Physics Questions and Answers November 05, 2022

The wave function of a certain particle is y A sinx for x (a) Find the value of A. (b) Find the probability that the particle will be found between x 0 and x

Two long straight wires P and Q carrying cqual current 10A cach were kept parallel to each other at 5 cm distance. Magnitude of magnetic force experienced by 10 cm length of wire P is F. If distance between wires is halved and currents on them are doubled, force F on 10 cm length of wire P will be (1) 8 F (3) F8 (2) 10 F (4) F,10

From the photoelectric effect experiment, following observations are made. Identify which of these are correct A. The stopping potential depends only on the work function of the metal. B. The saturation current increases as the intensity of incident light increases. C. The maximum kinetic energy of a photo electron depends on the intensity of the

A block weighing 200 N is pushed along a surface. If it takes 80 N to get the block moving and 40 N to keep the block moving at a constant velocity, what are the coefficients of friction s and k ?

A Boeing 747 has a wingspan of 68.5 meters and is flying at an altitude of 10,000 meters at a speed of 950 kmh. If the air density is 0.4 kgm3, what is the lift force on each wing according to Bernoullis principle

A water turbine has a diameter of 2 meters and is placed in a river with a flow rate of 10 cubic meters per second. The water level upstream of the turbine is 10 meters higher than downstream, and the turbine is generating 500 kW of power. What is the efficiency of the turbine according to Bernoullis principle

An airplane is flying at an altitude of 10,000 feet, with a speed of 500 mph, and a wing span of 100 feet. If the density of air is 0.002378 kgm3, what is the lift force generated by the wings using Bernoullis principle

A water tank with a diameter of 10 feet is being filled with water at a rate of 10 gallons per minute. The tank is open at the top and the water is 5 feet deep. What is the pressure at the bottom of the tank according to Bernoullis principle, assuming atmospheric pressure is 14.7 psi

Consider a current uniformly distributed over a circular wire with radius a. Determine the total current I if the current density in the wire as a function of the distance from the axis is given by J r. Here, is constant. Answer Choices a. I 2 b. I 3 c. 1 4 d. I 131

An object is 21.0 cm from a converging lens, and the image falls on a screen. When the object is moved 4.80 cm closer to the lens, the screen must be moved 3.00 cm farther away from the lens to register a sharp image. Determine the focal length of the lens.

Look at the drawing given in the figure which has been drawn with ink of uniform linethickness. The mass of ink used to draw each of the two inner circles, and each of the two line segments is m. The mass of the ink used to draw the outer circle is 6m. The coordinates of the centres of the different parts are outer circle (0, 0) left inner circle

The figure shows certain wire segments joined together to form a coplanar loop. The loop is placed in a perpendicular magnetic field in the direction going into the plane of the figure. The X X magnitude of the field increases with time. I, and I are the currents in the segments ab and cd. Then, X X (A) I I X X (B) I

Two small particles of equal masses start moving in opposite directions from a point A in a horizontal circular orbit. Their tangential velocities are v and 2v respectively, as shown in the figure. Between collisions, the particles move with constant speeds. After making how many elastic collisions, other than that at A, these two particles will

A disk of radius a4 having a uniformly distributed charge 6C is placed in the xy plane with its centre at (a2, 0, 0). A rod of length a carrying a uniformly distributed charge 8C is placed on the xaxis from x a4 to x 5a4. Two point charges 7C and 3C are placed at (a4, a4, 0) and (3a4, 3a4, 0), respectively. Consider a cubical surface formed by

Three concentric metallic spherical shells of radii R, 2R, 3R, are given charges Q, Q2, Q3, respectively. It is found that the surface charge densities on the outer surfaces of the shells are equal. Then, the ratio of the charges given to the shells, Q Q2 Q3, is (A) 123 (C) 149 (B) 135 (D) 1818

A ball is dropped from a height of 20 m above the surface of water in a lake. The refractive index of water is 43. A fish inside the lake, in the line of fall of the ball, is looking at the ball. At an instant, when the ball is 12.8 m above the water surface, the fish sees the speed of ball as (A) 9 ms (C) 16 ms (B) 12 ms (D) 21.33 ms

A block of base 10 cm x 10 cm and height 15 cm is kept on an inclined plane. The coefficient of friction between them is 3. The inclination of this inclined plane from the horizontal plane is gradually increased from 0. Then (A) at 0 30, the block will start sliding down the plane (B) the block will remain at rest on the plane up to certain 0 and

