speed vs time graphs of three cars. (None that these are not distance-time graphs) Identify the graphs from the clues. 1. Mr Nair is a gentle driver. He lets the car pick up speed slowly. 2. Ms Patnaik sometimes goes on a drive on an empty road. She enjoys cruising along at the same speed. 3. Ms Rushmore is a racing car driver. She has just started a race.

6462.

The three graphs A, B and C are speed vs time graphs of three cars. (None that these are not distance-time graphs)Identify the graphs from the clues.1. Mr Nair is a gentle driver. He lets the car pick up speed slowly.2. Ms Patnaik sometimes goes on a drive on an empty road. She enjoys cruising along at the same speed.3. Ms Rushmore is a racing car driver. She has just started a race.

Answer»

The three graphs A, B and C are speed vs time graphs of three cars. (None that these are not distance-time graphs)

Identify the graphs from the clues.

1. Mr Nair is a gentle driver. He lets the car pick up speed slowly.

2. Ms Patnaik sometimes goes on a drive on an empty road. She enjoys cruising along at the same speed.

3. Ms Rushmore is a racing car driver. She has just started a race.

Discussion

6463.	A man weighing 50 kg lifts a weight of 30 kg to the top of building 10 m high. Find the work done by him. Take g=9.8m/s2
Answer» A man weighing 50 kg lifts a weight of 30 kg to the top of building 10 m high. Find the work done by him. Take $g = 9.8 m / s^{2}$

Discussion

6464.	Why copper and aluminium are used over tungsten, iron, nickel to make fuses?
Answer» Why copper and aluminium are used over tungsten, iron, nickel to make fuses?

Discussion

6465.	In a direct impact, loss in kinetic energy is given by ΔK=M1M22(M1+M2).(V1−V2)2(1−k2) with usual notations (except k). The quantity k will have dimensional formula:
Answer» In a direct impact, loss in kinetic energy is given by $Δ K = \frac{M_{1} M_{2}}{2 (M_{1} + M_{2})} . (V_{1} - V_{2})^{2} (1 - k^{2})$ with usual notations (except k). The quantity k will have dimensional formula:

Discussion

6466.	The echo receiver of a sonar attached to a ship, receives the echo from the bottom of sea 4 seconds after the ultrasonic waves were sent into the sea. If the speed of the sound in water is 1500 m/s, then what is the depth of the sea?
Answer» The echo receiver of a sonar attached to a ship, receives the echo from the bottom of sea 4 seconds after the ultrasonic waves were sent into the sea. If the speed of the sound in water is $1500 m/s$ , then what is the depth of the sea?

Discussion

6467.	If a person drops a pebble in a well of 100 m depth, after how much time will he be able to hear the sound, starting from the time he drops the pebble? (Take g=10 m/s2 and speed of sound =343 m/s)
Answer» If a person drops a pebble in a well of $100 m$ depth, after how much time will he be able to hear the sound, starting from the time he drops the pebble? (Take $g = 10 m / s^{2}$ and speed of sound $= 343 m / s$ )

Discussion

6468.	A change in the direction of a moving object results in a change in its
Answer» A change in the direction of a moving object results in a change in its

Discussion

6469.	125.Two blocks of mass M and m respectively are kept in contact on a frictionless table. The experimenter pushes M from behind so that the blocks accelerate. If M exerts a force 'R' on the m, what is F? A)RM/m B)R(1+M/m) C)RM/M D)R(1+m/M)
Answer» 125.Two blocks of mass M and m respectively are kept in contact on a frictionless table. The experimenter pushes M from behind so that the blocks accelerate. If M exerts a force 'R' on the m, what is F? A)RM/m B)R(1+M/m) C)RM/M D)R(1+m/M)

Discussion

6470.	With what speed in mileshr must an object be thrown vertically upwards to reach a height of 91.5 m?Take a=9.8ms2
Answer» With what speed in $\frac{m i l e s}{h r}$ must an object be thrown vertically upwards to reach a height of 91.5 m? $T a k e a = 9.8 \frac{m}{s^{2}}$

Discussion

6471.	A particle is projected vertically upwards from the surface of earth (radius R) with a kinetic energy equal to half of the minimum value needed for it to escape. The height to which it rises above the surface of earth is Options: Should have chosen R
Answer» A particle is projected vertically upwards from the surface of earth (radius R) with a kinetic energy equal to half of the minimum value needed for it to escape. The height to which it rises above the surface of earth is Options: Should have chosen R

Discussion

6472.	Question 4An astronaut standing on the surface of the moon throws a ball upwards. The ball would(a) directly fall down from the point it is released.(b) hang in space.(c) go up and then come back to the surface of the moon.(d) keep going up never to come back.
Answer» Question 4 An astronaut standing on the surface of the moon throws a ball upwards. The ball would (a) directly fall down from the point it is released. (b) hang in space. (c) go up and then come back to the surface of the moon. (d) keep going up never to come back.

Discussion

6473.	Name two units of power bigger than watt.
Answer» Name two units of power bigger than watt.

Discussion

6474.	Question 4A person is listening to a tone of 500 Hz sitting at a distance of 450 m from the source of the sound. What is the time interval between successive compressions from the source?
Answer» Question 4 A person is listening to a tone of 500 Hz sitting at a distance of 450 m from the source of the sound. What is the time interval between successive compressions from the source?

Discussion

6475.	For the given AC RLC circuit, at a particular frequency (f) of the AC source, the current leads the voltage by 45∘. The relation between R,L and C is -
Answer» For the given AC RLC circuit, at a particular frequency $(f)$ of the AC source, the current leads the voltage by $45^{\circ}$ . The relation between $R, L$ and $C$ is -

Discussion

6476.	Define1. Niche2. Food chain3. Decomposers4. Detritivores
Answer» Define 1. Niche 2. Food chain 3. Decomposers 4. Detritivores

6476.

Define1. Niche2. Food chain3. Decomposers4. Detritivores

Answer»

Define

1. Niche

2. Food chain

3. Decomposers

4. Detritivores

Discussion

6477.	Two masses 2 kg and 4 kg are connected at the two ends of a light inextensible string passing over a frictionless pulley. If the masses are released, then find the acceleration of the masses and the tension in the string.
Answer» Two masses 2 kg and 4 kg are connected at the two ends of a light inextensible string passing over a frictionless pulley. If the masses are released, then find the acceleration of the masses and the tension in the string.

Discussion

6478.	The physical quantity, that is generally used to describe how much a body has travelled is __________.
Answer» The physical quantity, that is generally used to describe how much a body has travelled is __________.

Discussion

6479.	Gravitation on moon is 1/6th of that on earth.when a balloon filled with hydrogen is released on moon then this 1- will rise with an acceleration less than g/6 2-will rise with acceleration g/6 3- will fall down with acceleration less than 5g/6 4- will fall down with acceleration g/6 And why?
Answer» Gravitation on moon is 1/6th of that on earth.when a balloon filled with hydrogen is released on moon then this 1- will rise with an acceleration less than g/6 2-will rise with acceleration g/6 3- will fall down with acceleration less than 5g/6 4- will fall down with acceleration g/6 And why?

Discussion

6480.	A body in uniformly accelerated motion travels 200 cm in the first two seconds and 220 cm in the next four seconds. The velocity at the end of seventh second from start is
Answer» A body in uniformly accelerated motion travels 200 cm in the first two seconds and 220 cm in the next four seconds. The velocity at the end of seventh second from start is

Discussion

6481.	The velocity (v) of a particle depends upon the time t according to the equation v=abe−btcosωt where a and b are positive constants. Then the dimension of b is
Answer» The velocity $(v)$ of a particle depends upon the time $t$ according to the equation $v = a b e^{- b t} cos ω t$ where $a$ and $b$ are positive constants. Then the dimension of $b$ is

Discussion

6482.	4. A student connects two lamps in the circuit shown.T he emf of the two batteries is different. Which of the following statements are correct? 1 When keys 1,2,3 and 4 are closed,bulbs A and B will both glow 2 When keys 2 and 4 are closed bulb A will glow 3 When 1 and 4 are closed,bulb A will golw 4 When 2,3 and 4 are closed ,both A and B will glow
Answer» 4. A student connects two lamps in the circuit shown.T he emf of the two batteries is different. Which of the following statements are correct? 1 When keys 1,2,3 and 4 are closed,bulbs A and B will both glow 2 When keys 2 and 4 are closed bulb A will glow 3 When 1 and 4 are closed,bulb A will golw 4 When 2,3 and 4 are closed ,both A and B will glow

