50278 + Interview Questions in Physics

1.	The graph between √Ek and 1P is(Ek = kinetic energy and P= linear momentum)
Answer» The graph between $\sqrt{E_{k}}$ and $\frac{1}{P}$ is $(E_{k}$ = kinetic energy and $P =$ linear momentum)

Discussion

2.	what is the difference between incident light and incident radiation
Answer» what is the difference between incident light and incident radiation

Discussion

3.	A streamer moves with velocity 3km/h against the direction of river water whose velocity is 2 km/h. The total time taken for the journey if the boat travel 3 km in direction of the stream and then back to its place is?
Answer» A streamer moves with velocity 3km/h against the direction of river water whose velocity is 2 km/h. The total time taken for the journey if the boat travel 3 km in direction of the stream and then back to its place is?

Discussion

4.	What is happening to the velocity of the ball vertically projected up throughout its journey?
Answer» What is happening to the velocity of the ball vertically projected up throughout its journey?

Discussion

5.	The value of ∫cotx√5+9cot2xdx is equal to(where C is constant of integration)
Answer» The value of $\int \frac{cot x}{\sqrt{5 + 9 {cot}^{2} x}} d x$ is equal to (where $C$ is constant of integration)

Discussion

6.	The values of L and R in LCR circuit are 1 mH and 10 Ω respectively. What is the value of its bandwidth?
Answer» The values of $L$ and $R$ in $L C R$ circuit are $1 m H$ and $10 Ω$ respectively. What is the value of its bandwidth?

Discussion

7.	The gravitational potential due to a mass distribution is V=A√x2+a2. The gravitational field due to the mass distribution is
Answer» The gravitational potential due to a mass distribution is $V = \frac{A}{\sqrt{x^{2} + a^{2}}}$ . The gravitational field due to the mass distribution is

Discussion

8.	In an EM wave the frequency of electric field is :
Answer» In an EM wave the frequency of electric field is :

Discussion

9.	A uniform ring of mass M and radius R is placed directly above a uniform sphere of mass 8 M and of same radius R. The centre of the ring is at a distance of d=√3Rfrom the centre of the sphere. The gravitational attraction between the sphere and the ring is
Answer» A uniform ring of mass M and radius R is placed directly above a uniform sphere of mass 8 M and of same radius R. The centre of the ring is at a distance of $d = \sqrt{3} R$ from the centre of the sphere. The gravitational attraction between the sphere and the ring is

Discussion

10.	A mass of 2000 kg is currently being lowered at a velocity 2 m/s from the drum as shown in the figure. The mass moment of inertia of the drum is 150kg−m2. On applying the brake, the mass is brought to rest in a distance of 0.5 m. The energy absorbed by the brake (in kJ) is
Answer» A mass of 2000 kg is currently being lowered at a velocity 2 m/s from the drum as shown in the figure. The mass moment of inertia of the drum is $150 k g - m^{2}$ . On applying the brake, the mass is brought to rest in a distance of 0.5 m. The energy absorbed by the brake (in kJ) is

Discussion

11.	Which of these light sources will have a cylindrical wave front?
Answer» Which of these light sources will have a cylindrical wave front?

Discussion

12.	A straight rod of length L extends from x = 0 to x = L. The linear mass density of the rod varies with x co-ordinate is λ = a_0 + b_0x^2. The gravitational force experienced by a point mass m at x =-a, is
Answer» A straight rod of length L extends from x = 0 to x = L. The linear mass density of the rod varies with x co-ordinate is λ = a_0 + b_0x^2. The gravitational force experienced by a point mass m at x =-a, is

Discussion

13.	16. The velocity v of a particle at time t is given bywhere a, b and c are constantsThe dimensions of a, b and c are respectivelyAIPMT (Prelims)-2006\rbrack(1) \lbrack LT-2\rbrack, \lbrack L\rbrack and \lbrack T\rbrack(2) \lbrack L1, IT\rbrack and \lbrack LT)(3) \lbrack LT\rbrack, \lbrack LT\rbrack and \lbrack L\rbrack(4) \lbrack L\rbrack, \lbrack LT\rbrack and \lbrack T\rbrack
Answer» 16. The velocity v of a particle at time t is given bywhere a, b and c are constantsThe dimensions of a, b and c are respectivelyAIPMT (Prelims)-2006\rbrack(1) \lbrack LT-2\rbrack, \lbrack L\rbrack and \lbrack T\rbrack(2) \lbrack L1, IT\rbrack and \lbrack LT)(3) \lbrack LT\rbrack, \lbrack LT\rbrack and \lbrack L\rbrack(4) \lbrack L\rbrack, \lbrack LT\rbrack and \lbrack T\rbrack

