50278 + Interview Questions in Physics

1.	a wire 2m in length suspended vertically stretches by 10mm when a mass of 10kg is attached to its lower end . the elastic potential gain by the wire is
Answer» a wire 2m in length suspended vertically stretches by 10mm when a mass of 10kg is attached to its lower end . the elastic potential gain by the wire is

Discussion

2.	Figure8.6 shows a capacitor made of two circular plates each of radius 12cm, and separated by 5.0 cm. The capacitor is being charged by anexternal source (not shown in the figure). The charging current isconstant and equal to 0.15 A.(a) Calculatethe capacitance and the rate of charge of potential differencebetween the plates.(b) Obtainthe displacement current across the plates.(c) IsKirchhoff’s first rule (junction rule) valid at each plate ofthe capacitor? Explain.
Answer» Figure 8.6 shows a capacitor made of two circular plates each of radius 12 cm, and separated by 5.0 cm. The capacitor is being charged by an external source (not shown in the figure). The charging current is constant and equal to 0.15 A. (a) Calculate the capacitance and the rate of charge of potential difference between the plates. (b) Obtain the displacement current across the plates. (c) Is Kirchhoff’s first rule (junction rule) valid at each plate of the capacitor? Explain.

2.

Figure8.6 shows a capacitor made of two circular plates each of radius 12cm, and separated by 5.0 cm. The capacitor is being charged by anexternal source (not shown in the figure). The charging current isconstant and equal to 0.15 A.(a) Calculatethe capacitance and the rate of charge of potential differencebetween the plates.(b) Obtainthe displacement current across the plates.(c) IsKirchhoff’s first rule (junction rule) valid at each plate ofthe capacitor? Explain.

Answer»

Figure
8.6 shows a capacitor made of two circular plates each of radius 12
cm, and separated by 5.0 cm. The capacitor is being charged by an
external source (not shown in the figure). The charging current is
constant and equal to 0.15 A.

(a) Calculate
the capacitance and the rate of charge of potential difference
between the plates.

(b) Obtain
the displacement current across the plates.

(c) Is
Kirchhoff’s first rule (junction rule) valid at each plate of
the capacitor? Explain.

Discussion

3.	Two men A and B are s†an ding at corners P and Q of square PQRS of side 8m. They start moving along the track with cons†an t speed 2m/s and 10 m/s respectively. The time when they meet for the first time is equal to (1) 1 s (2) 3 s (3) 6 s (4) 2 s
Answer» Two men A and B are s†an ding at corners P and Q of square PQRS of side 8m. They start moving along the track with cons†an t speed 2m/s and 10 m/s respectively. The time when they meet for the first time is equal to (1) 1 s (2) 3 s (3) 6 s (4) 2 s

Discussion

4.	The resistance R=V/I, Where V=(100+-5) and I=(10-+0.2)A. Find the %age error in R.
Answer» The resistance R=V/I, Where V=(100+-5) and I=(10-+0.2)A. Find the %age error in R.

Discussion

5.	In an ac circuit the current and voltage are given by I is equal to 5 cos ω t and v is equal to 200 sint respectively power loss in the circuit is
Answer» In an ac circuit the current and voltage are given by I is equal to 5 cos ω t and v is equal to 200 sint respectively power loss in the circuit is

Discussion

6.	Two point masses m and 2m are initially kept at distance 3x0. Now they are released and move only under their mutual gravitational interaction force. They collide after time t0. Average speed of particle of mass 2m during this time is √αGmβπ2X0. Find minimum value of β−α, where β and α are whole number. (Answer upto two digit after decimal places)
Answer» Two point masses m and 2m are initially kept at distance $3 x_{0}$ . Now they are released and move only under their mutual gravitational interaction force. They collide after time $t_{0}$ . Average speed of particle of mass 2m during this time is $\sqrt{\frac{α G m}{β π^{2} X_{0}}}$ . Find minimum value of $β - α$ , where $β$ and $α$ are whole number. (Answer upto two digit after decimal places)

Discussion

7.	Find the magnetic dipole moment of a revolving electron.
Answer» Find the magnetic dipole moment of a revolving electron.

Discussion

8.	Three concentric metal shells A,B and C of respective radii a,b and c (a<b<c) have surface charge densities +σ,−σ and +σ respectively. The potential of shell B is
Answer» Three concentric metal shells $A, B$ and $C$ of respective radii $a, b$ and $c (a < b < c)$ have surface charge densities $+ σ, - σ$ and $+ σ$ respectively. The potential of shell $B$ is

Discussion

9.	A 2.27L cylindee is found to develooed a leakage when the leakage plugges the pressure had dropped to 570mmhg .calculate the no.of moles of gas that has escape
Answer» A 2.27L cylindee is found to develooed a leakage when the leakage plugges the pressure had dropped to 570mmhg .calculate the no.of moles of gas that has escape

Discussion

10.	a block of mass m placed on an inclined plane of angle of inclination 'theta' slides down the plane with constant speed. the coefficient of kinetic friction between block and inclined plane isa) sin thetab) cos thetac) tan thetad) cot theta
Answer» a block of mass m placed on an inclined plane of angle of inclination 'theta' slides down the plane with constant speed. the coefficient of kinetic friction between block and inclined plane is a) sin theta b) cos theta c) tan theta d) cot theta

Discussion

11.	The potential energy for a force field →F is given by U(x,y)=sin(x+y). The force acting on the particle of mass m at (0,π4) is (in N)
Answer» The potential energy for a force field $\to F$ is given by $U (x, y) = sin (x + y)$ . The force acting on the particle of mass $m$ at $(0, \frac{π}{4})$ is (in $N$ )

Discussion

12.	if momentumof an objectis increased by 10% then its kinetic energy will increase by?
Answer» if momentumof an objectis increased by 10% then its kinetic energy will increase by?

Discussion

13.	An astronaut is looking down on earth’s surface from a space shuttle at an altitude of 400 km. Assuming that the astronaut’s pupil diameter is 5 mm and the wavelength of visible light is 500 nm, the astronaut will be able to resolve linear objects of the size of about
Answer» An astronaut is looking down on earth’s surface from a space shuttle at an altitude of 400 km. Assuming that the astronaut’s pupil diameter is 5 mm and the wavelength of visible light is 500 nm, the astronaut will be able to resolve linear objects of the size of about

Discussion

14.	An electric dipole of dipole moment p is placed in the position of stable equilibrium in uniform electric field of intensity E. This is rotated through an angle theta from the initial position the potential energy of the electric dipole in the final position is
Answer» An electric dipole of dipole moment p is placed in the position of stable equilibrium in uniform electric field of intensity E. This is rotated through an angle theta from the initial position the potential energy of the electric dipole in the final position is

Discussion

15.	The volume occupied by 4.75 g of acetylene gas at 50∘ C and 740 mm Hg pressure is ____L.(Rounded off to the nearest integer)][Given R=0.0826 L atm K−1 mol−1
Answer» The volume occupied by $4.75 g$ of acetylene gas at $50^{\circ} C$ and $740 m m H g$ pressure is ____L. (Rounded off to the nearest integer)] [Given $R = 0.0826 L a t m K^{- 1} m o l^{- 1}$

Discussion

16.	A nucleus AZX going through a β+ decay will end up taking what configuration?
Answer» A nucleus $_{Z}^{A} X$ going through a $β^{+}$ decay will end up taking what configuration?

Discussion

17.	A 2kg block is moving on positive X-axis. A time dependent force of F=(-t+4) acts on it for 6sec. Find it's K.E?
Answer» A 2kg block is moving on positive X-axis. A time dependent force of F=(-t+4) acts on it for 6sec. Find it's K.E?

Discussion

18.	A steel scale measures the length of a copper rod as L cm when both are at 20∘C, the calibration temperature for the scale. If the coefficients of linear expansion for steel and copper are αs and αc respectively, what would be the scale reading (in cm) when both are at 21∘C?
Answer» A steel scale measures the length of a copper rod as $L cm$ when both are at $20^{\circ} C$ , the calibration temperature for the scale. If the coefficients of linear expansion for steel and copper are $α_{s}$ and $α_{c}$ respectively, what would be the scale reading (in cm) when both are at $21^{\circ} C$ ?