Discussion

6483.	If the same force acts on two bodies of different masses which are initially at rest and gain same displacement, then the ratio of time for which these forces act is:
Answer» If the same force acts on two bodies of different masses which are initially at rest and gain same displacement, then the ratio of time for which these forces act is:

Discussion

6484.	What is a Hearing aid? 1. An electronic, battery operated device which can be worn by people with hearing loss in or behind their ear . 2. It makes sound louder so that a person with hearing loss can hear it better. 3. Receives sound through a microphone and converts it to an electrical signal. 4. Amplifies the electrical signal and retransmits them as sound using speakers. Which of the above statements is correct?
Answer» What is a Hearing aid? 1. An electronic, battery operated device which can be worn by people with hearing loss in or behind their ear . 2. It makes sound louder so that a person with hearing loss can hear it better. 3. Receives sound through a microphone and converts it to an electrical signal. 4. Amplifies the electrical signal and retransmits them as sound using speakers. Which of the above statements is correct?

6484.

What is a Hearing aid? 1. An electronic, battery operated device which can be worn by people with hearing loss in or behind their ear . 2. It makes sound louder so that a person with hearing loss can hear it better. 3. Receives sound through a microphone and converts it to an electrical signal. 4. Amplifies the electrical signal and retransmits them as sound using speakers. Which of the above statements is correct?

Answer»

What is a Hearing aid?

1. An electronic, battery operated device which can be worn by people with hearing loss in or behind their ear .

2. It makes sound louder so that a person with hearing loss can hear it better.

3. Receives sound through a microphone and converts it to an electrical signal.

4. Amplifies the electrical signal and retransmits them as sound using speakers.

Which of the above statements is correct?

Discussion

6485.	When is a body said to have uniform velocity?
Answer» When is a body said to have uniform velocity?

Discussion

6486.	A 4 kg block A is placed on the top of 8 kg block B which rests on a smooth table. A just slips on B when a force of 12 N is applied on A.Then the maximum horizontal force F applied on Bto make both A and B move together, is (a) 12 N (c) 36 N (b) 24 N (d) 48 N
Answer» A 4 kg block A is placed on the top of 8 kg block B which rests on a smooth table. A just slips on B when a force of 12 N is applied on A.Then the maximum horizontal force F applied on Bto make both A and B move together, is (a) 12 N (c) 36 N (b) 24 N (d) 48 N

Discussion

6487.	(a) Explain the terms 'crests' and 'troughs of a wave? What type of waves consist of crests and troughs?(b) The flash of a gun is seen by man 3 seconds before the sound is heard. Calculate the distance of the gun from the man (Speed of sound in air is 332 m/s).
Answer» (a) Explain the terms 'crests' and 'troughs of a wave? What type of waves consist of crests and troughs? (b) The flash of a gun is seen by man 3 seconds before the sound is heard. Calculate the distance of the gun from the man (Speed of sound in air is 332 m/s).

Discussion

6488.	The tone of the narrator is one of ____________. (i) joy (ii) nostalgia (iii) regret (iv) sorrow
Answer» The tone of the narrator is one of ____________. (i) joy (ii) nostalgia (iii) regret (iv) sorrow

6488.

The tone of the narrator is one of ____________. (i) joy (ii) nostalgia (iii) regret (iv) sorrow

Answer»

The tone
of the narrator is one of ____________.

(i) joy

(ii)
nostalgia

(iii)
regret

(iv)
sorrow

Discussion

6489.	The mass of an oxygen atom is 16.00u. Find its mass in kg.
Answer» The mass of an oxygen atom is 16.00u. Find its mass in kg.

Discussion

6490.	Why s gas bubble released at the bottom of a lake grows in size as it rises to the surface of the lake
Answer» Why s gas bubble released at the bottom of a lake grows in size as it rises to the surface of the lake

Discussion

6491.	A perfect gas goes from state A to State B by absorbing 8×10^5joule and doing 6.5×10^5joule of external work .If it is taken from same initial state A to final state B in another process in which it absorbs 10^5joule of heat then what will be the work done in the second process?
Answer» A perfect gas goes from state A to State B by absorbing 8×10^5joule and doing 6.5×10^5joule of external work .If it is taken from same initial state A to final state B in another process in which it absorbs 10^5joule of heat then what will be the work done in the second process?

