50278 + Interview Questions in Physics Page 121 InterviewSolution

6001.	14.Two springs of spring constant K each are connected in parallel to a mass m. Then they are connected in series with the same mass m. Compare frequencies of oscillation in these cases.
Answer» 14.Two springs of spring constant K each are connected in parallel to a mass m. Then they are connected in series with the same mass m. Compare frequencies of oscillation in these cases.

Discussion

6002.

A musical instrument is made using four different metal strings. 1,2,3 and 4 with mass per unit length μ,2μ,3μ and 4μ respectively. The instrument is played by vibrating the strings by varying the free length in between the range L0 and 2L0. It is found that in string- 1 (μ) at free length L0 and tension T0 the fundamental mode frequency is f0. List-I gives the above four strings while List-II lists the magnitude of some quantity. List-I List-II(i)String-1(μ)(P)1(ii)String-2(2μ)(Q)1/2(iii)String- 3(3μ)(R)1/√2(iv)String-4(4μ)(S)1/√3 (T)3/16 (U)1/16 The length of the strings 1,2,3 and 4 are kept fixed at L0,3L02,5L04 and 7L04 respectively.Strings 1,2,3 and 4 are vibrated at their 1 st, 3 rd, 5 th, and 14 th harmonics, respectively such that all the strings have same frequency. The correct match for the tension in the four strings in the units of T0 will be,

Answer»

A musical instrument is made using four different metal strings. $1, 2, 3$ and 4 with mass per unit length $μ, 2 μ, 3 μ$ and $4 μ$ respectively. The instrument is played by vibrating the strings by varying the free length in between the range $L_{0}$ and $2 L_{0}$ . It is found that in string- 1 $(μ)$ at free length $L_{0}$ and tension $T_{0}$ the fundamental mode frequency is $f_{0}$ . List-I gives the above four strings while List-II lists the magnitude of some quantity.

	List-I		List-II
(i)	String-1 $(μ)$	(P)	$1$
(ii)	String-2 $(2 μ)$	(Q)	$1 / 2$
(iii)	String- 3 $(3 μ)$	(R)	$1 / \sqrt{2}$
(iv)	String-4 $(4 μ)$	(S)	$1 / \sqrt{3}$
		(T)	$3 / 16$
		(U)	$1 / 16$

The length of the strings $1, 2, 3$ and 4 are kept fixed at $L_{0}, \frac{3 L_{0}}{2}, \frac{5 L_{0}}{4}$ and $\frac{7 L_{0}}{4}$ respectively.

Strings $1, 2, 3$ and 4 are vibrated at their 1 st, 3 rd, 5 th, and 14 th harmonics, respectively such that all the strings have same frequency. The correct match for the tension in the four strings in the units of $T_{0}$ will be,

Discussion

6003.	At relatively high pressure, van der Waals equation reduces to
Answer» At relatively high pressure, van der Waals equation reduces to

Discussion

6004.	A film of water is formed between two straight parallel wires each 10 cm long and at separation 0.5 cm. Calculate the work required to increase 1 mm distance between the wires. Surface tension of water=72×10−3 N/m.
Answer» A film of water is formed between two straight parallel wires each $10 cm$ long and at separation $0.5 cm$ . Calculate the work required to increase $1 mm$ distance between the wires. Surface tension of water $= 72 \times 10^{- 3} N/m$ .

Discussion

6005.	Find the half angular width of the central bright maximum in the Fraunhofer diffraction pattern of a slit of width12 10- cm when the slit is illuminated by monochromatic light of wavelength 6000 A.
Answer» Find the half angular width of the central bright maximum in the Fraunhofer diffraction pattern of a slit of width12 10- cm when the slit is illuminated by monochromatic light of wavelength 6000 A.

Discussion

6006.	A body of mass 3.0 kg moves under the influence of some external force such that its position s as a function of time t is given by s=6t3−t2+1, where s is in metres and t is in seconds. The work done by the force in first three seconds is
Answer» A body of mass $3.0 kg$ moves under the influence of some external force such that its position s as a function of time t is given by $s = 6 t^{3} - t^{2} + 1,$ where $s$ is in metres and $t$ is in seconds. The work done by the force in first three seconds is

Discussion

6007.	a cell of emf E and internal resistance r is connected across a load resistance R ,the maximum power delivered in the load is
Answer» a cell of emf E and internal resistance r is connected across a load resistance R ,the maximum power delivered in the load is

Discussion

6008.	In the diagram given ahead, which bulb out of B1 and B2 will glow and why ? (b) Draw a diagram of an illumunated p-n junction solar cell. (c) Explain briefly the three processes due to which generation of emf takes place in a solar cell.
Answer» In the diagram given ahead, which bulb out of $B_{1}$ and $B_{2}$ will glow and why ? (b) Draw a diagram of an illumunated p-n junction solar cell. (c) Explain briefly the three processes due to which generation of emf takes place in a solar cell.

Discussion

6009.	Which of the following isn’t correct for a fixed amount of ideal gas at constant volume?
Answer» Which of the following isn’t correct for a fixed amount of ideal gas at constant volume?

Discussion

6010.	A convex lens of focal length f is placed at origin. Object is placed on negative x-axis anywhere between −∞ to +∞. Choose correct graph between 'u' and 'v'.
Answer» A convex lens of focal length f is placed at origin. Object is placed on negative x-axis anywhere between $- \infty$ to $+ \infty$ . Choose correct graph between 'u' and 'v'.

Discussion

6011.	The translational kinetic energy of all the molecules of Helium having a volume V exerting a pressure P is 1000 J. The total kinetic energy (in Joule) of all the molecules of N2 having the same volume V and exerting a pressure 2P is
Answer» The translational kinetic energy of all the molecules of Helium having a volume $V$ exerting a pressure $P$ is $1000 J$ . The total kinetic energy (in $Joule$ ) of all the molecules of $N_{2}$ having the same volume $V$ and exerting a pressure $2 P$ is

Discussion

6012.	A ball is bouncing down a set of stairs. The coefficient of restitution is e. The height of each step is d and the ball bounces one step at each bounce. After each bounce the ball rebounds to a height h above the next lower step. Neglect height of each step in comparison to h and assume the impacts to be effectively head on. Which of the following relation is correct? (given that h>d)
Answer» A ball is bouncing down a set of stairs. The coefficient of restitution is $e$ . The height of each step is $d$ and the ball bounces one step at each bounce. After each bounce the ball rebounds to a height $h$ above the next lower step. Neglect height of each step in comparison to $h$ and assume the impacts to be effectively head on. Which of the following relation is correct? (given that $h > d$ )

Discussion

6013.	A body executes SHM under action of force F1 with time period 4/5 second. If the force is changed to F2 , it has time period 3/5 second , if both F1 and F2 act simultaneously in the same direction on the body , its time period will be A. 12/25 s B. 24/25 s C. 35/24 s D. 15/24 s
Answer» A body executes SHM under action of force F1 with time period 4/5 second. If the force is changed to F2 , it has time period 3/5 second , if both F1 and F2 act simultaneously in the same direction on the body , its time period will be A. 12/25 s B. 24/25 s C. 35/24 s D. 15/24 s

Discussion

6014.	A transverse wave y=5sin(3t−x), where y,x,t are in SI units, is propagating on a stretched string having density ρ=1 kg/m3. Find the intensity of propagating wave.
Answer» A transverse wave $y = 5 sin (3 t - x)$ , where $y, x, t$ are in SI units, is propagating on a stretched string having density $ρ = 1 {kg/m}^{3}$ . Find the intensity of propagating wave.

Discussion

6015.	A projectile is fired at 30∘ with momentum p. Neglecting friction, the change in kinetic energy when it returns to the ground will be
Answer» A projectile is fired at $30^{\circ}$ with momentum p. Neglecting friction, the change in kinetic energy when it returns to the ground will be

Discussion

6016.	A gas mixture consists of 2 moles of oxygen and 4 moles of argon at temperature T. Neglecting all vibrational modes, the total internal energy of the system is
Answer» A gas mixture consists of $2$ moles of oxygen and $4$ moles of argon at temperature $T$ . Neglecting all vibrational modes, the total internal energy of the system is

Discussion

6017.	A paraxial ray parallel to x− axis is incident at a point P on a parabolic reflecting surface, and the reflected ray becomes parallel to y− axis as shown in the figure. If the equation of the parabola is given by y2=2x, then the coordinates of P are
Answer» A paraxial ray parallel to $x -$ axis is incident at a point $P$ on a parabolic reflecting surface, and the reflected ray becomes parallel to $y -$ axis as shown in the figure. If the equation of the parabola is given by $y^{2} = 2 x$ , then the coordinates of $P$ are

Discussion

6018.	A cricketer hits a ball with a velocity 25m/s at 60 degree angle above the horizontal.how far above the ground it passes over a fielder 50m from the bat??
Answer» A cricketer hits a ball with a velocity 25m/s at 60 degree angle above the horizontal.how far above the ground it passes over a fielder 50m from the bat??

