13232 + Interview Questions in Physics Page 10 InterviewSolution

451.	what exactly is magnet ? what makes it to crate magnetic field ? is to do anything with electrons ? what exactly happening at the molecular level ?
Answer» what exactly is magnet ? what makes it to crate magnetic field ? is to do anything with electrons ? what exactly happening at the molecular level ?

Discussion

452.	Newton's second law
Answer» Newton's second law

Discussion

453.	A wave of frequency 500Hz has velocity of 360m/s. Find the distance between two nearest points 60° out of phase
Answer» A wave of frequency 500Hz has velocity of 360m/s. Find the distance between two nearest points 60° out of phase

Discussion

454.	A man started his journey on his car from location a and came back. The graph given below shows his position at different times during the whole journey.Study the above graph carefully and answer the questions given below:(i) At what time did he start and end his journey?(ii) What was the total duration of the journey?(iii) Which journey, onward or return, was of longer duration?(iv) For how many hours did he not move?(v) At what time did he have the fastest speed?
Answer» A man started his journey on his car from location a and came back. The graph given below shows his position at different times during the whole journey. Study the above graph carefully and answer the questions given below: (i) At what time did he start and end his journey? (ii) What was the total duration of the journey? (iii) Which journey, onward or return, was of longer duration? (iv) For how many hours did he not move? (v) At what time did he have the fastest speed?

Discussion

455.	The refractive index of a certain glass is 1.5 for light whose wavelength in vacuum is 6000 Å. The wavelength of this light when it passes through glass is
Answer» The refractive index of a certain glass is $1.5$ for light whose wavelength in vacuum is $6000 Å$ . The wavelength of this light when it passes through glass is

Discussion

456.	A boy is hanging from a horizontal branch of tree .the tension in the arms will be maximum when the angle between the arms is
Answer» A boy is hanging from a horizontal branch of tree .the tension in the arms will be maximum when the angle between the arms is

Discussion

457.	Name the physical quantity whose SI unit is Newton
Answer» Name the physical quantity whose SI unit is Newton

Discussion

458.	A bubble of gas released at the bottom of a lake increases to 4 times its original vol. when it reaches the surface.Assuming that atmospheric pressure is equivalent to the pressure ecerted by a column of water 10m high , what is the depth of the lake ?
Answer» A bubble of gas released at the bottom of a lake increases to 4 times its original vol. when it reaches the surface.Assuming that atmospheric pressure is equivalent to the pressure ecerted by a column of water 10m high , what is the depth of the lake ?

Discussion

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

Discussion

460.	A body of mas 1 kg is kept at rest. A constant force of 6N starts acting on it. Find the time taken by the body to move through a distance of 12m.
Answer» A body of mas 1 kg is kept at rest. A constant force of 6N starts acting on it. Find the time taken by the body to move through a distance of 12m.

Discussion

461.	Which of the following graphs shows that the body is at rest?
Answer» Which of the following graphs shows that the body is at rest?

461.

Which of the following graphs shows that the body is at rest?

Answer»

Which of the following graphs shows that the body is at rest?

Discussion

462.	Question 8Which of the following statements is true?(a) A convex lens has 4 dioptre power having a focal length 0.25 m.(b) A convex lens has -4 dioptre power having a focal length -0.25 m. (c) A concave lens has 4 dioptre power having a focal length 0.25 m. (d) A concave lens has 4 dioptre power having a focal length -0.25 m.
Answer» Question 8 Which of the following statements is true? (a) A convex lens has 4 dioptre power having a focal length 0.25 m. (b) A convex lens has -4 dioptre power having a focal length -0.25 m. (c) A concave lens has 4 dioptre power having a focal length 0.25 m. (d) A concave lens has 4 dioptre power having a focal length -0.25 m.

Discussion

463.	What is the force of 1 N acting over an area of 1 m2 called?
Answer» What is the force of 1 N acting over an area of 1 m² called?

Discussion

464.	The ratio of relative strength of electromagnetic force to the weak nuclear force is ?
Answer» The ratio of relative strength of electromagnetic force to the weak nuclear force is ?

Discussion

465.	There are 9 letters in the word: PROXIMITY. How many letters of this word won't undergoe lateral inversion in a plane mirror?
Answer» There are 9 letters in the word: PROXIMITY. How many letters of this word won't undergoe lateral inversion in a plane mirror?

