9478 + Interview Questions in Physics Page 20 InterviewSolution

951.	If the maximum speed of a particle on a travelling sinusoidal wave is v0 , then find the speed of a particle when the displacement is half of the maximum value.
Answer» If the maximum speed of a particle on a travelling sinusoidal wave is $v_{0}$ , then find the speed of a particle when the displacement is half of the maximum value.

Discussion

952.	Define Rolling friction
Answer» Define Rolling friction

Discussion

953.	An oil – tanker explodes in the sea. At that instant an aircraft and a submarine were present vertically above and below the oil – tanker respectively at equal distances from it. Find the ratio of the time taken by sound waves to reach them. (Speed of sound in air = 340 m/s. Speed of sound in sea water = 1520 m/s)
Answer» An oil – tanker explodes in the sea. At that instant an aircraft and a submarine were present vertically above and below the oil – tanker respectively at equal distances from it. Find the ratio of the time taken by sound waves to reach them. (Speed of sound in air = 340 m/s. Speed of sound in sea water = 1520 m/s)

Discussion

954.	If a body tied to a spring balance is fully immersed in a liquid, the apparent loss in its weight :(1) is more in a denser liquid(2) is less in a denser liquid(3) does not depend on density of liquid(4) is equal to apparent gain in weight of liquid
Answer» If a body tied to a spring balance is fully immersed in a liquid, the apparent loss in its weight : (1) is more in a denser liquid (2) is less in a denser liquid (3) does not depend on density of liquid (4) is equal to apparent gain in weight of liquid

Discussion

955.	25. In the figure shown acceleration of 1 is x (upward) acceleration of pulley p3 wrt pulley p2 is y ( downward) and acceleration of 4 wrt pulley p3 is z (upward) then absolute acceleration of 2
Answer» 25. In the figure shown acceleration of 1 is x (upward) acceleration of pulley p3 wrt pulley p2 is y ( downward) and acceleration of 4 wrt pulley p3 is z (upward) then absolute acceleration of 2

Discussion

956.	13. Number of atoms in 1 ml of ammonia gas at STP is(1) 2.7 \ast 1019(2) 1.08 1020(3) 10.8 x 1020(4) 5.4 x 1019
Answer» 13. Number of atoms in 1 ml of ammonia gas at STP is(1) 2.7 \ast 1019(2) 1.08 1020(3) 10.8 x 1020(4) 5.4 x 1019

Discussion

957.	Light ray travels in a
Answer» Light ray travels in a

Discussion

958.	Sound travels in air at 340 m/s. In air, a sound source is producing a sound wave of wavelength 34 cm. Find the time period of this sound wave.
Answer» Sound travels in air at $340 m/s$ . In air, a sound source is producing a sound wave of wavelength $34 cm$ . Find the time period of this sound wave.

Discussion

959.	When light goes from an optically rarer to an optically denser medium,
Answer» When light goes from an optically rarer to an optically denser medium,

Discussion

960.	Write the difference between conductor and insulator.
Answer» Write the difference between conductor and insulator.

Discussion

961.	73.A CAR TRAVELLING AT 36 KM/H IN 5 SECONDS.WHAT IS THE ACCELERATION.? IF THE SAME CAR STOPS IN 20 SECONDS , WHAT IS THE RETARDATION ?
Answer» 73.A CAR TRAVELLING AT 36 KM/H IN 5 SECONDS.WHAT IS THE ACCELERATION.? IF THE SAME CAR STOPS IN 20 SECONDS , WHAT IS THE RETARDATION ?

Discussion

962.	A car moving with initial velocity of 10 ms−1 attains a speed, v in 5 seconds. The car travels a distance of 100 m. Find v.
Answer» A car moving with initial velocity of $10 m s^{- 1}$ attains a speed, v in 5 seconds. The car travels a distance of 100 m. Find v.

Discussion

963.	what is vander waals force of attraction
Answer» what is vander waals force of attraction

Discussion

964.	If we have two gear wheels of the same size, one of which rotates once around the other,which is stationary,how often will the first one turn around its own axle?
Answer» If we have two gear wheels of the same size, one of which rotates once around the other,which is stationary,how often will the first one turn around its own axle?

Discussion

965.	If the mass of a body is 5 kg, its weight on the surface of the earth would be ___. [Take acceleration due to gravity, g=9.8 ms−2]
Answer» If the mass of a body is $5 k g,$ its weight on the surface of the earth would be ___. [Take acceleration due to gravity, $g = 9.8 m s^{- 2}]$

Discussion

966.	A person is standing 1 km away from a source of sound. If the velocity of sound in the medium is 340 m/s, then calculate the number of oscillations (approximately) that the particles near the source complete before the sound wave reaches that person. The frequency of the sound is 500 Hz.
Answer» A person is standing 1 km away from a source of sound. If the velocity of sound in the medium is 340 m/s, then calculate the number of oscillations (approximately) that the particles near the source complete before the sound wave reaches that person. The frequency of the sound is 500 Hz.

Discussion

967.	How many moles of FeC2O4 are required to react completely with one equivalent of K2Cr2O7 in acidic medium
Answer» How many moles of FeC2O4 are required to react completely with one equivalent of K2Cr2O7 in acidic medium

Discussion

968.

Complete the following tables. Mass(Kg) Volume (m3)Density(kg/m3) 350 175 - - 190 4 Density of Metal (kg/m3) Density of water (kg/m3) Relative Density 103 5 8.5×103 103 - weight(N) Area (m2)Pressure(Nm−2) - 0.04 20,000 1500 500 -

Answer»

Complete the following tables.

Mass(Kg)	Volume (m³)	Density(kg/m³)
350	175	-
-	190	4

Density of Metal (kg/m³)	Density of water (kg/m³)	Relative Density
	10³	5
8.5×10³	10³	-

weight(N)	Area (m²)	Pressure(Nm⁻²)
-	0.04	20,000
1500	500	-

Discussion

969.	A beaker contains 200gm of water. The heat capacity of the beaker is equal to that of 20gm of water. The initial temperature of water in the beaker is 20∘C. If 440gm of hot water at 92∘C is poured into it, the final temperature od the system is
Answer» A beaker contains $200 g m$ of water. The heat capacity of the beaker is equal to that of $20 g m$ of water. The initial temperature of water in the beaker is $20^{\circ} C .$ If $440 g m$ of hot water at $92^{\circ} C$ is poured into it, the final temperature od the system is

Discussion

970.	In the first stanza, find words that show (i) that it was very cold. (ii) that it was late evening. (iii) that the traveller was alone.
Answer» In the first stanza, find words that show (i) that it was very cold. (ii) that it was late evening. (iii) that the traveller was alone.

970.

In the first stanza, find words that show (i) that it was very cold. (ii) that it was late evening. (iii) that the traveller was alone.

Answer»

In the
first stanza, find words that show

(i) that
it was very cold.

(ii) that
it was late evening.

(iii) that
the traveller was alone.

Discussion

971.	In which state of matter does sound travel the a) Slowestb) Fastest
Answer» In which state of matter does sound travel the a) Slowest b) Fastest

Discussion

972.	Which has a higher value- the sliding friction order static friction
Answer» Which has a higher value- the sliding friction order static friction

Discussion

973.	There is a non conducting rod of length L of negligible mass with two small balls each of mass m and electric charge Q attached to its ends. The rod can rotate in a horizontal plane about a fixed vertical axis crossing it a distance L/4 from one of its ends. In what position the rod must be set so that if displaced a little from that position, it begins simple harmonic oscillations ? What would be the angular frequency of SHM then?
Answer» There is a non conducting rod of length L of negligible mass with two small balls each of mass m and electric charge Q attached to its ends. The rod can rotate in a horizontal plane about a fixed vertical axis crossing it a distance L/4 from one of its ends. In what position the rod must be set so that if displaced a little from that position, it begins simple harmonic oscillations ? What would be the angular frequency of SHM then?

Discussion

974.	Describe an experiment to determine the density of a liquid.
Answer» Describe an experiment to determine the density of a liquid.

