13232 + Interview Questions in Physics Page 5 InterviewSolution

201.	An alloy of gold and silver contains 38.5% sliver by mass and has a density of 14.6 g.mL-1 . What is the molar concentration of sliver in this alloy
Answer» An alloy of gold and silver contains 38.5% sliver by mass and has a density of 14.6 g.mL-1 . What is the molar concentration of sliver in this alloy

Discussion

202.	(a) Explain the principle of working of a hydroelectric power plant.(b) What is tidal energy? How can it be utilized?(c) State any two uses of solar cells.(d) Explain why, a solar cooker box is (i) painted black from inside, and (ii) covered with a glass sheet.(e) Give two reasons why Biogas is a good domestic fuel.
Answer» (a) Explain the principle of working of a hydroelectric power plant. (b) What is tidal energy? How can it be utilized? (c) State any two uses of solar cells. (d) Explain why, a solar cooker box is (i) painted black from inside, and (ii) covered with a glass sheet. (e) Give two reasons why Biogas is a good domestic fuel.

Discussion

203.	In an alpha decay, the atomic number of an element decreases by __.
Answer» In an alpha decay, the atomic number of an element decreases by __.

Discussion

204.	Can wr prove speed=distance/time mathematically? Or it can be proved with an experiment only?
Answer» Can wr prove speed=distance/time mathematically? Or it can be proved with an experiment only?

Discussion

205.	A ‘RADAR’ is able to detect the reflected waves from an enemy airplane aftera time interval of 3 x 10^-4 seconds. If the velocity of the wave is 3 x 10^8ms-1,calculate the distance of airplane from the radar.
Answer» A ‘RADAR’ is able to detect the reflected waves from an enemy airplane aftera time interval of 3 x 10^-4 seconds. If the velocity of the wave is 3 x 10^8ms-1,calculate the distance of airplane from the radar.

Discussion

206.	Four cars A, B, C and D are moving on a levelled, straight road. Their distance-time graphs are shown in the given figure. Which of the following is the correct statement regarding the motion of these cars ? (a) car A is faster than car D. (b) car B is the slowest (c) car D is faster than the car C (d) car C is the slowest
Answer» Four cars A, B, C and D are moving on a levelled, straight road. Their distance-time graphs are shown in the given figure. Which of the following is the correct statement regarding the motion of these cars ? (a) car A is faster than car D. (b) car B is the slowest (c) car D is faster than the car C (d) car C is the slowest

206.

Four cars A, B, C and D are moving on a levelled, straight road. Their distance-time graphs are shown in the given figure. Which of the following is the correct statement regarding the motion of these cars ? (a) car A is faster than car D. (b) car B is the slowest (c) car D is faster than the car C (d) car C is the slowest

Answer»

Four cars A, B, C and D are moving on a levelled, straight road. Their distance-time graphs are shown in the given figure. Which of the following is the correct statement regarding the motion of these cars ?

(a) car A is faster than car D.

(b) car B is the slowest

(c) car D is faster than the car C

(d) car C is the slowest

Discussion

207.	A light and a heavy object have the same momentum. Which one of the following statements is correct regarding the kinetic energy of these two objects?
Answer» A light and a heavy object have the same momentum. Which one of the following statements is correct regarding the kinetic energy of these two objects?

Discussion

208.	33.A particle moves along the parabolic path Y equal to 2 x minus x squared plus two in such a way that the X component of velocity vector remains constant 5 metre per second find the magnitude of acceleration of the particle
Answer» 33.A particle moves along the parabolic path Y equal to 2 x minus x squared plus two in such a way that the X component of velocity vector remains constant 5 metre per second find the magnitude of acceleration of the particle

Discussion

209.	Which characteristic of sound makes it possible to recognize a person by his voice without seeing him ?
Answer» Which characteristic of sound makes it possible to recognize a person by his voice without seeing him ?

Discussion

210.	A hockey ball of mass 200 g travelling at 10 m s−1 is struck by a hockey stick so as to return it along its original path with a velocity at 5 m s−1. Calculate the magnitude of change of momentum occurred in the motion of the hockey ball by the force applied by the hockey stick.
Answer» A hockey ball of mass 200 g travelling at 10 m s⁻¹ is struck by a hockey stick so as to return it along its original path with a velocity at 5 m s⁻¹. Calculate the magnitude of change of momentum occurred in the motion of the hockey ball by the force applied by the hockey stick.

