50278 + Interview Questions in Physics Page 316 InterviewSolution

15751.	A compound microscope has a magnifying power of 100 when the image is formed at infinity. The objective has a focal length of 0.5 cm and the tube length is 6.5 cm, then the focal length of the eye-piece is -
Answer» A compound microscope has a magnifying power of $100$ when the image is formed at infinity. The objective has a focal length of $0.5 cm$ and the tube length is $6.5 cm,$ then the focal length of the eye-piece is -

Discussion

15752.	A and B are the two vectors and the angle between them is 60∘. If the resultant of these vectors are inclined at an angle of 45∘ to the vector B, then the value of BA is
Answer» $A$ and $B$ are the two vectors and the angle between them is $60^{\circ}$ . If the resultant of these vectors are inclined at an angle of $45^{\circ}$ to the vector $B$ , then the value of $\frac{B}{A}$ is

Discussion

15753.	56. What are the formula's of average and maximum power of a wave ?
Answer» 56. What are the formula's of average and maximum power of a wave ?

Discussion

15754.	For a transistor amplifier, the voltage gain
Answer» For a transistor amplifier, the voltage gain

Discussion

15755.	A magnet is suspended in such a way that it oscillates in the horizontal plane . It makes 20 oscillations per minute at a place where dip angle is 30° and 15 oscillations per minute at a place where dip angle is 60° . Ratio of the total Earth's magnetic field at the two places is
Answer» A magnet is suspended in such a way that it oscillates in the horizontal plane . It makes 20 oscillations per minute at a place where dip angle is 30° and 15 oscillations per minute at a place where dip angle is 60° . Ratio of the total Earth's magnetic field at the two places is

Discussion

15756.	Calculate the rate of flow of glycerine of density {1.20×10^3kg/m^3 through the conical section of a { pipe. If the radii ends 0.1m and 0.02m and the { pressure drop across the length is 120N/m^2
Answer» Calculate the rate of flow of glycerine of density {1.20×10^3kg/m^3 through the conical section of a { pipe. If the radii ends 0.1m and 0.02m and the { pressure drop across the length is 120N/m^2

Discussion

15757.	A biconvex lens with focal length f in air and refractive index of 1.5 is floating on the surface of a deep pond of water (refractive index 1.33). If an object is placed at a height of 2 f vertically above the lens, then the dis†an ce between the lens and the image is A. f B. 2 f C. less than 2 f D. greater than 2 f
Answer» A biconvex lens with focal length f in air and refractive index of 1.5 is floating on the surface of a deep pond of water (refractive index 1.33). If an object is placed at a height of 2 f vertically above the lens, then the dis†an ce between the lens and the image is A. f B. 2 f C. less than 2 f D. greater than 2 f

Discussion

15758.	In the propped cantilever beam carrying a uniformly distributed load 'w' N/m, shown in the following figure, the reaction at the support 'B' is
Answer» In the propped cantilever beam carrying a uniformly distributed load 'w' N/m, shown in the following figure, the reaction at the support 'B' is

Discussion

15759.	Define bounded function. And condition for a function to be bounded
Answer» Define bounded function. And condition for a function to be bounded

Discussion

15760.	Find the average value of current (in A) as shown graphically in the figure, from t=0 to t=2 s.
Answer» Find the average value of current (in A) as shown graphically in the figure, from $t = 0$ to $t = 2 s$ .

