9478 + Interview Questions in Physics Page 76 InterviewSolution

3751.	F(x^2) =4x^6+3x^4, then f(5) is equal to?
Answer» F(x^2) =4x^6+3x^4, then f(5) is equal to?

Discussion

3752.	28.: A shop security mirror 5.0m from certain items displayed in the shop produces one-tenth magnification. (a) what is the type of mirror? (b) what is the radius of curvature of the shop security mirror 5.0m from certain items displayed in the shop produces one-tenth magnification.
Answer» 28.: A shop security mirror 5.0m from certain items displayed in the shop produces one-tenth magnification. (a) what is the type of mirror? (b) what is the radius of curvature of the shop security mirror 5.0m from certain items displayed in the shop produces one-tenth magnification.

3752.

28.: A shop security mirror 5.0m from certain items displayed in the shop produces one-tenth magnification. (a) what is the type of mirror? (b) what is the radius of curvature of the shop security mirror 5.0m from certain items displayed in the shop produces one-tenth magnification.

Answer»

28.: A shop security mirror 5.0m from certain items displayed in the shop produces one-tenth magnification.

(a) what is the type of mirror?

(b) what is the radius of curvature of the shop security mirror 5.0m from certain items displayed in the shop produces one-tenth magnification.

Discussion

3753.	Can you tell about Limiting force
Answer» Can you tell about Limiting force

Discussion

3754.	A ray of light strikes a plane mirror XY at an angle of incidence of 65∘, is reflected from this plane mirror and then strikes a second plane mirror YZ placed at right angles to the first mirror. What is the angle of reflection for the mirror YZ?
Answer» A ray of light strikes a plane mirror XY at an angle of incidence of $65^{\circ}$ , is reflected from this plane mirror and then strikes a second plane mirror YZ placed at right angles to the first mirror. What is the angle of reflection for the mirror YZ?

Discussion

3755.	What is common among the given images?
Answer» What is common among the given images?

Discussion

3756.	Why direction of friction is always up in an inclined plane during pure rolling??
Answer» Why direction of friction is always up in an inclined plane during pure rolling??

Discussion

3757.	Among the three scubadivers, who would experience a higher liquid pressure than the others?
Answer» Among the three scubadivers, who would experience a higher liquid pressure than the others?

Discussion

3758.	State reasons for the following statements:(a) Tap water conducts electricity, whereas distilled water does not.(b) For dilution of an acid, acid is added into water and not water into acid.
Answer» State reasons for the following statements: (a) Tap water conducts electricity, whereas distilled water does not. (b) For dilution of an acid, acid is added into water and not water into acid.

3758.

State reasons for the following statements:(a) Tap water conducts electricity, whereas distilled water does not.(b) For dilution of an acid, acid is added into water and not water into acid.

Answer»

State reasons for the following statements:

(a) Tap water conducts electricity, whereas distilled water does not.

(b) For dilution of an acid, acid is added into water and not water into acid.

Discussion

3759.	What a sound does in everyday life?
Answer» What a sound does in everyday life?

Discussion

3760.	The density of water 1.0 g cm−3. The density of iron is 7.8 g cm−3. The density of mercury is of 13.6 g cm−3. Answer the following :(a) Will a piece of an iron float or sink in water?(b) Will a piece of an iron float or sink in mercury?
Answer» The density of water 1.0 g $c m^{-} 3$ . The density of iron is 7.8 g $c m^{-} 3$ . The density of mercury is of 13.6 g $c m^{-} 3$ . Answer the following : (a) Will a piece of an iron float or sink in water? (b) Will a piece of an iron float or sink in mercury?

3760.

The density of water 1.0 g cm−3. The density of iron is 7.8 g cm−3. The density of mercury is of 13.6 g cm−3. Answer the following :(a) Will a piece of an iron float or sink in water?(b) Will a piece of an iron float or sink in mercury?

Answer»

The density of water 1.0 g $c m^{-} 3$ . The density of iron is 7.8 g $c m^{-} 3$ . The density of mercury is of 13.6 g $c m^{-} 3$ . Answer the following :

(a) Will a piece of an iron float or sink in water?

(b) Will a piece of an iron float or sink in mercury?

Discussion

3761.	Electromagnets work on the principle of
Answer» Electromagnets work on the principle of

Discussion

3762.	Change the following celsius temperature to kelvin scale.(i) – 273°C(ii) – 100°C(iii) – 40°C(iv) + 30°C
Answer» Change the following celsius temperature to kelvin scale. (i) – 273°C (ii) – 100°C (iii) – 40°C (iv) + 30°C

Discussion

3763.	A ball of mass 2 kg and another of mass 4 kg are dropped together from a 60 m tall building. After a fall of 30 m, their respective kinetic energies will be in the ratio of:
Answer» A ball of mass $2 k g$ and another of mass $4 k g$ are dropped together from a $60 m$ tall building. After a fall of $30 m$ , their respective kinetic energies will be in the ratio of:

Discussion

3764.	How do we sip liquids using a straw?
Answer» How do we sip liquids using a straw?

Discussion

3765.	A 2kg box sits on a box which sits on a 5kg box.the 5 kg box rests on a table top.what is the normal force exerted on the 5kgbbox by the table top
Answer» A 2kg box sits on a box which sits on a 5kg box.the 5 kg box rests on a table top.what is the normal force exerted on the 5kgbbox by the table top

Discussion

3766.	27.Relation between acceleration and time for an object is given below full. calculate the velocity with which the object is moving at ( t = 0, v =0) a=3t-4t2
Answer» 27.Relation between acceleration and time for an object is given below full. calculate the velocity with which the object is moving at ( t = 0, v =0) a=3t-4t2

Discussion

3767.	1)what is Lorentz force 2)Gluon is mediating particle of which force,is it fundamental 3)what is mass number & charge on anti neutrino 4)what are piones & meons and what are other such parti
Answer» 1)what is Lorentz force 2)Gluon is mediating particle of which force,is it fundamental 3)what is mass number & charge on anti neutrino 4)what are piones & meons and what are other such parti

Discussion

3768.	The gravitational force between two objects is F. If the mass of one of the objects is doubled and the distance between the objects is halved, then the gravitational force would become
Answer» The gravitational force between two objects is $F$ . If the mass of one of the objects is doubled and the distance between the objects is halved, then the gravitational force would become

Discussion

3769.	Why does a man slip when he steps on a banana peel thrown on the road?
Answer» Why does a man slip when he steps on a banana peel thrown on the road?

Discussion

3770.	Friction between two flat surfaces can be reduced by
Answer» Friction between two flat surfaces can be reduced by

Discussion

3771.	48.obtain equation of motion for constant acceleration using method of calculus
Answer» 48.obtain equation of motion for constant acceleration using method of calculus

Discussion

3772.	Explain with the help of a labelled diagram the distribution of magnetic field due to a current through a circular loop. Why is it that if a current carrying coil has ‘n’ turn, the field produced at any point is a times as large as that produced by a single turn? (b)How does an electromagnet differ from a bar magnet or permanent magnet?
Answer» Explain with the help of a labelled diagram the distribution of magnetic field due to a current through a circular loop. Why is it that if a current carrying coil has ‘n’ turn, the field produced at any point is a times as large as that produced by a single turn? (b)How does an electromagnet differ from a bar magnet or permanent magnet?

Discussion

3773.	if a+5=10+b,then any one of a or b can be irrational.tell whether above statment is correct or not . then exaplain why so
Answer» if a+5=10+b,then any one of a or b can be irrational.tell whether above statment is correct or not . then exaplain why so

Discussion

3774.	if pressure at the half depth of lake is equal to 3/4 times the pressure at its bottom then find the depth of lake
Answer» if pressure at the half depth of lake is equal to 3/4 times the pressure at its bottom then find the depth of lake

Discussion

3775.	There is a very big magnet and a very small magnet. If we put the north pole of the big magnet close to the north pole of the small magnet, will they repeal each other?
Answer» There is a very big magnet and a very small magnet. If we put the north pole of the big magnet close to the north pole of the small magnet, will they repeal each other?

Discussion

3776.	18. prooving of root 2 as a irrational number
Answer» 18. prooving of root 2 as a irrational number

Discussion

3777.	Question 9Paheli and Boojho observe a bright object in the night sky which was not twinkling. Paheli says, it is a star and Boojho says it is a planet. Who is correct?
Answer» Question 9 Paheli and Boojho observe a bright object in the night sky which was not twinkling. Paheli says, it is a star and Boojho says it is a planet. Who is correct?

Discussion

3778.	A car travels a distance S on a straight road in two hours and then returns to the starting point in the next three hours. Its average velocity is
Answer» A car travels a distance S on a straight road in two hours and then returns to the starting point in the next three hours. Its average velocity is

Discussion

3779.	State the drawbacks of the law of octave. Give your answer in point form.
Answer» State the drawbacks of the law of octave. Give your answer in point form.

Discussion

3780.	Charge particle are only accelerated when kept in electric field how??
Answer» Charge particle are only accelerated when kept in electric field how??

Discussion

3781.	The resistance of a conductor is said to be 1 ohm if
Answer» The resistance of a conductor is said to be 1 ohm if

Discussion

3782.	Why the force which pushes us up is known as buoyancy? We could give it another name?
Answer» Why the force which pushes us up is known as buoyancy? We could give it another name?

Discussion

3783.	Standing waves are produced in 10m long stretched string. If the string vibrates in 5 segments and wave velocity is 20m/s then its frequency is??
Answer» Standing waves are produced in 10m long stretched string. If the string vibrates in 5 segments and wave velocity is 20m/s then its frequency is??

Discussion

3784.	5.Two ivory balls are placed together at rest. A third Identical ball moving with velocity u in line of first two balls collide head on elastically then A)third ball comes to rest with second ball while first ball moves with speed u B) third ball comes to rest and other two move together with speed u/2 C)all three balls move together with speed u/3 D)all three balls move in such a manner each makes angle 120^° to each other Give reason too for ur choice
Answer» 5.Two ivory balls are placed together at rest. A third Identical ball moving with velocity u in line of first two balls collide head on elastically then A)third ball comes to rest with second ball while first ball moves with speed u B) third ball comes to rest and other two move together with speed u/2 C)all three balls move together with speed u/3 D)all three balls move in such a manner each makes angle 120^° to each other Give reason too for ur choice

Discussion

3785.	speed of the body on reaching the point,from where it was projected vertically upward with velocity u is
Answer» speed of the body on reaching the point,from where it was projected vertically upward with velocity u is

Discussion

3786.	projectile projectile motion
Answer» projectile projectile motion

Discussion

3787.	a point charge carries a point charge +q and is maintained at altitude h over a large conducting uncharged plate. the electric force of interaction of charge and the plate is better described as
Answer» a point charge carries a point charge +q and is maintained at altitude h over a large conducting uncharged plate. the electric force of interaction of charge and the plate is better described as

Discussion

3788.	Describe an experiment to demonstrate that a substance absorbs heat during melting without change in its temperature.
Answer» Describe an experiment to demonstrate that a substance absorbs heat during melting without change in its temperature.

Discussion

3789.	22. 5.6 dm3 of gas at STP requires 52.25 J of heat toXraise its temperature by 10^° C at constant volume.Gas can be(1) Hе(2) H2(3) NO2(4) CO2ollowing
Answer» 22. 5.6 dm3 of gas at STP requires 52.25 J of heat toXraise its temperature by 10^° C at constant volume.Gas can be(1) Hе(2) H2(3) NO2(4) CO2ollowing

Discussion

3790.	What is October heat?
Answer» What is October heat?

Discussion

3791.	what is increase in entropy when 11.2L of O_2 is mixed with 11.2L of H2 at STP? (1) 0.576 J/K (2) 5.76 J/K (3) 7.56 J/K (4) 2.76 J/K HAVEN'T\:unders†an d the solution provided.what is X_{a }and X_{b }in the provided solution?
Answer» what is increase in entropy when 11.2L of O_2 is mixed with 11.2L of H2 at STP? (1) 0.576 J/K (2) 5.76 J/K (3) 7.56 J/K (4) 2.76 J/K HAVEN'T\:unders†an d the solution provided.what is X_{a }and X_{b }in the provided solution?

Discussion

3792.	Is the speed of sound more in water or in steel?
Answer» Is the speed of sound more in water or in steel?

Discussion

3793.	A metallic sheet is of rectangular shape with dimensions 48 m x 36 m. From each of its corners, a square is cut off so as to make an open box. If the length of the square is 8 m, find the volume of the box (in m3).
Answer» A metallic sheet is of rectangular shape with dimensions 48 m x 36 m. From each of its corners, a square is cut off so as to make an open box. If the length of the square is 8 m, find the volume of the box (in m³).

Discussion

3794.	One uses of copper aluminium and hydrogen
Answer» One uses of copper aluminium and hydrogen

Discussion

3795.	Is it possible to do more work by spending less power?
Answer» Is it possible to do more work by spending less power?

Discussion

3796.	The upper half of an inclined plane ofinclination 0 is perfectly smooth while lower half is rough. A block starting from rest at the top of the plane will again come to rest at the bottom, if the coefficient of friction between the block and lower half of the plane is given b
Answer» The upper half of an inclined plane ofinclination 0 is perfectly smooth while lower half is rough. A block starting from rest at the top of the plane will again come to rest at the bottom, if the coefficient of friction between the block and lower half of the plane is given b

Discussion

3797.	A force which acts for a small time and also varies with time is called:
Answer» A force which acts for a small time and also varies with time is called:

Discussion

3798.	Why does static friction require highest amount of force compared to rolling or sliding friction
Answer» Why does static friction require highest amount of force compared to rolling or sliding friction

Discussion

3799.	A block of mass 10 kg is resting on floor. The coefficient of friction between the block and ground is 0.2. What is the amount of force needed to just move the block? (Take acceleration due to gravity, g = 10m/s2.)
Answer» A block of mass $10 k g$ is resting on floor. The coefficient of friction between the block and ground is 0.2. What is the amount of force needed to just move the block? (Take acceleration due to gravity, $g$ = $10 m / s^{2}$ .)

Discussion

3800.	Gurmit wants to observe the variation in the size of the pupil of his friend’s eye by throwing light on it. Can gurmit use a laser torch for this purpose? Explain.
Answer» Gurmit wants to observe the variation in the size of the pupil of his friend’s eye by throwing light on it. Can gurmit use a laser torch for this purpose? Explain.

Discussion

Explore topic-wise InterviewSolutions in .

F(x^2) =4x^6+3x^4, then f(5) is equal to?

28.: A shop security mirror 5.0m from certain items displayed in the shop produces one-tenth magnification. (a) what is the type of mirror? (b) what is the radius of curvature of the shop security mirror 5.0m from certain items displayed in the shop produces one-tenth magnification.

Can you tell about Limiting force

A ray of light strikes a plane mirror XY at an angle of incidence of 65∘, is reflected from this plane mirror and then strikes a second plane mirror YZ placed at right angles to the first mirror. What is the angle of reflection for the mirror YZ?

What is common among the given images?

Why direction of friction is always up in an inclined plane during pure rolling??

Among the three scubadivers, who would experience a higher liquid pressure than the others?

State reasons for the following statements:(a) Tap water conducts electricity, whereas distilled water does not.(b) For dilution of an acid, acid is added into water and not water into acid.

What a sound does in everyday life?

The density of water 1.0 g cm−3. The density of iron is 7.8 g cm−3. The density of mercury is of 13.6 g cm−3. Answer the following :(a) Will a piece of an iron float or sink in water?(b) Will a piece of an iron float or sink in mercury?

