Ayush Raj Raj answered • 13 hours ago

Which given pattern

Pallavi Khotele asked • 7 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?

Shraddha Wadighare asked • 8 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?

Deepak Singh asked • 9 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 allowed
- b)Both (1) and (2) are forbidden
- c)(1) is forbidden and (2) is allowed
- d)(1) is allowed and (2) is forbidden

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

Nikhil Shukla asked • 13 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?

JYOTI AGARWAL asked • 15 hours ago

- a)Rate of conversion from electrical to chemical energy is 48W in device E.
- b)Emf of the device is 48V.
- c)Potential difference across AB is 48V.
- d)Point B is connected to the positive terminal of E.

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

RAKESH CHANDRAKANT SURA asked • 15 hours ago

Consider a resistor of uniform cross sectional area connected to a battery of zero internal resistance. If the length of the resistor is doubled by stretching it then :

- a)current will become four times.
- b)the thermal power produced by the resistor will become one fourth.
- c)the electric field in the wire will become half.
- d)the product of the current density and conductance will become half.

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

NAMRATA AGRAWAL asked • 15 hours ago

In the circuit shown in the figure

- a)potential difference across 4Ω resistance is equal to the potential difference across 6Ω resistance
- b)current flowing in the circuit is 5A
- c)current in wire AB is zero
- d)power supplied by the battery is 200 watt

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

Pradeep Pal asked • 16 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

हिंदुस्तान ज़िंदाबाद asked • 16 hours ago

A conductor of truncated conical (frustum) is connected to a battery of emf ∈ as shown in the figure.

If at a section distance *x * from left end, electric field intensity, potential and rate of generation of heat per unit length are *E*, *V* and *H * respectively, then which of the following graphs(s) is/are correct?

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

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

RITA AGARWAL asked • 16 hours ago

Two cells of unequal emfs *E*_{1} and *E*_{2} and internal resistances *r*_{1} and *r*_{2} are joined as shown in figure. *V*_{P} and *V*_{Q} are the potential at *P* and **Q** respectively.

- a)The potential difference across both the cell will be equal
- b)
- c)The potential difference across one of the cells will be greater than its emf.
- d)One of the cell, will supply energy to the other cell.

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

Chandna Arora asked • 16 hours ago

In the figure a conductor of non-uniform cross-section is shown. *A* steady current *I* flows in it.

- a)The electric field at B is more than at A.
- b)The thermal power generated at B is more than at A in an element of small width.
- c)The electric field at A is more than at B.
- d)The thermal power generated at A is more than at B in an element of small width.

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

Devesh Sharma asked • 16 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?

Deep Thinker asked • 17 hours ago

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?

Rupam Patra asked • 19 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?

JAYESH KUMAR LABHU asked • 20 hours ago

A point charge **q** is located in vacuum at a distance **l** from the plane surface of a uniform isotropic dielectric filling up all the half space. If the permittivity of the dielectric equal to ∈. Then the surface density of bound charges.

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

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

Rameshwar Gore asked • yesterday

Let u_{1}, ... u_{n }be a linearly dependent set of functions on a ≤ x ≤ b, and let each function be(n – 1) times differentiable in (a, b). Then

- a)W ronskian of the set functions is identically not zero
- b)Wronskian of the set of functions is greater than to zero
- c)Wronskian of the set of functions is less than to zero
- d)W ronskian of the set of functions is identically zero

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

Jona Khansu asked • yesterday

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?

Chandra Chana asked • yesterday

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?

RITU SINGLA asked • yesterday

In the figure shown the potential energy **U** of a particle is plotted against its position **x** from origin. Then which of the following statement is incorrect.

- a)x
_{3}is in stable equilibrium - b)x
_{2}is in unstable equilibrium - c)x
_{1}is in stable equilibrium - d)x
_{2}is in stable equilibrium

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

RANJIT KAUR asked • yesterday

For a particle moving on a straight line the variation of acceleration with time is given by the graph as shown initially the particle was at rest. Then the corresponding kinetic energy of the particle versus time graph will be :

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

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

ANAMICA GARG asked • yesterday

A block of mass 2*kg* is hanging over a smooth and light pulley through a light string. The other end of the string is pulled by a constant force **F** = 40*N*. The kinetic energy of the particle increase 40*J* in a given interval of time. Then : (**g** = 10*m*/*s*^{2})

- a)tension in the string is 40N
- b)displacement of the block in the given interval of time is 2m
- c)work done by gravity is –20J
- d)work done by tension is 80J

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

NEELIMA AGRAWAL asked • yesterday

One end of an unstretched vertical spring is attached to the ceiling and an object attached to the other end is slowly lowered to its equilibrium position. If **S** be gain in spring energy and **G** be loss in gravitational potential energy in the process, then which of the following is false.

- a)S = 2G
- b)S = G
- c)S = 3G
- d)G = 2S

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

The Real Nature asked • yesterday

A man is standing on a spring balance platform. Reading of balance is 60 kg wt. If the man jumps outside the platform, then the reading of the balance :

- a)Becomes < 60 kg-wt first and then decreases to zero
- b)Becomes > 60 kg-wt initially and then decreases to zero
- c)Decreases to zero
- d)Becomes = 60 kg-wt first and then decrease to zero

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

Shivani Sharma asked • yesterday

Consider the function f (x, y) = x^{3} − 3xy^{2}, 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?

SEEMA GUPTA asked • yesterday

A spherical charged conductor has surface density σ of charge. The electric field on its surface is **E**. If the radius of the sphere is doubled keeping the surface density of charged unchanged then the electric field on the surface of the new sphere will be

- a)4E
- b)E/4
- c)E
- d)E/2

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

Jagadeesh Pidugu asked • yesterday

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?

Dheeraj Bhakat asked • 2 days ago

For an n- p- n transistor connected as shown in the figure. V_{BE} = 0.7V. Given that reverse saturation current of the junction at room temperature 300^{o} k is 10^{-13} A, the emitter current is ______

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

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

Vikram Bhatia asked • 2 days ago

Which of the following mapping is not linear ?

- a)F : R
^{2}→ R^{2}; F(x, y) = (x + y, x) - b)F : R
^{2}→ R^{3}; F(x, y) = (x + 3, 2y, x + y) - c)F : R
^{3}→ R^{3}; F(x, y, z) = (x + 2y – z, y + z, x + y – 2z) - d)F : R
^{2}→ R^{2}; F(x, y) = (x – y, x – 2y)

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

Chandna Arora asked • 2 days ago

A block of mass 1 kg is initially held at rest on the frictionless surface of a wedge of mass 10 kg. The wedge itself lies on horizontal frictionless surface. The block is now released so that it is allowed to slide down the slope. How far down the slope does the block move when the wedge has moved a distance of 20 cm?

- a)10 cm
- b)20 cm
- c)40 cm
- d)0 cm

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

ARTI BHARGAVA asked • 2 days ago

pure silicon at 300**K** has equal electrons concentrations **(n**_{e}) and hole concentration (n_{h}) of 1.5 x 10^{16} m^{-3} . Doping by sodium increases n_{h }to 4.5 x 10^{22} m^{-3} . Then n_{e} in the doped silicon is :

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

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

Chandna Arora asked • 2 days ago

Two satellites S_{1}, and S_{2} revolve round a planet in coplanar circular orbit in the same sense. Their periods of revolutions are 1 hour and 8 hour respectively. The radius of the orbit of S_{1}, = 10^{4} km. When S_{2} is closest to S_{1} then the angular speed of S_{2} as obseived by an astronaut in S_{1}.

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

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

Layana 1605 asked • 2 days ago

Let b be an n × 1 (column) vector and A be an n × n positive definite matrix. Define P : R^{n} → R by

Here t stands for transpose. If x_{0} is a vector such that Ax_{0} = B then which of the following is true? (where t is used for transpose)

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

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

Mukul Wadhwa asked • 2 days ago

The curve represents the distribution of potential along the straight line joining. The two charge Q_{1} and Q_{2} (separated by a distance r) then which of the following statement is correct?

- a)2 and 3
- b)1, 2 and 3
- c)1 and 2
- d)1 and 3

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

Vrushabh Kshirsagar asked • 2 days ago

Let 0 < a < 1 and let <xn> satisfy the condition |x_{n+1} – x_{n}| ≤ a_{n} for n ∈ N then which of the following statements are TRUE ?

- a)<x
_{n}> is convergent - b)<x
_{n}> is cauchy - c)<x
_{n}> is bounded - d)<x
_{n}> is not cauchy

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

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