9478 + Interview Questions in Physics Page 94 InterviewSolution

4651.	4.0 g of a gas occupies 22.4 litres at NTP. The specific heat capacity of the gas at cons†an t volume is 5.0 J/K/mol. If the speed of sound in this gas at NTP is 952 m/s, then the heat capacity at cons†an t pressure is (Take gas cons†an t R=8.3J/K/mol)
Answer» 4.0 g of a gas occupies 22.4 litres at NTP. The specific heat capacity of the gas at cons†an t volume is 5.0 J/K/mol. If the speed of sound in this gas at NTP is 952 m/s, then the heat capacity at cons†an t pressure is (Take gas cons†an t R=8.3J/K/mol)

Discussion

4652.	A train moving towards a tunnel in a huge mountain with a speed of 12m/s sounds its whistle. If the driver hears 6 beats per second and speed of sound in air is 332 m/s,the frequency of whistle is how much
Answer» A train moving towards a tunnel in a huge mountain with a speed of 12m/s sounds its whistle. If the driver hears 6 beats per second and speed of sound in air is 332 m/s,the frequency of whistle is how much

Discussion

4653.	Does milk conduct electricity? (I want a definite answer).
Answer» Does milk conduct electricity? (I want a definite answer).

Discussion

4654.	An object moves down on a rough inclined plane at an angle thita to the horizontal If the coefficient of friction between the object and the inclined plane is mue the net downward acceleration of the object equals
Answer» An object moves down on a rough inclined plane at an angle thita to the horizontal If the coefficient of friction between the object and the inclined plane is mue the net downward acceleration of the object equals

Discussion

4655.	In a material under a state of plane strain, a 10×10 mm square centred at a point gets deformed as shown in the figure.If the shear strain γxy at this point is expressed as 0.001 k (in rad.) the value of k is
Answer» In a material under a state of plane strain, a $10 \times 10$ mm square centred at a point gets deformed as shown in the figure. If the shear strain $γ_{x y}$ at this point is expressed as $0.001 k$ (in rad.) the value of $k$ is

Discussion

4656.	A 400 kg rocket is fired from earth so that exhaust speed is 1000 m/s. Then calculate mass of fuel burning per second, to provide initial thrust to overcome its weight
Answer» A 400 kg rocket is fired from earth so that exhaust speed is 1000 m/s. Then calculate mass of fuel burning per second, to provide initial thrust to overcome its weight

Discussion

4657.	What is the difference between longitudinal, transverse and mechanical wave ?
Answer» What is the difference between longitudinal, transverse and mechanical wave ?

Discussion

4658.	If a+5=10+b then a or b can be irrational
Answer» If a+5=10+b then a or b can be irrational

Discussion

4659.	A box follows a zigzag path to reach from point A to B. The actual length of the path is 5 m and the length of the straight line joining the two points is 2 m. If a force of 5 N acts on the box then the work done on the box by the force (in joules) is ___ .
Answer» A box follows a zigzag path to reach from point A to B. The actual length of the path is 5 m and the length of the straight line joining the two points is 2 m. If a force of 5 N acts on the box then the work done on the box by the force (in joules) is ___ .

Discussion

4660.	Two plane mirrors are placed making an angle θ in between them. Write an expression for the number of images formed if an object is placed in between the mirrors. State the condition, if any.
Answer» Two plane mirrors are placed making an angle $θ$ in between them. Write an expression for the number of images formed if an object is placed in between the mirrors. State the condition, if any.

Discussion

4661.	A ball of mass 50g is dropped from a height 20m.A boy on the ground hits the ball vertically upwards with a bat with an average force of 200N so that it attains a vertical height of 45m.The time for which the ball remains in contact with the bat is_____.Explain
Answer» A ball of mass 50g is dropped from a height 20m.A boy on the ground hits the ball vertically upwards with a bat with an average force of 200N so that it attains a vertical height of 45m.The time for which the ball remains in contact with the bat is_____.Explain

Discussion

4662.	find the torque about the origin when the force of 3 j^ acts on a particle whose position vector is 2 k ^ m
Answer» find the torque about the origin when the force of 3 j^ acts on a particle whose position vector is 2 k ^ m

Discussion

4663.	how to find the coefficent of friction when the object is rolling on an inclined plain?
Answer» how to find the coefficent of friction when the object is rolling on an inclined plain?

