List of top Questions asked in BCECE

Which is not found in bacteriophage?

Photoautotrophic bacteria have

An open U-tube contains mercury. When $11.2 \,cm$ of water is poured into one of the arms of the tube, how high does the mercury rise in the other arm form its initial level?

The stability of ferric ion is due to:

A cyclic hydrocarbon molecule has all the carbon and hydrogen is a single plane. All the carbon-carbon bonds are of same length, less than $ 1.54\,?? but more than $ 1.34 \,?? $ The C-C bond angle will be:

Which reagent can convert acetic acid into ethanol ?

When $ C{{H}_{3}}COOH $ reacts with $ C{{H}_{3}}-MgX: $

Acetals are

The escape velocity of a projectile on the earths surface is $ 11.2\,\,km{{s}^{-1}} $ . A body is projected out with thrice this speed. The speed of the body far away from the earth will be:

The magnetic field amplitude of an electromagnetic wave is $ 2\times {{10}^{-7}}T $ , Its electric field amplitude, if the wave is travelling in free space is:

A can is moving horizontally along a straight line with constant speed $30\, m/s$. A projectile is to be fired from the moving cart in such a way that it will return to the cart after the cart has moved $80 \,m$. At what speed (relative to the can) must the projectile be fired? (Takes $ =10\,m/{{s}^{2}} $ )

In the given figure the pulley is assumed massless and frictionless. If the friction force on the object of mass m is $ f $ , then its acceleration in terms of the force $F$ will be equal to:

In the first second of its flight, rocket ejects 1/60 of its mass with a velocity of $ 2400\,\,m{{s}^{-1}} $ . The acceleration of the rocket is:

A body starts from rest with an uniform acceleration. If its velocity after $n$ seconds is $v$, then its displacement in the last $2\,s$ is

A ball of mass m moves with speed $v$ and it strikes normally with a wall and reflected back normally. If its time of contact with wall is $t$, then find force exerted by ball on the wall.

The maximum velocity of a simple harmonic motion represented by $ y=3\sin \left( 100\,t+\frac{\pi }{6} \right)m $ is given by:

Consider the following statements : The total energy of a particle executing simple harmonic motion depends on its : (I) amplitude (II) period (III) displacement Of these statements :

The exposure time of a camera lens at $ f/2.8 $ setting is $1/200$ s. The correct exposure time at $ f/5.6 $ setting is:

The fundamental frequency of a sonometer wire is n. If its radius is doubled and its tension becomes half, the material of the wire remains same, the new fundamental frequency will be:

If linear density of a rod of length 3 m varies as $ \lambda =2+x, $ then the position of the centre of gravity of the rod is:

A block of mass $m$ initially at rest is dropped from a height $h$ on to a spring of force constant $k$. The maximum compression in the spring is $x$ then:

A particle is moving in a circle of radius R with constant speed v. If radius is doubled, then its centripetal force to keep the same speed gets:

The dimensional formula for the gravitational constant is:

When earth moves round the sun, the quantity which remains constant is:

A particle moves along Y-axis in such a way that its y-coordinate varies with time $t$ according to the relation $y = 3 +5t + 7t ^2$. The initial velocity and acceleration of the particle are respectively