13232 + Interview Questions in Physics Page 147 InterviewSolution

7301.	A car weighing 1600 kg moving with a velocity of 30 m/ s retards uniformly coming to rest in 20s. Calculate the Rate of change of momentum of the car and acceleration of the car
Answer» A car weighing 1600 kg moving with a velocity of 30 m/ s retards uniformly coming to rest in 20s. Calculate the Rate of change of momentum of the car and acceleration of the car

Discussion

7302.	A car is moving in a circular path of radius 2m.Calculate both the distance and the magnitude of displacement of the car after completing 1. One revolution2. One half revolution 3. One fourth revolution.What can you conclude about the relationship between the distance and displacement?
Answer» A car is moving in a circular path of radius 2m. Calculate both the distance and the magnitude of displacement of the car after completing 1. One revolution 2. One half revolution 3. One fourth revolution. What can you conclude about the relationship between the distance and displacement?

7302.

A car is moving in a circular path of radius 2m.Calculate both the distance and the magnitude of displacement of the car after completing 1. One revolution2. One half revolution 3. One fourth revolution.What can you conclude about the relationship between the distance and displacement?

Answer»

A car is moving in a circular path of radius 2m.

Calculate both the distance and the magnitude of displacement of the car after completing 1. One revolution

2. One half revolution

3. One fourth revolution.

What can you conclude about the relationship between the distance and displacement?

Discussion

7303.	how to find order of solobiliities among gr 1 and grp 2 comppunds
Answer» how to find order of solobiliities among gr 1 and grp 2 comppunds

Discussion

7304.	Question 8 Two children are at opposite ends of an aluminium rod. One strikes the end of the rod with a stone. Find the ratio of times taken by the sound wave in air and in aluminium to reach the second child.
Answer» Question 8 Two children are at opposite ends of an aluminium rod. One strikes the end of the rod with a stone. Find the ratio of times taken by the sound wave in air and in aluminium to reach the second child.

Discussion

7305.	If P.E. of a system is given by relation U=A/x^2-B/X where a and B are positive constant then the mean position of oscillation is
Answer» If P.E. of a system is given by relation U=A/x^2-B/X where a and B are positive constant then the mean position of oscillation is

Discussion

7306.	The linear momentum of a particle is given as a function of t p=At^2+Bt+C.The dimension of cons†an t B ar
Answer» The linear momentum of a particle is given as a function of t p=At^2+Bt+C.The dimension of cons†an t B ar

Discussion

7307.	A body starts from rest and moves with a constant acceleration. It travels a distance s₁ in first 10 s and a distance s₂ in next 10 s. Find the relation b/w s₁ and s₂.
Answer» A body starts from rest and moves with a constant acceleration. It travels a distance s₁ in first 10 s and a distance s₂ in next 10 s. Find the relation b/w s₁ and s₂.

Discussion

7308.	A motor car moving at a speed of 72 km/h can not come to stop in less than 3 sec while for a truck this time interval is 5 sec. On a highway the car is moving behind truck with the same speed 72 km/h. The truck gives a signal that it is going to stop at an emergency. At what dis†an ce the car should be from the truck so that it does not collide with truck ? Human response time is 0.5 sec
Answer» A motor car moving at a speed of 72 km/h can not come to stop in less than 3 sec while for a truck this time interval is 5 sec. On a highway the car is moving behind truck with the same speed 72 km/h. The truck gives a signal that it is going to stop at an emergency. At what dis†an ce the car should be from the truck so that it does not collide with truck ? Human response time is 0.5 sec

Discussion

7309.	Why does a balloon go up when we leave it at a certain height but an apple dropped at the same height comes down? What is the force of gravity on these objects?
Answer» Why does a balloon go up when we leave it at a certain height but an apple dropped at the same height comes down? What is the force of gravity on these objects?

Discussion

7310.	a dip needle vibrates in a vertical plane perpendicular to the geographical meridian. The time period of vibration is found to be 2 second. The same needle is then allowed to vibrate in the horizontal plane and the time period is again found to be 2 second. If the angle of declination is 60 degrees, then the true value of angle of dip is
Answer» a dip needle vibrates in a vertical plane perpendicular to the geographical meridian. The time period of vibration is found to be 2 second. The same needle is then allowed to vibrate in the horizontal plane and the time period is again found to be 2 second. If the angle of declination is 60 degrees, then the true value of angle of dip is

Discussion

7311.	a static charge can produces 1)An electric field 2)magnetic field 3) bith 1&
Answer» a static charge can produces 1)An electric field 2)magnetic field 3) bith 1&

Discussion

7312.	Question 4 (a)How can three resistors of resistances 2 Ω,3 Ω and 6 Ω be connected to give a total resistance of(a) 4 Ω?
Answer» Question 4 (a) How can three resistors of resistances $2 Ω, 3 Ω$ and $6 Ω$ be connected to give a total resistance of (a) $4 Ω$ ?

Discussion

7313.	Competition and Ammensalism are which type of interactions:
Answer» Competition and Ammensalism are which type of interactions:

Discussion

7314.	When force of a newton acts on a mass of 1kg then the object moves with a/an A)speed of 1m/s B)speed of 1km/s C)acceleration of 10m/second square D)acceleration of 1m/second squarw
Answer» When force of a newton acts on a mass of 1kg then the object moves with a/an A)speed of 1m/s B)speed of 1km/s C)acceleration of 10m/second square D)acceleration of 1m/second squarw

7314.

When force of a newton acts on a mass of 1kg then the object moves with a/an A)speed of 1m/s B)speed of 1km/s C)acceleration of 10m/second square D)acceleration of 1m/second squarw

Answer»

When force of a newton acts on a mass of 1kg then the object moves with a/an

A)speed of 1m/s

B)speed of 1km/s

C)acceleration of 10m/second square

D)acceleration of 1m/second squarw

Discussion

7315.	88. What is the change in momentum of a car of weighing 1500 kg when it's speed increases from 36 km/h to 72 km/h uniformly ?
Answer» 88. What is the change in momentum of a car of weighing 1500 kg when it's speed increases from 36 km/h to 72 km/h uniformly ?

Discussion

7316.	Question 13A hockey ball of mass 200 g travelling at 10 ms−1 is struck by a hockey stick so as to return it along its original path with a velocity at 5 ms−1. Calculate the change of momentum occurred in the motion of the hockey ball by the force applied by the hockey stick.
Answer» Question 13 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 change of momentum occurred in the motion of the hockey ball by the force applied by the hockey stick.

Discussion

7317.	a player kicks a ball an angle 37 degree to the horizontal with an initial speed of 15m/s find its time of flight
Answer» a player kicks a ball an angle 37 degree to the horizontal with an initial speed of 15m/s find its time of flight

Discussion

7318.	The density of a metal is 10.8×103 kg/m3. Find the relative density of the metal.
Answer» The density of a metal is $10.8 \times 10^{3} kg / m^{3}$ . Find the relative density of the metal.

Discussion

7319.	Plan a small experiment to prove that Earth acts as a huge bar magnet.
Answer» Plan a small experiment to prove that Earth acts as a huge bar magnet.

Discussion

7320.	a person moving on horizontal road with speed 5km/h .then observe that rain strike him vertically downward .when person increases his speed to 10km/h.then raindrop appear to strike at an angle of 45 degree .then waht is the actual velocity of rai
Answer» a person moving on horizontal road with speed 5km/h .then observe that rain strike him vertically downward .when person increases his speed to 10km/h.then raindrop appear to strike at an angle of 45 degree .then waht is the actual velocity of rai

Discussion

7321.	The minimum speed of wind which is required to run a windmill is:
Answer» The minimum speed of wind which is required to run a windmill is:

7321.

The minimum speed of wind which is required to run a windmill is:

Answer»

The minimum speed of wind which is required to run a windmill is:

Discussion

7322.	46.Define Vanderbilt Graff generator
Answer» 46.Define Vanderbilt Graff generator

Discussion

7323.	In an hour glass the sand is replaced with electrons. The electrons flow down with a rate of electrons per sec, for a time duration of 1 hour. If in the middle section of the hour glass I place a resistor of 10 ohm. Find the heat energy dissipated by the bulb.
Answer» In an hour glass the sand is replaced with electrons. The electrons flow down with a rate of electrons per sec, for a time duration of 1 hour. If in the middle section of the hour glass I place a resistor of 10 ohm. Find the heat energy dissipated by the bulb.

Discussion

7324.	Suppose you and your friend are sitting in a moving car. Then your friend is in motion with respect to ___.
Answer» Suppose you and your friend are sitting in a moving car. Then your friend is in motion with respect to ___.

Discussion

7325.	What is center of gravity?
Answer» What is center of gravity?

Discussion

7326.	If the linear momentum of body is increased by 50% what will be the percentage increase in the kinetic energy of the body. ?
Answer» If the linear momentum of body is increased by 50% what will be the percentage increase in the kinetic energy of the body. ?

Discussion

7327.	A source is moving along a circle given by the equation x2 + y2 = R2, with cons†an t speed , in anti-clockwise sense. A detector is at rest at point (2R, 0) w.r.t. the centre of the circle. If the frequency emitted by the source is f and the speed of sound, C = 330 m/s. Then a) The position of the source when the detector records the maximum frequency is b) The coordinate of the source when the detector records minimum frequency is c) The maximum frequency recorded by the detector is d) The minimum frequency recorded by the detector is
Answer» A source is moving along a circle given by the equation x2 + y2 = R2, with cons†an t speed , in anti-clockwise sense. A detector is at rest at point (2R, 0) w.r.t. the centre of the circle. If the frequency emitted by the source is f and the speed of sound, C = 330 m/s. Then a) The position of the source when the detector records the maximum frequency is b) The coordinate of the source when the detector records minimum frequency is c) The maximum frequency recorded by the detector is d) The minimum frequency recorded by the detector is

Discussion

7328.	Aarushi was driving a car with uniform speed of 60km/h. Draw distance-time graph. From the graph, find the distance travelled by Aarushi in(i) 212 Hours(ii) 12 Hour
Answer» Aarushi was driving a car with uniform speed of 60km/h. Draw distance-time graph. From the graph, find the distance travelled by Aarushi in (i) $2 \frac{1}{2}$ Hours (ii) $\frac{1}{2}$ Hour

Discussion

7329.	Question 3 Assuming land to be uniformly fertile, the area of land and the yield on it vary(a) directly with each other(b) inversely with each other(c) Neither directly nor inversely with each other(d) Sometimes directly and sometimes inversely with each other
Answer» Question 3 Assuming land to be uniformly fertile, the area of land and the yield on it vary (a) directly with each other (b) inversely with each other (c) Neither directly nor inversely with each other (d) Sometimes directly and sometimes inversely with each other

7329.

Question 3 Assuming land to be uniformly fertile, the area of land and the yield on it vary(a) directly with each other(b) inversely with each other(c) Neither directly nor inversely with each other(d) Sometimes directly and sometimes inversely with each other

Answer»

Question 3

Assuming land to be uniformly fertile, the area of land and the yield on it vary

(a) directly with each other

(b) inversely with each other

(c) Neither directly nor inversely with each other

(d) Sometimes directly and sometimes inversely with each other

Discussion

7330.	The potential difference across a straight wire of 10−3 cm2 cross-sectional area and 50 cm length, is 2 V, when a current of 0.25 A flows in the wire. Calculate the conductivity of the metal.
Answer» The potential difference across a straight wire of $10^{- 3} {cm}^{2}$ cross-sectional area and $50 cm$ length, is $2 V$ , when a current of $0.25 A$ flows in the wire. Calculate the conductivity of the metal.

Discussion

7331.	We know that, Wext = -W, So why option A will not correct and also explain why option B will correct,A negative charge is moved by an external agent in the direction of electric field. Then Options: Positive work is done by the electric field Potential energy of the charge increases Potential energy of the charge decreases Both (1) and (2)
Answer» We know that, Wext = -W, So why option A will not correct and also explain why option B will correct, A negative charge is moved by an external agent in the direction of electric field. Then Options: Positive work is done by the electric field Potential energy of the charge increases Potential energy of the charge decreases Both (1) and (2)

Discussion

7332.	How does a heavy iron ship float on the water and does not sink because of it weight?
Answer» How does a heavy iron ship float on the water and does not sink because of it weight?

7332.

How does a heavy iron ship float on the water and does not sink because of it weight?

Answer»

How does a heavy iron ship float on the water and does not sink because of it weight?

Discussion

7333.	Explain the meaning of derived unit with the help of one example.
Answer» Explain the meaning of derived unit with the help of one example.

Discussion

7334.	The velocity of a body moving in a straight line is increased by applying a constant force F, for some distance in the direction of the motion. Prove that the increase in the kinetic energy of the body is equal to the work done by the force on the body.
Answer» The velocity of a body moving in a straight line is increased by applying a constant force F, for some distance in the direction of the motion. Prove that the increase in the kinetic energy of the body is equal to the work done by the force on the body.

Discussion

7335.	Name the unit used to measure the loudness of sound. Also, write its symbol.
Answer» Name the unit used to measure the loudness of sound. Also, write its symbol.

Discussion

7336.	23.A race car accelerates on a straight road from rest to a speed of 180km/h in 25s. Assuming uniform acceleration of the car throughout. Find distance travelled in this time?
Answer» 23.A race car accelerates on a straight road from rest to a speed of 180km/h in 25s. Assuming uniform acceleration of the car throughout. Find distance travelled in this time?

Discussion

7337.	A cart of weight 10 N is pulled 1.2 m up a ramp by an applied force of magnitude 5.0 N (parallel to the ramp), raising the cart 0.50 m above its initial level. Calculate percentage efficiency of the work?
Answer» A cart of weight $10 N$ is pulled $1.2 m$ up a ramp by an applied force of magnitude $5.0 N$ (parallel to the ramp), raising the cart $0.50 m$ above its initial level. Calculate percentage efficiency of the work?

Discussion

7338.	An object moves with an acceleration of 3 ms−2 when a force of 30 N is applied. The mass of the body is ___.
Answer» An object moves with an acceleration of $3 m s^{- 2}$ when a force of $30 N$ is applied. The mass of the body is ___.

Discussion

7339.	A convex mirror of focal length f forms an image which is 1n times the object. The distance of the object from the mirror is:
Answer» A convex mirror of focal length f forms an image which is $\frac{1}{n}$ times the object. The distance of the object from the mirror is:

Discussion

7340.	From where does raindrop gain kinetic energy?
Answer» From where does raindrop gain kinetic energy?

Discussion

7341.	__________ is the best test for magnetism.
Answer» __________ is the best test for magnetism.

Discussion

7342.	87. A small sphere of mass m suspended by a thread is first taken aside so that the thread forms right angle with the vertical and then released. Then the thread tension at the moment when the vertical component of the sphere's velocity is maximum is?
Answer» 87. A small sphere of mass m suspended by a thread is first taken aside so that the thread forms right angle with the vertical and then released. Then the thread tension at the moment when the vertical component of the sphere's velocity is maximum is?

Discussion

7343.	Describe the motion of a body which is accelerating at a constant rate of 10 m §−2. If the body starts from rest, how much distance will it cover in 2 s?
Answer» Describe the motion of a body which is accelerating at a constant rate of 10 m $§^{- 2}$ . If the body starts from rest, how much distance will it cover in 2 s?

