50278 + Interview Questions in Physics

1.	For velocity – time graph of given figureThe acceleration – time graph of the motion of the body is
Answer» For velocity – time graph of given figure The acceleration – time graph of the motion of the body is

Discussion

2.	Which of the following is a correct representation of the image of a P shaped object placed in front of a plane mirror?
Answer» Which of the following is a correct representation of the image of a $P$ shaped object placed in front of a plane mirror?

Discussion

3.	does initial codition affects motion of charged particle?
Answer» does initial codition affects motion of charged particle?

Discussion

4.	A cantilever beam of span L is subjected to a load W at a distance 'a' from support. It is desired to obtain the vertical displacement at the free end by unit load method. The expression for deflection is
Answer» A cantilever beam of span L is subjected to a load W at a distance 'a' from support. It is desired to obtain the vertical displacement at the free end by unit load method. The expression for deflection is

Discussion

5.	A solid iron pole consists of a cylinder of height 220 cm and base diameter 24 cm, which is surmounted by another cylinder of height 60 cm and radius 8 cm. Find the mass of the pole, given that 1 cm3 of iron has approximately 8 g mass. [Use π = 3.14]
Answer» A solid iron pole consists of a cylinder of height 220 cm and base diameter 24 cm, which is surmounted by another cylinder of height 60 cm and radius 8 cm. Find the mass of the pole, given that 1 cm³ of iron has approximately 8 g mass. [Use π = 3.14]

Discussion

6.	The gravitational potential difference between the surface of a planet and a point 20 m above it is 16 J/kg. Calculate the work done in moving a 2 kg mass by 8 m on a slope of 60∘ from the horizontal.
Answer» The gravitational potential difference between the surface of a planet and a point $20 m$ above it is $16 J/kg$ . Calculate the work done in moving a $2 kg$ mass by $8 m$ on a slope of $60^{\circ}$ from the horizontal.

Discussion

7.	The potential field of an electric field →E=(y^i+x^j) is
Answer» The potential field of an electric field $\to E = (y^i + x^j)$ is

Discussion

8.	A particle of mass 1 g executes an oscillatory motion on the concave surface of a spherical dish of radius 2 m. The particle begins from a point on the dish at a height of 1 cm from the horizontal plane and the coefficient of friction is 0.01. The total distance covered by the particle before it comes to rest is approximately
Answer» A particle of mass $1 g$ executes an oscillatory motion on the concave surface of a spherical dish of radius $2 m$ . The particle begins from a point on the dish at a height of $1 cm$ from the horizontal plane and the coefficient of friction is $0.01$ . The total distance covered by the particle before it comes to rest is approximately

Discussion

9.	A cube of side l has point charges (+q) at each of its vertices except at the origin where the charge is (−q) as shown in the figure. The electric field at the centre of the cube is
Answer» A cube of side $l$ has point charges $(+ q)$ at each of its vertices except at the origin where the charge is $(- q)$ as shown in the figure. The electric field at the centre of the cube is

Discussion

10.	ntThe time of vibration of a dip needle vibration in the vertical plane in the magnetic meridian is 3 sec.When the same magnetic needle is made to vibrate in the horizontal plane,the time of vibration is 3sqrt2 sec.Then the angle of dip will ben nta)90 degreen ntb)60 degreen ntc)45 degreen ntd)30 degreen
Answer» ntThe time of vibration of a dip needle vibration in the vertical plane in the magnetic meridian is 3 sec.When the same magnetic needle is made to vibrate in the horizontal plane,the time of vibration is 3sqrt2 sec.Then the angle of dip will ben nta)90 degreen ntb)60 degreen ntc)45 degreen ntd)30 degreen

Discussion

11.	Careful measurement of the electric field at the surface of a blackbox indicates that the net outward flux through the surface of thebox is 8.0 × 103 Nm2/C. (a) What is the net charge inside the box? (b) If the net outward flux through the surface of the box were zero,could you conclude that there were no charges inside the box? Whyor Why not?
Answer» Careful measurement of the electric field at the surface of a blackbox indicates that the net outward flux through the surface of thebox is 8.0 × 103 Nm2/C. (a) What is the net charge inside the box? (b) If the net outward flux through the surface of the box were zero,could you conclude that there were no charges inside the box? Whyor Why not?

