A tuning fork arrangement (pair) produces 4 beats/sec with one fork of frequency 288 cps. A little wax is placed on the unknown fork and it then produces 2 beats/sec. What is the frequency of the unknown fork?

Anonymous User Physics Waves and Sound Waves 30 Mar, 2020 62 views

Tube A has both ends open while tube B has one end closed, otherwise they are identical. What is the ratio of the fundamental frequency of tube A and B?

Anonymous User Physics Waves and Sound Waves 30 Mar, 2020 59 views

If two tangents drawn from a point P to the parabola y2 = 4x are at right angles, then the locus of P is

Anonymous User Maths Parabola 30 Mar, 2020 107 views

A person is to count 4500 currency notes. Let an denote the number of notes he counts in the nth minute.If a1 =a2 =...=a10 =150 and a10, a11,....arein an A.P. with common difference –2, then the time taken by him to count all notes is

Anonymous User Maths Sequences and Series 30 Mar, 2020 60 views

An urn contains nine balls of which three are red, four are blue and two are green. Three balls are drawn at random without replacement from the urn. The probability that the three balls have different colours is

Anonymous User Maths Probability 30 Mar, 2020 61 views

For two data sets, each of size 5, the variances are given to be 4 and 5 and the corresponding means are given to be 2 and 4, respectively. The variance of the combined data set is

Anonymous User Maths Statistics 30 Mar, 2020 65 views

There are two urns. Urn A has 3 distinct red balls and urn B has 9 distinct blue balls. From each urn two balls are taken out at random and then transferred to the other. The number of ways in which this can be done is

Anonymous User Maths Permutation & Combination 30 Mar, 2020 60 views

In a binomial distribution ,, if the probability of at least one success is greater than or equal to 9/10 , then n is greater than

Anonymous User Maths Probability 30 Mar, 2020 61 views

If the roots of the equation bx2 +cx+a=0 be imaginary, then for all real values of x. The expression

Anonymous User Maths Quadratic Equation 30 Mar, 2020 63 views

The sum to infinity of the series

Anonymous User Maths Sequences and Series 30 Mar, 2020 61 views

One ticket is selected at random from 50 tickets numbered 00, 01, 02, ...., 49. Then the probability that the sum of the digits on the selected ticket is 8, given that the product of these digits is zero, equals

Anonymous User Maths Probability 30 Mar, 2020 64 views

If the mean deviation of number1,1+d,1+2d,...., 1 + 100d from their mean is 255, then the d is equal

Anonymous User Maths Statistics 30 Mar, 2020 61 views

The remainder left out when is devided by 9 is

Anonymous User Maths Binomial Theorem 30 Mar, 2020 62 views

From 6 different novels and3 different dictionaries, 4 novels and 1 dictionary are to be selected and arranged in a row on a shelf so that the dictionary is always in the middle. Then the number of such arrangements is

Anonymous User Maths Permutation & Combination 30 Mar, 2020 62 views

The number of value of x in the interval [0, 3pai] satisfying the equation

Anonymous User Maths Trigonometry 30 Mar, 2020 59 views

In a triangle ABC, let  If r is the inradius and R is the circumradius of the triangle ABC, then 2(r + R) equals

Anonymous User Maths Trigonometry 30 Mar, 2020 60 views

If in a ABC, the altitudes from the vertices A, B, C on opposite sides are in H.P., then sinA, sinB, sinC are in

Anonymous User Maths Trigonometry 30 Mar, 2020 58 views

The sides of a triangle are sina, cosa and and then the greatest angle of tringle is?

Anonymous User Maths Trigonometry 30 Mar, 2020 67 views

If then the difference between the maximum and

minimum values of u2 is given by

Anonymous User Maths Trigonometry 30 Mar, 2020 66 views

Let such that if

then value of

Anonymous User Maths Trigonometry 30 Mar, 2020 62 views

A person standing on the bank of a river observes that the angle of elevation of the top of a tree on the opposite bank of the river is 60o and when he retires 40 meters away from the tree the angle of elevation becomes 30o. The breadth of the river is

Anonymous User Maths Trigonometry 30 Mar, 2020 59 views

The upper 3/4th portion of a vertical pole subtends an angle tan–1(3/5) at a point in the horizontal plane through its foot and at a distance 40 m from the foot. A possible height of the vertical pole is

Anonymous User Maths Trigonometry 30 Mar, 2020 83 views

The number of solution of tanx + secx = 2cosx in [0, 2p) is

Anonymous User Maths Trigonometry 30 Mar, 2020 63 views

The half-life period of a first order chemical reaction is 6.93 minutes. The time required for the completion of 99% of the chemical reaction will be (log 2 = 0.301)

Anonymous User Chemistry Chemical Kinetics 29 Mar, 2020 77 views

One mole of a symmetrical alkene on ozonolysis gives two moles of an aldehyde having a molecular mass of 44 u. The alkene is?

