13232 + Interview Questions in Physics Page 105 InterviewSolution

5201.	Four identical cells of emf E and internal resistance r are to be connected in series. Suppose if one of the cells is connected wrongly, the equivalent emf and effective internal resistance of the combination is:
Answer» Four identical cells of emf E and internal resistance r are to be connected in series. Suppose if one of the cells is connected wrongly, the equivalent emf and effective internal resistance of the combination is:

Discussion

5202.	Area under velocity time curve represents which physical quantity
Answer» Area under velocity time curve represents which physical quantity

Discussion

5203.	The wavelength of maximum emitted energy of a body at 700 K is 4.08μm If the temperature of the body is raised to 1400 K, the wavelength of maximum emitted energy will be
Answer» The wavelength of maximum emitted energy of a body at 700 K is 4.08 $μ m$ If the temperature of the body is raised to 1400 K, the wavelength of maximum emitted energy will be

Discussion

5204.	119.A body of mass 6kg is moving with a velocity of 2m/s.calculate the force required to stop it in 5s. How for it will travel before coming to rest?
Answer» 119.A body of mass 6kg is moving with a velocity of 2m/s.calculate the force required to stop it in 5s. How for it will travel before coming to rest?

Discussion

5205.	A solid sphere of mass M and radius R has to be disintegrated into infinite point masses at infinite separation. The work done for this process will be(G - universal gravitational constant)
Answer» A solid sphere of mass M and radius R has to be disintegrated into infinite point masses at infinite separation. The work done for this process will be(G - universal gravitational constant)

Discussion

5206.	Solve the following examples.a. An electric pump has 2 kW power. How much water will the pump lift every minute to a height of 10 m?b. If a 1200 W electric iron is used daily for 30 minutes, how much total electricity is consumed in the month of April?c. If the energy of a ball falling from a height of 10 metres is reduced by 40%, how high will it rebound? d. The velocity of a car increase from 54 km/hr to 72 km/hr. How much is the work done if the mass of the car is 1500 kg?e. Ravi applied a force of 10 N and moved a book 30 cm in the direction of the force. How much was the work done by Ravi?
Answer» Solve the following examples. a. An electric pump has 2 kW power. How much water will the pump lift every minute to a height of 10 m? b. If a 1200 W electric iron is used daily for 30 minutes, how much total electricity is consumed in the month of April? c. If the energy of a ball falling from a height of 10 metres is reduced by 40%, how high will it rebound? d. The velocity of a car increase from 54 km/hr to 72 km/hr. How much is the work done if the mass of the car is 1500 kg? e. Ravi applied a force of 10 N and moved a book 30 cm in the direction of the force. How much was the work done by Ravi?

Discussion

5207.	30.4 charges are placed on a square A= q B= -2q C= +2q and D= -q. The side of the square is 10cm and q=1MC. What is the electric field intensity at the center of square
Answer» 30.4 charges are placed on a square A= q B= -2q C= +2q and D= -q. The side of the square is 10cm and q=1MC. What is the electric field intensity at the center of square

Discussion

5208.	What are alternative fuels and why are they needed?
Answer» What are alternative fuels and why are they needed?

Discussion

5209.	When light of frequency 2vo is incident on a metal plate
Answer» When light of frequency 2vo is incident on a metal plate

Discussion

5210.	A particle is thrown vertically up such that distance travelled by it in 2 second and 9 second are same.Maximum height upto which particle rises is
Answer» A particle is thrown vertically up such that distance travelled by it in 2 second and 9 second are same.Maximum height upto which particle rises is

Discussion

5211.	45.For the figure shown mA=10kg mB=15kg & F=90N.Find the acceleration of the blocks & the frictional forces acting
Answer» 45.For the figure shown mA=10kg mB=15kg & F=90N.Find the acceleration of the blocks & the frictional forces acting

