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Physics Questions and Answers November 04, 2022

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A wooden cylinder of diameter 4r, height h and density p3 is kept on a hole of diameter 2r of a tank, filled with water of density p as shown in the figure. The height of the base of cylinder from the base of tank is H. Find the number of times y y 0 at x 0 in 1 sec (A) 100 (C) 192 (B) 46 (D) 96 h H h 2r p3

Modern trains are based on Maglev technology in which trains are magnetically levitated, which runs its EDS Maglev system. There are coils on both sides of wheels. Due to motion of train, current induces in the coil of track which levitates it. This is in accordance with Lenzs law. If trains lower down then due to Lenzs law a repulsive force

There is a rectangular plate of mass M kg of dimensions (a x b). The plate is held in horizontal position by striking n small balls each of mass m per unit area per unit time. These are striking in the shaded half region of the plate. The balls are colliding elastically with velocity v. What is v It is given n 100, M 3 kg, m 0.01 kg b 2 m a

In an insulated vessel, 0.05 kg steam at 373 K and 0.45 kg of ice at 253 K are mixed. Then, find the final temperature of the mixture. Given, Lfusion 80 calg 336 Jg, Lvaporization 540 calg 2268 Jg, Sice 2100 Jkg K 0.5 calgK and Swater 4200 Jkg K 1 calgK

In hydrogenlike atom (z 11), nt line of Lyman series has wavelength equal to the deBroglies wavelength of electron in the level from which it originated. What is the value of n

A circular disc with a groove along its diameter is placed horizontally. A block of mass 1 kg is placed as shown. The coefficient of friction between the block and all surfaces of groove in contact is 25. The disc has an acceleration of 25 ms. Find the acceleration of the block with respect to disc. a 25 ms (D cos 0 45 sin 0 35

Heat given to process is positive, match the following option of column I with the corresponding option of column II Column I Column II (A) JK (P) AW 0 (B) KL (Q) AQ 0 (C) LM (R) AW 0 (D) MJ (S) Q 0 P(atm) 30 20 10 J Ki 10 M 20 V(m)

What types of AC voltage capacitors are available

What are the applications of AC voltage capacitors?

What is an approximate value for the speed of sound in air Options 1)30 ms 2) 300 ms 3)30000 ms 4)300000000 ms

A person standing between two parallel hills fires a gun. He hears the first echo after 1.5 sec, and the second echo after 2.5 sec. If the speed of sound is 332 ms, calculate the distance between the hills. When will you hear the third echo Options 1)4sec 2) 5sec 3)6sec 4)2sec

The ultimate source of hydroelectric energy is Options 1)Potential energy of water 2) Kinetic energy of water 3)Solar energy 4)Chemical energy

The speed of a boat in still water is 15 kmhr. It goes 30 km upstream and returns downstream to its original point in 4 hour 30 minutes. Find the speed of the stream (in kmhr). Options 1)5 kmhr 2) 6 kmhr 3)8 kmhr 4)5 kmhr

A train of length 50 m is moving with a constant speed of 10 ms. Find the time taken by the train to cross an electric pole and a bridge of length 250 m. Options 1)30 sec and 20 sec 2) 5 sec and 30 sec 3)5 sec and 45 sec 4)5 sec and 15 sec

A train 125m long passes a man running at 5kmhr in the same direction in which the train is going in 10sec. fillnumerical the speed of the train.

A timekeeper in a 100m run is advised to start the stopwatch by seeing the smoke from the starters gun and not by hearing the sound of fire. Options 1)true 2) false

How does an astronomer calculate the distance of a star Options 1)Comparing apparent brightness of star to true brightness 2) Comparing true brightness of star to apparent br brightness 3)Comparing true brightness of the stars to true brightness 4)None

Ursa major Options 1)Big Dipper 2) Leo Major 3)Great bear 4)Saptarshi Orion Hunter

are the result of exploding stars that initially are more than about eight times the suns mass. Options 1)Stars 2) Black hole 3)SuperNova 4)None of these

Distance from Earth to Proxima Centauri, the next nearest star is Options 1)4.24 light years 2) 5.5 light years 3)4.0 light years 4)3.5 light years light years.

