13232 + Interview Questions in Physics Page 110 InterviewSolution

5451.	Why does a person injure himself more if he jumps on a hard ground than a sand surface?
Answer» Why does a person injure himself more if he jumps on a hard ground than a sand surface?

Discussion

5452.	A particle of mass 1 kg is moving with a velocity (i+j-k)m/s. If position vector r=2i-j, then find angular momentum about origin.
Answer» A particle of mass 1 kg is moving with a velocity (i+j-k)m/s. If position vector r=2i-j, then find angular momentum about origin.

Discussion

5453.	A progressive transverse wave has a speed of 5040 m/s, its frequency is 315 Hz, then the distance between a crest and an immediate trough is:
Answer» A progressive transverse wave has a speed of 5040 m/s, its frequency is 315 Hz, then the distance between a crest and an immediate trough is:

Discussion

5454.	Rocks are sometimes used along coasts to prevent erosion. If a rock needs to weigh 2,000 kilograms (about 2 tons) in order not to be shifted by waves, what volume does it need to be? (Density of rock is 3200kg/m3).
Answer» Rocks are sometimes used along coasts to prevent erosion. If a rock needs to weigh 2,000 kilograms (about 2 tons) in order not to be shifted by waves, what volume does it need to be? $(D e n s i t y o f r o c k i s 3200 k g / m^{3})$ .

5454.

Rocks are sometimes used along coasts to prevent erosion. If a rock needs to weigh 2,000 kilograms (about 2 tons) in order not to be shifted by waves, what volume does it need to be? (Density of rock is 3200kg/m3).

Answer»

Rocks are sometimes used along coasts to prevent erosion. If a rock needs to weigh 2,000 kilograms (about 2 tons) in order not to be shifted by waves, what volume does it need to be? $(D e n s i t y o f r o c k i s 3200 k g / m^{3})$ .

Discussion

5455.	The displacement of the body is given by x=(2t+3)^2,where x is in metre and t is in seconds find the acceleration of the particle at x=25m
Answer» The displacement of the body is given by x=(2t+3)^2,where x is in metre and t is in seconds find the acceleration of the particle at x=25m

Discussion

5456.	Describe de broglie concept of matter wave How was is confirmed
Answer» Describe de broglie concept of matter wave How was is confirmed

Discussion

5457.	A block of mass m is released along a smooth track as shown in figure from its top point. Find the work done by gravity during its downward motion to the bottom of track.
Answer» A block of mass m is released along a smooth track as shown in figure from its top point. Find the work done by gravity during its downward motion to the bottom of track.

Discussion

5458.	A skydiver with mass of 60 kg is moving at a constant speed of 20 ms−1 . Rate of work done by gravity is _____. Take g=10 ms−2
Answer» A skydiver with mass of $60 k g$ is moving at a constant speed of $20 m s^{- 1}$ . Rate of work done by gravity is _____. Take $g = 10 m s^{- 2}$

Discussion

5459.	two tall buildings face each other and are at a distance of 180 metres .with what velocity must a ball be thrown horizontally from a window 55 m above the ground in one building so that it enters a window 10.9m above the ground in second building?
Answer» two tall buildings face each other and are at a distance of 180 metres .with what velocity must a ball be thrown horizontally from a window 55 m above the ground in one building so that it enters a window 10.9m above the ground in second building?

Discussion

5460.	Which of the following is the correct way of representing a unit?
Answer» Which of the following is the correct way of representing a unit?

Discussion

5461.	Imagine a planet is revolving around a very massive star in a circular orbit of radius R with a period of revolution T. If the gravitational force of attraction between the planet and the star is proportional to R−52, then
Answer» Imagine a planet is revolving around a very massive star in a circular orbit of radius R with a period of revolution T. If the gravitational force of attraction between the planet and the star is proportional to $R^{\frac{- 5}{2}}$ , then

Discussion

5462.	25. The co-ordinates of a moving particle at time t are given by x=A sin t and y=A cos t . The magnitude of acceleration of particle is
Answer» 25. The co-ordinates of a moving particle at time t are given by x=A sin t and y=A cos t . The magnitude of acceleration of particle is

Discussion

5463.	Why can't LPG gas be used in automobiles ?
Answer» Why can't LPG gas be used in automobiles ?

Discussion

5464.	Question 3A train starting from a railway station and moving with uniform acceleration attains a speed 40 kmph in 10 minutes. Find its acceleration.
Answer» Question 3 A train starting from a railway station and moving with uniform acceleration attains a speed 40 kmph in 10 minutes. Find its acceleration.

