9478 + Interview Questions in Physics Page 35 InterviewSolution

1701.	why waves transfer energy but not matter
Answer» why waves transfer energy but not matter

Discussion

1702.	Q-1:- Let Say a body has 2 more electrons than usual, so the charge on body is -2C. son if it came in contact with another body of same material then both will have charge of -1C. if the charge of -3C was there instead of -2C then will the both bodies have -1.5C because electrons cannot be divided in two halves.Q-2:- Will the flow of charge depend upon the size of body like -2C Charged body is small than the neutral body will it affect the flow of charge or still both bodies have -1C charge
Answer» Q-1:- Let Say a body has 2 more electrons than usual, so the charge on body is -2C. son if it came in contact with another body of same material then both will have charge of -1C. if the charge of -3C was there instead of -2C then will the both bodies have -1.5C because electrons cannot be divided in two halves. Q-2:- Will the flow of charge depend upon the size of body like -2C Charged body is small than the neutral body will it affect the flow of charge or still both bodies have -1C charge

Discussion

1703.	why is it easier to bend a piece of steel than to bend a piece of wood?
Answer» why is it easier to bend a piece of steel than to bend a piece of wood?

Discussion

1704.	The area under velocity – time graph gives________.
Answer» The area under velocity – time graph gives________.

Discussion

1705.	What is force? State the various effects of force.
Answer» What is force? State the various effects of force.

Discussion

1706.	What is the name of the scale used to quantify the size of an earthquake?
Answer» What is the name of the scale used to quantify the size of an earthquake?

Discussion

1707.	In non-inertial frame, the second law of motion is written as _______ , where Fp is a pseudo-force while a is the acceleration of the body relative to non-inertial frame.
Answer» In non-inertial frame, the second law of motion is written as _______ , where Fp is a pseudo-force while a is the acceleration of the body relative to non-inertial frame.

Discussion

1708.	calculate force on +2.0microcoulomb of charge due to the two other charges is +7.5 microcoulomb and -3.5microcoulomb of a equilateral triangle
Answer» calculate force on +2.0microcoulomb of charge due to the two other charges is +7.5 microcoulomb and -3.5microcoulomb of a equilateral triangle

Discussion

1709.	Four students A, B, C and D selected the following items from the materials available in the science laboratory to perform an experiment to study the refraction of light through a glass slab:(A) convex lens, glass slab, pins, drawing board, white paper, scale(B) glass slab, pins, drawing board, scale, white paper, protractor(C) glass slab, glass prism, candle, screen, pins, scale, drawing board, protractor(D) concave mirror, pins, glass slab, protractor, white paper, drawing boardCorrect choice of the items required is made by the student:(1) A(2) B(3) C(4) D
Answer» Four students A, B, C and D selected the following items from the materials available in the science laboratory to perform an experiment to study the refraction of light through a glass slab: (A) convex lens, glass slab, pins, drawing board, white paper, scale (B) glass slab, pins, drawing board, scale, white paper, protractor (C) glass slab, glass prism, candle, screen, pins, scale, drawing board, protractor (D) concave mirror, pins, glass slab, protractor, white paper, drawing board Correct choice of the items required is made by the student: (1) A (2) B (3) C (4) D

Discussion

1710.	What happens when a negatively charged body is placed on the ground?
Answer» What happens when a negatively charged body is placed on the ground?

Discussion

1711.	If Force=0 then why final velocity = initial velocity ?
Answer» If Force=0 then why final velocity = initial velocity ?

Discussion

1712.	What is evaporation? Explain it on the basis of the molecular motion.
Answer» What is evaporation? Explain it on the basis of the molecular motion.

Discussion

1713.	degree of freedom of gas(f) for monoatomic gas ,diatomic or polyatomic gases?
Answer» degree of freedom of gas(f) for monoatomic gas ,diatomic or polyatomic gases?

Discussion

1714.	Question 20 (e)Boojho planned an activity to observe an object A through pipes as shown in figure, so that he could see objects which he could not directly see. At each corner a plane mirror is placed at 45 degrees in order to deviate the light rays by 90 degrees.If any of the mirrors is removed, will he be able to see the objects?
Answer» Question 20 (e) Boojho planned an activity to observe an object A through pipes as shown in figure, so that he could see objects which he could not directly see. At each corner a plane mirror is placed at 45 degrees in order to deviate the light rays by 90 degrees. If any of the mirrors is removed, will he be able to see the objects?