Discussion

12.	Unpolarized light of intensity 32 W m−2 passes through three polarizers such that transmission axis of first is crossed with third. If the intensity of emerging light is 2 W m−2, what is the angle between the transmission axes of the first two polarizers?
Answer» Unpolarized light of intensity $32 {W m}^{- 2}$ passes through three polarizers such that transmission axis of first is crossed with third. If the intensity of emerging light is $2 {W m}^{- 2}$ , what is the angle between the transmission axes of the first two polarizers?

Discussion

13.	Current through the ideal diode as shown in the figure is
Answer» Current through the ideal diode as shown in the figure is

13.

Current through the ideal diode as shown in the figure is

Answer»

Current through the ideal diode as shown in the figure is

Discussion

14.	100 Ω resistance and a capacitor of 100 Ω reactance are connected in series across a 220 V source. The peak value of the displacement current is
Answer» $100 Ω$ resistance and a capacitor of $100 Ω$ reactance are connected in series across a $220 V$ source. The peak value of the displacement current is

Discussion

15.	If θ is angle that vector →A=2^i+3^j+5^k makes with x-z plane then
Answer» If $θ$ is angle that vector $\to A = 2^i + 3^j + 5^k$ makes with x-z plane then

Discussion

16.	Kindly explain Andrews isotherm curve and molecular speeds in gases
Answer» Kindly explain Andrews isotherm curve and molecular speeds in gases

Discussion

17.	54. in arrhenius equation if we make K to be constant then it Will possible that activation energy is directly proportional to temperature or not?
Answer» 54. in arrhenius equation if we make K to be constant then it Will possible that activation energy is directly proportional to temperature or not?

Discussion

18.	The relation between the magnitudes of acceleration of pulley P1 (ap1) and that of pulley P3 (ap3) is
Answer» The relation between the magnitudes of acceleration of pulley $P_{1}$ ( $a_{p_{1}}$ ) and that of pulley $P_{3}$ ( $a_{p_{3}}$ ) is

18.

The relation between the magnitudes of acceleration of pulley P1 (ap1) and that of pulley P3 (ap3) is

Answer»

The relation between the magnitudes of acceleration of pulley $P_{1}$ ( $a_{p_{1}}$ ) and that of pulley $P_{3}$ ( $a_{p_{3}}$ ) is

Discussion

19.	The gravitational field in a region is given by g vector= (2icab +3jcab)N/kg . The work done in moving a particle of mass 1kg from (1,1) to (2,1/3) along the line 3y + 2x =5 is
Answer» The gravitational field in a region is given by g vector= (2icab +3jcab)N/kg . The work done in moving a particle of mass 1kg from (1,1) to (2,1/3) along the line 3y + 2x =5 is

Discussion

20.	A force F=−K(y^i+x^j) (where K is a positive constant) acts on a particle moving in the xy-plane. Starting from the origin, the particle is taken along the positive x-axis to the point (a,0) and then parallel to the y-axis to the point (a,a). The total work done by the force F on the particles is
Answer» A force $F = - K (y^i + x^j)$ (where $K$ is a positive constant) acts on a particle moving in the xy-plane. Starting from the origin, the particle is taken along the positive x-axis to the point $(a, 0)$ and then parallel to the y-axis to the point $(a, a)$ . The total work done by the force $F$ on the particles is

Discussion

21.	Carbon-11 decays to boron-11 according to the following formula. 116C→115B+e++ve+0.96MeV Assume that positrons (e+) produced in the decay combine with free electrons in the atmosphere and annihilate each other almost immediately. Also assume that the neutrinos (ve) are massless and do not intersect with the environment. At t = 0 we have 1 μg of 126C If the half-life of the decay process is t0, the net energy produced between time t = 0 and t=2t0 will be nearly
Answer» Carbon-11 decays to boron-11 according to the following formula. $_{6}^{11} C \to_{5}^{11} B + e^{+} + v_{e} + 0.96 M e V$ Assume that positrons $(e^{+})$ produced in the decay combine with free electrons in the atmosphere and annihilate each other almost immediately. Also assume that the neutrinos $(v_{e})$ are massless and do not intersect with the environment. At t = 0 we have 1 $μ g$ of $_{6}^{12} C$ If the half-life of the decay process is $t_{0}$ , the net energy produced between time t = 0 and $t = 2 t_{0}$ will be nearly

Discussion

22.	Three vectors →P,→Q and →R are such that \|→P\|=\|→Q\|,\|→R\|=√2\|→P\|, and →P+→Q+→R=→0. The angles between →P and →Q,→Q and →R, and →P and →R are
Answer» Three vectors $\to P, \to Q$ and $\to R$ are such that $\| \to P \| = \| \to Q \|, \| \to R \| = \sqrt{2} \| \to P \|$ , and $\to P + \to Q + \to R = \to 0$ . The angles between $\to P$ and $\to Q, \to Q$ and $\to R$ , and $\to P$ and $\to R$ are

Discussion

23.	A metal plate 0.02 m2 in area is lying on a liquid layer of thickness 10−3 m and coefficient of viscosity 140 poise. Calculate the horizontal force needed to move the plate with a speed of 0.040 m/s.
Answer» A metal plate $0.02 m^{2}$ in area is lying on a liquid layer of thickness $10^{- 3} m$ and coefficient of viscosity $140 p o i s e$ . Calculate the horizontal force needed to move the plate with a speed of $0.040 m / s$ .

Discussion

24.	A tranverse wave is described by the equation Y=Y0 sin 2π(ft−x/λ). The maximum particle velocity is equal to four times the wave velocity and Y0=1/π, then value of λ is
Answer» A tranverse wave is described by the equation $Y = Y_{0} s i n 2 π (f t - x / λ)$ . The maximum particle velocity is equal to four times the wave velocity and $Y_{0} = 1 / π$ , then value of $λ$ is

Discussion

25.	Sir,in the above question I asked about 3 vectors to give zero resultant but u gave me answer regarding 2 vectors. So plz rectify it and provide me the needful. I would like repeat the question : CAN THREE VECTORS OF DIFFERENT MAGNITUDE BE COMBINED TO GIVE ZERO RESULTANT? ????
Answer» Sir,in the above question I asked about 3 vectors to give zero resultant but u gave me answer regarding 2 vectors. So plz rectify it and provide me the needful. I would like repeat the question : CAN THREE VECTORS OF DIFFERENT MAGNITUDE BE COMBINED TO GIVE ZERO RESULTANT? ????

Discussion

26.	The charge and mass of a particle are 2 times and 4000 times the charge and mass of an electron respectively, and is at rest. If this particle is accelerated through a potential difference of 5 V then its final kinetic energy will be-
Answer» The charge and mass of a particle are $2$ times and $4000$ times the charge and mass of an electron respectively, and is at rest. If this particle is accelerated through a potential difference of $5 V$ then its final kinetic energy will be-

Discussion

27.	How many time cons†an ts will ellapse before the energy stored in the capacitors reaches half of the equilibrium in a charging RC circuit a)1.23 b)0.69 c)2.46 d)3.6
Answer» How many time cons†an ts will ellapse before the energy stored in the capacitors reaches half of the equilibrium in a charging RC circuit a)1.23 b)0.69 c)2.46 d)3.6

Discussion

28.	An air column at temperature of 51∘C produces 4 beats in one second with a tuning fork. When the temperature of the air column decreases to 16∘C then one beat per second is produced with same tuning fork. The frequency of the tuning fork is
Answer» An air column at temperature of $51^{\circ} C$ produces $4$ beats in one second with a tuning fork. When the temperature of the air column decreases to $16^{\circ} C$ then one beat per second is produced with same tuning fork. The frequency of the tuning fork is

Discussion

29.	V=axywhy the spacing of electric field lines increasing when increasing the values of x and y axis in a plane?
Answer» V=axy why the spacing of electric field lines increasing when increasing the values of x and y axis in a plane?

Discussion

30.	If force F is acting always tangential to the path, and the equation of the path AB is x2=8y and the path BC is straight line, which is tangent on curve AB at point B. If coefficient of friction μ between block and path ABC is 0.5, the work done by force F to move block of mass 2 kg from A to C very slowly is 76a J. Then the value of a is . [Take g = 10 m/s2]. Write upto two digits after the decimal point.
Answer» If force F is acting always tangential to the path, and the equation of the path AB is $x^{2} = 8 y$ and the path BC is straight line, which is tangent on curve AB at point B. If coefficient of friction $μ$ between block and path ABC is 0.5, the work done by force F to move block of mass 2 $k g$ from A to C very slowly is $76 a J$ . Then the value of $a$ is . [Take g = 10 $m / s^{2}$ ]. Write upto two digits after the decimal point.