Discussion

5212.	Two bodies A and B of mass 150 gm and 250 gm are approaching towards each other. Both particles have a speed of 3 Ms per second find the magnitude of total linear momentum of the system of two particles
Answer» Two bodies A and B of mass 150 gm and 250 gm are approaching towards each other. Both particles have a speed of 3 Ms per second find the magnitude of total linear momentum of the system of two particles

Discussion

5213.	A car takes 4 hours to travel from Bangalore to Chennai, whereas the flight takes only 30 minutes to travel from Bangalore to Chennai. If the distance from Bangalore to Chennai by road is 400 km and by air is 150 km, find the average speed of flight and average speed of car in the same order.
Answer» A car takes $4 h o u r s$ to travel from Bangalore to Chennai, whereas the flight takes only $30 m i n u t e s$ to travel from Bangalore to Chennai. If the distance from Bangalore to Chennai by road is $400 k m$ and by air is $150 k m$ , find the average speed of flight and average speed of car in the same order.

Discussion

5214.	A body is vibrating in the air, and sound is produced as a result. What happens when the rate of vibration of the object increases?
Answer» A body is vibrating in the air, and sound is produced as a result. What happens when the rate of vibration of the object increases?

Discussion

5215.	A cell of e.m.f E volt with no internal resistance is connected to a wire whose cross-section changes. The wire has three sections of equal length l. The middle section has a radius a, whereas the radius of the outer two sections is 2a. The ratio of the potential difference across section AB to the potential difference across section CA is
Answer» A cell of e.m.f $E volt$ with no internal resistance is connected to a wire whose cross-section changes. The wire has three sections of equal length $l$ . The middle section has a radius $a$ , whereas the radius of the outer two sections is $2 a$ . The ratio of the potential difference across section $AB$ to the potential difference across section $CA$ is

Discussion

5216.	27. A body is projected vertically upwards fromground. If t, and t, be the times at which it isat height h above the projection whileascending and descending respectively, then h1S -(1) 5gt,42 (2) gt,t (3) 2gt,t (4) 2hg2
Answer» 27. A body is projected vertically upwards fromground. If t, and t, be the times at which it isat height h above the projection whileascending and descending respectively, then h1S -(1) 5gt,42 (2) gt,t (3) 2gt,t (4) 2hg2

Discussion

5217.	If action is equal to reaction then how is a horse able to pull a cart.
Answer» If action is equal to reaction then how is a horse able to pull a cart.

Discussion

5218.	A fish in water(refractive index n) looks at a bird vertically above in the air. If y is the height of the bird and x is the depth of the fish from the surface, then the distance of the bird as estimated by the fish is?
Answer» A fish in water(refractive index n) looks at a bird vertically above in the air. If y is the height of the bird and x is the depth of the fish from the surface, then the distance of the bird as estimated by the fish is?

Discussion

5219.	A ball is thrown in xy plane undergoes a projectile with velocity u and angle theta with the horizontal. Draw the following graphs. X-t acc-t KE-h PE-hPE-t.
Answer» A ball is thrown in xy plane undergoes a projectile with velocity u and angle theta with the horizontal. Draw the following graphs. X-t acc-t KE-h PE-h PE-t.

Discussion

5220.	The jet engines of an aeroplane produces thrust which helps it to fly explain its working.
Answer» The jet engines of an aeroplane produces thrust which helps it to fly explain its working.

Discussion

5221.	What is the meaning of- equipotential surfaces offer an alternative visual picture in addition to the picture of electric field lines around a charge configuration.
Answer» What is the meaning of- equipotential surfaces offer an alternative visual picture in addition to the picture of electric field lines around a charge configuration.

Discussion

5222.	What would happen to the Earth, if the Sun suddenly vanishes? (Neglect the gravitational force due to other planets)
Answer» What would happen to the Earth, if the Sun suddenly vanishes? (Neglect the gravitational force due to other planets)

Discussion

5223.	The pitch of the screwguage is 1mm and there are 100 divisions on circular scale when faces A and B are touching each without putting anything between studs . Thirty second division of circular scale coincides with reference scale when a glass plane is placed between studs the linear scale reads 4 divisions and circular scale reads 16 divisions . Find thickness of glass plate. Zero of linear scale is not hidden from circular scale. When A and B touches each other
Answer» The pitch of the screwguage is 1mm and there are 100 divisions on circular scale when faces A and B are touching each without putting anything between studs . Thirty second division of circular scale coincides with reference scale when a glass plane is placed between studs the linear scale reads 4 divisions and circular scale reads 16 divisions . Find thickness of glass plate. Zero of linear scale is not hidden from circular scale. When A and B touches each other

Discussion

5224.	The weight of a body of mass 6.0 kg on the moon is 10 N. If a boy of mass 30 kg goes from earth to the moon surface,what will be his (a) mass, (b) weight ?
Answer» The weight of a body of mass 6.0 kg on the moon is 10 N. If a boy of mass 30 kg goes from earth to the moon surface,what will be his (a) mass, (b) weight ?

Discussion

5225.	nt2000 small bulbs each weighing 1g each, strike 1 square cm of areaper sec with velocity =1000 and rebound with same velocity. find pressure on surfacen
Answer» nt2000 small bulbs each weighing 1g each, strike 1 square cm of areaper sec with velocity =1000 and rebound with same velocity. find pressure on surfacen

Discussion

5226.	Newton's third law says that every action has an equal and opposite reaction.this means that the force applied by sun on Earth and by Earth on sun will be equal.then why does sun does not revolve around Earth?why Earth revolves around sun?
Answer» Newton's third law says that every action has an equal and opposite reaction.this means that the force applied by sun on Earth and by Earth on sun will be equal.then why does sun does not revolve around Earth?why Earth revolves around sun?

Discussion

5227.	A car is moving with a velocity of 80 m/s and it takes 20 s to stop after the brakes are applied. Calculate the force exerted by the brakes on the motorcar if its mass along with the passengers is 1000 kg.
Answer» A car is moving with a velocity of $80 m/s$ and it takes $20 s$ to stop after the brakes are applied. Calculate the force exerted by the brakes on the motorcar if its mass along with the passengers is $1000 kg$ .

Discussion

5228.	Two objects of different masses falling freely near the surface of Moon from same height would
Answer» Two objects of different masses falling freely near the surface of Moon from same height would

Discussion

5229.	For the circuit shown in the figure below, answer the following questions: Would any of the bulb glow when the switch is in the ‘OFF’ position? What will be the order in which the bulb A, B, and C will glow when the switch is moved to the ‘ON’ position?
Answer» For the circuit shown in the figure below, answer the following questions: Would any of the bulb glow when the switch is in the ‘OFF’ position? What will be the order in which the bulb A, B, and C will glow when the switch is moved to the ‘ON’ position?

5229.

For the circuit shown in the figure below, answer the following questions: Would any of the bulb glow when the switch is in the ‘OFF’ position? What will be the order in which the bulb A, B, and C will glow when the switch is moved to the ‘ON’ position?

Answer» For the circuit shown in the figure below, answer the following questions:

Would any of the bulb glow when the switch is in the ‘OFF’ position?

What will be the order in which the bulb A, B, and C will glow when the switch is moved to the ‘ON’ position?

Discussion

5230.	si unit of force
Answer» si unit of force

Discussion

5231.	Name the characteristic of sound which can distinguish between the 'notes' (musical sounds) played the flute and a sitar (both the notes having the same pitch and loudness).
Answer» Name the characteristic of sound which can distinguish between the 'notes' (musical sounds) played the flute and a sitar (both the notes having the same pitch and loudness).

