9478 + Interview Questions in Physics Page 19 InterviewSolution

901.	Tell 3 differences between heat and temperature.
Answer» Tell 3 differences between heat and temperature.

Discussion

902.	Pushing an object is an example of _________ force (contact or muscular force).
Answer» Pushing an object is an example of _________ force (contact or muscular force).

Discussion

903.	Explain why copper, though a good conductor of electricity, is a non-electolyte.
Answer» Explain why copper, though a good conductor of electricity, is a non-electolyte.

Discussion

904.	An example of percussion instrument
Answer» An example of percussion instrument

Discussion

905.	Many liquids that conduct electricity are solutions of _________.
Answer» Many liquids that conduct electricity are solutions of _________.

Discussion

906.	94. A body of mass m is placed on rough surface having friction U inclined at theta angle. If mass is in limiting equilibrium then theta is
Answer» 94. A body of mass m is placed on rough surface having friction U inclined at theta angle. If mass is in limiting equilibrium then theta is

Discussion

907.	Rapid conversion of water into steam is an example of ___.
Answer» Rapid conversion of water into steam is an example of ___.

Discussion

908.	Which of the following statements is wrong regarding a concave mirror?
Answer» Which of the following statements is wrong regarding a concave mirror?

Discussion

909.	y=(5x^2 +6)× (2x^3 +4) Then dy/dx = ?
Answer» y=(5x^2 +6)× (2x^3 +4) Then dy/dx = ?

Discussion

910.	In a number of musical instruments, air plays an important role. Can you name some such instruments?
Answer» In a number of musical instruments, air plays an important role. Can you name some such instruments?

Discussion

911.	Prove that 3+2root5 is irrational.
Answer» Prove that 3+2root5 is irrational.

Discussion

912.	Sketch electric field lines due to short electric dipole
Answer» Sketch electric field lines due to short electric dipole

Discussion

913.	6. A mass hangs from a spring on the earth's surface and elongates it by 0.5 cm .If the same mass is hanged from the same spring at a height of 700 km above the earth's surface. Then determine the elongation .Radius of Earth =6300km
Answer» 6. A mass hangs from a spring on the earth's surface and elongates it by 0.5 cm .If the same mass is hanged from the same spring at a height of 700 km above the earth's surface. Then determine the elongation .Radius of Earth =6300km

Discussion

914.	What is the audible range of the average human ear?
Answer» What is the audible range of the average human ear?

Discussion

915.	Why electric current comes under sclear quantity
Answer» Why electric current comes under sclear quantity

Discussion

916.	ABC is an equilateral triangle with o as its centre F1 F2 F3 represent the three forces along the sides AB ,BC, AC .if if total torque about centre is 0 the the magnitude of F3
Answer» ABC is an equilateral triangle with o as its centre F1 F2 F3 represent the three forces along the sides AB ,BC, AC .if if total torque about centre is 0 the the magnitude of F3

Discussion

917.	Answer the following question. (a) What is meant by the ‘rotation’ of planets? (b) What is the special feature of Venus? (c) Why is Mars called the Red Planet?
Answer» Answer the following question. (a) What is meant by the ‘rotation’ of planets? (b) What is the special feature of Venus? (c) Why is Mars called the Red Planet?

917.

Answer the following question. (a) What is meant by the ‘rotation’ of planets? (b) What is the special feature of Venus? (c) Why is Mars called the Red Planet?

Answer»

Answer the following question.

(a) What is meant by the ‘rotation’ of planets?

(b) What is the special feature of Venus?

(c) Why is Mars called the Red Planet?

Discussion

918.	A block of mass m1 is pulled along a horizontal frictionless surface by a rope of mass m1, if a force F is applied at the free end of the rope, the force exerted by the rope on the block is
Answer» A block of mass m1 is pulled along a horizontal frictionless surface by a rope of mass m1, if a force F is applied at the free end of the rope, the force exerted by the rope on the block is

Discussion

919.	How is electrostatic force a non contact force
Answer» How is electrostatic force a non contact force

Discussion

920.	Where do the two kinds of charges come from?
Answer» Where do the two kinds of charges come from?

Discussion

921.	The ratio of intensities between two coherent soundsources is 4 1. The difference of loudness in dBbetween maximum and minimum intensities whenthey interfere in the space is
Answer» The ratio of intensities between two coherent soundsources is 4 1. The difference of loudness in dBbetween maximum and minimum intensities whenthey interfere in the space is