CNY Furniture manufactures two kind of coffee tables. The first one is a larger table, called Adirondack. Each Adirondack has six table legs and a table top of 18 square feet. The second one is a smaller table, called Bismarck. Each Bismarck has four table legs and a table top of 16 square feet. In order to plan for its monthly production, the

A particle has wavefunction (x, y, z) Nzea(xyaz), where N is a normalization constant and er is a positive constant. In this state, which one of the following options represents the eigenvalues of L2 and L respectively Some values of Y are Yo . Y O and O h and h 2 and 0 h and h cos 0, Y F sin 0 etto

A spin is denoted as spin up state along the direction 2, which lies in the xyplane and makes an angle with respect to the positive xaxis, if such a measurement is made 1 cos cos particle is in a spin up state along the xaxis (with unit vector 2) and What is the probability of finding the particle to be in a DIN

If I is the angular momentum operator in quantum mechanics, the value of L x will be (A) 0 (B) AL (C) (D) AL

A particle with energy is in a bound state of the onedimensional Hamiltonian H V(r). The expectation value of the momentum ( (A) is always zero. (B) depends on the degeneracy of the eigenstate. (C) is zero if and only if the potential is symmetric V(x) V(r). (D) depends on the energy E of the eigenstate.

A quantum particle is moving in one dimension between rigid walls at z L and x L, under the influence of a potential (see figure). The potential has the uniform value Vo between a

A onedimensional box contains three identical particles in the ground state of the system. Find the ratio of total energies of these particles if they were spin12 fermions, to that if they were bosons. (A) 1 (B) 143 (C) 2 (D) 13

A particle is in the nth energy eigenstate of an infinite onedimensional potential well between I 0 and I L. Let P be the probability of finding the particle between r 0 and x 13. In the limit n o, the value of P is (A) 19 (B) 23 (C) 13 (D) 13

The six faces of a cube are painted violet, blue, red, green, yellow, and orange. If the cube is rolled 4 times, what is the probability that the green face appears exactly 3 times (A) 324 (B) 5124 (C) 5324 (D) 15222

A child pulls a 5 kg wooden sled on dry snow at a constant velocity forward. Determine the frictional force if a) The child pulls the rope at angle 35 above the horizontal. b) The child pulls the rope at angle 35 below the horizontal.

A 60Co nucleus emits a Bparticle and is converted to Ni with JP 4. which in turn decays to the Ni ground state with JP 0 by emitting two photons in succession, as shown in the figure. Which one of the following statements is CORRECT 60 CO GONI GONI GONI Y Y 42 is an electric octupole transition 42 is a magnetic quadrupole transition 20 is an

An aparticle is emitted from the decay of Americium (Am) at rest, i.e... 241Am 232Ua. The rest masses of 241Am, 232U and at are 224.544 GeV, 220.811 GeVe and 3.728 GeV respectively. What is the kinetic energy (in MeVc, rounded off to two decimal places) of the atparticle 94 92 92

A horizontal force of 10 N is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and the wall is 0.2. The weight of the block.

Write a program to find out the given two numbers are coprime or not

EVALUATION State Standards Waves carry energy from one place to another Identify transverse and longitudinal waves in mechanical media such as spring, ropes, and the earth (seismic waves) Solve problems involving wavelength, frequency, speed.

A tripleeffect evaporator using forward feed is to be used to concentrate 14,500 kgh of an 8wt KCl solution entering at 25C to 40 wt. Saturated steam enters the first evaporator at 169.1 kPa absolute. The absolute pressure in the vapor space of the third effect is 19.9 kPa. The heat transfer coefficients in each effect are U 6432 W(m.K), U 4310

What is the first law of thermodynamics, and how does it relate to energy conservation? What is entropy, and how does it relate to the second law of thermodynamics? What is the difference between heat and temperature? How do you calculate the work done by a gas during a thermodynamic process? What is an ideal gas, and what are the assumptions that

The linear magnification produced by a spherical mirror is +3. Analyse this value and state the (i) type of mirror and (ii) position of the object with respect to the pole of the mirror. Draw a ray diagram to show the formation of image in this case.

Draw a ray diagram to show the path of the reflected ray corresponding to an incident ray which is directed towards the principal focus of a convex mirror. Mark on it the angle of incidence and the angle of reflection.

AB and CD, two spherical mirrors, from parts of a hollow spherical ball with its centre at O as shown in the diagram. If arc AB = 1/2 arc CD, what is the ratio of their focal lengths? State which of the two mirrors will always form virtual image of an object placed in front of it and why?

A B 0 D

If the image formed by a spherical mirror for all positions of the object placed in front of it is always erect and diminished , what type of mirror is it? Draw a labelled ray diagram to support your answer.

A viscous liquid is to be pumped between two buildings at a chemical plant in an aboveground pipe that has an OD of 22 cm and is 110 m long. To facilitate pumping, the liquid will be heated to 40 C in order to reduce its viscosity. The liquid flow rate will be 20 kgs and the specific heat of the liquid is 1300 1kg K. Determine the temperature drop

An op-amp has CMRR = 100 dB, differential gain A D = 10 and common mode voltage applied to it is 2mV. Then find the value of common mode output voltage.

Helmholtz free energy is given by the formula ______ (A). F = U + TS (B). F = U * TS (C). F = U/TS (D). F = U TS Q.2. Entropy is defined in which law of thermodynamics? A. Zeroth B. First C. Second D. Third Q.3. The entropy of a system approaches a constant value as the temperature ______ A. Increases B. Decreases C. Approaches absolute zero D.

Find the angle between the surface of x+y+z= 1 and z = x+y-1 at the point of (1 , +1,-1 ) ?

A particle of mass m is moving in a circular path of constant radius r such that its centripetal acceleration ac is varying with time t as ac = k 2 rt 2 where k is a constant. The power delivered to the particle by the force acting on it is

Newtons rings were observed when plano-convex lens is placed with the convex side down on a glass plate; the system is illuminated with monochromatic light. Explain how they are formed. (10 mks)

The image of a candle flame placed at a distance of 30 cm from a mirror is formed on a screen placed in front of the mirror at a distance of 60 cm from its pole. What is the nature of the mirror? Find its focal length. If the height of the flame is 2.4 cm, find the height of its image. State whether the image formed is erect or inverted.

A concave mirror is used for image formation for different positions of an object. What inferences can be drawn about the following when an object is placed at a distance of 10 cm from the pole of a concave mirror of focal length 15 cm? (a) Position of the image (b) Size of the image (c) Nature of the image Draw a labelled ray diagram to justify

Draw ray diagrams for the following cases when a ray of light: (i) passing through centre of curvature of a concave mirror is incident on it. (ii) parallel to principal axis is incident on convex mirror. (iii) is passing through focus of a concave mirror incident on it.

The image formed by a concave mirror is observed to be virtual, erect and larger than the object. Where should the position of the object be relative to the mirror? Draw ray diagram to justify your answer.

A student wants to project the image of a candle flame on a screen 48 cm in front of a mirror by keeping the flame at a distance of 12 cm from its pole. (a) Suggest the type of mirror he should use. (b) Find the linear magnification of the image produced. (c) How far is the image from its object? (d) Draw ray diagram to show the image formation in

With the help of a ray diagram explain why a convex mirror is preferred for rear view mirrors in the motor cars.

An object is placed between infinity and the pole of a convex mirror. Draw a ray diagram and also state the position, the relative size and the nature of the image formed.

A concave mirror of focal length 10 cm can produce a magnified real as well as virtual image of an object placed in front of it. Draw ray diagrams to justify this statement, (b) An object is placed perpendicular to the principal axis of a convex mirror of focal length 10 cm. The distance of the object from the pole of the mirror is 10 cm. Find the

To construct ray diagram we use two light rays which are so chosen that it is easy to know their directions after reflection from the mirror. List these two rays and state the path of these rays after reflection. Use these rays to locate the image of an object placed between centre of curvature and focus of a concave mirror.

A student wants to obtain an erect image of an object using a concave mirror of 12 cm focal length. What should be the range of distance of the candle flame from the mirror? State the nature and size of the image he is likely to observe. Draw a ray diagram to show the image formation in this case.

An object 4.0 cm in size, is placed 25.0 cm in front of a concave mirror of focal length 15.0 cm. (i) At what distance from the mirror should a screen be placed in order to obtain a sharp image? (ii) Find the size of the image. (iii) Draw a ray diagram to show the formation of image in this case.

The image formed by a spherical mirror is real, inverted and its magnification is -2. If the image is at a distance of 30 cm from the mirror, where is the object placed? Find the focal length of the mirror. List two characteristics of the image formed if the object is moved 10 cm towards the mirror.

What is the current state of research on the intersection of quantum mechanics and general relativity, and what are the challenges facing the development of a theory of quantum gravity?

Go to the Solid, Liquid, Gas tab. You can then select one of four substances. Now, use the stove to increase or decrease the temperature of the container at 1 atm and then find the state in which the substance exists at the given conditions. You can also refer to the standard states as given in the righthand side by clicking on the buttons named

An irrigation pump lifts 50 Ls of water from a reservoir and discharges it into a farmers irrigation channel. The pump supplies a total head of 10 m. How much mechanical energy is lost in term of h pump The total pipe length is 50 m and is 20 cm in diameter. The pipe length to the is 12 m. What is the pressure in the pipe at the outlet You may

If g - cm 2 - sec -1 = x Js, then the number x is equal to a. 1*10 -7 b. 1*10 7 c. 1*10 -5 d. 1*10 5

Consider the vectors V0 X 2 and a general vector x Y 4 0 V2 2 4 a. Write an equation in terms of x, y, and z that describes all the vectors x orthogonal to v. b. Write a linear system that describes all the vectors x orthogonal to both v and v2. c. Write the solution set to this linear system in parametric form. What type of geometric object

If the radius of curvature of a spherical mirror is 20 cm, then its focal length is.......?

Define the Principle Of Focus of a Concave mirror. Draw it?

a) Determine whether the velocity field 3ti azj tyK is incomprissible, and irrotational or notational b) Calculate the trajectory for the unsteady, two dimensional flow field given by Ux 1t v y 126 Where the flow passes through point (xo, yo) at t 0 a (C) Water at 36 m above sea levd has d. velocity of 18 ms and pressure of 350 kPa.

K 16 The electric charges on the sphere of radius r3r, r5r, r3 7r are q7q, q217q and q33q respectively. The spheres are on the same line and at a distance I (small L) from each other. In the shown case, the magnitude of the force acting on the left most sphere is 910 N. 93 FOL 2 r3 Now the first and the first two spheres are brought into contact

A car is moving with a velocity of 20 m/s. If the driver applies the brakes and brings the car to a halt in 4 seconds, what is the average acceleration of the car? A ball is thrown vertically upwards from the ground with an initial velocity of 30 m/s. How high will the ball go before coming back to the ground? (Neglect air resistance and take g =

Why is Tyndall effect shown by colloidal particles? State four instance of observing the Tyndall effect.

Draw a labelled diagram to show (i) reddish appearance of the sun at the sunrise or the sunset and (ii) white appearance of the sun at noon when it is overhead.

A star appears slightly higher (above) than its actual position in the sky. Illustrate it with the help of a labelled diagram.

Explain in brief the reason for each of the following: (a) Advanced sun-rise (b) Delayed sun-set.

A narrow PQ of white light is passing through a glass prism ABC as shown in the diagram. Trace it on your answer sheet and show the path of the emergent beam as observed on the screen DE. (i) Write the name and cause of the phenomenon observed.(ii) Where else in nature is this phenomenon observed?(iii) Based on this observation, state the

P B A D E

What is dispersion of white light? State its cause. Draw a ray diagram to show the dispersion of white light by a glass prism.

Differentiate between a glass slab and a glass prism. What happens when a narrow beam of (i) a monochromatic light and (ii) white light passes through (a) glass slab and (b) glass prism?

How will you use two identical glass prisms so that a narrow beam of white light incident on one prism emerges out of the second prism as white light? Draw and label the ray diagram.

Draw a labelled diagram to explain the formation of a rainbow in the sky.

Draw a ray diagram to show the refraction of light through a glass prism. Mark on it (a) the incident ray, (b) the emergent ray and (c) the angle of deviation.

Do you know that the corneal-impairment can be cured by replacing the defective cornea with the cornea of the donated eye? How and why should we organise groups to motivate the community members to donate their eyes after death?

What eye defect is myopia? Describe with a neat diagram how this defect of vision can be corrected by using a suitable lens.

Millions of people of the developing countries of world are suffering from corneal blindness. These persons can be cured by replacing the defective cornea with the cornea of a donated eye. A charitable society of your city has organised a campaign in your neighbourhood in order to create awareness about this fact. If you are asked to participate

A person may suffer from both myopia and hypermetropia defects. (a) What is this condition called? (b) When does it happen? (c) Name the type of lens often required by the persons suffering from this defect. Draw labelled diagram of such lenses.