Discussion

211.	What is a contact force?
Answer» What is a contact force?

Discussion

212.	The focal length of the mirror shown in figure is 20 cm. A point object at O is moving with velocity 5 mm/s making an angle of 37∘ with the principal axis as shown. Then, which of the following graphs correctly represents the position and direction of velocity of its image at this instant?
Answer» The focal length of the mirror shown in figure is $20 cm$ . A point object at $O$ is moving with velocity $5 mm/s$ making an angle of $37^{\circ}$ with the principal axis as shown. Then, which of the following graphs correctly represents the position and direction of velocity of its image at this instant?

Discussion

213.	A wooden block is floating in a bucket with 4/5th of its volume submerged in water. Now oil is poured over the block such that 1/2 the volume of block is submerged in water and the other half in oil. Find the density of oil wrt water
Answer» A wooden block is floating in a bucket with 4/5th of its volume submerged in water. Now oil is poured over the block such that 1/2 the volume of block is submerged in water and the other half in oil. Find the density of oil wrt water

Discussion

214.	what is the meaning of ionic velocity
Answer» what is the meaning of ionic velocity

Discussion

215.	A man walking with a speed of 3km/h finds the rain drops falling vertically downwards. When the man increases his s to 6km/h he finds that the rain drops are falling making an angle 30⁰ with the vertical. Find the speed of rain drops
Answer» A man walking with a speed of 3km/h finds the rain drops falling vertically downwards. When the man increases his s to 6km/h he finds that the rain drops are falling making an angle 30⁰ with the vertical. Find the speed of rain drops

Discussion

216.	Which of following is the duration for thiruvathira njattuvela?
Answer» Which of following is the duration for thiruvathira njattuvela?

Discussion

217.	The position of a particle along a straight line is given by s=(t^3 -9t^2+15t)m, where t is in seconds.(1) Velocity of the particle changes its directionfirst time at t =2 s(2) Velocity of particle changes its direction second time at t =3 s(3) The distance travelled by the particle in 0-6s is 46 m(4)The average velocity of the particle in 0-6s in -3ms^{-1}
Answer» The position of a particle along a straight line is given by s=(t^3 -9t^2+15t)m, where t is in seconds.(1) Velocity of the particle changes its directionfirst time at t =2 s(2) Velocity of particle changes its direction second time at t =3 s(3) The distance travelled by the particle in 0-6s is 46 m(4)The average velocity of the particle in 0-6s in -3ms^{-1}

Discussion

218.	An earthquake generally produces which type of sound wave before the main shock wave begins?
Answer» An earthquake generally produces which type of sound wave before the main shock wave begins?

Discussion

219.	An elevator, in which a man is standing, is moving upwards with a speed of 10m/s. If the man drops a coin from a height of 2.45 m from the floor of the elevator, it reaches the floor of the elevator after time (Take g=9.8m/s2)
Answer» An elevator, in which a man is standing, is moving upwards with a speed of $10 m / s .$ If the man drops a coin from a height of $2.45 m$ from the floor of the elevator, it reaches the floor of the elevator after time $(T a k e g = 9.8 m / s^{2})$

Discussion

220.	An object is placed at 60 cm from the pole of a concave mirror whose focal length is 20 cm. What is the image distance as per sign convention ?
Answer» An object is placed at $60 c m$ from the pole of a concave mirror whose focal length is $20 c m$ . What is the image distance as per sign convention ?

Discussion

221.	What is screw gauge and vernier calliper with a perfect diagram and explain it ?
Answer» What is screw gauge and vernier calliper with a perfect diagram and explain it ?

Discussion

222.	Two objects of masses 10 kg and 15 kg are moving in the same direction with different velocities 5 m/min and 10 m/min respectively. If they collide and stick together and move with a common velocity, then the magnitude of their common velocity is
Answer» Two objects of masses 10 kg and 15 kg are moving in the same direction with different velocities 5 m/min and 10 m/min respectively. If they collide and stick together and move with a common velocity, then the magnitude of their common velocity is

Discussion

223.	The time taken by car to reach 90 km/h from rest is 5 minutes. Calculate:(i) The acceleration of the car(ii) The distance covered by the car [5 MARKS]
Answer» The time taken by car to reach 90 km/h from rest is 5 minutes. Calculate: (i) The acceleration of the car (ii) The distance covered by the car [5 MARKS]

223.

The time taken by car to reach 90 km/h from rest is 5 minutes. Calculate:(i) The acceleration of the car(ii) The distance covered by the car [5 MARKS]

Answer»

The time taken by car to reach 90 km/h from rest is 5 minutes. Calculate:

(i) The acceleration of the car

(ii) The distance covered by the car [5 MARKS]

Discussion

224.	In the given system, if we change A1 into 2A1 , A2 into A22 and F1 into 10F1, then pressure at B piston changes from P to P0. Calculate the ratio of P and P0.
Answer» In the given system, if we change $A_{1}$ into $2 A_{1}$ , $A_{2}$ into $\frac{A_{2}}{2}$ and $F_{1}$ into $10 F_{1}$ , then pressure at B piston changes from $P$ to $P_{0}$ . Calculate the ratio of $P$ and $P_{0}$ .

Discussion

225.	An object of 400 g has volume of 200 cm3. The relative density of object is
Answer» An object of 400 g has volume of 200 cm³. The relative density of object is

Discussion

226.	If acceleration a = 3x^2, where x is position then velocity is proportional to: a) x^{1/2} b) x^2 c) x^3 d) x^{3/2
Answer» If acceleration a = 3x^2, where x is position then velocity is proportional to: a) x^{1/2} b) x^2 c) x^3 d) x^{3/2

Discussion

227.	Two balls lifted up to same height. If ball 1 has twice the weight compare to ball 2. What is the ratio of their Potential energies?
Answer» Two balls lifted up to same height. If ball 1 has twice the weight compare to ball 2. What is the ratio of their Potential energies?

Discussion

228.	A concave mirror forms a real image of a point source (S) lying on the optical axis at a distance of 50 cm from the mirror. The focal length of the mirror is 25 cm. The mirror is cut into two equal parts, and each half are drawn at a distance of 1 cm apart in a direction perpendicular to the optical axis. The distance between the two images formed by the two halves of the mirror will be
Answer» A concave mirror forms a real image of a point source $(S)$ lying on the optical axis at a distance of $50 cm$ from the mirror. The focal length of the mirror is $25 cm$ . The mirror is cut into two equal parts, and each half are drawn at a distance of $1 cm$ apart in a direction perpendicular to the optical axis. The distance between the two images formed by the two halves of the mirror will be

Discussion

229.	The rate of super-elevation for a horizontal curve of radius 400 m in a national highway for a design speed of 80 kmph is _______0.07
Answer» The rate of super-elevation for a horizontal curve of radius 400 m in a national highway for a design speed of 80 kmph is _______ 0.07

Discussion

230.	The period of moon's rotation around the earth is nearly 29 days. If moon's mass were 2 fold it's present value and all other things remain unchanged, the time period of revolution of the moon would be ( in days)??(a) 29 root 2(b) 29/root 2(c) 29 root 3(d) 29
Answer» The period of moon's rotation around the earth is nearly 29 days. If moon's mass were 2 fold it's present value and all other things remain unchanged, the time period of revolution of the moon would be ( in days)?? (a) 29 root 2 (b) 29/root 2 (c) 29 root 3 (d) 29

Discussion

231.	If the displacement of a particle varies with time as √x=t+7 then1) velocity of the particle is inversely proportional to t2) velocity of the particle is proportional to t^2 3) velocity of the particle is proportional to√t 4) the particle moves with constant acceleration
Answer» If the displacement of a particle varies with time as √x=t+7 then 1) velocity of the particle is inversely proportional to t 2) velocity of the particle is proportional to t^2 3) velocity of the particle is proportional to√t 4) the particle moves with constant acceleration

Discussion

232.	How is sound produced in a flute?
Answer» How is sound produced in a flute?

Discussion

233.	(v) Even if a physical quantity depends on three Physical quantities, out of which two have the same dimensions, the formula cannot be derived by method of dimensions. explain.
Answer» (v) Even if a physical quantity depends on three Physical quantities, out of which two have the same dimensions, the formula cannot be derived by method of dimensions. explain.