1714.

Question 20 (e)Boojho planned an activity to observe an object A through pipes as shown in figure, so that he could see objects which he could not directly see. At each corner a plane mirror is placed at 45 degrees in order to deviate the light rays by 90 degrees.If any of the mirrors is removed, will he be able to see the objects?

Answer»

Question 20 (e)

Boojho planned an activity to observe an object A through pipes as shown in figure, so that he could see objects which he could not directly see. At each corner a plane mirror is placed at 45 degrees in order to deviate the light rays by 90 degrees.

If any of the mirrors is removed, will he be able to see the objects?

Discussion

1715.	Question 26Explain why it is safer to use a wireless telephone instead of a landline telephone during lightning.
Answer» Question 26 Explain why it is safer to use a wireless telephone instead of a landline telephone during lightning.

1715.

Question 26Explain why it is safer to use a wireless telephone instead of a landline telephone during lightning.

Answer»

Question 26

Explain why it is safer to use a wireless telephone instead of a landline telephone during lightning.

Discussion

1716.	29. A: Sodium ions are discharged when aqueous solution of Nacl electrolysed using mercury electrode. R: The nature of electrode can effect the order of discharge of ions.
Answer» 29. A: Sodium ions are discharged when aqueous solution of Nacl electrolysed using mercury electrode. R: The nature of electrode can effect the order of discharge of ions.

Discussion

1717.	The origin of all contact forces can be traced to non contact forces. justify this statement
Answer» The origin of all contact forces can be traced to non contact forces. justify this statement

Discussion

1718.	Statement 1: The flow of current in a poor conductor is impossible.Statement 2: Under certain conditions current can flow through a poor conductor.
Answer» Statement 1: The flow of current in a poor conductor is impossible. Statement 2: Under certain conditions current can flow through a poor conductor.

1718.

Statement 1: The flow of current in a poor conductor is impossible.Statement 2: Under certain conditions current can flow through a poor conductor.

Answer»

Statement 1: The flow of current in a poor conductor is impossible.

Statement 2: Under certain conditions current can flow through a poor conductor.

Discussion

1719.	Define the angle of reflection.
Answer» Define the angle of reflection.

Discussion

1720.	Where did the child find the sea shell? What did the child do with the shell? What did the child hear?
Answer» Where did the child find the sea shell? What did the child do with the shell? What did the child hear?

Discussion

1721.	The work function of a metal is 4 eV if 5000 angstrom of light is incident on the metal. Is there any photo electric effect ?
Answer» The work function of a metal is 4 eV if 5000 angstrom of light is incident on the metal. Is there any photo electric effect ?

Discussion

1722.	What are the various ways to stop friction?
Answer» What are the various ways to stop friction?

Discussion

1723.	of length L and radus r is heat A solid cylinder upto same temperature as that of a cube of edge length a. If both have same material, volume and allowed to cool under similar conditions, then ratio of amount of radiations radiated will be (Neglect radiation emitted from flat surfaces of the cylinder) 30. 2a rl 3r rL 2rL
Answer» of length L and radus r is heat A solid cylinder upto same temperature as that of a cube of edge length a. If both have same material, volume and allowed to cool under similar conditions, then ratio of amount of radiations radiated will be (Neglect radiation emitted from flat surfaces of the cylinder) 30. 2a rl 3r rL 2rL

Discussion

1724.	Find the number of images formed by the system of plane mirrors arranged as shown in the figure, if the object is placed at ′O′.
Answer» Find the number of images formed by the system of plane mirrors arranged as shown in the figure, if the object is placed at $^{'} O^{'}$ .

Discussion

1725.	Why is writing with a chalk on glass not clear at all ?
Answer» Why is writing with a chalk on glass not clear at all ?

Discussion

1726.	The letter F is placed in front of a plane mirror : (a) How would its image look like when seen in a plane mirror ? (b) What is the name of the phenomenon involved ?
Answer» The letter F is placed in front of a plane mirror : (a) How would its image look like when seen in a plane mirror ? (b) What is the name of the phenomenon involved ?

Discussion

1727.	How can the electric field inside a conductor be zero if we put a charged particle inside the conductor?
Answer» How can the electric field inside a conductor be zero if we put a charged particle inside the conductor?

Discussion

1728.	The distance and displacement between two points for a moving body will be the same when ___
Answer» The distance and displacement between two points for a moving body will be the same when ___

Discussion

1729.	A horse develops a momentum of 6000 N sec while running at 30 m/s. Calculate the mass of the horse.
Answer» A horse develops a momentum of 6000 N sec while running at 30 m/s. Calculate the mass of the horse.

Discussion

1730.	When an insulator of thickness equal to the separation between the plates is introduced between the plates, the potential difference reduces to one-tenth of the original value. The dielectric constant of the material is
Answer» When an insulator of thickness equal to the separation between the plates is introduced between the plates, the potential difference reduces to one-tenth of the original value. The dielectric constant of the material is

Discussion

1731.	What is the speed of sound in vacuum?
Answer» What is the speed of sound in vacuum?

Discussion

1732.	If we release a magnet held in our hand,it falls to the ground. The force responsible for this is: (a) muscular force (b) magnetic force (c) electrostatic force (d) gravitational force
Answer» If we release a magnet held in our hand,it falls to the ground. The force responsible for this is: (a) muscular force (b) magnetic force (c) electrostatic force (d) gravitational force

Discussion

1733.	Question 17On the earth, a stone is thrown from a height in a direction parallel to the earth’s surface while another stone is simultaneously dropped from the same height. Which stone would reach the ground first and why?
Answer» Question 17 On the earth, a stone is thrown from a height in a direction parallel to the earth’s surface while another stone is simultaneously dropped from the same height. Which stone would reach the ground first and why?

Discussion

1734.	Vapour density of mixture of NO_2 and N_2O_4 is 34.5, then percentage abundance (by mol) of NO_2 in mixture
Answer» Vapour density of mixture of NO_2 and N_2O_4 is 34.5, then percentage abundance (by mol) of NO_2 in mixture

Discussion

1735.	A wheel has been described as one of the greatest invention of man. Why?
Answer» A wheel has been described as one of the greatest invention of man. Why?

Discussion

1736.	Two coils of self inductance 4 H and 16 H are wound on the same iron core. The coefficient of mutual inductance for them will be
Answer» Two coils of self inductance $4 H$ and $16 H$ are wound on the same iron core. The coefficient of mutual inductance for them will be

Discussion

1737.	Which star is aligned with the axis of rotation of the earth?
Answer» Which star is aligned with the axis of rotation of the earth?

Discussion

1738.	what is the capaci†an ce of parallel plate capacitor if k1 and k2 are two dielectric medium is present in diagonally
Answer» what is the capaci†an ce of parallel plate capacitor if k1 and k2 are two dielectric medium is present in diagonally

Discussion

1739.	In an unbiased p-n junction, consider the following options: 1. Potential at p is more than that at n. 2. Potential at p is less than that at n. 3. Potential at p is equal to that at n. 4. Potential at p is +ve and that at n is - ve. Chose the correct option!
Answer» In an unbiased p-n junction, consider the following options: 1. Potential at p is more than that at n. 2. Potential at p is less than that at n. 3. Potential at p is equal to that at n. 4. Potential at p is +ve and that at n is - ve. Chose the correct option!

Discussion

1740.	Which of the following devices is useful to the blind?
Answer» Which of the following devices is useful to the blind?

Discussion

1741.	An electrically neutral atom must have:
Answer» An electrically neutral atom must have:

Discussion

1742.	what is plane plorized light?
Answer» what is plane plorized light?

