13232 + Interview Questions in Physics Page 122 InterviewSolution

6051.	The velocity-time graph for part of a train journey is a horizontal straight line. What does this tell you about (a) The train's velocity, and (b) about its acceleration ?
Answer» The velocity-time graph for part of a train journey is a horizontal straight line. What does this tell you about (a) The train's velocity, and (b) about its acceleration ?

6051.

The velocity-time graph for part of a train journey is a horizontal straight line. What does this tell you about (a) The train's velocity, and (b) about its acceleration ?

Answer»

The velocity-time graph for part of a train journey is a horizontal straight line. What does this tell you about

(a) The train's velocity, and

(b) about its acceleration ?

6052.	A man in a ballon, throws a stone downwards with a speed of 5 m/s with respect to ballon. The balloon is moving upwards with a constant acceleration of 5 m/s2. Then the velocity of the stone relative to the man after 2 sec is (take g=10 m/sec2):
Answer» A man in a ballon, throws a stone downwards with a speed of $5 m/s$ with respect to ballon. The balloon is moving upwards with a constant acceleration of $5 {m/s}^{2}$ . Then the velocity of the stone relative to the man after $2 sec$ is (take $g = 10 {m/sec}^{2}$ ):

Discussion

6053.	In the circuit shown, reading of the voltmeter connected across 400 Ω resistance is 30 V. If it is connected across 300 Ω resistance then reading will be 900x V. The value of x is (integer only)
Answer» In the circuit shown, reading of the voltmeter connected across $400 Ω$ resistance is $30 V .$ If it is connected across $300 Ω$ resistance then reading will be $\frac{900}{x} V .$ The value of $x$ is (integer only)

Discussion

6054.	Charges 2q and −q are placed at (a,0) and (−a,0) as shown in the figure. The coordinates of the point at which electric field intensity is zero is (x,0). Then:
Answer» Charges $2 q$ and $- q$ are placed at $(a, 0)$ and $(- a, 0)$ as shown in the figure. The coordinates of the point at which electric field intensity is zero is $(x, 0)$ . Then:

Discussion

6055.	Mahendra and virat are sitting at a distance of 1 metre from each other. Their massesare 75 kg and 80 kg respectively. What is the gravitational force between them ?
Answer» Mahendra and virat are sitting at a distance of 1 metre from each other. Their massesare 75 kg and 80 kg respectively. What is the gravitational force between them ?

Discussion

6056.	A train is moving with a velocity of 400 m/s. With the application of brakes a retardation of 10m/s2 is produced. Calculate the following : (i) Time taken to come to rest (ii) Braking distance [5 MARKS]
Answer» A train is moving with a velocity of 400 m/s. With the application of brakes a retardation of $10 m / s^{2}$ is produced. Calculate the following : (i) Time taken to come to rest (ii) Braking distance [5 MARKS]

Discussion

6057.	What is inertia?
Answer» What is inertia?

Discussion

6058.	what is organ pipe 1.open & closed?
Answer» what is organ pipe 1.open & closed?

Discussion

6059.	20oC corresponds to _______ .
Answer» 20^oC corresponds to _______ .

Discussion

6060.	two satellites of mass m and 2m are revolvung i two circular orbits of r and 2r around imaginary planet on the surface of with gravitational force is inversely proportional to dis†an ce from its centre. ratio of orbital speed of satellit
Answer» two satellites of mass m and 2m are revolvung i two circular orbits of r and 2r around imaginary planet on the surface of with gravitational force is inversely proportional to dis†an ce from its centre. ratio of orbital speed of satellit

Discussion

6061.	A potential difference is created in an electric circuit due to a ___ .
Answer» A potential difference is created in an electric circuit due to a ___ .

Discussion

6062.	The displacement(s) and time(t) graphs for two moving objects A and B are straight lines inclined at 30∘ with the time axis and 30∘ with the displacement axis respectively. Then, what would be their velocity ratio?
Answer» The displacement $(s)$ and time $(t)$ graphs for two moving objects $A$ and $B$ are straight lines inclined at $30^{\circ}$ with the time axis and $30^{\circ}$ with the displacement axis respectively. Then, what would be their velocity ratio?

Discussion

6063.	State which of the following situations are possible and give an example for each of these:(a) an object with a constant acceleration but with zero velocity.(b) an object moving with an acceleration but with uniform speed.
Answer» State which of the following situations are possible and give an example for each of these: (a) an object with a constant acceleration but with zero velocity. (b) an object moving with an acceleration but with uniform speed.

Discussion

6064.	37.Explain principle of van de Graff generator and ac generator?
Answer» 37.Explain principle of van de Graff generator and ac generator?

Discussion

6065.	What is the law of inertia?
Answer» What is the law of inertia?

Discussion

6066.	Question 14An object 5.0 cm in length is placed at a distance of 20 cm in front of a convex mirror of radius of curvature 30 cm. Find the position of the image, its nature and size.
Answer» Question 14 An object 5.0 cm in length is placed at a distance of 20 cm in front of a convex mirror of radius of curvature 30 cm. Find the position of the image, its nature and size.

Discussion

6067.	When a car stops suddenly we fall forwards, this is because:
Answer» When a car stops suddenly we fall forwards, this is because:

Discussion

6068.	What is gram molecular weight? How to calculate it?
Answer» What is gram molecular weight? How to calculate it?

Discussion

6069.	When water is filled carefully in a glass, one can fill it to a height h above the rim of the glass due to the surface tension of water. To calculate h just before water starts flowing, model the shape of the water above the rim as a disc of thickness h having semicircular edges, as shown schematically in the figure. When the pressure of water at the bottom of this disc exceeds what can be withstood due to the surface tension, the water surface breaks near the rim and water starts flowing from there. If the density of water, its surface tension and the acceleration due to gravity are 103 kg/m3 , 0.07 Nm−1 and 10 ms−2 , respectively, the value of h (in mm) is
Answer» When water is filled carefully in a glass, one can fill it to a height $h$ above the rim of the glass due to the surface tension of water. To calculate $h$ just before water starts flowing, model the shape of the water above the rim as a disc of thickness $h$ having semicircular edges, as shown schematically in the figure. When the pressure of water at the bottom of this disc exceeds what can be withstood due to the surface tension, the water surface breaks near the rim and water starts flowing from there. If the density of water, its surface tension and the acceleration due to gravity are $10^{3}$ ${kg/m}^{3}$ , $0.07$ ${Nm}^{- 1}$ and $10 {ms}^{- 2}$ , respectively, the value of $h$ (in mm) is

Discussion

6070.	A spherical air bubble is at the depth of 10 cm below the surface of water. If radius of the air bubble is 0.1 mm, then total pressure inside the air bubble will be nearly (Take surface tension of water 0.08 N/m and density of water 103 kg/m3, atmospheric pressure 1.01 × 105 Pa and g = 10 m/s2)
Answer» A spherical air bubble is at the depth of 10 cm below the surface of water. If radius of the air bubble is 0.1 mm, then total pressure inside the air bubble will be nearly (Take surface tension of water 0.08 N/m and density of water 103 kg/m3, atmospheric pressure 1.01 × 105 Pa and g = 10 m/s2)

Discussion

6071.	A force, when applied on a body, can
Answer» A force, when applied on a body, can

Discussion

6072.	a car accelerates from rest at cons†an t rate 2m/s^2 for some time.then it retards at cons†an t rate 4m/s^2 and comes to rest .if the total time of motion be 3s,then total dis†an ce travelled by car is
Answer» a car accelerates from rest at cons†an t rate 2m/s^2 for some time.then it retards at cons†an t rate 4m/s^2 and comes to rest .if the total time of motion be 3s,then total dis†an ce travelled by car is

Discussion

6073.	A body of mass 100 kg is lifted up by 10 m. Find : (i) the amount of work done. (ii) potential energy of the body at that height (value of g = 10 m/s2)
Answer» A body of mass 100 kg is lifted up by 10 m. Find : (i) the amount of work done. (ii) potential energy of the body at that height (value of g = 10 $m / s^{2}$ )

6073.

A body of mass 100 kg is lifted up by 10 m. Find : (i) the amount of work done. (ii) potential energy of the body at that height (value of g = 10 m/s2)

Answer»

A body of mass 100 kg is lifted up by 10 m. Find :

(i) the amount of work done.

(ii) potential energy of the body at that height (value of g = 10 $m / s^{2}$ )

Discussion

6074.	Robbers in a car travelling at 20 m per second pass a police man on a motorcycle at rest the police man immediately start chasing the robbers. The policeman accelerates at 3 metre per second square for 12 seconds and thereafter Travels at a constant velocity. Calculate the distance covered by the police man before he overtakes the car.
Answer» Robbers in a car travelling at 20 m per second pass a police man on a motorcycle at rest the police man immediately start chasing the robbers. The policeman accelerates at 3 metre per second square for 12 seconds and thereafter Travels at a constant velocity. Calculate the distance covered by the police man before he overtakes the car.

Discussion

6075.	Newton's second law states that if no net force is exerted on a system,no acceleration occurs.Does it follow that no change in momentum occurs?
Answer» Newton's second law states that if no net force is exerted on a system,no acceleration occurs.Does it follow that no change in momentum occurs?

Discussion

6076.	One of the rectangular component of a force 40n is 20n find the angle it makes with this component and magnitude of other components.
Answer» One of the rectangular component of a force 40n is 20n find the angle it makes with this component and magnitude of other components.

Discussion

6077.	mark correct statement( multiple correct options) 1. if the velocity & acceleration have opposite signs 2. if the position & velocity have opposite signs, the particle is moving towards the origin 3. if the velocity is zero at an ins†an t , the acceleration should also be 0 at that ins†an t 4.if the velocity is 0 for a time interval ,the acceleration is 0 at any instant with interva
Answer» mark correct statement( multiple correct options) 1. if the velocity & acceleration have opposite signs 2. if the position & velocity have opposite signs, the particle is moving towards the origin 3. if the velocity is zero at an ins†an t , the acceleration should also be 0 at that ins†an t 4.if the velocity is 0 for a time interval ,the acceleration is 0 at any instant with interva

Discussion

6078.	Sometimes we hear that beep sound in our ear. Why does it happen?
Answer» Sometimes we hear that beep sound in our ear. Why does it happen?

Discussion

6079.	A 10 H.P. motor pumps out water from a well of depth 20m and fills a water tank of volume 22380 litres at a height of 10m from the ground. The running time of the motor to fill the empty water tank is (g=10ms−2)
Answer» A 10 H.P. motor pumps out water from a well of depth 20m and fills a water tank of volume 22380 litres at a height of 10m from the ground. The running time of the motor to fill the empty water tank is ( $g = 10 m s^{- 2}$ )

Discussion

6080.	400g of iron is heated to increase its temperature by 10∘C. If the same quantity of heat is given to 200g of water, the rise in its temperature is ___ ∘C (specific heat of iron = 420J/kg/∘C, specific heat of water = 4200J/kg/∘C)
Answer» $400 g$ of iron is heated to increase its temperature by $10^{\circ} C$ . If the same quantity of heat is given to $200 g$ of water, the rise in its temperature is ___ $^{\circ} C$ (specific heat of iron = $420 J / k g /^{\circ} C$ , specific heat of water = $4200 J / k g /^{\circ} C$ )

Discussion

6081.	The potential energy of a freely falling object decreases progressively what do you understand by EP DECREASING PROGRESSIVELY. Does this violate the law of conservation of energy
Answer» The potential energy of a freely falling object decreases progressively what do you understand by E_PDECREASING PROGRESSIVELY. Does this violate the law of conservation of energy

Discussion

6082.	the force exerted on anobject is F=f_0 (x/a -1) find the work done in moving the object from x=0 to x=3a
Answer» the force exerted on anobject is F=f_0 (x/a -1) find the work done in moving the object from x=0 to x=3a

Discussion

6083.	A cubical block of wood of specific gravity 0.5 and chunk of concrete of specific gravity 2.5 are fastened together. The ratio of the mass of the wood to the mass of the concrete, which makes the combination to float with its entire volume submerged under water is
Answer» A cubical block of wood of specific gravity 0.5 and chunk of concrete of specific gravity 2.5 are fastened together. The ratio of the mass of the wood to the mass of the concrete, which makes the combination to float with its entire volume submerged under water is

Discussion

6084.	If a = c and b = c, then we can say,
Answer» If a = c and b = c, then we can say,

Discussion

6085.	Which has the higher frequency - ultrasonic sound or infrasonic sound ?
Answer» Which has the higher frequency - ultrasonic sound or infrasonic sound ?

Discussion

6086.	A stone is thrown vertically upwards. On its way up it passes point A with speed v and point B, 3m higher than A, with speed v/2. The maximum height reached by the stone above point B is
Answer» A stone is thrown vertically upwards. On its way up it passes point A with speed v and point B, 3m higher than A, with speed v/2. The maximum height reached by the stone above point B is

Discussion

6087.	A bullet of 5 g is fired from a pistol of 1.5 kg. If the recoil velocity of pistol is 1.5 ms−1, what is the final momentum of the pistol?
Answer» A bullet of 5 g is fired from a pistol of 1.5 kg. If the recoil velocity of pistol is $1.5 m s^{- 1}$ , what is the final momentum of the pistol?

Discussion

6088.	A steel tape is calibrated at 20 degree Celsius . when the temperature of the day is -10 degree Celsius , the percentage error in the measurement with the tape is ( linear coefficient 12 x 10 to the exponent -6 / degree Celsius ) 1. 3.6% 2. 0.36% 3. 0.18 % 4. 0.036%
Answer» A steel tape is calibrated at 20 degree Celsius . when the temperature of the day is -10 degree Celsius , the percentage error in the measurement with the tape is ( linear coefficient 12 x 10 to the exponent -6 / degree Celsius ) 1. 3.6% 2. 0.36% 3. 0.18 % 4. 0.036%

Discussion

6089.	casket grey
Answer» casket grey

Discussion

6090.	the dis†an ce between compression and the next rarefaction of a sound wave 12.5 cm . if the sound wave can travell 750 m in 3 s, then find the number waves in 1 s.
Answer» the dis†an ce between compression and the next rarefaction of a sound wave 12.5 cm . if the sound wave can travell 750 m in 3 s, then find the number waves in 1 s.

Discussion

6091.	Two plates are connected by fillet welds of size 8mm and subjected to a tensile force of 350kN. The thickness of each plate is 12mm. The yield stress and ultimate stress of steel are 250MPa and 410MPa respectively. As per IS 800 : 2007, the length (l) required to transmit the load is ____mm. (The welding is done at site).145
Answer» Two plates are connected by fillet welds of size $8 m m$ and subjected to a tensile force of $350 k N$ . The thickness of each plate is $12 m m$ . The yield stress and ultimate stress of steel are $250 M P a$ and $410 M P a$ respectively. As per IS 800 : 2007, the length $(l)$ required to transmit the load is ____mm. (The welding is done at site). 145

Discussion

6092.	Do moving gas molecules show the property of elasticity?
Answer» Do moving gas molecules show the property of elasticity?

Discussion

6093.	4 Students a, b, c and d in a group take 6 metre long slinky and produce a longitudinal wave they observe that in 10 seconds 4 waves are completed. On this observation what is the speed of wave in slinky.
Answer» 4 Students a, b, c and d in a group take 6 metre long slinky and produce a longitudinal wave they observe that in 10 seconds 4 waves are completed. On this observation what is the speed of wave in slinky.

