50278 + Interview Questions in Physics Page 58 InterviewSolution

2851.	41.The equation of curve in which portion of y axis cut off between origin and tangent varies as cube of abscissa of point of conact is
Answer» 41.The equation of curve in which portion of y axis cut off between origin and tangent varies as cube of abscissa of point of conact is

Discussion

2852.	58 A monkey of mass 10 kg is climbing up on an ideal rope which passes through an ideal pulley and on other side of rope a block of mass 11 kg is hanging. The acceleration of monkey w.r.ti ropes 1ms-2 upward.initially both monkey and mass were at rest. The force exerted by hinge on pulley is?
Answer» 58 A monkey of mass 10 kg is climbing up on an ideal rope which passes through an ideal pulley and on other side of rope a block of mass 11 kg is hanging. The acceleration of monkey w.r.ti ropes 1ms-2 upward.initially both monkey and mass were at rest. The force exerted by hinge on pulley is?

Discussion

2853.	6. In two separate experiments the neutral points due to two small magnets are at a distance r and 2r in broad side on position. Ratio of their magnetic moment will be Options: 4 : 1 1 : 2 2 : 1 1 : 8
Answer» 6. In two separate experiments the neutral points due to two small magnets are at a distance r and 2r in broad side on position. Ratio of their magnetic moment will be Options: 4 : 1 1 : 2 2 : 1 1 : 8

Discussion

2854.	Two different coils have self-inductance L1=6 mH and L2=3 mH. The current in the first coil is increased at a constant rate. The current in the second coil is also increased at the same constant rate. At a certain instant of time, the power given to the two coils is the same. At that instant of time, the current, the induced voltage and the energy stored in the first coil are i1, V1 and W1 respectively. Corresponding values for the second coil at the same instant are i2, V2 and W2 respectively. Then
Answer» Two different coils have self-inductance $L_{1} = 6 mH$ and $L_{2} = 3 mH$ . The current in the first coil is increased at a constant rate. The current in the second coil is also increased at the same constant rate. At a certain instant of time, the power given to the two coils is the same. At that instant of time, the current, the induced voltage and the energy stored in the first coil are $i_{1}, V_{1} and W_{1}$ respectively. Corresponding values for the second coil at the same instant are $i_{2}, V_{2} and W_{2}$ respectively. Then

Discussion

2855.	A ball of mass m is thrown in air with speed v1 from a height h1 and it is at a height h2(>h1) when its speed becomes v2. Find the work done on the ball by the air resistance.
Answer» A ball of mass $m$ is thrown in air with speed $v_{1}$ from a height $h_{1}$ and it is at a height $h_{2} (> h_{1})$ when its speed becomes $v_{2}$ . Find the work done on the ball by the air resistance.

Discussion

2856.	A stationary Pulley carries a ropes one end of which supports a ladder with a man and other a counter weight of mass M . The man of mass M climbs up a distance `l' w.r.t the ladder and then stops.The displacement of the centre of mass of this system is 5x, then x is
Answer» A stationary Pulley carries a ropes one end of which supports a ladder with a man and other a counter weight of mass M . The man of mass M climbs up a distance `l' w.r.t the ladder and then stops.The displacement of the centre of mass of this system is 5x, then x is

Discussion

2857.	There is a small hole near the bottom of an open tank filled with a liquid. The speed of the water ejected does not depends on
Answer» There is a small hole near the bottom of an open tank filled with a liquid. The speed of the water ejected does not depends on

Discussion

2858.	two charges (-q m) and (+q m) are connected by a massless rod of length l and released in region of uniform electric field making an anhle of 60⁰ with itas shown the maximum speed of the charges
Answer» two charges (-q m) and (+q m) are connected by a massless rod of length l and released in region of uniform electric field making an anhle of 60⁰ with it as shown the maximum speed of the charges

Discussion

2859.	Why static friction does not depends on area of contact between two surfaces
Answer» Why static friction does not depends on area of contact between two surfaces

Discussion

2860.	In case of a projectile, the angular momentum is minimum
Answer» In case of a projectile, the angular momentum is minimum

Discussion

2861.	A car P moves due east with velocity 10 m/s and Q due west with velocity 15 m/s. At t=0 the separation btw them is 90 m , and the length cars is 5m then at what t will they completely cross each other ?
Answer» A car P moves due east with velocity 10 m/s and Q due west with velocity 15 m/s. At t=0 the separation btw them is 90 m , and the length cars is 5m then at what t will they completely cross each other ?

Discussion

2862.	A loop rolls on a horizontal ground without slipping with a linear speed 2 m/s. Speed of a particle P on the circumference of the loop at angle 60∘ is
Answer» A loop rolls on a horizontal ground without slipping with a linear speed $2 m/s .$ Speed of a particle $P$ on the circumference of the loop at angle $60^{\circ}$ is

Discussion

2863.	In the ideal gas equation PV=nRT, dimensional formula of R is
Answer» In the ideal gas equation $P V = n R T$ , dimensional formula of $R$ is

Discussion

2864.	67. To measure the potential difference across a resistance R a voltmeter of resistance R' is used .To measure the potential difference with a minimum accuracy of 95% , R' is related with R as (assume sorce current does not change)
Answer» 67. To measure the potential difference across a resistance R a voltmeter of resistance R' is used .To measure the potential difference with a minimum accuracy of 95% , R' is related with R as (assume sorce current does not change)

Discussion

2865.	A projectile can have the same range R for two angles of projection. If T1 and T2 be the time of flights in the two cases, then the product of the two time of flights is directly proportional to
Answer» A projectile can have the same range R for two angles of projection. If $T _{1} a n d T_{2}$ be the time of flights in the two cases, then the product of the two time of flights is directly proportional to

Discussion

2866.	If the mass of an atom is M and is moving with velocity v suddenly emits alpha Ray then find the final velocity of the body
Answer» If the mass of an atom is M and is moving with velocity v suddenly emits alpha Ray then find the final velocity of the body

Discussion

2867.	Which of the following graphs correctly represents the variation of speed of sound with temperature in a particular gas?
Answer» Which of the following graphs correctly represents the variation of speed of sound with temperature in a particular gas?

Discussion

2868.	In a Young's double slit experiment, the fringes are displaced by a distance x when a glass plate of refractive index 1.5 is introduced in the path of one of the beams. When this plate is replaced by another plate of same thickness, the shift of fringes is (3/2)x. The refractive index of second plate is
Answer» In a Young's double slit experiment, the fringes are displaced by a distance $x$ when a glass plate of refractive index $1.5$ is introduced in the path of one of the beams. When this plate is replaced by another plate of same thickness, the shift of fringes is $(3 / 2) x$ . The refractive index of second plate is

Discussion

2869.	Current in the inductor is 0.8 A while that in the capacitor is 0.6 A. The current drawn from the source is P×10−1 A. Then, find the value of P.
Answer» Current in the inductor is $0.8 A$ while that in the capacitor is $0.6 A$ . The current drawn from the source is $P \times 10^{- 1} A$ . Then, find the value of $P$ .

Discussion

2870.	Column-IColumn-II(a)ICl(p)Linear(b)BrF+2(q)Angular(c)ClF−4(r)Tetrahedral(d)AlCl−4(s)Square planar
Answer» $\begin{matrix} Column-I & Column-II (a) & I C l & (p) & Linear (b) & B r F_{2}^{+} & (q) & Angular (c) & C l F_{4}^{-} & (r) & Tetrahedral (d) & A l C l_{4}^{-} & (s) & Square planar \end{matrix}$

Discussion

2871.	a body constrained to move along the z-axis under a cons†an t force \xrightarrow[F]{}=-i∧+2j∧+3k∧.work done by this force in moving the body a dis†an ce 4m along the z-a
Answer» a body constrained to move along the z-axis under a cons†an t force \xrightarrow[F]{}=-i∧+2j∧+3k∧.work done by this force in moving the body a dis†an ce 4m along the z-a

Discussion

2872.	Calculate the number of coulombs required to deposit 5.4 g of Aluminium when the given electrode reaction isAl3++3e−→Al
Answer» Calculate the number of coulombs required to deposit $5.4 g$ of Aluminium when the given electrode reaction is $A l^{3 +} + 3 e^{-} \to A l$

Discussion

2873.