Discussion

15761.	76."Each of two large conducting parallel plates has one sided surface area A. If one of the plates is given a charge Q whereas the other is neutral, then the electric field at a point in between the plates is given by (in terms of Q, A and epsilon
Answer» 76."Each of two large conducting parallel plates has one sided surface area A. If one of the plates is given a charge Q whereas the other is neutral, then the electric field at a point in between the plates is given by (in terms of Q, A and epsilon

Discussion

15762.	If 0≤x<2π, then the number of real values of x, which satisfy the equation cosx + cos2x + cos3x + cos4x = 0, is:
Answer» If $0 \leq x < 2 π$ , then the number of real values of x, which satisfy the equation cosx + cos2x + cos3x + cos4x = 0, is:

Discussion

15763.	Coloumb's law is valid when - {Multiple correct}1 - Both charges are at rest 2 - Both are moving 3 - One is moving and one is at rest 4 - Medium is moving
Answer» Coloumb's law is valid when - {Multiple correct} 1 - Both charges are at rest 2 - Both are moving 3 - One is moving and one is at rest 4 - Medium is moving

Discussion

15764.	Water is drained from a vertical cylinderical tank by opening a valve at the base of the tank.It is known that the rate at which the water level drops is proportional to the square root of water depth y ,where the constant of proportionality k>0 depends on the acceleration due to gravity and the geometry of the hole.If t is measured in minutes and k=115, then the time(t) to drain the tank if the water is 4 m deep to start with is
Answer» Water is drained from a vertical cylinderical tank by opening a valve at the base of the tank.It is known that the rate at which the water level drops is proportional to the square root of water depth $y$ ,where the constant of proportionality $k > 0$ depends on the acceleration due to gravity and the geometry of the hole.If $t$ is measured in minutes and $k = \frac{1}{15}$ , then the time( $t$ ) to drain the tank if the water is 4 m deep to start with is

Discussion

15765.	Cleasesangled triangle situated in a uniformwhich is in the plane of theThe points A and B are at the samee of 15 V while the point C is at a potentialtriangleABC is a rightelectric field EisiPOl V AB 3cm and BC4 cm. Theof 200uaanitude of electric field is (in S.I. Units)f 203 cm125(1) 100(3) 167(4) 208
Answer» Cleasesangled triangle situated in a uniformwhich is in the plane of theThe points A and B are at the samee of 15 V while the point C is at a potentialtriangleABC is a rightelectric field EisiPOl V AB 3cm and BC4 cm. Theof 200uaanitude of electric field is (in S.I. Units)f 203 cm125(1) 100(3) 167(4) 208

Discussion

15766.	You have an optical kit that contains different lasers of wavelength 400nm, 500 nm & 700 nm, double slits with slit seperation 0.25 mm and 0.5 mm, a screen and an ordinary ruler [scale that you use in school]. Find minimum distance in meters that you can place the screen from the double slit to observe YDSE pattern on screen accurately .
Answer» You have an optical kit that contains different lasers of wavelength 400nm, 500 nm & 700 nm, double slits with slit seperation 0.25 mm and 0.5 mm, a screen and an ordinary ruler [scale that you use in school]. Find minimum distance in meters that you can place the screen from the double slit to observe YDSE pattern on screen accurately .

Discussion

15767.	63.Two small balls having equal positive charge q on each are suspended by to install ating strings of equal length from I from a hook to a stand.The whole set up a take in a satellite into space where is no gravity what is the angle between two strings? 90 degree 180 degree 0 degree 45 degree
Answer» 63.Two small balls having equal positive charge q on each are suspended by to install ating strings of equal length from I from a hook to a stand.The whole set up a take in a satellite into space where is no gravity what is the angle between two strings? 90 degree 180 degree 0 degree 45 degree

Discussion

15768.	why flourine is most electronegative?why not chlorine
Answer» why flourine is most electronegative?why not chlorine

Discussion

15769.	Let →a=^j−^k, →c=^i−^j−^k then →b satisfying →a×→b+→c=0 and →a.→b=3 is
Answer» Let $\to a =^j -^k, \to c =^i -^j -^k$ then $\to b$ satisfying $\to a \times \to b + \to c = 0$ and $\to a . \to b = 3$ is

Discussion

15770.	A rod of length 1 m is rotated about its one end in a perpendicular magnetic field B = 10 T. The emf induced between mid point and free end of rod is (angular velocity = 0.1 rad/s)
Answer» A rod of length 1 m is rotated about its one end in a perpendicular magnetic field B = 10 T. The emf induced between mid point and free end of rod is (angular velocity = 0.1 rad/s)