Discussion

6094.	62.How many mega coulombs of negative or positive charge are present in one mole of neutral hydrogen gas? Take Avogadro's number,NA=6.02*10²³
Answer» 62.How many mega coulombs of negative or positive charge are present in one mole of neutral hydrogen gas? Take Avogadro's number,NA=6.02*10²³

Discussion

6095.	What determines the color of a spark
Answer» What determines the color of a spark

Discussion

6096.	initially mass m is held such that spring is in relaxed condition if mass m is suddenly released , maximum elongation in spring will be
Answer» initially mass m is held such that spring is in relaxed condition if mass m is suddenly released , maximum elongation in spring will be

Discussion

6097.	In Activity 13.7, how do we think the displacement of rod AB will be affected if (iii) length of the rod AB is increased?
Answer» In Activity 13.7, how do we think the displacement of rod AB will be affected if (iii) length of the rod AB is increased?

Discussion

6098.	A train and a car start together from a point. The train's speed is 80 kmph and the car's speed is 60% of the train's speed. The train crosses a station in 15 minutes. How much distance will the car travel in the time the train takes to cross 3 stations? (Assume constant distance between consecutive stations)
Answer» A train and a car start together from a point. The train's speed is 80 kmph and the car's speed is 60% of the train's speed. The train crosses a station in 15 minutes. How much distance will the car travel in the time the train takes to cross 3 stations? (Assume constant distance between consecutive stations)

Discussion

6099.	A particle is thrown upward with a velocity of 50m/sec .what will be the velocity at its highest point of the journey. How high the particle rise. What time would it taken to reach the highest point (g=10m/sec)
Answer» A particle is thrown upward with a velocity of 50m/sec .what will be the velocity at its highest point of the journey. How high the particle rise. What time would it taken to reach the highest point (g=10m/sec)

Discussion

6100.	An empty density bottle weighs 22 g. When completely filled with water it weighs 50 g and when completely filled with brine solution it weighs 54 g. Calculate the density of the brine solution.
Answer» An empty density bottle weighs 22 g. When completely filled with water it weighs 50 g and when completely filled with brine solution it weighs 54 g. Calculate the density of the brine solution.

6100.

An empty density bottle weighs 22 g. When completely filled with water it weighs 50 g and when completely filled with brine solution it weighs 54 g. Calculate the density of the brine solution.

Answer»

An empty density bottle weighs 22 g. When completely filled with water it weighs 50 g and when completely filled with brine solution it weighs 54 g. Calculate the density of the brine solution.

Discussion

Explore topic-wise InterviewSolutions in .

The velocity-time graph for part of a train journey is a horizontal straight line. What does this tell you about (a) The train's velocity, and (b) about its acceleration ?

A man in a ballon, throws a stone downwards with a speed of 5 m/s with respect to ballon. The balloon is moving upwards with a constant acceleration of 5 m/s2. Then the velocity of the stone relative to the man after 2 sec is (take g=10 m/sec2):

In the circuit shown, reading of the voltmeter connected across 400 Ω resistance is 30 V. If it is connected across 300 Ω resistance then reading will be 900x V. The value of x is (integer only)

Charges 2q and −q are placed at (a,0) and (−a,0) as shown in the figure. The coordinates of the point at which electric field intensity is zero is (x,0). Then:

Mahendra and virat are sitting at a distance of 1 metre from each other. Their massesare 75 kg and 80 kg respectively. What is the gravitational force between them ?

A train is moving with a velocity of 400 m/s. With the application of brakes a retardation of 10m/s2 is produced. Calculate the following : (i) Time taken to come to rest (ii) Braking distance [5 MARKS]

What is inertia?

what is organ pipe 1.open & closed?

20oC corresponds to _______ .

two satellites of mass m and 2m are revolvung i two circular orbits of r and 2r around imaginary planet on the surface of with gravitational force is inversely proportional to dis†an ce from its centre. ratio of orbital speed of satellit

A potential difference is created in an electric circuit due to a ___ .

The displacement(s) and time(t) graphs for two moving objects A and B are straight lines inclined at 30∘ with the time axis and 30∘ with the displacement axis respectively. Then, what would be their velocity ratio?

State which of the following situations are possible and give an example for each of these:​(a) an object with a constant acceleration but with zero velocity.​(b) an object moving with an acceleration but with uniform speed.​

37.Explain principle of van de Graff generator and ac generator?

What is the law of inertia?

Question 14An object 5.0 cm in length is placed at a distance of 20 cm in front of a convex mirror of radius of curvature 30 cm. Find the position of the image, its nature and size.

