List of top Questions asked in EAMCET- 2006

A p-n-p transistor is said to be in active region of operation, when:

A teacher asked a student to connect N cells each of emf e in series to get a total emf of Ne. While connecting, the student, by mistake, reversed by polarity of n cells. The total emf of the resulting series combination is:

Which of the following can give a Grignard reagent when reacted with magnesium m dry ether?

Acidified $ \text{KMn}{{\text{O}}_{\text{4}}} $ oxidises oxalic acid to $ \text{C}{{\text{O}}_{2}}. $ What is the volume (in litres) of $ {{10}^{-4}}\text{M}\,\text{KMn}{{\text{O}}_{\text{4}}} $ required to completely oxidise 0.5 L of $ {{10}^{-2}}\text{M} $ oxalic acid in acid medium?

How many times more, the mass of the original star is to be larger than that of the sun for the formation of Black Hole?

Match the following lists:

The bond angle in $ \text{As}{{\text{H}}_{\text{3}}} $ is greater than that in:

The electrical potential on the surface of a sphere of radius r due to a charge $ 3\times {{10}^{-6}}C $ is 500 V. The intensity of electric field on the surface of the sphere is $ \left[ \frac{1}{4\pi {{\varepsilon }_{0}}}=9\times {{10}^{9}}N{{m}^{2}}{{C}^{-2}} \right] $ $ (in\text{ }N{{C}^{-1}}) $ :

Two short bar magnets P and Q are arranged such that their centres are on the X-axis and are separated by a large distance. The magnetic axes of P and Q are along X and Y axes respectively. At a point R, midway between their centres, if B is the magnitude of induction due to Q, the magnitude of total induction at R due to the both magnets is:

What is X in the following reaction? $ KHS{{O}_{4}}+{{F}_{2}}\xrightarrow{{}}HF+X $

A particle is moving in a circle of radius r with a constant speed V. The change in velocity after the particle has travelled a distance equal to $ \left( \frac{1}{8} \right) $ of the circumference of the circle is:

What is the conjugate base of $ \text{HSO}_{4}^{-} $ ?

Observe the following reaction : $ A(g)+3B(g)\xrightarrow{{}}2C(g) $ The rate of this reaction $ \left( -\frac{d[A]}{dt} \right) $ is $ 3\times {{10}^{-3}}\,\text{mol}\,{{\text{L}}^{-1}}. $ What is the value of $ -\frac{d[B]}{dt} $ in $ \text{mol}\,{{\text{L}}^{-1}}{{\min }^{-1}}. $ ?

Consider the following reactions : (i) $ Al+NaOH+{{H}_{2}}O\xrightarrow{\Delta } $ (ii) $ {{F}_{2}}+NaOH(conc.)\xrightarrow{{}} $ (iii) $ NaOH+P(white)+{{H}_{2}}O\xrightarrow{{}} $ The correct set of reactions which give gaseous product is

Ethyl alcohol exhibits acidic character on reacting with

$I_S$ and $I_H$ are the moments of inertia about the diameters of a solid and thin walled hollow sphere respectively. If the radii and the masses of the above spheres are equal, $I_H > I_S$. In solid sphere, the mass is continuously and regularly distributed about the centre whereas the mass, to a large extent, is concentrated on the surface of hollow sphere

The effective focal length of the lens combination shown in the figure in - 60 cm. The radii of curvature of the curved surfaces of the Plano-convex lenses are 12 cm each and refractive index of the material of the lens is 1.5. The refractive index of the liquid is:

A light ray in travelling between two media as given below. The angle of incidence on the boundary in all the cases is $30^\circ$. ldentify the correct sequence of increasing order of angles of refraction (1) air to water (2) water to glass (3) glass to water (Refractive indices of glass and water are respectively $\frac{3}{2}$ and $\frac{4}{3}$ )

Four particles, each of mass 1 kg are placed at the comers of a square OABC of side 1 m. O is at the origin of the co-ordinate system. OA and OC are aligned along positive X-axis and positive V-axis respectively. The position vector of the centre of mass is (in m):

In two separate collisions, the coefficients of restitutions $ {{e}_{1}} $ and $ {{e}_{2}} $ are in the ratio 3: 1. In the first collision the relative velocity of approach is twice the relative velocity of separation. Then the ratio between the relative velocity of approach and relative velocity of separation in the second collision is:

A block of wood resting on an inclined plane of angle $ 30{}^\circ $ , just starts moving down. If the coefficients of friction is 0. 2, its velocity (in ms-1) after 5 s is: $ (g=10m{{s}^{-2}}) $

A body of mass 2 kg is projected from the ground with a velocity $ 20m{{s}^{-1}} $ at an angle $ 30{}^\circ $ with the vertical. If $ {{t}_{1}} $ is the time in seconds at which the body is projected and $ {{t}_{2}} $ is the time in seconds at which it reaches the ground, the change in momentum in kg ms-1 during the time $ ({{t}_{2}}{{t}_{1}}) $ is: