13232 + Interview Questions in Physics Page 75 InterviewSolution

3701.	An object is fall freely from a height of 70 m. If the mass of an object is 4 kg. Find the kinetic energy before it strikes the ground.
Answer» An object is fall freely from a height of 70 m. If the mass of an object is 4 kg. Find the kinetic energy before it strikes the ground.

Discussion

3702.	Find the current in the given circuit
Answer» Find the current in the given circuit

Discussion

3703.	Two cars, laferrari and McLaren P1 are having a competition for highest speed. Laferrari can accelerate with 20m/xxx till 5seca and MacLean with 17m/xxx up to 6 seconds. Who wins.
Answer» Two cars, laferrari and McLaren P1 are having a competition for highest speed. Laferrari can accelerate with 20m/xxx till 5seca and MacLean with 17m/xxx up to 6 seconds. Who wins.

Discussion

3704.	Find the time required for a 50Hz AC to change its value from zero to rms value.
Answer» Find the time required for a 50Hz AC to change its value from zero to rms value.

Discussion

3705.	Reflection of sound is called:
Answer» Reflection of sound is called:

Discussion

3706.	A ball is thrown from 9th floor of a building with initial speed of 10 ms-1 at an angle of 60° to vertical. It reaches, the base of building in 3 second. The maximum height reached the ball above the base level is(1) 28. 5 m13 31.25 m(2) 38.5 m(4)32.5 m
Answer» A ball is thrown from 9th floor of a building with initial speed of 10 ms-1 at an angle of 60° to vertical. It reaches, the base of building in 3 second. The maximum height reached the ball above the base level is (1) 28. 5 m 13 31.25 m (2) 38.5 m (4)32.5 m

Discussion

3707.	Question 71(iv)The following graph shows the journey made by two cyclists, one from town A to B and the other from town B to A.How far had cyclist II travelled when he met cyclist I?
Answer» Question 71(iv) The following graph shows the journey made by two cyclists, one from town A to B and the other from town B to A. How far had cyclist II travelled when he met cyclist I?

Discussion

3708.	the area under the velocity time graph gives a physical quantity whose unit is _________
Answer» the area under the velocity time graph gives a physical quantity whose unit is _________

Discussion

3709.	Give one example of a motion where an object does not change its speed but its direction of motion changes continuously.
Answer» Give one example of a motion where an object does not change its speed but its direction of motion changes continuously.

Discussion

3710.	A spring of natural lenght x_o exerts a force F when it is compressed to lenght 3x_o/4 .Find the work done by the spring in restoring itself to natural lenght
Answer» A spring of natural lenght x_o exerts a force F when it is compressed to lenght 3x_o/4 .Find the work done by the spring in restoring itself to natural lenght

Discussion

3711.	A ball thrown vertically upwards with a speed of 19.6 m/s from the top of a tower returns to the earth in 6s. Find the height of tower :
Answer» A ball thrown vertically upwards with a speed of 19.6 m/s from the top of a tower returns to the earth in 6s. Find the height of tower :

3711.

A ball thrown vertically upwards with a speed of 19.6 m/s from the top of a tower returns to the earth in 6s. Find the height of tower :

Answer»

A ball thrown vertically upwards with a speed of 19.6 m/s from the top of a tower returns to the earth in 6s. Find the height of tower :

Discussion

3712.	Prove that twice of focal length is equal to radius of curvature
Answer» Prove that twice of focal length is equal to radius of curvature

Discussion

3713.	29.Parallel rays are incident on a thick plano-convex lens having radius of curvature R, refractive index u and thickness t. When rays are incident on plane surface they converge at a distance x from plane surface when ray are incident on curved surface Then rays converges at y distance from curved surface then (a) x = y (b) x > y (c) x < y (d) none
Answer» 29.Parallel rays are incident on a thick plano-convex lens having radius of curvature R, refractive index u and thickness t. When rays are incident on plane surface they converge at a distance x from plane surface when ray are incident on curved surface Then rays converges at y distance from curved surface then (a) x = y (b) x > y (c) x < y (d) none