When a car stops suddenly we fall forwards, this is because:

What is gram molecular weight? How to calculate it?

A spherical air bubble is at the depth of 10 cm below the surface of water. If radius of the air bubble is 0.1 mm, then total pressure inside the air bubble will be nearly (Take surface tension of water 0.08 N/m and density of water 103 kg/m3, atmospheric pressure 1.01 × 105 Pa and g = 10 m/s2)

A force, when applied on a body, can

a car accelerates from rest at cons†an t rate 2m/s^2 for some time.then it retards at cons†an t rate 4m/s^2 and comes to rest .if the total time of motion be 3s,then total dis†an ce travelled by car is

A body of mass 100 kg is lifted up by 10 m. Find : (i) the amount of work done. (ii) potential energy of the body at that height (value of g = 10 m/s2)

Newton's second law states that if no net force is exerted on a system,no acceleration occurs.Does it follow that no change in momentum occurs?

One of the rectangular component of a force 40n is 20n find the angle it makes with this component and magnitude of other components.

Sometimes we hear that beep sound in our ear. Why does it happen?

A 10 H.P. motor pumps out water from a well of depth 20m and fills a water tank of volume 22380 litres at a height of 10m from the ground. The running time of the motor to fill the empty water tank is (g=10ms−2)

400g of iron is heated to increase its temperature by 10∘C. If the same quantity of heat is given to 200g of water, the rise in its temperature is ___ ∘C (specific heat of iron = 420J/kg/∘C, specific heat of water = 4200J/kg/∘C)

The potential energy of a freely falling object decreases progressively what do you understand by EP DECREASING PROGRESSIVELY. Does this violate the law of conservation of energy

the force exerted on anobject is F=f_0 (x/a -1) find the work done in moving the object from x=0 to x=3a

A cubical block of wood of specific gravity 0.5 and chunk of concrete of specific gravity 2.5 are fastened together. The ratio of the mass of the wood to the mass of the concrete, which makes the combination to float with its entire volume submerged under water is

If a = c and b = c, then we can say,

Which has the higher frequency - ultrasonic sound or infrasonic sound ?

A stone is thrown vertically upwards. On its way up it passes point A with speed v and point B, 3m higher than A, with speed v/2. The maximum height reached by the stone above point B is

A bullet of 5 g is fired from a pistol of 1.5 kg. If the recoil velocity of pistol is 1.5 ms−1, what is the final momentum of the pistol?

A steel tape is calibrated at 20 degree Celsius . when the temperature of the day is -10 degree Celsius , the percentage error in the measurement with the tape is ( linear coefficient 12 x 10 to the exponent -6 / degree Celsius ) 1. 3.6% 2. 0.36% 3. 0.18 % 4. 0.036%

casket grey

the dis†an ce between compression and the next rarefaction of a sound wave 12.5 cm . if the sound wave can travell 750 m in 3 s, then find the number waves in 1 s.

Do moving gas molecules show the property of elasticity?

4 Students a, b, c and d in a group take 6 metre long slinky and produce a longitudinal wave they observe that in 10 seconds 4 waves are completed. On this observation what is the speed of wave in slinky.

62.How many mega coulombs of negative or positive charge are present in one mole of neutral hydrogen gas? Take Avogadro's number,NA=6.02*10²³

What determines the color of a spark

initially mass m is held such that spring is in relaxed condition if mass m is suddenly released , maximum elongation in spring will be

In Activity 13.7, how do we think the displacement of rod AB will be affected if (iii) length of the rod AB is increased?

A particle is thrown upward with a velocity of 50m/sec .what will be the velocity at its highest point of the journey. How high the particle rise. What time would it taken to reach the highest point (g=10m/sec)

An empty density bottle weighs 22 g. When completely filled with water it weighs 50 g and when completely filled with brine solution it weighs 54 g. Calculate the density of the brine solution.

State which of the following situations are possible and give an example for each of these:(a) an object with a constant acceleration but with zero velocity.(b) an object moving with an acceleration but with uniform speed.