Discussion

6019.	A series L-C-R circuit with R = 120 Ω has an angular frequency of 4×105 rad/sec. At resonance, voltages across resistance and inductor are 60 V and 40 V respectively. If frequency at which the circuit current lags behind the voltage by a phase of π/4 radian is k × 105 rad/sec, then the value of k is (answer upto two decimal places)
Answer» A series L-C-R circuit with R = 120 $Ω$ has an angular frequency of $4 \times 10^{5}$ rad/sec. At resonance, voltages across resistance and inductor are 60 $V$ and 40 $V$ respectively. If frequency at which the circuit current lags behind the voltage by a phase of π/4 radian is $k \times 10^{5}$ rad/sec, then the value of $k$ is (answer upto two decimal places)

Discussion

6020.	A bus of mass M hits a man of mass m standing on the road. If M>>m and initially bus was moving with 15 m/s. What will be the speed of man just after the collision? Assuming collision is perfectly elastic.
Answer» A bus of mass $M$ hits a man of mass $m$ standing on the road. If $M >> m$ and initially bus was moving with $15 m/s$ . What will be the speed of man just after the collision? Assuming collision is perfectly elastic.

Discussion

6021.	A 8kg stone tied at the end of a string 1m long is whirled in a vertical circle. At a ins†an t the string makes an angle a with vertical , the speed of stone is 4m/sec anf the tension in the thread is 104N . then a is?
Answer» A 8kg stone tied at the end of a string 1m long is whirled in a vertical circle. At a ins†an t the string makes an angle a with vertical , the speed of stone is 4m/sec anf the tension in the thread is 104N . then a is?

Discussion

6022.	A cloud is at a potential of 8×106 volts relative to the ground. A charge of 80 coulombs is transferred in lighting stroke between the cloud and the ground. Assuming the potential of the cloud to remain constant the energy dissipated is _.
Answer» A cloud is at a potential of $8 \times 10^{6}$ volts relative to the ground. A charge of 80 coulombs is transferred in lighting stroke between the cloud and the ground. Assuming the potential of the cloud to remain constant the energy dissipated is _.

Discussion

6023.	†ext { If the frequency of a tuning fork is } 5000 Hz †ext { , it produces
Answer» †ext { If the frequency of a tuning fork is } 5000 Hz †ext { , it produces

Discussion

6024.	hello,,......i had already asked this but in dint quite understand it coz it was juzt a copy from the reader..... how does the height of mountain on earth's surface depend upon the shear modulus......y is it not young's modulus? please answer as soon as possible
Answer» hello,,......i had already asked this but in dint quite understand it coz it was juzt a copy from the reader..... how does the height of mountain on earth's surface depend upon the shear modulus......y is it not young's modulus? please answer as soon as possible

Discussion

6025.	A body of volume V and density p is initially submerged in a non-viscous liquid of density σ(>p). If it is rises by itself through a height h in the liquid. Its kinetic energy will (a) increase by hV (σ -p)g (b) increase by hV (p + σ)g (c) decrease by hVpg/σ (d) increase by hVpg
Answer» A body of volume V and density p is initially submerged in a non-viscous liquid of density σ(>p). If it is rises by itself through a height h in the liquid. Its kinetic energy will (a) increase by hV (σ -p)g (b) increase by hV (p + σ)g (c) decrease by hVpg/σ (d) increase by hVpg

Discussion

6026.	The electron in hydrogen atom makes a transition from n=n1 to n=n2 state. The time period of the electron in the initial state is eight times that in the final state. The possible values are
Answer» The electron in hydrogen atom makes a transition from $n = n_{1} to n = n_{2}$ state. The time period of the electron in the initial state is eight times that in the final state. The possible values are

Discussion

6027.	The potential energy of the infinite system of charges as shown in figure will be[ Consider series expansion of ln 2 = (1−12+13−14… )]
Answer» The potential energy of the infinite system of charges as shown in figure will be $[$ Consider series expansion of $l n 2 = (1 - \frac{1}{2} + \frac{1}{3} - \frac{1}{4} \dots)]$

Discussion

6028.	74.What is the formula of Self energy of:- (1) Solid Sphere (2) Hollow Sphere
Answer» 74.What is the formula of Self energy of:- (1) Solid Sphere (2) Hollow Sphere

Discussion

6029.	A body is thrown horizontally with a velocity √2gh from the top of the tower of height h. It strikes the level ground through the foot of the tower at a distance x from the tower. The value of x is
Answer» A body is thrown horizontally with a velocity $\sqrt{2 g h}$ from the top of the tower of height $h$ . It strikes the level ground through the foot of the tower at a distance $x$ from the tower. The value of $x$ is

Discussion

6030.	A body falling from rest describes distances S1,S2 and S3 is the 1st , 2nd and 3rd seconds of its fall .Then the ratio of S1:S2:S3 A) 1:1:1B) 1:3:5C) 1:2:3D) 1:4:9
Answer» A body falling from rest describes distances S1,S2 and S3 is the 1st , 2nd and 3rd seconds of its fall . Then the ratio of S1:S2:S3 A) 1:1:1 B) 1:3:5 C) 1:2:3 D) 1:4:9

Discussion

6031.	An electric charge +q moves with velocity →v=3^i+4^j+^k in the presence of electric and magnetic fields given by →E=3^i+^j+2^k and →B=^i+^j−3^k. The y-component of the force experienced by +q is ?
Answer» An electric charge $+ q$ moves with velocity $\to v = 3^i + 4^j +^k$ in the presence of electric and magnetic fields given by $\to E = 3^i +^j + 2^k$ and $\to B =^i +^j - 3^k$ . The y-component of the force experienced by $+ q$ is ?

Discussion

6032.	The scale factor for the two drawings is given by
Answer» The scale factor for the two drawings is given by

Discussion

6033.	A police van moving on a highway with a speed of 30 km/ h fires a bullet at a thief’s car speeding away in the same direction with a speed of 192 km/ h. If the muzzle speed of the bullet is 150 m s–1, at what speed does the bullet hit the thief’s car? (Note: Obtain that speed which is relevant for damaging the thief’s car).
Answer» A police van moving on a highway with a speed of 30 km/ h fires a bullet at a thief’s car speeding away in the same direction with a speed of 192 km/ h. If the muzzle speed of the bullet is 150 m s–1, at what speed does the bullet hit the thief’s car? (Note: Obtain that speed which is relevant for damaging the thief’s car).

Discussion

6034.	Write the similarities and differences between the motion of a bicycle and a ceiling fan that has been switched on.
Answer» Write the similarities and differences between the motion of a bicycle and a ceiling fan that has been switched on.

Discussion

6035.	Give equation to caoculate voltage across inductor,capacitor and resistor in series LCR circuit
Answer» Give equation to caoculate voltage across inductor,capacitor and resistor in series LCR circuit

Discussion

6036.	Two solid balls of identical size, one of iron and another of wood are released simul†an eously from rest from the same height . If equal force of resis†an ce acts on them then which ball will reach the ground firs
Answer» Two solid balls of identical size, one of iron and another of wood are released simul†an eously from rest from the same height . If equal force of resis†an ce acts on them then which ball will reach the ground firs

Discussion

6037.	As shown in the figure, a battery of emf ϵ is connected to an inductor L and resistance R in series. The switch is closed at t=0. The total charge that flows from the battery, between t=0 and t=tc (tc is the time constant of the circuit) is
Answer» As shown in the figure, a battery of emf $ϵ$ is connected to an inductor $L$ and resistance $R$ in series. The switch is closed at $t = 0$ . The total charge that flows from the battery, between $t = 0$ and $t = t_{c} (t_{c} is the time constant of the circuit) is$

Discussion

6038.	The centres of two identical small conducting spheres are 1m a part. they carry charges of two kinds and attract each other with a force F . when they are connected by a conducting thin wire they repel each other with a force F/3 . what is the ratio of magnitudes of charges carried by the spheres initially . 1. 1:1 2. 2:1 3. 3:1 4.4:1
Answer» The centres of two identical small conducting spheres are 1m a part. they carry charges of two kinds and attract each other with a force F . when they are connected by a conducting thin wire they repel each other with a force F/3 . what is the ratio of magnitudes of charges carried by the spheres initially . 1. 1:1 2. 2:1 3. 3:1 4.4:1

Discussion

6039.	The ratio of the magnetic field at the centre of a current carrying circular wire and the magnetic field at the centre of a square coil of one turn made from the same length of wire will be
Answer» The ratio of the magnetic field at the centre of a current carrying circular wire and the magnetic field at the centre of a square coil of one turn made from the same length of wire will be

Discussion

6040.	Square shaped coil of side 20 cm is rotating as 60 revolutions per minute in a magnetic field of 100 T if number of turns thousands find find maximum EMF develop across the coil
Answer» Square shaped coil of side 20 cm is rotating as 60 revolutions per minute in a magnetic field of 100 T if number of turns thousands find find maximum EMF develop across the coil

Discussion

6041.	Four points masses are placed at the corners of a square of side 2m . Find the centre of mass of the system with respect to the centre ofsquare, if the masses are 4kg ,1kg, 2kg , 3kg?
Answer» Four points masses are placed at the corners of a square of side 2m . Find the centre of mass of the system with respect to the centre of square, if the masses are 4kg ,1kg, 2kg , 3kg?

Discussion

6042.	In the YDSE shown, the two slits are covered with thin sheets having thickness t and 2t and refractive index 2μ and μ respectively. Find the position (y) of central maxima:
Answer» In the $Y D S E$ shown, the two slits are covered with thin sheets having thickness $t$ and $2 t$ and refractive index $2 μ and μ$ respectively. Find the position $(y)$ of central maxima:

Discussion

6043.	A cylindrical drum of height 1 m made of a bad conductor is completely filled with water at 0∘C and is kept outside without a lid. The temperature of the surroundings is −10∘C. Calculate the time taken for the entire mass of the water to freeze. (Thermal conductivity of ice =k, latent heat of fusion Lf=L)[Neglect expansion of water on freezing, ρ = density of water]
Answer» A cylindrical drum of height $1 m$ made of a bad conductor is completely filled with water at $0^{\circ} C$ and is kept outside without a lid. The temperature of the surroundings is $- 10^{\circ} C$ . Calculate the time taken for the entire mass of the water to freeze. (Thermal conductivity of ice $= k$ , latent heat of fusion $L_{f} = L)$ [Neglect expansion of water on freezing, $ρ$ = density of water]

Discussion

6044.	A solid non-conducting charged sphere has total charge Q and radius R. If energy stored outside the sphere is V0 joules, then find the self energy of the sphere in terms of V0.
Answer» A solid non-conducting charged sphere has total charge $Q$ and radius $R$ . If energy stored outside the sphere is $V_{0}$ joules, then find the self energy of the sphere in terms of $V_{0}$ .

Discussion

6045.	What is the magnitude of magnetic force per unit length on a wire carrying a current of 8 A and making an angle of 30º with the direction of a uniform magnetic field of 0.15 T?
Answer» What is the magnitude of magnetic force per unit length on a wire carrying a current of 8 A and making an angle of 30º with the direction of a uniform magnetic field of 0.15 T?

Discussion

6046.	Calculate the ratio of intensity of wavetrain A to wavetrain B.
Answer» Calculate the ratio of intensity of wavetrain A to wavetrain B.

Discussion

6047.	Two capacitors of capacitances C and 2C are charged to potential differences V and 2V, respectively. These are then connected in parallel in such a manner that the positive terminal of one is connected to the negative terminal of the other. The final energy of this configuration is:zero92CV2256CV232CV2
Answer» Two capacitors of capacitances $C$ and $2 C$ are charged to potential differences $V$ and $2 V$ , respectively. These are then connected in parallel in such a manner that the positive terminal of one is connected to the negative terminal of the other. The final energy of this configuration is: zero $\frac{9}{2} {CV}^{2}$ $\frac{25}{6} {CV}^{2}$ $\frac{3}{2} {CV}^{2}$

6047.

Two capacitors of capacitances C and 2C are charged to potential differences V and 2V, respectively. These are then connected in parallel in such a manner that the positive terminal of one is connected to the negative terminal of the other. The final energy of this configuration is:zero92CV2256CV232CV2

Answer»

Two capacitors of capacitances $C$ and $2 C$ are charged to potential differences $V$ and $2 V$ , respectively. These are then connected in parallel in such a manner that the positive terminal of one is connected to the negative terminal of the other. The final energy of this configuration is:

zero
$\frac{9}{2} {CV}^{2}$
$\frac{25}{6} {CV}^{2}$
$\frac{3}{2} {CV}^{2}$

Discussion

6048.	A thin ring of radius 'r' made up of a conducting material having charge 'q' .Find the increase in the tension the ring if a point charge Q is placed at centre of ring 1) Qq/8π²ε_0r² 2)Qq/4π r²ε_0 3)Qq/8π r²ε_0 4)Q/16π²r²ε_{
Answer» A thin ring of radius 'r' made up of a conducting material having charge 'q' .Find the increase in the tension the ring if a point charge Q is placed at centre of ring 1) Qq/8π²ε_0r² 2)Qq/4π r²ε_0 3)Qq/8π r²ε_0 4)Q/16π²r²ε_{

Discussion

6049.	The tangential acceleration of a particle moving in a circular path of radius 2m starting from rest varies with time as at=3t ms−2 . The centripetal acceleration (in ms−2) of the particle at t=2s is:
Answer» The tangential acceleration of a particle moving in a circular path of radius 2m starting from rest varies with time as $a_{t} = 3 t m s^{- 2}$ . The centripetal acceleration $(i n m s^{- 2})$ of the particle at t=2s is:

Discussion

6050.	A vertical cylinder closed from both ends is equipped with an easily moving piston dividing the volume into two parts, each containing one mole of air. In equilibrium at To = 300 K the volume of the upper part is 4.0 times greater than that of the lower part. At what temperature will the ratio of these volumes be equal to = 3.0?
Answer» A vertical cylinder closed from both ends is equipped with an easily moving piston dividing the volume into two parts, each containing one mole of air. In equilibrium at To = 300 K the volume of the upper part is 4.0 times greater than that of the lower part. At what temperature will the ratio of these volumes be equal to = 3.0?

Discussion

Explore topic-wise InterviewSolutions in .

14.Two springs of spring constant K each are connected in parallel to a mass m. Then they are connected in series with the same mass m. Compare frequencies of oscillation in these cases.

At relatively high pressure, van der Waals equation reduces to

A film of water is formed between two straight parallel wires each 10 cm long and at separation 0.5 cm. Calculate the work required to increase 1 mm distance between the wires. Surface tension of water=72×10−3 N/m.

Find the half angular width of the central bright maximum in the Fraunhofer diffraction pattern of a slit of width12 10- cm when the slit is illuminated by monochromatic light of wavelength 6000 A.

A body of mass 3.0 kg moves under the influence of some external force such that its position s as a function of time t is given by s=6t3−t2+1, where s is in metres and t is in seconds. The work done by the force in first three seconds is

a cell of emf E and internal resistance r is connected across a load resistance R ,the maximum power delivered in the load is

In the diagram given ahead, which bulb out of B1 and B2 will glow and why ? (b) Draw a diagram of an illumunated p-n junction solar cell. (c) Explain briefly the three processes due to which generation of emf takes place in a solar cell.

Which of the following isn’t correct for a fixed amount of ideal gas at constant volume?

A convex lens of focal length f is placed at origin. Object is placed on negative x-axis anywhere between −∞ to +∞. Choose correct graph between 'u' and 'v'.

The translational kinetic energy of all the molecules of Helium having a volume V exerting a pressure P is 1000 J. The total kinetic energy (in Joule) of all the molecules of N2 having the same volume V and exerting a pressure 2P is

A body executes SHM under action of force F1 with time period 4/5 second. If the force is changed to F2 , it has time period 3/5 second , if both F1 and F2 act simultaneously in the same direction on the body , its time period will be A. 12/25 s B. 24/25 s C. 35/24 s D. 15/24 s

A transverse wave y=5sin(3t−x), where y,x,t are in SI units, is propagating on a stretched string having density ρ=1 kg/m3. Find the intensity of propagating wave.

A projectile is fired at 30∘ with momentum p. Neglecting friction, the change in kinetic energy when it returns to the ground will be

A gas mixture consists of 2 moles of oxygen and 4 moles of argon at temperature T. Neglecting all vibrational modes, the total internal energy of the system is

A paraxial ray parallel to x− axis is incident at a point P on a parabolic reflecting surface, and the reflected ray becomes parallel to y− axis as shown in the figure. If the equation of the parabola is given by y2=2x, then the coordinates of P are

A cricketer hits a ball with a velocity 25m/s at 60 degree angle above the horizontal.how far above the ground it passes over a fielder 50m from the bat??