Match List - I with List - II. List - I List - IIa. h(Planck's Constant)i.[MLT−1]b. E(Kinetic Energy)ii.[ML2T−1]c. V(Electric Potential)iii.[ML2T−2]d. P(Linear Momentum) iv.[ML2I−1T−3]Choose the correct answer from the options given below.

Answer»

Match List - I with List - II.

List - I	List - II
$a . h$ $($ Planck's Constant $)$	$i . [M L T^{- 1}]$
$b . E$ $($ Kinetic Energy $)$	$i i . [M L^{2} T^{- 1}]$
$c . V$ $($ Electric Potential $)$	$i i i . [M L^{2} T^{- 2}]$
$d . P$ $($ Linear Momentum $)$	$i v . [M L^{2} I^{- 1} T^{- 3}]$

Choose the correct answer from the options given below.

Discussion

2874.	The brakes of a car moving at 20 m/s along a horizontal road are suddenly applied and it comes to rest after travelling some distance. If the coefficient of friction between the tyres and the road is 0.90, and it is assumed that all four tyres behave identically, find the shortest distance the car would travel before coming to a stop.
Answer» The brakes of a car moving at $20 m / s$ along a horizontal road are suddenly applied and it comes to rest after travelling some distance. If the coefficient of friction between the tyres and the road is $0.90$ , and it is assumed that all four tyres behave identically, find the shortest distance the car would travel before coming to a stop.

Discussion

2875.	why gravitation is more at the surface of earth and zero at centre but if we go by formulae, if radius is less then gravitation is more and if radius is more then gravitation is less
Answer» why gravitation is more at the surface of earth and zero at centre but if we go by formulae, if radius is less then gravitation is more and if radius is more then gravitation is less

Discussion

2876.	A disc of mass M and radius R is attached to a rectangular plate of the same mass M, breadth R and length 2R as shown in figure. The moment of inertia of the system about the axis AB passing through the centre of the disc and on the plane is I=1α(313MR2). Then, the value of α is
Answer» A disc of mass $M$ and radius $R$ is attached to a rectangular plate of the same mass $M$ , breadth $R$ and length $2 R$ as shown in figure. The moment of inertia of the system about the axis $A B$ passing through the centre of the disc and on the plane is $I = \frac{1}{α} (\frac{31}{3} M R^{2})$ . Then, the value of $α$ is

Discussion

2877.	Which of the following is correct assuming new cartesian sign convention?
Answer» Which of the following is correct assuming new cartesian sign convention?

Discussion

2878.	Thirteen resistances each of resistance R Ω are connected in the circuit as shown in the figure. The effective resistance between A and B is : -
Answer» Thirteen resistances each of resistance $R Ω$ are connected in the circuit as shown in the figure. The effective resistance between $A$ and $B$ is : -

Discussion

2879.	Which of the following factors do not affect the value of resistivity of a material?
Answer» Which of the following factors do not affect the value of resistivity of a material?

Discussion

2880.	Two separate air bubbles A and B of radii 0.004 m and 0.002 m formed of the same liquid surface tension 0.07 N/m come together to form a double bubble. Find the radius and the sense of curvature of the internal film surface common to both the bubbles.
Answer» Two separate air bubbles $A$ and $B$ of radii $0.004 m$ and $0.002 m$ formed of the same liquid surface tension $0.07 N/m$ come together to form a double bubble. Find the radius and the sense of curvature of the internal film surface common to both the bubbles.

Discussion

2881.	A hot air balloon loaded with sandbags has a total mass of M. It is descending with a downward acceleration of g/2, where g is the acceleration of free fall. How much sand must be released from the sandbags in order that hot air balloon ascends with the same acceleration? A. M/2B. M/3C. 2M/3D. 3M/4
Answer» A hot air balloon loaded with sandbags has a total mass of M. It is descending with a downward acceleration of g/2, where g is the acceleration of free fall. How much sand must be released from the sandbags in order that hot air balloon ascends with the same acceleration? A. M/2 B. M/3 C. 2M/3 D. 3M/4