Anonymous User Chemistry Hydrocarbons 29 Mar, 2020 70 views

Solubility product of silver bromide is 5.0 × 10–13. The quantity of potassium bromide (molar mass taken as 120 g mol–1) to be added to 1 litre of 0.05 M solution of silver nitrate to start the precipitation of AgBr is

Anonymous User Chemistry Equilibrium 29 Mar, 2020 77 views

At 25°C, the solubility product of Mg(OH)2 is 1.0 × 10–11. At which pH, will Mg2+ ions start precipitating in the form of Mg(OH)2 from a solution of 0.001 M Mg2+ ions ?

Anonymous User Chemistry Equilibrium 29 Mar, 2020 98 views

A coin is placed on a horizontal platform which undergoes vertical simple harmonic motion of angular frequency w. The amplitude of oscillation is gradually increased. The coin will leave contact with the platform for the first time

Anonymous User Physics Oscillation 29 Mar, 2020 67 views

The maximum velocity of a particle, executing simple harmonic motion with an amplitude 7 mm, is 4.4 m/s. What is the period of oscillation?

Anonymous User Physics Oscillation 29 Mar, 2020 64 views

Starting from the origin, a body oscillates simple harmonically with a period of 2 s. After what time will its kinetic energy by 75% of the total energy?

Anonymous User Physics Oscillation 29 Mar, 2020 61 views

The bob of a simple pendulum is a spherical hollow ball filled with water. A plugged hole near the bottom of the oscillating bob gets suddenly unplugged. During the observation, till water is coming out, the time period of oscillation would

Anonymous User Physics Oscillation 29 Mar, 2020 62 views

If a simple harmonic motion is represented by its time period is

Anonymous User Physics Oscillation 29 Mar, 2020 54 views

The polymer containing strong intermolecular forces e.g., hydrogen bonding is?

Anonymous User Chemistry Polymers 29 Mar, 2020 63 views

29.5 mg of an organic compound containing nitrogen was digested according to Kjeldahl's method and the evolved ammonia was absorbed in 20 mL of 0.1 M HCl solution. The excess of the acid required 15 mL of 0.1 M NaOH solution for complete neutralisation. The percentage of nitrogen in the compound is?

Anonymous User Chemistry 29 Mar, 2020 62 views

Two simple harmonic motions are represented by the equations and . The phase difference of the velocity of particle 1 with respect to the velocity of particle 2 is

Anonymous User Physics Oscillation 29 Mar, 2020 55 views

The functionrepresents

Anonymous User Physics Oscillation 29 Mar, 2020 55 views

In forced oscillation of a particle the amplitude is maximum for a frequency w1 of the force, while the energy is maximum for a frequency w2 of the force, then

Anonymous User Physics Oscillation 29 Mar, 2020 62 views

A particle of mass m is attached to a spring (of spring constant k) and has a natural angular frequency  An external force F(t) proportional tois applied to the oscillator. The time displacement of the oscillator will be proportional to

Anonymous User Physics Oscillation 29 Mar, 2020 55 views

The total energy of a particle, executing simple harmonic motion is :

x /  x2 / independent of x /  x1/2

where x is the displacement from the mean position.

Anonymous User Physics Oscillation 29 Mar, 2020 58 views

A particle at the end of a spring executes simple harmonic motion with a period t1, while the corresponding period for another spring is t2. If the period of oscillation with the two springs in series is T, then

Anonymous User Physics Oscillation 29 Mar, 2020 58 views

The bob of a simple pendulum executes simple harmonic motion in water with a period t, while the period of oscillation of the bob is tin air. Neglecting frictional force of water and given that the density of the bob is (4/3) × 1000 kg/m3. What relationship between t and t0 is true?

Anonymous User Physics Oscillation 29 Mar, 2020 86 views

A body executes simple harmonic motion. The potential energy (P.E.), the kinetic energy (K.E.) and total energy (T.E.) are measured as a function of displacement x. Which of the following statement is true?

Anonymous User Physics Oscillation 29 Mar, 2020 61 views

The length of a simple pendulum executing simple harmonic motion is increased by 21%. Then what will be the percentage increase in the time period of the pendulum of increased length?

Anonymous User Physics Oscillation 29 Mar, 2020 63 views

Two particles A and B of equal masses are suspended from two massless springs of spring constants k1 and k2, respectively. If the maximum velocities, during oscillations, are equal, the ratio of amplitudes of A and B is

Anonymous User Physics Oscillation 29 Mar, 2020 73 views

A child swinging on a swing in sitting position stands up, then the time period of the swing will

increase / decrease / remains same /increases if the child is long and decreases if the child is short.

Anonymous User Physics Oscillation 29 Mar, 2020 62 views

In a simple harmonic oscillator, at the mean position

Anonymous User Physics Oscillation 29 Mar, 2020 61 views

If a spring has time period T, and is cut into n equal parts, then the time period of each part will be

Anonymous User Physics Oscillation 29 Mar, 2020 65 views

In a simple harmonic oscillator, at the mean position

Anonymous User Physics Oscillation 29 Mar, 2020 63 views

If the letters of the word SACHIN are arranged in all possible ways and these words are written out as in dictionary, then the word SACHIN appears at serial number

Anonymous User Maths Permutation & Combination 28 Mar, 2020 60 views