Discussion

975.	20.Let Rs and Rm be the distance of the geostationary satellite and moon from the centre of the earth. Then Rm/Rsis (1) (29)power 1/2 (2) (29)power 2/3 (3) 29 (4) (29)power 3/2
Answer» 20.Let Rs and Rm be the distance of the geostationary satellite and moon from the centre of the earth. Then Rm/Rsis (1) (29)power 1/2 (2) (29)power 2/3 (3) 29 (4) (29)power 3/2

Discussion

976.	What should be the angle between two plane mirrors so that whatever be the angle of incidence, the incident ray and the reflected ray from the two mirrors be parallel to each other. A)600 B)900 C)1200 D)1750
Answer» What should be the angle between two plane mirrors so that whatever be the angle of incidence, the incident ray and the reflected ray from the two mirrors be parallel to each other. A)60⁰ B)90⁰ C)120⁰ D)175⁰

Discussion

977.	Calculate the pressure developed by a force of 50 N acting on an area of 10 m2.
Answer» Calculate the pressure developed by a force of $50 N$ acting on an area of ${10 m}^{2}$ .

Discussion

978.	Metal are good conductors of ___ .
Answer» Metal are good conductors of ___ .

Discussion

979.	Ball bearing is a device which usually converts: (a) rolling friction into sliding friction (b) static friction into sliding friction (c) sliding friction into rolling friction (d) rolling friction into static friction
Answer» Ball bearing is a device which usually converts: (a) rolling friction into sliding friction (b) static friction into sliding friction (c) sliding friction into rolling friction (d) rolling friction into static friction

Discussion

980.	3 moles of NO and 24g of O_2 at 27^0C in a closed container of b=volume 9.0 L are allowed to react to produce maximum quantity of NO_2. What is the change in pressure in atmosphere? \lbrack Use R=0.082 L atm^{-1} K^{-1}\rbrack (1) 1.50 atm (2) 3.00 atm (3) 0.75 atm (4) 2.05 atm
Answer» 3 moles of NO and 24g of O_2 at 27^0C in a closed container of b=volume 9.0 L are allowed to react to produce maximum quantity of NO_2. What is the change in pressure in atmosphere? \lbrack Use R=0.082 L atm^{-1} K^{-1}\rbrack (1) 1.50 atm (2) 3.00 atm (3) 0.75 atm (4) 2.05 atm

Discussion

981.	Electric flux through the ring is
Answer» Electric flux through the ring is

Discussion

982.	What is amine inversion?
Answer» What is amine inversion?

Discussion

983.	A 1000 kg engine pulls a train of 4 wagons each of 2500 kg along a horizontal railway track.If the engine exerts a force of 50000N on wagons and track offers force of friction 10000N then calculate The force by wagon 1 on wagon 2?
Answer» A 1000 kg engine pulls a train of 4 wagons each of 2500 kg along a horizontal railway track.If the engine exerts a force of 50000N on wagons and track offers force of friction 10000N then calculate The force by wagon 1 on wagon 2?

Discussion

984.	why one cannot pull a cart without touching it ?
Answer» why one cannot pull a cart without touching it ?

Discussion

985.	Why two like charges repell each other?
Answer» Why two like charges repell each other?

Discussion

986.	What are acceleration, displacement, velocity and speed formulas?
Answer» What are acceleration, displacement, velocity and speed formulas?

Discussion

987.	How would you increase the conductivity of lemon juice?
Answer» How would you increase the conductivity of lemon juice?

Discussion

988.	What will happen if the strip loses its flexibility?
Answer» What will happen if the strip loses its flexibility?

Discussion

989.	Imagine that friction suddenly vanishes. How would life be affected? List ten such situations.
Answer» Imagine that friction suddenly vanishes. How would life be affected? List ten such situations.

Discussion

990.	By virtue of mutual attraction between gravitational force two particles of mass m go round on a circle of radius r. the speed of either of the particle is
Answer» By virtue of mutual attraction between gravitational force two particles of mass m go round on a circle of radius r. the speed of either of the particle is

Discussion

991.	Which of the following is not a fundamental/basic unit of measurement?
Answer» Which of the following is not a fundamental/basic unit of measurement?

Discussion

992.	How are permanent magnets made?
Answer» How are permanent magnets made?

Discussion

993.	Two pendulums have time periods T and 5T4. They start oscillating in SHM at the same time from the mean position. After how many oscillations of the smaller pendulum they will be again in the same phase ?
Answer» Two pendulums have time periods $T$ and $\frac{5 T}{4}$ . They start oscillating in SHM at the same time from the mean position. After how many oscillations of the smaller pendulum they will be again in the same phase ?

Discussion

994.	Find the thrust on ground due to a rectangular block of mass 3kg lying on the ground.
Answer» Find the thrust on ground due to a rectangular block of mass 3kg lying on the ground.

Discussion

995.	How should one take the reading with a laboratory thermometer?
Answer» How should one take the reading with a laboratory thermometer?

Discussion

996.	Squeezing a piece of lemon in between the fingers is an example of
Answer» Squeezing a piece of lemon in between the fingers is an example of

Discussion

997.	A convex lens and a covex mirror are seperated by a dis†an ce of 10cm such that the reflecting surface of the mirror faces the lens .The image of an object placed in front of the convex lens at a dis†an ce of 20cm is found to coincide with the object If the focal length of the convex lens is 15cm determine the length of the mirror?
Answer» A convex lens and a covex mirror are seperated by a dis†an ce of 10cm such that the reflecting surface of the mirror faces the lens .The image of an object placed in front of the convex lens at a dis†an ce of 20cm is found to coincide with the object If the focal length of the convex lens is 15cm determine the length of the mirror?

Discussion

998.

Fill in the following blanks with suitable words: (a) Sounds are produced by _objects. (b) The human voice box is called_ (c) Sound cannot travel in_ (d) A set of three _tiny in the middle part of ear passes on sound vibrations from the eardrum to the liquid in cochlea. (e) The unit of frequency is_ (f) The timet taken by an object to complete one oscillation is called _ (g) The shrillness of a sound is determined by the_ of vibration. (h) Unpleasant sound is called_ (i) Sound which is pleasing to the era is called_ sound (j) A person having partial hearing loss can hear properly by wearing a device called hearing_ on the ear.

Answer»

Fill in the following blanks with suitable words:

(a) Sounds are produced by ___objects.

(b) The human voice box is called___

(c) Sound cannot travel in___

(d) A set of three ___tiny in the middle part of ear passes on sound vibrations from the eardrum to the liquid in cochlea.

(e) The unit of frequency is___

(f) The timet taken by an object to complete one oscillation is called ___

(g) The shrillness of a sound is determined by the___ of vibration.

(h) Unpleasant sound is called___

(i) Sound which is pleasing to the era is called___ sound

(j) A person having partial hearing loss can hear properly by wearing a device called hearing___ on the ear.

Discussion

999.	One light year is _________.
Answer» One light year is _________.

Discussion

1000.	Explain the function of the following parts of the human eye:- 1) Sclera 2) Cornea 3) Iris 4) Pupil 5) Crystalline lens 6) Aqueous Humor 7) Vitreous Humor 8) Ciliary Muscles 9) Retina 10) Optic Nerve
Answer» Explain the function of the following parts of the human eye:- 1) Sclera 2) Cornea 3) Iris 4) Pupil 5) Crystalline lens 6) Aqueous Humor 7) Vitreous Humor 8) Ciliary Muscles 9) Retina 10) Optic Nerve

Discussion

Explore topic-wise InterviewSolutions in .

If the maximum speed of a particle on a travelling sinusoidal wave is v0 , then find the speed of a particle when the displacement is half of the maximum value.

Define Rolling friction

If a body tied to a spring balance is fully immersed in a liquid, the apparent loss in its weight :(1) is more in a denser liquid(2) is less in a denser liquid(3) does not depend on density of liquid(4) is equal to apparent gain in weight of liquid

25. In the figure shown acceleration of 1 is x (upward) acceleration of pulley p3 wrt pulley p2 is y ( downward) and acceleration of 4 wrt pulley p3 is z (upward) then absolute acceleration of 2

13. Number of atoms in 1 ml of ammonia gas at STP is(1) 2.7 \ast 1019(2) 1.08 1020(3) 10.8 x 1020(4) 5.4 x 1019

Light ray travels in a

Sound travels in air at 340 m/s. In air, a sound source is producing a sound wave of wavelength 34 cm. Find the time period of this sound wave.

When light goes from an optically rarer to an optically denser medium,

Write the difference between conductor and insulator.

73.A CAR TRAVELLING AT 36 KM/H IN 5 SECONDS.WHAT IS THE ACCELERATION.? IF THE SAME CAR STOPS IN 20 SECONDS , WHAT IS THE RETARDATION ?

A car moving with initial velocity of 10 ms−1 attains a speed, v in 5 seconds. The car travels a distance of 100 m. Find v.

what is vander waals force of attraction

If we have two gear wheels of the same size, one of which rotates once around the other,which is stationary,how often will the first one turn around its own axle?

If the mass of a body is 5 kg, its weight on the surface of the earth would be ___. [Take acceleration due to gravity, g=9.8 ms−2]

A person is standing 1 km away from a source of sound. If the velocity of sound in the medium is 340 m/s, then calculate the number of oscillations (approximately) that the particles near the source complete before the sound wave reaches that person. The frequency of the sound is 500 Hz.

How many moles of FeC2O4 are required to react completely with one equivalent of K2Cr2O7 in acidic medium

Complete the following tables. Mass(Kg) Volume (m3)Density(kg/m3) 350 175 - - 190 4 Density of Metal (kg/m3) Density of water (kg/m3) Relative Density 103 5 8.5×103 103 - weight(N) Area (m2)Pressure(Nm−2) - 0.04 20,000 1500 500 -

A beaker contains 200gm of water. The heat capacity of the beaker is equal to that of 20gm of water. The initial temperature of water in the beaker is 20∘C. If 440gm of hot water at 92∘C is poured into it, the final temperature od the system is

In the first stanza, find words that show (i) that it was very cold. (ii) that it was late evening. (iii) that the traveller was alone.

In which state of matter does sound travel the a) Slowestb) Fastest

Which has a higher value- the sliding friction order static friction

Describe an experiment to determine the density of a liquid.

20.Let Rs and Rm be the distance of the geostationary satellite and moon from the centre of the earth. Then Rm/Rsis (1) (29)power 1/2 (2) (29)power 2/3 (3) 29 (4) (29)power 3/2

What should be the angle between two plane mirrors so that whatever be the angle of incidence, the incident ray and the reflected ray from the two mirrors be parallel to each other. A)600 B)900 C)1200 D)1750

Calculate the pressure developed by a force of 50 N acting on an area of 10 m2.

Metal are good conductors of ___ .

Ball bearing is a device which usually converts: (a) rolling friction into sliding friction (b) static friction into sliding friction (c) sliding friction into rolling friction (d) rolling friction into static friction

3 moles of NO and 24g of O_2 at 27^0C in a closed container of b=volume 9.0 L are allowed to react to produce maximum quantity of NO_2. What is the change in pressure in atmosphere? \lbrack Use R=0.082 L atm^{-1} K^{-1}\rbrack (1) 1.50 atm (2) 3.00 atm (3) 0.75 atm (4) 2.05 atm

Electric flux through the ring is

What is amine inversion?

A 1000 kg engine pulls a train of 4 wagons each of 2500 kg along a horizontal railway track.If the engine exerts a force of 50000N on wagons and track offers force of friction 10000N then calculate The force by wagon 1 on wagon 2?

why one cannot pull a cart without touching it ?

Why two like charges repell each other?

What are acceleration, displacement, velocity and speed formulas?

How would you increase the conductivity of lemon juice?

What will happen if the strip loses its flexibility?

Imagine that friction suddenly vanishes. How would life be affected? List ten such situations.

By virtue of mutual attraction between gravitational force two particles of mass m go round on a circle of radius r. the speed of either of the particle is

Which of the following is not a fundamental/basic unit of measurement?

How are permanent magnets made?

Two pendulums have time periods T and 5T4. They start oscillating in SHM at the same time from the mean position. After how many oscillations of the smaller pendulum they will be again in the same phase ?

Find the thrust on ground due to a rectangular block of mass 3kg lying on the ground.

How should one take the reading with a laboratory thermometer?

Squeezing a piece of lemon in between the fingers is an example of

One light year is _________.

Explain the function of the following parts of the human eye:- 1) Sclera 2) Cornea 3) Iris 4) Pupil 5) Crystalline lens 6) Aqueous Humor 7) Vitreous Humor 8) Ciliary Muscles 9) Retina 10) Optic Nerve