Discussion

19.	The distance travelled by a body falling freely from rest in 2nd,3rd and 5th second of it motion are in the ratio of
Answer» The distance travelled by a body falling freely from rest in $2^{nd}, 3^{rd}$ and $5^{th}$ second of it motion are in the ratio of

Discussion

20.	Define vector analysis?
Answer» Define vector analysis?

Discussion

21.	Kinetic energy with which the electrons are emitted from the metal surface due to Photoelectric effect is 1) independent of the intensity of illumination 2) independent of the frequency of light 3) inversely proportional to the intensity of illumination 4) directly proportional to the intensity of illumination
Answer» Kinetic energy with which the electrons are emitted from the metal surface due to Photoelectric effect is 1) independent of the intensity of illumination 2) independent of the frequency of light 3) inversely proportional to the intensity of illumination 4) directly proportional to the intensity of illumination

21.

Kinetic energy with which the electrons are emitted from the metal surface due to Photoelectric effect is 1) independent of the intensity of illumination 2) independent of the frequency of light 3) inversely proportional to the intensity of illumination 4) directly proportional to the intensity of illumination

Answer»

Kinetic energy with which the electrons are emitted from the metal surface due to Photoelectric effect is

1) independent of the intensity of illumination

2) independent of the frequency of light

3) inversely proportional to the intensity of illumination

4) directly proportional to the intensity of illumination

Discussion

22.	A conducting sphere of radius R carrying charge Q lies in side an uncharged conducting shell of radius 2R , if they are joined by a metal wire ,vthe amount of heat produced is.
Answer» A conducting sphere of radius R carrying charge Q lies in side an uncharged conducting shell of radius 2R , if they are joined by a metal wire ,vthe amount of heat produced is.

Discussion

23.	a ball is projected vertically upwards from ground with velocity 12m/s in the presence of air drag whose magnitudevalways remains cons†an t .if ball takes one second to the highest point in presenceof air friction then calculate the difference of time of flight of ball in presence of and in absence of air friction
Answer» a ball is projected vertically upwards from ground with velocity 12m/s in the presence of air drag whose magnitudevalways remains cons†an t .if ball takes one second to the highest point in presenceof air friction then calculate the difference of time of flight of ball in presence of and in absence of air friction

Discussion

24.	A plano convex lens (f = 20 cm) is silvered at plane surface. Now f will be
Answer» A plano convex lens (f = 20 cm) is silvered at plane surface. Now f will be

Discussion

25.	At NTP, 5.6 Litre of a gas weight 8 gram. The vapour density of gas is a)32 b)40 c)16 d)8
Answer» At NTP, 5.6 Litre of a gas weight 8 gram. The vapour density of gas is a)32 b)40 c)16 d)8

Discussion

26.	Two beads (each of mass m) can move freely in a frictionless wire, whose rotational inertia with respect to the vertical axis is I. The system is rotated with an angular velocity ω0, when the beads are at a distance r/2 from the axis. What is the angular velocity of the system when the beads are at a distance r from the axis?
Answer» Two beads (each of mass $m$ ) can move freely in a frictionless wire, whose rotational inertia with respect to the vertical axis is $I$ . The system is rotated with an angular velocity $ω_{0}$ , when the beads are at a distance $r / 2$ from the axis. What is the angular velocity of the system when the beads are at a distance $r$ from the axis?

Discussion

27.	Light of wavelength 6000 ∘A is incident along the normal on a glass plate of refractive index 1.5. What should be the smallest thickness of the plate which will make it appear darker when reflection is observed ?
Answer» Light of wavelength $6000 \circ A$ is incident along the normal on a glass plate of refractive index 1.5. What should be the smallest thickness of the plate which will make it appear darker when reflection is observed ?