Which area of the Earth receives maximum sunlight Options 1) Polar region 2) Equatorial region 3)Along the latitude of tropic of cancer 4)Along the latitude of tropic of Capricorn

The biggest source of energy on earths surface is Options 1)Biomass 2) Solar Radiation 3)Tides 4)Winds

A golf ball has a diameter equal to 4.2 cm. Its surface has 200 dimples each of a radius of 2 mm. Find is the total surface area which is exposed to the surroundings assuming that the dimples are hemispherical. Options 1)80.58cm 2)90.58cm 3)60.58cm 4)85.58cm

When the temperature of a gas contained in a closed vessel is increased by 5C, its pressure increases by 1. The original temperature of the gas was approximately Options 1)500C 2) 273C 3)227C 4)250C

At what temperature, does the temperature in Celsius and Fahrenheit scales equalize. Options 1)40 2) 40 3)36.6 4)38

The normal temperature of the human body is 37 C.What will be its value on the Fahrenheit scale. Options 1)66.6F 2) 45F 3)57F 4)77F

Convert 25 C temperature difference into Fahrenheit scale. Options 1)25F 2) 45F 3)57F 4)77F

Convert 75C into Kelvin. Options 1)293.15K 2) 393.15K 3)493.15K 4)193.15K

Water flows in a horizontal pipe is a streamlined pressure of 4x105 Pa manner at an absolute and Speed of 6 ms. If it exits the pipe at of 10 Pa, the at the is ms. (The density of water Pressure exit point is 1000 kgm). of water speed of

In Boolean terms, (AB)(AC) is equal to (a) ABC (c) A(BC) (b) (ABC)(AB) (d) ABC

Show how to solve the timeindependent Schrdinger equation to get eigenvalues (energy levels) and eigenfunctions (wavefunctions) for a particle in a 1dimensional box of length L (boundary condition V(x)0 when 0,Physical constants Planck constant h 6.626 x 1034 J.S Speed of light c 2.998 108 ms Please use the correct significant figures and units

A particle moves in a circular path with decreasing speed. Choose the correct statement F (a) Angular momentum remains constant (b) Acceleration (a) is towards the centre (c) Particle moves in a spiral path with decreasing radius (d) The direction of angular momentum remains constant

A block of mass m is at rest under the action of force F against a wall as shown in figure. Which of the following statement is incorrect (a) f mg where fis the frictional force (b) F N where N is the normal force (c) F will not produce torque (d) N will not produce torque F

A simple pendulum has time period T.. The point of suspension is now moved upward according to the relation y Kt, (K 1 ms) where y is the vertical displacement. The time period now becomes T2. The ratio of (T)(T) is (g 10 ms). (a) 65 (b) 56 (c) 1 (d) 45

From a circular disc of radius R and mass 9M, a small disc of radius R3 is removed from the disc. The moment of inertia of the remaining disc about an axis perpendicular to the plane of the disc and passing through O is R3 R 0 (a) 4MR (b) 409 MR (c) 10 MR (d) 379 MR 2R3

Electromagnetic waves transport energy. This problem shows you which parts of the energy are stored in the electric and magnetic fields, respectively, and also makes a useful connection between the energy density of a plane electromagnetic wave and the Poynting vector. In this problem, we explore the properties of a plane electromagnetic wave

Which of the following sets have different dimensions (a) Pressure, Youngs modulus, Stress (b) Emf, Potential difference, Electric potential (c) Heat, Work done, Energy (d) Dipole moment, Electric flux, Electric field

A photon collides with a stationary hydrogen atom in ground state inelastically. Energy of the colliding photon is 10.2 eV. After a time interval of the order of micro second another photon collides with same hydrogen atom inelastically with an energy of 15 eV. What will be observed by the detector (a) 2 photon of energy 10.2 eV (b) 2 photon of

A moving coil galvanometer of resistance 100 is used as an ammeter using a resistance 0.1 2. The maximum deflection current in the galvanometer is 100 A. Find the minimum current in the circuit so that the ammeter shows maximum deflection (a) 100.1 mA (b) 1000.1 MA (c) 10.01 MA (d) 1.01 mA

The pressure of a medium is changed from 1.01 x 10 Pa to 1.165 x 10 Pa and change in volume is 0 keeping temperature constant. The Bulk modulus of the medium is (a) 204.8 x 10 Pa (b) 102.4 x 10 Pa (c) 51.2 x 10 Pa (d) 1.65 x 10 Pa

An open pipe is in resonance in 2nd harmonic with frequency f.. Now one end of the tube is closed and frequency is increased to f such that the resonance again occurs in nth harmonic. Choose the correct option (a) n 3, f 34 f (b) n 3, fi 54f (c) n 5, f 54 f (d) n 5, f 34 fi

Water of volume 2 litre in a container is heated with a coil of 1kW at 27C. The lid of the container is open and energy dissipates at rate of 160 Js. In how much time temperature will rise from 27C to 77 C Given specific heat of water is 4.2 kJkg (a) 8 min 20 s (b) 6 min 2 s (c) 7 min (d) 14 min

Water is filled in a cylindrical container to a height of 3 m. The ratio of the cross sectional area of the orifice and the beaker is 0.1. The square of the speed of the liquid coming out from the orifice is (g 10 ms) 11 3m (a) 50 ms (b) 50.5 ms (c) 51 ms (d) 52 ms 5250

In which of the following process, convection does not take place primarily (a) sea and land breeze (b) boiling of water (c) warming of glass of bulb due to filament (d) heating air around a furnace

A container is filled with water ( 1.33) up to a height of 33.25 cm. A concave mirror is placed 15 cm above the water level and the image of an object placed at the bottom is formed 25 cm below the water level. The focal length of the mirror is 15 cm 00 1.33 33 25 cm (a) 10 cm (b) 15 cm (c) 19 cm (d) 25 cm

Variation of radiant energy emitted by sun, filament of tungsten lamp and welding arc as a function of its wavelength is shown in figure. Which of the following option is the correct match T (a) SunT, tungsten filamentT., welding arcT, (b) SunTz, tungsten filamentT., welding arcT. (c) SunT, tungsten filamentT., welding arcT (d) SunT, tungsten

Calorie is defined as the amount of heat required to raise temperature of 1 g of water by 1C and it is defined under which of the following conditions (a) From 14.5C to 15.5C at 760 mm of Hg (b) From 98.5C to 99.5C at 760 mm of Hg (c) From 13.5C to 14.5C at 76 mm of Hg (d) From 3.5C to 4.5 C at 76 mm of Hg

A convex lens is in contact with concave lens. The magnitude of the ratio of their focal length is 23. Their equivalent focal length is 30 cm. What are their individual focal lengths (a) 75, 50 (b)10, 15 (c) 75, 50 (d)15, 10

K. wavelength emitted by an atom of atomic number Z 11 is . Find the atomic number for an atom that emits K. radiation with wavelength 42. (a) Z 6 (b) Z4 (c) Z11 (d) Z 44

A rigid container with thermally insulated walls contains a coil of resistance 10002, carrying current 1A. Change in internal energy after 5 minute will be (a) 6 kJ (b) 10 kJ (c) 20 kJ (d) 30 kJ

A beam of electron is used in an YDSE experiment. The slit width is d. When the velocity of electron is increased, then (a) no interference is observed (b) fringe width increases (c) fringe width decreases (d) fringe width remains same

A tuning fork of 512 Hz is used to produce resonance in a resonance tube experiment. The level of water at first resonance is 30.7 cm and at second resonance is 63.2 cm. The error in calculating velocity of sound is (a) 204.1 cms (b) 110 cms (c) 58 cms (d) 280 cms

A 4F capacitor, a resistance of 2.5 M2 is in series with 12 V battery. Find the time after which the potential difference across the capacitor is 3 times the potential difference across the resistor. Given In (2) 0.693 (a) 13.86 s (b) 6.93 s (c) 7 s (d) 14 s

An infinitely long cylinder is kept parallel to an uniform magnetic field B directed along positive z axis. The direction of induced current as seen from the z axis will be (a) clockwise of the ve z axis (b) anticlockwise of the ve z axis (c) zero (d) along the magnetic field

If a star can convert all the He nuclei completely into oxygen nuclei. The energy released per oxygen nuclei is Mass of the nucleus is 4.0026 amu and mass of oxygen nucleus is 15.9994 amu (a) 7.6 MeV (b) 56.12 MeV (c) 10.24 MeV (d) 23.9 MeV

A body with area A and temperature T and emissivity e 0.6 is kept inside a spherical black body. What will be the maximum energy radiated (a) 0.60 eAT (b) 0.80 eAT (c) 1.00 e AT www (d) 0.40 eAT

For a transistor amplifier, the frequency response is such that the mid hand voltage gain is 200. The cutoff frequencies are 20 Hz and 20 kHz. What is the ratio (rounded off to two decimal places) of the voltage gain at 10 Hz to that at 100 kHz

A long solenoid is driven by an alternating current so that the axial field inside varies with time according to B (t) Bo cos (cor). A small circular loop of radius a and resistance R is placed coaxial inside the solenoid. The average power dissipated in the loop is 2 24 O Bowra 2R 2 2 2 2 2R Bowna R O zero

A left circularly polarised electromagnetic wave with wavelength 5000A is incident normally on a calcite crystal. The refractive index for Ewave and Owave are n 1.554 and no 1.544 respectively. The thick ness of the crystal so that emergent light is right circularly polarised is 2.5m 0 12.5 m 01.25 m 025 m

