50278 + Interview Questions in Physics Page 164 InterviewSolution

8151.	Question 14For the following statements, write T for True and F for False.(a) J.J. Thomson proposed that the nucleus of an atom contains only nucleons.(b) A neutron is formed by an electron and a proton combining together. Therefore, it is neutral.(c) The mass of an electron is about 12000 times that of proton.(d) An isotope of iodine is used for making tincture iodine, which is used as a medicine.
Answer» Question 14 For the following statements, write T for True and F for False. (a) J.J. Thomson proposed that the nucleus of an atom contains only nucleons. (b) A neutron is formed by an electron and a proton combining together. Therefore, it is neutral. (c) The mass of an electron is about $\frac{1}{2000}$ times that of proton. (d) An isotope of iodine is used for making tincture iodine, which is used as a medicine.

Discussion

8152.	A 1.0 m long metallic rod is rotated with an angular frequency of400 rad s–1 about an axis normal to the rod passing through its one end. The other end of the rod is in contact with a circular metallicring. A constant and uniform magnetic field of 0.5 T parallel to theaxis exists everywhere. Calculate the emf developed between the centre and the ring.
Answer» A 1.0 m long metallic rod is rotated with an angular frequency of400 rad s–1 about an axis normal to the rod passing through its one end. The other end of the rod is in contact with a circular metallicring. A constant and uniform magnetic field of 0.5 T parallel to theaxis exists everywhere. Calculate the emf developed between the centre and the ring.

Discussion

8153.	The temperature of the sun is measured with
Answer» The temperature of the sun is measured with

8153.

The temperature of the sun is measured with

Answer»

The temperature of the sun is measured with

Discussion

8154.	A particle executes simple harmonic oscillation with an amplitude A. If the time period of oscillation is T, then minimum time taken by the particle to travel half of the amplitude from the equilibrium position is
Answer» A particle executes simple harmonic oscillation with an amplitude $A$ . If the time period of oscillation is $T$ , then minimum time taken by the particle to travel half of the amplitude from the equilibrium position is

Discussion

8155.	49. What is the meaning of an equilibrium will be established between vapour phase and liquid phase?
Answer» 49. What is the meaning of an equilibrium will be established between vapour phase and liquid phase?

Discussion

8156.	A particle executes SHM in a straight line. In first second starting from rest it travels a distance P and in next second it Travels q in same direction then the amplitude of SHM is 1)2p^2/3q-p. 2)3p^2/3p-q. 3)2p^2/3q-p. 4)2p^2/3p-q
Answer» A particle executes SHM in a straight line. In first second starting from rest it travels a distance P and in next second it Travels q in same direction then the amplitude of SHM is 1)2p^2/3q-p. 2)3p^2/3p-q. 3)2p^2/3q-p. 4)2p^2/3p-q

Discussion

8157.	A block of mass 2kg hangs from the rim of a wheel of radius 0.5m. On releasing from rest the block falls through 5m height in 2s. The moment of inertia of the wheel will be
Answer» A block of mass 2kg hangs from the rim of a wheel of radius 0.5m. On releasing from rest the block falls through 5m height in 2s. The moment of inertia of the wheel will be

Discussion

8158.	If the sides of a wall having thermal conductivity K are maintained at temperatures of T1 and T2, the temperature as a function of x can be written as T(x)=(T2−T1)(xL)+T1 Find the heat flux through the wall. Take T1>T2
Answer» If the sides of a wall having thermal conductivity $K$ are maintained at temperatures of $T_{1}$ and $T_{2}$ , the temperature as a function of $x$ can be written as $T (x) = (T_{2} - T_{1}) (\frac{x}{L}) + T_{1}$ Find the heat flux through the wall. Take $T_{1} > T_{2}$

Discussion

8159.	why is gravitation independant of medium
Answer» why is gravitation independant of medium

Discussion

8160.	What is the velocity of man so that rain appear to fall vertically if the velocity of rain is 30m/s at angle 53’ with verticle,also what is velocity with what rain strike the man
Answer» What is the velocity of man so that rain appear to fall vertically if the velocity of rain is 30m/s at angle 53’ with verticle,also what is velocity with what rain strike the man

Discussion

8161.	A conducting wire of length l and cross-section area A is tied between two rigid supports and is vibrating in its fundamental mode with frequency 'f' and amplitude 'a' in a uniform magnetic field 'B' normal to the plane of vibration. The maximum potential difference generated across the wire will be. [B = 2T , f = 100 Hz, L = 1m, a = 5 mm & A=10−4m2](Write upto two digits after the decimal point.)
Answer» A conducting wire of length l and cross-section area A is tied between two rigid supports and is vibrating in its fundamental mode with frequency 'f' and amplitude 'a' in a uniform magnetic field 'B' normal to the plane of vibration. The maximum potential difference generated across the wire will be. [B = 2T , f = 100 Hz, L = 1m, a = 5 mm & $A = 10^{- 4} m^{2}]$ (Write upto two digits after the decimal point.)

Discussion

8162.	The slope of normal to the curve y=√x2−3x+3 at point, where its ordinate and abscissa are equal, is
Answer» The slope of normal to the curve $y = \sqrt{x^{2} - 3 x + 3}$ at point, where its ordinate and abscissa are equal, is

Discussion

8163.	A particle executes simple harmonic motion represented by displacement function as x(t)=Asin(ωt+ϕ). If the position and velocity of the particle at t=0 s are 2 cm and 2ω cm s−1 respectively, then its amplitude is x√2 cm where the value of x is
Answer» A particle executes simple harmonic motion represented by displacement function as $x (t) = A sin (ω t + ϕ) .$ If the position and velocity of the particle at $t = 0 s$ are $2 cm$ and $2 ω {cm s}^{- 1}$ respectively, then its amplitude is $x \sqrt{2} cm$ where the value of $x$ is

Discussion

8164.	A block of mass m=2 kg is placed on a plank of mass M=10 kg which is placed on a smooth horizontal plane. The coefficient of friction between the block and the plank is μ=13. If a horizontal force F is applied on the plank, then find the maximum value of F( in N) for which the block and the plank move together without toppling. (Take g=10m/s2)
Answer» A block of mass $m = 2 kg$ is placed on a plank of mass $M = 10 kg$ which is placed on a smooth horizontal plane. The coefficient of friction between the block and the plank is $μ = \frac{1}{3}$ . If a horizontal force F is applied on the plank, then find the maximum value of $F$ ( in N) for which the block and the plank move together without toppling. (Take $g = 10 m / s^{2})$

Discussion

8165.	A particle moves in a circle of radius 5cm with cons†an t speed and time period 0.2pi seconds.The acceleration of the particle is options:1)5m/sec2 2)15 m/sec2 3)25m/sec2 4)36m/sec
Answer» A particle moves in a circle of radius 5cm with cons†an t speed and time period 0.2pi seconds.The acceleration of the particle is options:1)5m/sec2 2)15 m/sec2 3)25m/sec2 4)36m/sec

Discussion

8166.	A small bar A resting on a smooth horizontal plane is attached by threads to a point P and by means of a weightless pulley, to a weight B possessing the same mass as the bar itself. The bar is also attached to a point O by means of a light non-deformed spring of length l0=50 cm and stiffness k=5mgl0, where m is the mass of the bar. The thread PA having been burned, the bar starts moving to the right. Find its velocity at the moment when it breaks off the plane.
Answer» A small bar $A$ resting on a smooth horizontal plane is attached by threads to a point $P$ and by means of a weightless pulley, to a weight $B$ possessing the same mass as the bar itself. The bar is also attached to a point $O$ by means of a light non-deformed spring of length $l_{0} = 50 cm$ and stiffness $k = \frac{5 m g}{l_{0}},$ where $m$ is the mass of the bar. The thread $PA$ having been burned, the bar starts moving to the right. Find its velocity at the moment when it breaks off the plane.

Discussion

8167.	A cylinder of mass m and radius r rolls down a circular track from point A as shown in the figure. Assume r<<R and the friction is just sufficient to support the rolling. Velocity of the cylinder at point A is zero. The reaction by the track on the cylinder at point B is
Answer» A cylinder of mass m and radius r rolls down a circular track from point A as shown in the figure. Assume $r << R$ and the friction is just sufficient to support the rolling. Velocity of the cylinder at point A is zero. The reaction by the track on the cylinder at point B is

Discussion

8168.	9. What is dipole? What is zero and non zero dipole moment?
Answer» 9. What is dipole? What is zero and non zero dipole moment?

Discussion

8169.	For a radioactive material, its activity A and rate of change of its activity R are defined as A=−dNdt and R=−dAdt, where N(t) is the number of nuclei at time t. Two radioactive sources P(mean life τ) and Q (mean life 2τ) have the same activity at t = 0. Their rates of change of activitites at t = 2τ are RP and RQ, respectively. If RPRQ=ne, then the value of n is
Answer» For a radioactive material, its activity A and rate of change of its activity R are defined as $A = - \frac{d N}{d t}$ and $R = - \frac{d A}{d t}$ , where N(t) is the number of nuclei at time t. Two radioactive sources P(mean life $τ$ ) and Q (mean life 2 $τ$ ) have the same activity at t = 0. Their rates of change of activitites at t = 2 $τ$ are R $_{P}$ and R $_{Q}$ , respectively. If $\frac{R_{P}}{R_{Q}} = \frac{n}{e}$ , then the value of n is

Discussion

8170.	Two rods OA and OB of equal lengths and masses are lying in the xy plane as shown in figure. Let Ix,Iy and Iz be the moments of inertia of both the rods about x,y and z axis respectively. Then,
Answer» Two rods $OA$ and $OB$ of equal lengths and masses are lying in the $x y$ plane as shown in figure. Let $I_{x}, I_{y}$ and $I_{z}$ be the moments of inertia of both the rods about $x, y$ and $z$ axis respectively. Then,

Discussion

8171.	Which is the correct electronic configuration of the element Mendelevium (Md)?
Answer» Which is the correct electronic configuration of the element Mendelevium (Md)?

Discussion

8172.	The capacitor C1 in the figure initially carries a charge q0. When the switch S1 and S2 are closed, capacitor C1 is connected to a resistor R and a second capacitor C2 which initially does not carry any charge. The current i, through resistor R as a function of time t is represented as:
Answer» The capacitor $C_{1}$ in the figure initially carries a charge $q_{0}$ . When the switch $S_{1}$ and $S_{2}$ are closed, capacitor $C_{1}$ is connected to a resistor $R$ and a second capacitor $C_{2}$ which initially does not carry any charge. The current $i$ , through resistor $R$ as a function of time $t$ is represented as:

Discussion

8173.	Position, x (in metre) of a particle varies with time t (in second) as x(t) = 2 + 2t + t2 + t3. The ratio of magnitude of average velocity and magnitude of average acceleration of the particle for the time interval t = 1 s to t = 2 s is
Answer» Position, x (in metre) of a particle varies with time t (in second) as x(t) = 2 + 2t + t2 + t3. The ratio of magnitude of average velocity and magnitude of average acceleration of the particle for the time interval t = 1 s to t = 2 s is

Discussion

8174.	A certain prism is found to produce a minimum deviation of 38∘. It produces a deviation of 44∘ when the angle of incidence is either 42∘ or 62∘. What is the angle of incidence when it is undergoing minimum deviation ?
Answer» A certain prism is found to produce a minimum deviation of $38^{\circ}$ . It produces a deviation of $44^{\circ}$ when the angle of incidence is either $42^{\circ}$ or $62^{\circ}$ . What is the angle of incidence when it is undergoing minimum deviation ?

Discussion

8175.	Two listeners are standing at different distances from the bed of a railway line. When a train passes them, each hears how the frequency of the train whistle changes, with the change occurring along curve 1 for one observer and along curve 2 for the other. Then,
Answer» Two listeners are standing at different distances from the bed of a railway line. When a train passes them, each hears how the frequency of the train whistle changes, with the change occurring along curve 1 for one observer and along curve 2 for the other. Then,

8175.

Two listeners are standing at different distances from the bed of a railway line. When a train passes them, each hears how the frequency of the train whistle changes, with the change occurring along curve 1 for one observer and along curve 2 for the other. Then,

Answer»

Two listeners are standing at different distances from the bed of a railway line. When a train passes them, each hears how the frequency of the train whistle changes, with the change occurring along curve 1 for one observer and along curve 2 for the other. Then,

Discussion

8176.	What are the Basic concepts of Kinetic molecular theory?
Answer» What are the Basic concepts of Kinetic molecular theory?

Discussion

8177.	the pressure and density of a diatomic gas γ=7/5 change adiabatically from P,d to P',d' if d'/d=32 then P'/P SHOULD BE
Answer» the pressure and density of a diatomic gas γ=7/5 change adiabatically from P,d to P',d' if d'/d=32 then P'/P SHOULD BE

Discussion

8178.	A proton is fired from with velocity →v=v0^j+v0^k in a uniform magnetic field →B=B0^j (Take m=mass and q= charge). X-coordinate of the particle after half revolution.
Answer» A proton is fired from with velocity $\to v = v_{0}^j + v_{0}^k$ in a uniform magnetic field $\to B = B_{0}^j$ (Take $m =$ mass and $q =$ charge). $X-$ coordinate of the particle after half revolution.

Discussion

8179.	152.An ideal string is wrapped several times on a solid cylinder of mass 4 my and radius 1 m. The pulleys are ideal and the surface between block and ground is smooth. If the torque acting on the cylinder is 10x/9 N-m, then find the value of X.
Answer» 152.An ideal string is wrapped several times on a solid cylinder of mass 4 my and radius 1 m. The pulleys are ideal and the surface between block and ground is smooth. If the torque acting on the cylinder is 10x/9 N-m, then find the value of X.

Discussion

8180.	21. If the vapour density of an oxide of divalent metal is 20 then the equivalent of metal is
Answer» 21. If the vapour density of an oxide of divalent metal is 20 then the equivalent of metal is

Discussion

8181.	A particle of mass m and charge (–q) enters the region between thetwo charged plates initially moving along x-axis with speed vx (likeparticle 1 in Fig. 1.33). The length of plate is L and an uniformelectric field E is maintained between the plates. Show that thevertical deflection of the particle at the far edge of the plate isqEL2/(2m vx2).Compare this motion with motion of a projectile in gravitational fielddiscussed in Section 4.10 of Class XI Textbook of Physics.
Answer» A particle of mass m and charge (–q) enters the region between thetwo charged plates initially moving along x-axis with speed vx (likeparticle 1 in Fig. 1.33). The length of plate is L and an uniformelectric field E is maintained between the plates. Show that thevertical deflection of the particle at the far edge of the plate isqEL2/(2m vx2).Compare this motion with motion of a projectile in gravitational fielddiscussed in Section 4.10 of Class XI Textbook of Physics.

Discussion

8182.	A simple pendulum oscillating in air has a period of 1 minute. The bob of the pendulum is completely immersed in a non-viscous liquid. If the density of the liquid is (34)th of the density of the material of the body and the bob is inside the liquid at all time, its period of oscillation in the liquid will be
Answer» A simple pendulum oscillating in air has a period of $1$ minute. The bob of the pendulum is completely immersed in a non-viscous liquid. If the density of the liquid is ${(\frac{3}{4})}^{t h}$ of the density of the material of the body and the bob is inside the liquid at all time, its period of oscillation in the liquid will be

Discussion

8183.	A ball of mass m and radius r is released in a viscous liquid. The value of its terminal velocity is proportional to
Answer» A ball of mass $m$ and radius $r$ is released in a viscous liquid. The value of its terminal velocity is proportional to

Discussion

8184.	When a wave travels in a medium, the particle displacement is given by y(x,t)=0.03 sin π(2t−0.01x) where y and x are expressed in metres and t in seconds. At a given instant of time, the phase difference between two particles 25 m apart is
Answer» When a wave travels in a medium, the particle displacement is given by $y (x, t) = 0.03 s i n π (2 t - 0.01 x)$ where y and x are expressed in metres and t in seconds. At a given instant of time, the phase difference between two particles 25 m apart is

Discussion

8185.	94Pu239 is undergoing α− decay according to the equation94Pu239→ 92U235+ 2He4The energy released in the process is mostly kinetic energy of the α− particle. However, a part of the energy is released as γ− rays. What is the speed of the emitted α− particle if the γ−rays radiated out have energy of 0.90 MeV?Given:Mass of 94Pu239=239.05122 uMass of 92U235=235.04299 u Mass of2He4=4.002602 u(1uc2=931 MeV)
Answer» $_{94} {Pu}^{239}$ is undergoing $α -$ decay according to the equation $_{94} {Pu}^{239} \to_{92} U^{235} +_{2} {He}^{4}$ The energy released in the process is mostly kinetic energy of the $α -$ particle. However, a part of the energy is released as $γ -$ rays. What is the speed of the emitted $α -$ particle if the $γ -$ rays radiated out have energy of $0.90 MeV ?$ Given: Mass of $_{94} {Pu}^{239} = 239.05122 u$ Mass of $_{92} U^{235} = 235.04299 u$ Mass of $_{2} {He}^{4} = 4.002602 u$ $(1 u c^{2} = 931 MeV)$

Discussion

8186.	A hospital uses an ultrasonic scanner to locate tumours in a tissue. What is the wavelength of sound in the tissue in which the speed of sound is 1.7kms−1? The operating frequency of the scanner is 4.2 MHz.
Answer» A hospital uses an ultrasonic scanner to locate tumours in a tissue. What is the wavelength of sound in the tissue in which the speed of sound is $1.7 k m s^{- 1}$ ? The operating frequency of the scanner is 4.2 MHz.

Discussion

8187.	If we put a charge inside conductor/hollow bodies/conducting bodies/shell ,does potential keeping on rises keeping field zero as charges run towarss surface to maintain charge and field zero inside because no charge reside on surface
Answer» If we put a charge inside conductor/hollow bodies/conducting bodies/shell ,does potential keeping on rises keeping field zero as charges run towarss surface to maintain charge and field zero inside because no charge reside on surface

Discussion

8188.	If potential (in (in Volt) in a region is expressed as, V(x,y,z)=6xy−y+2yzThe electric field (in N/C) at point (1,1,0) is
Answer» If potential (in $(in Volt)$ in a region is expressed as, $V (x, y, z) = 6 x y - y + 2 y z$ The electric field $(in N/C)$ at point $(1, 1, 0)$ is

Discussion

8189.	87.two point charge q and -2q are kept on x-axisat (-a,0,0) and (2a,0,0).Find the locus of points where electric potential is 0.
Answer» 87.two point charge q and -2q are kept on x-axisat (-a,0,0) and (2a,0,0).Find the locus of points where electric potential is 0.

Discussion

8190.	Comparing the L-C oscillations with the oscillations of a spring- block system (force constant of spring = k and mass of block = m), the physical quantity mk is similar to :-(1) CL (2) 1/CL (3) C/L (4) L/C
Answer» Comparing the L-C oscillations with the oscillations of a spring- block system (force constant of spring = k and mass of block = m), the physical quantity mk is similar to :- (1) CL (2) 1/CL (3) C/L (4) L/C

Discussion

8191.	A wheel of radius 1m rolls forward half a revolution on a horizontal ground the magnitude of the displacement of the wheel intially in contact with the ground is
Answer» A wheel of radius 1m rolls forward half a revolution on a horizontal ground the magnitude of the displacement of the wheel intially in contact with the ground is

Discussion

8192.	what are amphoteric solids?
Answer» what are amphoteric solids?

Discussion

8193.	A sound wave of frequency 100 Hz is travelling in air. The speed of sound in air is 350 m s−1.What is the phase difference at a given instant between two points separated by a distance of 10.0 cm along the direction of propagation?
Answer» A sound wave of frequency 100 Hz is travelling in air. The speed of sound in air is 350 m s $^{- 1}$ . What is the phase difference at a given instant between two points separated by a distance of 10.0 cm along the direction of propagation?

8193.

A sound wave of frequency 100 Hz is travelling in air. The speed of sound in air is 350 m s−1.What is the phase difference at a given instant between two points separated by a distance of 10.0 cm along the direction of propagation?

Answer»

A sound wave of frequency 100 Hz is travelling in air. The speed of sound in air is 350 m s $^{- 1}$ .

What is the phase difference at a given instant between two points separated by a distance of 10.0 cm along the direction of propagation?

Discussion

8194.	A particle of mass m is fixed to one end of a light spring of force constant k and unstretched length l. The system is rotated about the other end of the spring with an angular speed omega in gravity free space. Find elongation in spring.
Answer» A particle of mass m is fixed to one end of a light spring of force constant k and unstretched length l. The system is rotated about the other end of the spring with an angular speed omega in gravity free space. Find elongation in spring.

Discussion

8195.	A : A cloth covers a table, some dishes are kept on it. The cloth can be pulled out without dislodging the dishes from the table. R : For every action there is equal and opposite reaction
Answer» A : A cloth covers a table, some dishes are kept on it. The cloth can be pulled out without dislodging the dishes from the table. R : For every action there is equal and opposite reaction

Discussion

8196.	<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}-->What will be its height, if its total surface area is 760 sq cm?
Answer» <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> What will be its height, if its total surface area is 760 sq cm?

Discussion

8197.	Question 16An object of mass 100 kg is accelerated uniformly from a velocity of 5 ms−1 to 8 ms−1 in 6 s. Calculate the initial and final momentum of the object. Also, find the magnitude of the force exerted on the object.
Answer» Question 16 An object of mass 100 kg is accelerated uniformly from a velocity of $5 m s^{- 1} t o 8 m s^{- 1}$ in 6 s. Calculate the initial and final momentum of the object. Also, find the magnitude of the force exerted on the object.

Discussion

8198.	(a)A conductor A with a cavity as shown in Fig. 1.36(a) is given acharge Q.Show that the entire charge must appear on the outer surface of theconductor. (b) Another conductor B with charge qis inserted into the cavity keepingB insulated from A. Show that the total charge on the outside surfaceof A is Q +q [Fig.1.36(b)]. (c) A sensitive instrument is to be shielded from thestrong electrostatic fields in its environment. Suggest a possibleway.
Answer» (a) A conductor A with a cavity as shown in Fig. 1.36(a) is given a charge Q. Show that the entire charge must appear on the outer surface of the conductor. (b) Another conductor B with charge q is inserted into the cavity keeping B insulated from A. Show that the total charge on the outside surface of A is Q + q [Fig. 1.36(b)]. (c) A sensitive instrument is to be shielded from the strong electrostatic fields in its environment. Suggest a possible way.

8198.

(a)A conductor A with a cavity as shown in Fig. 1.36(a) is given acharge Q.Show that the entire charge must appear on the outer surface of theconductor. (b) Another conductor B with charge qis inserted into the cavity keepingB insulated from A. Show that the total charge on the outside surfaceof A is Q +q [Fig.1.36(b)]. (c) A sensitive instrument is to be shielded from thestrong electrostatic fields in its environment. Suggest a possibleway.

Answer»

(a)
A conductor A with a cavity as shown in Fig. 1.36(a) is given a
charge Q.
Show that the entire charge must appear on the outer surface of the
conductor. (b) Another conductor B with charge q
is inserted into the cavity keeping
B insulated from A. Show that the total charge on the outside surface
of A is Q +
q [Fig.
1.36(b)]. (c) A sensitive instrument is to be shielded from the
strong electrostatic fields in its environment. Suggest a possible
way.

Discussion

8199.	From the top of a tower, a stone is thrown up and reaches the ground in time t1 . A second stone is thrown down with the same speed and reaches the ground in time t2. A third stone is released from rest and reaches the ground in time t3 -
Answer» From the top of a tower, a stone is thrown up and reaches the ground in time $t_{1}$ . A second stone is thrown down with the same speed and reaches the ground in time $t_{2}$ . A third stone is released from rest and reaches the ground in time $t_{3}$ -

Discussion

8200.	Air streams horizontally past an airplane. The speed of air over the top surface of the wings is 60 m/s and that under the bottom surface is 45 m/s. The density of air is 1.293 kg/m3. Then, the difference in pressure between the top and bottom surface of the wings is: (Consider airplane to be flying at a constant altitude)
Answer» Air streams horizontally past an airplane. The speed of air over the top surface of the wings is $60 m/s$ and that under the bottom surface is $45 m/s$ . The density of air is $1.293 {kg/m}^{3}$ . Then, the difference in pressure between the top and bottom surface of the wings is: (Consider airplane to be flying at a constant altitude)

Discussion

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Position, x (in metre) of a particle varies with time t (in second) as x(t) = 2 + 2t + t2 + t3. The ratio of magnitude of average velocity and magnitude of average acceleration of the particle for the time interval t = 1 s to t = 2 s is

A certain prism is found to produce a minimum deviation of 38∘. It produces a deviation of 44∘ when the angle of incidence is either 42∘ or 62∘. What is the angle of incidence when it is undergoing minimum deviation ?

Two listeners are standing at different distances from the bed of a railway line. When a train passes them, each hears how the frequency of the train whistle changes, with the change occurring along curve 1 for one observer and along curve 2 for the other. Then,

What are the Basic concepts of Kinetic molecular theory?

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21. If the vapour density of an oxide of divalent metal is 20 then the equivalent of metal is

A ball of mass m and radius r is released in a viscous liquid. The value of its terminal velocity is proportional to

When a wave travels in a medium, the particle displacement is given by y(x,t)=0.03 sin π(2t−0.01x) where y and x are expressed in metres and t in seconds. At a given instant of time, the phase difference between two particles 25 m apart is

A hospital uses an ultrasonic scanner to locate tumours in a tissue. What is the wavelength of sound in the tissue in which the speed of sound is 1.7kms−1? The operating frequency of the scanner is 4.2 MHz.

If we put a charge inside conductor/hollow bodies/conducting bodies/shell ,does potential keeping on rises keeping field zero as charges run towarss surface to maintain charge and field zero inside because no charge reside on surface

If potential (in (in Volt) in a region is expressed as, V(x,y,z)=6xy−y+2yzThe electric field (in N/C) at point (1,1,0) is

87.two point charge q and -2q are kept on x-axisat (-a,0,0) and (2a,0,0).Find the locus of points where electric potential is 0.

Comparing the L-C oscillations with the oscillations of a spring- block system (force constant of spring = k and mass of block = m), the physical quantity mk is similar to :-(1) CL (2) 1/CL (3) C/L (4) L/C

A wheel of radius 1m rolls forward half a revolution on a horizontal ground the magnitude of the displacement of the wheel intially in contact with the ground is

what are amphoteric solids?

A sound wave of frequency 100 Hz is travelling in air. The speed of sound in air is 350 m s−1.What is the phase difference at a given instant between two points separated by a distance of 10.0 cm along the direction of propagation?

A particle of mass m is fixed to one end of a light spring of force constant k and unstretched length l. The system is rotated about the other end of the spring with an angular speed omega in gravity free space. Find elongation in spring.

A : A cloth covers a table, some dishes are kept on it. The cloth can be pulled out without dislodging the dishes from the table. R : For every action there is equal and opposite reaction

&lt;!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--&gt;What will be its height, if its total surface area is 760 sq cm?

Question 16An object of mass 100 kg is accelerated uniformly from a velocity of 5 ms−1 to 8 ms−1 in 6 s. Calculate the initial and final momentum of the object. Also, find the magnitude of the force exerted on the object.

From the top of a tower, a stone is thrown up and reaches the ground in time t1 . A second stone is thrown down with the same speed and reaches the ground in time t2. A third stone is released from rest and reaches the ground in time t3 -

If the sides of a wall having thermal conductivity K are maintained at temperatures of T1 and T2, the temperature as a function of x can be written as T(x)=(T2−T1)(xL)+T1 Find the heat flux through the wall. Take T1>T2

A cylinder of mass m and radius r rolls down a circular track from point A as shown in the figure. Assume r<<R and the friction is just sufficient to support the rolling. Velocity of the cylinder at point A is zero. The reaction by the track on the cylinder at point B is

What will be its height, if its total surface area is 760 sq cm?