Discussion

4664.	Define moment of force and state its S.I. unit.
Answer» Define moment of force and state its S.I. unit.

Discussion

4665.	Differentiate between Kinetic energy and potential energy
Answer» Differentiate between Kinetic energy and potential energy

Discussion

4666.	25.A weight W rests on rough horizontal plane.if the angle of friction be theta,then calculate the least horizontal force that will move the body along the plane
Answer» 25.A weight W rests on rough horizontal plane.if the angle of friction be theta,then calculate the least horizontal force that will move the body along the plane

Discussion

4667.	Statement 1: For the same force acting on two different surfaces, more pressure is developed on the surface with a smaller area.Statement 2: Pressure is defined as force per unit area.
Answer» Statement 1: For the same force acting on two different surfaces, more pressure is developed on the surface with a smaller area. Statement 2: Pressure is defined as force per unit area.

Discussion

4668.	How will you distinguish between a plane mirror, concave mirror and a convex mirror, without touching them?
Answer» How will you distinguish between a plane mirror, concave mirror and a convex mirror, without touching them?

Discussion

4669.	S.I. unit of wavelength of a wave is:-
Answer» S.I. unit of wavelength of a wave is:-

Discussion

4670.	What is role of ions in flow of electric current?
Answer» What is role of ions in flow of electric current?

Discussion

4671.	A ray of light is incident normally (perpendicularly) on a plane mirror. Where will this ray of light go after reflection from the mirror?
Answer» A ray of light is incident normally (perpendicularly) on a plane mirror. Where will this ray of light go after reflection from the mirror?

Discussion

4672.	Why do we not hear the screams of a bat ?
Answer» Why do we not hear the screams of a bat ?

Discussion

4673.	(a) What is meant by atmospheric pressure? What is the cause of atmospheric pressure? (b) Why are our bodies not crushed by the large pressure exerted by the atmosphere? (c) Explain why, atmospheric pressure decreases as we go higher up above the earth's surface.
Answer» (a) What is meant by atmospheric pressure? What is the cause of atmospheric pressure? (b) Why are our bodies not crushed by the large pressure exerted by the atmosphere? (c) Explain why, atmospheric pressure decreases as we go higher up above the earth's surface.

4673.

(a) What is meant by atmospheric pressure? What is the cause of atmospheric pressure? (b) Why are our bodies not crushed by the large pressure exerted by the atmosphere? (c) Explain why, atmospheric pressure decreases as we go higher up above the earth's surface.

Answer»

(a) What is meant by atmospheric pressure? What is the cause of atmospheric pressure?

(b) Why are our bodies not crushed by the large pressure exerted by the atmosphere?

(c) Explain why, atmospheric pressure decreases as we go higher up above the earth's surface.

Discussion

4674.	The paramagnetic species is (1) KO_2 (2) SiO_2 (3) TiO_2 (4) BaO_2
Answer» The paramagnetic species is (1) KO_2 (2) SiO_2 (3) TiO_2 (4) BaO_2

Discussion

4675.	Q. Surface tension of soap solution is S= 1.9 \ast 10^{-2 }N/m . The energy stored in a soap bubble of diameter 2cm will be? \lbrack in J\rbrack
Answer» Q. Surface tension of soap solution is S= 1.9 \ast 10^{-2 }N/m . The energy stored in a soap bubble of diameter 2cm will be? \lbrack in J\rbrack

Discussion

4676.	Like charge repel each other but sometime it is exception. Explain this statement
Answer» Like charge repel each other but sometime it is exception. Explain this statement

Discussion

4677.	A police car horn emits a sound at a frequency 240 Hz When the car is at rest . If the sleed of the sound is 330m/s the frequency heard by an observer who is approaching the car ay a speed of 11m/s is how much
Answer» A police car horn emits a sound at a frequency 240 Hz When the car is at rest . If the sleed of the sound is 330m/s the frequency heard by an observer who is approaching the car ay a speed of 11m/s is how much

Discussion

4678.	Why is an gold leaf electroscope provided with a metal foil which is earthed
Answer» Why is an gold leaf electroscope provided with a metal foil which is earthed

Discussion

4679.	When two charged glass rods, after being rubbed with silk cloths are brought towards each other, they ______.
Answer» When two charged glass rods, after being rubbed with silk cloths are brought towards each other, they ______.

Discussion

4680.	why avehical are fitting with shocker
Answer» why avehical are fitting with shocker

Discussion

4681.	Define instantaneous and average velocity.
Answer» Define instantaneous and average velocity.

Discussion

4682.	ablock of steel of size 5 × 5 ×5 cm3 is weighed in water. If relative density of steel is 7, its apparent weight is
Answer» ablock of steel of size 5 × 5 ×5 cm3 is weighed in water. If relative density of steel is 7, its apparent weight is

Discussion

4683.	f(x,y)=x^3y^4+3x^2y^3-7x^6y^3In this highest degree is 9.So,if f(x,y) came is it necessary that all the terms must consist the variables x,y?
Answer» f(x,y)=x^3y^4+3x^2y^3-7x^6y^3 In this highest degree is 9. So,if f(x,y) came is it necessary that all the terms must consist the variables x,y?

Discussion

4684.	How come charge moving in magnetic field is not loosing any energy?
Answer» How come charge moving in magnetic field is not loosing any energy?

Discussion

4685.	When a coin placed in a bowl of water and seen from above, it appears:
Answer» When a coin placed in a bowl of water and seen from above, it appears:

Discussion

4686.	A wave yi = 0.3 cos (0.2x − 40t) is travelling along a string toward a boundary at x = 0. What is the expression for the reflected wave when, the string has a free end at x = 0. Assume SI units
Answer» A wave $y_{i} = 0.3 c o s (0.2 x - 40 t)$ is travelling along a string toward a boundary at $x = 0$ . What is the expression for the reflected wave when, the string has a free end at $x = 0$ . Assume SI units

Discussion

4687.	Name two common lubricants.
Answer» Name two common lubricants.

Discussion

4688.	A certain force exerted for 0.5s raises the speed of an object from 2.4m/s to 4.9m/s.Later the same force is applied for 2.5s.how much does the speed of the object change in 2.5s?
Answer» A certain force exerted for 0.5s raises the speed of an object from 2.4m/s to 4.9m/s.Later the same force is applied for 2.5s.how much does the speed of the object change in 2.5s?

Discussion

4689.	If you place an iron rod close to your ear and someone taps it on the other end sometime you hear that voice two Times why is it?
Answer» If you place an iron rod close to your ear and someone taps it on the other end sometime you hear that voice two Times why is it?

Discussion

4690.	Relative refractive index can be:
Answer» Relative refractive index can be:

Discussion

4691.	The source producing sound and an observer both are moving along the direction of propagation of sound waves. If the respective velocities of sound, source and an observer are v, v1 andv0,, then the apparent frequency heard by the observer will be (n = frequency of sound)
Answer» The source producing sound and an observer both are moving along the direction of propagation of sound waves. If the respective velocities of sound, source and an observer are v, $v_{1} a n d v_{0}$ ,, then the apparent frequency heard by the observer will be (n = frequency of sound)

4691.

The source producing sound and an observer both are moving along the direction of propagation of sound waves. If the respective velocities of sound, source and an observer are v, v1 andv0,, then the apparent frequency heard by the observer will be (n = frequency of sound)

Answer»

The source producing sound and an observer both are moving along the

direction of propagation of sound waves. If the respective velocities of

sound, source and an observer are v, $v_{1} a n d v_{0}$ ,, then the apparent

frequency heard by the observer will be (n = frequency of sound)

Discussion

4692.	A girl is sitting in front of a plane mirror at a dstance of 4m from it. What is the distance between the girl and her image?
Answer» A girl is sitting in front of a plane mirror at a dstance of $4 m$ from it. What is the distance between the girl and her image?

Discussion

4693.	What is the heating effect of electric current? Give a few real-life examples where it is used.
Answer» What is the heating effect of electric current? Give a few real-life examples where it is used.

Discussion

4694.	Explain charging by friction and charging by induction? [3 MARKS]
Answer» Explain charging by friction and charging by induction? [3 MARKS]

Discussion

4695.

Match the following. ‘A’ ‘B’ (a) Morning star 1. 27.3 days (b) The Great Bear 2. Between Mars and Jupiter (c) IRS 3. Venus (d) Asteroids 4. Constellation (e) Halley’s comet 5. Artificial satellite (f) Rotation of the moon 6. 76 years

Answer»

Match the following.

‘A’		‘B’
(a)	Morning star		1.	27.3 days
(b)	The Great Bear		2.	Between Mars and Jupiter
(c)	IRS		3.	Venus
(d)	Asteroids		4.	Constellation
(e)	Halley’s comet		5.	Artificial satellite
(f)	Rotation of the moon		6.	76 years

Discussion

4696.	If the kinetic energy of a particle continuously increases with time,
Answer» If the kinetic energy of a particle continuously increases with time,

Discussion

4697.	Explain the physical significance of electric field ?
Answer» Explain the physical significance of electric field ?

Discussion

4698.	What is the Braille system and in what way it helps visually challenged persons? Explain in details.
Answer» What is the Braille system and in what way it helps visually challenged persons? Explain in details.

Discussion

4699.	Why do rays in a parallel beam of incident light not remain parallel to each other after reflection from a rough surface?
Answer» Why do rays in a parallel beam of incident light not remain parallel to each other after reflection from a rough surface?

Discussion

4700.	A body falling from rest covers 7/16 of the total height in the last second of its fall .The height from which it is fall
Answer» A body falling from rest covers 7/16 of the total height in the last second of its fall .The height from which it is fall

Discussion

Explore topic-wise InterviewSolutions in .

4.0 g of a gas occupies 22.4 litres at NTP. The specific heat capacity of the gas at cons†an t volume is 5.0 J/K/mol. If the speed of sound in this gas at NTP is 952 m/s, then the heat capacity at cons†an t pressure is (Take gas cons†an t R=8.3J/K/mol)

A train moving towards a tunnel in a huge mountain with a speed of 12m/s sounds its whistle. If the driver hears 6 beats per second and speed of sound in air is 332 m/s,the frequency of whistle is how much

Does milk conduct electricity? (I want a definite answer).

An object moves down on a rough inclined plane at an angle thita to the horizontal If the coefficient of friction between the object and the inclined plane is mue the net downward acceleration of the object equals

In a material under a state of plane strain, a 10×10 mm square centred at a point gets deformed as shown in the figure.If the shear strain γxy at this point is expressed as 0.001 k (in rad.) the value of k is

A 400 kg rocket is fired from earth so that exhaust speed is 1000 m/s. Then calculate mass of fuel burning per second, to provide initial thrust to overcome its weight

What is the difference between longitudinal, transverse and mechanical wave ?

If a+5=10+b then a or b can be irrational

A box follows a zigzag path to reach from point A to B. The actual length of the path is 5 m and the length of the straight line joining the two points is 2 m. If a force of 5 N acts on the box then the work done on the box by the force (in joules) is ___ .

Two plane mirrors are placed making an angle θ in between them. Write an expression for the number of images formed if an object is placed in between the mirrors. State the condition, if any.

A ball of mass 50g is dropped from a height 20m.A boy on the ground hits the ball vertically upwards with a bat with an average force of 200N so that it attains a vertical height of 45m.The time for which the ball remains in contact with the bat is_____.Explain

find the torque about the origin when the force of 3 j^ acts on a particle whose position vector is 2 k ^ m

how to find the coefficent of friction when the object is rolling on an inclined plain?

Define moment of force and state its S.I. unit.

Differentiate between Kinetic energy and potential energy

25.A weight W rests on rough horizontal plane.if the angle of friction be theta,then calculate the least horizontal force that will move the body along the plane

Statement 1: For the same force acting on two different surfaces, more pressure is developed on the surface with a smaller area.Statement 2: Pressure is defined as force per unit area.

How will you distinguish between a plane mirror, concave mirror and a convex mirror, without touching them?

S.I. unit of wavelength of a wave is:-

What is role of ions in flow of electric current?

A ray of light is incident normally (perpendicularly) on a plane mirror. Where will this ray of light go after reflection from the mirror?

Why do we not hear the screams of a bat ?

(a) What is meant by atmospheric pressure? What is the cause of atmospheric pressure? (b) Why are our bodies not crushed by the large pressure exerted by the atmosphere? (c) Explain why, atmospheric pressure decreases as we go higher up above the earth's surface.

The paramagnetic species is (1) KO_2 (2) SiO_2 (3) TiO_2 (4) BaO_2

Q. Surface tension of soap solution is S= 1.9 \ast 10^{-2 }N/m . The energy stored in a soap bubble of diameter 2cm will be? \lbrack in J\rbrack

Like charge repel each other but sometime it is exception. Explain this statement

A police car horn emits a sound at a frequency 240 Hz When the car is at rest . If the sleed of the sound is 330m/s the frequency heard by an observer who is approaching the car ay a speed of 11m/s is how much

Why is an gold leaf electroscope provided with a metal foil which is earthed

When two charged glass rods, after being rubbed with silk cloths are brought towards each other, they ______.

why avehical are fitting with shocker

Define instantaneous and average velocity.

ablock of steel of size 5 × 5 ×5 cm3 is weighed in water. If relative density of steel is 7, its apparent weight is

f(x,y)=x^3y^4+3x^2y^3-7x^6y^3In this highest degree is 9.So,if f(x,y) came is it necessary that all the terms must consist the variables x,y?

How come charge moving in magnetic field is not loosing any energy?

When a coin placed in a bowl of water and seen from above, it appears:

A wave yi = 0.3 cos (0.2x − 40t) is travelling along a string toward a boundary at x = 0. What is the expression for the reflected wave when, the string has a free end at x = 0. Assume SI units

Name two common lubricants.

A certain force exerted for 0.5s raises the speed of an object from 2.4m/s to 4.9m/s.Later the same force is applied for 2.5s.how much does the speed of the object change in 2.5s?

If you place an iron rod close to your ear and someone taps it on the other end sometime you hear that voice two Times why is it?

Relative refractive index can be:

The source producing sound and an observer both are moving along the direction of propagation of sound waves. If the respective velocities of sound, source and an observer are v, v1 andv0,, then the apparent frequency heard by the observer will be (n = frequency of sound)

A girl is sitting in front of a plane mirror at a dstance of 4m from it. What is the distance between the girl and her image?

What is the heating effect of electric current? Give a few real-life examples where it is used.

Explain charging by friction and charging by induction? [3 MARKS]

Match the following. ‘A’ ‘B’ (a) Morning star 1. 27.3 days (b) The Great Bear 2. Between Mars and Jupiter (c) IRS 3. Venus (d) Asteroids 4. Constellation (e) Halley’s comet 5. Artificial satellite (f) Rotation of the moon 6. 76 years

If the kinetic energy of a particle continuously increases with time,

Explain the physical significance of electric field ?

What is the Braille system and in what way it helps visually challenged persons? Explain in details.

Why do rays in a parallel beam of incident light not remain parallel to each other after reflection from a rough surface?

A body falling from rest covers 7/16 of the total height in the last second of its fall .The height from which it is fall