Consider a square waveguide of sides a. It is transmit an electromagnetic wave of wavelength in TE10 mode but not in the TE or TM, modes. The limiting range of values of a is

Consider a region of space in which there are uniform electric field E 32 Vm and magnetic field B 1T, which are parallel to each other. A proton is thrown into this region with speed v 1 msec making angle 60 with fields. The power radiated by the charge particle is (where e and m, are charge and mass of proton respectively). Hoe 4 3 2 127c m 0 3

t Consider the U23 nucleus having a radius R 6.631015m. The charge distribution inside the nucleus is given by p (r) ar. The value of a is (in Cm) O 2.43103 O2.431039 O2.43x1035 zero

A long solenoid having n turns per unit length and radius R carries a current I Io sin cor. The displacement current density at a distance r from the axis with in solenoid is given by O ro 2c 7nIo sin (cot) ro 2 2c no sin (cot) 2c Io cos (cwt) wr 2c nIo cos (at)

Consider an infinite solenoid with circular crosssection of radius R with N turns per unit length carrying a steady current I. The magnetic vector potential is given by The value of m and n are Om1. n1 Om0.n0 Om1, n 1 Om1, n 0m for r R for r R

Consider an infinitely long wire carrying charge per unit length. An observer moving with velocity 0.6c parallel to length of the wire at a perpendicular distance d from the wire. The observer will measure the electric field as O 520 Sod ioa 470 10 O zero

Consider two coaxial circular loops of wire of radii a and b separated by a distance x and carrying I1 and I2 respectively. Assuming b a. The force between two loops is 3zoab111,x 2(a x2) 52 ab11,x (a2x2) 52 O ol ax 2(a2x2)52 zero

An electromagnetic wave propagating in a medium which propagation vector is given k (33)m. Which of the following state is correct. lags behind by an phase angle with skin depth 6 m 6 1 lags behind by an phase angle with skin depth 6 m E lags behind H by an phase angle with skin depth 3 m 6 Hlags behind E by an phase angle with skin depth 6 3 m

The electrons moves with relativistic speeds on graphene sheet and assumed to follow the dispersion relation (k) vk (where v is constant) over the entire kspace, then the dependence of Fermi temperature (7) on electron density (n) is 12 OTF on O IF on O TF C 13 In OTFn3

The Fermi surface of copper is distinctly nonspherical. The diameter of a free electron Fermisphere in a mono valent metal with an FCC structure is 127 a (3 a 967 23 13 13 13 (127) 3 a

Aphoton of wavelength . when absorbed by a 2D rigid rotor. takes it from first excited state to the third excited state. The moment of inertia of the rotor about its axis is. O h 87C O 5 h 8C O ha 27C O ha 2

Consider 3 spin1 particles, called 1. 2. 3 with spin operators S. S and S3, respectively. The particles are placed along a circle. The Hamiltonian takes the form H (5. with A0 a constant with units of energy. The number of degeneracy corresponding energy 2A is 01 3 5 55 04 05 5 S5)

Consider a rotational operator R. (a) R(a)y (r.0,0)y (r.0.0a) The value of R. (a), x is O zero O iaL Le,O O a L, e ia L iaL aye

Consider a ypolarized electromagnetic wave EyE, cos (cotkx) incident normally on the interface of a dielectric and a perfect conductor (a). The standing wave due to superposition of reflected and incident wave is given by O22E cos(kx) cos(cot) O y2E cos(kx) cos(cot) Oy2E sin(kx) cos(at) Oy2E sin(kx) sin(cot)

Consider A and V are vector and scalar potential A(r.t)gr.V(r.t) 0 and a scalar fiuction . Due to Gauge transformation, the transformed potential are 4 V(r.t) 0, A(r.t) . 4 V(r,t) 2 (rt) V(r.t) V(r.t) (r,t) 2 q q 5.4(r.t) F 4 t q r

A parallel plate capacitor of plate area A and plate separation d is charged to potential difference of V.If now disconnected from source and then its plate separation is increased to 3d. The work required to increase the distance is 380 AV d EAV 2d AV 3d AV d

In a singleslit diffraction, the secondorder bright fringe is at a distance 1.40 mm from the centre of the central maximum. The screen is 80.0 cm from a slit of width 0.800 mm. Assuming that the incident light is monochromatic, the approximate wavelength of the incident light is O 5.60107 m 5.60107m O 7.90 x10 m O 7.9010m

Determine the force P needed to pull the 50kg roller over the smooth step. Take 9 45.Find the magnitude of the angle for inimum force P needed to pull the 50 ller over the smooth step. 50 mm B

The Lagrangian of a system is given by Lm1 0 sin0mgl cose, where m,l and g are constant. Which of the following is conserved A. osin0 B. sino C. D. sino sin

Explain the Bipolar Junction Transistor Construction.