Discussion

15771.	If density(d),frequency (f)and velocity (v) are taken as fundamental quantities write the dimensions of force and angular momentum
Answer» If density(d),frequency (f)and velocity (v) are taken as fundamental quantities write the dimensions of force and angular momentum

Discussion

15772.	A glass slab (μ=1.5) of thickness 2 cm is placed on a spot. The shift of spot if it is viewed from top will be
Answer» A glass slab $(μ = 1.5)$ of thickness $2 cm$ is placed on a spot. The shift of spot if it is viewed from top will be

Discussion

15773.	An object of mass 0.5 kg is executing simple harmonic motion. Its amplitude is 5 cm and time period (T) is 0.2 s. What will be the potential energy of the object at an instant t=T4 s starting from the mean position . Assume that the initial phase of the oscillation is zero.
Answer» An object of mass $0.5 kg$ is executing simple harmonic motion. Its amplitude is $5 cm$ and time period $(T)$ is $0.2 s .$ What will be the potential energy of the object at an instant $t = \frac{T}{4} s$ starting from the mean position . Assume that the initial phase of the oscillation is zero.

Discussion

15774.	The image of an object, formed by a plano-convex lens at a distance of 8 m behind the lens, is real and is one third the size of the object. The wavelength of light inside the lens is 23 times the wavelength in free space. The magnitude of radius of the curved surface of the lens in meter is:
Answer» The image of an object, formed by a plano-convex lens at a distance of 8 m behind the lens, is real and is one third the size of the object. The wavelength of light inside the lens is $\frac{2}{3}$ times the wavelength in free space. The magnitude of radius of the curved surface of the lens in meter is:

Discussion

15775.	Four charges q,-2q,+2q,-q are placed respectively at the corners of a square of side a cm .what will be the magnitude of electroc field at the centre of square
Answer» Four charges q,-2q,+2q,-q are placed respectively at the corners of a square of side a cm .what will be the magnitude of electroc field at the centre of square

Discussion

15776.	A bar magnet of moment M is bent into letter S . If length of each part is same, its new magnetic moment will be
Answer» A bar magnet of moment M is bent into letter S . If length of each part is same, its new magnetic moment will be

Discussion

15777.	The forces F1andF2 in a brake and the direction of rotation of the drum are as shown in the figure. The coefficient of friction is 0.25. The angle of wrap is 3π2 radians. It is given that R=1m and F2=1N. The torque (in Nm) exerted on the drum is2.2482
Answer» The forces $F_{1} and F_{2}$ in a brake and the direction of rotation of the drum are as shown in the figure. The coefficient of friction is $0.25.$ The angle of wrap is $\frac{3 π}{2}$ radians. It is given that $R = 1$ m and $F_{2} = 1 N .$ The torque (in Nm) exerted on the drum is 2.2482

Discussion

15778.	Why does mass increases with velocity ?
Answer» Why does mass increases with velocity ?

Discussion

15779.	How to caluculate relative velocity with angle
Answer» How to caluculate relative velocity with angle

Discussion

15780.	A body of mass 5 kg is raised vertically to a height of 10 m by a force 170 N. The velocity of the body at this height is nearly equal to (Take g=10 ms−2)
Answer» A body of mass $5 kg$ is raised vertically to a height of $10 m$ by a force $170 N$ . The velocity of the body at this height is nearly equal to $(Take g = 10 {ms}^{- 2})$

Discussion

15781.	{ Two particles }A and }B having charges of }}{+2\cdot00×10^{-6}C and of }-4.00×10^{-6}C respectively are }}{ held fixed at a separation of }20\cdot0cm. Locate the point(s) }}{ on the line }AB where (a) the electric field is zero (b) the }} electric potential is zero.
Answer» { Two particles }A and }B having charges of }}{+2\cdot00×10^{-6}C and of }-4.00×10^{-6}C respectively are }}{ held fixed at a separation of }20\cdot0cm. Locate the point(s) }}{ on the line }AB where (a) the electric field is zero (b) the }} electric potential is zero.

