S
  1. study help
  2. subject categories
  3. sciences
  4. physics
  5. october 2022
  6. 06

Physics Questions and Answers October 06, 2022

Expert-verified solutions to help you succeed

In an ammeter 0.2 of main current passes through the galvanometer. If resistance of galvanometer is G, the resistance of ammeter will be 1 (a) G 499 499 (b) G 500 (c) G 500 500 (d) G 499

A body of mass m is taken from the earths surrace to the height equal to twice the radius (R) of the earth. The change in potential energy of body will be (a) mgR (b) 3 mgR (c) mgR (d) mg2R

Two vibrating tuning forks produce progressive waves given by y 4 sin 500 t and y 2 sin 506 t. Number of beats produced per minute is (a) 360 (c) 60 (b) 180 (d) 3

Given the value of Rydberg constant is 10m, the wave number of the last line of the Balmer series in hydrogen spectrum will be (a) 0.025 x 10 m (c) 0.25 x 10 m (b) 0.5 x 10 m (d) 2.5 x 10 m 1

If a unit vector is represented by 0.5 0.8 ck, the value of c is (a) 1 (c) 0.01 (b) 0.11 (d) 0.39

Two metallic spheres of radii 1 cm and 3 cm are given charges of 110 C and 510 C, respectively. If,these are connected by a conducting wire, the final charge on the bigger sphere is (a) 2 10 C (c) 4 10 C (b) 3 10 C (d) 1 x 10 C

In the Bohr model of a hydrogen atom, the centripetal force is furnished by the coulomb attraction between the proton and the electron. If a, is the radius of the ground state orbit, m is the mass, e is the charge on the electron and , is the vacuum permittivity, the speed of the electron is (a) 0 (c) e 4am (b) (d) e Eoaom 4om

The mass of proton is 1.0073 u and that of neutron is 1.0087 u (u atomic mass unit). The binding energy of He is (a) 0.061 u (c) 0.0305 erg (b) 0.0305 j (d) 28.4 MeV

A system is taken from state a to state c by two paths adc and abc as shown in the figure. The internal energy at a is U 10 J. Along the path adc the amount of heat absorbed 8Q, 50 J and the work done 8W, 20 J,whereas along the path abc the heat absorbed 8Q 36 J. The amount of work done along the path abc is NEET Kar. 2013 (a) 6 J (c) 12 J b

Two radioactive nuclei P and Q, in a given sample decay into a stable nucleolus R. At time t 0, number of P species are 4 N and that of Q are No. Halflife of P (for conversion to R) is 1 minute where as that of Q is 2 minutes. Initially there are no nuclei of R present in the sample. When number of nuclei of P and Q are equal, the number of

The current (I) in the given circuit is (a) 1.6 A (c) 0.32 A 4.8 VZ R302 R8602 Imm Rc60 C (b) 2.0 A (d) 3.2 A

In Youngs experiment, two coherent sources are placed 0.90 mm apart and fringe are observed one metre away. If it produces second dark fringe at a distance of 1 mm from central fringe, the wavelength of monochromatic light used would be (a) 60 x 10 cm (c) 10 x 10 cm (b) 10 x 10 cm (d) 6 x 10 cm

A 10 eV electron is circulating in a plane at right angles to a uniform field at magnetic induction 10 Wbm ( 1.0 gauss). The orbital radius of the electron is (a) 12 cm (b) 16 cm (d) 18 cm (c) 11 cm

Four identical thin rods each of mass M and length 1, form a square frame. Moment of inertia of this frame about an axis through the centre of the square and perpendicular to its plane is (a) M1 (b) M1 3 (c) M1 (d) M1

The time of reverberation of a room A is one second. What will be the time (in seconds) of reverberation of a room, having all the dimensions double of those of room A (a) 4 (c) 1 HINN (b) (d) 2

The potential difference that must be applied to stop the fastest photoelectrons emitted by a nickel surface, having work function 5.01 eV, when ultraviolet light of 200 nm falls on it, must be (a) 2.4 V (c) 2.4 V (b)1.2 V (d) 1.2 V