Discussion

14.	In the figure given below, with what acceleration (in m/s2) does the block of mass 2m move?(Pulley and strings are massless and frictionless)
Answer» In the figure given below, with what acceleration (in ${m/s}^{2}$ ) does the block of mass $2 m$ move? (Pulley and strings are massless and frictionless)

Discussion

15.	A wide vessel of uniform cross-section with a small hole at the bottom is filled with a 40 cm thick layer of water and 30 cm thick layer of kerosene. The relative density of kerosene is 0.8. The initial velocity of flow of the water streaming out of the hole is -
Answer» A wide vessel of uniform cross-section with a small hole at the bottom is filled with a $40 cm$ thick layer of water and $30 cm$ thick layer of kerosene. The relative density of kerosene is $0.8$ . The initial velocity of flow of the water streaming out of the hole is -

Discussion

16.	The electric potential due to dipole at a general point which is at distance r from center of the dipole is
Answer» The electric potential due to dipole at a general point which is at distance $r$ from center of the dipole is

Discussion

17.	time requied to reduce 2 mol of al^{+3} to al with 1 A current i
Answer» time requied to reduce 2 mol of al^{+3} to al with 1 A current i

Discussion

18.	The time taken by a body to slide down a rough 30∘ inclined plane is twice of that required to slide down a smooth 30∘ inclined plane. The coefficient of kinetic friction between the object and the rough plane is given by
Answer» The time taken by a body to slide down a rough $30^{\circ}$ inclined plane is twice of that required to slide down a smooth $30^{\circ}$ inclined plane. The coefficient of kinetic friction between the object and the rough plane is given by

Discussion

19.	A town has an existing horizontal flow sedimentation tank with an overflow rate of 17 m3/day/m2, and it is desirable to remove particles that have a settling velocity of 0.1 mm/sec. Assuming the tank as an ideal sedimentation tank, the percentage of particles removal is approximately equal to
Answer» A town has an existing horizontal flow sedimentation tank with an overflow rate of $17 m^{3} / d a y / m^{2}$ , and it is desirable to remove particles that have a settling velocity of $0.1 m m / s e c$ . Assuming the tank as an ideal sedimentation tank, the percentage of particles removal is approximately equal to

Discussion

20.	A rod with a linear charge density of 3.5 C/m is 2.5 m long. What is the charge on it?
Answer» A rod with a linear charge density of 3.5 C/m is 2.5 m long. What is the charge on it?

Discussion

21.	9.If the electric Field intensity in a fair weather atmosphere is 100V/m , then the total charge on the earth's surface is (radius of the earth is 6400 km )
Answer» 9.If the electric Field intensity in a fair weather atmosphere is 100V/m , then the total charge on the earth's surface is (radius of the earth is 6400 km )

Discussion

22.	Find the resistance between a and b in the circuit given below:
Answer» Find the resistance between a and b in the circuit given below:

22.

Find the resistance between a and b in the circuit given below:

Answer»

Find the resistance between a and b in the circuit given below:

Discussion

23.	a bus is moving with a con†an t vrlocity of 60km/hr calculate the dis†an ce travelled by the bus in 15 second and next 20 second
Answer» a bus is moving with a con†an t vrlocity of 60km/hr calculate the dis†an ce travelled by the bus in 15 second and next 20 second

Discussion

24.	A point charge Q is moving in a circular orbit of radius R in the x-y plane with an angular velocity ω. This can be considered as equivalent to a loop carrying a steady current Qω2π. A uniform magnetic field along the positive z-axis is now switched on, which increases at a constant rate from 0 to B in one second. Assume that the radius of the orbit remains constant. The applications of the magnetic field induces an emf in the orbit. The induced emf is defined as the work done by an induced electric field in moving a unit positive charge around a closed loop. It is known that, for an orbiting charge, the magnetic dipole moment is proportional to the angular momentum with a proportionality constant γ. The change in the magnetic dipole moment associated with the orbit, at the end of the time interval of the magnetic field change
Answer» A point charge Q is moving in a circular orbit of radius R in the x-y plane with an angular velocity $ω$ . This can be considered as equivalent to a loop carrying a steady current $\frac{Q ω}{2 π}$ . A uniform magnetic field along the positive z-axis is now switched on, which increases at a constant rate from 0 to B in one second. Assume that the radius of the orbit remains constant. The applications of the magnetic field induces an emf in the orbit. The induced emf is defined as the work done by an induced electric field in moving a unit positive charge around a closed loop. It is known that, for an orbiting charge, the magnetic dipole moment is proportional to the angular momentum with a proportionality constant $γ$ . The change in the magnetic dipole moment associated with the orbit, at the end of the time interval of the magnetic field change

24.

A point charge Q is moving in a circular orbit of radius R in the x-y plane with an angular velocity ω. This can be considered as equivalent to a loop carrying a steady current Qω2π. A uniform magnetic field along the positive z-axis is now switched on, which increases at a constant rate from 0 to B in one second. Assume that the radius of the orbit remains constant. The applications of the magnetic field induces an emf in the orbit. The induced emf is defined as the work done by an induced electric field in moving a unit positive charge around a closed loop. It is known that, for an orbiting charge, the magnetic dipole moment is proportional to the angular momentum with a proportionality constant γ. The change in the magnetic dipole moment associated with the orbit, at the end of the time interval of the magnetic field change

Answer»

A point charge Q is moving in a circular orbit of radius R in the x-y plane with an angular velocity $ω$ . This can be considered as equivalent to a loop carrying a steady current $\frac{Q ω}{2 π}$ . A uniform magnetic field along the positive z-axis is now switched on, which increases at a constant rate from 0 to B in one second. Assume that the radius of the orbit remains constant. The applications of the magnetic field induces an emf in the orbit. The induced emf is defined as the work done by an induced electric field in moving a unit positive charge around a closed loop. It is known that, for an orbiting charge, the magnetic dipole moment is proportional to the angular momentum with a proportionality constant $γ$ .

The change in the magnetic dipole moment associated with the orbit, at the end of the time interval of the magnetic field change

Discussion

25.	The frequency of a whistle of an engine is 600 cycles/sec is moving with the speed of 30 m/sec towards an observer. The apparent frequency will be (velocity of sound = 330 m/s)
Answer» The frequency of a whistle of an engine is 600 cycles/sec is moving with the speed of 30 m/sec towards an observer. The apparent frequency will be (velocity of sound = 330 m/s)

Discussion

26.	59. Moment of inertia of thin circular Ring about an axis tangent to it and perpendicular to its plane is
Answer» 59. Moment of inertia of thin circular Ring about an axis tangent to it and perpendicular to its plane is

Discussion

27.	If the work done by a body on application of a constant force is directly proportional to the distance travelled by the body, express this in the form of an equation in two variables and draw the graph of the same by taking the constant force as 5 units. Also, read from the graph the work done when the distance travelled by the body is: (i) 2 units (ii) 0 unit
Answer» If the work done by a body on application of a constant force is directly proportional to the distance travelled by the body, express this in the form of an equation in two variables and draw the graph of the same by taking the constant force as 5 units. Also, read from the graph the work done when the distance travelled by the body is: (i) 2 units (ii) 0 unit

Discussion

28.	14 g of nitrogen gas and 7 g of hydrogen gas is present in a clossed vessel at 27C. if the volume of the container is 8.2 L then the pressure of the gas mixture is A. 6 atm B. 12 atm C. 8 atm D. 10 atm
Answer» 14 g of nitrogen gas and 7 g of hydrogen gas is present in a clossed vessel at 27C. if the volume of the container is 8.2 L then the pressure of the gas mixture is A. 6 atm B. 12 atm C. 8 atm D. 10 atm

Discussion

29.	Atom consist of protons, so they repel each other, if yes so why nucleus is so stable.
Answer» Atom consist of protons, so they repel each other, if yes so why nucleus is so stable.

Discussion

30.	49 What is the work done by 0.2 mole of a gas at room temperature to double its volume during isobaric process ?
Answer» 49 What is the work done by 0.2 mole of a gas at room temperature to double its volume during isobaric process ?

Discussion

31.	Use Lenz’s law to determine the direction of induced current in the situations described by Fig. 6.19: (a) A wire of irregular shape turning into a circular shape; (b) A circular loop being deformed into a narrow straight wire.
Answer» Use Lenz’s law to determine the direction of induced current in the situations described by Fig. 6.19: (a) A wire of irregular shape turning into a circular shape; (b) A circular loop being deformed into a narrow straight wire.

Discussion

32.	The plots for intensity versus wavelength for three black bodies at temperatures T1, T2, T3 respectively are shown in figure. Their temperatures are such that
Answer» The plots for intensity versus wavelength for three black bodies at temperatures $T_{1}, T_{2}, T_{3}$ respectively are shown in figure. Their temperatures are such that

Discussion

33.	Particle performing SHM with amplitude A. Its speed is tripled at the ins†an t when it is at a dis†an ce 2A/3 from equilibrium position.New amplitude =
Answer» Particle performing SHM with amplitude A. Its speed is tripled at the ins†an t when it is at a dis†an ce 2A/3 from equilibrium position.New amplitude =

Discussion

34.	A tuning fork of frequency 256 Hz produces 4 beats per second with a wire of length 25 cm vibrating in its fundamental mode. The beat frequency decreases when the length is slightly shortened. What could be the minimum length by which the wire be shortened so that it produces no beats with the tuning fork ?
Answer» A tuning fork of frequency 256 Hz produces 4 beats per second with a wire of length 25 cm vibrating in its fundamental mode. The beat frequency decreases when the length is slightly shortened. What could be the minimum length by which the wire be shortened so that it produces no beats with the tuning fork ?

Discussion

35.	The molar ionic conductance at infinite dilution of Mg2+ and Cl− ions are 106.1 and 76.3 S cm2 mol−1 respectively. The molar conductance of a solution of MgCl2 at infinite dilution is:
Answer» The molar ionic conductance at infinite dilution of $M g^{2 +}$ and $C l^{-}$ ions are $106.1$ and $76.3 {S cm}^{2} {mol}^{- 1}$ respectively. The molar conductance of a solution of $M g C l_{2}$ at infinite dilution is:

Discussion

36.	A uniform square sheet has a side length of 2R. A circular plate of radius (R2) is cut off from the square sheet as shown in the figure. Find the center of mass of the remaining portion when R=8 cm.
Answer» A uniform square sheet has a side length of $2 R$ . A circular plate of radius $(\frac{R}{2})$ is cut off from the square sheet as shown in the figure. Find the center of mass of the remaining portion when $R = 8 cm$ .

Discussion

37.	Answer the following questions: (a) A steady current flows in a metallic conductor of non-uniformcross-section. Which of these quantities is constant along theconductor: current, current density, electric field, drift speed? (b) Is Ohm’s law universally applicable for all conducting elements?If not, give examples of elements which do not obey Ohm’s law. (c) A low voltage supply from which one needs high currents musthave very low internal resistance. Why? (d) A high tension (HT) supply of, say, 6 kV must have a very largeinternal resistance. Why?
Answer» Answer the following questions: (a) A steady current flows in a metallic conductor of non-uniformcross-section. Which of these quantities is constant along theconductor: current, current density, electric field, drift speed? (b) Is Ohm’s law universally applicable for all conducting elements?If not, give examples of elements which do not obey Ohm’s law. (c) A low voltage supply from which one needs high currents musthave very low internal resistance. Why? (d) A high tension (HT) supply of, say, 6 kV must have a very largeinternal resistance. Why?

Discussion

38.	Calculate the field of view of a point object placed symmetrically at a distance 's' from a plane mirror of length 'l', (consider only the region between the mirror and a line parallel to the mirror at distance 's').
Answer» Calculate the field of view of a point object placed symmetrically at a distance 's' from a plane mirror of length 'l', (consider only the region between the mirror and a line parallel to the mirror at distance 's').

Discussion

39.	Taking the radius of the earth as 6400 km and the horizontal component of the earth's magnetic field at the equator as 0.4×10−4 Wb/m2, the minimum momentum of a proton circling the earth at the equator is x×10−17 kg-m/s. The value of x is ______.[ Round off to the nearest integer ]
Answer» Taking the radius of the earth as $6400 km$ and the horizontal component of the earth's magnetic field at the equator as $0.4 \times 10^{- 4} {Wb/m}^{2}$ , the minimum momentum of a proton circling the earth at the equator is $x \times 10^{- 17} kg-m/s$ . The value of $x$ is ______. $[$ Round off to the nearest integer $]$

Discussion

40.	The equivalent stiffness of the system as shown in the figure below is
Answer» The equivalent stiffness of the system as shown in the figure below is

Discussion

41.	A number of capacitors each of capacitance 1 μF and each one of which gets damaged if the potential difference just exceeding 500 V is applied. Then an arrangement suitable for giving a capacitor of capacitance 3 μF across which 2000 V may be applied, requires at least _____ capacitors. (Give integer value)
Answer» A number of capacitors each of capacitance $1 μ F$ and each one of which gets damaged if the potential difference just exceeding $500 V$ is applied. Then an arrangement suitable for giving a capacitor of capacitance $3 μ F$ across which $2000 V$ may be applied, requires at least _____ capacitors. (Give integer value)

Discussion

42.

A musical instrument is made using four different metal strings. 1,2,3 and 4 with mass per unit length μ,2μ,3μ and 4μ respectively. The instrument is played by vibrating the strings by varying the free length in between the range L0 and 2L0 . It is found that in string- 1 ( μ) at free length L0 and tension T0 the fundamental mode frequency is f0. List-I gives the above four strings while List-II lists the magnitude of some quantity. List-I List-II(i)String-1(μ)(P)1(ii)String-2(2μ)(Q)1/2(iii)String- 3(3μ)(R)1/√2(iv)String-4(4μ)(S)1/√3 (T)3/16 (U)1/16If the tension in each string is T0, the correct match for the highest fundamental frequency in f0 units will be,

Answer»

A musical instrument is made using four different metal strings. $1, 2, 3$ and 4 with mass per unit length $μ, 2 μ, 3 μ$ and $4 μ$ respectively. The instrument is played by vibrating the strings by varying the free length in between the range $L_{0} and 2 L_{0} . It is found that in string- 1 (μ)$ at free length $L_{0}$ and tension $T_{0}$ the fundamental mode frequency is $f_{0} .$ List-I gives the above four strings while List-II lists the magnitude of some quantity.

	List-I		List-II
(i)	String-1 $(μ)$	(P)	$1$
(ii)	String-2 $(2 μ)$	(Q)	$1 / 2$
(iii)	String- 3 $(3 μ)$	(R)	$1 / \sqrt{2}$
(iv)	String-4 $(4 μ)$	(S)	$1 / \sqrt{3}$
		(T)	$3 / 16$
		(U)	$1 / 16$

If the tension in each string is $T_{0}$ , the correct match for the highest fundamental frequency in $f_{0}$ units will be,

Discussion

43.	A small soap bubble of radius 4 cm is trapped inside another bubble of radius6 cm without any contact. Let P2 be thepressure inside the inner bubble and P be the pressure outside the outer bubble .Then Radius of another bubble with pressure difference P2-P between its inside andoutside would be:
Answer» A small soap bubble of radius 4 cm is trapped inside another bubble of radius6 cm without any contact. Let P2 be thepressure inside the inner bubble and P be the pressure outside the outer bubble .Then Radius of another bubble with pressure difference P2-P between its inside andoutside would be:

Discussion

44.	53. A Curved Road with radius of curvature 200 metre is Banked with a n and angle of bending equals to tan inverse( 0.2) now if the traffic is at double the speed for which road is designed the minimum value of the frictional Coefficient needed is
Answer» 53. A Curved Road with radius of curvature 200 metre is Banked with a n and angle of bending equals to tan inverse( 0.2) now if the traffic is at double the speed for which road is designed the minimum value of the frictional Coefficient needed is

Discussion

45.	In YDSE, the thickness of a glass slab (μ=1.5) which should be placed in front of the upper slit S1 so that the central maximum now lies at a point where the 5th bright fringe was lying earlier (before inserting the slab), is given by x×104 ˙A. The value of x is (Integer only)[Wavelength of light =5000 ˙A]
Answer» In $Y D S E$ , the thickness of a glass slab $(μ = 1.5)$ which should be placed in front of the upper slit $S_{1}$ so that the central maximum now lies at a point where the $5^{t h}$ bright fringe was lying earlier (before inserting the slab), is given by $x \times 10^{4} ˙ A$ . The value of $x$ is (Integer only) [Wavelength of light $= 5000 ˙ A$ ]

Discussion

46.	Two pinholes 1.5 mm apart are placed in front of a source of light of wavelength 5.5×10−5 cm and seen through a telescope with its objectives stopped down to a diameter of 0.4 cm. Find the maximum distance from the telescope at which the pinholes can be resolved.
Answer» Two pinholes $1.5 mm$ apart are placed in front of a source of light of wavelength $5.5 \times 10^{- 5} cm$ and seen through a telescope with its objectives stopped down to a diameter of $0.4 cm .$ Find the maximum distance from the telescope at which the pinholes can be resolved.

Discussion

47.	A coordinate axis as shown below is kept infront of a converging lens at a distance 2f from it where f is the focal length of the lens, what is the approximate shapeof the image as seen by an observer on the other side of the lens at a distance 3f from it. Assume that x−axis is along the principle axis of the lens
Answer» A coordinate axis as shown below is kept infront of a converging lens at a distance $2 f$ from it where $f$ is the focal length of the lens, what is the approximate shapeof the image as seen by an observer on the other side of the lens at a distance $3 f$ from it. Assume that $x - axis$ is along the principle axis of the lens

Discussion

48.	A semi circular ring of radius 2π is situated in X−Y plane having centre at (10,10) as shown in the figure below. Find the co-ordinates of centre of mass of the ring.
Answer» A semi circular ring of radius $2 π$ is situated in $X - Y$ plane having centre at $(10, 10)$ as shown in the figure below. Find the co-ordinates of centre of mass of the ring.

Discussion

49.	what happens if a lens is made up of two different materials ??
Answer» what happens if a lens is made up of two different materials ??

Discussion

50.

A force F is applied to the initially stationary cart. The variation of force with time is shown in the figure. The speed of cart at t = 5 sec is

Answer»

A force F is applied to the initially stationary cart. The variation of force with time is shown in the figure. The speed of cart at t = 5 sec is

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The graph between √Ek and 1P is(Ek = kinetic energy and P= linear momentum)

what is the difference between incident light and incident radiation

A streamer moves with velocity 3km/h against the direction of river water whose velocity is 2 km/h. The total time taken for the journey if the boat travel 3 km in direction of the stream and then back to its place is?

What is happening to the velocity of the ball vertically projected up throughout its journey?

The value of ∫cotx√5+9cot2xdx is equal to(where C is constant of integration)

The values of L and R in LCR circuit are 1 mH and 10 Ω respectively. What is the value of its bandwidth?

The gravitational potential due to a mass distribution is V=A√x2+a2. The gravitational field due to the mass distribution is

In an EM wave the frequency of electric field is :

A uniform ring of mass M and radius R is placed directly above a uniform sphere of mass 8 M and of same radius R. The centre of the ring is at a distance of d=√3Rfrom the centre of the sphere. The gravitational attraction between the sphere and the ring is

A mass of 2000 kg is currently being lowered at a velocity 2 m/s from the drum as shown in the figure. The mass moment of inertia of the drum is 150kg−m2. On applying the brake, the mass is brought to rest in a distance of 0.5 m. The energy absorbed by the brake (in kJ) is

Which of these light sources will have a cylindrical wave front?

A straight rod of length L extends from x = 0 to x = L. The linear mass density of the rod varies with x co-ordinate is λ = a_0 + b_0x^2. The gravitational force experienced by a point mass m at x =-a, is

In the figure given below, with what acceleration (in m/s2) does the block of mass 2m move?(Pulley and strings are massless and frictionless)

A wide vessel of uniform cross-section with a small hole at the bottom is filled with a 40 cm thick layer of water and 30 cm thick layer of kerosene. The relative density of kerosene is 0.8. The initial velocity of flow of the water streaming out of the hole is -

The electric potential due to dipole at a general point which is at distance r from center of the dipole is

time requied to reduce 2 mol of al^{+3} to al with 1 A current i

The time taken by a body to slide down a rough 30∘ inclined plane is twice of that required to slide down a smooth 30∘ inclined plane. The coefficient of kinetic friction between the object and the rough plane is given by

A town has an existing horizontal flow sedimentation tank with an overflow rate of 17 m3/day/m2, and it is desirable to remove particles that have a settling velocity of 0.1 mm/sec. Assuming the tank as an ideal sedimentation tank, the percentage of particles removal is approximately equal to

A rod with a linear charge density of 3.5 C/m is 2.5 m long. What is the charge on it?

9.If the electric Field intensity in a fair weather atmosphere is 100V/m , then the total charge on the earth's surface is (radius of the earth is 6400 km )

Find the resistance between a and b in the circuit given below:

a bus is moving with a con†an t vrlocity of 60km/hr calculate the dis†an ce travelled by the bus in 15 second and next 20 second

The frequency of a whistle of an engine is 600 cycles/sec is moving with the speed of 30 m/sec towards an observer. The apparent frequency will be (velocity of sound = 330 m/s)

59. Moment of inertia of thin circular Ring about an axis tangent to it and perpendicular to its plane is

14 g of nitrogen gas and 7 g of hydrogen gas is present in a clossed vessel at 27C. if the volume of the container is 8.2 L then the pressure of the gas mixture is A. 6 atm B. 12 atm C. 8 atm D. 10 atm

Atom consist of protons, so they repel each other, if yes so why nucleus is so stable.

49 What is the work done by 0.2 mole of a gas at room temperature to double its volume during isobaric process ?

Use Lenz’s law to determine the direction of induced current in the situations described by Fig. 6.19: (a) A wire of irregular shape turning into a circular shape; (b) A circular loop being deformed into a narrow straight wire.

The plots for intensity versus wavelength for three black bodies at temperatures T1, T2, T3 respectively are shown in figure. Their temperatures are such that

Particle performing SHM with amplitude A. Its speed is tripled at the ins†an t when it is at a dis†an ce 2A/3 from equilibrium position.New amplitude =

The molar ionic conductance at infinite dilution of Mg2+ and Cl− ions are 106.1 and 76.3 S cm2 mol−1 respectively. The molar conductance of a solution of MgCl2 at infinite dilution is:

A uniform square sheet has a side length of 2R. A circular plate of radius (R2) is cut off from the square sheet as shown in the figure. Find the center of mass of the remaining portion when R=8 cm.

Calculate the field of view of a point object placed symmetrically at a distance 's' from a plane mirror of length 'l', (consider only the region between the mirror and a line parallel to the mirror at distance 's').

Taking the radius of the earth as 6400 km and the horizontal component of the earth's magnetic field at the equator as 0.4×10−4 Wb/m2, the minimum momentum of a proton circling the earth at the equator is x×10−17 kg-m/s. The value of x is ______.[ Round off to the nearest integer ]

The equivalent stiffness of the system as shown in the figure below is

A small soap bubble of radius 4 cm is trapped inside another bubble of radius6 cm without any contact. Let P2 be thepressure inside the inner bubble and P be the pressure outside the outer bubble .Then Radius of another bubble with pressure difference P2-P between its inside andoutside would be:

53. A Curved Road with radius of curvature 200 metre is Banked with a n and angle of bending equals to tan inverse( 0.2) now if the traffic is at double the speed for which road is designed the minimum value of the frictional Coefficient needed is

Two pinholes 1.5 mm apart are placed in front of a source of light of wavelength 5.5×10−5 cm and seen through a telescope with its objectives stopped down to a diameter of 0.4 cm. Find the maximum distance from the telescope at which the pinholes can be resolved.

A semi circular ring of radius 2π is situated in X−Y plane having centre at (10,10) as shown in the figure below. Find the co-ordinates of centre of mass of the ring.

what happens if a lens is made up of two different materials ??

A force F is applied to the initially stationary cart. The variation of force with time is shown in the figure. The speed of cart at t = 5 sec is