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# Physics

## Total charge in coulomb of 75.0 kg of electronsa)-13.1868 × 10–19Cb)-8.242 × 1030Cc)-11.1896 × 1030Cd)-13.1868 × 1012CCorrect answer is option 'D'. Can you explain this answer?

Weight of electron is 9.11Ã—10^(-31)kg.
Let electron number is N in 75kg
then N=75kg/(9.11Ã—10^(-31)kg).
Then charge of 75kg electron is (NÃ—1.6Ã—10^(-19))
Where charge of one electron is 1.6Ã—10^(-19)

Rttt Fgg asked   •  18 minutes ago

## Light refracts when it goes from air to water, this is because which of the following get smaller?a)wavelength, speedb)wavelength, frequency c)speed, frequencyd)all threeCorrect answer is option 'A'. Can you explain this answer?

When light travels from air into water, it slows down, causing it to change direction slightly. This change of direction is called refraction. When light enters a more dense substance (higher refractive index), it 'bends' more towards the normal line.

Bharti Sharma asked   •  2 hours ago

## Consider the funnel formed by revolving the curve y = 1/x about the x- axis, between x = 1 and x = a, where a > 1 If Sa denote the surface area of the funnel then  a)πb)-πc)∞d)-∞Correct answer is option 'C'. Can you explain this answer?

Yikker Yikker asked   •  5 hours ago

## A pendulum is made of a massless string of length L and a small bob of negligible size and mass m. It is released making an angle q0 (<<1 rad) from the vertical. When passing through the vertical, the string slips a bit from the pivot so that its length increases by a small amount d(d << L) in negligible time. If it swings up to angle q1 one the other side before starting to swing back, then to a good approximation which of the following expressions is correct?... more

Deepak Singh asked   •  5 hours ago

## The variation of binding energy per nucleon with respect to the mass number of nuclei is shown in the figure.Consider the following reactions: a)Both (1) and (2) are allowedb)Both (1) and (2) are forbiddenc)(1) is forbidden and (2) is allowedd)(1) is allowed and (2) is forbiddenCorrect answer is option 'C'. Can you explain this answer?

PARUL PATEL asked   •  7 hours ago

## A disk of radius q/4 having a uniformly distributed charge 6C is placed in the x-y plane with its centre at  A rod of length a carrying a uniformly distributed charge 8C is placed on the x-axis from  Two point charges - 7C and 3C are placed at  respectively. Consider a cubical surface formed by six surfaces  The electric flux through this cubical surface isa)-2C/ε0b)2C/ε0c)10C/ε0d)12C/ε0Correct answer is option 'A'. Can you explain this answer?

RAJNEESH SHARMA asked   •  7 hours ago

## An infinitely long hollow cylinder of radius R carrying a surface charge density σ is rotated about its cylindrical axis with a constant angular speed ω. The magnitude of the surface current isa)2σRωb)σR2ωc)2πσRωd)πσRωCorrect answer is option 'B'. Can you explain this answer?

Nihla Ninus asked   •  8 hours ago

## If F=(2x^2-3z) i cap -2xy j cap - 4x k cap then evaluate triple integral of del F where v is bounded by the plane x=0 y=0 z=0 and 2x + 2y+ z= 4 Answer = 8Ã·3 please solve this?

Ankit Gupta asked   •  8 hours ago

## The thermodynamical relation expressing the change at temperature with volume at constant entropy isSelect one:a)b)c)d)Correct answer is option 'C'. Can you explain this answer?

Sumoksha Parhi asked   •  9 hours ago

## A ball impinges directly on a similar ball at rest. The first ball is brought to rest by the impact. If half the kinetic energy is lost by impact. What is the value of the coefficient of restitution?a)1/2√2b)√3/2c)1/√2d)1/√3Correct answer is option 'C'. Can you explain this answer?

Aman Kumar asked   •  9 hours ago

## What is the difference between text charge and source charge?

Monu Singhal asked   •  9 hours ago

## A certain gas obeys the equation of state PV = RT + bP.Calculate ΔU, Q and W, when 1 mole of the gas expands reversibly at 300 K from 0.220 to 20.02 for isothermal case ?Correct answer is 'Â– 11.548'. Can you explain this answer?

Mallicka Kundu asked   •  9 hours ago

## An ideal gas consist of 3d polyatomic gas. Temperature is such that only one vibrational mode is excited. If R denotes the gas constant then Cv of one mole of this gas is?