Discussion

5465.	The velocity - time graph of a body with a constant acceleration is:
Answer» The velocity - time graph of a body with a constant acceleration is:

Discussion

5466.	In which of the following cases, the objects mentioned are in free fall, assuming no friction or air resistance?1. An object dropped from a certain height2. An object is thrown upward3. Flying in an aircraft4. A car accelerating at 9.8 ms−2 on the road
Answer» In which of the following cases, the objects mentioned are in free fall, assuming no friction or air resistance? 1. An object dropped from a certain height 2. An object is thrown upward 3. Flying in an aircraft 4. A car accelerating at $9.8 m s^{- 2}$ on the road

5466.

In which of the following cases, the objects mentioned are in free fall, assuming no friction or air resistance?1. An object dropped from a certain height2. An object is thrown upward3. Flying in an aircraft4. A car accelerating at 9.8 ms−2 on the road

Answer»

In which of the following cases, the objects mentioned are in free fall, assuming no friction or air resistance?

1. An object dropped from a certain height

2. An object is thrown upward

3. Flying in an aircraft

4. A car accelerating at $9.8 m s^{- 2}$ on the road

Discussion

5467.	48. Water is flowing through a right angled bend with avelocity v. The force along the support is if A isarea of cross-section and p is density of waterFig. 5.57(a) 2 Apv2(c) 2 Apv2(b) Apv(d) (2+1) Apv
Answer» 48. Water is flowing through a right angled bend with avelocity v. The force along the support is if A isarea of cross-section and p is density of waterFig. 5.57(a) 2 Apv2(c) 2 Apv2(b) Apv(d) (2+1) Apv

Discussion

5468.	A stone is dropped on the surface of the water in a pond. Name the type of waves produced.
Answer» A stone is dropped on the surface of the water in a pond. Name the type of waves produced.

Discussion

5469.	If G is universal gravitational constant and g is acceleration due to gravity, then dimension of G/g will be?
Answer» If G is universal gravitational constant and g is acceleration due to gravity, then dimension of G/g will be?

Discussion

5470.	V 2(s)33. A ball of mass m is dropped from height h on a horizontal floor which collides with it with speed u. If coefficientof restitution in floor is e, then impulse imparted to ball by the floor on its second rebounce is-2 meu (e + 1)(1) meunua- Un(4) me u (e - 1)(3) me2u (e + 1)I APnarfoctl
Answer» V 2(s)33. A ball of mass m is dropped from height h on a horizontal floor which collides with it with speed u. If coefficientof restitution in floor is e, then impulse imparted to ball by the floor on its second rebounce is-2 meu (e + 1)(1) meunua- Un(4) me u (e - 1)(3) me2u (e + 1)I APnarfoctl

Discussion

5471.	A ray through the Centre of Curvature hitting the spherical mirror makes an angle of __________ with the normal.
Answer» A ray through the Centre of Curvature hitting the spherical mirror makes an angle of __________ with the normal.

Discussion

5472.	An object move on straight line path so that velocity depends upon time as v=t-2) m /s find average speed and average velocity in 4sec.
Answer» An object move on straight line path so that velocity depends upon time as v=t-2) m /s find average speed and average velocity in 4sec.

Discussion

5473.	Why paper get shrink when few water droplets are applied to it and change its property
Answer» Why paper get shrink when few water droplets are applied to it and change its property

Discussion

5474.	___ is the ratio of the height of the image to the height of the object.
Answer» ___ is the ratio of the height of the image to the height of the object.

Discussion

5475.	14. A wagon of mass 2000kg is seperated form a train travelling at 9 km/hr and then the wagon comes to rest in 2 min Find the resistance b/with theach wheels and wagon and the track
Answer» 14. A wagon of mass 2000kg is seperated form a train travelling at 9 km/hr and then the wagon comes to rest in 2 min Find the resistance b/with theach wheels and wagon and the track

Discussion

5476.	Why are thermal power plants set up near coal or oil fields?
Answer» Why are thermal power plants set up near coal or oil fields?

Discussion

5477.	When a striker hits the bottom of the pile of coins placed at the centre of a carrom board, only the lowest coin is displaced. Explain.
Answer» When a striker hits the bottom of the pile of coins placed at the centre of a carrom board, only the lowest coin is displaced. Explain.

Discussion

5478.	lithium is stored in paraffin instead of kerosene. why? give a specific reason.
Answer» lithium is stored in paraffin instead of kerosene. why? give a specific reason.