Discussion

3714.	The number of possible natural oscillations of air column in a pipe closed at one end of length 85 cm whose frequencies lie below 1250 Hz are \lbrack velocity of sound is 340 m/s\rbrack
Answer» The number of possible natural oscillations of air column in a pipe closed at one end of length 85 cm whose frequencies lie below 1250 Hz are \lbrack velocity of sound is 340 m/s\rbrack

Discussion

3715.	There is some water in the beaker placed on the pan of a spring balance. If we dip our finger in the water without touching the bottom of the beaker, then how does the reading of spring balance change?
Answer» There is some water in the beaker placed on the pan of a spring balance. If we dip our finger in the water without touching the bottom of the beaker, then how does the reading of spring balance change?

Discussion

3716.	The least count of Vernier calipers is 0.1 mm. The main scale reading, before the zero of the Vernier scale, is 10 and the zeroth division of the Vernier scale coincides with the main scale division. Given that each main scale division is 1 mm, the measured value should be expressed as (in cm):
Answer» The least count of Vernier calipers is $0.1 mm$ . The main scale reading, before the zero of the Vernier scale, is $10$ and the zeroth division of the Vernier scale coincides with the main scale division. Given that each main scale division is $1 mm$ , the measured value should be expressed as (in $cm$ ):

Discussion

3717.	A boy stands between the two walls as shown below and he claps his hands.If ‘x’ is less than 60m and the time between the first and the second echo is 0.25s, then calculate the distance ‘x’.Velocity of sound in air is 344 ms−1.
Answer» A boy stands between the two walls as shown below and he claps his hands. If ‘x’ is less than $60 m$ and the time between the first and the second echo is $0.25 s$ , then calculate the distance ‘x’. Velocity of sound in air is $344 m s^{- 1}$ .

Discussion

3718.	One end of a long metallic wire of length L is tied to the celling. The other end is tied to a massless spring of spring constant K. A mass m hangs freely from the free end of the spring. The area of cross-section and the Young's modulus of the wire are A and Y respectively. If the mass is slightly pulled down and released, it will oscillate with a time period T equal to :
Answer» One end of a long metallic wire of length L is tied to the celling. The other end is tied to a massless spring of spring constant K. A mass m hangs freely from the free end of the spring. The area of cross-section and the Young's modulus of the wire are A and Y respectively. If the mass is slightly pulled down and released, it will oscillate with a time period T equal to :

Discussion

3719.	Solar energy can be obtained from:
Answer» Solar energy can be obtained from:

Discussion

3720.	38. Water is flowing through a horizontal pipe of varying cross-section. At any two places, the diameters of the tube are 4 cm and 2 cm.If the pressure difference between these two places be equal to 4.5 cm(water) ,then determine the rate of flow of water in the tube.
Answer» 38. Water is flowing through a horizontal pipe of varying cross-section. At any two places, the diameters of the tube are 4 cm and 2 cm.If the pressure difference between these two places be equal to 4.5 cm(water) ,then determine the rate of flow of water in the tube.

Discussion

3721.	22.A uniform rope of length l is lying in a lump on a frictionless table.a small part of rope is held hanging through a hole in the table just below the lump .the system is then released .the speed of the end of the rope as it leaves the hole is A. \sqrt{}(2gl) B. 2\sqrt{}(gl/3) C. \sqrt{}2(gl/3)
Answer» 22.A uniform rope of length l is lying in a lump on a frictionless table.a small part of rope is held hanging through a hole in the table just below the lump .the system is then released .the speed of the end of the rope as it leaves the hole is A. \sqrt{}(2gl) B. 2\sqrt{}(gl/3) C. \sqrt{}2(gl/3)

Discussion

3722.	The force of gravitation between two bodies in the universe does not depend on:
Answer» The force of gravitation between two bodies in the universe does not depend on:

Discussion

3723.	Ampere circuital law is given by for a closed loop. Now choose the correct alternative.Options:Should have chosen Magnetic field is due to all the current element inside as well as outside the loopMagnetic field is only due to the current element outside the loopWrong Magnetic field is only due to the current element inside the loopMagnetic field is only due to the current element passing through the loop
Answer» Ampere circuital law is given by for a closed loop. Now choose the correct alternative. Options: Should have chosen Magnetic field is due to all the current element inside as well as outside the loop Magnetic field is only due to the current element outside the loop Wrong Magnetic field is only due to the current element inside the loop Magnetic field is only due to the current element passing through the loop

Discussion

3724.	A car travels (14)th of a circular path with radius r. Find the ratio of the distance to its displacement.
Answer» A car travels $(\frac{1}{4})^{t h}$ of a circular path with radius r. Find the ratio of the distance to its displacement.

3724.

A car travels (14)th of a circular path with radius r. Find the ratio of the distance to its displacement.

Answer»

A car travels $(\frac{1}{4})^{t h}$ of a circular path with radius r. Find the ratio of the distance to its displacement.

Discussion

3725.	What will happen if the string to which the stone is tied suddenly snapped? Justify your answer from ground and stone frame of reference
Answer» What will happen if the string to which the stone is tied suddenly snapped? Justify your answer from ground and stone frame of reference

Discussion

3726.	There is a hole in the bottom of tank having water. If total pressure at bottom is 3 atm (1 atm = 105N/m2) then the velocity of water flowing from hole is
Answer» There is a hole in the bottom of tank having water. If total pressure at bottom is 3 atm (1 atm = $10^{5}$ N/ $m^{2}$ ) then the velocity of water flowing from hole is

3726.

There is a hole in the bottom of tank having water. If total pressure at bottom is 3 atm (1 atm = 105N/m2) then the velocity of water flowing from hole is

Answer»

There is a hole in the bottom of tank having water. If total pressure at bottom is 3 atm (1 atm = $10^{5}$ N/ $m^{2}$ ) then the velocity of water flowing from hole is

Discussion

3727.	why there is a difference in the resis†an ce of a bulb when it is cold and when it heats u
Answer» why there is a difference in the resis†an ce of a bulb when it is cold and when it heats u

Discussion

3728.	A spring balance has a scale that reads from 0 to 50 kg. The length of the scale is 20 cm. A body suspended from his balance, when displaced and released, oscillates with a period of 0.6 s. What is the weight of the body ? (Assume that π2=10,g=10m/s2)
Answer» A spring balance has a scale that reads from $0$ to $50 kg$ . The length of the scale is $20 cm$ . A body suspended from his balance, when displaced and released, oscillates with a period of $0.6 s$ . What is the weight of the body ? (Assume that $π^{2} = 10, g = 10 {m/s}^{2}$ )

Discussion

3729.	ntA particle moves a distance x in time t according to equation x = (t + 5)1. The acceleration of particle is proportional ton ntn ntn ntn
Answer» ntA particle moves a distance x in time t according to equation x = (t + 5)1. The acceleration of particle is proportional ton ntn ntn ntn

Discussion

3730.	in YDSE , d=2mm ,D = 2m , wavelength = 500nm . if the intensity of the two silts are I and 9I. thenfind the intensity at y=1/6mm is
Answer» in YDSE , d=2mm ,D = 2m , wavelength = 500nm . if the intensity of the two silts are I and 9I. thenfind the intensity at y=1/6mm is

Discussion

3731.	Q. A stone is dropped from a bridge of height 44.1m above water level. Another stone is thrown into the water 1 second later. If both the atones strikes the water simultaneously, find the initial speed of the second stone.
Answer» Q. A stone is dropped from a bridge of height 44.1m above water level. Another stone is thrown into the water 1 second later. If both the atones strikes the water simultaneously, find the initial speed of the second stone.