A bus of mass M hits a man of mass m standing on the road. If M&gt;&gt;m and initially bus was moving with 15 m/s. What will be the speed of man just after the collision? Assuming collision is perfectly elastic.

A 8kg stone tied at the end of a string 1m long is whirled in a vertical circle. At a ins†an t the string makes an angle a with vertical , the speed of stone is 4m/sec anf the tension in the thread is 104N . then a is?

A cloud is at a potential of 8×106 volts relative to the ground. A charge of 80 coulombs is transferred in lighting stroke between the cloud and the ground. Assuming the potential of the cloud to remain constant the energy dissipated is _.

†ext { If the frequency of a tuning fork is } 5000 Hz †ext { , it produces

hello,,......i had already asked this but in dint quite understand it coz it was juzt a copy from the reader..... how does the height of mountain on earth's surface depend upon the shear modulus......y is it not young's modulus? please answer as soon as possible

A body of volume V and density p is initially submerged in a non-viscous liquid of density σ(>p). If it is rises by itself through a height h in the liquid. Its kinetic energy will (a) increase by hV (σ -p)g (b) increase by hV (p + σ)g (c) decrease by hVpg/σ (d) increase by hVpg

The electron in hydrogen atom makes a transition from n=n1 to n=n2 state. The time period of the electron in the initial state is eight times that in the final state. The possible values are

The potential energy of the infinite system of charges as shown in figure will be[ Consider series expansion of ln 2 = (1−12+13−14… )]

74.What is the formula of Self energy of:- (1) Solid Sphere (2) Hollow Sphere

A body is thrown horizontally with a velocity √2gh from the top of the tower of height h. It strikes the level ground through the foot of the tower at a distance x from the tower. The value of x is

A body falling from rest describes distances S1,S2 and S3 is the 1st , 2nd and 3rd seconds of its fall .Then the ratio of S1:S2:S3 A) 1:1:1B) 1:3:5C) 1:2:3D) 1:4:9

An electric charge +q moves with velocity →v=3^i+4^j+^k in the presence of electric and magnetic fields given by →E=3^i+^j+2^k and →B=^i+^j−3^k. The y-component of the force experienced by +q is ?

The scale factor for the two drawings is given by

Write the similarities and differences between the motion of a bicycle and a ceiling fan that has been switched on.

Give equation to caoculate voltage across inductor,capacitor and resistor in series LCR circuit

Two solid balls of identical size, one of iron and another of wood are released simul†an eously from rest from the same height . If equal force of resis†an ce acts on them then which ball will reach the ground firs

As shown in the figure, a battery of emf ϵ is connected to an inductor L and resistance R in series. The switch is closed at t=0. The total charge that flows from the battery, between t=0 and t=tc (tc is the time constant of the circuit) is

The ratio of the magnetic field at the centre of a current carrying circular wire and the magnetic field at the centre of a square coil of one turn made from the same length of wire will be

Square shaped coil of side 20 cm is rotating as 60 revolutions per minute in a magnetic field of 100 T if number of turns thousands find find maximum EMF develop across the coil

Four points masses are placed at the corners of a square of side 2m . Find the centre of mass of the system with respect to the centre ofsquare, if the masses are 4kg ,1kg, 2kg , 3kg?

In the YDSE shown, the two slits are covered with thin sheets having thickness t and 2t and refractive index 2μ and μ respectively. Find the position (y) of central maxima:

A solid non-conducting charged sphere has total charge Q and radius R. If energy stored outside the sphere is V0 joules, then find the self energy of the sphere in terms of V0.

What is the magnitude of magnetic force per unit length on a wire carrying a current of 8 A and making an angle of 30º with the direction of a uniform magnetic field of 0.15 T?

Calculate the ratio of intensity of wavetrain A to wavetrain B.

A thin ring of radius 'r' made up of a conducting material having charge 'q' .Find the increase in the tension the ring if a point charge Q is placed at centre of ring 1) Qq/8π²ε_0r² 2)Qq/4π r²ε_0 3)Qq/8π r²ε_0 4)Q/16π²r²ε_{

The tangential acceleration of a particle moving in a circular path of radius 2m starting from rest varies with time as at=3t ms−2 . The centripetal acceleration (in ms−2) of the particle at t=2s is:

A bus of mass M hits a man of mass m standing on the road. If M>>m and initially bus was moving with 15 m/s. What will be the speed of man just after the collision? Assuming collision is perfectly elastic.