50278 + Interview Questions in Physics Page 298 InterviewSolution

14851.	A rectangular lamina in the x−y plane is shown below:Density of this lamina is constant along x axis and varies along y axis. If the variation in density is given as ρ(y)=16ρ0y2, then the coordinates of COM will be
Answer» A rectangular lamina in the $x - y$ plane is shown below: Density of this lamina is constant along $x$ axis and varies along $y$ axis. If the variation in density is given as $ρ (y) = 16 ρ_{0} y^{2}$ , then the coordinates of $C O M$ will be

Discussion

14852.	A ball is thrown vertically upward from the top of a tower. Velocity at depth h from the point of projection is twice of the velocity at height h above the point of projection. Find the maximum height reached by the ball.
Answer» A ball is thrown vertically upward from the top of a tower. Velocity at depth $h$ from the point of projection is twice of the velocity at height $h$ above the point of projection. Find the maximum height reached by the ball.

Discussion

14853.	At constant volume, specific heat of ideal gaseous mixture is 116R, then the value of adiabatic constant will be
Answer» At constant volume, specific heat of ideal gaseous mixture is $\frac{11}{6} R,$ then the value of adiabatic constant will be

Discussion

14854.	Between two stations a train starting from rest first accelerates uniformly, then moves with constant velocity and finally retards uniformly to come to rest. If the ratio of the time taken is 1:8:1 and the maximum speed attained is 60km/hr, then what is the average speed over the whole journey?
Answer» Between two stations a train starting from rest first accelerates uniformly, then moves with constant velocity and finally retards uniformly to come to rest. If the ratio of the time taken is 1:8:1 and the maximum speed attained is 60km/hr, then what is the average speed over the whole journey?

Discussion

14855.	Find the angle r and r′, if a light ray is incident on surface AB of prism having prism angle 60∘ as shown.
Answer» Find the angle $r$ and $r^{'}$ , if a light ray is incident on surface AB of prism having prism angle $60^{\circ}$ as shown.

Discussion

14856.	A water treatment plant having flow rate of 600 m3/hr has to remove 80% of the particles having a settling velocity of 0.18 cm/sec. The required plan area of a Type - I settling tank is
Answer» A water treatment plant having flow rate of $600 m^{3} / h r$ has to remove 80% of the particles having a settling velocity of $0.18 c m / s e c$ . The required plan area of a Type - I settling tank is

Discussion

14857.	Two identical small bodies each of mass m and charge q are suspended from two strings each of length l from a fixed point.This whole system is taken into an orbiting artificial satellite,then find the tension in strings
Answer» Two identical small bodies each of mass m and charge q are suspended from two strings each of length l from a fixed point.This whole system is taken into an orbiting artificial satellite,then find the tension in strings

Discussion

14858.	An ideal gas in a thermally insulated container, at internal pressure P1, volume V1 and absolute temperature T1 expands irreversibly against zero external pressure so that the pressure of gas becomes P2, volume V2 and temperature T2. Which of the following statement(s) is / are incorrect?
Answer» An ideal gas in a thermally insulated container, at internal pressure $P_{1},$ volume $V_{1}$ and absolute temperature $T_{1}$ expands irreversibly against zero external pressure so that the pressure of gas becomes $P_{2},$ volume $V_{2}$ and temperature $T_{2}$ . Which of the following statement(s) is / are incorrect?

Discussion

14859.	A wave of 600 µm wavelength is incident normally on a slit of 1.2 mm width. The value of diffraction angle corresponding to the first minima will be (in radians) -
Answer» A wave of $600 µm$ wavelength is incident normally on a slit of $1.2 mm$ width. The value of diffraction angle corresponding to the first minima will be (in radians) -

Discussion

14860.	The edges of a parallelepiped are given by the vectors (2 ^i+3^j+4^k), 4^j and 5^j+m^k. What should be the value of m in order that the volume of the parallelepiped be 24?
Answer» The edges of a parallelepiped are given by the vectors $(2^i + 3^j + 4^k), 4^j$ and $5^j + m^k .$ What should be the value of $m$ in order that the volume of the parallelepiped be 24?

