50278 + Interview Questions in Physics

1.	Let →a=^i+^j+^k, →b=^i−^j+^k and →c=^i−^j−^k be three vectors. A vector →v in the plane of →a and →b, whose projection on →c is 2√3, is given by
Answer» Let $\to a =^i +^j +^k$ , $\to b =^i -^j +^k$ and $\to c =^i -^j -^k$ be three vectors. A vector $\to v$ in the plane of $\to a$ and $\to b$ , whose projection on $\to c$ is $\frac{2}{\sqrt{3}}$ , is given by

Discussion

2.	Two cars of unequal masses use same tyres.If they are moving with same initial speed the minimum stopping dis†an ce is: a)Is smaller for the heavier car b)Smaller for the lighter car c)Is same for both d)Depends on their volum
Answer» Two cars of unequal masses use same tyres.If they are moving with same initial speed the minimum stopping dis†an ce is: a)Is smaller for the heavier car b)Smaller for the lighter car c)Is same for both d)Depends on their volum

Discussion

3.	A wave travelling in the +ve x− direction, having displacement along y−direction as 1 m, wavelength 2π m and frequency of 1π Hz, is represented by-
Answer» A wave travelling in the +ve $x -$ direction, having displacement along $y -$ direction as $1 m,$ wavelength $2 π m$ and frequency of $\frac{1}{π} Hz,$ is represented by-

Discussion

4.	A source emitting sound of frequency 125 hertz is placed in front of a wall distance of 3 m from it has detected is also placed in front of the wall at same distance from wall if the time between the sound receive directly from the source and sound reflected from the wall is 8 m/s then find the distance between source and detector speed of sound in 250 m/s.
Answer» A source emitting sound of frequency 125 hertz is placed in front of a wall distance of 3 m from it has detected is also placed in front of the wall at same distance from wall if the time between the sound receive directly from the source and sound reflected from the wall is 8 m/s then find the distance between source and detector speed of sound in 250 m/s.

Discussion

5.	What is the “misadventure” that William Douglas speaks about?
Answer» What is the “misadventure” that William Douglas speaks about?

Discussion

6.	What is the SI unit of temperature?
Answer» What is the SI unit of temperature?

Discussion

7.	A body dropped from a height H reaches the ground with a speed of 1.2 √gH.Calculate the work doneby air-friction.
Answer» A body dropped from a height H reaches the ground with a speed of 1.2 $\sqrt{g H}$ .Calculate the work doneby air-friction.

Discussion

8.	The linear speed of a uniform spherical shell after rolling down an inclined plane of vertical height h from rest, is (assume no slipping):
Answer» The linear speed of a uniform spherical shell after rolling down an inclined plane of vertical height $h$ from rest, is (assume no slipping):

Discussion

9.	Two satellites S1 and S2 revolve round a planet in coplanar circular orbits in the same sense. Their periods of revolution are 1h and 8h respectively. The radius of orbit of S1 is 104km. The speed of S2 relative to S1 when S2 is closest to S1 , is ___ km h−1
Answer» Two satellites $S_{1}$ and $S_{2}$ revolve round a planet in coplanar circular orbits in the same sense. Their periods of revolution are 1h and 8h respectively. The radius of orbit of $S_{1}$ is $10^{4} k m$ . The speed of $S_{2}$ relative to $S_{1}$ when $S_{2}$ is closest to $S_{1}$ , is ___ $k m h^{- 1}$

Discussion

10.	Consider the cylindrical region of the magnetic field shown in the figure. Region I and II have fields directed perpendicularly outward and inward, respectively. Fields are varying with time asRegion I:B1=3B0tRegion II:B2=B0tFind the ratio r1r2 providing there is no net induced electric field in the region outside the magnetic field.
Answer» Consider the cylindrical region of the magnetic field shown in the figure. Region $I$ and $I I$ have fields directed perpendicularly outward and inward, respectively. Fields are varying with time as Region $I : B_{1} = 3 B_{0} t$ Region $I I : B_{2} = B_{0} t$ Find the ratio $\frac{r_{1}}{r_{2}}$ providing there is no net induced electric field in the region outside the magnetic field.

