Questions by momin - Jee Neet QnA

in Electronic Devices asked Apr 10 26 views

For an extrinsic semiconductor if doping concentration is increases then.

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in Co-ordinate Geometry asked Feb 4 42 views

A plane passing through the point (3, 1, 1) contains two lines whose direction ratios are 1, – 2, 2 and 2, 3, –1

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in Mathematical Reasoning asked Feb 4 84 views

Which of the following is a tautology ?

Which of the following is a tautology ? (1) $(\sim p)\land(p\lor q)\to q$ (2) $(q\to p)\ \lor\sim(p\to q)$ (3) $(\sim q)\lor(p\land q)\to q$ (4) $(p\to q)\land(q\to p)$

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in Mathematics asked Feb 4 35 views

Let f(x) be a quadratic polynomial such that f(–1) + f(2) = 0. If one of the roots of f(x) = 0 is 3,

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in Co-ordinate Geometry asked Feb 4 49 views

The area (in sq. units) of an equilateral triangle inscribed in the parabola y2 = 8x, with one of its vertices

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in Mathematics asked Feb 4 65 views

Let n > 2 be an integer. Suppose that there are n Metro stations in a city located around a circular path.

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in Mathematics asked Feb 4 26 views

If y = ∑k=1 6 kcos−1{3/5 coskx − 4/5 sinkx} then dy/dx at x = 0 is

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in Vector Algebra asked Feb 4 37 views

Let the position vectors of points 'A' and 'B' be i+j+k and 2i+j+3k, respectively. A point 'P' divides the line

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in Integral Calculus asked Feb 4 45 views

Let [t] denote the greatest integer less than or equal to t. Then the value of ∫12|2x−[3x]| dx is

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in Mathematics asked Feb 4 33 views

For a positive integer n, (1 + 1/x)^n is expanded in increasing powers of x. If three consecutive coefficients

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in Sequences and Series asked Feb 4 55 views

If the variance of the terms in an increasing A.P. b1, b2, b3, ........ , b11 is 90, then the common difference

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in Gravitation asked Feb 1 20 views

What is the depth at which the value of acceleration due to gravity becomes 1/n times the value that at the surface

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in Magnetic Effects of Current and Magnetism asked Feb 1 22 views

A wire of length L metre carrying a current of l ampere is bent in the form of circle. Its magnetic moment is

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in Atoms and Nuclei asked Feb 1 14 views

The total energy of an electron in the nth stationary orbit of the hydrogen atom can be obtained by

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in Physics and Measurement asked Feb 1 92 views

The angle of 1′ (minute of arc) in radian is nearly equal to

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in Dual Nature of Matter and Radiation asked Feb 1 63 views

The de Broglie wavelength of an electron moving with kinetic energy of 144 eV is nearly

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in Rotational Motion asked Feb 1 33 views

Three identical spheres, each of mass M, are placed at the corners of a right angle triangle with mutually perpendicular

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in Electromagnetic Induction and Alternating Currents asked Feb 1 21 views

A light bulb and an inductor coil are connected to an ac source through a key as shown in the figure below.

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in Thermal Properties of Matter asked Feb 1 18 views

Three stars A, B, C have surface temperatures TA, TB, TC respectively. Star A appears bluish, star B appears reddish

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in Properties of Solids and Liquids asked Feb 1 40 views

A liquid does not wet the solid surface if angle of contact is

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in Electrostatics asked Feb 1 81 views

The electric field at a point on the equatorial plane at a distance r from the centre of a dipole having dipole moment p

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in Thermodynamics asked Jan 31 74 views

The efficiency of a Carnot engine depends upon

The efficiency of a Carnot engine depends upon (1) the temperature of the source only (2) the temperature of the sink only (3) the temperatures of the source and sink (4) the volume of the cylinder of the engine

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in Thermodynamics asked Jan 31 131 views

The P-V diagram for an ideal gas in a piston cylinder assembly undergoing a thermodynamic process

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in Properties of Solids and Liquids asked Jan 31 86 views

A barometer is constructed using a liquid (density = 760 kg/m3). What would be the height of the liquid column,

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in Magnetic Effects of Current and Magnetism asked Jan 31 24 views

The magnetic field in a plane electromagnetic wave is given by, By = 2 × 10–7 sin(π × 103x + 3π × 1011t)T

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in Oscillations and Waves asked Jan 31 29 views

The length of the string of a musical instrument is 90 cm and has a fundamental frequency of 120 Hz.

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