A particle starts its motion from rest under the action of a constant force. If the distance covered in first 10 seconds is S, and that covered in the first 20 seconds is S, then 2009 (a) S 3S, (c) S S, (b) S, 4S, (d) S, 2S, 1

If a sphere is rolling, the ratio of the translational energy to total kinetic energy is given by (a) 7 10 (c) 107 (b) 25 (d) 57

A milli voltmeter of 25 milli volt range is to be converted into an ammeter of 25 ampere range. The value (in ohm) of necessary shunt will be 2012 (a) 0.001 (c) 1 (b) 0.01 (d) 0.05

A camera with a 83.9mm focal length lens is being used to photograph the Sun. What is the image height of the Sun on the film, in millimeters, given the sun is 1.40 10 km in diameter and is 1.50 10 km away hi 7.83 1071 select part Grade Summary Deductions Potential cos() sin() cotan() asin() atan() acotan() cosh() tanh() tan() acos() sinh()

If the threshold wavelength for a certain metal is 2000 , then the workfunction of the metal is,(a) 6.2 J (c) 6.2 MeV (b) 6.2 eV (d) 6.2 keV

If a ball is thrown vertically upwards with speed u, the distance covered during the last t seconds of its ascent is (a) (u gt) t (b) ut (c) gt (d) ut gt

Infinite number of bodies, each of mass 2 kg are situated on xaxis at distances lm, 2m, 4m, 8m, respectively, from the origin. The resulting gravitational potential due to this system at the origin will be 8 (a) G (b) G (c)4 G (d) G .....

Two sound sources emitting sound each of wavelength are fixed at a given distance apart. A listener moves with a velocity u along the line joining the two sources. The number of beats heard by him per second is (a)

A hollow cylinder has a charge q coulomb within it If is the electric flux in units of voltmeter associated with the curved surface B, the flux linked with the plane surface A in units of voltmeter will be B (a) (b) (c) q 2013012 p q () (210 ) Eo A

Each corner of a cube of side has a negative charge, q. The electrostatic potential energy of a charge q at the centre of the cube is (a) 4q 21 3q (b) 4 4q (C) (d) 4q V3

A transformer having efficiency of 90 is working on 200V and 3kW power supply. If the current in the secondary coil is 6A, the voltage across the secondary coil and the current in the primary coil respectively are (a) 300 V, 15A (c) 450V, 13.5A (b) 450 V, 15A (d) 600V, 15A

An ideal gas goes from state A to state B via three different processes as indicated in the PV diagram B If Q, Q, Q, indicate the heat a absorbed by the gas along the three processes and AU,, AU,, AU, indicate the change in internal energy along the three processes respectively, then (a) QQQ, and AUAU, AU (b) Q, Q Q, and AU, AU, AU, (c) Q Q Q,

The resistance of a wire is R ohm. If it is melted and stretched to n times its original length, its new resistance will be (b) nR n (d) nR

The activity of a radioactive sample is measured as N counts per minute at t 0 and Ne counts per minute at t 5 minutes. The time (in minutes) at which the activity reduces to half its value is (a) loge 2 (c) 5 log2 10 5 (b) loge 2 (d) 5 log 2

An ideal gas undergoing adiabatic change has the following pressuretemperature relationship (a) PYTYconstant 1996 (b) PYTY1 constant (c) PYTY constant (d) PYTY constant

The frequency of a light wave in a material is 2 10 Hz and wavelength is 5000 . The refractive index of material will be (a) 1.50 (c) 1.33 (b) 3.00 (d) 1.40

Two cells, having the same e.m.f., are connected in series through an external resistance R. Cells have internal resistances r, and r, (r,r,) respectively. When the circuit is closed, the potential difference across the first cell is zero. The value of R is (a) 2 112 2 (c) r r (d) r r (b)

A solid cylinder of mass 3 kg is rolling on a horizontal surface with velocity 4 ms. It collides with a horizontal spring of force constant 200 Nm. The maximum compression produced in the spring will be (a) 0.5 m (c) 0.7 m (b) 0.6 m (d) 0.2 m