Discussion

11.	ntA metallic ring is dropped down, keeping its plane perpendicular to a constant and horizontal magnetic field. The ring enters the field region at t=0 and completely emerges out at t=T seconds.The current in the ring varies as(graphical presentation)n ntn
Answer» ntA metallic ring is dropped down, keeping its plane perpendicular to a constant and horizontal magnetic field. The ring enters the field region at t=0 and completely emerges out at t=T seconds.The current in the ring varies as(graphical presentation)n ntn

Discussion

12.	Two bodies m1and m2 are kept on a table with coefficient of friction 'μ' and are joined by a spring initially, the spring is in its relaxed state. Find out the minimum force F which will make the other block m2 move.(K is the spring constant).
Answer» Two bodies m₁and m₂ are kept on a table with coefficient of friction ' $μ$ ' and are joined by a spring initially, the spring is in its relaxed state. Find out the minimum force F which will make the other block $m_{2}$ move.(K is the spring constant).

Discussion

13.	A man travelling in a car with a maximum constant speed of 20 m/s watches the friend start off at a distance 100 m/s ahead on a motor cycle with constant acceleration ‘a′. The maximum value of ‘a′ for which the man in the car can reach his friend is
Answer» A man travelling in a car with a maximum constant speed of $20 m/s$ watches the friend start off at a distance $100 m/s$ ahead on a motor cycle with constant acceleration $‘ a^{'}$ . The maximum value of $‘ a^{'}$ for which the man in the car can reach his friend is

Discussion

14.	28.Arrange in terms of stability order H2,Li2 ,B2
Answer» 28.Arrange in terms of stability order H2,Li2 ,B2

Discussion

15.	a particle passes a given point moving downward with a velocity of 50m/s.how long before this was it moving upward at the same rat
Answer» a particle passes a given point moving downward with a velocity of 50m/s.how long before this was it moving upward at the same rat

Discussion

16.	The potential difference between the ends of a resistance R is VR, between the ends of capacitor is VC=2VR and between the ends of inductor is VL=3VR, then the alternating potential of the source in terms of VR will be –
Answer» The potential difference between the ends of a resistance R is $V_{R}$ , between the ends of capacitor is $V_{C} = 2 V_{R}$ and between the ends of inductor is $V_{L} = 3 V_{R}$ , then the alternating potential of the source in terms of $V_{R}$ will be –

Discussion

17.	Two coherent sources of sound, S1 and S2, produce sound waves of the same wavelength λ=1 m, in phase. S1 and S2 are placed 1.5 m apart (see fig.). A listener, located at L, directly in front of S2 finds that the intensity is a minimum where he is 2 m away S2. The listener moves away from S1, keeping his distance from S2 fixed. The adjacent maximum of intensity is observed when the listener is at a distance d from S1. Then d is
Answer» Two coherent sources of sound, $S_{1}$ and $S_{2}$ , produce sound waves of the same wavelength $λ = 1 m$ , in phase. $S_{1}$ and $S_{2}$ are placed $1.5 m$ apart (see fig.). A listener, located at $L$ , directly in front of $S_{2}$ finds that the intensity is a minimum where he is $2 m$ away $S_{2}$ . The listener moves away from $S_{1}$ , keeping his distance from $S_{2}$ fixed. The adjacent maximum of intensity is observed when the listener is at a distance $d$ from $S_{1}$ . Then $d$ is

Discussion

18.	Find the flux through the curved surface of a given cylindrical Gaussian surface around a point charge +9 nC kept at centre at the axis.(Take ϵo=9×10−12 C2/N-m2)
Answer» Find the flux through the curved surface of a given cylindrical Gaussian surface around a point charge $+ 9 nC$ kept at centre at the axis. (Take $ϵ_{o} = 9 \times 10^{- 12} C^{2} / {N-m}^{2}$ )

Discussion

19.	If the time of flight of a bullet over a horizontal range R is T, then inclination of the direction of projection with the horizontal is
Answer» If the time of flight of a bullet over a horizontal range $R$ is $T$ , then inclination of the direction of projection with the horizontal is

