List of practice Questions

The ease of liquifiaction of noble gases decreases in the order

The eccentric angle of a point on the ellipse $\frac{x^2}{6}+\frac{y^2}{2}=1$ whose distances from the centre of the ellipse is 2, is

The drain cleaner, Drainex contains small bits of aluminium which react with caustic soda to produce dihydrogen. What volume of dihydrogen at 20 ?C and one bar will be released when 0.15 g of aluminium reacts?

The dynamic lift of an aeroplane is based on

The earth moves in an elliptical orbit with the sun S at one of foci as shown in the figure. Its rotational kinetic energy is maximum at the point

The domain of the function $cos^{-1}(2x - 1)$ is

The distance of the point P(a, b, c) from the x-axis is

The distance between the parallel lines $9x^2 - 6xy + y^2 +18x - 6y + 8 = 0$ is

The distance of distinct vision of a person is 50 cm. He wants to read a book place at 25 cm. What should be the focal length of the spectacles?

The distance of the midpoint of the line joining two points $(4, 0)$ and $(0, 4) $ from the centre of circle $ x^2 + r^2 = 16$ is

The displacement of a particle varies with time according to the relation $y = a \,sin\,\omega t + b\, cos \,\omega t$.

The displacement of a progressive wave is represented by $y=A\,sin\left(\omega t-kx\right) $ where $x$ is distance and $t$ is time. The dimensions of $\frac{\omega}{k}$ are same as those of

The dissociation constants of two acids $HA_1$ and $HA_2$ are $3.0\, \times \, 10^{-4}$ and $1.8\, \times \,10^{-5}$ respectively.The relative strengths of the acids will be

The dissolution of $ {Al(OH)_3}$ by a solution of NaOH results in the formation of

The dispersion medium in Gel is

The displacement of a particle from its mean position (in metre) is given by $y=0.2 \, sin (10\pi t+1.5 \pi) cos (10\pi t+1.5 \pi) $ The motion of the particle is

The direction of ray of light incident on a concave mirror is shown by $PQ$ while directions in which the ray would travel after reflection is shown by four rays marked $1, 2, 3$ and $4$. Which of the four rays correctly shows the direction of reflected ray?

The direction of the induced e.m.f. is determined by

The direction cosines l, m, n, of one of the two lines connected by the relations $l -5m+ 3n = 0, 7l^2 + 5m^2 -3n^2 = 0$ are

The direction cosines of a line passing through two points $P(x_1, y_1, z_1)$ and $Q(x_2, y_2, z_2)$ are

The direction of magnetic lines of force of a bar magnet is

The dimensions of the emf of a source of current are that of

The dimensions of ( velocity )$^2$ /radius are the same as that of

The dimerisation of $NO_2$ as the temperature is lowered is accompanied by

The dipole moment of $LiH$ is $1.964 \times 10^{-29}$ cm and the interatomic distance between $Li$ and $H$ in this molecule is $1.596\, ?$. The percentage of ionic character in $LiH$ is