Discussion

922.	Pressure inside 2 soap bubbles are 1.02atm and 1.05 atm respectively. the ratio of their surface area i
Answer» Pressure inside 2 soap bubbles are 1.02atm and 1.05 atm respectively. the ratio of their surface area i

Discussion

923.	16. A block of mass m is kept over another block ofmass 2m and the system rests on a smoothhorizontal surface. The coefficient of friction betweenthe blocks is 0.50. Find the work done by the forceof friction on the smaller block by the bigger blockduring a displacement d of the system, when a forcemg is applied to the lower block in terms of m
Answer» 16. A block of mass m is kept over another block ofmass 2m and the system rests on a smoothhorizontal surface. The coefficient of friction betweenthe blocks is 0.50. Find the work done by the forceof friction on the smaller block by the bigger blockduring a displacement d of the system, when a forcemg is applied to the lower block in terms of m

Discussion

924.	12 coplanar non collinear forces (all of the equal magnitude)maintain a body equilibrium then find the angles between any two adjacentforces
Answer» 12 coplanar non collinear forces (all of the equal magnitude)maintain a body equilibrium then find the angles between any two adjacentforces

Discussion

925.	When an object obstructs the path of light, the dark area formed on the screen is called________.
Answer» When an object obstructs the path of light, the dark area formed on the screen is called________.

Discussion

926.	A force causes a stationary body of mass 12 kg to be accelerated at a rate of 2 ms−2 . If the final velocity of the body is 8 ms−1, find the work done by the force.
Answer» A force causes a stationary body of mass $12 k g$ to be accelerated at a rate of $2 m s^{- 2}$ . If the final velocity of the body is $8 m s^{- 1}$ , find the work done by the force.

Discussion

927.	why the gravitational force depends on mass and dis†an ce between two objec
Answer» why the gravitational force depends on mass and dis†an ce between two objec

Discussion

928.	Why are lubricants (oil or grease) applied to rubbing surfaces of machines?
Answer» Why are lubricants (oil or grease) applied to rubbing surfaces of machines?

Discussion

929.	What is colour vision and what are the dimensions of colour?
Answer» What is colour vision and what are the dimensions of colour?

Discussion

930.	A force F is acting on a hinged disc Pulley. Find angular acceleration of disc
Answer» A force F is acting on a hinged disc Pulley. Find angular acceleration of disc

Discussion

931.	A wave function expressing the displacement (y) as a function of its position (x) and time (t) is given as y = P log (Qx + e–Rt).Which of the following expressions has dimensions different from other?
Answer» A wave function expressing the displacement (y) as a function of its position (x) and time (t) is given as y = P log (Qx + e–Rt). Which of the following expressions has dimensions different from other?

Discussion

932.	Series equivalent of two capacitors is 3microfarad and parallel equivalent is 16microfarad. What is the value of individual capacitors?
Answer» Series equivalent of two capacitors is 3microfarad and parallel equivalent is 16microfarad. What is the value of individual capacitors?

Discussion

933.	You are given two samples of water labelled as ‘A’ and ‘B’. Sample ‘A’ boils at 100°C and sample ‘B’ boils at 102°C. Which sample of water will not freeze at 0°C? Comment.
Answer» You are given two samples of water labelled as ‘A’ and ‘B’. Sample ‘A’ boils at 100°C and sample ‘B’ boils at 102°C. Which sample of water will not freeze at 0°C? Comment.

Discussion

934.	The speed of sound on a hot summer day will be ____ the speed of sound on a cold winter day.
Answer» The speed of sound on a hot summer day will be ____ the speed of sound on a cold winter day.

Discussion

935.	Question 4 (a) Fill in the blank with a suitable word. Time taken by an object to complete one oscillation is called _________.
Answer» Question 4 (a) Fill in the blank with a suitable word. Time taken by an object to complete one oscillation is called _________.

Discussion

936.	Resistance of a wire is 8Ω.It is stretched in such away that it experiences a longitudinal strain of 400%. The new resistance is
Answer» Resistance of a wire is $8 Ω$ .It is stretched in such away that it experiences a longitudinal strain of $400 %$ . The new resistance is

Discussion

937.	Question 6Does pure water conduct electricity? If not, what can we do to make it conducting?
Answer» Question 6 Does pure water conduct electricity? If not, what can we do to make it conducting?