Discussion

31.	A cyclist taking turn bends inwards while a car passenger taking same turn is thrown outwards. The reason is
Answer» A cyclist taking turn bends inwards while a car passenger taking same turn is thrown outwards. The reason is

Discussion

32.	Slit width in a Young's double slit experiment are in the ratio 9:4. The ratio of intensity at minima to that at maxima, is
Answer» Slit width in a Young's double slit experiment are in the ratio $9 : 4$ . The ratio of intensity at minima to that at maxima, is

Discussion

33.	An electric current is flowing in a very long pin as shown in the figure. The value of magnetic flux density at point O will be-
Answer» An electric current is flowing in a very long pin as shown in the figure. The value of magnetic flux density at point $O$ will be-

Discussion

34.	If the ratio of specific heat of a gas at constant pressure to that at constant volume is γ, the change in internal energy of a mass of gas, when the volume changes from V to 2V at constant pressure P, is :-
Answer» If the ratio of specific heat of a gas at constant pressure to that at constant volume is $γ$ , the change in internal energy of a mass of gas, when the volume changes from $V$ to $2 V$ at constant pressure $P$ , is :-

Discussion

35.	An electron and a proton have the same DeBroglie wavelength. Then the kineitc energy of theelectron is(1) zero(2) Infinity(3) Equal to kinetic energy of proton(4) Greater than the kinetic energy of proton
Answer» An electron and a proton have the same DeBroglie wavelength. Then the kineitc energy of theelectron is(1) zero(2) Infinity(3) Equal to kinetic energy of proton(4) Greater than the kinetic energy of proton

Discussion

36.	a particle is moving in a acircular plane and its positio at an instant is given by 1/root 2 (i+j) . what is its velocity
Answer» a particle is moving in a acircular plane and its positio at an instant is given by 1/root 2 (i+j) . what is its velocity

Discussion

37.	Two charged metallic spheres of radii 2r and 3r are brought into contact and then separated at large distance. ratio of their respective charges is
Answer» Two charged metallic spheres of radii $2 r a n d 3 r$ are brought into contact and then separated at large distance. ratio of their respective charges is

Discussion

38.	A ray of light is incident on a plane mirror along a vector (^i+^j−^k). The normal on incident point is along (^i+^j). The unit vector along the reflected ray is
Answer» A ray of light is incident on a plane mirror along a vector $(^i +^j -^k) .$ The normal on incident point is along $(^i +^j) .$ The unit vector along the reflected ray is

Discussion

39.	Two trains are travelling towards each other both at a speed of 90 km h−1. If one of the trains sounds a whistle at 500 Hz, what will be the apparent frequency heard in the other train ? Speed of sound in air = 350ms−1.
Answer» Two trains are travelling towards each other both at a speed of 90 km $h^{- 1}$ . If one of the trains sounds a whistle at 500 Hz, what will be the apparent frequency heard in the other train ? Speed of sound in air = $350 m s^{- 1}$ .

Discussion

40.	The area of cross-section of a railway track is 0.01 m2 . The temperature variation is 10 ∘C. Coefficient of linear expansion of material of track is 10−5 /∘C. The energy stored per meter in the track is Jm−1. (Young's modulus of material of track is 1011 Nm−2)
Answer» The area of cross-section of a railway track is $0.01 m^{2}$ . The temperature variation is $10^{\circ} C$ . Coefficient of linear expansion of material of track is $10^{- 5} /^{\circ} C$ . The energy stored per meter in the track is ${Jm}^{- 1}$ . (Young's modulus of material of track is $10^{11} {Nm}^{- 2})$

Discussion

41.	A parallel - plat ecapacitor having plate area A and plate separation d is joined to a battery of emf ϵ and internal resistance R at t = 0. Consider a plane surface fo area A2 parallel to the plates and situated symmetrically between them. Find the displacement. current through this surface as a function of time.
Answer» A parallel - plat ecapacitor having plate area A and plate separation d is joined to a battery of emf $ϵ$ and internal resistance R at t = 0. Consider a plane surface fo area $\frac{A}{2}$ parallel to the plates and situated symmetrically between them. Find the displacement. current through this surface as a function of time.

Discussion

42.	The period of oscillation of a simple pendulum of length L is suspended from the ceiling of a vehicle which moves without friction down a fixed inclined plane of inclination α is given by
Answer» The period of oscillation of a simple pendulum of length L is suspended from the ceiling of a vehicle which moves without friction down a fixed inclined plane of inclination $α$ is given by

Discussion

43.	A body of mass 2 kg moves under a force of (2^i+3^j+5^k) N. It starts from rest and was at the origin initially. After 4 s, its new coordinates are (8,b,20). The value of b is .(Round off to the Nearest Integer)
Answer» A body of mass $2 kg$ moves under a force of $(2^i + 3^j + 5^k) N$ . It starts from rest and was at the origin initially. After $4 s$ , its new coordinates are $(8, b, 20)$ . The value of $b$ is . (Round off to the Nearest Integer)

Discussion

44.	What is mean by friction
Answer» What is mean by friction

Discussion

45.	P, Q and R are three coplanar forces acting at apoint and are in equilibrium. Given P = 1 N,1the value ofR issine, 2
Answer» P, Q and R are three coplanar forces acting at apoint and are in equilibrium. Given P = 1 N,1the value ofR issine, 2

Discussion

46.	At what angle of electric dipole moment with uniform electric field, potential energy is maximum??
Answer» At what angle of electric dipole moment with uniform electric field, potential energy is maximum??

Discussion

47.	can the plane mirrors placed inside a periscpe be fitted with angles other than 45degree?
Answer» can the plane mirrors placed inside a periscpe be fitted with angles other than 45degree?

Discussion

48.	Two car A and B are moving towards each other on a straight road with velocity 10 metre per second and 20m/s respectively when they are 150 metre apart then car A deacelerate 5/3 m/s² and car B deacclerated with 10/3 m/s² until they stop in order to avoid collision.If the distance (in m) bw them when they come to rest is 15 * K then find k
Answer» Two car A and B are moving towards each other on a straight road with velocity 10 metre per second and 20m/s respectively when they are 150 metre apart then car A deacelerate 5/3 m/s² and car B deacclerated with 10/3 m/s² until they stop in order to avoid collision.If the distance (in m) bw them when they come to rest is 15 * K then find k

Discussion

49.	A particle is in linear simple harmonic motion between two points, A and B, 10 cm apart. Take the direction from A to B as the positive direction and give the signs of velocity, acceleration and force on the particle when it is (a) at the end A, (b) at the end B, (c) at the mid-point of AB going towards A, (d) at 2 cm away from B going towards A, (e) at 3 cm away from A going towards B, and (f) at 4 cm away from B going towards A.
Answer» A particle is in linear simple harmonic motion between two points, A and B, 10 cm apart. Take the direction from A to B as the positive direction and give the signs of velocity, acceleration and force on the particle when it is (a) at the end A, (b) at the end B, (c) at the mid-point of AB going towards A, (d) at 2 cm away from B going towards A, (e) at 3 cm away from A going towards B, and (f) at 4 cm away from B going towards A.

Discussion

50.	Concentric metallic hollow spheres of radii R and 4R hold charges Q1 and Q2 respectively. Given that surface charge densities of the concentric spheres are equal, the potential difference V(R)−V(4R) is:
Answer» Concentric metallic hollow spheres of radii $R$ and $4 R$ hold charges $Q_{1} and Q_{2}$ respectively. Given that surface charge densities of the concentric spheres are equal, the potential difference $V (R) - V (4 R)$ is:

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

For velocity – time graph of given figureThe acceleration – time graph of the motion of the body is

Which of the following is a correct representation of the image of a P shaped object placed in front of a plane mirror?

does initial codition affects motion of charged particle?

A cantilever beam of span L is subjected to a load W at a distance 'a' from support. It is desired to obtain the vertical displacement at the free end by unit load method. The expression for deflection is

A solid iron pole consists of a cylinder of height 220 cm and base diameter 24 cm, which is surmounted by another cylinder of height 60 cm and radius 8 cm. Find the mass of the pole, given that 1 cm3 of iron has approximately 8 g mass. [Use π = 3.14]

The gravitational potential difference between the surface of a planet and a point 20 m above it is 16 J/kg. Calculate the work done in moving a 2 kg mass by 8 m on a slope of 60∘ from the horizontal.

The potential field of an electric field →E=(y^i+x^j) is

A cube of side l has point charges (+q) at each of its vertices except at the origin where the charge is (−q) as shown in the figure. The electric field at the centre of the cube is

Unpolarized light of intensity 32 W m−2 passes through three polarizers such that transmission axis of first is crossed with third. If the intensity of emerging light is 2 W m−2, what is the angle between the transmission axes of the first two polarizers?

Current through the ideal diode as shown in the figure is

100 Ω resistance and a capacitor of 100 Ω reactance are connected in series across a 220 V source. The peak value of the displacement current is

If θ is angle that vector →A=2^i+3^j+5^k makes with x-z plane then

Kindly explain Andrews isotherm curve and molecular speeds in gases

54. in arrhenius equation if we make K to be constant then it Will possible that activation energy is directly proportional to temperature or not?

