The potential difference between point *A* and *B* is :

- a)
- b)0
- c)
- d)

Correct answer is option 'B'. Can you explain this answer?

Lopita Biswal answered • 2 days ago

R(eq)1 = 16

R(eq)2= 8

Net R(eq)= 16×8/16+8 = 16/3

R1 and R2 are parallel

so, V1=V2 =10

V = IR

I (1) = 10/16 A

I(2) = 10/8 A

Va +4×10/8 -8×10/16 =Vb

Va-Vb = 0

R(eq)2= 8

Net R(eq)= 16×8/16+8 = 16/3

R1 and R2 are parallel

so, V1=V2 =10

V = IR

I (1) = 10/16 A

I(2) = 10/8 A

Va +4×10/8 -8×10/16 =Vb

Va-Vb = 0

Devesh Sharma asked • 2 hours ago

An anti- reflection film coating of thickness 0.1µm is to be deposited on a glass plate for normal incidence of light of wavelength 0.5µm. What should be the refractive index of the film? (Specify your answer to two digits after the decimal point.)

Correct answer is '1.25'. Can you explain this answer?

Anita Nagar asked • 2 hours ago

Consider Rydberg (Hydrogen-like) atoms in a highly excited state with n around 300. The wavelength of radiation coming out of these atoms for transitions to the adjacent states lies in the range:

- a)Gamma rays (λ ~ pm)
- b)UV (λ ~ nm)
- c)Infrared (λ ~ mm)
- d)RF (λ ~ m)

Correct answer is option 'D'. Can you explain this answer?

VEENA MODANI asked • 7 hours ago

A spherical condenser has inner and outer sphere of radii **a** and **b** respectively. The space between the two is filled with air. The difference between the capacities of two condensers formed when outer sphere is earthed and when inner sphere is earthed will be

- a)0
- b)
- c)
- d)

Correct answer is option 'D'. Can you explain this answer?

PRAMILA SHARMA asked • 7 hours ago

Consider two concentric conducting spherical shell with inner and outer radii **a****, ***b*, *c* and **d** as shown in the figure. Both the shell are given **Q** amount of positive charges. The electric field in different regions are

- a)
- b)
- c)
- d)

Correct answer is option 'D'. Can you explain this answer?

Unni Vinod asked • 7 hours ago

The dispersion relation for electromagnetic waves travelling in a plasma is given as w^{2} = c^{2}k^{2} + w_{p}^{2}, where c and w_{p} are constants. In this plasma, the group velocity is :

- a)proportional to but not equal to the phase velocity
- b)inversely proportional to the phase velocity
- c)equal to the phase velocity
- d)a constant

Correct answer is option 'B'. Can you explain this answer?

Ritikrishna Padhi asked • 8 hours ago

Saurabh Singh asked • 10 hours ago

Let C be the rectangle in R^{3 }with vertices (0, 0, 0), (1, 0, 0), (1, 1, 1) and (0, 1, 1), oriented in the given order by using stoke’s theorem the value of the following integral

correct upto three decimal is ____

Correct answer is '0.667'. Can you explain this answer?

Shraddha Wadighare asked • 10 hours ago

In a colony all families have at least one child. The probability that a randomly chosen family from this colony has exactly k children is (0.5)^{k} ; k = 1, 2,K . A child is either a male or a female with equal probability. The probability that such a family consists of at least one male child and at least one female child is _________

Correct answer is '0.3 to 0.4'. Can you explain this answer?

YOGESH SHARMA asked • 18 hours ago

A satellite of mass **m** revolves around the earth of radius **R** at a height **x** from its surface. If **g **is the acceleration due to gravity on the surface of the earth, the orbital speed of the satellite is :

- a)
- b)
- c)gx
- d)

Correct answer is option 'D'. Can you explain this answer?

Nikhil Shukla asked • 21 hours ago

The rigid uniform horizontal wire PQ of mass M, pivoted at P, carries a constant current I. It rotates with a constant angular speed in a uniform vertical magnetic field B. If the current were switched off, the angular acceleration of the wire, in terms of B, M and I would be

- a)0
- b)2BI/3M
- c)3BI/2M
- d)BI/M

Correct answer is option 'C'. Can you explain this answer?

Pallavi Khotele asked • 21 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 E_{1} is

- a)
- b)
- c)
- d)

Correct answer is option 'C'. Can you explain this answer?