A step-down transformer has 50 turns on secondary and 1000 turns on the primary winding. If a transformer is connected to 220 V and 1 A AC source, what is the output current of the transformer (a) 1/20 A (b) 20 A (c) 100 A (d) 2 A

Atmospheric pressure atop Mt. Everest is 3.30x10 Nm. (a) What is the partial pressure of oxygen there if it is 20.9 of the air (b) What percent oxygen should a mountain climber breathe so that its partial pressure is the same as at sea level, where atmospheric pressure is 1.01x105 Nm (c) One of the most severe problems for those climbing very high

If 25W, 220 V and 100 W, 220 V bulbs are connected in series across a 440 V line, then 2001 (a) only 25W bulb will fuse (b) only 100W bulb will fuse (c) both bulbs will fuse (d) none of these

(a) in the deep space between galaxies, the density of atoms is as low as 10 atomsm, and the temperature is a frigid 2.7 K. What is the pressure (b) What volume (in m) is occupied by 1 mol of gas (c) If this volume is a cube, what is the length of its sides in kilometers

A uniform rod AB of length 1, and mass m is free to rotate about point A. The rod is released from rest in the horizontal position. Given that the moment of inertia of the rod about A is the initial angular acceleration of the rod will be ml 3,B A 60 IN W 8 RadHE 7

A particle of mass 1 mg has the same wavelength as an electron moving with a velocity of 310 ms. The velocity of the particle is (a) 2.7x 10 ms (c) 3 x 10 ms (mass of electron 9.110 kg) (b) 9 10 ms (d) 2.710 ms

A thin rod of length L and mass M is bent at its midpoint into two halves so that the angle between them is 90. The moment of inertia of the bent rod about an axis passing through the bending point and perpendicular to the plane defined by the two halves of the rod is ML (a) 24 ML (b) 12 ML (c) 6 (d) 2ML 24

When current in a coil changes from 5 A to 2 A in 0.1 s, an average voltage of 50 V is produced. The self-inductance of the coil is (a) 0.67 H (b) 1.67 H (c) 3 H (d) 6 H

A solenoid is 1.5 m long, and its inner diameter is 4.0 cm. It has three layers of windings of 1000 turns each and carries a current of 2.0 amperes. The magnetic flux for a cross-section of the solenoid is nearly (a) 2.5 10 7 weber (b) 6.31 10 6 weber (c) 5.2 10 5 weber (d) 4.1 10 5 weber

In a circular coil. when no. of turns is doubled & resistance becomes half of the initial, then inductance becomes (a) 4 times (b) 2 times (c) 8 times (d) No change

The rms value of ac of 50 Hz is 10 amp. The time taken by the alternating current in reaching from zero to maximum value and the peak value of current will be, (a) 2 10 -2 sec and 14.14 amp (b) 1 10 -2 sec and 7.07 amp (c) 5 10 -3 sec and 7.07 amp (d) 5 10 -3 sec and 14.14 amp

Keplers third law states that square of period of revolution (T) of a planet around the sun, is proportional to third power of average distance r between sun and planet i.e. T Kr here K is constant. If the masses of sun and planet are M and m respectively then as per Newtons law of gravitation force of attraction between GMm them is F G here G is

A coil of inductance 300 mH and resistance 2? is connected to a source of voltage 2V. The current reaches half of its steady-state value in (a) 0.15 sec (b) 0.3 sec (c) 0.05 sec (d) 0.1sec

Equation of a progressive wave is given by IT y 4 sin ( 6 Then which of the following is correct (a) v 5 cm (b) 18 cm (c) a 0.04 cm (d) f 50 Hz

A galvanometer of resistance, G is shunted by a resistance S ohm. To keep the main current in the circuit unchanged, the resistance to be put in series with the galvanometer is s (a) (b) (c) (d) (SG) SG (SG) G SG G (SG)

The time constant of an LR circuit is 20 ms. The circuit is connected at t = 0 and the steady-state current is found to be 4A. Find the current at 80 ms. (a) 0.98 A (b) 1 A (c) 0.44 A (d) 0.88 A

Complete this problem on your own paper. Be sure to show your work Upload your work to the dropbox by the due date. You have a box of 12.0 F capacitors and an 18.0 V battery. 1) Draw a circuit showing how you could connect these capacitors to achieve an equivalent capacitance of 28.0 F. (There may be more than one way to do this) 2) You connect

Two waves of lengths 50 cm and 51 cm produce 12 beats per sec. The velocity of sound is (a) 306 ms (c) 340 ms (b) 331 ms (d) 360 ms

An electron is moving round the nucleus of a hydrogen atom in a circular orbit of radius r. The Coulomb force F between the two is (a) KF (b) Kf (c)K f (d) K (where K 41E0

A ship A is moving Westwards with a speed of 10 km h and a ship B 100 km South of A, is moving Northwards with a speed of 10 km h. The time after which the distance between them becomes shortest, is (a) 5 h (c) 102h (b) 52h (d) 0 h

The decay constant of a radio isotope is . If A, and A, are its activities at times t, and t, respectively, the number of nuclei which have decayed during the time (t t) (a) (A A) (b) At At (c) A A2 AA (d)

What will be the equivalent resistance of circuit shown in figure between two points A and D (a) 10 (c) 30 10 www www 10 10 www 10 www 10 wwB 10 (b) 20 (d) 40 AWD 10

A car speedometer has a 4 uncertainty. What is the range of possible speeds when it reads 126 kmh lowest kmh. kmh highest Convert this to miles per hour. mih mih lowest highest

In a simple pendulum of length 1 the bob is pulled aside from its equilibrium position through an angle 0 and then released. The bob passes through the equilibrium position with speed (a) 2gl(1 cose) (b) 2glsin0 (c) 2gl (d) 2gl (1 cose)

A gas at 27C temperature and 30 atmospheric pressure is allowed to expand to the atmospheric pressure. If the volume becomes 10 times its initial volume, then the final temperature becomes (a) 100C (c) 273C (b) 173C (d)173C

Two spheres A and B of masses m, and m respectively collide. A is at rest initially and B is moving with velocity v along xaxis. After collision B has a velocity in a direction perpendicular to the original direction. The mass A moves after collision in the direction. (a) Same as that of B (b) Opposite to that of B (c) 0 tan (12) to the xaxis (d)

In an astronomical telescope in normal adjustment a straight black line of lenght L is drawn on inside part of objective lens. The eyepiece forms a real image of this line. The length of this image is 7. The magnification of the telescope is (a) 1 (c) L1 (b) LI (d) 1

The particle executing simple harmonic motion has a kinetic energy Ko cos wt. The maximum values of the potential energy and the total energy are respectively (a) K2 and K (c) K, and K (b) K, and 2K (d) 0 and 2K.

Masses M and M hanging from the ends of strings of lengths L and L are executing simple harmonic motions. If their frequencies are f 2f, then (a) L 2L and M M2 A (b) L 4L regardless of masses A B (c) L L4 regardless of masses (d) L 2L, and M 2M B B

The figure shows elliptical orbit of a planet m about the sun S. The shaded area SCD is twice the shaded area SAB. If t, is the time for the planet to move from C to D and t, is the time to move from A to B then m (a) t 4t, (c) t t (b) t 2t (d) t, t D

When a hydrogen atom is raised from the ground state to an excited state, (a) P.E decreases and K.E. increases (b) P.E. increases and K.E decreases (c) both K.E. and P.E. decrease (d) absorption spectrum

An electric kettle takes 4A current at 220 V. How much time will it take to boil 1 kg of water from temperature 20 C The temperature of boiling water is 100 C. (a) 6.3 min (c) 12.6 min (b) 8.4 min (d) 4.2 min

A capacitor is charged by a battery. The battery is removed and another identical uncharged capacitor is connected in parallel. The total electrostatic energy of resulting system (a) decreases by a factor of 2 (b) remains the same (c) increases by a factor of 2 (d) increases by a factor of

Two wires of the same metal have same length, but their crosssections are in the ratio 31. They are joined in series. The resistance of thicker wire is 1002. The total resistance of the combination will be (a) 10 (c) 40 (b) 20 (2 (d) 100

Two bodies with kinetic energies in the ratio 41 are moving with equal linear momentum. The ratio of their masses is (a) 12 (c) 41 (b) 11 (d) 14

For a cubic crystal structure which one of the following relations indicating the cell characteristics is correct (a) a b c and a B y 90 (b) a b c and a y 90 (c) a b c and a B y 90 (d) a b c and a and y 90

Given that the ground state energy of Halam the is 136 ev, the ground state energy of Positonium (which is bound state of an election 4 bosibon) is a) 6.8er b) 6.8 ev c)13.6ev d)272ev.

12 A mulon (M) from cosmic rays in trapped by a proton to form a Hlike atom. Given. that a muon is approximately 200 times Reavier than e, the longest wavelength of the spechal line (in the analogue of the lymen series) of such an atom will be Amax 1215A a 5.62 A by 667 A C) 375 A d) 13.3
image

A car whose mass is 1000 kg wants to accelerate from rest to a speed of 60 mph (miles per hour) in 8.0 s. Ignore friction. Convert 60 mph to ms. 1 mile 1609 m, 1 hour 3600 s Keep 2 digits after the decimal point. Unit is ms Case speed 2 Uf VO ms

The electonic energy levels in a Hatom are given by En(136n2) ev. If a selectire excitation to the n100 level is to be made using a laser, the maximum allowed frequency line width of the lases is a) 6.5 MHz b) 6.5 GHz C) 6.5Hz d) 6.5KHz

If the B.Es of the e in the KL shells of silver atom are 25.4 kev 3.34ev. Then the K.E of auger e will be a) 22kev b) 9.3kev c) 10.5kev d) 18.7 kev

find the number of states available for e for n2 in Hatom

How much does the total angular momentum quantum number J changes in the transition as Cr (3d6) atom as it ionizes to cr2t (3d4) a) increases by 2 c) decreases by 4 b) decreases by 2 d) doesnt change.

The LS configurations as of the ground state of 12mg, 12Al,17cl and 18Ar are respectively.

find the ground state spectroscopic terms of Scd1. Also find the degeneracy of sc
image

If the fine structure splitting between the 2P32 and 2 P12 levels in the Rydrogen atom is 0.4 cm1, the corresponding splitting in Li2t will approximately be a) 1.2 cm b) (0.8cm c) 224cm d) 36.8cm.

The separations between the adjacent levels of a normal multiple are found to be 22 cm1. Assume that the multiple is described well by the Ls coupling Scheme of the land Rule, namely E(J)E(J1)AJ, where A is a constent ,4 33 cm. Assume that the multiplet is described well by the LS coupling scheme the Landels Rule, namely E(J)E(31) A3, where A is

A particle of mass m is initially at rest at the origin. It is subjected to a force and starts moving along the x axis. Its kinetic energy K changes with time as dKdt yt, where y is a positive constant of appropriate dimensions. Which of the following statements is (are) true (A) The force applied on the particle is constant (B) The speed of the

Consider a thin square plate floating on a viscous liquid in a large tank. The height h of the liquid in the tank is much less than the width of the tank. The floating plate is pulled horizontally with a constant velocity up. Which of the following statements is (are) true (A) The resistive force of liquid on the plate is inversely proportional to

The spectral line corresponding to an atomic transition from J1 to J0 states splits in a magnetic field of Ik gaurs into three components seperated by 1.6X103 A. If the zero field special. line corresponds Jo 1849 A, what is the 8factor corresponding to an the J1state b) 32 c) 1 d 12 a)

An infinitely long thin nonconducting wire is parallel to the zaxis and carries a uniform line charge density 2. It pierces a thin non conducting spherical shell of radius R in such a way that the arc PQ subtends an angle 120 at the centre O of the spherical shell, as shown in the figure. The permittivity of free space is o. Which of the following

A wire is bent in the shape of a right angled triangle and is placed in front of a concave mirror of focal length f, as shown in the figure. Which of the figures shown in the four options qualitatively represent(s) the shape of the image of the bent wire (These figures are not to scale.) (A) (C) a 8 a 45 0