The relation between the magnitudes of acceleration of pulley P1 (ap1) and that of pulley P3 (ap3) is

The gravitational field in a region is given by g vector= (2icab +3jcab)N/kg . The work done in moving a particle of mass 1kg from (1,1) to (2,1/3) along the line 3y + 2x =5 is

A force F=−K(y^i+x^j) (where K is a positive constant) acts on a particle moving in the xy-plane. Starting from the origin, the particle is taken along the positive x-axis to the point (a,0) and then parallel to the y-axis to the point (a,a). The total work done by the force F on the particles is

Three vectors →P,→Q and →R are such that |→P|=|→Q|,|→R|=√2|→P|, and →P+→Q+→R=→0. The angles between →P and →Q,→Q and →R, and →P and →R are

A metal plate 0.02 m2 in area is lying on a liquid layer of thickness 10−3 m and coefficient of viscosity 140 poise. Calculate the horizontal force needed to move the plate with a speed of 0.040 m/s.

A tranverse wave is described by the equation Y=Y0 sin 2π(ft−x/λ). The maximum particle velocity is equal to four times the wave velocity and Y0=1/π, then value of λ is

Sir,in the above question I asked about 3 vectors to give zero resultant but u gave me answer regarding 2 vectors. So plz rectify it and provide me the needful. I would like repeat the question : CAN THREE VECTORS OF DIFFERENT MAGNITUDE BE COMBINED TO GIVE ZERO RESULTANT? ????

The charge and mass of a particle are 2 times and 4000 times the charge and mass of an electron respectively, and is at rest. If this particle is accelerated through a potential difference of 5 V then its final kinetic energy will be-

How many time cons†an ts will ellapse before the energy stored in the capacitors reaches half of the equilibrium in a charging RC circuit a)1.23 b)0.69 c)2.46 d)3.6

An air column at temperature of 51∘C produces 4 beats in one second with a tuning fork. When the temperature of the air column decreases to 16∘C then one beat per second is produced with same tuning fork. The frequency of the tuning fork is

V=axywhy the spacing of electric field lines increasing when increasing the values of x and y axis in a plane?

A cyclist taking turn bends inwards while a car passenger taking same turn is thrown outwards. The reason is

Slit width in a Young's double slit experiment are in the ratio 9:4. The ratio of intensity at minima to that at maxima, is

An electric current is flowing in a very long pin as shown in the figure. The value of magnetic flux density at point O will be-

If the ratio of specific heat of a gas at constant pressure to that at constant volume is γ, the change in internal energy of a mass of gas, when the volume changes from V to 2V at constant pressure P, is :-

An electron and a proton have the same DeBroglie wavelength. Then the kineitc energy of theelectron is(1) zero(2) Infinity(3) Equal to kinetic energy of proton(4) Greater than the kinetic energy of proton

a particle is moving in a acircular plane and its positio at an instant is given by 1/root 2 (i+j) . what is its velocity

Two charged metallic spheres of radii 2r and 3r are brought into contact and then separated at large distance. ratio of their respective charges is

A ray of light is incident on a plane mirror along a vector (^i+^j−^k). The normal on incident point is along (^i+^j). The unit vector along the reflected ray is

Two trains are travelling towards each other both at a speed of 90 km h−1. If one of the trains sounds a whistle at 500 Hz, what will be the apparent frequency heard in the other train ? Speed of sound in air = 350ms−1.

The area of cross-section of a railway track is 0.01 m2 . The temperature variation is 10 ∘C. Coefficient of linear expansion of material of track is 10−5 /∘C. The energy stored per meter in the track is Jm−1. (Young's modulus of material of track is 1011 Nm−2)

The period of oscillation of a simple pendulum of length L is suspended from the ceiling of a vehicle which moves without friction down a fixed inclined plane of inclination α is given by

A body of mass 2 kg moves under a force of (2^i+3^j+5^k) N. It starts from rest and was at the origin initially. After 4 s, its new coordinates are (8,b,20). The value of b is .(Round off to the Nearest Integer)

What is mean by friction

P, Q and R are three coplanar forces acting at apoint and are in equilibrium. Given P = 1 N,1the value ofR issine, 2

At what angle of electric dipole moment with uniform electric field, potential energy is maximum??

can the plane mirrors placed inside a periscpe be fitted with angles other than 45degree?

Concentric metallic hollow spheres of radii R and 4R hold charges Q1 and Q2 respectively. Given that surface charge densities of the concentric spheres are equal, the potential difference V(R)−V(4R) is: