50278 + Interview Questions in Physics

1.	For a particle executing S.H.M. the displacement x is given by x=Acosωt. Identify the graph which represents the variation of potential energy (P.E.) as a function of time t and displacement x.
Answer» For a particle executing S.H.M. the displacement $x$ is given by $x = A cos ω t$ . Identify the graph which represents the variation of potential energy $(P.E.)$ as a function of time $t$ and displacement $x$ .

Discussion

2.	At some instant the velocity component of an electron moving between two charged parallel plates are ux=1.5×105 m/s and uy=3×106 m/s. Suppose that the electric field between the plates is given by →E=120^j N/C. What will be the velocity of the electron as its x−coordinate changes by 2 cm?(Neglect gravity)
Answer» At some instant the velocity component of an electron moving between two charged parallel plates are $u_{x} = 1.5 \times 10^{5} m/s$ and $u_{y} = 3 \times 10^{6} m/s$ . Suppose that the electric field between the plates is given by $\to E = 120^j N/C$ . What will be the velocity of the electron as its $x -$ coordinate changes by $2 cm$ ? (Neglect gravity)

Discussion

3.	Does Lami's Theorom work for more than 3 vectors ?
Answer» Does Lami's Theorom work for more than 3 vectors ?

Discussion

4.	A charged particle of charge q, mass m is projected with a velocity v=v0i. in a region of electric and magnetic field. Where E=E0k. and B=B0j. Find the initial acceleration of the particle. (1)q{E0+(v0)(B0)}k/m(2)q(v0)(B0)k/m(3)qE0k/m(4)qE0v0k/m
Answer» A charged particle of charge q, mass m is projected with a velocity v=v0i. in a region of electric and magnetic field. Where E=E0k. and B=B0j. Find the initial acceleration of the particle. (1)q{E0+(v0)(B0)}k/m (2)q(v0)(B0)k/m (3)qE0k/m (4)qE0v0k/m

Discussion

5.	The variation of magnetic susceptibility χ with absolute temperature T, for a ferromagnetic material, is best shown by which of the following graphs?
Answer» The variation of magnetic susceptibility $χ$ with absolute temperature $T$ , for a ferromagnetic material, is best shown by which of the following graphs?

Discussion

6.	A coil of inductance 300 mH and resistance 2ohm is connected to a source of voltage 2V the current reaches half of its steadystate value in(а) 0.1s(c) 0.05 s(b) 0.3s(d) 0.15snT
Answer» A coil of inductance 300 mH and resistance 2ohm is connected to a source of voltage 2V the current reaches half of its steadystate value in(а) 0.1s(c) 0.05 s(b) 0.3s(d) 0.15snT

Discussion

7.	A car of mass 1500 kg is moving with a velocity of 60 km\h. The work done by its brakes to bring it to rest is?
Answer» A car of mass 1500 kg is moving with a velocity of 60 km\h. The work done by its brakes to bring it to rest is?

Discussion

8.	A mild steel wire of length l meter cross sectional area A m^2is fixed horizontally between two pillars.A small mass m kg is suspended from the mid point of the wire.If extension in wire are within elastic limit. Then depression at the mid point of wire will be
Answer» A mild steel wire of length l meter cross sectional area A m^2is fixed horizontally between two pillars.A small mass m kg is suspended from the mid point of the wire.If extension in wire are within elastic limit. Then depression at the mid point of wire will be

Discussion

9.	a parallel plate capacitor of capacitance 90pF is connected to a battery of emf 20V. If a dielectric material of dielectric constant K=5/3 is inserted between the plates, the magnitude of the indeuced charge will be
Answer» a parallel plate capacitor of capacitance 90pF is connected to a battery of emf 20V. If a dielectric material of dielectric constant K=5/3 is inserted between the plates, the magnitude of the indeuced charge will be

Discussion

10.	The eyepiece of a refracting telescope has f=9 cm. In the normal setting, seperation between objective and eyepiece is 1.8 m. Find the magnification.
Answer» The eyepiece of a refracting telescope has $f = 9 cm$ . In the normal setting, seperation between objective and eyepiece is $1.8 m$ . Find the magnification.