Discussion

234.	In the experiment on finding the equivalent resistance of two resistors, connected in parallel, three students connected the voltmeter in their circuits, in the three ways X, Y and Z shown here.The voltmeter has been correctly connected in(1) cases X and Y only(2) cases Y and Z only(3) cases Z and X only(4) all the three cases
Answer» In the experiment on finding the equivalent resistance of two resistors, connected in parallel, three students connected the voltmeter in their circuits, in the three ways X, Y and Z shown here. The voltmeter has been correctly connected in (1) cases X and Y only (2) cases Y and Z only (3) cases Z and X only (4) all the three cases

Discussion

235.	A gun is fitted on platform moving with velocity.10/m/s. A bullet is fired from the gun withR29.muzzle velocity V2=(40i+20j) m/s with respectto the platform. Then the horizontal range ofprojectile is(2) 400 m(1) 100 m(3) 200 m(4) 300 m
Answer» A gun is fitted on platform moving with velocity.10/m/s. A bullet is fired from the gun withR29.muzzle velocity V2=(40i+20j) m/s with respectto the platform. Then the horizontal range ofprojectile is(2) 400 m(1) 100 m(3) 200 m(4) 300 m

Discussion

236.	Differentiate between universal gravitational constant and acceleration due to gravity. ( G & g ) P.S. Please write the differences in a table ( in paper)
Answer» Differentiate between universal gravitational constant and acceleration due to gravity. ( G & g ) P.S. Please write the differences in a table ( in paper)

Discussion

237.	When a force of constant magnitude and a fixeddirection acts on a moving object, then its path is(1) Circular(3) Straight line(2) Parabolic(4) Either (2) or (3)
Answer» When a force of constant magnitude and a fixeddirection acts on a moving object, then its path is(1) Circular(3) Straight line(2) Parabolic(4) Either (2) or (3)

Discussion

238.	A constant retarding force of 50 N is applied to abody of mass 20 kg moving initially with a speedof 15 m/s-. How long does the body take to stop.(2)8 s(1) 6 s(4) 10 s(3) 9 s
Answer» A constant retarding force of 50 N is applied to abody of mass 20 kg moving initially with a speedof 15 m/s-. How long does the body take to stop.(2)8 s(1) 6 s(4) 10 s(3) 9 s

Discussion

239.	What are the ammeter (A) and voltmeter (V) readings in the circuit?
Answer» What are the ammeter (A) and voltmeter (V) readings in the circuit?

239.

What are the ammeter (A) and voltmeter (V) readings in the circuit?

Answer»

What are the ammeter (A) and voltmeter (V) readings in the circuit?

Discussion

240.	Give scientific reasons:(1) It is advised to tie any luggage kept on the roof of the bus with a rope.(2) Action and reaction forces do not cancel each other even though they have equal magnitude and opposite directions.(3) It is easy to stop a tennis ball than a cricket ball moving with the same velocity.
Answer» Give scientific reasons: (1) It is advised to tie any luggage kept on the roof of the bus with a rope. (2) Action and reaction forces do not cancel each other even though they have equal magnitude and opposite directions. (3) It is easy to stop a tennis ball than a cricket ball moving with the same velocity.

240.

Give scientific reasons:(1) It is advised to tie any luggage kept on the roof of the bus with a rope.(2) Action and reaction forces do not cancel each other even though they have equal magnitude and opposite directions.(3) It is easy to stop a tennis ball than a cricket ball moving with the same velocity.

Answer»

Give scientific reasons:

(1) It is advised to tie any luggage kept on the roof of the bus with a rope.

(2) Action and reaction forces do not cancel each other even though they have equal magnitude and opposite directions.

(3) It is easy to stop a tennis ball than a cricket ball moving with the same velocity.

Discussion

241.	a 5kg block is accelerate by 2m/s then force on block.
Answer» a 5kg block is accelerate by 2m/s then force on block.