Discussion

466.	What is the difference between contact and uncontact force
Answer» What is the difference between contact and uncontact force

Discussion

467.	A sphere of radius R/2 is taken out from a solid sphere of radius R leaving a spherical cavity.A gentle push is given to this sphere.Show that the motion of the sphere is ShM
Answer» A sphere of radius R/2 is taken out from a solid sphere of radius R leaving a spherical cavity.A gentle push is given to this sphere.Show that the motion of the sphere is ShM

Discussion

468.	Calculate the resistance of a copper wire of length 1m and area of cross section 2 m m². Resistivity of copper wire is 1.7 × 10‐⁸ ohm-m
Answer» Calculate the resistance of a copper wire of length 1m and area of cross section 2 m m². Resistivity of copper wire is 1.7 × 10‐⁸ ohm-m

Discussion

469.	How can Scalar Quantity and Vector Quantity be defined ?
Answer» How can Scalar Quantity and Vector Quantity be defined ?

Discussion

470.	For verifying the laws of reflection of sound, a student has to choose from :(i) a black polished metal sheet or a white thermocol sheet.(ii) a 0.5 m long tube of diameter 3 cm or a 1.5 m long tube of diameter 20 cmHe should prefer to choose the :(1) metal sheet and the 0.5 m long tube(2) metal sheet and the 1.5 m long tube(3) thermocol sheet and the 0.5 m long tube(4) thermocol sheet and the 1.5 m long tube
Answer» For verifying the laws of reflection of sound, a student has to choose from : (i) a black polished metal sheet or a white thermocol sheet. (ii) a 0.5 m long tube of diameter 3 cm or a 1.5 m long tube of diameter 20 cm He should prefer to choose the : (1) metal sheet and the 0.5 m long tube (2) metal sheet and the 1.5 m long tube (3) thermocol sheet and the 0.5 m long tube (4) thermocol sheet and the 1.5 m long tube

Discussion

471.	Take a small cotton ball and place it in a tumbler/bowl filled with water. Observe it for at least 10 minutes. Will it float or sink in water and why?
Answer» Take a small cotton ball and place it in a tumbler/bowl filled with water. Observe it for at least 10 minutes. Will it float or sink in water and why?

Discussion

472.	Question 1 (b) The following is the distance-time table of an object in motion: Time in secondsDistance in metres001128327464512562167343 (b) What do you infer about the forces acting on the object?
Answer» Question 1 (b) The following is the distance-time table of an object in motion: $\begin{matrix} T i m e i n s e c o n d s & D i s t a n c e i n m e t r e s 0 & 0 1 & 1 2 & 8 3 & 27 4 & 64 5 & 125 6 & 216 7 & 343 \end{matrix}$ (b) What do you infer about the forces acting on the object?

Discussion

473.	The cooler areas on the surface of the sun are called
Answer» The cooler areas on the surface of the sun are called

Discussion

474.	Which of the following substances has the highest specific heat capacity?
Answer» Which of the following substances has the highest specific heat capacity?

Discussion

475.	The area of cross-section of a large tank is 0.5 m2. It has an opening near bottom having area of cross-section 1 cm2. A load of 20 kg is applied on the water at the top. Find the velocity of the water coming out of the opening at the time when the height of water level is 50 cm above the bottom. (Take g=10 m/s2)
Answer» The area of cross-section of a large tank is $0.5 m^{2}$ . It has an opening near bottom having area of cross-section $1 {cm}^{2}$ . A load of $20 kg$ is applied on the water at the top. Find the velocity of the water coming out of the opening at the time when the height of water level is $50 cm$ above the bottom. (Take $g = 10 {m/s}^{2}$ )

Discussion

476.	what is keplers law of planetory motio
Answer» what is keplers law of planetory motio

Discussion

477.	The bulb in the circuit shown below does not glow.Which of the following labelled part is responsible for this?
Answer» The bulb in the circuit shown below does not glow. Which of the following labelled part is responsible for this?

Discussion

478.	Explain pascal's law.
Answer» Explain pascal's law.

Discussion

479.	Motion of a motorcyclist is shown in the figure. Which of the following shows the distance-time graph for this motion?
Answer» Motion of a motorcyclist is shown in the figure. Which of the following shows the distance-time graph for this motion?

Discussion

480.	At a depth of 2 km in an ocean, what is force acting on a window of area 25 cm×20 cm of a submarine at this depth, the interior of which is kept at sea level atmospheric pressure? (The density of sea water is 1030 kg m–3, g=10 m/s2)
Answer» At a depth of $2 km$ in an ocean, what is force acting on a window of area $25 cm \times 20 cm$ of a submarine at this depth, the interior of which is kept at sea level atmospheric pressure? (The density of sea water is $1030 {kg m}^{- 3}, g = 10 {m/s}^{2})$

Discussion

481.	Steam at 100oC is passed into 1.1 kg of water contained in a calorimeter of water equivalent 0.02 kg at 15oC till the temperature of the calorimeter and its contents rises to 80oC. The mass of the steam condensed in kg is Specific heat of water = 1 kcal/kg∘C, Latent heat of Vaporisation = 540 kcal/kg
Answer» Steam at $100^{o} C$ is passed into 1.1 kg of water contained in a calorimeter of water equivalent 0.02 kg at $15^{o} C$ till the temperature of the calorimeter and its contents rises to $80^{o} C .$ The mass of the steam condensed in kg is Specific heat of water = $1 k c a l / k g^{\circ} C$ , Latent heat of Vaporisation = $540 k c a l / k g$

481.

Steam at 100oC is passed into 1.1 kg of water contained in a calorimeter of water equivalent 0.02 kg at 15oC till the temperature of the calorimeter and its contents rises to 80oC. The mass of the steam condensed in kg is Specific heat of water = 1 kcal/kg∘C, Latent heat of Vaporisation = 540 kcal/kg

Answer»

Steam at $100^{o} C$ is passed into 1.1 kg of water contained in a calorimeter of water equivalent 0.02 kg at $15^{o} C$ till the temperature of the calorimeter and its contents rises to $80^{o} C .$ The mass of the steam condensed in kg is

Specific heat of water = $1 k c a l / k g^{\circ} C$ , Latent heat of Vaporisation = $540 k c a l / k g$

Discussion

482.	The velocities of two bodies (masses 5kg and 10kg) in the +x and the+y directions are 4m/s and 2m/s respectively .they collide and stick together. what is the final velocity?
Answer» The velocities of two bodies (masses 5kg and 10kg) in the +x and the+y directions are 4m/s and 2m/s respectively .they collide and stick together. what is the final velocity?

Discussion

483.	How far away is the cliff from the child, if a child hears an echo from a cliff 6 second after the sound produced by powerful horn? The velocity sound in air at 22oC is 344 m/s.
Answer» How far away is the cliff from the child, if a child hears an echo from a cliff 6 second after the sound produced by powerful horn? The velocity sound in air at 22^oC is 344 m/s.

Discussion

484.	47.How far should an object be from the pole of concave mirror of focal length 20cm to form a real image whose magnification is 1/5 th of the size of the object?
Answer» 47.How far should an object be from the pole of concave mirror of focal length 20cm to form a real image whose magnification is 1/5 th of the size of the object?

Discussion

485.	What is average speed and what is average velocity and what is instantaneous speed and what do you mean by acceleration
Answer» What is average speed and what is average velocity and what is instantaneous speed and what do you mean by acceleration

Discussion

486.	30. Internal forces acting with in a system is particles can alter 1) The linear momentum as well as the kinetic energy of the system 2) The linear momentum of the system, but not the kinetic energy of the system 3) The kinetic energy of the system, but not the linear momentum of the system 4)Neither linear momentum nor kinetic energy of the system
Answer» 30. Internal forces acting with in a system is particles can alter 1) The linear momentum as well as the kinetic energy of the system 2) The linear momentum of the system, but not the kinetic energy of the system 3) The kinetic energy of the system, but not the linear momentum of the system 4)Neither linear momentum nor kinetic energy of the system

Discussion

487.	a) What is hypermetropia. State the two causes?With the help of labelled ray diagram show:b) Eye defectc) Correction of Hypermetropia [5 MARKS]
Answer» a) What is hypermetropia. State the two causes? With the help of labelled ray diagram show: b) Eye defect c) Correction of Hypermetropia [5 MARKS]

Discussion

488.	When a body's weight is greater than the Buoyant force, the body sinks with an acceleration equal to _____
Answer» When a body's weight is greater than the Buoyant force, the body sinks with an acceleration equal to _____

Discussion

489.	A cord has original length of 100 cm is pulled by a force. The change in length of the cord is 2 mm. Determine the strain.
Answer» A cord has original length of 100 cm is pulled by a force. The change in length of the cord is 2 mm. Determine the strain.

Discussion

490.	The drawing shows a ship 800 m from a cliff. A gun is fired on the ship. After 5 seconds the people at the front of the ship hear the sound of the gun again. (a) What is the name of this effect ? (b) What happens to the sound at the cliff ? (c) How far does the sound travel in 5 seconds ? (d) Calculate the speed of sound.
Answer» The drawing shows a ship 800 m from a cliff. A gun is fired on the ship. After 5 seconds the people at the front of the ship hear the sound of the gun again. (a) What is the name of this effect ? (b) What happens to the sound at the cliff ? (c) How far does the sound travel in 5 seconds ? (d) Calculate the speed of sound.

490.

The drawing shows a ship 800 m from a cliff. A gun is fired on the ship. After 5 seconds the people at the front of the ship hear the sound of the gun again. (a) What is the name of this effect ? (b) What happens to the sound at the cliff ? (c) How far does the sound travel in 5 seconds ? (d) Calculate the speed of sound.

Answer»

The drawing shows a ship 800 m from a cliff. A gun is fired on the ship. After 5 seconds the people at the front of the ship hear the sound of the gun again.

(a) What is the name of this effect ?

(b) What happens to the sound at the cliff ?

(c) How far does the sound travel in 5 seconds ?

(d) Calculate the speed of sound.

Discussion

491.	A body moving with 20m/s turns by 60° and continues with 20m/s.Find change in velocity
Answer» A body moving with 20m/s turns by 60° and continues with 20m/s.Find change in velocity

Discussion

492.	A clutch has outer and inner diameter 100 mm and 40 mm respectively. Assuming a uniform pressure of 2 MPa and coefficient of friction of the material is 0.4, the torque carrying capacity of the clutch is
Answer» A clutch has outer and inner diameter $100 m m$ and $40 m m$ respectively. Assuming a uniform pressure of $2 M P a$ and coefficient of friction of the material is $0.4$ , the torque carrying capacity of the clutch is

Discussion

493.	Particles A and B are free to move along parallel paths. Particle B is moving at a constant velocity of 10 m/s and particle A starts ( from rest) moving at the moment particle B passes it. If particle A accelerates at 1 m/s^2 for 5 seconds and then travels at a constant velocity, the distance between particles A and B 10 seconds after particle B passes particle A is
Answer» Particles A and B are free to move along parallel paths. Particle B is moving at a constant velocity of 10 m/s and particle A starts ( from rest) moving at the moment particle B passes it. If particle A accelerates at 1 m/s^2 for 5 seconds and then travels at a constant velocity, the distance between particles A and B 10 seconds after particle B passes particle A is

Discussion

494.	Which of the following is not a correct use of the sea diving suit? To maintain body temperature. To resist external pressure. To decrease the buoyant force. To facilitate oxygen supply.
Answer» Which of the following is not a correct use of the sea diving suit? To maintain body temperature. To resist external pressure. To decrease the buoyant force. To facilitate oxygen supply.

Discussion

495.	Two bodies A and B do a work of 20s and 40s, respectively. What is the ratio of the power supplied by the two bodies?
Answer» Two bodies $A$ and $B$ do a work of $20 s$ and $40 s$ , respectively. What is the ratio of the power supplied by the two bodies?

Discussion

496.	A ship on the surface of water sends a signal and receives it back from a submarine inside water after 4 s. Calculate the distance of the submarine from the ship. (The speed of sound in water is 1450 m s−1).
Answer» A ship on the surface of water sends a signal and receives it back from a submarine inside water after 4 s. Calculate the distance of the submarine from the ship. (The speed of sound in water is 1450 m $s^{- 1}$ ).

Discussion

497.	Two charges with medium in between exert equal forces. Why?
Answer» Two charges with medium in between exert equal forces. Why?

Discussion

498.	36.A battery of emf2.0volt and internal resistance 0.1ohm is being charged with a current of 5.0A what is the potential difference between the terminals of a battery
Answer» 36.A battery of emf2.0volt and internal resistance 0.1ohm is being charged with a current of 5.0A what is the potential difference between the terminals of a battery

Discussion

499.	Why does ice not deposit in the freezer of a refrigerator equipped with defrosting technique. Explain
Answer» Why does ice not deposit in the freezer of a refrigerator equipped with defrosting technique. Explain

Discussion

500.	A construction worker’s helmet slips and falls down when he is 78.4m above the ground. He hears the sound of the helmet hitting the ground 4.23 seconds after it has slipped. Find the speed of sound in air. ( Accelaration due to gravity 9.8m/s2 )
Answer» A construction worker’s helmet slips and falls down when he is 78.4m above the ground. He hears the sound of the helmet hitting the ground 4.23 seconds after it has slipped. Find the speed of sound in air. ( Accelaration due to gravity $9.8 m / s^{2}$ )

Discussion

Explore topic-wise InterviewSolutions in .

what exactly is magnet ? what makes it to crate magnetic field ? is to do anything with electrons ? what exactly happening at the molecular level ?

