50278 + Interview Questions in Physics Page 267 InterviewSolution

13301.	If an alpha particle and a proton are accelerated from rest by a potential difference of 1 megavolt, then the ratio of their kinetic energy will b
Answer» If an alpha particle and a proton are accelerated from rest by a potential difference of 1 megavolt, then the ratio of their kinetic energy will b

Discussion

13302.	Two water pipes P and Q having diameter 2/100 m and 4/100 m respectively with the main supply of water. the velocity of water flowing through the pipe P is
Answer» Two water pipes P and Q having diameter 2/100 m and 4/100 m respectively with the main supply of water. the velocity of water flowing through the pipe P is

Discussion

13303.	The plates S and T of an uncharged parallel plates capacitor are connected across a battery. The battery is then disconnected and the charged plates are now connected in a system as shown in the figure. The system shown is in equilibrium. All the strings are insulating and massless. The magnitude of charge on one of the capacitor plates is pC.
Answer» The plates $S$ and $T$ of an uncharged parallel plates capacitor are connected across a battery. The battery is then disconnected and the charged plates are now connected in a system as shown in the figure. The system shown is in equilibrium. All the strings are insulating and massless. The magnitude of charge on one of the capacitor plates is $pC$ .

Discussion

13304.	Figure depicts the motion of a particle moving along an x axis with a constant acceleration. The figure's vertical scaling is set by xs = 6.0 m. What is the particle's acceleration?
Answer» Figure depicts the motion of a particle moving along an x axis with a constant acceleration. The figure's vertical scaling is set by $x_{s}$ = 6.0 m. What is the particle's acceleration?

13304.

Figure depicts the motion of a particle moving along an x axis with a constant acceleration. The figure's vertical scaling is set by xs = 6.0 m. What is the particle's acceleration?

Answer»

Figure depicts the motion of a particle moving along an x axis with a constant acceleration. The figure's vertical scaling is set by $x_{s}$ = 6.0 m. What is the particle's acceleration?

Discussion

13305.	In a snooker match ball A is hit and it is moving with speed 4 m/s in the x-direction. It goes and hits balls B and C such that after collision ball B moves with velocity 4 m/s at angle ∘60 to x-direction and A comes to rest. Find the velocity of ball C?
Answer» In a snooker match ball A is hit and it is moving with speed 4 m/s in the x-direction. It goes and hits balls B and C such that after collision ball B moves with velocity 4 m/s at angle $\circ 60$ to x-direction and A comes to rest. Find the velocity of ball C?

13305.

In a snooker match ball A is hit and it is moving with speed 4 m/s in the x-direction. It goes and hits balls B and C such that after collision ball B moves with velocity 4 m/s at angle ∘60 to x-direction and A comes to rest. Find the velocity of ball C?

Answer»

In a snooker match ball A is hit and it is moving with speed 4 m/s in the x-direction. It goes and hits balls B and C such that after collision ball B moves with velocity 4 m/s at angle $\circ 60$ to x-direction and A comes to rest. Find the velocity of ball C?

Discussion

13306.	A block of mass m is hung from a disc shaped pulley of mass M and radius R as shown in the figure. If M=4m, then the acceleration of the block just after the system is released from rest is -
Answer» A block of mass $m$ is hung from a disc shaped pulley of mass $M$ and radius $R$ as shown in the figure. If $M = 4 m$ , then the acceleration of the block just after the system is released from rest is -

Discussion

13307.	A block of mass 100 g attached to a spring of spring constant 100 N/m. The block is moved to compress the spring by 10 cm and then released on a frictionless floor as shown below. If the collisions with the wall in the front are elastic in nature, then the time period of the motion is
Answer» A block of mass $100 g$ attached to a spring of spring constant $100 N/m$ . The block is moved to compress the spring by $10 cm$ and then released on a frictionless floor as shown below. If the collisions with the wall in the front are elastic in nature, then the time period of the motion is

Discussion

13308.	A sphere is rolling without slipping with velocity V, on a thin plank moving with 3V, as showin figure. Find distance of instantanous axis of rotation from centre of sphere. velocity of cm sphere is towards right abd velocity of plank is towards le
Answer» A sphere is rolling without slipping with velocity V, on a thin plank moving with 3V, as showin figure. Find distance of instantanous axis of rotation from centre of sphere. velocity of cm sphere is towards right abd velocity of plank is towards le

Discussion

13309.	A bullet of mass 5 g moving at a speed of 200 m/s strikes a rigidly fixed wooden plank of thickness 0.2 m normally and passes through it losing half of its kinetic energy. If it again strikes an identical rigidly fixed wooden plank and passes through it, assuming the same resistance in the two planks, the ration of the thermal energies produced in the two planks is
Answer» A bullet of mass 5 g moving at a speed of 200 m/s strikes a rigidly fixed wooden plank of thickness 0.2 m normally and passes through it losing half of its kinetic energy. If it again strikes an identical rigidly fixed wooden plank and passes through it, assuming the same resistance in the two planks, the ration of the thermal energies produced in the two planks is

Discussion

13310.	A sphere of mass M and diameter D is heated by temperature ΔT. If coefficient of linear expansion is α, then find the change in the surface area of sphere.
Answer» A sphere of mass $M$ and diameter $D$ is heated by temperature $Δ T$ . If coefficient of linear expansion is $α$ , then find the change in the surface area of sphere.

Discussion

13311.	A particle is thrown upwards from ground. it experiences a constant resistance force which can produce retardation of 2m/s^2. The ratio of time of ascent to time of descent is.[g=10m/s^2]
Answer» A particle is thrown upwards from ground. it experiences a constant resistance force which can produce retardation of 2m/s^2. The ratio of time of ascent to time of descent is.[g=10m/s^2]

Discussion

13312.	If a non ideal cell of emf E and internal resistance r is being discharged, then the terminal voltage (V) across the cell will be
Answer» If a non ideal cell of emf $E$ and internal resistance $r$ is being discharged, then the terminal voltage $(V)$ across the cell will be

Discussion

13313.	an object after travelling in uniform motion for some time , takes a U turn,and traces back its path,with the same constant speed but in opposite direction,will the total motin b uniform motion(bcz we said uniform motion is equal distances(and not displacement) in equal time intervals)
Answer» an object after travelling in uniform motion for some time , takes a U turn,and traces back its path,with the same constant speed but in opposite direction,will the total motin b uniform motion(bcz we said uniform motion is equal distances(and not displacement) in equal time intervals)

Discussion

13314.	Find energy of each ofthe photons which(i) correspondto light of frequency 3× 1015Hz.(ii) have wavelength of0.50 Å.
Answer» Find energy of each of the photons which (i) correspond to light of frequency 3× 10¹⁵Hz. (ii) have wavelength of 0.50 Å.

13314.

Find energy of each ofthe photons which(i) correspondto light of frequency 3× 1015Hz.(ii) have wavelength of0.50 Å.

Answer»

Find energy of each of
the photons which

(i) correspond
to light of frequency 3× 10¹⁵Hz.

(ii) have wavelength of
0.50 Å.

Discussion

13315.	A parallel plate capacitor has a uniform electric field →E in the space between the plates. If the distance between the plates is d and the area of each plateis A, the energy stored in the capacitor is(ε0= permittivity of free space)
Answer» A parallel plate capacitor has a uniform electric field $\to E$ in the space between the plates. If the distance between the plates is $d$ and the area of each plate is $A,$ the energy stored in the capacitor is ( $ε_{0} =$ permittivity of free space)

Discussion

13316.	A mixture of liquid showing positive deviation in Raoult's law is
Answer» A mixture of liquid showing positive deviation in Raoult's law is

13316.

A mixture of liquid showing positive deviation in Raoult's law is

Answer»

A mixture of liquid showing positive deviation in Raoult's law is

Discussion

13317.	what kind of image is formed when light rays parallel to the principal axis of a convex lens falls on it
Answer» what kind of image is formed when light rays parallel to the principal axis of a convex lens falls on it

Discussion

13318.	CosAcos2Acos4A......cos2n−1 A equals
Answer» CosAcos2Acos4A...... $c o s 2^{n - 1}$ A equals

Discussion

13319.	A 25 cm long solenoid has radius 2 cm and 500 total number of turns. It carries a current of 15 A. If it is equivalent to magnet of the same size and magnetization −→M, then \|−→M\| is:
Answer» A $25 cm$ long solenoid has radius $2 cm$ and $500$ total number of turns. It carries a current of $15 A$ . If it is equivalent to magnet of the same size and magnetization $- \to M$ , then $\| - \to M \|$ is:

Discussion

13320.	When the temperature of an ideal gas is increased by 600 K, the speed of sound in it become √3 times the initial speed. The initial temperature of the gas is
Answer» When the temperature of an ideal gas is increased by $600 K$ , the speed of sound in it become $\sqrt{3}$ times the initial speed. The initial temperature of the gas is

Discussion

13321.	a 70 kg man s†an ds in contact against the inner lining of a hollow cylindrical drum of radius 3m rotating about its vertical axis with 200 rev/min.the coefficient of friction between the wall and his clothing is 0.15.what is the minimum rotational speed of the cylinder to enable the man to remain stuck to the wall(without falling) when the floor is suddenly removed?
Answer» a 70 kg man s†an ds in contact against the inner lining of a hollow cylindrical drum of radius 3m rotating about its vertical axis with 200 rev/min.the coefficient of friction between the wall and his clothing is 0.15.what is the minimum rotational speed of the cylinder to enable the man to remain stuck to the wall(without falling) when the floor is suddenly removed?

Discussion

13322.	If a charged particle of charge to mass ratioqm=α is entering in a uniform magnetic field of strength B which is extended up to 4d as shown in figure at a speed v=(2αdB)If the radius of the circular path described in the magnetic field is nd, find value of n.
Answer» If a charged particle of charge to mass ratio $\frac{q}{m} = α$ is entering in a uniform magnetic field of strength $B$ which is extended up to $4 d$ as shown in figure at a speed $v = (2 α d B)$ If the radius of the circular path described in the magnetic field is $n d$ , find value of $n$ .

Discussion

13323.	Find the displacement amplitude of particles of air of density 1.5 kg/m3 if the intensity and frequency of sound are 8×10−6 W/m2 and 5000 Hz respectively. [speed of sound in air =330 m/s]
Answer» Find the displacement amplitude of particles of air of density $1.5 {kg/m}^{3}$ if the intensity and frequency of sound are $8 \times 10^{- 6} {W/m}^{2}$ and $5000 Hz$ respectively. [speed of sound in air $= 330 m/s$ ]

Discussion

13324.	Which of the following is false about the gravitational field?
Answer» Which of the following is false about the gravitational field?

Discussion

13325.	Find the value of the trigonometric function cosec (–1410°)
Answer» Find the value of the trigonometric function cosec (–1410°)

Discussion

13326.	A 30 V, 90 W lamp is to be operated on a 120 V DC lines. For proper glow, how much resistance (in 2) should be connected in series with the lamp?
Answer» A 30 V, 90 W lamp is to be operated on a 120 V DC lines. For proper glow, how much resistance (in 2) should be connected in series with the lamp?

Discussion

13327.

An X-rays tube operates at 20 kV. A particular electron loses 5% of its kinetic energy to emit an X-rays photon at the first collision. The wavelength corresponding to this photon will be :- (1) 1.24 nm (2) 2.24 nm (3) 3.5 nm (4) zero

Answer»

An X-rays tube operates at 20 kV. A particular electron loses 5% of its kinetic energy to emit an X-rays photon at the first collision. The wavelength corresponding to this photon will be :-

(1)	1.24 nm
(2)	2.24 nm
(3)	3.5 nm
(4)	zero

Discussion

13328.	A unit vector along a bisector of the angle between the two vectors ^i−2^j+2^k and 4^j+3^k is/are
Answer» A unit vector along a bisector of the angle between the two vectors $^i - 2^j + 2^k$ and $4^j + 3^k$ is/are

Discussion

13329.	A circular wire loop of radius R is placed inthe x -y plane centered at the origin O . A square loop of side a(a
Answer» A circular wire loop of radius R is placed in the x -y plane centered at the origin O . A square loop of side a(a $z = \sqrt 3 R along the axis of the circular wire loop, as shown in figure. The plane of the square loop makes an angle of 45^{0} with respect to the z -axis. If the mutual inductance between the loops is given by \frac{μ_{0} a^{2}}{2^{\frac{P}{2}} R}, then the value of p is$

Discussion

13330.	A steel scale measuresthe length of a copper wire as 80.0 cm when both are at 20∘C (the calibration temperature for scale). What would be the scale read for the length of the wire when both are at 40C ? (Given αsteel=11×10−6 per0 C and αcopper=17×10−6 per 0C)
Answer» A steel scale measuresthe length of a copper wire as 80.0 cm when both are at $20^{\circ} C$ (the calibration temperature for scale). What would be the scale read for the length of the wire when both are at 40C ? $(G i v e n α_{s t e e l} = 11 \times 10 - 6 p e r^{0} C a n d α_{c o p p e r} = 17 \times 10^{- 6} p e r^{0} C)$

Discussion

13331.	The ball goes upto a height of .
Answer» The ball goes upto a height of .

Discussion

13332.	A shell is fired vertically upwards with a velocity V1 from a trolly moving horizontally with a velocity V2. The motion of the sgell is a parabola with what range??
Answer» A shell is fired vertically upwards with a velocity V1 from a trolly moving horizontally with a velocity V2. The motion of the sgell is a parabola with what range??

Discussion

13333.	As shown in the figure, two masses 6 kg and 4 kg respectively are tied to the ends of a string which passes over a light frictionless pulley. Initially, the masses are at rest and are at the same horizontal level. Now, they are released. Find the distance travelled by their center of mass in 10 s.
Answer» As shown in the figure, two masses $6 kg$ and $4 kg$ respectively are tied to the ends of a string which passes over a light frictionless pulley. Initially, the masses are at rest and are at the same horizontal level. Now, they are released. Find the distance travelled by their center of mass in $10 s$ .

Discussion

13334.	40. The electric current is produced in an electrochemical cell having the following cell reaction Fe + Cu+2. Reversible Fe+2. + Cu If 0.85 faraday electricity is obtained from this standard cell what maximum work can be done? The value of the standard cell potential is 0.78volt.??
Answer» 40. The electric current is produced in an electrochemical cell having the following cell reaction Fe + Cu+2. Reversible Fe+2. + Cu If 0.85 faraday electricity is obtained from this standard cell what maximum work can be done? The value of the standard cell potential is 0.78volt.??

Discussion

13335.	In a potentiometer of one metre length, an unknown emf voltage source is balanced at 60 cm length of potentiometer wire, while a 3 V battery is balanced at 45 cm length. Then, the emf of the unknown voltage source is:
Answer» In a potentiometer of one metre length, an unknown emf voltage source is balanced at $60 c m$ length of potentiometer wire, while a $3 V$ battery is balanced at $45 c m$ length. Then, the emf of the unknown voltage source is:

Discussion

13336.	Write an article of about 1000 words explaining the kinematics of uniform and non-uniform circular motion. Also, explain how it finds application in banking of roads.
Answer» Write an article of about 1000 words explaining the kinematics of uniform and non-uniform circular motion. Also, explain how it finds application in banking of roads.

Discussion

13337.	Two blocks A and B each of mass 1kg placed on a smooth horizontal surface.Two horizontal forces 5 N and 10 N are applied on them respectively. The block A does not slide on block B.Then the normal reaction between the two block is:
Answer» Two blocks A and B each of mass 1kg placed on a smooth horizontal surface.Two horizontal forces 5 N and 10 N are applied on them respectively. The block A does not slide on block B.Then the normal reaction between the two block is:

Discussion

13338.	The deflection produced in the galvanometer is reduced to 45 divisions from 55 when a shunt of 8 ohm is used. Calculate the resistance of the galvanometer.
Answer» The deflection produced in the galvanometer is reduced to 45 divisions from 55 when a shunt of 8 ohm is used. Calculate the resistance of the galvanometer.

Discussion

13339.	a resis†an ce R of thermal coefficient of resistivity α is connected in parallel with resis†an ce 3R having thermal coefficient of resistivity 2α, the equivalent thermal coefficient of resistivity i
Answer» a resis†an ce R of thermal coefficient of resistivity α is connected in parallel with resis†an ce 3R having thermal coefficient of resistivity 2α, the equivalent thermal coefficient of resistivity i

Discussion

13340.	What is the difference between kinetic energy and potential energy? Explain in detail with their respective derivation.
Answer» What is the difference between kinetic energy and potential energy? Explain in detail with their respective derivation.

Discussion

13341.	44.If three resistors are connected in parallel, at what ratio will electric current flow through them?
Answer» 44.If three resistors are connected in parallel, at what ratio will electric current flow through them?

Discussion

13342.	If a simple pendulum oscillates with an amplitude of 50 mm and time period of 2 seconds, then its maximum velocity is
Answer» If a simple pendulum oscillates with an amplitude of $50 mm$ and time period of $2 seconds$ , then its maximum velocity is

Discussion

13343.	One mole of an ideal monoatomic gas is initially at 500 K. If 300 J of heat is added at constant volume, the final temperature of the gas is(Assume R=8 J/mol K)
Answer» One $mole$ of an ideal monoatomic gas is initially at $500 K$ . If $300 J$ of heat is added at constant volume, the final temperature of the gas is (Assume $R = 8 J/mol K$ )

Discussion

13344.	A body of mass 1 kg is moving with a velocity →v=(10^i+5^j) m/s. What is the angle made by the momentum vector with x-axis?
Answer» A body of mass $1 k g$ is moving with a velocity $\to v = (10^i + 5^j) m / s .$ What is the angle made by the momentum vector with x-axis?

Discussion

13345.	If specific heat of a metal is 0.64cal g^-1 K^-1, then find the approximate and exact atomic mass of the metal assuming the equivalent mass of metal to be 2.75.
Answer» If specific heat of a metal is 0.64cal g^-1 K^-1, then find the approximate and exact atomic mass of the metal assuming the equivalent mass of metal to be 2.75.

Discussion

13346.	7.Calculate the work to be done to displace an electron which is at distance of 5cm froma charge of 20uC to a distance 10cm
Answer» 7.Calculate the work to be done to displace an electron which is at distance of 5cm froma charge of 20uC to a distance 10cm

Discussion

13347.	A silver wire has aresistance of 2.1 Ω at27.5 °C, and a resistance of 2.7 Ω at100 °C. Determine the temperature coefficient of resistivity ofsilver.
Answer» A silver wire has a resistance of 2.1 Ω at 27.5 °C, and a resistance of 2.7 Ω at 100 °C. Determine the temperature coefficient of resistivity of silver.

Discussion

13348.	A ray of green light enters a liquid from air, as shown in Fig. 4.21. The angle 1 is 45∘ and angle 2 is 30∘.(a) Find the refractive index of the liquid.(b) Show in the diagram the path of the ray after it strikes the mirror and re-enters in the air. Mark in the diagram the angles wherever necessary.(c) Redraw the diagram if the plane mirror becomes normal to the refracted ray inside the liquid. State the principle used.
Answer» A ray of green light enters a liquid from air, as shown in Fig. 4.21. The angle 1 is $45^{\circ}$ and angle 2 is $30^{\circ}$ . (a) Find the refractive index of the liquid. (b) Show in the diagram the path of the ray after it strikes the mirror and re-enters in the air. Mark in the diagram the angles wherever necessary. (c) Redraw the diagram if the plane mirror becomes normal to the refracted ray inside the liquid. State the principle used.

Discussion

13349.	The storage battery of a car has an emf of 12 V. If the internalresistance of the battery is 0.4 W, what is the maximum currentthat can be drawn from the battery?
Answer» The storage battery of a car has an emf of 12 V. If the internalresistance of the battery is 0.4 W, what is the maximum currentthat can be drawn from the battery?

Discussion

13350.	A rubber ball of mass 10 g and volume 15 cm3 is dipped in water to a depth of 10 m. Assuming density of water to be uniform throughout the depth, the time taken by it to reach the surface in seconds is (take g=10ms−2)
Answer» A rubber ball of mass $10 g$ and volume $15 c m^{3}$ is dipped in water to a depth of $10 m$ . Assuming density of water to be uniform throughout the depth, the time taken by it to reach the surface in seconds is (take $g = 10 m s^{- 2})$

Discussion

Explore topic-wise InterviewSolutions in .

If an alpha particle and a proton are accelerated from rest by a potential difference of 1 megavolt, then the ratio of their kinetic energy will b

Two water pipes P and Q having diameter 2/100 m and 4/100 m respectively with the main supply of water. the velocity of water flowing through the pipe P is

Figure depicts the motion of a particle moving along an x axis with a constant acceleration. The figure's vertical scaling is set by xs = 6.0 m. What is the particle's acceleration?

In a snooker match ball A is hit and it is moving with speed 4 m/s in the x-direction. It goes and hits balls B and C such that after collision ball B moves with velocity 4 m/s at angle ∘60 to x-direction and A comes to rest. Find the velocity of ball C?

A block of mass m is hung from a disc shaped pulley of mass M and radius R as shown in the figure. If M=4m, then the acceleration of the block just after the system is released from rest is -

A block of mass 100 g attached to a spring of spring constant 100 N/m. The block is moved to compress the spring by 10 cm and then released on a frictionless floor as shown below. If the collisions with the wall in the front are elastic in nature, then the time period of the motion is

A sphere is rolling without slipping with velocity V, on a thin plank moving with 3V, as showin figure. Find distance of instantanous axis of rotation from centre of sphere. velocity of cm sphere is towards right abd velocity of plank is towards le

A sphere of mass M and diameter D is heated by temperature ΔT. If coefficient of linear expansion is α, then find the change in the surface area of sphere.

A particle is thrown upwards from ground. it experiences a constant resistance force which can produce retardation of 2m/s^2. The ratio of time of ascent to time of descent is.[g=10m/s^2]

If a non ideal cell of emf E and internal resistance r is being discharged, then the terminal voltage (V) across the cell will be

an object after travelling in uniform motion for some time , takes a U turn,and traces back its path,with the same constant speed but in opposite direction,will the total motin b uniform motion(bcz we said uniform motion is equal distances(and not displacement) in equal time intervals)

Find energy of each ofthe photons which(i) correspondto light of frequency 3× 1015Hz.(ii) have wavelength of0.50 Å.

A parallel plate capacitor has a uniform electric field →E in the space between the plates. If the distance between the plates is d and the area of each plateis A, the energy stored in the capacitor is(ε0= permittivity of free space)

A mixture of liquid showing positive deviation in Raoult's law is

what kind of image is formed when light rays parallel to the principal axis of a convex lens falls on it

CosAcos2Acos4A......cos2n−1 A equals

A 25 cm long solenoid has radius 2 cm and 500 total number of turns. It carries a current of 15 A. If it is equivalent to magnet of the same size and magnetization −→M, then |−→M| is:

When the temperature of an ideal gas is increased by 600 K, the speed of sound in it become √3 times the initial speed. The initial temperature of the gas is

If a charged particle of charge to mass ratioqm=α is entering in a uniform magnetic field of strength B which is extended up to 4d as shown in figure at a speed v=(2αdB)If the radius of the circular path described in the magnetic field is nd, find value of n.

Find the displacement amplitude of particles of air of density 1.5 kg/m3 if the intensity and frequency of sound are 8×10−6 W/m2 and 5000 Hz respectively. [speed of sound in air =330 m/s]

Which of the following is false about the gravitational field?

Find the value of the trigonometric function cosec (–1410°)

A 30 V, 90 W lamp is to be operated on a 120 V DC lines. For proper glow, how much resistance (in 2) should be connected in series with the lamp?

An X-rays tube operates at 20 kV. A particular electron loses 5% of its kinetic energy to emit an X-rays photon at the first collision. The wavelength corresponding to this photon will be :- (1) 1.24 nm (2) 2.24 nm (3) 3.5 nm (4) zero

A unit vector along a bisector of the angle between the two vectors ^i−2^j+2^k and 4^j+3^k is/are

A circular wire loop of radius R is placed inthe x -y plane centered at the origin O . A square loop of side a(a

A steel scale measuresthe length of a copper wire as 80.0 cm when both are at 20∘C (the calibration temperature for scale). What would be the scale read for the length of the wire when both are at 40C ? (Given αsteel=11×10−6 per0 C and αcopper=17×10−6 per 0C)

The ball goes upto a height of .

A shell is fired vertically upwards with a velocity V1 from a trolly moving horizontally with a velocity V2. The motion of the sgell is a parabola with what range??

As shown in the figure, two masses 6 kg and 4 kg respectively are tied to the ends of a string which passes over a light frictionless pulley. Initially, the masses are at rest and are at the same horizontal level. Now, they are released. Find the distance travelled by their center of mass in 10 s.

40. The electric current is produced in an electrochemical cell having the following cell reaction Fe + Cu+2. Reversible Fe+2. + Cu If 0.85 faraday electricity is obtained from this standard cell what maximum work can be done? The value of the standard cell potential is 0.78volt.??

In a potentiometer of one metre length, an unknown emf voltage source is balanced at 60 cm length of potentiometer wire, while a 3 V battery is balanced at 45 cm length. Then, the emf of the unknown voltage source is:

Write an article of about 1000 words explaining the kinematics of uniform and non-uniform circular motion. Also, explain how it finds application in banking of roads.

Two blocks A and B each of mass 1kg placed on a smooth horizontal surface.Two horizontal forces 5 N and 10 N are applied on them respectively. The block A does not slide on block B.Then the normal reaction between the two block is:

The deflection produced in the galvanometer is reduced to 45 divisions from 55 when a shunt of 8 ohm is used. Calculate the resistance of the galvanometer.

a resis†an ce R of thermal coefficient of resistivity α is connected in parallel with resis†an ce 3R having thermal coefficient of resistivity 2α, the equivalent thermal coefficient of resistivity i

What is the difference between kinetic energy and potential energy? Explain in detail with their respective derivation.

44.If three resistors are connected in parallel, at what ratio will electric current flow through them?

If a simple pendulum oscillates with an amplitude of 50 mm and time period of 2 seconds, then its maximum velocity is

One mole of an ideal monoatomic gas is initially at 500 K. If 300 J of heat is added at constant volume, the final temperature of the gas is(Assume R=8 J/mol K)

A body of mass 1 kg is moving with a velocity →v=(10^i+5^j) m/s. What is the angle made by the momentum vector with x-axis?

If specific heat of a metal is 0.64cal g^-1 K^-1, then find the approximate and exact atomic mass of the metal assuming the equivalent mass of metal to be 2.75.

7.Calculate the work to be done to displace an electron which is at distance of 5cm froma charge of 20uC to a distance 10cm

A silver wire has aresistance of 2.1 Ω at27.5 °C, and a resistance of 2.7 Ω at100 °C. Determine the temperature coefficient of resistivity ofsilver.

The storage battery of a car has an emf of 12 V. If the internalresistance of the battery is 0.4 W, what is the maximum currentthat can be drawn from the battery?

A rubber ball of mass 10 g and volume 15 cm3 is dipped in water to a depth of 10 m. Assuming density of water to be uniform throughout the depth, the time taken by it to reach the surface in seconds is (take g=10ms−2)