Discussion

2882.	An infinitely long string uniformly charged with a linear charge density λ1 and a segment of length uniformly charged with linear charge density λ2 lie in a plane at right angles to each other and are separated by a distance r0 as shown in figure. The force with which these two interact is λ1λ24πϵ0ln(x), then find the value of x , if l=r0.
Answer» An infinitely long string uniformly charged with a linear charge density $λ_{1}$ and a segment of length uniformly charged with linear charge density $λ_{2}$ lie in a plane at right angles to each other and are separated by a distance $r_{0}$ as shown in figure. The force with which these two interact is $\frac{λ_{1} λ_{2}}{4 π ϵ_{0}} ln (x)$ , then find the value of $x$ , if $l = r_{0}$ .

Discussion

2883.	A screenis placed 90 cm from an object. The image of the object on the screenis formed by a convex lens at two different locations separated by 20cm. Determine the focal length of the lens.
Answer» A screen is placed 90 cm from an object. The image of the object on the screen is formed by a convex lens at two different locations separated by 20 cm. Determine the focal length of the lens.

Discussion

2884.	The figure shows the v - t graph of a particle moving in straight line. Find the time (in s) when particle returns to the starting point.
Answer» The figure shows the v - t graph of a particle moving in straight line. Find the time (in $s$ ) when particle returns to the starting point.

Discussion

2885.	a solid flywheel of 20 kg mass and 120 mm radius revolves at 600 RPM with what force must a brake lining be pressed against it for the flywheel to stop in 3 second if the coefficient of friction is 0.1
Answer» a solid flywheel of 20 kg mass and 120 mm radius revolves at 600 RPM with what force must a brake lining be pressed against it for the flywheel to stop in 3 second if the coefficient of friction is 0.1

Discussion

2886.	A ball is drop from some height and it hit the the ground and suddenly again bounce to the same height plot a X-T, V-T and A-T graphs and take downward direction of ball is negative and upward direction of ball is positive.
Answer» A ball is drop from some height and it hit the the ground and suddenly again bounce to the same height plot a X-T, V-T and A-T graphs and take downward direction of ball is negative and upward direction of ball is positive.

Discussion

2887.	A plane moving with velocity 'v' turns by 'theta' angle and it's speed remains 'v'. Find change in velocity of plane.
Answer» A plane moving with velocity 'v' turns by 'theta' angle and it's speed remains 'v'. Find change in velocity of plane.

Discussion

2888.	Find the electric field at the centre of a uniformly charged SOLID HEMISPHERE with volume charge density rho.
Answer» Find the electric field at the centre of a uniformly charged SOLID HEMISPHERE with volume charge density rho.

Discussion

2889.	The threshold energy is given as E0 and radiation of energy E falls on metal, then kinetic energy is given as 1)E-E0 /2 2)E-E0 3)E0-E 4)E/E0
Answer» The threshold energy is given as E0 and radiation of energy E falls on metal, then kinetic energy is given as 1)E-E0 /2 2)E-E0 3)E0-E 4)E/E0

Discussion

2890.	A battery of emf E0=12V is connected across a 4{m} long uniform wire having resistance 4Ωm. The cells of small emfs E1=2V and E2=4V having internal resistance 2Ω and 6Ω respectively, are connected as shown in the figure. If galvanometer shows no deflection at the point N, the distance of point N from the point A is equal to
Answer» A battery of emf $E_{0} = 12 V$ is connected across a 4{m} long uniform wire having resistance $\frac{4 Ω}{m}$ . The cells of small emfs $E_{1} = 2 V a n d E_{2} = 4 V$ having internal resistance $2 Ω$ and $6 Ω$ respectively, are connected as shown in the figure. If galvanometer shows no deflection at the point N, the distance of point N from the point A is equal to

2890.

A battery of emf E0=12V is connected across a 4{m} long uniform wire having resistance 4Ωm. The cells of small emfs E1=2V and E2=4V having internal resistance 2Ω and 6Ω respectively, are connected as shown in the figure. If galvanometer shows no deflection at the point N, the distance of point N from the point A is equal to

Answer»

A battery of emf $E_{0} = 12 V$ is connected across a 4{m} long uniform wire having resistance $\frac{4 Ω}{m}$ . The cells of small emfs $E_{1} = 2 V a n d E_{2} = 4 V$ having internal resistance $2 Ω$ and $6 Ω$ respectively, are connected as shown in the figure. If galvanometer shows no deflection at the point N, the distance of point N from the point A is equal to

Discussion

2891.	Four masses, m1=1 Kg, m2=3 Kg, m3=4 Kg and m4=2 Kg, are fixed on the circumference of a light circular frame of radius 1 m. The radius of gyration of this system about an axis passing through the centre of the circular frame and perpendicular to its plane would be,
Answer» Four masses, $m_{1} = 1 Kg, m_{2} = 3 Kg,$ $m_{3} = 4 Kg and m_{4} = 2 Kg,$ are fixed on the circumference of a light circular frame of radius $1 m$ . The radius of gyration of this system about an axis passing through the centre of the circular frame and perpendicular to its plane would be,

Discussion

2892.	Two sources S1 and S2 are emitting light of wavelength 600 nm are placed a distance 1.0×10−2 cm apart. A detector can be moved on the line S1P which is perpendicular to S1S2. Locate the position of the farthest minima detected.
Answer» Two sources $S_{1}$ and $S_{2}$ are emitting light of wavelength $600 nm$ are placed a distance $1.0 \times 10^{- 2} cm$ apart. A detector can be moved on the line $S_{1} P$ which is perpendicular to $S_{1} S_{2}$ . Locate the position of the farthest minima detected.

Discussion

2893.	The displacement of a charge Q in the electric field E=e1^i+e2^j+e3^k is ^r=a^i+b^j. The work done is
Answer» The displacement of a charge Q in the electric field $E = e_{1}^i + e_{2}^j + e_{3}^k$ is $^r = a^i + b^j$ . The work done is

Discussion

2894.	What is hydrogen? What are different types of hydrogen?
Answer» What is hydrogen? What are different types of hydrogen?

Discussion

2895.	Choose the correct alternative: (a) Alloys of metals usually have (greater/less) resistivity than that of their constituent metals. (b) Alloys usually have much (lower/higher) temperature coefficients of resistance than pure metals. (c) The resistivity of the alloy manganin is nearly independent of/increases rapidly with increase of temperature. (d) The resistivity of a typical insulator (e.g., amber) is greater than that of a metal by a factor of the order of (1022/103).
Answer» Choose the correct alternative: (a) Alloys of metals usually have (greater/less) resistivity than that of their constituent metals. (b) Alloys usually have much (lower/higher) temperature coefficients of resistance than pure metals. (c) The resistivity of the alloy manganin is nearly independent of/increases rapidly with increase of temperature. (d) The resistivity of a typical insulator (e.g., amber) is greater than that of a metal by a factor of the order of (10²²/10³).

2895.

Choose the correct alternative: (a) Alloys of metals usually have (greater/less) resistivity than that of their constituent metals. (b) Alloys usually have much (lower/higher) temperature coefficients of resistance than pure metals. (c) The resistivity of the alloy manganin is nearly independent of/increases rapidly with increase of temperature. (d) The resistivity of a typical insulator (e.g., amber) is greater than that of a metal by a factor of the order of (1022/103).

Answer»

Choose the correct
alternative:

(a) Alloys of metals usually have (greater/less) resistivity
than that of their constituent metals.

(b) Alloys usually have much (lower/higher) temperature
coefficients of resistance than pure metals.

(c) The resistivity of the alloy manganin is nearly
independent of/increases rapidly with increase of temperature.

(d) The resistivity of a typical insulator (e.g., amber) is
greater than that of a metal by a factor of the order of (10²²/10³).

Discussion

2896.	(i) What happens to the work done when the displacement of a body is at right angle to the direction of force acting on it? Explain your answer.(ii) A force of 50 N acts on a body and moves it a distance of 4 m on a horizontal surface. Calculate the work done if the direction of force is at an angle of 60° to the horizontal surface.
Answer» (i) What happens to the work done when the displacement of a body is at right angle to the direction of force acting on it? Explain your answer. (ii) A force of 50 N acts on a body and moves it a distance of 4 m on a horizontal surface. Calculate the work done if the direction of force is at an angle of 60° to the horizontal surface.