Discussion

7344.	In a circuit two resistances of the same material and cross section area but different length L1 & L2 are kept in series. Find the length of the equivalent resistance if it’s made of the same material and same cross section area.
Answer» In a circuit two resistances of the same material and cross section area but different length $L_{1}$ & $L_{2}$ are kept in series. Find the length of the equivalent resistance if it’s made of the same material and same cross section area.

Discussion

7345.	6×1017 electrons passes through a cross-sectional area of a wire per minute. What is the electric current ?
Answer» $6 \times 10^{17}$ electrons passes through a cross-sectional area of a wire per minute. What is the electric current ?

Discussion

7346.	What is the French system of units also known as?
Answer» What is the French system of units also known as?

Discussion

7347.	M1 and M2 are plane mirrors and kept parallel to each other. At point O, there will be a maxima for wavelength λ. Light from a monochromatic source S of wavelength λ is not reaching directly on the screeen. Then λ is :
Answer» $M_{1} and M_{2}$ are plane mirrors and kept parallel to each other. At point $O$ , there will be a maxima for wavelength $λ$ . Light from a monochromatic source $S$ of wavelength $λ$ is not reaching directly on the screeen. Then $λ$ is :

Discussion

7348.	A charge of 5 C experiences a force of 5000 N when it is kept in a uniform electric field. Find the potential difference (inV) between two points seperated by a distance of 1 cm.
Answer» A charge of $5 C$ experiences a force of $5000 N$ when it is kept in a uniform electric field. Find the potential difference (in $V$ ) between two points seperated by a distance of $1 cm$ .

Discussion

7349.	Which of the following statements about abiotic components of the ecosystem is incorrect?
Answer» Which of the following statements about abiotic components of the ecosystem is incorrect?

7349.

Which of the following statements about abiotic components of the ecosystem is incorrect?

Answer»

Which of the following statements about abiotic components of the ecosystem is incorrect?

Discussion

7350.	A particle of mass m moves with a constant speed v on a circular path of radius r. Find magnitude of average force on it in half revo
Answer» A particle of mass m moves with a constant speed v on a circular path of radius r. Find magnitude of average force on it in half revo

Discussion

Explore topic-wise InterviewSolutions in .

A car weighing 1600 kg moving with a velocity of 30 m/ s retards uniformly coming to rest in 20s. Calculate the Rate of change of momentum of the car and acceleration of the car

A car is moving in a circular path of radius 2m.Calculate both the distance and the magnitude of displacement of the car after completing 1. One revolution2. One half revolution 3. One fourth revolution.What can you conclude about the relationship between the distance and displacement?

how to find order of solobiliities among gr 1 and grp 2 comppunds

Question 8 Two children are at opposite ends of an aluminium rod. One strikes the end of the rod with a stone. Find the ratio of times taken by the sound wave in air and in aluminium to reach the second child.

If P.E. of a system is given by relation U=A/x^2-B/X where a and B are positive constant then the mean position of oscillation is

The linear momentum of a particle is given as a function of t p=At^2+Bt+C.The dimension of cons†an t B ar

A body starts from rest and moves with a constant acceleration. It travels a distance s₁ in first 10 s and a distance s₂ in next 10 s. Find the relation b/w s₁ and s₂.

Why does a balloon go up when we leave it at a certain height but an apple dropped at the same height comes down? What is the force of gravity on these objects?

a static charge can produces 1)An electric field 2)magnetic field 3) bith 1&

Question 4 (a)How can three resistors of resistances 2 Ω,3 Ω and 6 Ω be connected to give a total resistance of(a) 4 Ω?

Competition and Ammensalism are which type of interactions:

When force of a newton acts on a mass of 1kg then the object moves with a/an A)speed of 1m/s B)speed of 1km/s C)acceleration of 10m/second square D)acceleration of 1m/second squarw

88. What is the change in momentum of a car of weighing 1500 kg when it's speed increases from 36 km/h to 72 km/h uniformly ?