Discussion

15782.	The potential at a point x (in m) due to some charge configuration on the x-axis is given by V(x)=(20x2−4) V. Find the electric field as a function of x.
Answer» The potential at a point x (in m) due to some charge configuration on the x-axis is given by $V (x) = (20 x^{2} - 4) V$ . Find the electric field as a function of x.

Discussion

15783.	Two point charges q1 = 3 × 10–6 C and q2 = 5 × 10–6 C are located at (3 m, 5 m, 1 m) and (1 m, 3 m, 2 m). Find the magnitude of force acting between them.
Answer» Two point charges q1 = 3 × 10–6 C and q2 = 5 × 10–6 C are located at (3 m, 5 m, 1 m) and (1 m, 3 m, 2 m). Find the magnitude of force acting between them.

Discussion

15784.	The force acting between the two charges which are at a distance d apart is F. If a copper plate of thickness d2 is placed between them, then the effective force will be xF. Find the value of x.
Answer» The force acting between the two charges which are at a distance $d$ apart is $F$ . If a copper plate of thickness $\frac{d}{2}$ is placed between them, then the effective force will be $x F$ . Find the value of $x$ .

Discussion

15785.	Two identical thin plano-concave lenses(μ1) each having radius of curvature of R are placed with their plane surface separated by a distance x. The space between the two lenses is filled with liquid(μ2). The focal length of the combination is
Answer» Two identical thin plano-concave lenses(μ1) each having radius of curvature of R are placed with their plane surface separated by a distance x. The space between the two lenses is filled with liquid(μ2). The focal length of the combination is

Discussion

15786.	From a 10m high building, stone A is dropped and simultaneously another stone B is thrown horizontally with an initial speed of 5m/s. If the time taken by A and B to reach the ground is t1 and t2 respectively, find t1 : t2
Answer» From a 10m high building, stone A is dropped and simultaneously another stone B is thrown horizontally with an initial speed of 5m/s. If the time taken by A and B to reach the ground is t1 and t2 respectively, find t1 : t2

Discussion

15787.	The escape velocity from the earth is about 11kms−1. The escape velocity from a planet having twice the radius and the same mean density as the earth, is
Answer» The escape velocity from the earth is about $11 k m s^{- 1}$ . The escape velocity from a planet having twice the radius and the same mean density as the earth, is

Discussion

15788.	When does distortion of electric current occurs when two oppositly charged plates are kept nearner to each other
Answer» When does distortion of electric current occurs when two oppositly charged plates are kept nearner to each other

Discussion

15789.	For small oscillations, a pendulum of length L is released from rest. Its length is L and time period is T. vertically below the point of suspension O, there is an obstacle P at a vertical distance x. the pendulum returns back to its original position after time 5T8. Find x.
Answer» For small oscillations, a pendulum of length L is released from rest. Its length is L and time period is T. vertically below the point of suspension O, there is an obstacle P at a vertical distance x. the pendulum returns back to its original position after time $\frac{5 T}{8}$ . Find x.

15789.

For small oscillations, a pendulum of length L is released from rest. Its length is L and time period is T. vertically below the point of suspension O, there is an obstacle P at a vertical distance x. the pendulum returns back to its original position after time 5T8. Find x.

Answer»

For small oscillations, a pendulum of length L is released from rest. Its length is L and time period is T. vertically below the point of suspension O, there is an obstacle P at a vertical distance x. the pendulum returns back to its original position after time $\frac{5 T}{8}$ . Find x.