Newton's second law

A wave of frequency 500Hz has velocity of 360m/s. Find the distance between two nearest points 60° out of phase

The refractive index of a certain glass is 1.5 for light whose wavelength in vacuum is 6000 Å. The wavelength of this light when it passes through glass is

A boy is hanging from a horizontal branch of tree .the tension in the arms will be maximum when the angle between the arms is

Name the physical quantity whose SI unit is Newton

A bubble of gas released at the bottom of a lake increases to 4 times its original vol. when it reaches the surface.Assuming that atmospheric pressure is equivalent to the pressure ecerted by a column of water 10m high , what is the depth of the lake ?

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

A body of mas 1 kg is kept at rest. A constant force of 6N starts acting on it. Find the time taken by the body to move through a distance of 12m.

Which of the following graphs shows that the body is at rest?

What is the force of 1 N acting over an area of 1 m2 called?

The ratio of relative strength of electromagnetic force to the weak nuclear force is ?

There are 9 letters in the word: PROXIMITY. How many letters of this word won't undergoe lateral inversion in a plane mirror?

What is the difference between contact and uncontact force

A sphere of radius R/2 is taken out from a solid sphere of radius R leaving a spherical cavity.A gentle push is given to this sphere.Show that the motion of the sphere is ShM

Calculate the resistance of a copper wire of length 1m and area of cross section 2 m m². Resistivity of copper wire is 1.7 × 10‐⁸ ohm-m

How can Scalar Quantity and Vector Quantity be defined ?

Take a small cotton ball and place it in a tumbler/bowl filled with water. Observe it for at least 10 minutes. Will it float or sink in water and why?​

Question 1 (b) The following is the distance-time table of an object in motion: Time in secondsDistance in metres001128327464512562167343 (b) What do you infer about the forces acting on the object?

The cooler areas on the surface of the sun are called

Which of the following substances has the highest specific heat capacity?

what is keplers law of planetory motio

The bulb in the circuit shown below does not glow.Which of the following labelled part is responsible for this?

Explain pascal's law.

Motion of a motorcyclist is shown in the figure. Which of the following shows the distance-time graph for this motion?

At a depth of 2 km in an ocean, what is force acting on a window of area 25 cm×20 cm of a submarine at this depth, the interior of which is kept at sea level atmospheric pressure? (The density of sea water is 1030 kg m–3, g=10 m/s2)

The velocities of two bodies (masses 5kg and 10kg) in the +x and the+y directions are 4m/s and 2m/s respectively .they collide and stick together. what is the final velocity?

How far away is the cliff from the child, if a child hears an echo from a cliff 6 second after the sound produced by powerful horn? The velocity sound in air at 22oC is 344 m/s.

47.How far should an object be from the pole of concave mirror of focal length 20cm to form a real image whose magnification is 1/5 th of the size of the object?

What is average speed and what is average velocity and what is instantaneous speed and what do you mean by acceleration

a) What is hypermetropia. State the two causes?With the help of labelled ray diagram show:b) Eye defectc) Correction of Hypermetropia [5 MARKS]

When a body's weight is greater than the Buoyant force, the body sinks with an acceleration equal to _____

A cord has original length of 100 cm is pulled by a force. The change in length of the cord is 2 mm. Determine the strain.

A body moving with 20m/s turns by 60° and continues with 20m/s.Find change in velocity

A clutch has outer and inner diameter 100 mm and 40 mm respectively. Assuming a uniform pressure of 2 MPa and coefficient of friction of the material is 0.4, the torque carrying capacity of the clutch is

Which of the following is not a correct use of the sea diving suit? To maintain body temperature. To resist external pressure. To decrease the buoyant force. To facilitate oxygen supply.

Two bodies A and B do a work of 20s and 40s, respectively. What is the ratio of the power supplied by the two bodies?

A ship on the surface of water sends a signal and receives it back from a submarine inside water after 4 s. Calculate the distance of the submarine from the ship. (The speed of sound in water is 1450 m s−1).

Two charges with medium in between exert equal forces. Why?

36.A battery of emf2.0volt and internal resistance 0.1ohm is being charged with a current of 5.0A what is the potential difference between the terminals of a battery

Why does ice not deposit in the freezer of a refrigerator equipped with defrosting technique. Explain

A construction worker’s helmet slips and falls down when he is 78.4m above the ground. He hears the sound of the helmet hitting the ground 4.23 seconds after it has slipped. Find the speed of sound in air. ( Accelaration due to gravity 9.8m/s2 )

Take a small cotton ball and place it in a tumbler/bowl filled with water. Observe it for at least 10 minutes. Will it float or sink in water and why?