Discussion

5232.	Myopia can be corrected using?
Answer» Myopia can be corrected using?

Discussion

5233.	Calculate the mass of h20 which can be produced by using 44.8 l of h2 measured at ntp
Answer» Calculate the mass of h20 which can be produced by using 44.8 l of h2 measured at ntp

Discussion

5234.	what is velocity
Answer» what is velocity

Discussion

5235.	What is meant by supersonic speed?
Answer» What is meant by supersonic speed?

Discussion

5236.	A sphere of iron and another of wood of the same radius are held under water. Compare the upthrust on the two spheres.
Answer» A sphere of iron and another of wood of the same radius are held under water. Compare the upthrust on the two spheres.

Discussion

5237.	Mass × change in velocity = ___ × time interval. Fill in the blank:
Answer» Mass $\times$ change in velocity = ___ $\times$ time interval. Fill in the blank:

Discussion

5238.	The position of a body moving along x-axis at timet is given by x (t2 - 4t+6) m. The distancetravelled by body in time interval t = 0 tot 3 s is(1) 5 m(2) 7 m(3) 4 m(4) 3 m
Answer» The position of a body moving along x-axis at timet is given by x (t2 - 4t+6) m. The distancetravelled by body in time interval t = 0 tot 3 s is(1) 5 m(2) 7 m(3) 4 m(4) 3 m

Discussion

5239.	(a) What is the meaning of the symbol kWh ? What quantity does it represent ? (b) How much electric energy in kWh is consumed by an electrical appliance of 1000 watts when it is switched on for 60 minutes ?
Answer» (a) What is the meaning of the symbol kWh ? What quantity does it represent ? (b) How much electric energy in kWh is consumed by an electrical appliance of 1000 watts when it is switched on for 60 minutes ?

5239.

(a) What is the meaning of the symbol kWh ? What quantity does it represent ? (b) How much electric energy in kWh is consumed by an electrical appliance of 1000 watts when it is switched on for 60 minutes ?

Answer»

(a) What is the meaning of the symbol kWh ? What quantity does it represent ?

(b) How much electric energy in kWh is consumed by an electrical appliance of 1000 watts when it is switched on for 60 minutes ?

Discussion

5240.	A body goes from C to D with a velocity of 20 ms−1 and comes back from D to C with a velocity of 30 ms−1. The average velocity of the body during the whole journey is _______.
Answer» A body goes from C to D with a velocity of $20 m s^{- 1}$ and comes back from D to C with a velocity of $30 m s^{- 1}$ . The average velocity of the body during the whole journey is _______.

Discussion

5241.	14 An object thrown vertically up from the groundpasses the height 5 m twice in an interval of 10 sMIMWhat is its time of flight(2) \sqrt{86} s(1) \sqrt{28} s(4) \sqrt{72} s(3) \sqrt{104} s
Answer» 14 An object thrown vertically up from the groundpasses the height 5 m twice in an interval of 10 sMIMWhat is its time of flight(2) \sqrt{86} s(1) \sqrt{28} s(4) \sqrt{72} s(3) \sqrt{104} s

Discussion

5242.	A car covers a distance of 300 m in 20 seconds. Calculate the speed of the car.
Answer» A car covers a distance of 300 m in 20 seconds. Calculate the speed of the car.

Discussion

5243.	In which of the following cases a light ray suffers the maximum deviation while passing through pole?
Answer» In which of the following cases a light ray suffers the maximum deviation while passing through pole?

Discussion

5244.	what are the differences between resonance effect and hypercongugation
Answer» what are the differences between resonance effect and hypercongugation

Discussion

5245.	Describe the motion of the body which is accelerating at a constant rate of 10 m s-2 . If the body starts from the rest how much distance will it cover in 2 sec
Answer» Describe the motion of the body which is accelerating at a constant rate of 10 m s^-2_.If the body starts from the rest how much distance will it cover in 2 sec

Discussion

5246.	A body is thrown vertically upwards and takes 5 seconds to reach the maximum height. The distance travelled by body will be same in (A) 1st and 10th second (B) 2nd and 8th second (C) 4th and 6th second (D) both (b) and (c)
Answer» A body is thrown vertically upwards and takes 5 seconds to reach the maximum height. The distance travelled by body will be same in (A) 1st and 10th second (B) 2nd and 8th second (C) 4th and 6th second (D) both (b) and (c)

Discussion

5247.	A car is retarded by applying brakes at the rate of 2 m/s2 It is finally stopped in 10 s. Find its initial velocity.
Answer» A car is retarded by applying brakes at the rate of 2 m/ $s^{2}$ It is finally stopped in 10 s. Find its initial velocity.