Discussion

6492.	When a body is brought from infinity to a point the angle between the gravitational force and the direction of motion of the body is 0 degree then why is the work done by the gravitational force negative??
Answer» When a body is brought from infinity to a point the angle between the gravitational force and the direction of motion of the body is 0 degree then why is the work done by the gravitational force negative??

Discussion

6493.	If an atwood system us given with two blocks of same mass are there. if an acceleration is given then will the centre of mass for each case be same?
Answer» If an atwood system us given with two blocks of same mass are there. if an acceleration is given then will the centre of mass for each case be same?

Discussion

6494.	Explain, with the help of a distance-time graph, what is meant by uniform motion.
Answer» Explain, with the help of a distance-time graph, what is meant by uniform motion.

Discussion

6495.	What is the maximum intensity level that can be heard by human ear?
Answer» What is the maximum intensity level that can be heard by human ear?

Discussion

6496.	A force with constant magnitude is acting on a particle, which is always perpendicular to the velocity of particle moving in a plane then
Answer» A force with constant magnitude is acting on a particle, which is always perpendicular to the velocity of particle moving in a plane then

Discussion

6497.	What is Archemids principle
Answer» What is Archemids principle

Discussion

6498.	Which of the two can be zero under certain conditions: average speed or average velocity of a moving body?
Answer» Which of the two can be zero under certain conditions: average speed or average velocity of a moving body?

Discussion

6499.	A planet revolves around the sun in an elliptical orbit of eccentricity e. If T is the time period of the planet then the time spent by the planet while moving from closest point to the sun to the end points of minor axis is[For ellipse eccentricity , 0<e<1]
Answer» A planet revolves around the sun in an elliptical orbit of eccentricity $e$ . If $T$ is the time period of the planet then the time spent by the planet while moving from closest point to the sun to the end points of minor axis is [For ellipse eccentricity , $0 < e < 1$ ]

Discussion

6500.	A missile has been fired with an initial velocity u. If the velocity is tripled, what will be the corresponding change in its kinetic energy?
Answer» A missile has been fired with an initial velocity $u .$ If the velocity is tripled, what will be the corresponding change in its kinetic energy?

Discussion

Explore topic-wise InterviewSolutions in .

What is resonant frequency of stretched string?

Write down the differences between simple and compound microscopes.

What is work energy theorem

If a rock is brought to Earth from the surface of the moon, then __

Question 7 (b)A 8000 kg engine pulls a train of 5 wagons, each of 2000 kg, along a horizontal track. If the engine exerts a force of 40000 N and the track offers a friction force of 5000 N, then calculate:(b) the acceleration of the train.

Weight of an astronaut and his space suit on the Earth is 60 kgf and 30 kgf respectively. Their combined weight on the Moon will be:

Explain why it is dangerous to jump from a moving bus

what is equivalent weight? what is its significance

Find the equivalent resistance between A &amp; B in the circuit given below.

When the slope of v–t graph is negative and constant, what is the nature of acceleration? __

What is the acceleration of a van that starts from rest and attains a speed of 20 ms−1 in 25 s?

A man weighing 50 kg lifts a weight of 30 kg to the top of building 10 m high. Find the work done by him. Take g=9.8m/s2

Why copper and aluminium are used over tungsten, iron, nickel to make fuses?

In a direct impact, loss in kinetic energy is given by ΔK=M1M22(M1+M2).(V1−V2)2(1−k2) with usual notations (except k). The quantity k will have dimensional formula:

The echo receiver of a sonar attached to a ship, receives the echo from the bottom of sea 4 seconds after the ultrasonic waves were sent into the sea. If the speed of the sound in water is 1500 m/s, then what is the depth of the sea?

If a person drops a pebble in a well of 100 m depth, after how much time will he be able to hear the sound, starting from the time he drops the pebble? (Take g=10 m/s2 and speed of sound =343 m/s)

A change in the direction of a moving object results in a change in its

125.Two blocks of mass M and m respectively are kept in contact on a frictionless table. The experimenter pushes M from behind so that the blocks accelerate. If M exerts a force 'R' on the m, what is F? A)RM/m B)R(1+M/m) C)RM/M D)R(1+m/M)

With what speed in mileshr must an object be thrown vertically upwards to reach a height of 91.5 m?Take a=9.8ms2

A particle is projected vertically upwards from the surface of earth (radius R) with a kinetic energy equal to half of the minimum value needed for it to escape. The height to which it rises above the surface of earth is Options: Should have chosen R

Question 4An astronaut standing on the surface of the moon throws a ball upwards. The ball would(a) directly fall down from the point it is released.(b) hang in space.(c) go up and then come back to the surface of the moon.(d) keep going up never to come back.