Discussion

28.	An air bubble of volume V0 is released by a fish at a depth h in a lake. The bubble rises to the surface. Assume constant temperature and standard atmospheric pressure P above the lake. The volume of the bubble just before touching the surface will be (density of water is ρ)(Assume that the radius of bubble is neglegible)
Answer» An air bubble of volume $V_{0}$ is released by a fish at a depth $h$ in a lake. The bubble rises to the surface. Assume constant temperature and standard atmospheric pressure $P$ above the lake. The volume of the bubble just before touching the surface will be (density of water is $ρ)$ $($ Assume that the radius of bubble is neglegible $)$

Discussion

29.	Two metallic spheres S1 and S2 of equal densities (ρ) are made of the same material and have got identical surface finish. The mass of S1 is thrice that of S2. Both the spheres are heated to the same high temperature and placed in the same room having lower temperature but are thermally insulated from each other. The ratio of the initial rate of cooling of S1 to that S2 is
Answer» Two metallic spheres $S_{1}$ and $S_{2}$ of equal densities $(ρ)$ are made of the same material and have got identical surface finish. The mass of $S_{1}$ is thrice that of $S_{2}$ . Both the spheres are heated to the same high temperature and placed in the same room having lower temperature but are thermally insulated from each other. The ratio of the initial rate of cooling of $S_{1}$ to that $S_{2}$ is

Discussion

30.	A uniform rod of mass 'm' and length 'l' is kept vertical with the lower end clamped. It is slightly pushed to let it fall down under gravity. Find its angular speed when the rod is passing through its lowest position. Neglect any friction at the clamp. What will be the linear speed of the free end at this instant?
Answer» A uniform rod of mass 'm' and length 'l' is kept vertical with the lower end clamped. It is slightly pushed to let it fall down under gravity. Find its angular speed when the rod is passing through its lowest position. Neglect any friction at the clamp. What will be the linear speed of the free end at this instant?

Discussion

31.	an ideal gas has adiabatic exponent γ it contracts according to the law pv=α,where α is a positive cons†an t. for this process,the bulk modulus of the gas is 1)p 2)p/α 3)α p 4) (1-α)
Answer» an ideal gas has adiabatic exponent γ it contracts according to the law pv=α,where α is a positive cons†an t. for this process,the bulk modulus of the gas is 1)p 2)p/α 3)α p 4) (1-α)

Discussion

32.	The electric field of a plane electromagnetic wave propagating along the x−direction in vacuum is →E=E0^jcos(ωt−kx). The magnetic field →B, at the moment t=0 is:
Answer» The electric field of a plane electromagnetic wave propagating along the $x - direction$ in vacuum is $\to E = E_{0}^j cos (ω t - k x) .$ The magnetic field $\to B,$ at the moment $t = 0$ is:

Discussion

33.	The height of a tower is hmeter. A body is thrown from the tower vertically upward and with some speed. It takes t1 sec to reach the ground. Another body is thrown from the tower with same speed downwards takes t2 sec to reach the ground. If the body is released from the point and takes t sec to reach the ground, obtain the relation for t in terms of t1 and t2
Answer» The height of a tower is hmeter. A body is thrown from the tower vertically upward and with some speed. It takes t1 sec to reach the ground. Another body is thrown from the tower with same speed downwards takes t2 sec to reach the ground. If the body is released from the point and takes t sec to reach the ground, obtain the relation for t in terms of t1 and t2

Discussion

34.	IF the tension in the string in figure (6-E3) is 16 N and the acceleration of each block is 0.5 m/s2, Find the friction coefficients at the two contacts with the block.
Answer» IF the tension in the string in figure (6-E3) is 16 N and the acceleration of each block is 0.5 $m / s^{2}$ , Find the friction coefficients at the two contacts with the block.

Discussion

35.	A long straight wire carrying current of 30 A is placed in an external uniform magnetic field of 4×10−4 T parallel to the current. Find the magnitude of net magnetic field at point 2 cm away from the wire.
Answer» A long straight wire carrying current of $30 A$ is placed in an external uniform magnetic field of $4 \times 10^{- 4} T$ parallel to the current. Find the magnitude of net magnetic field at point $2 cm$ away from the wire.

Discussion

36.	36. How to calculate N-factor from Lewis structure ?
Answer» 36. How to calculate N-factor from Lewis structure ?

Discussion

37.	There is uniformly charged non-conducting solod sphere made of material of dielectric constant 1. If electric potential at infinity be zero, then the potential at it's surface is 'V. If we take electric potential at it's surface to be Zero, then potential at centre will be a. 3V/2 b. V/2 c. V d. zero
Answer» There is uniformly charged non-conducting solod sphere made of material of dielectric constant 1. If electric potential at infinity be zero, then the potential at it's surface is 'V. If we take electric potential at it's surface to be Zero, then potential at centre will be a. 3V/2 b. V/2 c. V d. zero

Discussion

38.	A person moves towards east for 3 m then towards north for 4mand then moves vertically up by 5 metre what is the distance now from the starting point
Answer» A person moves towards east for 3 m then towards north for 4mand then moves vertically up by 5 metre what is the distance now from the starting point

Discussion

39.	The graph shown in the adjacent diagram, represents the variation of temperature (T) of two bodies, x and y having same surface area, with time (t) due to the emission of radiation. Find the correct relation between the emissivity (e) and absorptivity (a) power of the two bodies. (IIT JEE 2003)
Answer» The graph shown in the adjacent diagram, represents the variation of temperature (T) of two bodies, x and y having same surface area, with time (t) due to the emission of radiation. Find the correct relation between the emissivity ( $e$ ) and absorptivity ( $a$ ) power of the two bodies. (IIT JEE 2003)

39.

The graph shown in the adjacent diagram, represents the variation of temperature (T) of two bodies, x and y having same surface area, with time (t) due to the emission of radiation. Find the correct relation between the emissivity (e) and absorptivity (a) power of the two bodies. (IIT JEE 2003)

Answer»

The graph shown in the adjacent diagram, represents the variation of temperature (T) of two bodies, x and y having same surface area, with time (t) due to the emission of radiation. Find the correct relation between the emissivity ( $e$ ) and absorptivity ( $a$ ) power of the two bodies. (IIT JEE 2003)

Discussion

40.	The sum of 436.32,227.2 and 0.301 in appropriate significant figures is
Answer» The sum of $436.32, 227.2$ and $0.301$ in appropriate significant figures is

Discussion

41.	A pendulum bob is swinging in a vertical plane such that its angular amplitude is less than 90∘. If at its extreme position, the string is cut, which of the following trajectory is possible for the bob afterwards?
Answer» A pendulum bob is swinging in a vertical plane such that its angular amplitude is less than $90^{\circ}$ . If at its extreme position, the string is cut, which of the following trajectory is possible for the bob afterwards?

Discussion

42.	what is stokes law and terminal velocity?
Answer» what is stokes law and terminal velocity?

Discussion

43.	an object of mass 2 kg is sliding with a cons†an t velocity of 4 m/s on a rough horizontal table under the action of 4 N horizontal force . if a 10 N force is applied instead of 4 N then the accelaration of the block is
Answer» an object of mass 2 kg is sliding with a cons†an t velocity of 4 m/s on a rough horizontal table under the action of 4 N horizontal force . if a 10 N force is applied instead of 4 N then the accelaration of the block is

Discussion

44.	A brass rod of length 50 cm and diameter 3.0 mm is joined to a steel rod of the same length and diameter. What is the change in length of the combined rod at 250 °C, if the original lengths are at 40.0 °C? Is there a ‘thermal stress’ developed at the junction ? The ends of the rod are free to expand (Co-efficient of linear expansion of brass = 2.0 × 10¯⁵ K¯¹, steel = 1.2 × 10¯⁵K¯¹ ).
Answer» A brass rod of length 50 cm and diameter 3.0 mm is joined to a steel rod of the same length and diameter. What is the change in length of the combined rod at 250 °C, if the original lengths are at 40.0 °C? Is there a ‘thermal stress’ developed at the junction ? The ends of the rod are free to expand (Co-efficient of linear expansion of brass = 2.0 × 10¯⁵ K¯¹, steel = 1.2 × 10¯⁵K¯¹ ).

Discussion

45.	What will be the expression for the angular magnification produced by the telescope?
Answer» What will be the expression for the angular magnification produced by the telescope?

Discussion

46.	An ideal gas is taken from an initial state i to a final state f in such a way that the ratio of the pressure to the absolute temperature remains constant. What will be the work done by the gas ?
Answer» An ideal gas is taken from an initial state i to a final state f in such a way that the ratio of the pressure to the absolute temperature remains constant. What will be the work done by the gas ?