Discussion

5248.	A boy shouts while standing between two walls. He heard two echoes with an interval of 0.25 s in between them. If he is 60m away from the farthest wall, how far away is he from the other wall? [speed of sound = 344 ms−1]
Answer» A boy shouts while standing between two walls. He heard two echoes with an interval of $0.25 s$ in between them. If he is $60 m$ away from the farthest wall, how far away is he from the other wall? [speed of sound $= 344 m s^{- 1}$ ]

5248.

A boy shouts while standing between two walls. He heard two echoes with an interval of 0.25 s in between them. If he is 60m away from the farthest wall, how far away is he from the other wall? [speed of sound = 344 ms−1]

Answer»

A boy shouts while standing between two walls. He heard two echoes with an interval of $0.25 s$ in between them. If he is $60 m$ away from the farthest wall, how far away is he from the other wall?
[speed of sound $= 344 m s^{- 1}$ ]

Discussion

5249.	A particle starts to move from rest with an acceleration of 4 ms2 for 4 seconds. Find the distance travelled in 4th second.
Answer» A particle starts to move from rest with an acceleration of 4 $\frac{m}{s^{2}}$ for 4 seconds. Find the distance travelled in $4^{t h}$ second.

Discussion

5250.	You lift a suitcase from the floor and keep it on a table. The work done by you on the suitcase depends on
Answer» You lift a suitcase from the floor and keep it on a table. The work done by you on the suitcase depends on

Discussion

Explore topic-wise InterviewSolutions in .

Four identical cells of emf E and internal resistance r are to be connected in series. Suppose if one of the cells is connected wrongly, the equivalent emf and effective internal resistance of the combination is:

Area under velocity time curve represents which physical quantity

The wavelength of maximum emitted energy of a body at 700 K is 4.08μm If the temperature of the body is raised to 1400 K, the wavelength of maximum emitted energy will be

119.A body of mass 6kg is moving with a velocity of 2m/s.calculate the force required to stop it in 5s. How for it will travel before coming to rest?

A solid sphere of mass M and radius R has to be disintegrated into infinite point masses at infinite separation. The work done for this process will be(G - universal gravitational constant)

30.4 charges are placed on a square A= q B= -2q C= +2q and D= -q. The side of the square is 10cm and q=1MC. What is the electric field intensity at the center of square

What are alternative fuels and why are they needed?

When light of frequency 2vo is incident on a metal plate

A particle is thrown vertically up such that distance travelled by it in 2 second and 9 second are same.Maximum height upto which particle rises is

45.For the figure shown mA=10kg mB=15kg & F=90N.Find the acceleration of the blocks & the frictional forces acting

Two bodies A and B of mass 150 gm and 250 gm are approaching towards each other. Both particles have a speed of 3 Ms per second find the magnitude of total linear momentum of the system of two particles

A car takes 4 hours to travel from Bangalore to Chennai, whereas the flight takes only 30 minutes to travel from Bangalore to Chennai. If the distance from Bangalore to Chennai by road is 400 km and by air is 150 km, find the average speed of flight and average speed of car in the same order.

A body is vibrating in the air, and sound is produced as a result. What happens when the rate of vibration of the object increases?

27. A body is projected vertically upwards fromground. If t, and t, be the times at which it isat height h above the projection whileascending and descending respectively, then h1S -(1) 5gt,42 (2) gt,t (3) 2gt,t (4) 2hg2

If action is equal to reaction then how is a horse able to pull a cart.

