50278 + Interview Questions in Physics

1.	E, m, J and G denote energy, mass, angular momentum and gravitational constant respectively.Then the dimensions of
Answer» E, m, J and G denote energy, mass, angular momentum and gravitational constant respectively. Then the dimensions of

1.

E, m, J and G denote energy, mass, angular momentum and gravitational constant respectively.Then the dimensions of

Answer»

E, m, J and G denote energy, mass, angular momentum and gravitational constant respectively.

Then the dimensions of

2.	A ball is thrown from point A and it reaches point B which is 7m away. Given that the ball follows a straight path and point C lies on the line AB and AC = 9m, BC=2m. Which point lies between the other two and draw the path of the ball? [1 MARK]
Answer» A ball is thrown from point A and it reaches point B which is 7m away. Given that the ball follows a straight path and point C lies on the line AB and AC = 9m, BC=2m. Which point lies between the other two and draw the path of the ball? [1 MARK]

Discussion

3.	The advantages of using dielectrics are :
Answer» The advantages of using dielectrics are :

Discussion

4.	A small mass m is pulled to top of frictionless half cylinder by a rope passing over cylinder. If m is moving slowly at constant speed, find work done by force F in moving mass from bottom to top of cylinder.
Answer» A small mass $m$ is pulled to top of frictionless half cylinder by a rope passing over cylinder. If $m$ is moving slowly at constant speed, find work done by force $F$ in moving mass from bottom to top of cylinder.

Discussion

5.	The output of the combination of the gates shown in fig is
Answer» The output of the combination of the gates shown in fig is

5.

The output of the combination of the gates shown in fig is

Answer»

The output of the combination of the gates shown in fig is

Discussion

6.	The length of the minute hand of a clock is 8 cm. Find the distance travelled by its outer end in 15 minutes.
Answer» The length of the minute hand of a clock is 8 cm. Find the distance travelled by its outer end in 15 minutes.

Discussion

7.	The bob of a simple pendulum has mass 2 g and a charge of 5.0 μC. It is at rest in a uniform horizontal electric field of intensity 2000 V/m. At equilibrium, the angle that the pendulum makes with the vertical is (take g=10 m/s2).
Answer» The bob of a simple pendulum has mass $2 g$ and a charge of $5.0 μ C$ . It is at rest in a uniform horizontal electric field of intensity $2000 V / m$ . At equilibrium, the angle that the pendulum makes with the vertical is (take $g = 10 m / s^{2})$ .

Discussion

8.	A ring of radius r carries a charge Q, uniformly distributed along its circumference. What is the ratio of the electric field strength at a distance R to that at a distance R√2 along the axis?
Answer» A ring of radius r carries a charge Q, uniformly distributed along its circumference. What is the ratio of the electric field strength at a distance R to that at a distance $\frac{R}{\sqrt{2}}$ along the axis?

Discussion

9.	Two particles execute SHM of the same amplitude and frequency along the same straight line. They pass one another when going in opposite directions each time their displacement is half their amplitude. What is the phase difference between them?
Answer» Two particles execute SHM of the same amplitude and frequency along the same straight line. They pass one another when going in opposite directions each time their displacement is half their amplitude. What is the phase difference between them?

Discussion

10.	From a disc of radius R and mass M, a circular hole of diameter R, whose rim passes through the center is cut. What is the moment of inertia of the remaining part of the disc about a perpendicular axis passing through the center?
Answer» From a disc of radius $R$ and mass $M$ , a circular hole of diameter $R$ , whose rim passes through the center is cut. What is the moment of inertia of the remaining part of the disc about a perpendicular axis passing through the center?

Discussion

11.	A small sized mass m is attached by a massless string (of length L) to the top of a fixed frictionless solid cone whose axis is vertical. The half angle at the vertex of the cone is θ. If the mass m moves around in a horizontal circle at speed v, what is the maximum value of v for which the mass stays in contact with the cone? (g is acceleration due to gravity)
Answer» A small sized mass $m$ is attached by a massless string (of length $L$ ) to the top of a fixed frictionless solid cone whose axis is vertical. The half angle at the vertex of the cone is $θ$ . If the mass $m$ moves around in a horizontal circle at speed $v$ , what is the maximum value of $v$ for which the mass stays in contact with the cone? ( $g$ is acceleration due to gravity)

Discussion

12.	The angle which a vector ^i−^j+√2^k makes with x-axis is
Answer» The angle which a vector $^i -^j + \sqrt{2}^k$ makes with x-axis is

Discussion

13.	A box P and a coil Q are connected in series with an ac source of variable frequency. The emf of the source is constant at 10 V. Box P contains a capacitance of 1 μF in series with a resistance of 32 Ω. Coil Q has a self inductance of 4.9 mH and a resistance of 68 Ω in series. The frequency is adjusted so that maximum current flows in P and Q. The impedance of P at this frequency is
Answer» A box P and a coil Q are connected in series with an ac source of variable frequency. The emf of the source is constant at $10 V$ . Box P contains a capacitance of $1 μ F$ in series with a resistance of $32 Ω$ . Coil Q has a self inductance of 4.9 mH and a resistance of $68 Ω$ in series. The frequency is adjusted so that maximum current flows in P and Q. The impedance of P at this frequency is

Discussion

14.	In a forward biased p – n junction diode, the potential barrier in the depletion region is of the form
Answer» In a forward biased p – n junction diode, the potential barrier in the depletion region is of the form

Discussion

15.	A particle starts moving with initial velocity 3 m/s along x-axis from origin. Its acceleration is varying with x in parabolic nature as shown in figure. At x=√3 m tangent to the graph makes an angle 60∘ with positive x-axis as shown in diagram. Then at x =√3
Answer» A particle starts moving with initial velocity 3 m/s along x-axis from origin. Its acceleration is varying with x in parabolic nature as shown in figure. At $x = \sqrt{3}$ m tangent to the graph makes an angle $60^{\circ}$ with positive x-axis as shown in diagram. Then at x = $\sqrt{3}$

15.

A particle starts moving with initial velocity 3 m/s along x-axis from origin. Its acceleration is varying with x in parabolic nature as shown in figure. At x=√3 m tangent to the graph makes an angle 60∘ with positive x-axis as shown in diagram. Then at x =√3

Answer»

A particle starts moving with initial velocity 3 m/s along x-axis from origin. Its acceleration is varying with x in parabolic nature as shown in figure. At $x = \sqrt{3}$ m tangent to the graph makes an angle $60^{\circ}$ with positive x-axis as shown in diagram. Then at x = $\sqrt{3}$

Discussion

16.	Two instruments having stretched strings are being played in unison. When the tension of one of the instruments is increased by 1%, 3 beats are produced in 2sec, the initial frequency of vibration of each wire is:
Answer» Two instruments having stretched strings are being played in unison. When the tension of one of the instruments is increased by 1%, 3 beats are produced in 2sec, the initial frequency of vibration of each wire is:

Discussion

17.	The distance advanced by screw of a screw gauge is 2mm in four rotation. Its cap is divided into 50 division. There is no zero error. If the screw reads 3 divisions on the main scale and 32 divisions on the cap, then the diameter of the wire is____.
Answer» The distance advanced by screw of a screw gauge is 2mm in four rotation. Its cap is divided into 50 division. There is no zero error. If the screw reads 3 divisions on the main scale and 32 divisions on the cap, then the diameter of the wire is____.

Discussion

18.	The acceleration of block of mass 2 kg and 4 kg are respectively (pulleys and Threads are massless) (g=10 m/s2). a) a1 = 5 m/s2 , a2 = 2.5 m/s2 b) a1 = a2 = 0 c) a1 = a2 = 20/6 m/s2 d) a1 = 20 m/s2 , a2 = 5 m/s2
Answer» The acceleration of block of mass 2 kg and 4 kg are respectively (pulleys and Threads are massless) (g=10 m/s²). a) a₁= 5 m/s² , a₂= 2.5 m/s² b) a₁ = a₂ = 0 c) a₁ = a₂ = 20/6 m/s² d) a₁ = 20 m/s² , a₂ = 5 m/s²

18.

The acceleration of block of mass 2 kg and 4 kg are respectively (pulleys and Threads are massless) (g=10 m/s2). a) a1 = 5 m/s2 , a2 = 2.5 m/s2 b) a1 = a2 = 0 c) a1 = a2 = 20/6 m/s2 d) a1 = 20 m/s2 , a2 = 5 m/s2

Answer»

The acceleration of block of mass 2 kg and 4 kg are respectively (pulleys and Threads are massless) (g=10 m/s²).

