Recent questions and answers in 2005

A man and a women, who do not show any apparent signs of a certain inherited disease, have seven children (2 daughter and 5 sons). Three of the sons suffer from the given disease but none of the daughters are affected. Which of the following mode of inheritance do you suggest for this disease

answered Mar 8, 2020 by samandramshaleza

1 answer

Identify the correctly matched pair -

answered Dec 18, 2019 by dmdipak2001

3 answers

A ball is thrown vertically up ward. It has a speed of 10m/sec when it has reached one half of its maximum height. How high does the ball rise? Take g = $10=m/s^2-$

answered Nov 21, 2019 by meena.clay6

2 answers

Two bodies have their moments of inertia I and 2I respectively about their axis of rotation. If their kinetic energies of rotation are equal, their angular momentum will be in the ratio -

answered Nov 21, 2019 by meena.clay6

1 answer

Two boys are standing at the ends A and B of a ground where AB = a. The boy at B starts. running in a direction perpendicular to AB with velocity v1. The boy at A starts running simultaneously with velocity v and catches the other boy in a time t, where t is -

answered Nov 20, 2019 by meena.clay6

1 answer

The displacement x of a particle varies with time$x=ae^{-\alpha t}+be^{\beta t}$, where $a,b,\alpha$ and $\beta$ are positive constants. The velocity of the particle will -

answered Nov 20, 2019 by meena.clay6

2 answers

Energy levels A, B and C of a certain atom correspond to increasing values of energy i.e. ${E_A}<{E_B}<{E_C}$ . If${\lambda_1},{\lambda_2},{\lambda_3}$ are wave lengths of radiations corresponding to transitions C to B, B to A and C to A respectively, which of the following relations is correct -

answered Nov 20, 2019 by meena.clay6

1 answer

Application of a forward bias to a p-n junction -

answered Nov 20, 2019 by meena.clay6

1 answer

A point source emits sound equally in all directions in a non-absorbind medium. Two ed points P and Q are at distance of 2m and 3m respectively from the source. The ratio of the intensities of the waves at P and Q is -

answered Nov 20, 2019 by meena.clay6

1 answer

If the angle between the vector $\overrightarrow{A} \overrightarrow{B}$ is $\theta$the value of the product $(\overrightarrow B \times \overrightarrow A).\overrightarrow A)$ is equal to -

answered Nov 20, 2019 by meena.clay6

1 answer

Imagine a new planet having the same density as that of earth but it is 3 times bigger than the earth in size. If the acceleration due to gravity on the surface of earth is g and that on the surface of the new planet is g', then -

answered Nov 20, 2019 by meena.clay6

1 answer

If a vector $2\hat{i} + 3\hat{j}+8\hat{k}$ is perpendicular to the vector 4j- 4i + ak , then the value of ?

answered Nov 20, 2019 by meena.clay6

1 answer

Which of the following circular rods, (given radius r and length l) each made of the same energy material and whose ends are maintained at the same temperature will conduct most heat

answered Nov 20, 2019 by meena.clay6

1 answer

Carbon, Silicon and Germanium atoms have four valence electrons each. Their valence and conduction bands are separated by energy band gaps represented by $(E_g){_c}$ $(E_g)_Si$and $(E_g)_Ge$ respectively. Which one of the following relationships is true in their case .

answered Nov 20, 2019 by meena.clay6

1 answer

The total energy of an electron in the first excit state of hydrogen atom is about –3.4eV. Its kinetic energy in this state is-

answered Nov 20, 2019 by meena.clay6

1 answer

The circular motion of a particle with constant speed is-

answered Nov 20, 2019 by meena.clay6

2 answers

Choose the only false statement from the following-

answered Nov 20, 2019 by meena.clay6

1 answer

A stone tied to the end of a string of 1 m long is whirled in a horizontal circle with a constant speed. If the stone makes 22 revolution in 44 seconds, what is the magnitude and direction of acceleration of the stone-

answered Nov 20, 2019 by meena.clay6

2 answers

A drum of radius R and mass M, rolls down without slipping along an inclined plane of angle ?. The frictional force-

answered Nov 20, 2019 by meena.clay6

1 answer

A network of four capacitors of capacity equal to $C_1=C,C_2=2C,C_3=3C,C_4=4C$ are conducted to a battery as shown in the figure. The ratio of the charges on $C_2$ and $C_4$ is

answered Nov 20, 2019 by meena.clay6

1 answer

The angular resolution of a 10cm diameter telescope at a wavelength of 5000Å is of the order of -

answered Nov 20, 2019 by meena.clay6

1 answer

Fission of nuclei is possible because the binding energy per nucleon in them-

answered Nov 20, 2019 by meena.clay6

1 answer