Discussion

2897.	57.Capacitor of capacitance c is charged to a potential difference V from a cell and then disconnected from it a charge + q0 is now given to its negative plate the potential difference across the capacitor will be
Answer» 57.Capacitor of capacitance c is charged to a potential difference V from a cell and then disconnected from it a charge + q0 is now given to its negative plate the potential difference across the capacitor will be

Discussion

2898.	A stone of mass 5 kg is tied to a string of length 2.5 m, is whirled round in a horizontal circle. What is the maximum angular velocity with which the stone can be whirled around, if the string can withstand a maximum tension of 1250 N ?
Answer» A stone of mass $5 kg$ is tied to a string of length $2.5 m$ , is whirled round in a horizontal circle. What is the maximum angular velocity with which the stone can be whirled around, if the string can withstand a maximum tension of $1250 N$ ?

Discussion

2899.	why glass slab donot disperse light
Answer» why glass slab donot disperse light

Discussion

2900.	A hollow sphere of radius 2 m is projected horizontally along a rough surface with velocity v0 and angular velocity ω0. Find out their ratio so that the sphere stops moving after some time.
Answer» A hollow sphere of radius $2 m$ is projected horizontally along a rough surface with velocity $v_{0}$ and angular velocity $ω_{0}$ . Find out their ratio so that the sphere stops moving after some time.

Discussion

Explore topic-wise InterviewSolutions in .

41.The equation of curve in which portion of y axis cut off between origin and tangent varies as cube of abscissa of point of conact is

58 A monkey of mass 10 kg is climbing up on an ideal rope which passes through an ideal pulley and on other side of rope a block of mass 11 kg is hanging. The acceleration of monkey w.r.ti ropes 1ms-2 upward.initially both monkey and mass were at rest. The force exerted by hinge on pulley is?

6. In two separate experiments the neutral points due to two small magnets are at a distance r and 2r in broad side on position. Ratio of their magnetic moment will be Options: 4 : 1 1 : 2 2 : 1 1 : 8

A ball of mass m is thrown in air with speed v1 from a height h1 and it is at a height h2(&gt;h1) when its speed becomes v2. Find the work done on the ball by the air resistance.

A stationary Pulley carries a ropes one end of which supports a ladder with a man and other a counter weight of mass M . The man of mass M climbs up a distance `l' w.r.t the ladder and then stops.The displacement of the centre of mass of this system is 5x, then x is

There is a small hole near the bottom of an open tank filled with a liquid. The speed of the water ejected does not depends on

two charges (-q m) and (+q m) are connected by a massless rod of length l and released in region of uniform electric field making an anhle of 60⁰ with itas shown the maximum speed of the charges

Why static friction does not depends on area of contact between two surfaces

In case of a projectile, the angular momentum is minimum

A car P moves due east with velocity 10 m/s and Q due west with velocity 15 m/s. At t=0 the separation btw them is 90 m , and the length cars is 5m then at what t will they completely cross each other ?

A loop rolls on a horizontal ground without slipping with a linear speed 2 m/s. Speed of a particle P on the circumference of the loop at angle 60∘ is

In the ideal gas equation PV=nRT, dimensional formula of R is

67. To measure the potential difference across a resistance R a voltmeter of resistance R' is used .To measure the potential difference with a minimum accuracy of 95% , R' is related with R as (assume sorce current does not change)

A projectile can have the same range R for two angles of projection. If T­1 and T2 be the time of flights in the two cases, then the product of the two time of flights is directly proportional to

If the mass of an atom is M and is moving with velocity v suddenly emits alpha Ray then find the final velocity of the body

Which of the following graphs correctly represents the variation of speed of sound with temperature in a particular gas?

Current in the inductor is 0.8 A while that in the capacitor is 0.6 A. The current drawn from the source is P×10−1 A. Then, find the value of P.

Column-IColumn-II(a)ICl(p)Linear(b)BrF+2(q)Angular(c)ClF−4(r)Tetrahedral(d)AlCl−4(s)Square planar

a body constrained to move along the z-axis under a cons†an t force \xrightarrow[F]{}=-i∧+2j∧+3k∧.work done by this force in moving the body a dis†an ce 4m along the z-a

Calculate the number of coulombs required to deposit 5.4 g of Aluminium when the given electrode reaction isAl3++3e−→Al

Match List - I with List - II. List - I List - IIa. h(Planck's Constant)i.[MLT−1]b. E(Kinetic Energy)ii.[ML2T−1]c. V(Electric Potential)iii.[ML2T−2]d. P(Linear Momentum) iv.[ML2I−1T−3]Choose the correct answer from the options given below.

why gravitation is more at the surface of earth and zero at centre but if we go by formulae, if radius is less then gravitation is more and if radius is more then gravitation is less

A disc of mass M and radius R is attached to a rectangular plate of the same mass M, breadth R and length 2R as shown in figure. The moment of inertia of the system about the axis AB passing through the centre of the disc and on the plane is I=1α(313MR2). Then, the value of α is

Which of the following is correct assuming new cartesian sign convention?

Thirteen resistances each of resistance R Ω are connected in the circuit as shown in the figure. The effective resistance between A and B is : -

Which of the following factors do not affect the value of resistivity of a material?

Two separate air bubbles A and B of radii 0.004 m and 0.002 m formed of the same liquid surface tension 0.07 N/m come together to form a double bubble. Find the radius and the sense of curvature of the internal film surface common to both the bubbles.

A hot air balloon loaded with sandbags has a total mass of M. It is descending with a downward acceleration of g/2, where g is the acceleration of free fall. How much sand must be released from the sandbags in order that hot air balloon ascends with the same acceleration? A. M/2B. M/3C. 2M/3D. 3M/4

A screenis placed 90 cm from an object. The image of the object on the screenis formed by a convex lens at two different locations separated by 20cm. Determine the focal length of the lens.

The figure shows the v - t graph of a particle moving in straight line. Find the time (in s) when particle returns to the starting point.

a solid flywheel of 20 kg mass and 120 mm radius revolves at 600 RPM with what force must a brake lining be pressed against it for the flywheel to stop in 3 second if the coefficient of friction is 0.1

A ball is drop from some height and it hit the the ground and suddenly again bounce to the same height plot a X-T, V-T and A-T graphs and take downward direction of ball is negative and upward direction of ball is positive.

A plane moving with velocity 'v' turns by 'theta' angle and it's speed remains 'v'. Find change in velocity of plane.

Find the electric field at the centre of a uniformly charged SOLID HEMISPHERE with volume charge density rho.

The threshold energy is given as E0 and radiation of energy E falls on metal, then kinetic energy is given as 1)E-E0 /2 2)E-E0 3)E0-E 4)E/E0

Four masses, m1=1 Kg, m2=3 Kg, m3=4 Kg and m4=2 Kg, are fixed on the circumference of a light circular frame of radius 1 m. The radius of gyration of this system about an axis passing through the centre of the circular frame and perpendicular to its plane would be,

Two sources S1 and S2 are emitting light of wavelength 600 nm are placed a distance 1.0×10−2 cm apart. A detector can be moved on the line S1P which is perpendicular to S1S2. Locate the position of the farthest minima detected.

The displacement of a charge Q in the electric field E=e1^i+e2^j+e3^k is ^r=a^i+b^j. The work done is

What is hydrogen? What are different types of hydrogen?

57.Capacitor of capacitance c is charged to a potential difference V from a cell and then disconnected from it a charge + q0 is now given to its negative plate the potential difference across the capacitor will be

A stone of mass 5 kg is tied to a string of length 2.5 m, is whirled round in a horizontal circle. What is the maximum angular velocity with which the stone can be whirled around, if the string can withstand a maximum tension of 1250 N ?

why glass slab donot disperse light

A hollow sphere of radius 2 m is projected horizontally along a rough surface with velocity v0 and angular velocity ω0. Find out their ratio so that the sphere stops moving after some time.

A ball of mass m is thrown in air with speed v1 from a height h1 and it is at a height h2(>h1) when its speed becomes v2. Find the work done on the ball by the air resistance.

A projectile can have the same range R for two angles of projection. If T1 and T2 be the time of flights in the two cases, then the product of the two time of flights is directly proportional to