Discussion

3732.	Three particles A, B and C are thrown from the top of a tower with the same speed. A is thrown straight up, B is thrown straight down and C is thrown horizontally. They hit the ground with speed VA ,VB ,and Vc then compare the three velocities.
Answer» Three particles A, B and C are thrown from the top of a tower with the same speed. A is thrown straight up, B is thrown straight down and C is thrown horizontally. They hit the ground with speed V_{A ,}V_B,and V_cthen compare the three velocities.

Discussion

3733.	65.A body is moving with a uniform acceleration covers 40m in the first 4second and 120m in the next 4second it's initial velocity and acceleration are
Answer» 65.A body is moving with a uniform acceleration covers 40m in the first 4second and 120m in the next 4second it's initial velocity and acceleration are

Discussion

3734.	A boy is having a mass of 50 kg. What would be his weight on the Earth? g=10 m/s2
Answer» A boy is having a mass of 50 kg. What would be his weight on the Earth? $g = 10 m / s^{2}$

Discussion

3735.	why gravitation force at the centre of the earth is zero
Answer» why gravitation force at the centre of the earth is zero

Discussion

3736.	An insect moves along the sides of a wall of dimension 12 m×5 m, starting from one corner and reaches the diagonally opposite corner. If the insect takes 10 s for its motion, then find the ratio of the average speed to the average velocity of the insect.
Answer» An insect moves along the sides of a wall of dimension $12 m \times 5 m$ , starting from one corner and reaches the diagonally opposite corner. If the insect takes $10 s$ for its motion, then find the ratio of the average speed to the average velocity of the insect.

Discussion

3737.	An object moves in a circular path. Find the distance and displacement covered by by the object.
Answer» An object moves in a circular path. Find the distance and displacement covered by by the object.

Discussion

3738.	Newton's universal law of gravitation?
Answer» Newton's universal law of gravitation?

Discussion

3739.	5. A heavy rod of mass M and length l is lying upon smooth horizontal floor. A small and light particle ofmass m (
Answer» 5. A heavy rod of mass M and length l is lying upon smooth horizontal floor. A small and light particle ofmass m (<< M) moving horizontally with velocity u strikes with the rod and sticks with it. During thesubsequent motion, the force exerted upon one halfof rod due to the other half, will be

Discussion

3740.	19.A charge particle of charge q and mass m is moving with velocity v as shown in figure in a uniform magnetic field B along negative z direction. Select the correct alternatives A) Velocity of the particle when it comes out from the magnetic field is v=vcos60i +vsin60j B) Time for which the particle was in magnetic field is m/3qB C) Distance travelled in magnetic field is mv/3qB D) None of these
Answer» 19.A charge particle of charge q and mass m is moving with velocity v as shown in figure in a uniform magnetic field B along negative z direction. Select the correct alternatives A) Velocity of the particle when it comes out from the magnetic field is v=vcos60i +vsin60j B) Time for which the particle was in magnetic field is m/3qB C) Distance travelled in magnetic field is mv/3qB D) None of these

Discussion

3741.	How the parallex method works ? If its so easy why cant we measures the distances of stars or planets?
Answer» How the parallex method works ? If its so easy why cant we measures the distances of stars or planets?

Discussion

3742.	What do you mean by commercial unit of power? write its unit.
Answer» What do you mean by commercial unit of power? write its unit.

Discussion

3743.	What are conservative forces?
Answer» What are conservative forces?

Discussion

3744.	formal charge on central atom of O3
Answer» formal charge on central atom of O3

Discussion

3745.	A straight magnetic wire of magnetic moment M is folded to form an arc that subtends an angle of 60^° at the centre of curvature. The new value of magnetic moment is (1) 3M/π (2) 2M/π (3) M/π (4) M/3π
Answer» A straight magnetic wire of magnetic moment M is folded to form an arc that subtends an angle of 60^° at the centre of curvature. The new value of magnetic moment is (1) 3M/π (2) 2M/π (3) M/π (4) M/3π

Discussion

3746.	Question 14If two quantities p and q vary inversely with each other, then(a) pq remains constant(b) (p+q) remains constant(c) (p×q) remains constant(d) (p−q) remains constant
Answer» Question 14 If two quantities p and q vary inversely with each other, then (a) $\frac{p}{q} r e m a i n s c o n s t a n t$ (b) $(p + q) r e m a i n s c o n s t a n t$ (c) $(p \times q) r e m a i n s c o n s t a n t$ (d) $(p - q) r e m a i n s c o n s t a n t$

3746.

Question 14If two quantities p and q vary inversely with each other, then(a) pq remains constant(b) (p+q) remains constant(c) (p×q) remains constant(d) (p−q) remains constant

Answer»

Question 14

If two quantities p and q vary inversely with each other, then

(a) $\frac{p}{q} r e m a i n s c o n s t a n t$

(b) $(p + q) r e m a i n s c o n s t a n t$

(c) $(p \times q) r e m a i n s c o n s t a n t$

(d) $(p - q) r e m a i n s c o n s t a n t$

Discussion

3747.	What kind of energy tranformations take place at a coal-based thermal power station ?
Answer» What kind of energy tranformations take place at a coal-based thermal power station ?

Discussion

3748.	What is mean by magmitude.(Please explain in simplest manner)
Answer» What is mean by magmitude.(Please explain in simplest manner)

Discussion

3749.	During an experiment a signal from a spaceship reach the ground station in five minutes. What was the distance of the spaceship from the ground station? The signal Travels at the speed of light that is 3×10 ^ 8 metre per second.
Answer» During an experiment a signal from a spaceship reach the ground station in five minutes. What was the distance of the spaceship from the ground station? The signal Travels at the speed of light that is 3×10 ^ 8 metre per second.

Discussion

3750.	A boy have a mass of 50 kg. What would be his weight on the Earth? (g = 10 ms−2)
Answer» A boy have a mass of 50 kg. What would be his weight on the Earth? ( $g = 10 m s^{- 2}$ )

Discussion

Explore topic-wise InterviewSolutions in .

An object is fall freely from a height of 70 m. If the mass of an object is 4 kg. Find the kinetic energy before it strikes the ground.

Find the current in the given circuit

Two cars, laferrari and McLaren P1 are having a competition for highest speed. Laferrari can accelerate with 20m/xxx till 5seca and MacLean with 17m/xxx up to 6 seconds. Who wins.

Find the time required for a 50Hz AC to change its value from zero to rms value.

Reflection of sound is called:

A ball is thrown from 9th floor of a building with initial speed of 10 ms-1 at an angle of 60° to vertical. It reaches, the base of building in 3 second. The maximum height reached the ball above the base level is(1) 28. 5 m13 31.25 m(2) 38.5 m(4)32.5 m

Question 71(iv)The following graph shows the journey made by two cyclists, one from town A to B and the other from town B to A.How far had cyclist II travelled when he met cyclist I?

the area under the velocity time graph gives a physical quantity whose unit is _________

Give one example of a motion where an object does not change its speed but its direction of motion changes continuously.

A spring of natural lenght x_o exerts a force F when it is compressed to lenght 3x_o/4 .Find the work done by the spring in restoring itself to natural lenght

A ball thrown vertically upwards with a speed of 19.6 m/s from the top of a tower returns to the earth in 6s. Find the height of tower :

Prove that twice of focal length is equal to radius of curvature

The number of possible natural oscillations of air column in a pipe closed at one end of length 85 cm whose frequencies lie below 1250 Hz are \lbrack velocity of sound is 340 m/s\rbrack

There is some water in the beaker placed on the pan of a spring balance. If we dip our finger in the water without touching the bottom of the beaker, then how does the reading of spring balance change?

The least count of Vernier calipers is 0.1 mm. The main scale reading, before the zero of the Vernier scale, is 10 and the zeroth division of the Vernier scale coincides with the main scale division. Given that each main scale division is 1 mm, the measured value should be expressed as (in cm):

A boy stands between the two walls as shown below and he claps his hands.If ‘x’ is less than 60m and the time between the first and the second echo is 0.25s, then calculate the distance ‘x’.Velocity of sound in air is 344 ms−1.

Solar energy can be obtained from:

38. Water is flowing through a horizontal pipe of varying cross-section. At any two places, the diameters of the tube are 4 cm and 2 cm.If the pressure difference between these two places be equal to 4.5 cm(water) ,then determine the rate of flow of water in the tube.

22.A uniform rope of length l is lying in a lump on a frictionless table.a small part of rope is held hanging through a hole in the table just below the lump .the system is then released .the speed of the end of the rope as it leaves the hole is A. \sqrt{}(2gl) B. 2\sqrt{}(gl/3) C. \sqrt{}2(gl/3)

The force of gravitation between two bodies in the universe does not depend on:

A car travels (14)th of a circular path with radius r. Find the ratio of the distance to its displacement.

What will happen if the string to which the stone is tied suddenly snapped? Justify your answer from ground and stone frame of reference

There is a hole in the bottom of tank having water. If total pressure at bottom is 3 atm (1 atm = 105N/m2) then the velocity of water flowing from hole is

why there is a difference in the resis†an ce of a bulb when it is cold and when it heats u

A spring balance has a scale that reads from 0 to 50 kg. The length of the scale is 20 cm. A body suspended from his balance, when displaced and released, oscillates with a period of 0.6 s. What is the weight of the body ? (Assume that π2=10,g=10m/s2)

ntA particle moves a distance x in time t according to equation x = (t + 5)1. The acceleration of particle is proportional ton ntn ntn ntn

in YDSE , d=2mm ,D = 2m , wavelength = 500nm . if the intensity of the two silts are I and 9I. thenfind the intensity at y=1/6mm is

Q. A stone is dropped from a bridge of height 44.1m above water level. Another stone is thrown into the water 1 second later. If both the atones strikes the water simultaneously, find the initial speed of the second stone.

Three particles A, B and C are thrown from the top of a tower with the same speed. A is thrown straight up, B is thrown straight down and C is thrown horizontally. They hit the ground with speed VA ,VB ,and Vc then compare the three velocities.

65.A body is moving with a uniform acceleration covers 40m in the first 4second and 120m in the next 4second it's initial velocity and acceleration are

A boy is having a mass of 50 kg. What would be his weight on the Earth? g=10 m/s2

why gravitation force at the centre of the earth is zero

An insect moves along the sides of a wall of dimension 12 m×5 m, starting from one corner and reaches the diagonally opposite corner. If the insect takes 10 s for its motion, then find the ratio of the average speed to the average velocity of the insect.

An object moves in a circular path. Find the distance and displacement covered by by the object.

Newton's universal law of gravitation?

5. A heavy rod of mass M and length l is lying upon smooth horizontal floor. A small and light particle ofmass m (

How the parallex method works ? If its so easy why cant we measures the distances of stars or planets?

What do you mean by commercial unit of power? write its unit.

What are conservative forces?

formal charge on central atom of O3

A straight magnetic wire of magnetic moment M is folded to form an arc that subtends an angle of 60^° at the centre of curvature. The new value of magnetic moment is (1) 3M/π (2) 2M/π (3) M/π (4) M/3π

Question 14If two quantities p and q vary inversely with each other, then(a) pq remains constant(b) (p+q) remains constant(c) (p×q) remains constant(d) (p−q) remains constant

What kind of energy tranformations take place at a coal-based thermal power station ?

What is mean by magmitude.(Please explain in simplest manner)

During an experiment a signal from a spaceship reach the ground station in five minutes. What was the distance of the spaceship from the ground station? The signal Travels at the speed of light that is 3×10 ^ 8 metre per second.

A boy have a mass of 50 kg. What would be his weight on the Earth? (g = 10 ms−2)