Discussion

1743.	Following are eight incidents from the story but their order is mixed up. Put them in the right sequence.(a) The scientist rushed home anticipating the disappointment of his children.(b) Scientists were working for 12-18 hours at Thumba.(c) The boss consented.(d) Scientists had heavy work pressure but they were loyal.(e) A scientist approached the boss for permission to leave at 5.30 pm to take his children to the exhibition.(f) To his surprise, he learnt that his boss had kept his appointment for him.(g) Suddenly, he remembered his promise to his children.(h) The scientist became so engrossed in his work that he continued working till 8.15 pm.
Answer» Following are eight incidents from the story but their order is mixed up. Put them in the right sequence. (a) The scientist rushed home anticipating the disappointment of his children. (b) Scientists were working for 12-18 hours at Thumba. (c) The boss consented. (d) Scientists had heavy work pressure but they were loyal. (e) A scientist approached the boss for permission to leave at 5.30 pm to take his children to the exhibition. (f) To his surprise, he learnt that his boss had kept his appointment for him. (g) Suddenly, he remembered his promise to his children. (h) The scientist became so engrossed in his work that he continued working till 8.15 pm.

1743.

Following are eight incidents from the story but their order is mixed up. Put them in the right sequence.(a) The scientist rushed home anticipating the disappointment of his children.(b) Scientists were working for 12-18 hours at Thumba.(c) The boss consented.(d) Scientists had heavy work pressure but they were loyal.(e) A scientist approached the boss for permission to leave at 5.30 pm to take his children to the exhibition.(f) To his surprise, he learnt that his boss had kept his appointment for him.(g) Suddenly, he remembered his promise to his children.(h) The scientist became so engrossed in his work that he continued working till 8.15 pm.

Answer»

Following are eight incidents from the story but their order is mixed up. Put them in the right sequence.

(a) The scientist rushed home anticipating the disappointment of his children.

(b) Scientists were working for 12-18 hours at Thumba.

(c) The boss consented.

(d) Scientists had heavy work pressure but they were loyal.

(e) A scientist approached the boss for permission to leave at 5.30 pm to take his children to the exhibition.

(f) To his surprise, he learnt that his boss had kept his appointment for him.

(g) Suddenly, he remembered his promise to his children.

(h) The scientist became so engrossed in his work that he continued working till 8.15 pm.

Discussion

1744.	Name the errors which can have both positive and negative signs
Answer» Name the errors which can have both positive and negative signs

Discussion

1745.	A thin, circular loop of radius R rotates about its vertical diameter with angular speed ω. There is a small bead on the wire. The angle made by radius vector joiningthe centre to the bead with the vertically downward direction for ω=\sqrt{2g/R} is (Neglect friction) (1) 0^° (2) 30^° (3) 45^° (4) 60^°
Answer» A thin, circular loop of radius R rotates about its vertical diameter with angular speed ω. There is a small bead on the wire. The angle made by radius vector joiningthe centre to the bead with the vertically downward direction for ω=\sqrt{2g/R} is (Neglect friction) (1) 0^° (2) 30^° (3) 45^° (4) 60^°

Discussion

1746.	what is special about the magnetic substances,so that they are attracted by a magnet?
Answer» what is special about the magnetic substances,so that they are attracted by a magnet?

Discussion

1747.	63.If gravitational force attract all the bodies why don't we fell ourselves attracting towards the massive building in our surrounding
Answer» 63.If gravitational force attract all the bodies why don't we fell ourselves attracting towards the massive building in our surrounding

Discussion

1748.	A uniform ladder of length 3.25 metre and weighing 250 newton is placed against the smooth vertical wall with its lower end 1.25 m from the wall if coefficient of friction between the ladder and the floor is 0.3 then find the frictional force acting on the ladder at the point of contact between ladder and floor
Answer» A uniform ladder of length 3.25 metre and weighing 250 newton is placed against the smooth vertical wall with its lower end 1.25 m from the wall if coefficient of friction between the ladder and the floor is 0.3 then find the frictional force acting on the ladder at the point of contact between ladder and floor

Discussion

1749.	a copper wire is compressed by 1% calculate %change in resis†an ce
Answer» a copper wire is compressed by 1% calculate %change in resis†an ce

Discussion

1750.	81.Capacity of a parallel plate air capacitor is P.The plate separation is tripled and two dielectric slabs each having thickness equal to initial separation between the two plates and dielectric constant 3 and 4 are introduced between the two plates.Find final capacity of capacitor.
Answer» 81.Capacity of a parallel plate air capacitor is P.The plate separation is tripled and two dielectric slabs each having thickness equal to initial separation between the two plates and dielectric constant 3 and 4 are introduced between the two plates.Find final capacity of capacitor.

Discussion

Explore topic-wise InterviewSolutions in .

why waves transfer energy but not matter

why is it easier to bend a piece of steel than to bend a piece of wood?

The area under velocity – time graph gives________.

What is force? State the various effects of force.

What is the name of the scale used to quantify the size of an earthquake?

In non-inertial frame, the second law of motion is written as _______ , where Fp is a pseudo-force while a is the acceleration of the body relative to non-inertial frame.

calculate force on +2.0microcoulomb of charge due to the two other charges is +7.5 microcoulomb and -3.5microcoulomb of a equilateral triangle

What happens when a negatively charged body is placed on the ground?

If Force=0 then why final velocity = initial velocity ?

What is evaporation? Explain it on the basis of the molecular motion.

degree of freedom of gas(f) for monoatomic gas ,diatomic or polyatomic gases?

Question 26Explain why it is safer to use a wireless telephone instead of a landline telephone during lightning.

29. A: Sodium ions are discharged when aqueous solution of Nacl electrolysed using mercury electrode. R: The nature of electrode can effect the order of discharge of ions.

The origin of all contact forces can be traced to non contact forces. justify this statement

Statement 1: The flow of current in a poor conductor is impossible.Statement 2: Under certain conditions current can flow through a poor conductor.

Define the angle of reflection.

Where did the child find the sea shell? What did the child do with the shell? What did the child hear?

The work function of a metal is 4 eV if 5000 angstrom of light is incident on the metal. Is there any photo electric effect ?

What are the various ways to stop friction?

Find the number of images formed by the system of plane mirrors arranged as shown in the figure, if the object is placed at ′O′.

Why is writing with a chalk on glass not clear at all ?

The letter F is placed in front of a plane mirror : (a) How would its image look like when seen in a plane mirror ? (b) What is the name of the phenomenon involved ?

How can the electric field inside a conductor be zero if we put a charged particle inside the conductor?

The distance and displacement between two points for a moving body will be the same when ___

A horse develops a momentum of 6000 N sec while running at 30 m/s. Calculate the mass of the horse.

When an insulator of thickness equal to the separation between the plates is introduced between the plates, the potential difference reduces to one-tenth of the original value. The dielectric constant of the material is

What is the speed of sound in vacuum?

If we release a magnet held in our hand,it falls to the ground. The force responsible for this is: (a) muscular force (b) magnetic force (c) electrostatic force (d) gravitational force

Question 17On the earth, a stone is thrown from a height in a direction parallel to the earth’s surface while another stone is simultaneously dropped from the same height. Which stone would reach the ground first and why?

Vapour density of mixture of NO_2 and N_2O_4 is 34.5, then percentage abundance (by mol) of NO_2 in mixture

A wheel has been described as one of the greatest invention of man. Why?

Two coils of self inductance 4 H and 16 H are wound on the same iron core. The coefficient of mutual inductance for them will be

Which star is aligned with the axis of rotation of the earth?

what is the capaci†an ce of parallel plate capacitor if k1 and k2 are two dielectric medium is present in diagonally

In an unbiased p-n junction, consider the following options: 1. Potential at p is more than that at n. 2. Potential at p is less than that at n. 3. Potential at p is equal to that at n. 4. Potential at p is +ve and that at n is - ve. Chose the correct option!

Which of the following devices is useful to the blind?

An electrically neutral atom must have:

what is plane plorized light?

Name the errors which can have both positive and negative signs

what is special about the magnetic substances,so that they are attracted by a magnet?

63.If gravitational force attract all the bodies why don't we fell ourselves attracting towards the massive building in our surrounding

a copper wire is compressed by 1% calculate %change in resis†an ce

81.Capacity of a parallel plate air capacitor is P.The plate separation is tripled and two dielectric slabs each having thickness equal to initial separation between the two plates and dielectric constant 3 and 4 are introduced between the two plates.Find final capacity of capacitor.