a) a₁= 5 m/s² , a₂= 2.5 m/s²

b) a₁ = a₂ = 0

c) a₁ = a₂ = 20/6 m/s²

d) a₁ = 20 m/s² , a₂ = 5 m/s²

Discussion

19.	The operating temperature of an incandescent bulb (with a tungsten filament) of power 60 W is 3000 K. If the surface area of the filament be 25 mm2. Find its emissivity e.(σ=5.67×10−8W/m2−K4)
Answer» The operating temperature of an incandescent bulb (with a tungsten filament) of power $60 W$ is $3000 K$ . If the surface area of the filament be $25 {mm}^{2}$ . Find its emissivity $e$ . $(σ = 5.67 \times 10^{- 8} W / m^{2} - K^{4})$

Discussion

20.	System is shown in the figure and man is pulling the rope from both sides with constant speed ‘u′. Then what will be the velocity of the block, if the rope is inextensible?
Answer» System is shown in the figure and man is pulling the rope from both sides with constant speed $‘ u^{'}$ . Then what will be the velocity of the block, if the rope is inextensible?

Discussion

21.	A convex lens forms a real image of a point object placed on its principal axis. If the upper half of the lens is painted black,
Answer» A convex lens forms a real image of a point object placed on its principal axis. If the upper half of the lens is painted black,

Discussion

22.	If the speed of a vehicle increases by 2 m/s, its kinetic energy is doubled, then original speed of the vehicle is
Answer» If the speed of a vehicle increases by $2 m/s$ , its kinetic energy is doubled, then original speed of the vehicle is

Discussion

23.	A projectile thrown with velocity v making angle θ with vertical gains maximum height H in the time for which the projectile remains in air, the time period is
Answer» A projectile thrown with velocity $v$ making angle $θ$ with vertical gains maximum height $H$ in the time for which the projectile remains in air, the time period is

Discussion

24.	Which of these is a unit vector that makes an angle of 60∘ with the positive direction of x axis ?
Answer» Which of these is a unit vector that makes an angle of $60^{\circ}$ with the positive direction of x axis ?

Discussion

25.	Ratio of the longest wavelengths corresponding to the Lyman and Balmer series in the hydrogen spectrum is
Answer» Ratio of the longest wavelengths corresponding to the Lyman and Balmer series in the hydrogen spectrum is

Discussion

26.	Consider a compound slab consisting of two different materials having equal thickness and thermal conductivities K and 2K respectively. The equivalent thermal conductivity of the slab is
Answer» Consider a compound slab consisting of two different materials having equal thickness and thermal conductivities K and 2K respectively. The equivalent thermal conductivity of the slab is

Discussion

27.	A man walks on a straight road from his home to a market 2.5 km away with a speed of 5 km/h. Finding the market closed, he instantly turns and walks back home with a speed of 7.5 km/h. The average speed of the man over the interval of time 0 to 40 minutes, is equal to
Answer» A man walks on a straight road from his home to a market $2.5 k m$ away with a speed of $5 k m / h$ . Finding the market closed, he instantly turns and walks back home with a speed of $7.5 k m / h$ . The average speed of the man over the interval of time $0$ to $40$ minutes, is equal to

Discussion

28.	Why and how we are taking least count as mean absolute error in problems without actually calculating it?
Answer» Why and how we are taking least count as mean absolute error in problems without actually calculating it?

Discussion

29.	If a hollow metal sphere is given a charge Q and another conducting sphere is placed inside it concentrically. A charge q is placed at the centre. The charge that appears on the surface B of the inner sphere is
Answer» If a hollow metal sphere is given a charge Q and another conducting sphere is placed inside it concentrically. A charge q is placed at the centre. The charge that appears on the surface B of the inner sphere is

29.

If a hollow metal sphere is given a charge Q and another conducting sphere is placed inside it concentrically. A charge q is placed at the centre. The charge that appears on the surface B of the inner sphere is

Answer»

If a hollow metal sphere is given a charge Q and another conducting sphere is placed inside it concentrically. A charge q is placed at the centre. The charge that appears on the surface B of the inner sphere is

Discussion

30.	In the figure shown, what force ‘F′ should be applied perpendicular to the plane on the block for it to not move. Given that the coefficient of static friction between the plane and the block is 0.5. (Assume limiting case of friction and take g=10 m/s2)
Answer» In the figure shown, what force $‘ F^{'}$ should be applied perpendicular to the plane on the block for it to not move. Given that the coefficient of static friction between the plane and the block is $0.5$ . (Assume limiting case of friction and take $g = 10 {m/s}^{2}$ )

Discussion

31.	Write two differential vectors having same magnitude.
Answer» Write two differential vectors having same magnitude.

Discussion

32.	A ball of mass 5 kg is dropped from a cliff of height 75 m. What is the ratio of the kinetic energy to the potential energy of the ball when it reaches the halfway point of the fall?
Answer» A ball of mass $5 kg$ is dropped from a cliff of height $75 m$ . What is the ratio of the kinetic energy to the potential energy of the ball when it reaches the halfway point of the fall?