Rupam Patra asked • 23 hours ago

A waiter believes that his tips from various customers have a slightly right skewed distribution with a mean of 10 dollars and a standard deviation of 2.50 dollars. What is the probability that the average of 35 customers will be more than 13 dollars?

Correct answer is '0'. Can you explain this answer?

Deep Thinker asked • yesterday

An ideal gas expands isothermally from a volume V_{1} to V_{2} and then compressed to original volumes V_{1} adiabatically. Initial pressure is p_{1} and final pressure is p_{3. }The total work done is W. Then,

Select one:

Select one:

- a)p
_{2}= p_{1}, W = 0 - b)p
_{2}> p_{1, W < 0} - c)p
_{2}< p_{1, W < 0} - d)p
_{2}> p_{1, W > 0}

Correct answer is option 'B'. Can you explain this answer?

Shani Saleem asked • yesterday

Electric charge is uniformly distributed along a long straight wire of radius 1*mm*. The charge per cm length of the wire is **Q** coulomb. Another cylindrical surface of radius 50*cm* and length 1*m* symmetrically encloses the wire as shown in figure. The total electric flux passing through the cylinder surface is

- a)
- b)
- c)
- d)

Correct answer is option 'A'. Can you explain this answer?

Bibhuti B. Behera asked • yesterday

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 m
- b)6 m
- c)4 m
- d)2 m

Correct answer is option 'B'. Can you explain this answer?

Narendra Nari asked • yesterday

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)4
- c)3
- d)5

Correct answer is option 'C'. Can you explain this answer?

LATA SHARMA asked • yesterday

A battery of internal resistance 2Ω is connected to a variable resistor whose value can vary from 4Ω to 10Ω. The resistance is initially set at 4Ω. If the resistance is now increased then, which of the statement is not correct.

- a)power consumed by it may increase or may decrease
- b)power consumed by it will decrease
- c)power consumed will first increase then decrease.
- d)power consumed by it will increase

Correct answer is option 'A,C,D'. Can you explain this answer?

SHEELU AGRAWAL asked • 2 days ago

At top of a mountain, a thermometer reads 7°C and a barometer reads 70cm, of Hg. At the bottom of the mountain, these read 27°C and 76cm of Hg respectively.

Comparison of density of air at the top with that of bottom is.

Select one:

Comparison of density of air at the top with that of bottom is.

Select one:

- a)75/76
- b)70/76
- c)76/75
- d)76/70

Correct answer is option 'A'. Can you explain this answer?

BHARTI SHAKYA asked • 2 days ago

The value of the line integral where, *C* is the boundary of the region lying between the squares with vertices (1, 1), (–1, 1), (–1, –1) and (1, –1) and (2, 2), (–2, 2), (–2, –2) and (2, -2) will be :

- a)-7(e
^{2}- e) - b)7(e
^{2}- e) - c)-28(e
^{2}- e) - d)28(e
^{2}- e)

Correct answer is option 'C'. Can you explain this answer?

VIRANCHI ARVINDBHAI SHAH asked • 2 days ago

If the plane wave is split & recombined on a screen after the two portions, which are polarized in the x & y directions, have travelled an optical path difference of 2π/k the observed average intensity will be proportional to :

- a)
- b)
- c)
- d)

Correct answer is option 'B'. Can you explain this answer?

Jona Khansu asked • 2 days ago

A pn junction was formed with a heavily doped (10^{18}cm^{-3}) p-region and lightly doped (10^{14} cm^{-3}) n-region. Which of the following statement(s) is(are) correct?

- a)The width of the depletion layer will be more in the n-side of the junction.
- b)The width of the depletion layer will be more in the p-side of the junction.
- c)The width of the depletion layer will be same on both sides of the junction.
- d)If the pn junction is reverse biased, then the width of the depletion region increases.

Correct answer is option 'A,D'. Can you explain this answer?

Chandna Arora asked • 2 days ago

Two block of masses **m**_{1} and **m**_{2} are connected with a massless unstretched spring and placed over a plank moving with an acceleration **a** as shown in figure. The coefficient of friction between the blocks and platform is µ. Choose the correct statements :

- a)spring will be stretched if a < μg
- b)spring will neither be compressed nor be stretched for a ≤ μg
- c)spring will be stretched if a > μg
- d)spring will be compressed if a ≤ μg

Correct answer is option 'A,B,C'. Can you explain this answer?

Anita Nagar asked • 2 days ago

KCl has the NaCl type structure which is fcc with two- atom basis, one at (0, 0, 0) and the other at Assume that the atomic form factors of K+ and Cl– are identical. In an X- ray diffraction experiment on KCl, which of the following (h k l) peaks will be observed?

- a)(1 0 0)
- b)(1 1 0)
- c)(1 1 1)
- d)(2 0 0)

Correct answer is option 'D'. Can you explain this answer?

Balagopal Marar asked • 2 days ago

A weight **w** is to be moved from the bottom to the top of an inclined plane of inclination *θ* to the horizontal. If a smaller force is to be applied to drag it along the plane is comparison to lift it vertically up, the coefficient of friction should be such that :

- a)
- b)
- c)
- d)

Correct answer is option 'C'. Can you explain this answer?

Pooja Maurya asked • 2 days ago

A bead of mass **m** is located on a parabolic wire with its axis vertical and vertex directed towards downwards as in figure and whose equation is **x**^{2} = **ay**. If the coefficient of friction is **μ** the highest distance above the *x*-axis at which the particle will be in equilibrium is :

- a)0.25
*μ*^{2}*a* - b)
*μ*^{2}*a* - c)
*μa* - d)0.5
*μa*

Correct answer is option 'A'. Can you explain this answer?

Sumoksha Parhi asked • 2 days 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√2
- b)√3/2
- c)1/√2
- d)1/√3

Correct answer is option 'C'. Can you explain this answer?

Deepak Sethi asked • 2 days ago

A train passes through a station with a constant speed. A stationary observer at the station platformmeasures the tone of the train whistle as 484 Hz when it approaches the station and 442 Hz when itleaves the station. If the sound velocity in air is 330 m/s, then the tone of the whistle and the speedof the train are

- a)462 Hz, 54 km/h.
- b)463 Hz, 52 km/h.
- c)463 Hz, 56 km/h.
- d)464 Hz, 52 km/h.

Correct answer is option 'A'. Can you explain this answer?

Aditi Choudhury asked • 2 days ago

Let S be the surface in R^{3} defined by the parametric equation

r = 2 + cos t + cos u

θ = t 0 ≤ t ≤ 2π

z = sin u 0 ≤ u ≤ 2π

then the using the divergence theorem what is the volume of the region inside S.

- a)4π
^{2} - b)-4π
^{2} - c)4π
- d)-4π

Correct answer is option 'A'. Can you explain this answer?

Chesta Pahuja asked • 2 days ago

Let X_{1},...,X_{n} be a random sample from a N (0, σ^{2}) population, σ > 0. Which of the following testing problems has (have) the region as the most

powerful critical region of level α ?

powerful critical region of level α ?

- a)H
_{0}: σ^{2}= 1 against H_{1}: σ^{2}= 2 - b)H
_{0}: σ^{2}= 1 against H_{1}: σ^{2}= 4 - c)H
_{0}: σ^{2}= 2 against H_{1}: σ^{2}= 1 - d)H
_{0}: σ^{2}= 1 against H_{1}: σ^{2}= 0.5

Correct answer is option 'A,B'. Can you explain this answer?

Chandra Chana asked • 2 days ago

The wavelength of the L_{α} x- rays spectral line of platinum (atomic number 78) is 1.321 Å. An unknown substance units L_{α} x- rays of wavelength 4.174 Å. Calculate the atomic number of the unknown substance. Given b = 7.4 for La line ?

Correct answer is '47'. Can you explain this answer?

Deepak Singh asked • 2 days ago

For an atomic nucleus with atomic number Z and mass number A, which of the following is (are) correct ?

- a)Nuclear matter and nuclear charge are distributed identically in the nuclear volume.
- b)Nuclei with Z > 83 and A > 209 emit
*α*- radiation. - c)The surface contribution to the binding energy is proportional to A
^{2/3}. - d)β- decay occurs when the proton to neutron ratio is large, but not when it is small.

Correct answer is option 'B,C'. Can you explain this answer?

Sarvesh Suresh asked • 2 days ago

Let {x_{n} }n __>__ 1 be a sequence of positive real numbers. Which one of the following statements is always TRUE?

- a)If {x
_{n}}n__>__1 is a convergent sequence, then {x_{n}}n__>__1 is monotone - b)If is a convergent sequence, then the sequence {x
_{n}}n__>__1 does not converge - c)If the sequence converges to 0, then the series is convergent
- d)If {x
_{n}}n__>__1 is a convergent sequence, then is also a convergent sequence

Correct answer is option 'D'. Can you explain this answer?

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