Electromagnets work on the principle of

Change the following celsius temperature to kelvin scale.(i) – 273°C(ii) – 100°C(iii) – 40°C(iv) + 30°C

A ball of mass 2 kg and another of mass 4 kg are dropped together from a 60 m tall building. After a fall of 30 m, their respective kinetic energies will be in the ratio of:

How do we sip liquids using a straw?

A 2kg box sits on a box which sits on a 5kg box.the 5 kg box rests on a table top.what is the normal force exerted on the 5kgbbox by the table top

27.Relation between acceleration and time for an object is given below full. calculate the velocity with which the object is moving at ( t = 0, v =0) a=3t-4t2

1)what is Lorentz force 2)Gluon is mediating particle of which force,is it fundamental 3)what is mass number & charge on anti neutrino 4)what are piones & meons and what are other such parti

The gravitational force between two objects is F. If the mass of one of the objects is doubled and the distance between the objects is halved, then the gravitational force would become

Why does a man slip when he steps on a banana peel thrown on the road?

Friction between two flat surfaces can be reduced by

48.obtain equation of motion for constant acceleration using method of calculus

if a+5=10+b,then any one of a or b can be irrational.tell whether above statment is correct or not . then exaplain why so

if pressure at the half depth of lake is equal to 3/4 times the pressure at its bottom then find the depth of lake

There is a very big magnet and a very small magnet. If we put the north pole of the big magnet close to the north pole of the small magnet, will they repeal each other?

18. prooving of root 2 as a irrational number

Question 9Paheli and Boojho observe a bright object in the night sky which was not twinkling. Paheli says, it is a star and Boojho says it is a planet. Who is correct?

A car travels a distance S on a straight road in two hours and then returns to the starting point in the next three hours. Its average velocity is

State the drawbacks of the law of octave. Give your answer in point form.

Charge particle are only accelerated when kept in electric field how??

The resistance of a conductor is said to be 1 ohm if

Why the force which pushes us up is known as buoyancy? We could give it another name?

Standing waves are produced in 10m long stretched string. If the string vibrates in 5 segments and wave velocity is 20m/s then its frequency is??

speed of the body on reaching the point,from where it was projected vertically upward with velocity u is

projectile projectile motion

a point charge carries a point charge +q and is maintained at altitude h over a large conducting uncharged plate. the electric force of interaction of charge and the plate is better described as

Describe an experiment to demonstrate that a substance absorbs heat during melting without change in its temperature.

22. 5.6 dm3 of gas at STP requires 52.25 J of heat toXraise its temperature by 10^° C at constant volume.Gas can be(1) Hе(2) H2(3) NO2(4) CO2ollowing

What is October heat?

what is increase in entropy when 11.2L of O_2 is mixed with 11.2L of H2 at STP? (1) 0.576 J/K (2) 5.76 J/K (3) 7.56 J/K (4) 2.76 J/K HAVEN'T\:unders†an d the solution provided.what is X_{a }and X_{b }in the provided solution?

Is the speed of sound more in water or in steel?

A metallic sheet is of rectangular shape with dimensions 48 m x 36 m. From each of its corners, a square is cut off so as to make an open box. If the length of the square is 8 m, find the volume of the box (in m3).

One uses of copper aluminium and hydrogen

Is it possible to do more work by spending less power?

The upper half of an inclined plane ofinclination 0 is perfectly smooth while lower half is rough. A block starting from rest at the top of the plane will again come to rest at the bottom, if the coefficient of friction between the block and lower half of the plane is given b

A force which acts for a small time and also varies with time is called:

Why does static friction require highest amount of force compared to rolling or sliding friction

A block of mass 10 kg is resting on floor. The coefficient of friction between the block and ground is 0.2. What is the amount of force needed to just move the block? (Take acceleration due to gravity, g = 10m/s2.)

Gurmit wants to observe the variation in the size of the pupil of his friend’s eye by throwing light on it. Can gurmit use a laser torch for this purpose? Explain.