Discussion

33.	Calculate de-Broglie wavelength of an electron travelling at 1% of the speed of light
Answer» Calculate de-Broglie wavelength of an electron travelling at 1% of the speed of light

Discussion

34.	Can you explain or prove me that why dimensional methods are applicable for only three quantity?I know it by definition but not conceptually.
Answer» Can you explain or prove me that why dimensional methods are applicable for only three quantity?I know it by definition but not conceptually.

Discussion

35.	Vibrational Energy is
Answer» Vibrational Energy is

Discussion

36.	A simple pendulum with a brass bob has a time period T. The bob is now immersed in a non-viscous liquid and oscillated. If the density of the liquid is 18 that of brass, the time period of the same pendulum will be
Answer» A simple pendulum with a brass bob has a time period T. The bob is now immersed in a non-viscous liquid and oscillated. If the density of the liquid is $\frac{1}{8}$ that of brass, the time period of the same pendulum will be

Discussion

37.	At what absolute temperature T is the root mean square speed of a hydrogen molecule equal to its escape velocity from the surface of the moon? The radius of moon is R, g is the acceleration due to gravity on moon's surface, m is the mass of a hydrogen molecule and k is the Boltzmann constant
Answer» At what absolute temperature T is the root mean square speed of a hydrogen molecule equal to its escape velocity from the surface of the moon? The radius of moon is R, g is the acceleration due to gravity on moon's surface, m is the mass of a hydrogen molecule and k is the Boltzmann constant

Discussion

38.	What is the pressure inside the drop of mercury of radius 3.00 mm at room temperature? Surface tension of mercury at that temperature (20∘C) is 4.65×10–1Nm–1 . The atmospheric pressure is 1.01×105 Pa. Also give the excess pressure inside the drop.
Answer» What is the pressure inside the drop of mercury of radius 3.00 mm at room temperature? Surface tension of mercury at that temperature $(20^{\circ} C)$ is $4.65 \times 10^{- 1} N m^{- 1}$ . The atmospheric pressure is $1.01 \times 10^{5}$ Pa. Also give the excess pressure inside the drop.

Discussion

39.	Six stars of equal mass m are moving about the centre of mass of the system such they are always on the vertices of a regular hexagon of side length a. Their common time period will be
Answer» Six stars of equal mass m are moving about the centre of mass of the system such they are always on the vertices of a regular hexagon of side length a. Their common time period will be

Discussion

40.	Explain clearly, with examples, the distinction between: a) magnitude of displacement (sometimes called distance) over an interval of time, and the total length of path covered by a particle over the same interval; b) magnitude of average velocity over an interval of time, and the average speed over the same interval. [Average speed of a particle over an interval of time is defined as the total path length divided by the time interval]. Show in both (a) and (b) that the second quantity is either greater than or equal to the first. When is the equality sign true? [For simplicity, consider one-dimensional motion only].
Answer» Explain clearly, with examples, the distinction between: a) magnitude of displacement (sometimes called distance) over an interval of time, and the total length of path covered by a particle over the same interval; b) magnitude of average velocity over an interval of time, and the average speed over the same interval. [Average speed of a particle over an interval of time is defined as the total path length divided by the time interval]. Show in both (a) and (b) that the second quantity is either greater than or equal to the first. When is the equality sign true? [For simplicity, consider one-dimensional motion only].

Discussion

41.	There is a circular tube in a vertical plane. Two liquids are filled in the tube whose densities are given by 373kg/m3 and 100kg/m3 respectively . It is observed that the liquids do not mix and each liquid subtends an angle of 90∘ at the centre. Radius joining their interfaces makes an angle α with the vertical as shown in figure. Find the value of α (in degrees) is
Answer» There is a circular tube in a vertical plane. Two liquids are filled in the tube whose densities are given by $373 {kg/m}^{3}$ and $100 {kg/m}^{3}$ respectively . It is observed that the liquids do not mix and each liquid subtends an angle of $90^{\circ}$ at the centre. Radius joining their interfaces makes an angle $α$ with the vertical as shown in figure. Find the value of $α$ (in degrees) is

Discussion

42.	Difference between conservative force and non conservative force ?
Answer» Difference between conservative force and non conservative force ?

