List of top Questions asked in BCECE

Instantaneous displacement current of 1.0A in the space between the parallel plates of 1μF capacitor can be established by changing the potential difference of:

What is the r.m.s value of an alternating current which when passed through a resistor produces heat, which is four times that produced by a current of 2A in the same resistor?

In the displacement method of \(l_1\) and \(l_1\) be the sizes of two images, then the size of the object is:

A beaker is a field with water (μ=\(\frac{4}{3}\)) up to a height of 33.25cm. A concave mirror is placed 15 cm above the water level and the image of an object placed at the bottom is formed 25cm below the water level. The focal length of the mirror is nearly :

An air doubble is inside water (μ=\(\frac{4}{3}\)). At what distance from the air bubble should a point object be placed so as to form a real image at the same distance from the dubble? (r is the radius of curvature of the bubble)

An r.m.s voltage of 220 V is applied across a series circuit having a resistance of 100 ohm and an impedance of 22 ohm. the power consumed is:

The resolving power of a telescope is directly proportional to:

The pattern is observed in which experiment?

Young's double slit experiment is first performed in air and then in a medium other than air. It is found that the 9th bright fringe in the medium lies where the 5th dark fringe lies in the air, then the refractive index of the medium is:

The velocity of light in a medium is √3\(\times\)10⁸m/s. The polarizing angle of incidence is:

A 100-W bulb and 4 25-W bulbs are made for the same voltage. They have filaments of the same length and material. The ratio of the diameter of the 100-W bulb to that of the 25-W bulb is:

This compound has both ionic and covalent bonds:

Which one is an amphoteric oxide:

A baby cools from 50°C to 40°C in 5 min. The surrounding temperature is 20°C. In what further time (in minutes) will it cool to 30°C?

A,B and C are voltmeters of resistance R, \(\frac{3}{2}R\) and 3R respectively. When some potential difference is applied between X and Y, the voltmeters readings are V_A, V_B and V_C respectively. Then:

A plane electromagnetic wave of wave interface 10W/m² strikes a small mirror of area 20 cm², held perpendicular to the approaching wave. The radiation force on the mirror will be:

When two mutually perpendicular alternating magnetic field superimposed on each other, the resulting field is:

Work done in turning a magnet of magnetic moment M by an angle of 90? from the mgnetic meridian is n times the corresponding work done to turn through an angle of 60?, where n is

If $A = \begin{bmatrix}1&2&3\\ -1&1&2\\ 1&2&4\end{bmatrix} $ then $\left(A^{2} - 5A\right)A^{-1} = $

The minimum number of geostationary satellites required for uninterrupted global coverage is

Select the output Y of the combination of gates shown in figure for inputs A = 1, B = 0; A = 1, B = 1 and A = 0, B = 0 respectively.

The reason a moving coil galvanometer cannot be used with an alternating current is that

An electron and a proton enter a magnetic field perpendicularly both have same kinetic energy. Which of the following is true?