Discussion

11.	A voltage of peak value 283 V and varying frequency is applied to a series L−C−R combination in which R=3 Ω;L=25 mH and C=400 μF. Then, the frequency (in Hz) of the source at which maximum power is dissipated in the above, is
Answer» A voltage of peak value $283 V$ and varying frequency is applied to a series $L - C - R$ combination in which $R = 3 Ω; L = 25 mH$ and $C = 400 μ F$ . Then, the frequency (in $H z$ ) of the source at which maximum power is dissipated in the above, is

Discussion

12.	Find the ratio pf ratio of radius, velocity, energy for n=2 of li^+2 to n=3 of he^+ ion?
Answer» Find the ratio pf ratio of radius, velocity, energy for n=2 of li^+2 to n=3 of he^+ ion?

Discussion

13.	Energy E stores in a parallel plate capacitor C1 An identical uncharged capacitor C2 is connected to it kept in contact with it for a while and then disconnected the energy stores in c2 is
Answer» Energy E stores in a parallel plate capacitor C1 An identical uncharged capacitor C2 is connected to it kept in contact with it for a while and then disconnected the energy stores in c2 is

Discussion

14.	20.The rate of flow of a liquid through a tube of length L and radius R is V.Find the rate of flow of the liquid through the combination of two tubes of the same length L but of radii R and R /2 when they are connected in 1. series and in 2.parallel Across the same pressure head.
Answer» 20.The rate of flow of a liquid through a tube of length L and radius R is V.Find the rate of flow of the liquid through the combination of two tubes of the same length L but of radii R and R /2 when they are connected in 1. series and in 2.parallel Across the same pressure head.

Discussion

15.	A pendulum suspended from the roof of an elevator at rest has a time period T1. When the elevator moves up with an acceleration ‘a′, its time period becomes T2; when the elevator moves down with an acceleration ‘a′; its time period becomes T3, then
Answer» A pendulum suspended from the roof of an elevator at rest has a time period $T_{1}$ . When the elevator moves up with an acceleration $‘ a^{'}$ , its time period becomes $T_{2}$ ; when the elevator moves down with an acceleration $‘ a^{'}$ ; its time period becomes $T_{3}$ , then

Discussion

16.	why the speed of image will be 2v when the object is stationary and mirror is moving with speed v?
Answer» why the speed of image will be 2v when the object is stationary and mirror is moving with speed v?

Discussion

17.	A thin film with index of refraction 1.33 coats a glass lens with index of refraction 1.50. Which of the following choices is the smallest film thickness that will not reflect light with wavelength 640 nm ?
Answer» A thin film with index of refraction $1.33$ coats a glass lens with index of refraction $1.50$ . Which of the following choices is the smallest film thickness that will not reflect light with wavelength $640 nm$ ?

Discussion

18.	a string is used to pull a block of mass m vertically up by a dis†an ce h at a cons†an t acceleration g/3 The work done by the tension in the string is? A) 2/3mgh B) -mgh/3 C) mgh D) 4/3mgh kindly provide the correct solution.
Answer» a string is used to pull a block of mass m vertically up by a dis†an ce h at a cons†an t acceleration g/3 The work done by the tension in the string is? A) 2/3mgh B) -mgh/3 C) mgh D) 4/3mgh kindly provide the correct solution.

Discussion

19.	67.A parallel plate capacitor having plate area 400cm2 and separation between the plates 1mm is connected to a power supply of 100V.A dielectric slab of thickness 0.5 mm and dielectric constant 5 is inserted into the gap . if the power supply is disconnected and the dielectric slab is taken out , find the increase in energy
Answer» 67.A parallel plate capacitor having plate area 400cm2 and separation between the plates 1mm is connected to a power supply of 100V.A dielectric slab of thickness 0.5 mm and dielectric constant 5 is inserted into the gap . if the power supply is disconnected and the dielectric slab is taken out , find the increase in energy

Discussion

20.	A person standing on the top of a cliff, 171 ft high, has to throw a packet to his friend standing on the ground 228 ft horizontally away. If he throws the packet directly aiming at the friend with a speed of 15.0 ft/s, how short will the packet fall? Give g = 32 ft/s2.
Answer» A person standing on the top of a cliff, $171 f t$ high, has to throw a packet to his friend standing on the ground 228 ft horizontally away. If he throws the packet directly aiming at the friend with a speed of $15.0 f t / s$ , how short will the packet fall? Give $g$ = $32 f t / s^{2}$ .

Discussion

21.	Calculate the escape velocity on the surface of the planet of 5.3 x 1020 grams, with radius 1.3 x 105 m.
Answer» Calculate the escape velocity on the surface of the planet of 5.3 x 10²⁰ grams, with radius 1.3 x 10⁵m.

Discussion

22.	Position of a particle in a rectangular-co-ordinate system is (3, 2, 5). Then its position vector will be
Answer» Position of a particle in a rectangular-co-ordinate system is (3, 2, 5). Then its position vector will be

Discussion

23.	81. Ratio of binding energy of a satellite revolving few meter above the Earth's surface and same satellite rest on Earth is ??
Answer» 81. Ratio of binding energy of a satellite revolving few meter above the Earth's surface and same satellite rest on Earth is ??

Discussion

24.	ntA grenade having mass of 10kg flying horizontally with a velocity 0f 10m/s explodes into two fragments .the larger fragment has a velocity 25 m/s in the direction of initial velocity of grenade the smaller fragment has a velocity of 12.5 m/s in the opposite direction .The masses of fragments are ?n
Answer» ntA grenade having mass of 10kg flying horizontally with a velocity 0f 10m/s explodes into two fragments .the larger fragment has a velocity 25 m/s in the direction of initial velocity of grenade the smaller fragment has a velocity of 12.5 m/s in the opposite direction .The masses of fragments are ?n

Discussion

25.	The inside diameters of the two arms of a U-tube are 1.00 mm and 1.5 mm respectively. Now if it is partially filled with water having surface tension of 0.078N/m and zero contract angle, there what will be the difference in the level of menisci between the two arms?
Answer» The inside diameters of the two arms of a U-tube are $1.00 m m$ and $1.5 m m$ respectively. Now if it is partially filled with water having surface tension of $0.078 N / m$ and zero contract angle, there what will be the difference in the level of menisci between the two arms?

Discussion

26.	A taxi leaves the station X for station Y every 10 minutes. Simultaneously, a taxi leaves the station Y also for station X every 10 minutes. The taxis move at the same constant speed and go from X to Y or vice-versa in 2 hours. How many taxis coming from the other side will each taxi meet enroute from Y to X? (1) 10 (2) 11 (3) 12 (4) 23
Answer» A taxi leaves the station X for station Y every 10 minutes. Simultaneously, a taxi leaves the station Y also for station X every 10 minutes. The taxis move at the same constant speed and go from X to Y or vice-versa in 2 hours. How many taxis coming from the other side will each taxi meet enroute from Y to X? (1) 10 (2) 11 (3) 12 (4) 23

Discussion

27.	33. The ratio of the power developed across 10 ohm and 20 ohm and 60 ohm will be.?( if emf E of battery is 40 V and total power supplied by an ideal battery is 80 W )
Answer» 33. The ratio of the power developed across 10 ohm and 20 ohm and 60 ohm will be.?( if emf E of battery is 40 V and total power supplied by an ideal battery is 80 W )

Discussion

28.	Two equal point charges are fixed at x=−a and x=+a on the axis. Another point charge Q is placed at the origin. The change in the electrical potential energy of Q, when it is displaced by a small distance x along the x–axis, is approximately proportional to-
Answer» Two equal point charges are fixed at $x = - a$ and $x = + a$ on the axis. Another point charge $Q$ is placed at the origin. The change in the electrical potential energy of $Q$ , when it is displaced by a small distance x along the $x -$ axis, is approximately proportional to-

Discussion

29.	If velocity of a particle is v(t)=(5t−10) m/s, the average speed and magnitude of average velocity of the particle in 4 sec respectively are
Answer» If velocity of a particle is $v (t) = (5 t - 10) m/s$ , the average speed and magnitude of average velocity of the particle in $4 sec$ respectively are

Discussion

30.	ntGraph between log x/m and log p is a straight line at an angle 45 degree with intercept on y-axis0.3010. Calculate the amount of gas adsorbed in gram per gram of the adsorbent when pressure is 0.2 atm. 1) 0.4 2)0.6 3)0.8 4)0.2n
Answer» ntGraph between log x/m and log p is a straight line at an angle 45 degree with intercept on y-axis0.3010. Calculate the amount of gas adsorbed in gram per gram of the adsorbent when pressure is 0.2 atm. 1) 0.4 2)0.6 3)0.8 4)0.2n

Discussion

31.	A charge Q is uniformly distributed over a rod of length 2l. Consider cube of edge l with the centre of cube at one end of the rod.The minimum possible electric flux through the surface of the cube is
Answer» A charge Q is uniformly distributed over a rod of length 2l. Consider cube of edge l with the centre of cube at one end of the rod.The minimum possible electric flux through the surface of the cube is

Discussion

32.	A series RLC circuit contains resistance of 10Ω, an inductance of 0.2H and a capacitor of 100uF .. Its powered by a supply of 200V, 50Hz. Calculate the total circuit impedance, the circuits current, power factor and draw the voltage phasor diagram.
Answer» A series RLC circuit contains resistance of 10Ω, an inductance of 0.2H and a capacitor of 100uF .. Its powered by a supply of 200V, 50Hz. Calculate the total circuit impedance, the circuits current, power factor and draw the voltage phasor diagram.

Discussion

33.	A charged particle of mass m and charge q is projected on a rough horizontal xy-plane surface with z-axis in the vertically upward direction. Both electric and magnetic fields are acting in the region is given by →E = −E0^k and →B = −B0^k respectively. The particle enters into the field at (a,0,0) with velocity →v = v0^j. The particle starts moving into a circular path on the plane. If the coefficient of friction between the particle and the plane is μ. Then calculate the time when the particle will come to rest ?
Answer» A charged particle of mass $m$ and charge $q$ is projected on a rough horizontal $x y$ -plane surface with $z$ -axis in the vertically upward direction. Both electric and magnetic fields are acting in the region is given by $\to E$ = $- E_{0}^k$ and $\to B$ = $- B_{0}^k$ respectively. The particle enters into the field at $(a, 0, 0)$ with velocity $\to v$ = $v_{0}^j$ . The particle starts moving into a circular path on the plane. If the coefficient of friction between the particle and the plane is $μ$ . Then calculate the time when the particle will come to rest ?

Discussion

34.	Let x[n] be discrete time signal whose discrete time Fourier transform is represented as X(ejω)=e−jωM2sin(ωN2)sin(ω2) and x[n] is represented as shown below.Then the value of (M×N) is________.30
Answer» $Let x[n] be discrete time signal whose discrete time Fourier transform is represented as X (e^{j ω}) = e^{\frac{- j ω M}{2}} \frac{sin (\frac{ω N}{2})}{sin (\frac{ω}{2})} and x[n] is represented as shown below.$ $Then the value of (M \times N) is________.$ 30

Discussion

35.	Air is filled in a bottle and it is corked at 35 degree celsius. If the cork can come out at 3 atmospheric pressure then upto what temperature should the bottle be heated in order to rempove the cork
Answer» Air is filled in a bottle and it is corked at 35 degree celsius. If the cork can come out at 3 atmospheric pressure then upto what temperature should the bottle be heated in order to rempove the cork

Discussion

36.	A simple pendulum pulled a side through an angle θ and released. The tension at the mean position is 1) mg(3 + 2cos θ) 2) mg(3 – 2cosθ) 3) mg(3 – cos θ) 4) mg(2 – cos θ)
Answer» A simple pendulum pulled a side through an angle θ and released. The tension at the mean position is 1) mg(3 + 2cos θ) 2) mg(3 – 2cosθ) 3) mg(3 – cos θ) 4) mg(2 – cos θ)

Discussion

37.	A load is to be moved using a wheelbarrow. The total mass of the load and the wheelbarrow is 60kg. The magnitude of gravitational acceleration is 10m/s2. What is the work done if the handle is raised by 100cm? A 350J B 17.5 J C 175J D 35J
Answer» A load is to be moved using a wheelbarrow. The total mass of the load and the wheelbarrow is 60kg. The magnitude of gravitational acceleration is 10m/s2. What is the work done if the handle is raised by 100cm? A 350J B 17.5 J C 175J D 35J

37.

A load is to be moved using a wheelbarrow. The total mass of the load and the wheelbarrow is 60kg. The magnitude of gravitational acceleration is 10m/s2. What is the work done if the handle is raised by 100cm? A 350J B 17.5 J C 175J D 35J

Answer»

A load is to be moved using a wheelbarrow. The total mass of the load and the wheelbarrow is 60kg. The magnitude of gravitational acceleration is 10m/s2. What is the work done if the handle is raised by 100cm?

A 350J

B 17.5 J

C 175J

D 35J

Discussion

38.	A particle is thrown vertically upward find its velocity so that covers same distance in 5th and6th seconds
Answer» A particle is thrown vertically upward find its velocity so that covers same distance in 5th and6th seconds

Discussion

39.	Young's double slit experiment is performed in a liquid medium. The 10th bright fringe in liquid lies where 6th dark fringe lies in vacuum. The refractive index of the liquid is approximately,
Answer» Young's double slit experiment is performed in a liquid medium. The $10^{th}$ bright fringe in liquid lies where $6^{th}$ dark fringe lies in vacuum. The refractive index of the liquid is approximately,

Discussion

40.	A glass tube,sealed at both ends ,is 100cm long .it lies horizontally with the middle 10cm containing mercury.the two ends of the tube contain air at 27degreeC. and at a pressure 76cm of mercury.the air column on one side is maintained at 0degreeC and the other side is maintained at 127degreeC.calcyulate the length of the air column on the cooler side.neglect the changes in the volume of mercury and of the glass.
Answer» A glass tube,sealed at both ends ,is 100cm long .it lies horizontally with the middle 10cm containing mercury.the two ends of the tube contain air at 27degreeC. and at a pressure 76cm of mercury.the air column on one side is maintained at 0degreeC and the other side is maintained at 127degreeC.calcyulate the length of the air column on the cooler side.neglect the changes in the volume of mercury and of the glass.

Discussion

41.	Choose the correct statements(s) from the following:
Answer» Choose the correct statements(s) from the following:

Discussion

42.	The magnitude of change in velocity of a particle having speed v during a time interval delt while moving in a uniform circular motion the magnitude of average force on the particle is proportional to
Answer» The magnitude of change in velocity of a particle having speed v during a time interval delt while moving in a uniform circular motion the magnitude of average force on the particle is proportional to

Discussion

43.	An alternating current of rms value of 5A is passed through a 10 ohm resistor. The maximum potential difference across the resistor is nearly
Answer» An alternating current of rms value of 5A is passed through a 10 ohm resistor. The maximum potential difference across the resistor is nearly

Discussion

44.	17. A galvanometer of resistance 30 ohm is connected to 2V battery along with a resistance of 2000 ohm in series .A full scale deflection of 25 division is obtained .In order to reduce the division to 20 the resistance in series should be 1.2470 ohm 2.2345ohm 3. 2370ohm 4.2570ohm
Answer» 17. A galvanometer of resistance 30 ohm is connected to 2V battery along with a resistance of 2000 ohm in series .A full scale deflection of 25 division is obtained .In order to reduce the division to 20 the resistance in series should be 1.2470 ohm 2.2345ohm 3. 2370ohm 4.2570ohm

Discussion

45.	Suppose the energy liberated in the recombination of a hole-electron pair is converted into electromagnetic radiation. If the maximum wavelength emitted is 820 nm, what is the band gap ?
Answer» Suppose the energy liberated in the recombination of a hole-electron pair is converted into electromagnetic radiation. If the maximum wavelength emitted is 820 nm, what is the band gap ?

Discussion

46.	A radioactive sample has an average life of 30 ms and is decaying. A capacitor of capacitance 200 μF is first charged and later connected with resistor ′R′. If the ratio of charge on capacitor to the activity of radioactive sample is fixed with respect to time then the value of ′R′ should be _____Ω.
Answer» A radioactive sample has an average life of $30 ms$ and is decaying. A capacitor of capacitance $200 μ F$ is first charged and later connected with resistor $^{'} R^{'}$ . If the ratio of charge on capacitor to the activity of radioactive sample is fixed with respect to time then the value of $^{'} R^{'}$ should be _____ $Ω$ .

Discussion

47.	If ∫cosxcos2xcos3x dx=Asin6x+Bsin4x+Psin2x+Qx+C(where C is constant of integration), then which of the following is/are true:
Answer» If $\int cos x cos 2 x cos 3 x d x = A sin 6 x + B sin 4 x + P sin 2 x + Q x + C$ $($ where $C$ is constant of integration $),$ then which of the following is/are true:

Discussion

48.	A ball of mass m moves with speed v and strikes a wall having infinite mass and it returns with same speed then the work done by the ball on the wall is
Answer» A ball of mass m moves with speed v and strikes a wall having infinite mass and it returns with same speed then the work done by the ball on the wall is

Discussion

49.	A sphere of mass 'm' moving with a constant velocity 'u' hits another stationary sphere of the same mass. If 'e' is the coefficient of restitution, then the ratio of the velocity of two spheres after collision will be
Answer» A sphere of mass 'm' moving with a constant velocity 'u' hits another stationary sphere of the same mass. If 'e' is the coefficient of restitution, then the ratio of the velocity of two spheres after collision will be

Discussion

50.	An iron casting containing a number of cavities weighs 16000 N in air and 12000 N in water. Volume of the cavities in the casting is -[ take density of iron =8000 kg/m3 & g=10 m/s2]
Answer» An iron casting containing a number of cavities weighs $16000 N$ in air and $12000 N$ in water. Volume of the cavities in the casting is - [ take density of iron $= 8000 {kg/m}^{3}$ & $g = 10 {m/s}^{2}$ ]

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

For a particle executing S.H.M. the displacement x is given by x=Acosωt. Identify the graph which represents the variation of potential energy (P.E.) as a function of time t and displacement x.

Does Lami's Theorom work for more than 3 vectors ?

A charged particle of charge q, mass m is projected with a velocity v=v0i. in a region of electric and magnetic field. Where E=E0k. and B=B0j. Find the initial acceleration of the particle. (1)q{E0+(v0)(B0)}k/m(2)q(v0)(B0)k/m(3)qE0k/m(4)qE0v0k/m

The variation of magnetic susceptibility χ with absolute temperature T, for a ferromagnetic material, is best shown by which of the following graphs?

A coil of inductance 300 mH and resistance 2ohm is connected to a source of voltage 2V the current reaches half of its steadystate value in(а) 0.1s(c) 0.05 s(b) 0.3s(d) 0.15snT

A car of mass 1500 kg is moving with a velocity of 60 km\h. The work done by its brakes to bring it to rest is?

A mild steel wire of length l meter cross sectional area A m^2is fixed horizontally between two pillars.A small mass m kg is suspended from the mid point of the wire.If extension in wire are within elastic limit. Then depression at the mid point of wire will be

a parallel plate capacitor of capacitance 90pF is connected to a battery of emf 20V. If a dielectric material of dielectric constant K=5/3 is inserted between the plates, the magnitude of the indeuced charge will be

The eyepiece of a refracting telescope has f=9 cm. In the normal setting, seperation between objective and eyepiece is 1.8 m. Find the magnification.

A voltage of peak value 283 V and varying frequency is applied to a series L−C−R combination in which R=3 Ω;L=25 mH and C=400 μF. Then, the frequency (in Hz) of the source at which maximum power is dissipated in the above, is

Find the ratio pf ratio of radius, velocity, energy for n=2 of li^+2 to n=3 of he^+ ion?

Energy E stores in a parallel plate capacitor C1 An identical uncharged capacitor C2 is connected to it kept in contact with it for a while and then disconnected the energy stores in c2 is

20.The rate of flow of a liquid through a tube of length L and radius R is V.Find the rate of flow of the liquid through the combination of two tubes of the same length L but of radii R and R /2 when they are connected in 1. series and in 2.parallel Across the same pressure head.

A pendulum suspended from the roof of an elevator at rest has a time period T1. When the elevator moves up with an acceleration ‘a′, its time period becomes T2; when the elevator moves down with an acceleration ‘a′; its time period becomes T3, then

why the speed of image will be 2v when the object is stationary and mirror is moving with speed v?

A thin film with index of refraction 1.33 coats a glass lens with index of refraction 1.50. Which of the following choices is the smallest film thickness that will not reflect light with wavelength 640 nm ?

a string is used to pull a block of mass m vertically up by a dis†an ce h at a cons†an t acceleration g/3 The work done by the tension in the string is? A) 2/3mgh B) -mgh/3 C) mgh D) 4/3mgh kindly provide the correct solution.

A person standing on the top of a cliff, 171 ft high, has to throw a packet to his friend standing on the ground 228 ft horizontally away. If he throws the packet directly aiming at the friend with a speed of 15.0 ft/s, how short will the packet fall? Give g = 32 ft/s2.

Calculate the escape velocity on the surface of the planet of 5.3 x 1020 grams, with radius 1.3 x 105 m.

Position of a particle in a rectangular-co-ordinate system is (3, 2, 5). Then its position vector will be

81. Ratio of binding energy of a satellite revolving few meter above the Earth's surface and same satellite rest on Earth is ??

The inside diameters of the two arms of a U-tube are 1.00 mm and 1.5 mm respectively. Now if it is partially filled with water having surface tension of 0.078N/m and zero contract angle, there what will be the difference in the level of menisci between the two arms?

33. The ratio of the power developed across 10 ohm and 20 ohm and 60 ohm will be.?( if emf E of battery is 40 V and total power supplied by an ideal battery is 80 W )

Two equal point charges are fixed at x=−a and x=+a on the axis. Another point charge Q is placed at the origin. The change in the electrical potential energy of Q, when it is displaced by a small distance x along the x–axis, is approximately proportional to-

If velocity of a particle is v(t)=(5t−10) m/s, the average speed and magnitude of average velocity of the particle in 4 sec respectively are

ntGraph between log x/m and log p is a straight line at an angle 45 degree with intercept on y-axis0.3010. Calculate the amount of gas adsorbed in gram per gram of the adsorbent when pressure is 0.2 atm. 1) 0.4 2)0.6 3)0.8 4)0.2n

A charge Q is uniformly distributed over a rod of length 2l. Consider cube of edge l with the centre of cube at one end of the rod.The minimum possible electric flux through the surface of the cube is

A series RLC circuit contains resistance of 10Ω, an inductance of 0.2H and a capacitor of 100uF .. Its powered by a supply of 200V, 50Hz. Calculate the total circuit impedance, the circuits current, power factor and draw the voltage phasor diagram.

Let x[n] be discrete time signal whose discrete time Fourier transform is represented as X(ejω)=e−jωM2sin(ωN2)sin(ω2) and x[n] is represented as shown below.Then the value of (M×N) is________.30

Air is filled in a bottle and it is corked at 35 degree celsius. If the cork can come out at 3 atmospheric pressure then upto what temperature should the bottle be heated in order to rempove the cork

A simple pendulum pulled a side through an angle θ and released. The tension at the mean position is 1) mg(3 + 2cos θ) 2) mg(3 – 2cosθ) 3) mg(3 – cos θ) 4) mg(2 – cos θ)

A load is to be moved using a wheelbarrow. The total mass of the load and the wheelbarrow is 60kg. The magnitude of gravitational acceleration is 10m/s2. What is the work done if the handle is raised by 100cm? A 350J B 17.5 J C 175J D 35J

A particle is thrown vertically upward find its velocity so that covers same distance in 5th and6th seconds

Young's double slit experiment is performed in a liquid medium. The 10th bright fringe in liquid lies where 6th dark fringe lies in vacuum. The refractive index of the liquid is approximately,

Choose the correct statements(s) from the following:

The magnitude of change in velocity of a particle having speed v during a time interval delt while moving in a uniform circular motion the magnitude of average force on the particle is proportional to

An alternating current of rms value of 5A is passed through a 10 ohm resistor. The maximum potential difference across the resistor is nearly

17. A galvanometer of resistance 30 ohm is connected to 2V battery along with a resistance of 2000 ohm in series .A full scale deflection of 25 division is obtained .In order to reduce the division to 20 the resistance in series should be 1.2470 ohm 2.2345ohm 3. 2370ohm 4.2570ohm

Suppose the energy liberated in the recombination of a hole-electron pair is converted into electromagnetic radiation. If the maximum wavelength emitted is 820 nm, what is the band gap ?

If ∫cosxcos2xcos3x dx=Asin6x+Bsin4x+Psin2x+Qx+C(where C is constant of integration), then which of the following is/are true:

A ball of mass m moves with speed v and strikes a wall having infinite mass and it returns with same speed then the work done by the ball on the wall is

A sphere of mass 'm' moving with a constant velocity 'u' hits another stationary sphere of the same mass. If 'e' is the coefficient of restitution, then the ratio of the velocity of two spheres after collision will be

An iron casting containing a number of cavities weighs 16000 N in air and 12000 N in water. Volume of the cavities in the casting is -[ take density of iron =8000 kg/m3 &amp; g=10 m/s2]

An iron casting containing a number of cavities weighs 16000 N in air and 12000 N in water. Volume of the cavities in the casting is -[ take density of iron =8000 kg/m3 & g=10 m/s2]