Calculate the uncertainty in the position of a baseball of mass 100 grams traveling at 90 mph if the velocity is known to 0.1 mph.

Assume that an electron is confined inside a onedimensional box of width 1 . Estimate the uncertainty in position of the electron from the probability distribution for an electron in its ground state. Next, determine the energy of the electron in its ground state and calculate the magnitude of the electron p momentum using the relation E (this is

Assume that an electron is confined inside a onedimensional box of width 1 . Estimate the uncertainty in position of the electron from the probability distribution for an electron in its ground state. Next, determine the energy of the electron in its ground state and calculate the magnitude of the electron p momentum using the relation E 2m (this

The system of differential equations for the charge on the capacitor q (t) and the current 13(t) in the electrical network shown below is R E R RqRl3 E(t) 196 Ri3q0 dt Find the charge on the capacitor q (t) using Laplace transform when L 1H, R 10, R (0, 0

if a secondary coil has 40 turns, and a primary coil with 20 turns is charged with 50 v of potential difference, then the potential difference in the secondary coil would be A. 50 v in secondary coil B. 25 v in secondary coil C. 60 v in secondary coil D. 100 v in secondary coil

does blood pressure affect the heart rate

Many places in the world are exposed to temperature changes of 50C from winter to summer. If a copper rod is 84 inches during the winter, how long will it be during the summer, approximately

For the set of resistors shown below, calculate the equivalent resistance. 3.0 5.0 1.0 4.0 2.0

What is the total power delivered to the resistors when the switch is open and closed Calculate the power dissipated by each resistor when the switch is closed. 9.00 V Switch R 65.0 2 R 96.00

An AC circuit is shown in the diagram below. The source of emf has a peak voltage of 9.00 V and a frequency of 60.0 Hz. Assume the wires contribute a negligible amount to the resistance and the AC source has negligible internal resistance. Find the equivalent resistance of the circuit. Redraw the circuit showing an equivalent resistor.,315 wwww

Two charges, q 1.75 mC and q2 1.46 mC are placed 4.71 m apart from one another (mC stand for milliCoulomb). What is the magnitude of the electric force that q experiences due to the presence of q F12 91 92 F21

Find the equivalent resistance of the following group of resistors. 3 www 4 www (a) 13.0 (b) 8.4 (c) 4.2 (d) 23 5 www ww 4 ww 6

If Vo 12 V and all the resistors have the same value R 3.0 2, find the current coming from the battery. R (a) 1.3 A (b) 3.3 A (c) 6.3 A (d) 9.3 A

For the RC circuit shown below, find the charge on the capacitor at t 0.2 s after the switch is closed. R 500 24 V (a) 5.3 mC (b) 3.3 mC (c) 1.3 MC (d) 6.3 mC 300 F C

A 3.00 kg particle starts from the origin at time zero. Its velocity as a function of time is given by in meters per second and t is in seconds. Find its acceleration as a function of time. 8t 1tj. where v is

A 3.00 kg particle starts from the origin at time zero. Its velocity as a function of time is given by 7 8t2 1tj. where vis in meters per second and t is in seconds. Find the net force exerted on the particle as a function of time.

If the fundamental frequency of a tube is 671 Hz, and the speed of sound is 343 ms, determine the length of the tube (in m) for each of the following cases. (a) The tube is closed at one end. (b) The tube is open at both ends.

The nonreflective coating on a camera lens with an index of refraction of 1.23 is designed to minimize the reflection of 638nm light. If the lens glass has an index of refraction of 1.56, what is the minimum thickness of the coating that will accomplish this task

What is the wavelength (in m) of an earthquake that shakes you with a frequency of 14.0 Hz and gets to another city 87.0 km away in 12.0 s

A projectile is thrown from the point (0, 0) with an initial speed o at an angle 8 21. At time t, the projectile reaches the point A with coordinates (d, h), where d 33.9 m and h 8.8 m. Given (0, d, h, g), find vo. (Take g 9.8 ms and express your answer using two decimal places.)

A comet moves in an elliptical orbit around a star. When it is closest to the star at a distance of 8.75 x 100 m, the comets speed is 73.0 kms. How far is it from the star when its speed is 58.5 kms Take the mass of the star to be 1.99 x 1030 kg, the same as that of our Sun.