9478 + Interview Questions in Physics Page 24 InterviewSolution

1151.	A ray OA is incident upon a smooth surface POQ. It is reflected back along OB, a normal ON is drawn perpendicular to the surface at O (the point of incidence) and the value of ∠AOP is 60∘. Find the value of x in degrees.30
Answer» A ray $OA$ is incident upon a smooth surface $POQ$ . It is reflected back along $OB$ , a normal $ON$ is drawn perpendicular to the surface at $O$ (the point of incidence) and the value of $∠ AOP$ is $60^{\circ}$ . Find the value of $x$ in degrees. 30

1151.

A ray OA is incident upon a smooth surface POQ. It is reflected back along OB, a normal ON is drawn perpendicular to the surface at O (the point of incidence) and the value of ∠AOP is 60∘. Find the value of x in degrees.30

Answer»

A ray

OA

is incident upon a smooth surface

POQ

. It is reflected back along

OB

, a normal

ON

is drawn perpendicular to the surface at

O

(the point of incidence) and the value of

∠ AOP

is

60^{\circ}

. Find the value of

x

in degrees.

30

Discussion

1152.	If we have two liquids having the density D1 and D2 such that one is greater than the true if the mass of the liquid m1 and m2 then m1 is greater than m 2 if the volume is same but what if m2 has greater volume then and which will bigger m1 or m2?
Answer» If we have two liquids having the density D1 and D2 such that one is greater than the true if the mass of the liquid m1 and m2 then m1 is greater than m 2 if the volume is same but what if m2 has greater volume then and which will bigger m1 or m2?

Discussion

1153.	When you use the hollow side of a hollow sphere to make reflections you get a ___ mirror.
Answer» When you use the hollow side of a hollow sphere to make reflections you get a ___ mirror.

Discussion

1154.	A screw gauge has a pitch of 1 mm. What should be the number of divisions on its head so that the smallest measurement that can be made using this is 0.001 cm?
Answer» A screw gauge has a pitch of 1 mm. What should be the number of divisions on its head so that the smallest measurement that can be made using this is 0.001 cm?

Discussion

1155.	a particle moving along x axis is given by t=3-sqrt x.The particle will be found a rest at t equal to
Answer» a particle moving along x axis is given by t=3-sqrt x.The particle will be found a rest at t equal to

Discussion

1156.	If 300 joules of work is required to transfer 30 coulombs of charge, then the potential difference between two ends of battery is
Answer» If 300 joules of work is required to transfer 30 coulombs of charge, then the potential difference between two ends of battery is

Discussion

1157.	The density of mercury is 13.6×103kgm−3. The mass of 1cm3 of mercury is:
Answer» The density of mercury is $13.6 \times 10^{3} k g m^{- 3}$ . The mass of $1 c m^{3}$ of mercury is:

Discussion

1158.	Calculate the depth at which pressure on a swimmer is 100 Pa. Given, density of water = 1000 kg/m³
Answer» Calculate the depth at which pressure on a swimmer is 100 Pa. Given, density of water = 1000 kg/m³

1158.

Calculate the depth at which pressure on a swimmer is 100 Pa. Given, density of water = 1000 kg/m³

Answer»

Calculate the depth at which pressure on a swimmer is 100 Pa. Given, density of water = 1000 kg/m³

Discussion

1159.	A vehicle spends an energy of 4000 J while moving at a constant speed of 10 ms−1. What is the mass of the vehicle?
Answer» A vehicle spends an energy of 4000 J while moving at a constant speed of $10 m s^{- 1}$ . What is the mass of the vehicle?

Discussion

1160.	Why is soap is slippery?
Answer» Why is soap is slippery?

Discussion

1161.	Halley's comet is seen after how many years?
Answer» Halley's comet is seen after how many years?

Discussion

1162.	Which of the following statement is correct?
Answer» Which of the following statement is correct?

Discussion

1163.	a train is moving along a straight line witha cons†an t acceleration a. a boy s†an ding in the train throws a ball forward witha speed of 10m/s at an angle of 60 degree to the horizontal. the boy has to move forward by 1.15 m inside the train to catch the ball back at the initial height. the accelelartion of the train in m/s2
Answer» a train is moving along a straight line witha cons†an t acceleration a. a boy s†an ding in the train throws a ball forward witha speed of 10m/s at an angle of 60 degree to the horizontal. the boy has to move forward by 1.15 m inside the train to catch the ball back at the initial height. the accelelartion of the train in m/s2

Discussion

1164.	How can you identify conductors and insulators using an electroscope?
Answer» How can you identify conductors and insulators using an electroscope?