In a radioactive decay chain, 382 Th nucleus decays to 22 Pb nucleus. Let Na and No be the number of a and 90 82 B particles, respectively, emitted in this decay process. Which of the following statements is (are) true (A) N 5 (C) NB 2 (B) N 6 (D) NB 4

In an experiment to measure the speed of sound by a resonating air column, a tuning fork of frequency 500 Hz is used. The length of the air column is varied by changing the level of water in the resonance tube. Two successive resonances are heard at air columns of length 50.7 cm and 83.9 cm. Which of the following statements is (are) true (A) The

A solid horizontal surface is covered with a thin layer of oil. A rectangular block of mass m 0.4 kg is at rest on this surface. An impulse of 1.0 Ns is applied to the block at time t0 so that it starts moving along the xaxis with a velocity v(t) ve, where vo is a constant and t 4 s. The displacement of the block, in meters, at t t is Take e

A ball is projected from the ground at an angle of 45 with the horizontal surface. It reaches a maximum height of 120 m and returns to the ground. Upon hitting the ground for the first time, it loses half of its kinetic energy. Immediately after the bounce, the velocity of the ball makes an angle of 30 with the horizontal surface. The maximum

A particle, of mass 10 kg and charge 1.0 C, is initially at rest. At time t 0, the particle comes under the influence of an electric field E(t) E, sin oot, where E 1.0 NC and 10 rad s. Consider the effect of only the electrical force on the particle. Then the maximum speed, in m s, attained by the particle at subsequent times is

A moving coil galvanometer has 50 turns and each turn has an area 2 10 m. The magnetic field produced by the magnet inside the galvanometer is 0.02 T. The torsional constant of the suspension wire is 104 N m rad. When a current flows through the galvanometer, a full scale deflection occurs if the coil rotates by 0.2 rad. The resistance of the coil

A steel wire of diameter 0.5 mm and Youngs modulus 2 x 10 Nm carries a load of mass M. The length of the wire with the load is 1.0 m. A vernier scale with 10 divisions is attached to the end of this wire. Next to the steel wire is a reference wire to which a main scale, of least count 1.0 mm, is attached. The 10 divisions of the vernier scale

One mole of a monatomic ideal gas undergoes an adiabatic expansion in which its volume becomes eight times its initial value. If the initial temperature of the gas is 100 K and the universal gas constant R 8.0 J mol K, the decrease in its internal energy, in Joule, is

In a photoelectric experiment a parallel beam of monochromatic light with power of 200 W is incident on a perfectly absorbing cathode of work function 6.25 eV. The frequency of light is just above the threshold frequency so that the photoelectrons are emitted with negligible kinetic energy. Assume that the photoelectron emission efficiency is 100.

The total spin of a Hatom is due to the contribution of spins of the 4 the proton. In the high temperature limit, the ratio g number of atoms in the spinI stale to the number of spin 0 state is a) 2 b) 3 C 12 d 13

Consider a hydrogenlike ionized atom with atomic number Z with a single electron. In the emission spectrum of this atom, the photon emitted in the n 2 to n 1 transition has energy 74.8 eV higher than the photon emitted in the n 3 to n 2 transition. The ionization energy of the hydrogen atom is 13.6 eV. The value of Z is

The electric field E is measured at a point P(0, 0, d) generated due to various charge distributions and the dependence of E on d is found to be different for different charge distributions. ListI contains different relations between E and d. ListII describes different electric charge distributions, along with their locations. Match the functions

A planet of mass M, has two natural satellites with masses m, and m. The radii of their circular orbits are R and R respectively. Ignore the gravitational force between the satellites. Define v, L, K and T to be, respectively, the orbital speed, angular momentum, kinetic energy and time period of revolution of satellite 1 and v, L2, K and T to be

One mole of a monatomic ideal gas undergoes four thermodynamic processes as shown schematically in the PV diagram below. Among these four processes, one is isobaric, one is isochoric, one is isothermal and one is adiabatic. Match the processes mentioned in List1 with the corresponding statements in ListII. LISTI P. In process I Q. In process II R.