Discussion

14861.	what happens if absolute rest is possible?
Answer» what happens if absolute rest is possible?

Discussion

14862.	If →A=2^i+3^j−^k and →B=−^i+3^j+4^k then projection of →A on →B
Answer» If $\to A = 2^i + 3^j -^k and \to B = -^i + 3^j + 4^k$ then projection of $\to A on \to B$

Discussion

14863.	a double star is composite system of two stars rotating about their centre of mass under their mutual gravitational attraction .let us consider such a double star which has two stars of masss m each at seperation l if T is the time period of rotation about their centres of mass then find T
Answer» a double star is composite system of two stars rotating about their centre of mass under their mutual gravitational attraction .let us consider such a double star which has two stars of masss m each at seperation l if T is the time period of rotation about their centres of mass then find T

Discussion

14864.	ntWhat is the potential inside a uniformly charged non conducting sphere?n
Answer» ntWhat is the potential inside a uniformly charged non conducting sphere?n

Discussion

14865.	If the potential energy of a satellite is −2 MJ, then the binding energy of the satellite is
Answer» If the potential energy of a satellite is $- 2 MJ$ , then the binding energy of the satellite is

Discussion

14866.	A tank is filled upto a height H. The horizontal range of water coming out of the hole which is at depth H4 from the surface level of water is
Answer» A tank is filled upto a height $H$ . The horizontal range of water coming out of the hole which is at depth $\frac{H}{4}$ from the surface level of water is

Discussion

14867.	Two small rings O and O' are put on two vertical stationary rods AB and A'B', respectively. One end of an inextensible thread is tied at point A'. The thread passes through ring O' and its other end is tied to ring O. Assuming that ring O' moves downwards at a constant velocity v1, then velocity v2 of the ring O, when ∠AOO' = α,
Answer» Two small rings O and O' are put on two vertical stationary rods AB and A'B', respectively. One end of an inextensible thread is tied at point A'. The thread passes through ring O' and its other end is tied to ring O. Assuming that ring O' moves downwards at a constant velocity $v_{1}$ , then velocity $v_{2}$ of the ring O, when $∠$ AOO' = $α$ ,

14867.

Two small rings O and O' are put on two vertical stationary rods AB and A'B', respectively. One end of an inextensible thread is tied at point A'. The thread passes through ring O' and its other end is tied to ring O. Assuming that ring O' moves downwards at a constant velocity v1, then velocity v2 of the ring O, when ∠AOO' = α,

Answer»

Two small rings O and O' are put on two vertical stationary rods AB and A'B', respectively. One end of an inextensible thread is tied at point A'. The thread passes through ring O' and its other end is tied to ring O. Assuming that ring O' moves downwards at a constant velocity $v_{1}$ , then velocity $v_{2}$ of the ring O, when $∠$ AOO' = $α$ ,

Discussion

14868.	1. A disc having charge Q , radius R is rotating with a constant angular velocity Omega about its own axis . find magnetic field at a distance x from the centre on its axis
Answer» 1. A disc having charge Q , radius R is rotating with a constant angular velocity Omega about its own axis . find magnetic field at a distance x from the centre on its axis

Discussion

14869.	How does a point charge can move in a electric field What causes it
Answer» How does a point charge can move in a electric field What causes it

14869.

How does a point charge can move in a electric field What causes it

Answer»

How does a point charge can move in a electric field

What causes it

Discussion

14870.	Write the truth tablefor circuit given in Fig. 14.47 below consisting of NOR gates andidentify the logic operation (OR, AND, NOT) which this circuit isperforming.(Hint:A = 0, B = 1 then A and B inputs of second NOR gate will be 0 andhence Y=1. Similarly work out the values of Y for other combinationsof A and B. Compare with the truth table of OR, AND, NOT gates andfind the correct one.)
Answer» Write the truth table for circuit given in Fig. 14.47 below consisting of NOR gates and identify the logic operation (OR, AND, NOT) which this circuit is performing. (Hint: A = 0, B = 1 then A and B inputs of second NOR gate will be 0 and hence Y=1. Similarly work out the values of Y for other combinations of A and B. Compare with the truth table of OR, AND, NOT gates and find the correct one.)

14870.

Write the truth tablefor circuit given in Fig. 14.47 below consisting of NOR gates andidentify the logic operation (OR, AND, NOT) which this circuit isperforming.(Hint:A = 0, B = 1 then A and B inputs of second NOR gate will be 0 andhence Y=1. Similarly work out the values of Y for other combinationsof A and B. Compare with the truth table of OR, AND, NOT gates andfind the correct one.)

Answer»

Write the truth table
for circuit given in Fig. 14.47 below consisting of NOR gates and
identify the logic operation (OR, AND, NOT) which this circuit is
performing.

(Hint:
A = 0, B = 1 then A and B inputs of second NOR gate will be 0 and
hence Y=1. Similarly work out the values of Y for other combinations
of A and B. Compare with the truth table of OR, AND, NOT gates and
find the correct one.)

Discussion

14871.	why a cone kept in uniform electric feild line have flux non zero where as hemispherical hollow surface body have zero fl
Answer» why a cone kept in uniform electric feild line have flux non zero where as hemispherical hollow surface body have zero fl

Discussion

14872.	Planet A has mass M and radius R. Planet B has half the mass and half the radius, that of Planet A. If the escape velocities from the Planets A and B are VA and VB, respectively, then vAvB=n4. The value of n is:
Answer» Planet $A$ has mass $M$ and radius $R$ . Planet $B$ has half the mass and half the radius, that of Planet $A$ . If the escape velocities from the Planets $A$ and $B$ are $V_{A}$ and $V_{B}$ , respectively, then $\frac{v_{A}}{v_{B}} = \frac{n}{4}$ . The value of $n$ is:

Discussion

14873.	List - 1 gives different lens configurations. Radius of curvature of each surface is depicted in figure. Refractive index of glass of lens is 32 and medium in which it is placed is 1. Rays of light parallel to axis of lens from left passes through lens and get focussed at distance 'x' from lens. List - 2 gives value of 'x', then correct match is
Answer» List - 1 gives different lens configurations. Radius of curvature of each surface is depicted in figure. Refractive index of glass of lens is $\frac{3}{2}$ and medium in which it is placed is 1. Rays of light parallel to axis of lens from left passes through lens and get focussed at distance 'x' from lens. List - 2 gives value of 'x', then correct match is

Discussion

14874.	If the range of a gun which fires a shell with muzzle speed V is R , then the angle of elevation of the gun is
Answer» If the range of a gun which fires a shell with muzzle speed V is R , then the angle of elevation of the gun is

Discussion

14875.	On a highway, the maximum speed of vehicles is 50 m/s. The material of the road provides a coefficient of static friction μs=0.35. If the highway has a circular turn with a radius of curvature 90 m, then what should be the banking angle (θ) for this turn to ensure safe driving ?
Answer» On a highway, the maximum speed of vehicles is $50 m/s$ . The material of the road provides a coefficient of static friction $μ_{s} = 0.35$ . If the highway has a circular turn with a radius of curvature $90 m$ , then what should be the banking angle $(θ)$ for this turn to ensure safe driving ?

Discussion

14876.	Figure 3.24 gives the x-t plot of a particle in one-dimensional motion. Three different equal intervals of time are shown. In which interval is the average speed greatest, and in which is it the least ? Give the sign of average velocity for each interval.
Answer» Figure 3.24 gives the x-t plot of a particle in one-dimensional motion. Three different equal intervals of time are shown. In which interval is the average speed greatest, and in which is it the least ? Give the sign of average velocity for each interval.

Discussion

14877.	A particle moving along x axis has acceleration f, at time t, given f=a(1-t/T),where a & T are constants. The particle at t=0 has zero velocity. What will be the velocity of particle at f=0?
Answer» A particle moving along x axis has acceleration f, at time t, given f=a(1-t/T),where a & T are constants. The particle at t=0 has zero velocity. What will be the velocity of particle at f=0?

Discussion

14878.	A string tied between x=0 and x=2.45 m vibrates in fundamental mode. The amplitude of vibration is 1 m, tension in the string is 9.8 N and mass per unit length of the string is 1 g. Then, total energy of the string is
Answer» A string tied between $x = 0$ and $x = 2.45 m$ vibrates in fundamental mode. The amplitude of vibration is $1 m$ , tension in the string is $9.8 N$ and mass per unit length of the string is $1 g$ . Then, total energy of the string is

Discussion

14879.	why bakelite has cross polymer chain
Answer» why bakelite has cross polymer chain

Discussion

14880.	Why the zeroth law known so ?
Answer» Why the zeroth law known so ?

Discussion

14881.	A 10 kg iron bar (specific heat 0.11 cal/g∘C) at 80∘ C is placed on a big block of ice at 0∘C. How much ice will it melts?(Take latent heat of fusion as 80 cal/g)
Answer» A $10 kg$ iron bar (specific heat $0.11 {cal/g}^{\circ} C$ ) at $80^{\circ} C$ is placed on a big block of ice at $0^{\circ} C$ . How much ice will it melts? (Take latent heat of fusion as $80 cal/g$ )

Discussion

14882.	Find the contact force between the 3 kg and 2 kg block as shown in the figure.
Answer» Find the contact force between the $3 k g$ and $2 k g$ block as shown in the figure.

Discussion

14883.	Two capacitors of 6 μf and 4 μf are put in series across a 120 V battery. What is the potential difference across the 4 μf capacitor?
Answer» Two capacitors of 6 μf and 4 μf are put in series across a 120 V battery. What is the potential difference across the 4 μf capacitor?

Discussion

14884.	A cylinder of capacity 20 litres is filled with H2 gas. The total average kinetic energy of translatory motion of its molecules is 1.5×105 J. The pressure of hydrogen in the cylinder is
Answer» A cylinder of capacity 20 litres is filled with $H_{2}$ gas. The total average kinetic energy of translatory motion of its molecules is $1.5 \times 10^{5} J$ . The pressure of hydrogen in the cylinder is

Discussion

14885.	A hypothetical screw gauge has a pitch of 0.2 mm and 10 divisions on circular scale. The least count of screw gauge is
Answer» A hypothetical screw gauge has a pitch of $0.2 mm$ and $10$ divisions on circular scale. The least count of screw gauge is

Discussion

14886.	The mass and volume of a body are 4.237 g and 2.5 cm3 respectively. The density of the material of the body in correct significant figures is
Answer» The mass and volume of a body are $4.237 g$ and $2.5 {cm}^{3}$ respectively. The density of the material of the body in correct significant figures is

Discussion

14887.	Three closed vessels A, B and C are at the same temperature T and contains gases which obey the Maxwellian distribution of velocities. Vessel A contains only O2, B only N2 and C a mixture of equal quantities of O2 and N2. If the average speed of the O2 molecules in vessel A is V1, that of the N2 molecules in vessel B is V2, then the average speed of the O2 molecules in vessel C is (where M is the mass of an oxygen molecule)
Answer» Three closed vessels A, B and C are at the same temperature $T$ and contains gases which obey the Maxwellian distribution of velocities. Vessel A contains only $O_{2}$ , B only $N_{2}$ and C a mixture of equal quantities of $O_{2}$ and $N_{2}$ . If the average speed of the $O_{2}$ molecules in vessel A is $V_{1}$ , that of the $N_{2}$ molecules in vessel B is $V_{2}$ , then the average speed of the $O_{2}$ molecules in vessel C is (where $M$ is the mass of an oxygen molecule)

Discussion

14888.	A pipe of diameter 1.8m is required to transport an oil of specific gravity 0.90 and viscosity 4×10−2 poise at a rate of 3m3/sec. Test were conducted on a 18cm diameter pipe using water having viscosity 0.01 poise. The velocity of flow in the model in m/sec. (round off to two decimals) is2.64
Answer» A pipe of diameter $1.8 m$ is required to transport an oil of specific gravity $0.90$ and viscosity $4 \times 10^{- 2}$ poise at a rate of $3 m^{3} / s e c$ . Test were conducted on a $18 c m$ diameter pipe using water having viscosity $0.01$ poise. The velocity of flow in the model in $m / s e c$ . (round off to two decimals) is 2.64

Discussion

14889.	Five balls numbered 1 to 5 are suspended using separate threads. Pairs (1, 2), (2, 4) and (4, 1) show electrostatic attraction, while pair (2, 3) and (4, 5) show repulsion. Therefore ball 1 must be
Answer» Five balls numbered 1 to 5 are suspended using separate threads. Pairs (1, 2), (2, 4) and (4, 1) show electrostatic attraction, while pair (2, 3) and (4, 5) show repulsion. Therefore ball 1 must be

Discussion

14890.	A body is dropped from a height equal to the radius of the Earth, M is the mass of the Earth. R is the radius of the Earth. The velocity of the body on reaching the surface of Earth will be
Answer» A body is dropped from a height equal to the radius of the Earth, M is the mass of the Earth. R is the radius of the Earth. The velocity of the body on reaching the surface of Earth will be

Discussion

14891.	A small pin fixed on a table top is viewed from above from a distanceof 50cm. By what distance would the pin appear to be raised if it isviewed from the same point through a 15cm thick glass slab heldparallel to the table? Refractive index of glass = 1.5. Does the answerdepend on the location of the slab?
Answer» A small pin fixed on a table top is viewed from above from a distanceof 50cm. By what distance would the pin appear to be raised if it isviewed from the same point through a 15cm thick glass slab heldparallel to the table? Refractive index of glass = 1.5. Does the answerdepend on the location of the slab?

Discussion

14892.	Two plane mirrors, a source S of light, emitting monochromatic rays of wavelength λ and a screen are arranged as shown in figure. If angle θ is very small, find the fringe width of the interference pattern formed by reflected rays.
Answer» Two plane mirrors, a source $S$ of light, emitting monochromatic rays of wavelength $λ$ and a screen are arranged as shown in figure. If angle $θ$ is very small, find the fringe width of the interference pattern formed by reflected rays.

Discussion

14893.	The time taken by a vehicle to go from one station to the other is 100 s. It is recorded with a stopwatch having the least count of 1 s. How many significant figures are there in the value of time 100 s?
Answer» The time taken by a vehicle to go from one station to the other is 100 s. It is recorded with a stopwatch having the least count of 1 s. How many significant figures are there in the value of time 100 s?

Discussion

14894.	The range of a voltmeter is 5 volt and its resistance is 5000 Ohm (4900 ohm connected in series with a coil of resistance 100 ohm) what additional resistance should be connected in series with it so that its range is doubled?
Answer» The range of a voltmeter is 5 volt and its resistance is 5000 Ohm (4900 ohm connected in series with a coil of resistance 100 ohm) what additional resistance should be connected in series with it so that its range is doubled?

Discussion

14895.	98.If n1, n2, and n3 are the fundamental frequency of three segment into which a string is divided then the original fundamental frequency n of the sting is?
Answer» 98.If n1, n2, and n3 are the fundamental frequency of three segment into which a string is divided then the original fundamental frequency n of the sting is?

Discussion

14896.	A uniform rod of mass m and length l0 is pivoted at one end and is hanging in the vertical direction. The period of small angular oscillations of the rod is
Answer» A uniform rod of mass $m$ and length $l_{0}$ is pivoted at one end and is hanging in the vertical direction. The period of small angular oscillations of the rod is

Discussion

14897.	a projectile is thrown with an initial velocity (vxi +vyj)m/s . if the range of the projectile is double the naximum height ,then vy/vx
Answer» a projectile is thrown with an initial velocity (vxi +vyj)m/s . if the range of the projectile is double the naximum height ,then vy/vx

Discussion

14898.	what are the preparation of aci
Answer» what are the preparation of aci

Discussion

14899.	32. A particle slides down a smooth inclined plane of elevation 0, fixed in an elevator going up with an accelerationao as shown in figure. The base of the inclined has a length L. Find the time taken by the particle to reach thebottom.aoor is smooth.
Answer» 32. A particle slides down a smooth inclined plane of elevation 0, fixed in an elevator going up with an accelerationao as shown in figure. The base of the inclined has a length L. Find the time taken by the particle to reach thebottom.aoor is smooth.

Discussion

14900.	Magnetic field associated with loop is given by graphs below. [Take anticlockwise current positive]
Answer» Magnetic field associated with loop is given by graphs below. [Take anticlockwise current positive]

Discussion

Explore topic-wise InterviewSolutions in .

A rectangular lamina in the x−y plane is shown below:Density of this lamina is constant along x axis and varies along y axis. If the variation in density is given as ρ(y)=16ρ0y2, then the coordinates of COM will be

A ball is thrown vertically upward from the top of a tower. Velocity at depth h from the point of projection is twice of the velocity at height h above the point of projection. Find the maximum height reached by the ball.

At constant volume, specific heat of ideal gaseous mixture is 116R, then the value of adiabatic constant will be

Between two stations a train starting from rest first accelerates uniformly, then moves with constant velocity and finally retards uniformly to come to rest. If the ratio of the time taken is 1:8:1 and the maximum speed attained is 60km/hr, then what is the average speed over the whole journey?

Find the angle r and r′, if a light ray is incident on surface AB of prism having prism angle 60∘ as shown.

A water treatment plant having flow rate of 600 m3/hr has to remove 80% of the particles having a settling velocity of 0.18 cm/sec. The required plan area of a Type - I settling tank is

Two identical small bodies each of mass m and charge q are suspended from two strings each of length l from a fixed point.This whole system is taken into an orbiting artificial satellite,then find the tension in strings

An ideal gas in a thermally insulated container, at internal pressure P1, volume V1 and absolute temperature T1 expands irreversibly against zero external pressure so that the pressure of gas becomes P2, volume V2 and temperature T2. Which of the following statement(s) is / are incorrect?

A wave of 600 µm wavelength is incident normally on a slit of 1.2 mm width. The value of diffraction angle corresponding to the first minima will be (in radians) -

The edges of a parallelepiped are given by the vectors (2 ^i+3^j+4^k), 4^j and 5^j+m^k. What should be the value of m in order that the volume of the parallelepiped be 24?

what happens if absolute rest is possible?

If →A=2^i+3^j−^k and →B=−^i+3^j+4^k then projection of →A on →B

a double star is composite system of two stars rotating about their centre of mass under their mutual gravitational attraction .let us consider such a double star which has two stars of masss m each at seperation l if T is the time period of rotation about their centres of mass then find T

ntWhat is the potential inside a uniformly charged non conducting sphere?n

If the potential energy of a satellite is −2 MJ, then the binding energy of the satellite is

A tank is filled upto a height H. The horizontal range of water coming out of the hole which is at depth H4 from the surface level of water is

1. A disc having charge Q , radius R is rotating with a constant angular velocity Omega about its own axis . find magnetic field at a distance x from the centre on its axis

How does a point charge can move in a electric field What causes it

why a cone kept in uniform electric feild line have flux non zero where as hemispherical hollow surface body have zero fl

Planet A has mass M and radius R. Planet B has half the mass and half the radius, that of Planet A. If the escape velocities from the Planets A and B are VA and VB, respectively, then vAvB=n4. The value of n is:

If the range of a gun which fires a shell with muzzle speed V is R , then the angle of elevation of the gun is

On a highway, the maximum speed of vehicles is 50 m/s. The material of the road provides a coefficient of static friction μs=0.35. If the highway has a circular turn with a radius of curvature 90 m, then what should be the banking angle (θ) for this turn to ensure safe driving ?

Figure 3.24 gives the x-t plot of a particle in one-dimensional motion. Three different equal intervals of time are shown. In which interval is the average speed greatest, and in which is it the least ? Give the sign of average velocity for each interval.

A particle moving along x axis has acceleration f, at time t, given f=a(1-t/T),where a & T are constants. The particle at t=0 has zero velocity. What will be the velocity of particle at f=0?

A string tied between x=0 and x=2.45 m vibrates in fundamental mode. The amplitude of vibration is 1 m, tension in the string is 9.8 N and mass per unit length of the string is 1 g. Then, total energy of the string is

why bakelite has cross polymer chain

Why the zeroth law known so ?

A 10 kg iron bar (specific heat 0.11 cal/g∘C) at 80∘ C is placed on a big block of ice at 0∘C. How much ice will it melts?(Take latent heat of fusion as 80 cal/g)

Find the contact force between the 3 kg and 2 kg block as shown in the figure.

Two capacitors of 6 μf and 4 μf are put in series across a 120 V battery. What is the potential difference across the 4 μf capacitor?

A cylinder of capacity 20 litres is filled with H2 gas. The total average kinetic energy of translatory motion of its molecules is 1.5×105 J. The pressure of hydrogen in the cylinder is

A hypothetical screw gauge has a pitch of 0.2 mm and 10 divisions on circular scale. The least count of screw gauge is

The mass and volume of a body are 4.237 g and 2.5 cm3 respectively. The density of the material of the body in correct significant figures is

A pipe of diameter 1.8m is required to transport an oil of specific gravity 0.90 and viscosity 4×10−2 poise at a rate of 3m3/sec. Test were conducted on a 18cm diameter pipe using water having viscosity 0.01 poise. The velocity of flow in the model in m/sec. (round off to two decimals) is2.64

Five balls numbered 1 to 5 are suspended using separate threads. Pairs (1, 2), (2, 4) and (4, 1) show electrostatic attraction, while pair (2, 3) and (4, 5) show repulsion. Therefore ball 1 must be

A body is dropped from a height equal to the radius of the Earth, M is the mass of the Earth. R is the radius of the Earth. The velocity of the body on reaching the surface of Earth will be

Two plane mirrors, a source S of light, emitting monochromatic rays of wavelength λ and a screen are arranged as shown in figure. If angle θ is very small, find the fringe width of the interference pattern formed by reflected rays.

The time taken by a vehicle to go from one station to the other is 100 s. It is recorded with a stopwatch having the least count of 1 s. How many significant figures are there in the value of time 100 s?

The range of a voltmeter is 5 volt and its resistance is 5000 Ohm (4900 ohm connected in series with a coil of resistance 100 ohm) what additional resistance should be connected in series with it so that its range is doubled?

98.If n1, n2, and n3 are the fundamental frequency of three segment into which a string is divided then the original fundamental frequency n of the sting is?

A uniform rod of mass m and length l0 is pivoted at one end and is hanging in the vertical direction. The period of small angular oscillations of the rod is

a projectile is thrown with an initial velocity (vxi +vyj)m/s . if the range of the projectile is double the naximum height ,then vy/vx

what are the preparation of aci

32. A particle slides down a smooth inclined plane of elevation 0, fixed in an elevator going up with an accelerationao as shown in figure. The base of the inclined has a length L. Find the time taken by the particle to reach thebottom.aoor is smooth.

Magnetic field associated with loop is given by graphs below. [Take anticlockwise current positive]