Discussion

242.	Give scientific reasonsa. The construction of turbine is different for different types of power plants.b. It is absolutely necessary to control the fission reaction in nuclear power plants.c. Hydroelectric energy, solar energy and wind energy are called renewable energies.d. It is possible to produce energy from mW to MW using solar photovoltaic cells.
Answer» Give scientific reasons a. The construction of turbine is different for different types of power plants. b. It is absolutely necessary to control the fission reaction in nuclear power plants. c. Hydroelectric energy, solar energy and wind energy are called renewable energies. d. It is possible to produce energy from mW to MW using solar photovoltaic cells.

Discussion

243.	For dipole-induced dipole forces, interaction energy is:
Answer» For dipole-induced dipole forces, interaction energy is:

Discussion

244.	39.The density of neon will be highest at which of them and how? Options: STP 0^° C and 2 atm 273^° C and 1 atm 273^° C and 2 atm
Answer» 39.The density of neon will be highest at which of them and how? Options: STP 0^° C and 2 atm 273^° C and 1 atm 273^° C and 2 atm

Discussion

245.	all about resolution and wavelength relationship
Answer» all about resolution and wavelength relationship

Discussion

246.	A body of mass 3 kg is dropped from a height of 1m. The K.E of the body before touching the ground is: ......
Answer» A body of mass 3 kg is dropped from a height of 1m. The K.E of the body before touching the ground is: ......

Discussion

247.	What do the following indicate in a barometer regarding weather : (a) gradual fall in the mercury level, (b) sudden fall in the mercury level, (c) gradual rise in the mercury level ?
Answer» What do the following indicate in a barometer regarding weather : (a) gradual fall in the mercury level, (b) sudden fall in the mercury level, (c) gradual rise in the mercury level ?

Discussion

248.	The branch of physics which deal with the motion of objects while taking into consideration the cause of motion is:
Answer» The branch of physics which deal with the motion of objects while taking into consideration the cause of motion is:

Discussion

249.	A body has an initial velocity of 4m/s and deceleration of 4m/s2, then what is its final velocity after travelling 2m?
Answer» A body has an initial velocity of 4m/s and deceleration of 4m/s², then what is its final velocity after travelling 2m?

Discussion

250.	A ball is dropped from the top of a building. Which among the following is not a graph of motion of the ball?
Answer» A ball is dropped from the top of a building. Which among the following is not a graph of motion of the ball?

Discussion

Explore topic-wise InterviewSolutions in .

An alloy of gold and silver contains 38.5% sliver by mass and has a density of 14.6 g.mL-1 . What is the molar concentration of sliver in this alloy

In an alpha decay, the atomic number of an element decreases by __.

Can wr prove speed=distance/time mathematically? Or it can be proved with an experiment only?

A ‘RADAR’ is able to detect the reflected waves from an enemy airplane aftera time interval of 3 x 10^-4 seconds. If the velocity of the wave is 3 x 10^8ms-1,calculate the distance of airplane from the radar.

A light and a heavy object have the same momentum. Which one of the following statements is correct regarding the kinetic energy of these two objects?

33.A particle moves along the parabolic path Y equal to 2 x minus x squared plus two in such a way that the X component of velocity vector remains constant 5 metre per second find the magnitude of acceleration of the particle

Which characteristic of sound makes it possible to recognize a person by his voice without seeing him ?

A hockey ball of mass 200 g travelling at 10 m s−1 is struck by a hockey stick so as to return it along its original path with a velocity at 5 m s−1. Calculate the magnitude of change of momentum occurred in the motion of the hockey ball by the force applied by the hockey stick.

What is a contact force?

The focal length of the mirror shown in figure is 20 cm. A point object at O is moving with velocity 5 mm/s making an angle of 37∘ with the principal axis as shown. Then, which of the following graphs correctly represents the position and direction of velocity of its image at this instant?

A wooden block is floating in a bucket with 4/5th of its volume submerged in water. Now oil is poured over the block such that 1/2 the volume of block is submerged in water and the other half in oil. Find the density of oil wrt water

what is the meaning of ionic velocity

A man walking with a speed of 3km/h finds the rain drops falling vertically downwards. When the man increases his s to 6km/h he finds that the rain drops are falling making an angle 30⁰ with the vertical. Find the speed of rain drops

Which of following is the duration for thiruvathira njattuvela?

An earthquake generally produces which type of sound wave before the main shock wave begins?

An elevator, in which a man is standing, is moving upwards with a speed of 10m/s. If the man drops a coin from a height of 2.45 m from the floor of the elevator, it reaches the floor of the elevator after time (Take g=9.8m/s2)

An object is placed at 60 cm from the pole of a concave mirror whose focal length is 20 cm. What is the image distance as per sign convention ?

What is screw gauge and vernier calliper with a perfect diagram and explain it ?

Two objects of masses 10 kg and 15 kg are moving in the same direction with different velocities 5 m/min and 10 m/min respectively. If they collide and stick together and move with a common velocity, then the magnitude of their common velocity is

The time taken by car to reach 90 km/h from rest is 5 minutes. Calculate:(i) The acceleration of the car(ii) The distance covered by the car [5 MARKS]

In the given system, if we change A1 into 2A1 , A2 into A22 and F1 into 10F1, then pressure at B piston changes from P to P0. Calculate the ratio of P and P0.

An object of 400 g has volume of 200 cm3. The relative density of object is

If acceleration a = 3x^2, where x is position then velocity is proportional to: a) x^{1/2} b) x^2 c) x^3 d) x^{3/2

Two balls lifted up to same height. If ball 1 has twice the weight compare to ball 2. What is the ratio of their Potential energies?

The rate of super-elevation for a horizontal curve of radius 400 m in a national highway for a design speed of 80 kmph is _______0.07

The period of moon's rotation around the earth is nearly 29 days. If moon's mass were 2 fold it's present value and all other things remain unchanged, the time period of revolution of the moon would be ( in days)??(a) 29 root 2(b) 29/root 2(c) 29 root 3(d) 29

If the displacement of a particle varies with time as √x=t+7 then1) velocity of the particle is inversely proportional to t2) velocity of the particle is proportional to t^2 3) velocity of the particle is proportional to√t 4) the particle moves with constant acceleration

How is sound produced in a flute?

(v) Even if a physical quantity depends on three Physical quantities, out of which two have the same dimensions, the formula cannot be derived by method of dimensions. explain.

A gun is fitted on platform moving with velocity.10/m/s. A bullet is fired from the gun withR29.muzzle velocity V2=(40i+20j) m/s with respectto the platform. Then the horizontal range ofprojectile is(2) 400 m(1) 100 m(3) 200 m(4) 300 m

Differentiate between universal gravitational constant and acceleration due to gravity. ( G & g ) P.S. Please write the differences in a table ( in paper)

When a force of constant magnitude and a fixeddirection acts on a moving object, then its path is(1) Circular(3) Straight line(2) Parabolic(4) Either (2) or (3)

A constant retarding force of 50 N is applied to abody of mass 20 kg moving initially with a speedof 15 m/s-. How long does the body take to stop.(2)8 s(1) 6 s(4) 10 s(3) 9 s

What are the ammeter (A) and voltmeter (V) readings in the circuit?

a 5kg block is accelerate by 2m/s then force on block.

For dipole-induced dipole forces, interaction energy is:

39.The density of neon will be highest at which of them and how? Options: STP 0^° C and 2 atm 273^° C and 1 atm 273^° C and 2 atm

all about resolution and wavelength relationship

A body of mass 3 kg is dropped from a height of 1m. The K.E of the body before touching the ground is: ......

What do the following indicate in a barometer regarding weather : (a) gradual fall in the mercury level, (b) sudden fall in the mercury level, (c) gradual rise in the mercury level ?

The branch of physics which deal with the motion of objects while taking into consideration the cause of motion is:

A body has an initial velocity of 4m/s and deceleration of 4m/s​​​​​​2​​​​​, then what is its final velocity after travelling 2m?

A ball is dropped from the top of a building. Which among the following is not a graph of motion of the ball?

A body has an initial velocity of 4m/s and deceleration of 4m/s2, then what is its final velocity after travelling 2m?