Discussion

47.	A 800 kW, 11 kV, 3-phase star-connected synchronous motor has a synchronous reactance of 35Ω/phase and negligible resistance. The motor is operating on full-load at 0.8 pf leading. The efficiency is 95%. The excitation emf per phase is _______kV.7.668
Answer» A 800 kW, 11 kV, 3-phase star-connected synchronous motor has a synchronous reactance of $35 Ω$ /phase and negligible resistance. The motor is operating on full-load at 0.8 pf leading. The efficiency is 95%. The excitation emf per phase is _______kV. 7.668

Discussion

48.	In a convex lens of focal length F, the minimum distance between an object and it's real image must be? a) 3F b) 4F c) 3/2F d) 2F
Answer» In a convex lens of focal length F, the minimum distance between an object and it's real image must be? a) 3F b) 4F c) 3/2F d) 2F

48.

In a convex lens of focal length F, the minimum distance between an object and it's real image must be? a) 3F b) 4F c) 3/2F d) 2F

Answer»

In a convex lens of focal length F, the minimum distance between an object and it's real image must be?

a) 3F b) 4F c) 3/2F d) 2F

Discussion

49.	A CLOSED CYLINDRICAL TUBE CONTAINS SOME WATER LIES IN AHORIZONTAL PLANE IF TUBE IS ROTATED ABOUT A PERPENDICULAR BISECTOR THE MOMENT OF INERTIA OF WATER ABOUT THE AXIS\lbrack
Answer» A CLOSED CYLINDRICAL TUBE CONTAINS SOME WATER LIES IN AHORIZONTAL PLANE IF TUBE IS ROTATED ABOUT A PERPENDICULAR BISECTOR THE MOMENT OF INERTIA OF WATER ABOUT THE AXIS\lbrack

Discussion

50.	When 100 V dc is supplied across a solenoid, a current of 1.0 A flows in it. When 100 V ac is applied across the same coil, the current drops to 0.5 A. If the frequency of ac source is 50 Hz, then the impedance and inductance of the solenoid are
Answer» When $100 V$ dc is supplied across a solenoid, a current of $1.0 A$ flows in it. When $100 V$ ac is applied across the same coil, the current drops to $0.5 A$ . If the frequency of ac source is $50 H z$ , then the impedance and inductance of the solenoid are

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

a wire 2m in length suspended vertically stretches by 10mm when a mass of 10kg is attached to its lower end . the elastic potential gain by the wire is

Two men A and B are s†an ding at corners P and Q of square PQRS of side 8m. They start moving along the track with cons†an t speed 2m/s and 10 m/s respectively. The time when they meet for the first time is equal to (1) 1 s (2) 3 s (3) 6 s (4) 2 s

The resistance R=V/I, Where V=(100+-5) and I=(10-+0.2)A. Find the %age error in R.

In an ac circuit the current and voltage are given by I is equal to 5 cos ω t and v is equal to 200 sint respectively power loss in the circuit is

Find the magnetic dipole moment of a revolving electron.

Three concentric metal shells A,B and C of respective radii a,b and c (a&lt;b&lt;c) have surface charge densities +σ,−σ and +σ respectively. The potential of shell B is

A 2.27L cylindee is found to develooed a leakage when the leakage plugges the pressure had dropped to 570mmhg .calculate the no.of moles of gas that has escape

a block of mass m placed on an inclined plane of angle of inclination 'theta' slides down the plane with constant speed. the coefficient of kinetic friction between block and inclined plane isa) sin thetab) cos thetac) tan thetad) cot theta

The potential energy for a force field →F is given by U(x,y)=sin(x+y). The force acting on the particle of mass m at (0,π4) is (in N)

if momentumof an objectis increased by 10% then its kinetic energy will increase by?

An astronaut is looking down on earth’s surface from a space shuttle at an altitude of 400 km. Assuming that the astronaut’s pupil diameter is 5 mm and the wavelength of visible light is 500 nm, the astronaut will be able to resolve linear objects of the size of about

An electric dipole of dipole moment p is placed in the position of stable equilibrium in uniform electric field of intensity E. This is rotated through an angle theta from the initial position the potential energy of the electric dipole in the final position is

The volume occupied by 4.75 g of acetylene gas at 50∘ C and 740 mm Hg pressure is ____L.(Rounded off to the nearest integer)][Given R=0.0826 L atm K−1 mol−1

A nucleus AZX going through a β+ decay will end up taking what configuration?

A 2kg block is moving on positive X-axis. A time dependent force of F=(-t+4) acts on it for 6sec. Find it's K.E?

A steel scale measures the length of a copper rod as L cm when both are at 20∘C, the calibration temperature for the scale. If the coefficients of linear expansion for steel and copper are αs and αc respectively, what would be the scale reading (in cm) when both are at 21∘C?

The distance travelled by a body falling freely from rest in 2nd,3rd and 5th second of it motion are in the ratio of

Define vector analysis?

A conducting sphere of radius R carrying charge Q lies in side an uncharged conducting shell of radius 2R , if they are joined by a metal wire ,vthe amount of heat produced is.

A plano convex lens (f = 20 cm) is silvered at plane surface. Now f will be

At NTP, 5.6 Litre of a gas weight 8 gram. The vapour density of gas is a)32 b)40 c)16 d)8

Light of wavelength 6000 ∘A is incident along the normal on a glass plate of refractive index 1.5. What should be the smallest thickness of the plate which will make it appear darker when reflection is observed ?

an ideal gas has adiabatic exponent γ it contracts according to the law pv=α,where α is a positive cons†an t. for this process,the bulk modulus of the gas is 1)p 2)p/α 3)α p 4) (1-α)

The electric field of a plane electromagnetic wave propagating along the x−direction in vacuum is →E=E0^jcos(ωt−kx). The magnetic field →B, at the moment t=0 is:

IF the tension in the string in figure (6-E3) is 16 N and the acceleration of each block is 0.5 m/s2, Find the friction coefficients at the two contacts with the block.

A long straight wire carrying current of 30 A is placed in an external uniform magnetic field of 4×10−4 T parallel to the current. Find the magnitude of net magnetic field at point 2 cm away from the wire.

36. How to calculate N-factor from Lewis structure ?

A person moves towards east for 3 m then towards north for 4mand then moves vertically up by 5 metre what is the distance now from the starting point

The graph shown in the adjacent diagram, represents the variation of temperature (T) of two bodies, x and y having same surface area, with time (t) due to the emission of radiation. Find the correct relation between the emissivity (e) and absorptivity (a) power of the two bodies. (IIT JEE 2003)

The sum of 436.32,227.2 and 0.301 in appropriate significant figures is

A pendulum bob is swinging in a vertical plane such that its angular amplitude is less than 90∘. If at its extreme position, the string is cut, which of the following trajectory is possible for the bob afterwards?

what is stokes law and terminal velocity?

an object of mass 2 kg is sliding with a cons†an t velocity of 4 m/s on a rough horizontal table under the action of 4 N horizontal force . if a 10 N force is applied instead of 4 N then the accelaration of the block is

What will be the expression for the angular magnification produced by the telescope?

An ideal gas is taken from an initial state i to a final state f in such a way that the ratio of the pressure to the absolute temperature remains constant. What will be the work done by the gas ?

A 800 kW, 11 kV, 3-phase star-connected synchronous motor has a synchronous reactance of 35Ω/phase and negligible resistance. The motor is operating on full-load at 0.8 pf leading. The efficiency is 95%. The excitation emf per phase is _______kV.7.668

In a convex lens of focal length F, the minimum distance between an object and it's real image must be? a) 3F b) 4F c) 3/2F d) 2F

A CLOSED CYLINDRICAL TUBE CONTAINS SOME WATER LIES IN AHORIZONTAL PLANE IF TUBE IS ROTATED ABOUT A PERPENDICULAR BISECTOR THE MOMENT OF INERTIA OF WATER ABOUT THE AXIS\lbrack

When 100 V dc is supplied across a solenoid, a current of 1.0 A flows in it. When 100 V ac is applied across the same coil, the current drops to 0.5 A. If the frequency of ac source is 50 Hz, then the impedance and inductance of the solenoid are

Three concentric metal shells A,B and C of respective radii a,b and c (a<b<c) have surface charge densities +σ,−σ and +σ respectively. The potential of shell B is