Discussion

938.	30. A man of mass m climbs a rope ladder suspended below a balloon of mass M. The balloon is stationary w.r.t.ground. If man begins to climb the ladder at speed V(w.r.t. ladder),find the speed of balloon w.r.t. ground
Answer» 30. A man of mass m climbs a rope ladder suspended below a balloon of mass M. The balloon is stationary w.r.t.ground. If man begins to climb the ladder at speed V(w.r.t. ladder),find the speed of balloon w.r.t. ground

Discussion

939.	38. Assertion - liquid molecules have greater potential energy at melting point Reason- intermolecular spacing between molecules increases at melting point
Answer» 38. Assertion - liquid molecules have greater potential energy at melting point Reason- intermolecular spacing between molecules increases at melting point

Discussion

940.	Question 2In the following circuits (figure), heat produced in the resistor or combination of resistors connected to a 12V battery will be(a) same in all the cases(b) minimum in case (i)(c) maximum in case (ii)(d) maximum in case (iii)
Answer» Question 2 In the following circuits (figure), heat produced in the resistor or combination of resistors connected to a 12V battery will be (a) same in all the cases (b) minimum in case (i) (c) maximum in case (ii) (d) maximum in case (iii)

Discussion

941.	Question 2Guess which sound has a higher pitch: guitar or car horn?
Answer» Question 2 Guess which sound has a higher pitch: guitar or car horn?

Discussion

942.	ten identical cells connected in series are needed to heat a wire of length one metre and radius r by 10degree C in time t .How many cells will e required to heat the wire of length two meter of the same radius by the same temp in time 't'
Answer» ten identical cells connected in series are needed to heat a wire of length one metre and radius r by 10degree C in time t .How many cells will e required to heat the wire of length two meter of the same radius by the same temp in time 't'

Discussion

943.	How can we define pressure?
Answer» How can we define pressure?

Discussion

944.	How path difference for destructive interference is 2n-1lambda/2
Answer» How path difference for destructive interference is 2n-1lambda/2

Discussion

945.	The star that lies close to the axis of rotation of earth is:
Answer» The star that lies close to the axis of rotation of earth is:

Discussion

946.	Question 10 (iii)State whether the following statement is ‘True’ or ‘False’The planets do not emit light of their own.
Answer» Question 10 (iii) State whether the following statement is ‘True’ or ‘False’ The planets do not emit light of their own.

Discussion

947.	1mol of PCI(g) is present in 1 L of container. Ivapour density of equilibrium mixture is 69.5 thencalculate the equilibriium constant (Kc)Reaction PCI (g) PCI, (g)+Cl,(g)(1) 1,5(2) M(3) 0.5(4) 0.25
Answer» 1mol of PCI(g) is present in 1 L of container. Ivapour density of equilibrium mixture is 69.5 thencalculate the equilibriium constant (Kc)Reaction PCI (g) PCI, (g)+Cl,(g)(1) 1,5(2) M(3) 0.5(4) 0.25

Discussion

948.	Why is it called that friction is a necessary evil?
Answer» Why is it called that friction is a necessary evil?

Discussion

949.	how lateral inversion is formed in plane mirror ? Does lateral inversion is also formed in other mirrors like (concave , convex ) .
Answer» how lateral inversion is formed in plane mirror ? Does lateral inversion is also formed in other mirrors like (concave , convex ) .

Discussion

950.	What's written in the workbook of maths chapter 1st question number 18 I can't understand it?
Answer» What's written in the workbook of maths chapter 1st question number 18 I can't understand it?

Discussion

Explore topic-wise InterviewSolutions in .

Tell 3 differences between heat and temperature.

Pushing an object is an example of _________ force (contact or muscular force).

Explain why copper, though a good conductor of electricity, is a non-electolyte.

An example of percussion instrument

Many liquids that conduct electricity are solutions of _________.

94. A body of mass m is placed on rough surface having friction U inclined at theta angle. If mass is in limiting equilibrium then theta is

Rapid conversion of water into steam is an example of ___.

Which of the following statements is wrong regarding a concave mirror?

y=(5x^2 +6)× (2x^3 +4) Then dy/dx = ?