A fish in water(refractive index n) looks at a bird vertically above in the air. If y is the height of the bird and x is the depth of the fish from the surface, then the distance of the bird as estimated by the fish is?

A ball is thrown in xy plane undergoes a projectile with velocity u and angle theta with the horizontal. Draw the following graphs. X-t acc-t KE-h PE-hPE-t.

The jet engines of an aeroplane produces thrust which helps it to fly explain its working.

What is the meaning of- equipotential surfaces offer an alternative visual picture in addition to the picture of electric field lines around a charge configuration.

What would happen to the Earth, if the Sun suddenly vanishes? (Neglect the gravitational force due to other planets)

The weight of a body of mass 6.0 kg on the moon is 10 N. If a boy of mass 30 kg goes from earth to the moon surface,what will be his (a) mass, (b) weight ?

nt2000 small bulbs each weighing 1g each, strike 1 square cm of areaper sec with velocity =1000 and rebound with same velocity. find pressure on surfacen

Newton's third law says that every action has an equal and opposite reaction.this means that the force applied by sun on Earth and by Earth on sun will be equal.then why does sun does not revolve around Earth?why Earth revolves around sun?

A car is moving with a velocity of 80 m/s and it takes 20 s to stop after the brakes are applied. Calculate the force exerted by the brakes on the motorcar if its mass along with the passengers is 1000 kg.

Two objects of different masses falling freely near the surface of Moon from same height would

For the circuit shown in the figure below, answer the following questions: Would any of the bulb glow when the switch is in the ‘OFF’ position? What will be the order in which the bulb A, B, and C will glow when the switch is moved to the ‘ON’ position?

si unit of force

Name the characteristic of sound which can distinguish between the 'notes' (musical sounds) played the flute and a sitar (both the notes having the same pitch and loudness).

Myopia can be corrected using?

Calculate the mass of h20 which can be produced by using 44.8 l of h2 measured at ntp

what is velocity

What is meant by supersonic speed?

A sphere of iron and another of wood of the same radius are held under water. Compare the upthrust on the two spheres.

Mass × change in velocity = ___ × time interval. Fill in the blank:

The position of a body moving along x-axis at timet is given by x (t2 - 4t+6) m. The distancetravelled by body in time interval t = 0 tot 3 s is(1) 5 m(2) 7 m(3) 4 m(4) 3 m

(a) What is the meaning of the symbol kWh ? What quantity does it represent ? (b) How much electric energy in kWh is consumed by an electrical appliance of 1000 watts when it is switched on for 60 minutes ?

A body goes from C to D with a velocity of 20 ms−1 and comes back from D to C with a velocity of 30 ms−1. The average velocity of the body during the whole journey is _______.

14 An object thrown vertically up from the groundpasses the height 5 m twice in an interval of 10 sMIMWhat is its time of flight(2) \sqrt{86} s(1) \sqrt{28} s(4) \sqrt{72} s(3) \sqrt{104} s

A car covers a distance of 300 m in 20 seconds. Calculate the speed of the car.

In which of the following cases a light ray suffers the maximum deviation while passing through pole?

what are the differences between resonance effect and hypercongugation

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

A body is thrown vertically upwards and takes 5 seconds to reach the maximum height. The distance travelled by body will be same in (A) 1st and 10th second (B) 2nd and 8th second (C) 4th and 6th second (D) both (b) and (c)

A car is retarded by applying brakes at the rate of 2 m/s2 It is finally stopped in 10 s. Find its initial velocity.

A boy shouts while standing between two walls. He heard two echoes with an interval of 0.25 s in between them. If he is 60m away from the farthest wall, how far away is he from the other wall? [speed of sound = 344 ms−1]

A particle starts to move from rest with an acceleration of 4 ms2 for 4 seconds. Find the distance travelled in 4th second.

You lift a suitcase from the floor and keep it on a table. The work done by you on the suitcase depends on

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