List of top Questions asked in BCECE

If torque is zero then:

If the momentum of body is increased by $100\%$, then the percentage increase in the kinetic energy will be:

If two soap bubbles of different radii are connected by a tube:

A body is moving along a rough horizontal surface with an initial velocity $6 \,m/s$. If the body comes to rest after travelling a distance $9 \,m$, then the coefficient of sliding friction will be:

A plano-convex lens of refractive index $1.5$ and radius of curvature $30 \,cm $ is silvered at the curved surface. Now, this lens has been used to form the image of an object. At what distance from this lens, an object be placed in order to have a real image of the size of the object?

At the height $80\, m$, an aeroplane is moved with $150\, m / s . A$ bomb is dropped from it, so as to hit a target. At what distance from the target should the bomb be dropped ? $\left(g=10\, m / s ^{2}\right)$

Arrange the following as increase in oxidation number : (i) $Mn ^{2+}$ (ii) $MnO _{2}$ (iii) $KMnO _{4}$ (iv) $K _{2} MnO _{4}$

The standard reduction potential $E^{o}$ for the half reactions are as: $Z n \rightarrow Z n^{2+}+2 e^{-}, E^{o}=0.76\, V$ $C u \rightarrow C u^{2+}+2 e^{-}, E^{o}=0.34\, V$ The emf for the cell reaction: $Z n+C u^{2+} \rightarrow Z n^{2}+C u$

In a triode valve, the plate resistance is $10000\, \Omega$ and the anode load resistance is $30000\, \Omega$. If the amplification factor is $36$ , then the voltage gain is :

$n$ identical spherical drops each of radius $r$ are charged to same potential $V$. They combine to form a bigger drop. The potential of the big drop will be :

Magnetic permeability is maximum for:

Four molecules of a gas have speeds $1,2,3$ and $4\, kms ^{-1}$. The value of rms speed of the gas molecules is :

If the work done in blowing a bubble of volume $V$ is $W$, then the work done in blowing a soap bubble of volume $2\, V$ will be :

A force $F$ is given by $F=a t +b t^{2}$, where $t$ is time. What are the dimensions of $a$ and $b$ respectively ?

A magnetic needle suspended in a vertical plane at $30^{\circ}$ from the magnetic meridian makes an angle $45^{\circ}$ with the horizontal. What will be the true angle of dip ?

A metallic rod of length $l$ is placed normal to the magnetic field $B$ and revolved in a circular path about one of the ends with angular frequency $\omega$. The potential difference across the ends will be :

A rain drop of radius $0.3\, mm$ has a terminal velocity of $1\, m / s$ and the viscosity of $1\, m / s$ and the viscosity of air is $18 \times 10^{-5}$ poise. The viscous force on the drop is:

For a series LCR circuit, the phase difference between current and voltage at the condition of resonance will be :

In hydrogen atom when an electron jumps from second to first orbit, the wavelength of line emitted is :

The current gain of a transistor in common emitter mode is $49 .$ The change in collector current and emitter current corresponding to the change in base current by $5.0\, \mu A$ are :

The wavelength of maximum energy, released during an atomic explosion was $2.93 \times 10^{-10} m$. Given that the Wien's constant is $2.93 \times 10^{-3} m - K$, the maximum temperature attained must be of the order of :

Synthetic polymer which resemble natural rubber is