Name two units of power bigger than watt.

Question 4A person is listening to a tone of 500 Hz sitting at a distance of 450 m from the source of the sound. What is the time interval between successive compressions from the source?

For the given AC RLC circuit, at a particular frequency (f) of the AC source, the current leads the voltage by 45∘. The relation between R,L and C is -

Define1. Niche2. Food chain3. Decomposers4. Detritivores

Two masses 2 kg and 4 kg are connected at the two ends of a light inextensible string passing over a frictionless pulley. If the masses are released, then find the acceleration of the masses and the tension in the string.

The physical quantity, that is generally used to describe how much a body has travelled is __________.

Gravitation on moon is 1/6th of that on earth.when a balloon filled with hydrogen is released on moon then this 1- will rise with an acceleration less than g/6 2-will rise with acceleration g/6 3- will fall down with acceleration less than 5g/6 4- will fall down with acceleration g/6 And why?

A body in uniformly accelerated motion travels 200 cm in the first two seconds and 220 cm in the next four seconds. The velocity at the end of seventh second from start is

The velocity (v) of a particle depends upon the time t according to the equation v=abe−btcosωt where a and b are positive constants. Then the dimension of b is

If the same force acts on two bodies of different masses which are initially at rest and gain same displacement, then the ratio of time for which these forces act is:

When is a body said to have uniform velocity?

A 4 kg block A is placed on the top of 8 kg block B which rests on a smooth table. A just slips on B when a force of 12 N is applied on A.Then the maximum horizontal force F applied on Bto make both A and B move together, is (a) 12 N (c) 36 N (b) 24 N (d) 48 N

(a) Explain the terms 'crests' and 'troughs of a wave? What type of waves consist of crests and troughs?​(b) The flash of a gun is seen by man 3 seconds before the sound is heard. Calculate the distance of the gun from the man (Speed of sound in air is 332 m/s).

The tone of the narrator is one of ____________. (i) joy (ii) nostalgia (iii) regret (iv) sorrow

The mass of an oxygen atom is 16.00u. Find its mass in kg.

Why s gas bubble released at the bottom of a lake grows in size as it rises to the surface of the lake

A perfect gas goes from state A to State B by absorbing 8×10^5joule and doing 6.5×10^5joule of external work .If it is taken from same initial state A to final state B in another process in which it absorbs 10^5joule of heat then what will be the work done in the second process?

When a body is brought from infinity to a point the angle between the gravitational force and the direction of motion of the body is 0 degree then why is the work done by the gravitational force negative??

If an atwood system us given with two blocks of same mass are there. if an acceleration is given then will the centre of mass for each case be same?

Explain, with the help of a distance-time graph, what is meant by uniform motion.

What is the maximum intensity level that can be heard by human ear?

A force with constant magnitude is acting on a particle, which is always perpendicular to the velocity of particle moving in a plane then

What is Archemids principle

Which of the two can be zero under certain conditions: average speed or average velocity of a moving body?

A planet revolves around the sun in an elliptical orbit of eccentricity e. If T is the time period of the planet then the time spent by the planet while moving from closest point to the sun to the end points of minor axis is[For ellipse eccentricity , 0&lt;e&lt;1]

A missile has been fired with an initial velocity u. If the velocity is tripled, what will be the corresponding change in its kinetic energy?

Find the equivalent resistance between A & B in the circuit given below.

(a) Explain the terms 'crests' and 'troughs of a wave? What type of waves consist of crests and troughs?(b) The flash of a gun is seen by man 3 seconds before the sound is heard. Calculate the distance of the gun from the man (Speed of sound in air is 332 m/s).

A planet revolves around the sun in an elliptical orbit of eccentricity e. If T is the time period of the planet then the time spent by the planet while moving from closest point to the sun to the end points of minor axis is[For ellipse eccentricity , 0<e<1]