Question 13A hockey ball of mass 200 g travelling at 10 ms−1 is struck by a hockey stick so as to return it along its original path with a velocity at 5 ms−1. Calculate the change of momentum occurred in the motion of the hockey ball by the force applied by the hockey stick.

a player kicks a ball an angle 37 degree to the horizontal with an initial speed of 15m/s find its time of flight

The density of a metal is 10.8×103 kg/m3. Find the relative density of the metal.

Plan a small experiment to prove that Earth acts as a huge bar magnet.

a person moving on horizontal road with speed 5km/h .then observe that rain strike him vertically downward .when person increases his speed to 10km/h.then raindrop appear to strike at an angle of 45 degree .then waht is the actual velocity of rai

The minimum speed of wind which is required to run a windmill is:

46.Define Vanderbilt Graff generator

In an hour glass the sand is replaced with electrons. The electrons flow down with a rate of electrons per sec, for a time duration of 1 hour. If in the middle section of the hour glass I place a resistor of 10 ohm. Find the heat energy dissipated by the bulb.

Suppose you and your friend are sitting in a moving car. Then your friend is in motion with respect to ___.

What is center of gravity?

If the linear momentum of body is increased by 50% what will be the percentage increase in the kinetic energy of the body. ?

Aarushi was driving a car with uniform speed of 60km/h. Draw distance-time graph. From the graph, find the distance travelled by Aarushi in(i) 212 Hours(ii) 12 Hour

Question 3 Assuming land to be uniformly fertile, the area of land and the yield on it vary(a) directly with each other(b) inversely with each other(c) Neither directly nor inversely with each other(d) Sometimes directly and sometimes inversely with each other

The potential difference across a straight wire of 10−3 cm2 cross-sectional area and 50 cm length, is 2 V, when a current of 0.25 A flows in the wire. Calculate the conductivity of the metal.

How does a heavy iron ship float on the water and does not sink because of it weight?

Explain the meaning of derived unit with the help of one example.

The velocity of a body moving in a straight line is increased by applying a constant force F, for some distance in the direction of the motion. Prove that the increase in the kinetic energy of the body is equal to the work done by the force on the body.

Name the unit used to measure the loudness of sound. Also, write its symbol.

23.A race car accelerates on a straight road from rest to a speed of 180km/h in 25s. Assuming uniform acceleration of the car throughout. Find distance travelled in this time?

A cart of weight 10 N is pulled 1.2 m up a ramp by an applied force of magnitude 5.0 N (parallel to the ramp), raising the cart 0.50 m above its initial level. Calculate percentage efficiency of the work?

An object moves with an acceleration of 3 ms−2 when a force of 30 N is applied. The mass of the body is ___.

A convex mirror of focal length f forms an image which is 1n times the object. The distance of the object from the mirror is:

From where does raindrop gain kinetic energy?

__________ is the best test for magnetism.

87. A small sphere of mass m suspended by a thread is first taken aside so that the thread forms right angle with the vertical and then released. Then the thread tension at the moment when the vertical component of the sphere's velocity is maximum is?

Describe the motion of a body which is accelerating at a constant rate of 10 m §−2. If the body starts from rest, how much distance will it cover in 2 s?

In a circuit two resistances of the same material and cross section area but different length L1 &amp; L2 are kept in series. Find the length of the equivalent resistance if it’s made of the same material and same cross section area.

6×1017 electrons passes through a cross-sectional area of a wire per minute. What is the electric current ?

What is the French system of units also known as?

M1 and M2 are plane mirrors and kept parallel to each other. At point O, there will be a maxima for wavelength λ. Light from a monochromatic source S of wavelength λ is not reaching directly on the screeen. Then λ is :

A charge of 5 C experiences a force of 5000 N when it is kept in a uniform electric field. Find the potential difference (inV) between two points seperated by a distance of 1 cm.

Which of the following statements about abiotic components of the ecosystem is incorrect?

A particle of mass m moves with a constant speed v on a circular path of radius r. Find magnitude of average force on it in half revo

In a circuit two resistances of the same material and cross section area but different length L1 & L2 are kept in series. Find the length of the equivalent resistance if it’s made of the same material and same cross section area.