Discussion

15790.	A person measures the time period of a simple pendulum inside a stationary lift and finds it to be T. If the lift starts accelerating upwards with an acceleration of g3, the time period of the pendulum will be
Answer» A person measures the time period of a simple pendulum inside a stationary lift and finds it to be $T$ . If the lift starts accelerating upwards with an acceleration of $\frac{g}{3}$ , the time period of the pendulum will be

Discussion

15791.	A cylindrical capacitor has two co-axial cylinders of length 15 cmand radii 1.5 cm and 1.4 cm. The outer cylinder is earthed and theinner cylinder is given a charge of 3.5 μC. Determine the capacitanceof the system and the potential of the inner cylinder. Neglect endeffects (i.e., bending of field lines at the ends).
Answer» A cylindrical capacitor has two co-axial cylinders of length 15 cmand radii 1.5 cm and 1.4 cm. The outer cylinder is earthed and theinner cylinder is given a charge of 3.5 μC. Determine the capacitanceof the system and the potential of the inner cylinder. Neglect endeffects (i.e., bending of field lines at the ends).

Discussion

15792.	The refractive indices of alcohol and turpentine oil with respect to air are 1.36 and 1.47respectively. Find the refractive index of turpentine oil with respect to alcohol. In which of the twomedia the speed of light will be more.
Answer» The refractive indices of alcohol and turpentine oil with respect to air are 1.36 and 1.47respectively. Find the refractive index of turpentine oil with respect to alcohol. In which of the twomedia the speed of light will be more.

Discussion

15793.	If R1 and R2 are the radii of curvature of the spherical surfaces of a thin lens and R1>R2, then this lense can correct 1)myopia 2)hypermetropia 3)presbiopia 4)astigmatism
Answer» If R1 and R2 are the radii of curvature of the spherical surfaces of a thin lens and R1>R2, then this lense can correct 1)myopia 2)hypermetropia 3)presbiopia 4)astigmatism

Discussion

15794.	In two pulley - particle figures (i) and (ii), the acceleration and force imparted by the string on the pulley and tension in the strings are, (a1,a2),(N1,N2), and (T1,T2) respectively. Ignoring friction in all contacting surfaces, which of the following relations is true?
Answer» In two pulley - particle figures (i) and (ii), the acceleration and force imparted by the string on the pulley and tension in the strings are, $(a_{1}, a_{2}), (N_{1}, N_{2})$ , and $(T_{1}, T_{2})$ respectively. Ignoring friction in all contacting surfaces, which of the following relations is true?

Discussion

15795.	30.A boy stands at 39.2m from a building and throw a ball which just passes through a window 19.6 m above the ground , find velocity of projection
Answer» 30.A boy stands at 39.2m from a building and throw a ball which just passes through a window 19.6 m above the ground , find velocity of projection

Discussion

15796.	In the given figure, all the collisions are elastic. Find the velocity of nth ball after collision.
Answer» In the given figure, all the collisions are elastic. Find the velocity of $n^{t h}$ ball after collision.

Discussion

15797.	The armature of a generator of resistance 1 Ω is rotated at its rated speed and produces 125 V without load and 115 V with full load. The current in the armature coil is (1) 240 A (2) 10A (3) 1A (4) 2A
Answer» The armature of a generator of resistance 1 Ω is rotated at its rated speed and produces 125 V without load and 115 V with full load. The current in the armature coil is (1) 240 A (2) 10A (3) 1A (4) 2A

Discussion

15798.	why only angle of incidence is used in order to find angle of deviation
Answer» why only angle of incidence is used in order to find angle of deviation

Discussion

15799.	A bullet of mass 0.25 kg is fired with velocity 302 m/s into a block of wood of mass m1=37.5kg.It gets embedded into it.The block m1 is resting on a long block m2 and the horizontal surface on which it is placed is smooth.The coefficient of friction betweeen m1 and m2 is 0.5.Find the displacement of m1 on m2 and the common velocity of m1 and m2.Mass m2=1.25kg.
Answer» A bullet of mass 0.25 kg is fired with velocity 302 m/s into a block of wood of mass m1=37.5kg.It gets embedded into it.The block m1 is resting on a long block m2 and the horizontal surface on which it is placed is smooth.The coefficient of friction betweeen m1 and m2 is 0.5.Find the displacement of m1 on m2 and the common velocity of m1 and m2.Mass m2=1.25kg.