Discussion

5479.	a narrow glass tube 80 cm long and opens at both ends is half immersed in mercury now the top of the tube is closed and is taken out of mercury . a column of mercury 20cm long remains in the tube . find atmospheric pressure?
Answer» a narrow glass tube 80 cm long and opens at both ends is half immersed in mercury now the top of the tube is closed and is taken out of mercury . a column of mercury 20cm long remains in the tube . find atmospheric pressure?

Discussion

5480.	5.Explain why a ray of light passing through the centre of curvature of a concave mirror gets reflected along the same path?
Answer» 5.Explain why a ray of light passing through the centre of curvature of a concave mirror gets reflected along the same path?

Discussion

5481.	How will the equations of motion for an object moving with a uniform velocity change?
Answer» How will the equations of motion for an object moving with a uniform velocity change?

Discussion

5482.	90A body of mass m is projected from ground with speed u and angle theta with the horizontal. Power delivered by gravity to it at half of maximum height from ground is ?
Answer» 90A body of mass m is projected from ground with speed u and angle theta with the horizontal. Power delivered by gravity to it at half of maximum height from ground is ?

Discussion

5483.	14. The ratio of times of descent of two freely falling bodies released from rest ignoring air resistance is equal to? Which of the following option is correct and why.
Answer» 14. The ratio of times of descent of two freely falling bodies released from rest ignoring air resistance is equal to? Which of the following option is correct and why.

Discussion

5484.	A bullet of mass 50 g is fiered from a rifle of mass 4 kg with initial velocity= 35 m/ s.what is the recoil velocity of the rifle ?
Answer» A bullet of mass 50 g is fiered from a rifle of mass 4 kg with initial velocity= 35 m/ s.what is the recoil velocity of the rifle ?

Discussion

5485.	A current carrying coil having n-turns of cross-section area A is resting in a uniform magnetic field B. Current flowing in the coil is I and plane of coil is making an angle θ with the field. Torque acting on the coil is
Answer» A current carrying coil having n-turns of cross-section area A is resting in a uniform magnetic field B. Current flowing in the coil is I and plane of coil is making an angle θ with the field. Torque acting on the coil is

Discussion

5486.	A car takes 4hrs to travel from Bangalore to Chennai whereas the flight takes only 30min to travel from Bangalore to Chennai. If the distance from Bangalore to Chennai by road is 400km and the air is 150km. Calculate the average speed and average velocity of flight and car. Answer in the given order (in kmhr ): Find the Average speed of Flight, Average velocity of flight, Average speed of car, Average velocity of car.
Answer» A car takes 4hrs to travel from Bangalore to Chennai whereas the flight takes only 30min to travel from Bangalore to Chennai. If the distance from Bangalore to Chennai by road is 400km and the air is 150km. Calculate the average speed and average velocity of flight and car. Answer in the given order (in $\frac{k m}{h r}$ ): Find the Average speed of Flight, Average velocity of flight, Average speed of car, Average velocity of car.

5486.

A car takes 4hrs to travel from Bangalore to Chennai whereas the flight takes only 30min to travel from Bangalore to Chennai. If the distance from Bangalore to Chennai by road is 400km and the air is 150km. Calculate the average speed and average velocity of flight and car. Answer in the given order (in kmhr ): Find the Average speed of Flight, Average velocity of flight, Average speed of car, Average velocity of car.

Answer»

A car takes 4hrs to travel from Bangalore to Chennai whereas the flight takes only 30min to travel from Bangalore to Chennai. If the distance from Bangalore to Chennai by road is 400km and the air is 150km. Calculate the average speed and average velocity of flight and car.

Answer in the given order (in $\frac{k m}{h r}$ ):

Find the Average speed of Flight, Average velocity of flight, Average speed of car, Average velocity of car.

Discussion

5487.	calculate the gravitational potential energy of a system consisting of four equal masses such that their position are coordinate (0,0) (3,0) (3,4) (0,4)
Answer» calculate the gravitational potential energy of a system consisting of four equal masses such that their position are coordinate (0,0) (3,0) (3,4) (0,4)

Discussion

5488.	If the distance between two bodies is increased by 8 times, then the magnitude of the gravitational force between them becomes___________ times.
Answer» If the distance between two bodies is increased by $8$ times, then the magnitude of the gravitational force between them becomes___________ times.

Discussion

5489.	A cubical block is floating in a liquid with half of its volume immersed in the liquid. When the whole system accelerates upwards with acceleration of g/3, the fraction of volume immersed in liquid will be
Answer» A cubical block is floating in a liquid with half of its volume immersed in the liquid. When the whole system accelerates upwards with acceleration of g/3, the fraction of volume immersed in liquid will be

Discussion

5490.	An athlete can take a longer jump if he comes running from a distance. Identify the type of inertia.
Answer» An athlete can take a longer jump if he comes running from a distance. Identify the type of inertia.

Discussion

5491.	Three masses 5 kg, 4 kg and 7 kg are aligned in a straight line as shown below. Find the net gravitational force on 4 kg?
Answer» Three masses $5 k g$ , $4 k g$ and $7 k g$ are aligned in a straight line as shown below. Find the net gravitational force on $4 k g$ ?

Discussion

5492.	Calculate the effective resistance in the following circuit.
Answer» Calculate the effective resistance in the following circuit.

Discussion

5493.	27. The radius of 2nd orbit of He+ ion is x.Then De Broglie wavelength of electron in 3rd orbit will be?
Answer» 27. The radius of 2nd orbit of He+ ion is x.Then De Broglie wavelength of electron in 3rd orbit will be?

Discussion

5494.	In an electrical circuit, a battery is connected to pass 20 C of charge through it in a certain given time. The potential difference between the two plates of the battery is maintained at 15 V. The work done by the battery is _________J.
Answer» In an electrical circuit, a battery is connected to pass $20 C$ of charge through it in a certain given time. The potential difference between the two plates of the battery is maintained at $15 V$ . The work done by the battery is _________ $J$ .

Discussion

5495.	When a force of 10 n is applied continuously on a body and its displacement is 2m find out the magnitude of the work done by the force?
Answer» When a force of 10 n is applied continuously on a body and its displacement is 2m find out the magnitude of the work done by the force?

Discussion

5496.	An apple that falls from a tree is an example of:
Answer» An apple that falls from a tree is an example of:

Discussion

5497.	44.Displacement of a person moving from A to B along a semi circular path of radius r is 100m.What is the distance travelled by him?
Answer» 44.Displacement of a person moving from A to B along a semi circular path of radius r is 100m.What is the distance travelled by him?

Discussion

5498.	A particle moves with constant acceleration. If v1, v2 and v3 are the three average velocities in three successive intervals t1, t2 and t3 of time, prove that: v1-v2/v2-v3=t1+t2/t2+t3.
Answer» A particle moves with constant acceleration. If v1, v2 and v3 are the three average velocities in three successive intervals t1, t2 and t3 of time, prove that: v1-v2/v2-v3=t1+t2/t2+t3.

Discussion

5499.	What can be inferred from the following statement? "Weight of an object on Earth is 98N."
Answer» What can be inferred from the following statement? "Weight of an object on Earth is 98N."

Discussion

5500.	The physical quantity, that is generally used to describe how much a body has travelled is __________.
Answer» The physical quantity, that is generally used to describe how much a body has travelled is __________.

Discussion

Explore topic-wise InterviewSolutions in .

Why does a person injure himself more if he jumps on a hard ground than a sand surface?

A particle of mass 1 kg is moving with a velocity (i+j-k)m/s. If position vector r=2i-j, then find angular momentum about origin.

A progressive transverse wave has a speed of 5040 m/s, its frequency is 315 Hz, then the distance between a crest and an immediate trough is:

Rocks are sometimes used along coasts to prevent erosion. If a rock needs to weigh 2,000 kilograms (about 2 tons) in order not to be shifted by waves, what volume does it need to be? (Density of rock is 3200kg/m3).

The displacement of the body is given by x=(2t+3)^2,where x is in metre and t is in seconds find the acceleration of the particle at x=25m

Describe de broglie concept of matter wave How was is confirmed

A block of mass m is released along a smooth track as shown in figure from its top point. Find the work done by gravity during its downward motion to the bottom of track.

A skydiver with mass of 60 kg is moving at a constant speed of 20 ms−1 . Rate of work done by gravity is _____. Take g=10 ms−2

two tall buildings face each other and are at a distance of 180 metres .with what velocity must a ball be thrown horizontally from a window 55 m above the ground in one building so that it enters a window 10.9m above the ground in second building?

Which of the following is the correct way of representing a unit?

Imagine a planet is revolving around a very massive star in a circular orbit of radius R with a period of revolution T. If the gravitational force of attraction between the planet and the star is proportional to R−52, then

25. The co-ordinates of a moving particle at time t are given by x=A sin t and y=A cos t . The magnitude of acceleration of particle is

Why can't LPG gas be used in automobiles ?

Question 3A train starting from a railway station and moving with uniform acceleration attains a speed 40 kmph in 10 minutes. Find its acceleration.

The velocity - time graph of a body with a constant acceleration is:

In which of the following cases, the objects mentioned are in free fall, assuming no friction or air resistance?1. An object dropped from a certain height2. An object is thrown upward3. Flying in an aircraft4. A car accelerating at 9.8 ms−2 on the road

48. Water is flowing through a right angled bend with avelocity v. The force along the support is if A isarea of cross-section and p is density of waterFig. 5.57(a) 2 Apv2(c) 2 Apv2(b) Apv(d) (2+1) Apv

A stone is dropped on the surface of the water in a pond. Name the type of waves produced.

If G is universal gravitational constant and g is acceleration due to gravity, then dimension of G/g will be?

V 2(s)33. A ball of mass m is dropped from height h on a horizontal floor which collides with it with speed u. If coefficientof restitution in floor is e, then impulse imparted to ball by the floor on its second rebounce is-2 meu (e + 1)(1) meunua- Un(4) me u (e - 1)(3) me2u (e + 1)I APnarfoctl

A ray through the Centre of Curvature hitting the spherical mirror makes an angle of __________ with the normal.

An object move on straight line path so that velocity depends upon time as v=t-2) m /s find average speed and average velocity in 4sec.

Why paper get shrink when few water droplets are applied to it and change its property

___ is the ratio of the height of the image to the height of the object.

14. A wagon of mass 2000kg is seperated form a train travelling at 9 km/hr and then the wagon comes to rest in 2 min Find the resistance b/with theach wheels and wagon and the track

Why are thermal power plants set up near coal or oil fields?

When a striker hits the bottom of the pile of coins placed at the centre of a carrom board, only the lowest coin is displaced. Explain.

lithium is stored in paraffin instead of kerosene. why? give a specific reason.

a narrow glass tube 80 cm long and opens at both ends is half immersed in mercury now the top of the tube is closed and is taken out of mercury . a column of mercury 20cm long remains in the tube . find atmospheric pressure?

5.Explain why a ray of light passing through the centre of curvature of a concave mirror gets reflected along the same path?

How will the equations of motion for an object moving with a uniform velocity change?

90A body of mass m is projected from ground with speed u and angle theta with the horizontal. Power delivered by gravity to it at half of maximum height from ground is ?

14. The ratio of times of descent of two freely falling bodies released from rest ignoring air resistance is equal to? Which of the following option is correct and why.

A bullet of mass 50 g is fiered from a rifle of mass 4 kg with initial velocity= 35 m/ s.what is the recoil velocity of the rifle ?

A current carrying coil having n-turns of cross-section area A is resting in a uniform magnetic field B. Current flowing in the coil is I and plane of coil is making an angle θ with the field. Torque acting on the coil is

calculate the gravitational potential energy of a system consisting of four equal masses such that their position are coordinate (0,0) (3,0) (3,4) (0,4)

If the distance between two bodies is increased by 8 times, then the magnitude of the gravitational force between them becomes___________ times.

A cubical block is floating in a liquid with half of its volume immersed in the liquid. When the whole system accelerates upwards with acceleration of g/3, the fraction of volume immersed in liquid will be

An athlete can take a longer jump if he comes running from a distance. Identify the type of inertia.

Three masses 5 kg, 4 kg and 7 kg are aligned in a straight line as shown below. Find the net gravitational force on 4 kg?

Calculate the effective resistance in the following circuit.

27. The radius of 2nd orbit of He+ ion is x.Then De Broglie wavelength of electron in 3rd orbit will be?

In an electrical circuit, a battery is connected to pass 20 C of charge through it in a certain given time. The potential difference between the two plates of the battery is maintained at 15 V. The work done by the battery is _________J.

When a force of 10 n is applied continuously on a body and its displacement is 2m find out the magnitude of the work done by the force?

An apple that falls from a tree is an example of:

44.Displacement of a person moving from A to B along a semi circular path of radius r is 100m.What is the distance travelled by him?

A particle moves with constant acceleration. If v1, v2 and v3 are the three average velocities in three successive intervals t1, t2 and t3 of time, prove that: v1-v2/v2-v3=t1+t2/t2+t3.

What can be inferred from the following statement? "Weight of an object on Earth is 98N."

The physical quantity, that is generally used to describe how much a body has travelled is __________.