Discussion

1165.	List the properties of magnetic lines of forces.
Answer» List the properties of magnetic lines of forces.

Discussion

1166.	A wave execute SHM with maximum particle velocity Vm. If displacement is 3/5 times the amplitude then particle velocity is how much
Answer» A wave execute SHM with maximum particle velocity Vm. If displacement is 3/5 times the amplitude then particle velocity is how much

Discussion

1167.	The relation between focal length F magnification m and image distance v of a spherical mirror of small aperture is given by
Answer» The relation between focal length F magnification m and image distance v of a spherical mirror of small aperture is given by

Discussion

1168.	The amount of zinc required to produce 1.12 ml of H2 at STP on treatment with dilute HCL will be
Answer» The amount of zinc required to produce 1.12 ml of H2 at STP on treatment with dilute HCL will be

Discussion

1169.	15.Consider a pot fully filled with water having height H. the bottom of the pot is a reflecting surface. S is a small fish and T is the human eye.T is at the height of H from the water surface. Refractive index is u. a) At what distance(s) from itself will the fish see the image(s) of the eye? b) At what distance(s) from itself will the eye see the image(s) of the fish?
Answer» 15.Consider a pot fully filled with water having height H. the bottom of the pot is a reflecting surface. S is a small fish and T is the human eye.T is at the height of H from the water surface. Refractive index is u. a) At what distance(s) from itself will the fish see the image(s) of the eye? b) At what distance(s) from itself will the eye see the image(s) of the fish?

Discussion

1170.	Name all the planets of the solar system in the order of their increasing distances from the sun.
Answer» Name all the planets of the solar system in the order of their increasing distances from the sun.

Discussion

1171.	A BLOCK IS LYING STATIC FRICTION ON THE FLOOR .THE MAX VALUE OF STATIC FRICTIONAL FORCE ON THE BLOCK IS 10 N .IF A HORIZONTAL FORCE OF 6 N IS APPLIED TO THE BLOCK ,WHAT BE WILL BE THE FRICTIONAL FORCE ON THE BLOCK?
Answer» A BLOCK IS LYING STATIC FRICTION ON THE FLOOR .THE MAX VALUE OF STATIC FRICTIONAL FORCE ON THE BLOCK IS 10 N .IF A HORIZONTAL FORCE OF 6 N IS APPLIED TO THE BLOCK ,WHAT BE WILL BE THE FRICTIONAL FORCE ON THE BLOCK?

Discussion

1172.	The activity of removing the charge on a body is called ___
Answer» The activity of removing the charge on a body is called ___

Discussion

1173.	Identify the factors that affect the process of evaporation.
Answer» Identify the factors that affect the process of evaporation.

Discussion

1174.	Alloys are used in electrical heating devices rather than pure metals. Give one reason.
Answer» Alloys are used in electrical heating devices rather than pure metals. Give one reason.

Discussion

1175.	If the earth rotates from the west to the east, why do the sun and stars move from the east towards the west?
Answer» If the earth rotates from the west to the east, why do the sun and stars move from the east towards the west?

Discussion

1176.	How many images of an object will be formed when the object is placed between two plane mirrors which are inclined at the following angles to one another? (a) 120∘ (b) 45∘ (c) 180∘ (d) 60∘ (e) 90∘
Answer» How many images of an object will be formed when the object is placed between two plane mirrors which are inclined at the following angles to one another? (a) $120^{\circ}$ (b) $45^{\circ}$ (c) $180^{\circ}$ (d) $60^{\circ}$ (e) $90^{\circ}$

1176.

How many images of an object will be formed when the object is placed between two plane mirrors which are inclined at the following angles to one another? (a) 120∘ (b) 45∘ (c) 180∘ (d) 60∘ (e) 90∘

Answer»

How many images of an object will be formed when the object is placed between two plane mirrors which are inclined at the following angles to one another?

(a) $120^{\circ}$ (b) $45^{\circ}$ (c) $180^{\circ}$ (d) $60^{\circ}$ (e) $90^{\circ}$

Discussion

1177.	40. Calculate the electric field Intensity at any point an electric dipole
Answer» 40. Calculate the electric field Intensity at any point an electric dipole

Discussion

1178.	Prove that 5 is a irrational number.
Answer» Prove that 5 is a irrational number.

Discussion

1179.	in medium of refractive index 1.6 and having a concax surface has a point object in it at a dis†an ce of 12 cm from the pole. the radius of curvanture is 6cm .located the image as seen from air 1)a real image at 30cm2)a virtual omage at 30cm3)a real image at 4.28cm4)a virtual image at 4.28 c
Answer» in medium of refractive index 1.6 and having a concax surface has a point object in it at a dis†an ce of 12 cm from the pole. the radius of curvanture is 6cm .located the image as seen from air 1)a real image at 30cm2)a virtual omage at 30cm3)a real image at 4.28cm4)a virtual image at 4.28 c

Discussion

1180.	A spring of force constant k is cut into two pieces whose lengths are in the ratio 1:2. What is the force constant of the loner piece? k/2 3k / 2 2k 3k
Answer» A spring of force constant k is cut into two pieces whose lengths are in the ratio 1:2. What is the force constant of the loner piece? k/2 3k / 2 2k 3k

Discussion

1181.	Question 13 Why do we hear the sound produced by the humming bees while the sound of vibrations of pendulum is not heard?
Answer» Question 13 Why do we hear the sound produced by the humming bees while the sound of vibrations of pendulum is not heard?

Discussion

1182.	Is friction related to gravity ?
Answer» Is friction related to gravity ?

Discussion

1183.	Calculate the volume of copper of mass 2000 kg when it's density is 8.4 g/cc.
Answer» Calculate the volume of copper of mass 2000 kg when it's density is 8.4 g/cc.

Discussion

1184.	101.A 600kg rocket is set for a vertical firing .If the exhaust speee is 1000ms-1 the mass of the gas ejected per second to supply the thrust needed to overcome the weight of rocket is 1)117.6kgs-1. 2)58.6kgs-1. 3)6Kgs-1. 4)76.4kgs-1
Answer» 101.A 600kg rocket is set for a vertical firing .If the exhaust speee is 1000ms-1 the mass of the gas ejected per second to supply the thrust needed to overcome the weight of rocket is 1)117.6kgs-1. 2)58.6kgs-1. 3)6Kgs-1. 4)76.4kgs-1

Discussion

1185.	What is cataract? Explain with diagram. How is it treated? Mention two causes. Each point: 1 Mark Diagram: 2 Marks
Answer» What is cataract? Explain with diagram. How is it treated? Mention two causes. Each point: 1 Mark Diagram: 2 Marks

1185.

What is cataract? Explain with diagram. How is it treated? Mention two causes. Each point: 1 Mark Diagram: 2 Marks

Answer»

What is cataract? Explain with diagram. How is it treated? Mention two causes.

Each point: 1 Mark
Diagram: 2 Marks

Discussion

1186.	The following observations were takerdetermining surface tension T of water bycapillary methoddiameter of capillary, D = 1.25 x 10-2 mrise of water, h 1.45 10 mUsing g 9.80 m/s2 and the simplifiedrelation T = mg 103 N/ m、the possible errorin surface tension is closest to(1) 2.4%(3) 0.15%2(2)(4)10%1.5%
Answer» The following observations were takerdetermining surface tension T of water bycapillary methoddiameter of capillary, D = 1.25 x 10-2 mrise of water, h 1.45 10 mUsing g 9.80 m/s2 and the simplifiedrelation T = mg 103 N/ m、the possible errorin surface tension is closest to(1) 2.4%(3) 0.15%2(2)(4)10%1.5%

Discussion

1187.	Electrodes are immersed in water and electric current is passed through it. Which of the following statements is correct?
Answer» Electrodes are immersed in water and electric current is passed through it. Which of the following statements is correct?

Discussion

1188.	List three ways of reducing friction.
Answer» List three ways of reducing friction.

Discussion

1189.	A stone is dropped from a rising balloon at a height of 76m above the ground and reaches the ground in 6 seconds. What was the velocity of the balloon when the stone was dropped
Answer» A stone is dropped from a rising balloon at a height of 76m above the ground and reaches the ground in 6 seconds. What was the velocity of the balloon when the stone was dropped

Discussion

1190.	A satellite can be in a geostationary orbit around earth at adis†an ce r from acentre. if angular velocityof earth about its axis doubles, a satellite can now be in a geostationary orbit around earth if its dis†an ce from centre is
Answer» A satellite can be in a geostationary orbit around earth at adis†an ce r from acentre. if angular velocityof earth about its axis doubles, a satellite can now be in a geostationary orbit around earth if its dis†an ce from centre is

Discussion

1191.	What happens when we touch the metal top of a charged electroscope with our finger ? What is this process known as ?
Answer» What happens when we touch the metal top of a charged electroscope with our finger ? What is this process known as ?

Discussion

1192.	The radius of the orbit of a geosynchronous sateiliteis 36000 km. Then the period of revolution of a satellite with its orbital radius 9000 km would be
Answer» The radius of the orbit of a geosynchronous sateiliteis 36000 km. Then the period of revolution of a satellite with its orbital radius 9000 km would be

Discussion

1193.	ntA body falling freely from rest covers 7/16 of the total height in last second of its fall.the height from which it falls isn
Answer» ntA body falling freely from rest covers 7/16 of the total height in last second of its fall.the height from which it falls isn

Discussion

1194.	A hollow circular shaft of inner radius 10 mm outer radius 20 mm and length 1 m is to be used as a torsional spring. If the shear modulus of the material of the shaft is 150 GPa, the torsional stiffness of the shaft (in kN-m/rad) is _______ (correct to two decimal places).35.343
Answer» A hollow circular shaft of inner radius 10 mm outer radius 20 mm and length 1 m is to be used as a torsional spring. If the shear modulus of the material of the shaft is 150 GPa, the torsional stiffness of the shaft (in kN-m/rad) is _______ (correct to two decimal places). 35.343

Discussion

1195.	Which thermometer is used to measure the extreme temperatures of the day reported in a newspaper?
Answer» Which thermometer is used to measure the extreme temperatures of the day reported in a newspaper?

Discussion

1196.	A RC beam of cross section 420mm×600mm is subjected to a shear force of 100 kN and torsional moment of 40 kNm under working condition. The design equivalent shear force in the beam as per LSM, will be _______ kN. 378.57
Answer» A RC beam of cross section $420 m m \times 600 m m$ is subjected to a shear force of 100 kN and torsional moment of 40 kNm under working condition. The design equivalent shear force in the beam as per LSM, will be _______ kN. 378.57

Discussion

1197.	Asteel cable with a radius of 1.5 cm supports a chairlift at a skiarea. If the maximum stress is not to exceed 108N m–2,what is the maximum load the cable can support?
Answer» A steel cable with a radius of 1.5 cm supports a chairlift at a ski area. If the maximum stress is not to exceed 10⁸N m^–2, what is the maximum load the cable can support?

Discussion

1198.	80.Velocity of sound in air at o degree celcius is 332m/s covert it into km/hour
Answer» 80.Velocity of sound in air at o degree celcius is 332m/s covert it into km/hour

Discussion

1199.	Why do planets do not seems to twinkle as the stars seems to twinkle only because of the air current ?
Answer» Why do planets do not seems to twinkle as the stars seems to twinkle only because of the air current ?

Discussion

1200.	A: During collision between two objects, themomentum of colliding objects is conservedonly in direction perpendicular to line ofimpact.R The force on colliding objects in directionperpendicular to line of impact is zero.
Answer» A: During collision between two objects, themomentum of colliding objects is conservedonly in direction perpendicular to line ofimpact.R The force on colliding objects in directionperpendicular to line of impact is zero.

Discussion

Explore topic-wise InterviewSolutions in .

A ray OA is incident upon a smooth surface POQ. It is reflected back along OB, a normal ON is drawn perpendicular to the surface at O (the point of incidence) and the value of ∠AOP is 60∘. Find the value of x in degrees.30

If we have two liquids having the density D1 and D2 such that one is greater than the true if the mass of the liquid m1 and m2 then m1 is greater than m 2 if the volume is same but what if m2 has greater volume then and which will bigger m1 or m2?

When you use the hollow side of a hollow sphere to make reflections you get a ___ mirror.

A screw gauge has a pitch of 1 mm. What should be the number of divisions on its head so that the smallest measurement that can be made using this is 0.001 cm?

a particle moving along x axis is given by t=3-sqrt x.The particle will be found a rest at t equal to

If 300 joules of work is required to transfer 30 coulombs of charge, then the potential difference between two ends of battery is

The density of mercury is 13.6×103kgm−3. The mass of 1cm3 of mercury is:

Calculate the depth at which pressure on a swimmer is 100 Pa. Given, density of water = 1000 kg/m³

A vehicle spends an energy of 4000 J while moving at a constant speed of 10 ms−1. What is the mass of the vehicle?

Why is soap is slippery?

Halley's comet is seen after how many years?

Which of the following statement is correct?

How can you identify conductors and insulators using an electroscope?

List the properties of magnetic lines of forces.

A wave execute SHM with maximum particle velocity Vm. If displacement is 3/5 times the amplitude then particle velocity is how much

The relation between focal length F magnification m and image distance v of a spherical mirror of small aperture is given by

The amount of zinc required to produce 1.12 ml of H2 at STP on treatment with dilute HCL will be

Name all the planets of the solar system in the order of their increasing distances from the sun.

A BLOCK IS LYING STATIC FRICTION ON THE FLOOR .THE MAX VALUE OF STATIC FRICTIONAL FORCE ON THE BLOCK IS 10 N .IF A HORIZONTAL FORCE OF 6 N IS APPLIED TO THE BLOCK ,WHAT BE WILL BE THE FRICTIONAL FORCE ON THE BLOCK?

The activity of removing the charge on a body is called ___

Identify the factors that affect the process of evaporation.

Alloys are used in electrical heating devices rather than pure metals. Give one reason.

If the earth rotates from the west to the east, why do the sun and stars move from the east towards the west?

How many images of an object will be formed when the object is placed between two plane mirrors which are inclined at the following angles to one another? (a) 120∘ (b) 45∘ (c) 180∘ (d) 60∘ (e) 90∘

40. Calculate the electric field Intensity at any point an electric dipole

Prove that 5 is a irrational number.

in medium of refractive index 1.6 and having a concax surface has a point object in it at a dis†an ce of 12 cm from the pole. the radius of curvanture is 6cm .located the image as seen from air 1)a real image at 30cm2)a virtual omage at 30cm3)a real image at 4.28cm4)a virtual image at 4.28 c

A spring of force constant k is cut into two pieces whose lengths are in the ratio 1:2. What is the force constant of the loner piece? k/2 3k / 2 2k 3k

Question 13 Why do we hear the sound produced by the humming bees while the sound of vibrations of pendulum is not heard?

Is friction related to gravity ?

Calculate the volume of copper of mass 2000 kg when it's density is 8.4 g/cc.

101.A 600kg rocket is set for a vertical firing .If the exhaust speee is 1000ms-1 the mass of the gas ejected per second to supply the thrust needed to overcome the weight of rocket is 1)117.6kgs-1. 2)58.6kgs-1. 3)6Kgs-1. 4)76.4kgs-1

What is cataract? Explain with diagram. How is it treated? Mention two causes. Each point: 1 Mark Diagram: 2 Marks

Electrodes are immersed in water and electric current is passed through it. Which of the following statements is correct?

List three ways of reducing friction.

A stone is dropped from a rising balloon at a height of 76m above the ground and reaches the ground in 6 seconds. What was the velocity of the balloon when the stone was dropped

A satellite can be in a geostationary orbit around earth at adis†an ce r from acentre. if angular velocityof earth about its axis doubles, a satellite can now be in a geostationary orbit around earth if its dis†an ce from centre is

What happens when we touch the metal top of a charged electroscope with our finger ? What is this process known as ?

The radius of the orbit of a geosynchronous sateiliteis 36000 km. Then the period of revolution of a satellite with its orbital radius 9000 km would be

ntA body falling freely from rest covers 7/16 of the total height in last second of its fall.the height from which it falls isn

A hollow circular shaft of inner radius 10 mm outer radius 20 mm and length 1 m is to be used as a torsional spring. If the shear modulus of the material of the shaft is 150 GPa, the torsional stiffness of the shaft (in kN-m/rad) is _______ (correct to two decimal places).35.343

Which thermometer is used to measure the extreme temperatures of the day reported in a newspaper?

A RC beam of cross section 420mm×600mm is subjected to a shear force of 100 kN and torsional moment of 40 kNm under working condition. The design equivalent shear force in the beam as per LSM, will be _______ kN. 378.57

Asteel cable with a radius of 1.5 cm supports a chairlift at a skiarea. If the maximum stress is not to exceed 108N m–2,what is the maximum load the cable can support?

80.Velocity of sound in air at o degree celcius is 332m/s covert it into km/hour

Why do planets do not seems to twinkle as the stars seems to twinkle only because of the air current ?

A: During collision between two objects, themomentum of colliding objects is conservedonly in direction perpendicular to line ofimpact.R The force on colliding objects in directionperpendicular to line of impact is zero.