Discussion

20.	A square plate of uniform thickness has moment of inertia I about an axis passing through its center mass and perpendicular to its plane. Now it is cut in to four identical square plates. The moment of inertia of each of the smaller plates, about an axis passing through its center of mass and perpendicular to its plane is
Answer» A square plate of uniform thickness has moment of inertia I about an axis passing through its center mass and perpendicular to its plane. Now it is cut in to four identical square plates. The moment of inertia of each of the smaller plates, about an axis passing through its center of mass and perpendicular to its plane is

Discussion

21.	A body of mass 1 kg moving with a velocity of 5 m/s hits a spring on its free end. The other end of spring is fixed and it has a force constant of 400 N/m. The body comes to rest after compressing the spring by 'x' m, the value of 'x' m is
Answer» A body of mass $1 kg$ moving with a velocity of $5 m/s$ hits a spring on its free end. The other end of spring is fixed and it has a force constant of $400 N/m$ . The body comes to rest after compressing the spring by ' $x$ ' $m$ , the value of ' $x$ ' $m$ is

Discussion

22.	Find the accelerations a1,a2 and a3 of the three blocks as shown in figure, if a horizontal force of 10 N is applied on the 3 kg block. The coefficient of static friction (μ) for all contact surfaces are shown in the figure. Take g=10 m/s2.
Answer» Find the accelerations $a_{1}, a_{2}$ and $a_{3}$ of the three blocks as shown in figure, if a horizontal force of $10 N$ is applied on the $3 kg$ block. The coefficient of static friction ( $μ$ ) for all contact surfaces are shown in the figure. Take $g = 10 {m/s}^{2}$ .

Discussion

23.	69.An infinite sheet of width d is lying in a horizontal plane . A point charge q is kept at a perpendicular sepration of d/2 from the centre of the sheet. Electric flux due to this point charge q passing through the given sheet is
Answer» 69.An infinite sheet of width d is lying in a horizontal plane . A point charge q is kept at a perpendicular sepration of d/2 from the centre of the sheet. Electric flux due to this point charge q passing through the given sheet is

Discussion

24.	The vertices of a quadrialteral are A(1,2,−1), B(−4,2,−2), C(4,1,−5) and D(2,−1,3). Forces of magnitudes 2N, 3N, 2N are acting at point A along the lines AB, AC and AD respectively. Their resultant is:
Answer» The vertices of a quadrialteral are $A (1, 2, - 1), B (- 4, 2, - 2), C (4, 1, - 5)$ and $D (2, - 1, 3)$ . Forces of magnitudes $2 N, 3 N, 2 N$ are acting at point $A$ along the lines $A B, A C$ and $A D$ respectively. Their resultant is:

Discussion

25.	A stationary uniform rod of mass m=1 kg and length l=2 m leans against a smooth vertical wall making an angle θ=45o with rough horizontal floor. Find the frictional force that is exerted by the floor on the rod.
Answer» A stationary uniform rod of mass $m = 1 kg$ and length $l = 2 m$ leans against a smooth vertical wall making an angle $θ = 45^{o}$ with rough horizontal floor. Find the frictional force that is exerted by the floor on the rod.

Discussion

26.	38.Four persons P, Q, R and S are initially at the four corners of a square of side d. Each person now moveswith a constant speed v in such a way that P always moves directly towards Q, Q towards R, R towards S,and S towards P.Then find the relative velocity between successive person. Click here to view details:
Answer» 38.Four persons P, Q, R and S are initially at the four corners of a square of side d. Each person now moveswith a constant speed v in such a way that P always moves directly towards Q, Q towards R, R towards S,and S towards P.Then find the relative velocity between successive person. Click here to view details:

Discussion

27.	Plot a graph between force vs 1/r(square) for each pair of charges given below: Pair 1: 1C &\:2C Pair 2: 2C & (-3C)
Answer» Plot a graph between force vs 1/r(square) for each pair of charges given below: Pair 1: 1C &\:2C Pair 2: 2C & (-3C)

Discussion

28.	N molecules each of mass m of gas A and 2N molecules each of mass 2m of gas B are contained in the same vessel at temperature T. The mean square of the velocity of molecules of gas B is v2 and the mean square of x component of the velocity of moleccules of gas A is w2. The ratio w2v2 is
Answer» $N$ molecules each of mass $m$ of gas A and $2 N$ molecules each of mass $2 m$ of gas B are contained in the same vessel at temperature T. The mean square of the velocity of molecules of gas B is $v^{2}$ and the mean square of x component of the velocity of moleccules of gas A is $w^{2}$ . The ratio $\frac{w^{2}}{v^{2}}$ is

Discussion

29.	Speed of light in vacuum is 3×108 m/s. The range of wavelength of visible light is 4000 A∘−7000 A∘. Then, what will be the range of frequency of visible light?
Answer» Speed of light in vacuum is $3 \times 10^{8} m/s$ . The range of wavelength of visible light is $4000 A^{\circ} - 7000 A^{\circ}$ . Then, what will be the range of frequency of visible light?

Discussion

30.	A thin spherical shell of radius R lying on a rough horizontal surface is hit sharply and horizontally by a cue. Where should it be hit so that the shell does not slip on the surface ?
Answer» A thin spherical shell of radius R lying on a rough horizontal surface is hit sharply and horizontally by a cue. Where should it be hit so that the shell does not slip on the surface ?

Discussion

31.	A taxi leaves the stations X for station Y every 10mins.simul†an eously ,a taxi leaves the station Y for station X every 10mins.The taxis move at same cons†an t speed and go from XtoY or viceversa in 2 hours.how many txis coming from the other side will each taxi meet enroute from Y to
Answer» A taxi leaves the stations X for station Y every 10mins.simul†an eously ,a taxi leaves the station Y for station X every 10mins.The taxis move at same cons†an t speed and go from XtoY or viceversa in 2 hours.how many txis coming from the other side will each taxi meet enroute from Y to

Discussion

32.	Calculate the total torque acting on the body shown in figure about the point O.
Answer» Calculate the total torque acting on the body shown in figure about the point $O$ .

32.

Calculate the total torque acting on the body shown in figure about the point O.

Answer»

Calculate the total torque acting on the body shown in figure about the point $O$ .

Discussion

33.	The wavelength of L-alpha characteristic X-Ray is :
Answer» The wavelength of L-alpha characteristic X-Ray is :

Discussion

34.	Why is the Base thicker in a transistor?
Answer» Why is the Base thicker in a transistor?

Discussion

35.	17.A point charge Q is located on the axis of a disc of radius R at a distance b from the plane of the disc (figure). Show that if one fourth of the electric flux from the charge passes through the disc, then R = b(under root 3).
Answer» 17.A point charge Q is located on the axis of a disc of radius R at a distance b from the plane of the disc (figure). Show that if one fourth of the electric flux from the charge passes through the disc, then R = b(under root 3).

Discussion

36.	Find the vectorequation of a plane which is at a distance of 7 units from the originand normal to the vector.
Answer» Find the vector equation of a plane which is at a distance of 7 units from the origin and normal to the vector.

Discussion

37.	assuming bohr model for Li++ atom the first excitation energy of ground state of Li++ atom is
Answer» assuming bohr model for Li++ atom the first excitation energy of ground state of Li++ atom is

Discussion

38.	A synchronous generator is loaded and the armature current lags behind the excitation emf by angle of 40∘. The electrical angle between field axis and the axis of armature reaction field will be_______degrees.130
Answer» A synchronous generator is loaded and the armature current lags behind the excitation emf by angle of $40^{\circ}$ . The electrical angle between field axis and the axis of armature reaction field will be_______degrees. 130

Discussion

39.	A ladder 2.5 m long and of weight 150 N has its centre of gravity 1 m from its bottom. A weight of 40 N is attached to the top end. The work done in raising the ladder from the horizontal to vertical position is
Answer» A ladder $2.5 m$ long and of weight $150 N$ has its centre of gravity $1 m$ from its bottom. A weight of $40 N$ is attached to the top end. The work done in raising the ladder from the horizontal to vertical position is

Discussion

40.	A particle is describing the circular path of radius20 m in every 2 s. The average acceleration of theparticle during 1 s is
Answer» A particle is describing the circular path of radius20 m in every 2 s. The average acceleration of theparticle during 1 s is

Discussion

41.	Show that the wavelength of electromagnetic radiation is equal to the de Broglie wavelength of its quantum (photon).
Answer» Show that the wavelength of electromagnetic radiation is equal to the de Broglie wavelength of its quantum (photon).

Discussion

42.	For V−T diagrams of two process ab and cd shown in figure for same gas, match the following two columns and find the correct option. Column IColumn II(a) Work done(p) is more in process ab(b) Change in internal energy(q) is more in process cd(c) Heat exchange(r) is same in both process(d) Molar heat capacity(s) can't say anything
Answer» For $V - T$ diagrams of two process $a b$ and $c d$ shown in figure for same gas, match the following two columns and find the correct option. $\begin{matrix} Column I & Column II (a) Work done & (p) is more in process ab (b) Change in internal energy & (q) is more in process cd (c) Heat exchange & (r) is same in both process (d) Molar heat capacity & (s) can't say anything \end{matrix}$

Discussion

43.	If in a vernier caliper 10 VSD coincides with 8 MSD, then the least count of vernier caliper is (given 1 MSD = 1 mm)
Answer» If in a vernier caliper 10 VSD coincides with 8 MSD, then the least count of vernier caliper is (given 1 MSD = 1 mm)

Discussion

44.	A satellite orbiting close to the surface of earth does not fall down because the gravitational force
Answer» A satellite orbiting close to the surface of earth does not fall down because the gravitational force

Discussion

45.	The position of a projectile launched from the origin at t=0 is given by →r=(40^i+50^j) m at t=2 s. If the projectile was launched at an angle θ from the horizontal, then θ is (Take g=10 ms−2)
Answer» The position of a projectile launched from the origin at $t = 0$ is given by $\to r = (40^i + 50^j) m$ at $t = 2 s$ . If the projectile was launched at an angle $θ$ from the horizontal, then $θ$ is $(Take g = 10 {ms}^{- 2})$

Discussion

46.	A water pump is used to deliver the water at constant rate. How should the power of pump be increased so that the rate at which water is delivered is increased x times
Answer» A water pump is used to deliver the water at constant rate. How should the power of pump be increased so that the rate at which water is delivered is increased x times

Discussion

47.	Light of intensity 10−5 Wm−2 falls on a sodium photo-cell of surface area 2 cm2. Assuming that the top 5 layers of sodium absorb the incident energy, estimate the time required for photoelectric emission in the wave-picture of radiation. The work function for the metal is given to be about 2 eV. The atomic area of the sodium atom, Ae is 10−20 m2
Answer» Light of intensity $10^{- 5} {Wm}^{- 2}$ falls on a sodium photo-cell of surface area $2 {cm}^{2}$ . Assuming that the top $5$ layers of sodium absorb the incident energy, estimate the time required for photoelectric emission in the wave-picture of radiation. The work function for the metal is given to be about $2 eV$ . The atomic area of the sodium atom, $A_{e}$ is $10^{- 20} m^{2}$

Discussion

48.	The signal x(t)=cos(5πt)+0.5cos(10πt) is instaneously sampled. The interval between the sample is Ts. The maximum allowable value for Ts is ____ sec. 0.1
Answer» The signal $x (t) = c o s (5 π t) + 0.5 c o s (10 π t)$ is instaneously sampled. The interval between the sample is $T_{s}$ . The maximum allowable value for $T_{s}$ is ____ sec. 0.1

Discussion

49.	34.a conducting ring of radius 1 meter is placed in an uniform magnetic field B of 0.01 tesla oscillation with frequency 100 hz with its plane at right angle to B.What will be the induced electric field?
Answer» 34.a conducting ring of radius 1 meter is placed in an uniform magnetic field B of 0.01 tesla oscillation with frequency 100 hz with its plane at right angle to B.What will be the induced electric field?

Discussion

50.	Figure2.34 shows a charge array known as an electricquadrupole. For a point on the axisof the quadrupole, obtain the dependence of potential on rfor r/a>> 1, and contrast yourresults with that due to an electric dipole, and an electric monopole(i.e., a single charge).
Answer» Figure 2.34 shows a charge array known as an electric quadrupole. For a point on the axis of the quadrupole, obtain the dependence of potential on r for r/a >> 1, and contrast your results with that due to an electric dipole, and an electric monopole (i.e., a single charge).

50.

Figure2.34 shows a charge array known as an electricquadrupole. For a point on the axisof the quadrupole, obtain the dependence of potential on rfor r/a>> 1, and contrast yourresults with that due to an electric dipole, and an electric monopole(i.e., a single charge).

Answer»

Figure
2.34 shows a charge array known as an electric
quadrupole. For a point on the axis
of the quadrupole, obtain the dependence of potential on r
for r/a
>> 1, and contrast your
results with that due to an electric dipole, and an electric monopole
(i.e., a single charge).

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Let →a=^i+^j+^k, →b=^i−^j+^k and →c=^i−^j−^k be three vectors. A vector →v in the plane of →a and →b, whose projection on →c is 2√3, is given by

Two cars of unequal masses use same tyres.If they are moving with same initial speed the minimum stopping dis†an ce is: a)Is smaller for the heavier car b)Smaller for the lighter car c)Is same for both d)Depends on their volum

A wave travelling in the +ve x− direction, having displacement along y−direction as 1 m, wavelength 2π m and frequency of 1π Hz, is represented by-

What is the “misadventure” that William Douglas speaks about?

What is the SI unit of temperature?

A body dropped from a height H reaches the ground with a speed of 1.2 √gH.Calculate the work doneby air-friction.

The linear speed of a uniform spherical shell after rolling down an inclined plane of vertical height h from rest, is (assume no slipping):

Two satellites S1 and S2 revolve round a planet in coplanar circular orbits in the same sense. Their periods of revolution are 1h and 8h respectively. The radius of orbit of S1 is 104km. The speed of S2 relative to S1 when S2 is closest to S1 , is ___ km h−1

ntA metallic ring is dropped down, keeping its plane perpendicular to a constant and horizontal magnetic field. The ring enters the field region at t=0 and completely emerges out at t=T seconds.The current in the ring varies as(graphical presentation)n ntn

Two bodies m1and m2 are kept on a table with coefficient of friction 'μ' and are joined by a spring initially, the spring is in its relaxed state. Find out the minimum force F which will make the other block m2 move.(K is the spring constant).

A man travelling in a car with a maximum constant speed of 20 m/s watches the friend start off at a distance 100 m/s ahead on a motor cycle with constant acceleration ‘a′. The maximum value of ‘a′ for which the man in the car can reach his friend is

28.Arrange in terms of stability order H2,Li2 ,B2

a particle passes a given point moving downward with a velocity of 50m/s.how long before this was it moving upward at the same rat

The potential difference between the ends of a resistance R is VR, between the ends of capacitor is VC=2VR and between the ends of inductor is VL=3VR, then the alternating potential of the source in terms of VR will be –

Find the flux through the curved surface of a given cylindrical Gaussian surface around a point charge +9 nC kept at centre at the axis.(Take ϵo=9×10−12 C2/N-m2)

If the time of flight of a bullet over a horizontal range R is T, then inclination of the direction of projection with the horizontal is

A body of mass 1 kg moving with a velocity of 5 m/s hits a spring on its free end. The other end of spring is fixed and it has a force constant of 400 N/m. The body comes to rest after compressing the spring by 'x' m, the value of 'x' m is

Find the accelerations a1,a2 and a3 of the three blocks as shown in figure, if a horizontal force of 10 N is applied on the 3 kg block. The coefficient of static friction (μ) for all contact surfaces are shown in the figure. Take g=10 m/s2.

69.An infinite sheet of width d is lying in a horizontal plane . A point charge q is kept at a perpendicular sepration of d/2 from the centre of the sheet. Electric flux due to this point charge q passing through the given sheet is

The vertices of a quadrialteral are A(1,2,−1), B(−4,2,−2), C(4,1,−5) and D(2,−1,3). Forces of magnitudes 2N, 3N, 2N are acting at point A along the lines AB, AC and AD respectively. Their resultant is:

A stationary uniform rod of mass m=1 kg and length l=2 m leans against a smooth vertical wall making an angle θ=45o with rough horizontal floor. Find the frictional force that is exerted by the floor on the rod.

Plot a graph between force vs 1/r(square) for each pair of charges given below: Pair 1: 1C &\:2C Pair 2: 2C & (-3C)

N molecules each of mass m of gas A and 2N molecules each of mass 2m of gas B are contained in the same vessel at temperature T. The mean square of the velocity of molecules of gas B is v2 and the mean square of x component of the velocity of moleccules of gas A is w2. The ratio w2v2 is

Speed of light in vacuum is 3×108 m/s. The range of wavelength of visible light is 4000 A∘−7000 A∘. Then, what will be the range of frequency of visible light?

A thin spherical shell of radius R lying on a rough horizontal surface is hit sharply and horizontally by a cue. Where should it be hit so that the shell does not slip on the surface ?

A taxi leaves the stations X for station Y every 10mins.simul†an eously ,a taxi leaves the station Y for station X every 10mins.The taxis move at same cons†an t speed and go from XtoY or viceversa in 2 hours.how many txis coming from the other side will each taxi meet enroute from Y to

Calculate the total torque acting on the body shown in figure about the point O.

The wavelength of L-alpha characteristic X-Ray is :

Why is the Base thicker in a transistor?

17.A point charge Q is located on the axis of a disc of radius R at a distance b from the plane of the disc (figure). Show that if one fourth of the electric flux from the charge passes through the disc, then R = b(under root 3).

Find the vectorequation of a plane which is at a distance of 7 units from the originand normal to the vector.

assuming bohr model for Li++ atom the first excitation energy of ground state of Li++ atom is

A synchronous generator is loaded and the armature current lags behind the excitation emf by angle of 40∘. The electrical angle between field axis and the axis of armature reaction field will be_______degrees.130

A ladder 2.5 m long and of weight 150 N has its centre of gravity 1 m from its bottom. A weight of 40 N is attached to the top end. The work done in raising the ladder from the horizontal to vertical position is

A particle is describing the circular path of radius20 m in every 2 s. The average acceleration of theparticle during 1 s is

Show that the wavelength of electromagnetic radiation is equal to the de Broglie wavelength of its quantum (photon).

If in a vernier caliper 10 VSD coincides with 8 MSD, then the least count of vernier caliper is (given 1 MSD = 1 mm)

A satellite orbiting close to the surface of earth does not fall down because the gravitational force

The position of a projectile launched from the origin at t=0 is given by →r=(40^i+50^j) m at t=2 s. If the projectile was launched at an angle θ from the horizontal, then θ is (Take g=10 ms−2)

A water pump is used to deliver the water at constant rate. How should the power of pump be increased so that the rate at which water is delivered is increased x times

The signal x(t)=cos(5πt)+0.5cos(10πt) is instaneously sampled. The interval between the sample is Ts. The maximum allowable value for Ts is ____ sec. 0.1

34.a conducting ring of radius 1 meter is placed in an uniform magnetic field B of 0.01 tesla oscillation with frequency 100 hz with its plane at right angle to B.What will be the induced electric field?

Figure2.34 shows a charge array known as an electricquadrupole. For a point on the axisof the quadrupole, obtain the dependence of potential on rfor r/a&gt;&gt; 1, and contrast yourresults with that due to an electric dipole, and an electric monopole(i.e., a single charge).

Figure2.34 shows a charge array known as an electricquadrupole. For a point on the axisof the quadrupole, obtain the dependence of potential on rfor r/a>> 1, and contrast yourresults with that due to an electric dipole, and an electric monopole(i.e., a single charge).