Discussion

43.	From a solid sphere of mass M and radius R, a spherical portion of radius (R2) is removed as shown in the figure. Taking gravitational potential V=0 at r=∞, the potential at the centre of the cavity thus formed is (G = gravitational constant)
Answer» From a solid sphere of mass $M$ and radius $R$ , a spherical portion of radius $(\frac{R}{2})$ is removed as shown in the figure. Taking gravitational potential $V = 0$ at $r = \infty$ , the potential at the centre of the cavity thus formed is (G = gravitational constant)

Discussion

44.	A ball is projected vertically up with a velocity of 20 ms−1. Its velocity at the height of 15 m is (Take g=10 ms−2)
Answer» A ball is projected vertically up with a velocity of $20 m s^{- 1}$ . Its velocity at the height of $15 m$ is (Take $g = 10 m s^{- 2})$

Discussion

45.	The sun angular diameter is mesured to be 1920°.the distance d of the sun from the earth is 1.496×10^11 m . What is the diameter of the sun
Answer» The sun angular diameter is mesured to be 1920°.the distance d of the sun from the earth is 1.496×10^11 m . What is the diameter of the sun

Discussion

46.	A boy running on a circular track of radius 10 m completes 3 revolution and comes back to the point from where he started. Calculate the angular displacement of the boy (in rad).
Answer» A boy running on a circular track of radius $10 m$ completes $3$ revolution and comes back to the point from where he started. Calculate the angular displacement of the boy $(in rad)$ .

Discussion

47.	Infinite no.of bodies, each of mass 3kg are situated at distances 1m, 2m, 4m, 8m....... respectively on x-axis. The resultant intensity of gravitational field at the origin will be
Answer» Infinite no.of bodies, each of mass 3kg are situated at distances 1m, 2m, 4m, 8m....... respectively on x-axis. The resultant intensity of gravitational field at the origin will be

Discussion

48.	In which of the following instances would the path length of travel be useful?
Answer» In which of the following instances would the path length of travel be useful?

Discussion

49.	A plane electromagnetic waves of frequency 25 mega hertz travel in free space along x direction. At a particular point in the space and time E= 6.3j V/m.what is B vector of that point
Answer» A plane electromagnetic waves of frequency 25 mega hertz travel in free space along x direction. At a particular point in the space and time E= 6.3j V/m.what is B vector of that point

Discussion

50.	How many significant figures does 1150.0054 have???
Answer» How many significant figures does 1150.0054 have???

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

E, m, J and G denote energy, mass, angular momentum and gravitational constant respectively.Then the dimensions of

A ball is thrown from point A and it reaches point B which is 7m away. Given that the ball follows a straight path and point C lies on the line AB and AC = 9m, BC=2m. Which point lies between the other two and draw the path of the ball? [1 MARK]

The advantages of using dielectrics are :

A small mass m is pulled to top of frictionless half cylinder by a rope passing over cylinder. If m is moving slowly at constant speed, find work done by force F in moving mass from bottom to top of cylinder.

The output of the combination of the gates shown in fig is

The length of the minute hand of a clock is 8 cm. Find the distance travelled by its outer end in 15 minutes.

The bob of a simple pendulum has mass 2 g and a charge of 5.0 μC. It is at rest in a uniform horizontal electric field of intensity 2000 V/m. At equilibrium, the angle that the pendulum makes with the vertical is (take g=10 m/s2).

A ring of radius r carries a charge Q, uniformly distributed along its circumference. What is the ratio of the electric field strength at a distance R to that at a distance R√2 along the axis?

Two particles execute SHM of the same amplitude and frequency along the same straight line. They pass one another when going in opposite directions each time their displacement is half their amplitude. What is the phase difference between them?

From a disc of radius R and mass M, a circular hole of diameter R, whose rim passes through the center is cut. What is the moment of inertia of the remaining part of the disc about a perpendicular axis passing through the center?

The angle which a vector ^i−^j+√2^k makes with x-axis is

In a forward biased p – n junction diode, the potential barrier in the depletion region is of the form

A particle starts moving with initial velocity 3 m/s along x-axis from origin. Its acceleration is varying with x in parabolic nature as shown in figure. At x=√3 m tangent to the graph makes an angle 60∘ with positive x-axis as shown in diagram. Then at x =√3

Two instruments having stretched strings are being played in unison. When the tension of one of the instruments is increased by 1%, 3 beats are produced in 2sec, the initial frequency of vibration of each wire is:

The distance advanced by screw of a screw gauge is 2mm in four rotation. Its cap is divided into 50 division. There is no zero error. If the screw reads 3 divisions on the main scale and 32 divisions on the cap, then the diameter of the wire is____.