Vikram Bhatia asked   •  10 hours ago

## Which of the following mapping is not linear ?a)F : R2 → R2 ; F(x, y) = (x + y, x)b)F : R2 → R3 ; F(x, y) = (x + 3, 2y, x + y)c)F : R3→ R3 ; F(x, y, z) = (x + 2y – z, y + z, x + y – 2z)d)F : R2 → R2 ; F(x, y) = (x – y, x – 2y)Correct answer is option 'B'. Can you explain this answer?

Arka Bhattacharjee asked   •  10 hours ago

## Let X be a random variable of continuous type with probability density function f(x). Then, based on single observation X, the most powerful test of size α = 0.1 for testing H0 : f(X) = 2x, 0 < x < 1, against H1 : f(X) = 4x2, 0 < x < 1, has powera)9/10b)1/10c)81/100d)19/100Correct answer is option 'D'. Can you explain this answer?

Chandra Chana asked   •  10 hours ago

## Let the random variable X have moment generation functiona)1/4b)1/2c)1/3d)2/3Correct answer is option 'B'. Can you explain this answer?

Neha Goyal asked   •  10 hours ago

## A mass m, lying on a horizontal, frictionless surface, is connected to one end of a spring. The other end of the spring is connected to a wall, as shown in the figure. At t = 0, the mass is given an impulse.The time dependence of the displacement and the velocity of the mass (in terms of non- zero constants A and B) are given by... more

Anjali Singh asked   •  10 hours ago

## Let an be a sequence such that a1 = a, a2 = b and an = (a + an–1)/2 for n > 2. Calculate the limit?a)bb)(a + b)/2c)ad)a + bCorrect answer is option 'C'. Can you explain this answer?

Pallavi Khotele asked   •  10 hours ago

## A system consists of N number of particles, N » 1. Each particle can have only one of the two energies E1 or E1 + ε (ε > 0). If the system is in equilibrium at a temperature T, the average number of particles with energy E1 isa)b)c)d)Correct answer is option 'C'. Can you explain this answer?

Sudheer Raghuvanshi asked   •  10 hours ago

## How to convert MHz to cm^-1?

Dv 16 asked   •  12 hours ago

## The particle A and B of mass m and one particle C of mass M are kept on the x axis in the order ABC. Particle A is given a velocity vi. Consequently there are two collisions, both of which are completely inelastic. If there's... more

Bibhuti B. Behera asked   •  12 hours ago

## Two particles A and B of mass m and one particle C of mass are kept on the x axis in thr order ABC, Particle A is given a velocity vi . Consequently there are two collisions, both of which are completely inelastic. If the net energy loss because of these collisions is 7/8 of the initial energy,, the value of M is (ignore frictional losses)a)8 mb)6 mc)4 md)2 mCorrect answer is option 'B'. Can you explain this answer?

Narendra Nari asked   •  13 hours ago

## A system consisting of n components functions if, and only if, at least one of n components functions. Suppose that all the n components of the system function independently, each with probability 3/4. If the probability of functioning of the system is 63/64, then the value of n is a) 2 b) 4c) 3d) 5Correct answer is option 'C'. Can you explain this answer?

Suruchi Somwanshi asked   •  14 hours ago

## A die is thrown (n + 2) times. After each throw a ‘+’ is recorded for 4, 5 or 6 and ‘–’ for 1, 2 or 3, the signs forming an ordered sequence each, except the first and the last sign, is attached a characteristic random variable which takes the value 1 if both the neighbouring signs differ from the one between them and 0 otherwise. If X1, X2, ..., Xn are characteristic random variables, find the mean and variance of... more

Dhanusri Potlapalli asked   •  15 hours ago

## V directly propotional to g of x Ã—h of y?

Shivani Sharma asked   •  16 hours ago

## Consider the function f (x, y) = x3 − 3xy2, x,y ∈ ℝ. Which one of the following statements is TRUE?a)f has a local minimum at (0, 0)b)f has a local maximum at (0, 0)c)f has global maximum at (0, 0)d)f has a saddle point at (0, 0)Correct answer is option 'D'. Can you explain this answer?

Srn8 Ksn asked   •  18 hours ago

## Let S be the surface in R3 defined by the parametric equationr = 2 + cos t + cos uθ = t           0 ≤  t ≤ 2πz = sin u     0 ≤ u ≤ 2πthen the using the divergence theorem what is the volume of the region inside S.a)4π2b)-4π2c)4πd)-4πCorrect answer is option 'A'. Can you explain this answer?

Manish Kumar asked   •  19 hours ago

## A sine wave of 5V amplitude is applied at the input of the circuit shown in the figure. which of the following waveforms represents the output most closely?a)b)c)d)Correct answer is option 'D'. Can you explain this answer?

Ankita Rani Dash asked   •  20 hours ago

## electromagnetic inductiin Related: Electromagnetism?

SANJAY MEHTA asked   •  20 hours ago

## For the second box:a)The first excited state is 2 fold degenerateb)The first excited state is 3 fold degeneratec)The first excited state is non degenerate d)None of the aboveCorrect answer is option 'C'. Can you explain this answer?

Sayansarkar947460 asked   •  22 hours ago

## Charge on the outer sphere is q and the inner sphere is grounded. Then the charge q' on the inner sphere r2 > r1. a)b)c)d)0Correct answer is option 'C'. Can you explain this answer?

The Black Planet. asked   •  yesterday

## The dispersion relation for electromagnetic waves travelling in a plasma is given as w2 = c2k2 + wp2, where c and wp are constants. In this plasma, the group velocity is :a)proportional to but not equal to the phase velocityb)inversely proportional to the phase velocityc)equal to the phase velocityd)a constantCorrect answer is option 'B'. Can you explain this answer?

Bikash Kumar Roy asked   •  yesterday

## Which one of the following circuits is to be selected for doubling the input voltage?a)b)c)d)Correct answer is option 'D'. Can you explain this answer?

VIRANCHI ARVINDBHAI SHAH asked   •  yesterday

## The electrical conductivity of a semi-conductor in cases when electromagnetic radiation of wave length shorter than 2480 nm is incident on it. What is the band - gap Mark -0 .33 out of 1.00 (in eV) for the semiconductor?(take h = 6.67 x10-34 J-s).a)0.5b)0.9c)0.7d)1.1Correct answer is option 'A'. Can you explain this answer?

Betsy Susan Abraham asked   •  yesterday

## Let's assume there are N non interacting and distinguishable particles in a quantum mechanical system. The system is a two level one.Each one of the particle can be present either in a state 0 with energy E(0)=0 or in the sta... more

Dheeraj Bhakat asked   •  2 days ago

## For an n- p- n transistor connected as shown in the figure. VBE = 0.7V. Given that reverse saturation current of the junction at room temperature 300o k is 10-13 A, the emitter current is ______a)b)c)d)Correct answer is option 'A'. Can you explain this answer?

Bharti Sharma asked   •  2 days ago

## Needed a Test for polarisation? Related: Topic wise Tests for IIT JAM Physics?

Pankaj Agarwal asked   •  2 days ago

## The value of the integral   where R is the following solid regiona)2/5b)5/4c)5/12d)5Correct answer is option 'C'. Can you explain this answer?

Abhishek Sulodhia asked   •  2 days ago

## A ring of mass m can slide over a smooth vertical rod. The ring is connected to a spring of force constant k = 4mg/R  where 2R is the natural length of the spring. The other end of the spring is fixed to the ground at a horizontal distance 2R  from the base of the rod. The mass is released at a height of 1.5R from the ground.... more

Shantanu Dutta asked   •  2 days ago

## Needed a Test for charge density and guass theorem? Related: Topic wise Tests for IIT JAM Physics?

Ayushi Singh asked   •  2 days ago

## Let α , β,γ be real numbers such that β ≠ 0 and γ ≠ 0. Supposeand P-1 =P.  Then    a)α = 0 and βγ = 1b)α ≠ 0 and βγ = 1c)α = 0 and βγ = 2d)α = 0 and βγ = -1Correct answer is option 'A'. Can you explain this answer?

Pritam Pattanayak asked   •  2 days ago

## Helmholtz free energy is given as F = U – TS, then which of the relation hold true?Select one:a)b)c)d)Correct answer is option 'D'. Can you explain this answer?

RITU GOEL asked   •  2 days ago

## Gibb’s thermodynamical potential can be represented as G = H – TS (Symbols have their usual meaning) which relation holds true?Select one:a)b)c)d)Correct answer is option 'B'. Can you explain this answer?

SANJEEV JAIN asked   •  2 days ago

## A particle is moving in space with O as the origin. Some possible expressions for its position velocity and acceleration in cylindrical coordinate (p,φ,z) are given below, which of the following are correct?a)Position vector b)velocity vector c)accleration vector d)accleration vector Correct answer is option 'A,B,D'. Can you explain this answer?

Rajat Kumar Sahu asked   •  2 days ago

## 2. Two cars having masses m, and m move in circles of 2 radii r, and r respectively. If they complete the circle 2 in equal time, the ratio of their angular speeds co, ko2 is (a) m, /m2 (b) r1 /r2 (c) m,r, I m,r, (d) 1.?

Apurv Dhyani2 asked   •  2 days ago

## Needed a Document for vector integration? Related: Basic Physics for IIT JAM?

Vishnu A asked   •  2 days ago

## Needed a Video for vtheoruy? Related: Gauss' Law - Electrostatics, Electromagnetic Theory, CSIR-NET Physical Sciences?

Sanskriti Rastogi asked   •  2 days ago

## Which of the following expressions is in the sum-of-products (SOP) form?a)(A + B)(C + D)b) (A)B(CD)c)AB(CD)d)AB + CDCorrect answer is option 'D'. Can you explain this answer?

Pritam Dalal asked   •  2 days ago

## The total energy of an ionic solid is given by   where a is the Madelung constant, r is the distance between the nearest neighbour in the crystal. If r0 is the equilibrium separation then the constant B is given by ______a)b)c)d)Correct answer is option 'A'. Can you explain this answer?

Deepak Singh asked   •  2 days ago

## A photon of frequency u strikes an electron of mass m initially at rest. After scattering at an angle φ, the photon loses half of its energy. If the electron recoils at an angle θ, which of the following is(are) true?... more

Pritam Kumar asked   •  3 days ago

## A rod is moving with a speed of 0.8c in a direction at 60° to its own length. The percentage contraction in the length of the rod is ___________.Correct answer is '9'. Can you explain this answer?

Sukhman Vashisht asked   •  3 days ago

## A body centred cubic lattice has edge a. Edge of its primitive cells will be :a)b)c)d)aCorrect answer is option 'C'. Can you explain this answer?

Malay Krishna Santra asked   •  3 days ago

## Which of the following sets cannot enter into the list of fundamental quantities in any system of units? a.length,mass,velocity b.length,time,velocity C.time,mass,velocity d.length,mass,time?

PARUL PATEL asked   •  3 days ago

## If the electric flux entering and leaving an enclosed surface respectively is   and  the electric charge inside the surface will bea)b)c)d)Correct answer is option 'A'. Can you explain this answer?

Sijo Jose asked   •  3 days ago

## Block of mass  M1 and M2  are connected by a cord which passes over the pulleys P1 and P2 as shown in the figure. If there is no friction, the acceleration of the block of mass M2 will be :a)b)c)d)Correct answer is option 'C'. Can you explain this answer?

Sanjid Km Sanju asked   •  3 days ago

## A person is standing in an elevator. The situation in which he finds his weight less than actual is whena)The elevator moves upward with uniform velocityb)The elevator moves downward with constant accelerationc)The elevator moves downward with uniform velocityd)The elevator moves upward with constant accelerationCorrect answer is option 'B'. Can you explain this answer?

Biki 2000 asked   •  3 days ago

## Two particles of mass m  each are tied at the ends of a light string of length 2a. The whole system is kept on a frictionless horizontal surface with the string held light so that each mass is at a distance a from the centre P (as shown in the figure). Now, the mid point of the string is pulled vertically upwards with a small but constant force F. As a result, the particles move towards each other on the surface. The magnitude of acceleration, when the separation between them becomes 2x, is :... more

Abhas Khandelwal asked   •  3 days ago

## Two blocks A and B of masses  m  and  2m  respectively are held at rest such that the spring is in natural length. Find out the accelerations of blocks A and B respectively just after release (pulley, string and the spring are massless).a)0, 0b)c)d)Correct answer is option 'C'. Can you explain this answer?

Physics Bank asked   •  3 days ago

## Find out the moment of Inertia for semi-circular ring of radius R about the tangential axis.?

Hiba Paliyil asked   •  3 days ago

## Needed a Test for digital electronics? Related: Topic wise Tests for IIT JAM Physics?

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