A person is suffering from both myopia and hypermetropia. (i) What kind of lenses can correct this defect? (ii) How are these lenses prepared? (b) A person needs a lens of power +3 D for correcting his near vision and -3 D for correcting his distant vision. Calculate the focal lengths of the lenses required to correct these defects.

List two causes of hypermetropia. (b) Draw ray diagrams showing (i) a hypermetropic eye and (ii) its correction using suitable optical device.

Write about power of accommodation of human eye. Explain why the image distance in the eye does not change when we change the distance of an object from the eye?

Consider the untransformed BlackScholes equation (except that the time is reversed by setting T Tt). Use a mesh of equal 5stepsize as and equal timesteps of size at so that V. approximates V(jas, not). Write down the system of equations resulting from the direct application of the Crank Nicolson scheme and a projected iterative method an American

If Johnny were to achieve an average power of 1,395 W, what would be his percentile rank If he weighed 80 kg (176.4 lb), how would this affect his percentile rank When watching Johnny perform the test, you notice that he bends his legs while he is in the air. Could this action affect the results obtained with the switch mat or force plate If yes,

Sanjay is a 19yearold who weighs 68 kg (149.9 lb). He performs a battery of jump tests that determine his static vertical jump to be 35 cm (13.8 in.) and his countermovement vertical jump to be 43 cm (16.9 in.). Based on these data, what is his eccentric utilization ratio (EUR) for both power output and vertical displacement Pick one of the power

The electric power in watts(W) produced by a source is given by p=3r- r 3 Where r is the resistance in ohms ( ) in the circuit. Find the value of r that provides the maximum power.

For following circuits, the determine the equivalent impedance if frequency is (i) same frequency (b) double (iii) reduced to half. j4 bo 2 ww j6 6 j8 Figure 1 4 j8 j12

What is the role of finite element analysis (FEA) in advanced engineering? How do advanced materials such as carbon fiber reinforced polymers (CFRPs) contribute to the development of new technologies? What are some of the challenges faced in the development of renewable energy technologies?

What are the properties of Laplace Transform and Theorem of Laplace Transform and S - shifting The first shift Theorem in Mathematical Physics.

A multifluid manometer is used to measure the air pressure in a pipe. Considering the air pressure is measured to be 76 kPa, what is the specific gravity of the second fluid The specific gravity of the first fluid is 13.55. Take the atmospheric pressure to be 100 kPa and the density of water to be 1000 kgm3. H 22 cm Air (P76 PM

The voltage (RMS) across the 300- antenna input terminals of an FM receiver is 3.5 V. (a) Find the input power (watts). (b) Evaluate the input power as measured in decibels below 1 mW (dBm). (c) What would be the input voltage (in microvolts) for the same input power if the input resistance were 75 instead of 300 ?

The weight of a 100-kg mass body at a given elevation is 0.9804 kN. If the variation from the standard gravitational acceleration is -0.004 m/s2 per 1000 m, Determine the elevation at this point in m.

Two cars, Car A and Car B, are initially at rest. Car A starts accelerating at a constant rate of 2 m/s^2, while Car B accelerates at a constant rate of 3 m/s^2. After 5 seconds, which car will have traveled a greater distance?

A 12kg box starts at rest and reaches a velocity of 3.45ms after traveling a distance of 12m. What was the force on the box?

Franklin lifts a 2kg weight vertically. If he lifts it so that way the velocity of the weight is constant, how much force is he using?

m 9 9.8. 82

Derek pushes a 10kg crate along a rough surface with 35N of force. He observes that m it is only accelerating at a rate of 2 What s must the value of the force of friction be (Assume the only two forces acting on the object are friction and Derek).

An object is thrown straight upward with a velocity of 20 m/s. Neglecting air resistance, what is the maximum height the object will reach? How long will it take the object to reach its maximum height?

A car is traveling along a straight road with a constant speed of 20 m/s. The driver sees an obstacle in the road and applies the brakes, causing the car to decelerate at a rate of 5 m/s^2. How long does it take the car to come to a stop?

Which of the following is true for preganglionic neurons? a. They terminate in the spinal cord b. They are unmyelinated axons c. They merge with the anterior root of a spinal nerve to form short segments known as white rami communicantes d. Axons are myelinated in both divisions of the ANS