50278 + Interview Questions in Physics Page 41 InterviewSolution

2001.	A car has to move on a level turn of radius 45 m. If the coefficient of static friction between the tyre and the road is 2.0, find the maximum speed the car can take without skidding.
Answer» A car has to move on a level turn of radius 45 m. If the coefficient of static friction between the tyre and the road is 2.0, find the maximum speed the car can take without skidding.

Discussion

2002.	A concave lens is always:
Answer» A concave lens is always:

Discussion

2003.	A particle of charge of q and mass m starts moving from the origin under the action of an electric field ¯¯¯¯E=E0^i and ¯¯¯¯B=B0^i with a velocity ¯¯¯v=v0^j. The speed of the particle will become 2v0 after a time
Answer» A particle of charge of $q$ and mass $m$ starts moving from the origin under the action of an electric field $¯ ¯¯ ¯ E = E_{0}^i$ and $¯ ¯¯ ¯ B = B_{0}^i$ with a velocity $¯ ¯ ¯ v = v_{0}^j .$ The speed of the particle will become $2 v_{0}$ after a time

Discussion

2004.	What are the scopes of physics
Answer» What are the scopes of physics

Discussion

2005.	56.Two equal point charges Q are fixed at x= -a and x=+a on x-axis.Another point charge is placed at the origin.The change in electrical potential energy of Q,when it is displaced by a small amount x along x-axis, is approximately proportional to a)x b)x square c)x cube d)1/x
Answer» 56.Two equal point charges Q are fixed at x= -a and x=+a on x-axis.Another point charge is placed at the origin.The change in electrical potential energy of Q,when it is displaced by a small amount x along x-axis, is approximately proportional to a)x b)x square c)x cube d)1/x

Discussion

2006.	The rms value of the electric field of the light coming from the sun is 720 N C−1 The average total energy density of the electromagnetic wave is
Answer» The rms value of the electric field of the light coming from the sun is 720 $N C^{- 1}$ The average total energy density of the electromagnetic wave is

Discussion

2007.

The atomic energy increases when an existing electron is removed from it. This is because work is required to be done to remove an electron. We call these Atomic Energy Levels. The atomic energy levels of a hypothetical atom is given here Ek1000 evEl700 evEm600 evEn550 evIf an electron coming from the cathode (in a Coolidge tube set-up ) has to knock out an electron of L shell of the mentioned hypothetical atom, what should be the minimum accelerating potential of the setup ?

Answer»

The atomic energy increases when an existing electron is removed from it. This is because work is required to be done to remove an electron. We call these Atomic Energy Levels.

The atomic energy levels of a hypothetical atom is given here

Ek	1000 ev
El	700 ev
Em	600 ev
En	550 ev

If an electron coming from the cathode (in a Coolidge tube set-up ) has to knock out an electron of L shell of the mentioned hypothetical atom, what should be the minimum accelerating potential of the setup ?

Discussion

2008.	The figure shows a network of currents. The current i will be
Answer» The figure shows a network of currents. The current $i$ will be

Discussion

2009.	A hot body placed in a surrounding of temperature θ0, obeys Newton's law of cooling dθdt=−k(θ−θ0). Its temperature at t = 0 is θ1. The specific heat capacity of the body is s and its mass is m. Find (a) the maximum heat that the body can lose and (b) the time starting from t=0 in which it will lose 90% of this maximum heat.
Answer» A hot body placed in a surrounding of temperature $θ_{0}$ , obeys Newton's law of cooling $\frac{d θ}{d t} = - k (θ - θ_{0})$ . Its temperature at t = 0 is $θ_{1}$ . The specific heat capacity of the body is s and its mass is m. Find (a) the maximum heat that the body can lose and (b) the time starting from t=0 in which it will lose 90% of this maximum heat.

Discussion

2010.	9.A coil of wire of 1000 turns has self inductance 120 millinery. What is the self inductance of a coil of 250 turns?
Answer» 9.A coil of wire of 1000 turns has self inductance 120 millinery. What is the self inductance of a coil of 250 turns?

Discussion

2011.	Which of these can be a valid graph?
Answer» Which of these can be a valid graph?

Discussion

2012.	Observe the ﬁgure and answer the questions.Sachin and Sameer started on a motorbike from place A, took the turn at B, did a task at C, travelled by the route CD to D and then went on to E. Altogether, they took one hour for this journey. Find out the actual distance traversed by them and the displacement from A to E. From this, deduce their speed. What was their velocity from A to E in the direction AE? Can this velocity be called average velocity?
Answer» Observe the ﬁgure and answer the questions. Sachin and Sameer started on a motorbike from place A, took the turn at B, did a task at C, travelled by the route CD to D and then went on to E. Altogether, they took one hour for this journey. Find out the actual distance traversed by them and the displacement from A to E. From this, deduce their speed. What was their velocity from A to E in the direction AE? Can this velocity be called average velocity?

Discussion

2013.	The position vector of four identical masses of mass 1 kg each are →r1=(^i+2^j+7^k),→r2=(3^i+5^j+^k), →r3=(6^i+2^j+3^k) and →r4=(2^i−^j+5^k). Find the position vector of their centre of mass.
Answer» The position vector of four identical masses of mass $1 kg$ each are $_{1} = (^i + 2^j + 7^k),_{2} = (3^i + 5^j +^k),$ $_{3} = (6^i + 2^j + 3^k)$ and $_{4} = (2^i -^j + 5^k)$ . Find the position vector of their centre of mass.

Discussion

2014.	A player caught a cricket ball of mass 150 g moving at a rate of 20 m/s. If the catching process is completed in 0.1 s, the force of the blow exerted by the ball on the hand of the player is equal to
Answer» A player caught a cricket ball of mass 150 g moving at a rate of 20 m/s. If the catching process is completed in 0.1 s, the force of the blow exerted by the ball on the hand of the player is equal to

Discussion

2015.	A rocket of mass 20 kg has 180 kg fuel. The exhaust velocity of the fuel is 1.6 km/s. Calculate the minimum rate of ejection of fuel so that the rocket may rise from the ground. (Take g=9.8 m/s2)
Answer» A rocket of mass $20 kg$ has $180 kg$ fuel. The exhaust velocity of the fuel is $1.6 km/s$ . Calculate the minimum rate of ejection of fuel so that the rocket may rise from the ground. (Take $g = 9.8 {m/s}^{2}$ )

Discussion

2016.	Work of 3.0×10−4 joule is required to be done in increasing the size of a soap film from 10 cm×6 cm to 10 cm×11 cm. The surface tension of the film is
Answer» Work of $3.0 \times 10^{- 4}$ joule is required to be done in increasing the size of a soap film from $10 c m \times 6 c m$ to $10 c m \times 11 c m$ . The surface tension of the film is

Discussion

2017.	Let →C=→A+→B then
Answer» Let $\to C = \to A + \to B$ then

Discussion

2018.	Two thin metallic spherical shells of radius a and 2a are placed with their centers coinciding. A material of thermal conductivity k is filled in the space between them. Determine the expression for thermal resistance of the system.
Answer» Two thin metallic spherical shells of radius $a$ and $2 a$ are placed with their centers coinciding. A material of thermal conductivity $k$ is filled in the space between them. Determine the expression for thermal resistance of the system.

Discussion

2019.	A particle moves along x−axis in such a way that its x− coordinate varies with time t(in s) according to the equation: x=(6−4t+6t2) m. The velocity of the particle will vary with time according to the graph
Answer» A particle moves along $x -$ axis in such a way that its $x -$ coordinate varies with time $t (in s)$ according to the equation: $x = (6 - 4 t + 6 t^{2}) m$ . The velocity of the particle will vary with time according to the graph

Discussion

2020.	A particle is projected at time t = 0 from a point P with a speed v0 at an angle of 45∘ to the horizontal. Find the magnitude and the direction of the angular momentum of the particle about the point P at time t = v0g
Answer» A particle is projected at time $t$ = 0 from a point $P$ with a speed $v_{0}$ at an angle of $45^{\circ}$ to the horizontal. Find the magnitude and the direction of the angular momentum of the particle about the point $P$ at time $t$ = $\frac{v_{0}}{g}$

Discussion

2021.	Two particles move parallel to x− axis about the origin with the same amplitude and frequency. At a certain instant, they are found at distance A3 from the origin on opposite sides, but their velocities are found to be in the same direction. Find the phase difference between the two particles.
Answer» Two particles move parallel to $x -$ axis about the origin with the same amplitude and frequency. At a certain instant, they are found at distance $\frac{A}{3}$ from the origin on opposite sides, but their velocities are found to be in the same direction. Find the phase difference between the two particles.

Discussion

2022.

Match the following columns. Here, I represent intensity, A amplitude and r distance from the source. Column I Column IIa. I due to point source p. ∝ r−1/2b. A due to point source q. ∝ r−1c. I due to line source r. ∝ r−2d. A due to line source s. ∝ r−4

Answer»

Match the following columns. Here, $I$ represent intensity, $A$ amplitude and $r$ distance from the source.

Column $I$	Column $II$
$a .$ $I$ due to point source	$p .$ $\propto r^{- 1 / 2}$
$b .$ $A$ due to point source	$q .$ $\propto r^{- 1}$
$c .$ $I$ due to line source	$r .$ $\propto r^{- 2}$
$d .$ $A$ due to line source	$s .$ $\propto r^{- 4}$

Discussion

2023.	ntTwo bodies of masses m1 and m2 are connected by a light string which passes over a frictionless, massless pulley. If the pulley is moving upward with uniform acceleration g/2 , then tension in the string will ben ntn ntn
Answer» ntTwo bodies of masses m1 and m2 are connected by a light string which passes over a frictionless, massless pulley. If the pulley is moving upward with uniform acceleration g/2 , then tension in the string will ben ntn ntn

Discussion

2024.	A body of mass m1 is moving with a velocity 'v'. It collides with another stationary body of mass m2. They get embedded. At the point of collision, the velocity of the system is
Answer» A body of mass $m_{1}$ is moving with a velocity 'v'. It collides with another stationary body of mass $m_{2}$ . They get embedded. At the point of collision, the velocity of the system is

Discussion

2025.	Which of the following circuits can be redrawn/identical as the given circuit ?
Answer» Which of the following circuits can be redrawn/identical as the given circuit ?

Discussion

2026.	At t = 0, the shape of a travelling pulse is given by y(x,0)=4×10−38−(x)2 where x and y are in metres. The wave function for the travelling pulse if the velocity of propagation is 5 m/s in the +x direction is given by
Answer» At t = 0, the shape of a travelling pulse is given by $y (x, 0) = \frac{4 \times 10^{- 3}}{8 - (x)^{2}}$ where x and y are in metres. The wave function for the travelling pulse if the velocity of propagation is 5 m/s in the +x direction is given by

Discussion

2027.	Calculate the amount of charge flowing in 2 min in a wire of resistance 10 Ω when a potential difference of 20 V is applied between its ends.
Answer» Calculate the amount of charge flowing in $2 min$ in a wire of resistance $10 Ω$ when a potential difference of $20 V$ is applied between its ends.

Discussion

2028.	A train of mass m moves with a velocity v on the equator from east to west.If ω is the angular speed of earth aboit its axis and R be the radius of earth then find the normal reaction acting on the train
Answer» A train of mass m moves with a velocity v on the equator from east to west.If ω is the angular speed of earth aboit its axis and R be the radius of earth then find the normal reaction acting on the train

Discussion

2029.	Which of the following is used to measure membrane potential?
Answer» Which of the following is used to measure membrane potential?

Discussion

2030.	A transparent solid cylindrical rod has a refractive index of 2√3. It is surrounded by air. A light ray is incident at the mid point of one end of the rod as shown in the figure. The incident angle θ for which the light ray grazes along the wall of the rod is:
Answer» A transparent solid cylindrical rod has a refractive index of $\frac{2}{\sqrt{3}} .$ It is surrounded by air. A light ray is incident at the mid point of one end of the rod as shown in the figure. The incident angle $θ$ for which the light ray grazes along the wall of the rod is:

Discussion

2031.	A tank is filled with water to a height of 12.5 cm. The apparentdepth of a needle lying at the bottom of the tank is measured by amicroscope to be 9.4 cm. What is the refractive index of water? Ifwater is replaced by a liquid of refractive index 1.63 up to the sameheight, by what distance would the microscope have to be moved tofocus on the needle again?
Answer» A tank is filled with water to a height of 12.5 cm. The apparentdepth of a needle lying at the bottom of the tank is measured by amicroscope to be 9.4 cm. What is the refractive index of water? Ifwater is replaced by a liquid of refractive index 1.63 up to the sameheight, by what distance would the microscope have to be moved tofocus on the needle again?

Discussion

2032.	In a pure silicon sample, 1013 atoms of phosphorus are doped per cm3. If all the donor atoms produce carriers and μe=5000 cm2/(volt-sec), then the value of resistivity of the sample is found out to be k×0.25 ohm-m. Then the value of k is
Answer» In a pure silicon sample, $10^{13}$ atoms of phosphorus are doped per $c m^{3}$ . If all the donor atoms produce carriers and $μ_{e} = 5000 {cm}^{2} / (volt-sec)$ , then the value of resistivity of the sample is found out to be $k \times 0.25 ohm-m$ . Then the value of $k$ is

Discussion

2033.	If in the circuit, power dissipation is 150W then R is
Answer» If in the circuit, power dissipation is 150W then R is

Discussion

2034.	Which one is likely to be the orbit number for a circular orbit of diameter 8940.10 pm of the hydroen atom, if we assume Bohr orbit to be the same as that represented by the principal quantum number?
Answer» Which one is likely to be the orbit number for a circular orbit of diameter $8940.10 pm$ of the hydroen atom, if we assume Bohr orbit to be the same as that represented by the principal quantum number?

Discussion

2035.	The conducting shells A AND B are arranged as shown below . if charge on the shell B is q then electric flux linked with the spherical gaussian surface S is
Answer» The conducting shells A AND B are arranged as shown below . if charge on the shell B is q then electric flux linked with the spherical gaussian surface S is

Discussion

2036.	What is the acceleration, if the body starts from the rest and travels a distance of s m in 2 seconds?
Answer» What is the acceleration, if the body starts from the rest and travels a distance of $s m$ in $2$ seconds?

Discussion

2037.	A wide vessel is filled with three immiscible liquids. Their densities are ρ, 2ρ and 3ρ and their depths are h2,h3 and h4 as shown in the figure. A small hole is made in the vessel at a height h6 from its bottom. Find the initial speed with which the liquid comes out through the hole. (Assume area of tank to be much greater than the area of hole)
Answer» A wide vessel is filled with three immiscible liquids. Their densities are ρ, 2ρ and 3ρ and their depths are $\frac{h}{2}$ , $\frac{h}{3}$ and $\frac{h}{4}$ as shown in the figure. A small hole is made in the vessel at a height $\frac{h}{6}$ from its bottom. Find the initial speed with which the liquid comes out through the hole. (Assume area of tank to be much greater than the area of hole)

Discussion

2038.	From the following v2 - s graph. Find the displacement of the particle during the last 2 seconds.
Answer» From the following $v^{2}$ - s graph. Find the displacement of the particle during the last 2 seconds.

2038.

From the following v2 - s graph. Find the displacement of the particle during the last 2 seconds.

Answer»

From the following $v^{2}$ - s graph. Find the displacement of the particle during the last 2 seconds.

Discussion

2039.	Find the resultant of 2 vectors whose magnitude is 6 and 8 and make an angle of 90 degrees between them.
Answer» Find the resultant of 2 vectors whose magnitude is 6 and 8 and make an angle of 90 degrees between them.

Discussion

2040.	An arc lamp requires a direct current of 10 A at 80 V to function. If it is connected to a 220 V (rms), 50 Hz AC supply, the series inductor needed for it to work is close to
Answer» An arc lamp requires a direct current of $10 A$ at $80 V$ to function. If it is connected to a $220 V$ (rms), $50 H z$ AC supply, the series inductor needed for it to work is close to

Discussion

2041.	If a copper wire is stretched to make it 0.1% longer, then the percentage change in its resistance is approximately?
Answer» If a copper wire is stretched to make it 0.1% longer, then the percentage change in its resistance is approximately?

Discussion

2042.	A small sphere starts sliding down on a frictionless hill from point A as shown. What must be the height of the horizontal portion h, to ensure that the sphere covers the maximum horizontal distance s ?
Answer» A small sphere starts sliding down on a frictionless hill from point $A$ as shown. What must be the height of the horizontal portion $h$ , to ensure that the sphere covers the maximum horizontal distance $s$ ?

Discussion

2043.	There are two compartments in a rigid fully insulated tank of 14 m3 volume. First compartment contains 8 m3 of a gas (c = 1 kJ\kgK) at 0.7 MPa and 28∘C and other contain gas (c = 0.7 kJ/kgK) 6 m3 at 1MPa and 840∘C. If the portion between the gas is removed, what is the final temperature of the gas? (Assume ideal gas behaviour)
Answer» There are two compartments in a rigid fully insulated tank of $14 m^{3}$ volume. First compartment contains $8 m^{3}$ of a gas (c = 1 kJ\kgK) at 0.7 MPa and $28^{\circ} C$ and other contain gas (c = 0.7 kJ/kgK) $6 m^{3}$ at 1MPa and $840^{\circ} C$ . If the portion between the gas is removed, what is the final temperature of the gas? (Assume ideal gas behaviour)

Discussion

2044.	A point source S is placed at a distance of 15 cm from a converging lens of focal length 10 cm on its principal axis. Where should a diverging mirror of focal length 12 cm be placed so that a real image is formed on the source itself?
Answer» A point source S is placed at a distance of 15 cm from a converging lens of focal length 10 cm on its principal axis. Where should a diverging mirror of focal length 12 cm be placed so that a real image is formed on the source itself?

Discussion

2045.	the energy in eV possessed by a neon atom at 27^o isa)1.72 \ast×10^{-3 }b)3.88 ×10^{-4}
Answer» the energy in eV possessed by a neon atom at 27^o isa)1.72 \ast×10^{-3 }b)3.88 ×10^{-4}

Discussion

2046.	(4) TemperatureStandard cell voltage for the cell Pb/Pb2 \vert\vert Sn2\ast/Snis-0.01V. If the cell is to exhibit E 0, the valueof log \lbrack Sn2\ast\rbrack\lbrack Pb2\rbrack should becellalv0-0 0-0(1) 0.33(2) 0.53) 1.5(4) -0.5olfonotio
Answer» (4) TemperatureStandard cell voltage for the cell Pb/Pb2 \vert\vert Sn2\ast/Snis-0.01V. If the cell is to exhibit E 0, the valueof log \lbrack Sn2\ast\rbrack\lbrack Pb2\rbrack should becellalv0-0 0-0(1) 0.33(2) 0.53) 1.5(4) -0.5olfonotio

Discussion

2047.	A current carrying loop of radius R and current I is placed in uniform magnetic field B perpendicular to its plane. What is the tension developed in the wire?
Answer» A current carrying loop of radius R and current I is placed in uniform magnetic field B perpendicular to its plane. What is the tension developed in the wire?

Discussion

2048.	A cell E1 of emf 6 V and internal resistance 2 Ω is connected with another cell E2 of emf 4 V and internal resistance 8 Ω as shown in the figure. The potential difference across points X and Y is
Answer» A cell $E_{1}$ of emf $6 V$ and internal resistance $2 Ω$ is connected with another cell $E_{2}$ of emf $4 V$ and internal resistance $8 Ω$ as shown in the figure. The potential difference across points $X$ and $Y$ is

Discussion

2049.	A metre gauge train is moving at a speed of 36 km/hr along a curved track of radius 10√3 m. Find the height of the outer rail with respect to the inner rail, so that there is no side pressure on the rails. Take g=10 m/s2 and the width of the track to be 1 m.
Answer» A metre gauge train is moving at a speed of $36 km/hr$ along a curved track of radius $10 \sqrt{3} m$ . Find the height of the outer rail with respect to the inner rail, so that there is no side pressure on the rails. Take $g = 10 {m/s}^{2}$ and the width of the track to be $1 m$ .

Discussion

2050.

What length of water column is equivalent to 0.86 m of mercury column?Given: density of mercury is 13.6 times the density of water.

Answer»

What length of water column is equivalent to $0.86 m$ of mercury column?

Given: density of mercury is $13.6$ times the density of water.

Discussion

Explore topic-wise InterviewSolutions in .

A car has to move on a level turn of radius 45 m. If the coefficient of static friction between the tyre and the road is 2.0, find the maximum speed the car can take without skidding.

A concave lens is always:

A particle of charge of q and mass m starts moving from the origin under the action of an electric field ¯¯¯¯E=E0^i and ¯¯¯¯B=B0^i with a velocity ¯¯¯v=v0^j. The speed of the particle will become 2v0 after a time

What are the scopes of physics

56.Two equal point charges Q are fixed at x= -a and x=+a on x-axis.Another point charge is placed at the origin.The change in electrical potential energy of Q,when it is displaced by a small amount x along x-axis, is approximately proportional to a)x b)x square c)x cube d)1/x

The rms value of the electric field of the light coming from the sun is 720 N C−1 The average total energy density of the electromagnetic wave is

The figure shows a network of currents. The current i will be

9.A coil of wire of 1000 turns has self inductance 120 millinery. What is the self inductance of a coil of 250 turns?

Which of these can be a valid graph?

The position vector of four identical masses of mass 1 kg each are →r1=(^i+2^j+7^k),→r2=(3^i+5^j+^k), →r3=(6^i+2^j+3^k) and →r4=(2^i−^j+5^k). Find the position vector of their centre of mass.

A player caught a cricket ball of mass 150 g moving at a rate of 20 m/s. If the catching process is completed in 0.1 s, the force of the blow exerted by the ball on the hand of the player is equal to

A rocket of mass 20 kg has 180 kg fuel. The exhaust velocity of the fuel is 1.6 km/s. Calculate the minimum rate of ejection of fuel so that the rocket may rise from the ground. (Take g=9.8 m/s2)

Work of 3.0×10−4 joule is required to be done in increasing the size of a soap film from 10 cm×6 cm to 10 cm×11 cm. The surface tension of the film is

Let →C=→A+→B then

Two thin metallic spherical shells of radius a and 2a are placed with their centers coinciding. A material of thermal conductivity k is filled in the space between them. Determine the expression for thermal resistance of the system.

A particle moves along x−axis in such a way that its x− coordinate varies with time t(in s) according to the equation: x=(6−4t+6t2) m. The velocity of the particle will vary with time according to the graph

A particle is projected at time t = 0 from a point P with a speed v0 at an angle of 45∘ to the horizontal. Find the magnitude and the direction of the angular momentum of the particle about the point P at time t = v0g

Two particles move parallel to x− axis about the origin with the same amplitude and frequency. At a certain instant, they are found at distance A3 from the origin on opposite sides, but their velocities are found to be in the same direction. Find the phase difference between the two particles.

Match the following columns. Here, I represent intensity, A amplitude and r distance from the source. Column I Column IIa. I due to point source p. ∝ r−1/2b. A due to point source q. ∝ r−1c. I due to line source r. ∝ r−2d. A due to line source s. ∝ r−4

ntTwo bodies of masses m1 and m2 are connected by a light string which passes over a frictionless, massless pulley. If the pulley is moving upward with uniform acceleration g/2 , then tension in the string will ben ntn ntn

A body of mass m1 is moving with a velocity 'v'. It collides with another stationary body of mass m2. They get embedded. At the point of collision, the velocity of the system is

Which of the following circuits can be redrawn/identical as the given circuit ?

At t = 0, the shape of a travelling pulse is given by y(x,0)=4×10−38−(x)2 where x and y are in metres. The wave function for the travelling pulse if the velocity of propagation is 5 m/s in the +x direction is given by

Calculate the amount of charge flowing in 2 min in a wire of resistance 10 Ω when a potential difference of 20 V is applied between its ends.

A train of mass m moves with a velocity v on the equator from east to west.If ω is the angular speed of earth aboit its axis and R be the radius of earth then find the normal reaction acting on the train

Which of the following is used to measure membrane potential?

A transparent solid cylindrical rod has a refractive index of 2√3. It is surrounded by air. A light ray is incident at the mid point of one end of the rod as shown in the figure. The incident angle θ for which the light ray grazes along the wall of the rod is:

In a pure silicon sample, 1013 atoms of phosphorus are doped per cm3. If all the donor atoms produce carriers and μe=5000 cm2/(volt-sec), then the value of resistivity of the sample is found out to be k×0.25 ohm-m. Then the value of k is

If in the circuit, power dissipation is 150W then R is

Which one is likely to be the orbit number for a circular orbit of diameter 8940.10 pm of the hydroen atom, if we assume Bohr orbit to be the same as that represented by the principal quantum number?

The conducting shells A AND B are arranged as shown below . if charge on the shell B is q then electric flux linked with the spherical gaussian surface S is

What is the acceleration, if the body starts from the rest and travels a distance of s m in 2 seconds?

From the following v2 - s graph. Find the displacement of the particle during the last 2 seconds.

Find the resultant of 2 vectors whose magnitude is 6 and 8 and make an angle of 90 degrees between them.

An arc lamp requires a direct current of 10 A at 80 V to function. If it is connected to a 220 V (rms), 50 Hz AC supply, the series inductor needed for it to work is close to

If a copper wire is stretched to make it 0.1% longer, then the percentage change in its resistance is approximately?

A small sphere starts sliding down on a frictionless hill from point A as shown. What must be the height of the horizontal portion h, to ensure that the sphere covers the maximum horizontal distance s ?

A point source S is placed at a distance of 15 cm from a converging lens of focal length 10 cm on its principal axis. Where should a diverging mirror of focal length 12 cm be placed so that a real image is formed on the source itself?

the energy in eV possessed by a neon atom at 27^o isa)1.72 \ast×10^{-3 }b)3.88 ×10^{-4}

(4) TemperatureStandard cell voltage for the cell Pb/Pb2 \vert\vert Sn2\ast/Snis-0.01V. If the cell is to exhibit E 0, the valueof log \lbrack Sn2\ast\rbrack\lbrack Pb2\rbrack should becellalv0-0 0-0(1) 0.33(2) 0.53) 1.5(4) -0.5olfonotio

A current carrying loop of radius R and current I is placed in uniform magnetic field B perpendicular to its plane. What is the tension developed in the wire?

A cell E1 of emf 6 V and internal resistance 2 Ω is connected with another cell E2 of emf 4 V and internal resistance 8 Ω as shown in the figure. The potential difference across points X and Y is

A metre gauge train is moving at a speed of 36 km/hr along a curved track of radius 10√3 m. Find the height of the outer rail with respect to the inner rail, so that there is no side pressure on the rails. Take g=10 m/s2 and the width of the track to be 1 m.

What length of water column is equivalent to 0.86 m of mercury column?Given: density of mercury is 13.6 times the density of water.