The acceleration of block of mass 2 kg and 4 kg are respectively (pulleys and Threads are massless) (g=10 m/s2). a) a1 = 5 m/s2 , a2 = 2.5 m/s2 b) a1 = a2 = 0 c) a1 = a2 = 20/6 m/s2 d) a1 = 20 m/s2 , a2 = 5 m/s2

The operating temperature of an incandescent bulb (with a tungsten filament) of power 60 W is 3000 K. If the surface area of the filament be 25 mm2. Find its emissivity e.(σ=5.67×10−8W/m2−K4)

System is shown in the figure and man is pulling the rope from both sides with constant speed ‘u′. Then what will be the velocity of the block, if the rope is inextensible?

A convex lens forms a real image of a point object placed on its principal axis. If the upper half of the lens is painted black,

If the speed of a vehicle increases by 2 m/s, its kinetic energy is doubled, then original speed of the vehicle is

A projectile thrown with velocity v making angle θ with vertical gains maximum height H in the time for which the projectile remains in air, the time period is

Which of these is a unit vector that makes an angle of 60∘ with the positive direction of x axis ?

Ratio of the longest wavelengths corresponding to the Lyman and Balmer series in the hydrogen spectrum is

Consider a compound slab consisting of two different materials having equal thickness and thermal conductivities K and 2K respectively. The equivalent thermal conductivity of the slab is

A man walks on a straight road from his home to a market 2.5 km away with a speed of 5 km/h. Finding the market closed, he instantly turns and walks back home with a speed of 7.5 km/h. The average speed of the man over the interval of time 0 to 40 minutes, is equal to

Why and how we are taking least count as mean absolute error in problems without actually calculating it?

If a hollow metal sphere is given a charge Q and another conducting sphere is placed inside it concentrically. A charge q is placed at the centre. The charge that appears on the surface B of the inner sphere is

In the figure shown, what force ‘F′ should be applied perpendicular to the plane on the block for it to not move. Given that the coefficient of static friction between the plane and the block is 0.5. (Assume limiting case of friction and take g=10 m/s2)

Write two differential vectors having same magnitude.

A ball of mass 5 kg is dropped from a cliff of height 75 m. What is the ratio of the kinetic energy to the potential energy of the ball when it reaches the halfway point of the fall?

Calculate de-Broglie wavelength of an electron travelling at 1% of the speed of light

Can you explain or prove me that why dimensional methods are applicable for only three quantity?I know it by definition but not conceptually.

Vibrational Energy is

A simple pendulum with a brass bob has a time period T. The bob is now immersed in a non-viscous liquid and oscillated. If the density of the liquid is 18 that of brass, the time period of the same pendulum will be

At what absolute temperature T is the root mean square speed of a hydrogen molecule equal to its escape velocity from the surface of the moon? The radius of moon is R, g is the acceleration due to gravity on moon's surface, m is the mass of a hydrogen molecule and k is the Boltzmann constant

What is the pressure inside the drop of mercury of radius 3.00 mm at room temperature? Surface tension of mercury at that temperature (20∘C) is 4.65×10–1Nm–1 . The atmospheric pressure is 1.01×105 Pa. Also give the excess pressure inside the drop.

Six stars of equal mass m are moving about the centre of mass of the system such they are always on the vertices of a regular hexagon of side length a. Their common time period will be

Difference between conservative force and non conservative force ?

From a solid sphere of mass M and radius R, a spherical portion of radius (R2) is removed as shown in the figure. Taking gravitational potential V=0 at r=∞, the potential at the centre of the cavity thus formed is (G = gravitational constant)

A ball is projected vertically up with a velocity of 20 ms−1. Its velocity at the height of 15 m is (Take g=10 ms−2)

The sun angular diameter is mesured to be 1920°.the distance d of the sun from the earth is 1.496×10^11 m . What is the diameter of the sun

A boy running on a circular track of radius 10 m completes 3 revolution and comes back to the point from where he started. Calculate the angular displacement of the boy (in rad).

Infinite no.of bodies, each of mass 3kg are situated at distances 1m, 2m, 4m, 8m....... respectively on x-axis. The resultant intensity of gravitational field at the origin will be

In which of the following instances would the path length of travel be useful?

A plane electromagnetic waves of frequency 25 mega hertz travel in free space along x direction. At a particular point in the space and time E= 6.3j V/m.what is B vector of that point

How many significant figures does 1150.0054 have???