Recent questions tagged medium

Which of the following statements are correct?

asked Jul 15, 2014 by balaji.thirumalai

1 answer

An ionic compound has a unit cell consisting of A ions at the corners of a cube and B ions on the centres of the faces. If side length is 10$A^{\large\circ}$, what is the density of the solid assuming atomic weights of A and B as 50 and 100 gms respectively.

asked Jul 15, 2014 by balaji.thirumalai

1 answer

The cubic unit cell of aluminium has an edge length of 405 pm. If its density is 2.7 gcm$^{-3}$, what is the type of unit cell? (Note: Molar mass = 27 g/mol)

asked Jul 15, 2014 by balaji.thirumalai

1 answer

What is the total number of atoms in a cubic based unit cell having one atom on each corner and two atoms on each diagonal?

asked Jul 15, 2014 by balaji.thirumalai

1 answer

In a ccp of mixed oxide, it is found that lattice has $O^{2-}$ ions and one half of the octahedral voids are occupied by trivalent cataions ($X^{3+}$) and one eight of the tetrahedral voids by divalent cataions ($Y^{2+}$). What is the formula of the mixed oxide?

asked Jul 15, 2014 by balaji.thirumalai

1 answer

The equation of trajectory of a projectile is given by $y=x -\large\frac{x^2}{100}$ Find velocity of projection .

asked Jul 15, 2014 by meena.p

1 answer

It is possible to project a particle with a given velocity in two possible ways so as to make it pass through a point at a horizontal distance R from the point of projection .If $H_1$ and $H_2$ are the corresponding maximum height and $H$ is maximum height when the particle is projected at $45^{\circ}$ with the same speed, then what is $H_1+H_2$

asked Jul 15, 2014 by meena.p

1 answer

It is possible to project a particle with a given velocity in two possible ways so as to make it pass through a point at a horizontal distance R from the point of projection . If $t_1$ and $t_2$ are the time taken to reach this point in two possible ways then what is $t_1t_2$?

asked Jul 15, 2014 by meena.p

1 answer

A ball rolls off the top of a stairway with a velocity u. If the height of each step is h, the breadth is b and the ball hits the edge of nth steps, the find the value of n.

asked Jul 15, 2014 by meena.p

1 answer

Which of the following is true about the reaction of Copper and Nitric Acid?

asked Jul 14, 2014 by balaji.thirumalai

1 answer

Arrange the hydrides of the p-Block Group 15 elements in order of increasing boiling point:

asked Jul 14, 2014 by balaji.thirumalai

1 answer

Arrange the hydrides of the p-Block Group 15 elements in order of bond angle:

asked Jul 14, 2014 by balaji.thirumalai

1 answer

Which of the following is not true about Phosphine?

asked Jul 14, 2014 by balaji.thirumalai

1 answer

White phosphorus on reaction with $\text{NaOH}$ gives $\text{PH}_3$ as one of the products. What type of a reaction is this?

asked Jul 14, 2014 by balaji.thirumalai

1 answer

Given the following Assertion and Reason, choose the correct answer:

asked Jul 14, 2014 by balaji.thirumalai

1 answer

Why is it that in the case of nitrogen $\text{NCl}_3$ is possible, but not $\text{NCl}_5$, while in the case of phosphorus, $\text{PCl}_3$ and $\text{PCl}_5$ are possible.

asked Jul 14, 2014 by balaji.thirumalai

1 answer

From a point on the group at a distance 2 meters from the foot of a vertical wall , a ball is thrown at an angle $45^{\circ}$ which just clear the top of the wall and afterwards strikes the ground at a distance 4 m on the other side. The height of the wall is

asked Jul 14, 2014 by meena.p

1 answer

The velocity at the maximum height of a projectile is half of its initial velocity of projection u. Its range on horizontal plane is

asked Jul 14, 2014 by meena.p

1 answer

The velocity of projection of an oblique projectile is $(6i +8j)m/s$ . The horizontal range of projectile is $( g=10 m/s)^2$

asked Jul 14, 2014 by meena.p

1 answer

Estimate the intrinsic conductivity ($\sigma_i$) and resistivity ($\rho_i$) of silicon atoms and electron-hole pairs at room temperature of $300^{\circ}\;K$.

asked Jul 13, 2014 by balaji.thirumalai

1 answer

A semiconductor has an electron concentration of $0.45 \times 10^{22} \; /m^3$ and a hole concentration of $5 \times 10^{20} \;/ m^3$. Find its conductivity.

asked Jul 13, 2014 by balaji.thirumalai

1 answer

Find the equation of a circle with centre $(2,2)$ and passes through the point $(4,5)$.

asked Jul 13, 2014 by thanvigandhi_1

1 answer

Given that logic Gates can be represented as Venn Diagrams, match the following:

asked Jul 13, 2014 by balaji.thirumalai

1 answer

Evaluate the correct Boolean Expression for the given circuit?

asked Jul 13, 2014 by balaji.thirumalai

1 answer

Evaluate the correct Boolean Expression for the given circuit?

asked Jul 13, 2014 by balaji.thirumalai

1 answer

Find the equation of the circle with radius $5$ whose centre lies on x-axis and passes through the point $(2,3)$.

asked Jul 13, 2014 by thanvigandhi_1

1 answer

Find the equation of the circle passing through the points $(2,3)$ and $(–1,1)$ and whose centre is on the line $x–3y–11 = 0$.

asked Jul 13, 2014 by thanvigandhi_1

1 answer

What are the three frequencies of an AM wave represented by the expression: $v = 5(1+0.6\cos 6280 t) \sin 211 \times 10^4 \; \text{volts}$?

asked Jul 13, 2014 by balaji.thirumalai

1 answer

An AM signal is represented by the equation $25+5\sin (2\pi\times 8\times 10^3\;t) \times \sin (2\pi\times 0.25\times10^6\;t)$. Calculate the bandwidth, the modulating factor and the amplitude of each side frequency?

asked Jul 13, 2014 by balaji.thirumalai

1 answer

An AM signal is represented by the equation $10+4\sin (2\pi\times 3\times 10^3\;t) \times \sin (2\pi\times 0.3\times10^6\;t)$. Calculate the bandwidth, the modulating factor and the amplitude of each side frequency?

asked Jul 13, 2014 by balaji.thirumalai

1 answer

Find the equation of the circle passing through the points (4,1) and (6,5) and whose centre is on the line 4x + y = 16

asked Jul 13, 2014 by thanvigandhi_1

1 answer

An AM signal is represented by the equation $15+3\sin (2\pi\times 5\times 10^3\;t) \times \sin (2\pi\times 0.5\times10^6\;t)$. What is the amplitude of each side frequency?

asked Jul 12, 2014 by balaji.thirumalai

1 answer

When 80% AM is transmitted total power is 10kW. What is the power saved if the carrier and one side band are suppressed?

asked Jul 12, 2014 by balaji.thirumalai

1 answer

The velocity v of a particle at time t is given by $v=a+ bt+\large\frac{c}{t+d}$ where a, b, c and d are constants. The dimensions of a, b c and d are respectively

asked Jul 11, 2014 by balaji.thirumalai

1 answer

Which of the following is a good predictor of a period $\text{t}$ of a swinging pendulum based on the factors such as Length (l), Angle ($\theta$), the mass (m) and acceleration due to gravity (g)?

asked Jul 11, 2014 by balaji.thirumalai

1 answer

$x^2+ y^2– 4x–8y–45=0$ find the centre and radius of the circles.

asked Jul 11, 2014 by thanvigandhi_1

1 answer

Find the equation of the circle with centre $ \bigg( \large\frac{1}{2}$$, \large\frac{1}{4} \bigg)$ and radius $ \large\frac{1}{12}$

asked Jul 11, 2014 by thanvigandhi_1

1 answer

The hypotenuse of a right angled triangle has its ends at the points (1, 3) and (– 4, 1). Find an equation of the legs (perpendicular sides) of the triangle.

asked Jul 11, 2014 by thanvigandhi_1

1 answer

The time period of a sample pendulum is to be determined with the help of a stop clock having a least count of $ \large\frac{1}{3}$ seconds. If the estimated time period is about 2 second time for how many oscillations must be recorded so that the periodic time is determined with an error less than $0.67%$

asked Jul 10, 2014 by meena.p

1 answer

Match the question given under Column $C_1$ with their appropriate answer given under the Column $C_2$ for the following : The value of the $ \lambda$, if the lines $(2x + 3y + 4) +\lambda (6x – y + 12) = 0 $ are

asked Jul 9, 2014 by thanvigandhi_1

1 answer

State whether the following is true or false and justify : Line joining the points (3, – 4) and (– 2, 6) is perpendicular to the line joining the points (–3, 6) and (9, –18).

asked Jul 9, 2014 by thanvigandhi_1

1 answer

Calculate the mean deviation about the mean of the set of first n natural numbers where numbers where n is an even number.

asked Jul 9, 2014 by meena.p

1 answer

Calculate the mean deviation about the mean of the set of first n natural numbers when n is odd number.

asked Jul 9, 2014 by meena.p

1 answer

Prove that $\tan^{-1}{\frac{1}{4}}+\tan^{-1}{\frac{2}{9}}=\sin^{-1}{\frac{1}{\sqrt 5}}$

asked Jul 9, 2014 by balaji.thirumalai

1 answer

Prove that \[ 2sin^{-1} \frac{3}{5} = tan^{-1} \frac{24}{7} \]

asked Jul 9, 2014 by balaji.thirumalai

1 answer

Find the standard deviation of the first n natural numbers.

asked Jul 9, 2014 by meena.p

1 answer

True-or-False : If A and B are two candidates seeking admission in an engineering college.The probability that A is selected is 0.5 and the probability that both A and B are selected is at most 0.3.Is it possible that the probability of B getting selected is 0.7?

asked Jul 9, 2014 by sreemathi.v

1 answer

The probability that at least one of the events A and B occurs is 0.6.If A and B occur simultaneously with probability 0.2.Then $P(\bar{A})+P(\bar{B})$ is

asked Jul 9, 2014 by sreemathi.v

1 answer

The standard deviation of some temperature data in $^{\circ} C$ is 5. If the data were converted into $^{\circ} F$ the variance would be

asked Jul 9, 2014 by meena.p

1 answer

6 boys and 6 girls sit in a row at random.The probability that all the girls sit together is

asked Jul 9, 2014 by sreemathi.v

1 answer

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