Discussion

15800.	An object thrown vertically up from the ground passes the height 5m twice in an interval of 10s. What is its time of flight? (1.) \sqrt{28}s (2.) \sqrt{86}s (3.) \sqrt{104}s (4.) \sqrt{72
Answer» An object thrown vertically up from the ground passes the height 5m twice in an interval of 10s. What is its time of flight? (1.) \sqrt{28}s (2.) \sqrt{86}s (3.) \sqrt{104}s (4.) \sqrt{72

Discussion

Explore topic-wise InterviewSolutions in .

A compound microscope has a magnifying power of 100 when the image is formed at infinity. The objective has a focal length of 0.5 cm and the tube length is 6.5 cm, then the focal length of the eye-piece is -

A and B are the two vectors and the angle between them is 60∘. If the resultant of these vectors are inclined at an angle of 45∘ to the vector B, then the value of BA is

56. What are the formula's of average and maximum power of a wave ?

For a transistor amplifier, the voltage gain

A magnet is suspended in such a way that it oscillates in the horizontal plane . It makes 20 oscillations per minute at a place where dip angle is 30° and 15 oscillations per minute at a place where dip angle is 60° . Ratio of the total Earth's magnetic field at the two places is

Calculate the rate of flow of glycerine of density {1.20×10^3kg/m^3 through the conical section of a { pipe. If the radii ends 0.1m and 0.02m and the { pressure drop across the length is 120N/m^2

In the propped cantilever beam carrying a uniformly distributed load 'w' N/m, shown in the following figure, the reaction at the support 'B' is

Define bounded function. And condition for a function to be bounded

Find the average value of current (in A) as shown graphically in the figure, from t=0 to t=2 s.

76."Each of two large conducting parallel plates has one sided surface area A. If one of the plates is given a charge Q whereas the other is neutral, then the electric field at a point in between the plates is given by (in terms of Q, A and epsilon

If 0≤x&lt;2π, then the number of real values of x, which satisfy the equation cosx + cos2x + cos3x + cos4x = 0, is:

Coloumb's law is valid when - {Multiple correct}1 - Both charges are at rest 2 - Both are moving 3 - One is moving and one is at rest 4 - Medium is moving

63.Two small balls having equal positive charge q on each are suspended by to install ating strings of equal length from I from a hook to a stand.The whole set up a take in a satellite into space where is no gravity what is the angle between two strings? 90 degree 180 degree 0 degree 45 degree

why flourine is most electronegative?why not chlorine

Let →a=^j−^k, →c=^i−^j−^k then →b satisfying →a×→b+→c=0 and →a.→b=3 is

A rod of length 1 m is rotated about its one end in a perpendicular magnetic field B = 10 T. The emf induced between mid point and free end of rod is (angular velocity = 0.1 rad/s)

If density(d),frequency (f)and velocity (v) are taken as fundamental quantities write the dimensions of force and angular momentum

A glass slab (μ=1.5) of thickness 2 cm is placed on a spot. The shift of spot if it is viewed from top will be

An object of mass 0.5 kg is executing simple harmonic motion. Its amplitude is 5 cm and time period (T) is 0.2 s. What will be the potential energy of the object at an instant t=T4 s starting from the mean position . Assume that the initial phase of the oscillation is zero.