In a number of musical instruments, air plays an important role. Can you name some such instruments?

Prove that 3+2root5 is irrational.

Sketch electric field lines due to short electric dipole

6. A mass hangs from a spring on the earth's surface and elongates it by 0.5 cm .If the same mass is hanged from the same spring at a height of 700 km above the earth's surface. Then determine the elongation .Radius of Earth =6300km

What is the audible range of the average human ear?

Why electric current comes under sclear quantity

ABC is an equilateral triangle with o as its centre F1 F2 F3 represent the three forces along the sides AB ,BC, AC .if if total torque about centre is 0 the the magnitude of F3

Answer the following question. (a) What is meant by the ‘rotation’ of planets? (b) What is the special feature of Venus? (c) Why is Mars called the Red Planet?

A block of mass m1 is pulled along a horizontal frictionless surface by a rope of mass m1, if a force F is applied at the free end of the rope, the force exerted by the rope on the block is

How is electrostatic force a non contact force

Where do the two kinds of charges come from?

The ratio of intensities between two coherent soundsources is 4 1. The difference of loudness in dBbetween maximum and minimum intensities whenthey interfere in the space is

Pressure inside 2 soap bubbles are 1.02atm and 1.05 atm respectively. the ratio of their surface area i

12 coplanar non collinear forces (all of the equal magnitude)maintain a body equilibrium then find the angles between any two adjacentforces

When an object obstructs the path of light, the dark area formed on the screen is called________.

A force causes a stationary body of mass 12 kg to be accelerated at a rate of 2 ms−2 . If the final velocity of the body is 8 ms−1, find the work done by the force.

why the gravitational force depends on mass and dis†an ce between two objec

Why are lubricants (oil or grease) applied to rubbing surfaces of machines?

What is colour vision and what are the dimensions of colour?

A force F is acting on a hinged disc Pulley. Find angular acceleration of disc

A wave function expressing the displacement (y) as a function of its position (x) and time (t) is given as y = P log (Qx + e–Rt).Which of the following expressions has dimensions different from other?

Series equivalent of two capacitors is 3microfarad and parallel equivalent is 16microfarad. What is the value of individual capacitors?

You are given two samples of water labelled as ‘A’ and ‘B’. Sample ‘A’ boils at 100°C and sample ‘B’ boils at 102°C. Which sample of water will not freeze at 0°C? Comment.

The speed of sound on a hot summer day will be ____ the speed of sound on a cold winter day.

Question 4 (a) Fill in the blank with a suitable word. Time taken by an object to complete one oscillation is called _________.

Resistance of a wire is 8Ω.It is stretched in such away that it experiences a longitudinal strain of 400%. The new resistance is

Question 6Does pure water conduct electricity? If not, what can we do to make it conducting?

30. A man of mass m climbs a rope ladder suspended below a balloon of mass M. The balloon is stationary w.r.t.ground. If man begins to climb the ladder at speed V(w.r.t. ladder),find the speed of balloon w.r.t. ground

38. Assertion - liquid molecules have greater potential energy at melting point Reason- intermolecular spacing between molecules increases at melting point

Question 2In the following circuits (figure), heat produced in the resistor or combination of resistors connected to a 12V battery will be(a) same in all the cases(b) minimum in case (i)(c) maximum in case (ii)(d) maximum in case (iii)

Question 2Guess which sound has a higher pitch: guitar or car horn?

ten identical cells connected in series are needed to heat a wire of length one metre and radius r by 10degree C in time t .How many cells will e required to heat the wire of length two meter of the same radius by the same temp in time 't'

How can we define pressure?

How path difference for destructive interference is 2n-1lambda/2

The star that lies close to the axis of rotation of earth is:

Question 10 (iii)State whether the following statement is ‘True’ or ‘False’The planets do not emit light of their own.

1mol of PCI(g) is present in 1 L of container. Ivapour density of equilibrium mixture is 69.5 thencalculate the equilibriium constant (Kc)Reaction PCI (g) PCI, (g)+Cl,(g)(1) 1,5(2) M(3) 0.5(4) 0.25

Why is it called that friction is a necessary evil?

how lateral inversion is formed in plane mirror ? Does lateral inversion is also formed in other mirrors like (concave , convex ) .

What's written in the workbook of maths chapter 1st question number 18 I can't understand it?