The image of an object, formed by a plano-convex lens at a distance of 8 m behind the lens, is real and is one third the size of the object. The wavelength of light inside the lens is 23 times the wavelength in free space. The magnitude of radius of the curved surface of the lens in meter is:

Four charges q,-2q,+2q,-q are placed respectively at the corners of a square of side a cm .what will be the magnitude of electroc field at the centre of square

A bar magnet of moment M is bent into letter S . If length of each part is same, its new magnetic moment will be

The forces F1andF2 in a brake and the direction of rotation of the drum are as shown in the figure. The coefficient of friction is 0.25. The angle of wrap is 3π2 radians. It is given that R=1m and F2=1N. The torque (in Nm) exerted on the drum is2.2482

Why does mass increases with velocity ?

How to caluculate relative velocity with angle

A body of mass 5 kg is raised vertically to a height of 10 m by a force 170 N. The velocity of the body at this height is nearly equal to (Take g=10 ms−2)

{ Two particles }A and }B having charges of }}{+2\cdot00×10^{-6}C and of }-4.00×10^{-6}C respectively are }}{ held fixed at a separation of }20\cdot0cm. Locate the point(s) }}{ on the line }AB where (a) the electric field is zero (b) the }} electric potential is zero.

The potential at a point x (in m) due to some charge configuration on the x-axis is given by V(x)=(20x2−4) V. Find the electric field as a function of x.

Two point charges q1 = 3 × 10–6 C and q2 = 5 × 10–6 C are located at (3 m, 5 m, 1 m) and (1 m, 3 m, 2 m). Find the magnitude of force acting between them.

The force acting between the two charges which are at a distance d apart is F. If a copper plate of thickness d2 is placed between them, then the effective force will be xF. Find the value of x.

Two identical thin plano-concave lenses(μ1) each having radius of curvature of R are placed with their plane surface separated by a distance x. The space between the two lenses is filled with liquid(μ2). The focal length of the combination is

From a 10m high building, stone A is dropped and simultaneously another stone B is thrown horizontally with an initial speed of 5m/s. If the time taken by A and B to reach the ground is t1 and t2 respectively, find t1 : t2

The escape velocity from the earth is about 11kms−1. The escape velocity from a planet having twice the radius and the same mean density as the earth, is

When does distortion of electric current occurs when two oppositly charged plates are kept nearner to each other

For small oscillations, a pendulum of length L is released from rest. Its length is L and time period is T. vertically below the point of suspension O, there is an obstacle P at a vertical distance x. the pendulum returns back to its original position after time 5T8. Find x.

A person measures the time period of a simple pendulum inside a stationary lift and finds it to be T. If the lift starts accelerating upwards with an acceleration of g3, the time period of the pendulum will be

The refractive indices of alcohol and turpentine oil with respect to air are 1.36 and 1.47respectively. Find the refractive index of turpentine oil with respect to alcohol. In which of the twomedia the speed of light will be more.

If R1 and R2 are the radii of curvature of the spherical surfaces of a thin lens and R1>R2, then this lense can correct 1)myopia 2)hypermetropia 3)presbiopia 4)astigmatism

In two pulley - particle figures (i) and (ii), the acceleration and force imparted by the string on the pulley and tension in the strings are, (a1,a2),(N1,N2), and (T1,T2) respectively. Ignoring friction in all contacting surfaces, which of the following relations is true?

30.A boy stands at 39.2m from a building and throw a ball which just passes through a window 19.6 m above the ground , find velocity of projection

In the given figure, all the collisions are elastic. Find the velocity of nth ball after collision.

The armature of a generator of resistance 1 Ω is rotated at its rated speed and produces 125 V without load and 115 V with full load. The current in the armature coil is (1) 240 A (2) 10A (3) 1A (4) 2A

why only angle of incidence is used in order to find angle of deviation

An object thrown vertically up from the ground passes the height 5m twice in an interval of 10s. What is its time of flight? (1.) \sqrt{28}s (2.) \sqrt{86}s (3.) \sqrt{104}s (4.) \sqrt{72

If 0≤x<2π, then the number of real values of x, which satisfy the equation cosx + cos2x + cos3x + cos4x = 0, is: